1-lcindGx reg

SDMS DocID 000005357

April 4 1997

Ms Sheila Eckman United States Environmental Protection Agency 90 Canal Street Boston MA 02114

Re SRSNE Site NTCRA 1 Demonstration of Compliance Report 20

Dear Ms Eckman

Enclosed please find Demonstration of Compliance Report 20 for the SRSNE Site Based on the monitoring data presented in the report the performance standards specified in the Demonstration of Compliance Plan were achieved during the period from March 1 through 31 1997

If you should have any questions regarding the report please contact me

Sincerely landex of New Engla d Inc

srald (H Cresap J E Project_Manager

bullJ enclosure

cc wenc John Rudisill Avery Dennison Gus Moody James River Corporation Bruce Thompson de maximis inc Dan Kogut Aaron Environmental Specialists Mike Gafell Balsland Bouck amp Lee Inc

398 Cedar Hill Street Marlborough MA 01752 bull (508) 481-5750 bull FAX (508) 481-5159

Report

Non-Time-Critical Removal Action No 1 Demonstration of Compliance Report 20

March 1 through March 31 1997

Solvents Recovery Service of New England Inc

Superfund Site Southington Connecticut

Prepared for SRSNE PRP Group

March 1997

HANDEX OF NEW ENGLAND INC 398 Cedar Hill Street

Marlboro Massachusetts 01752 (508) 481 -5750

RPR 03 97 08=22 FR JANES R1UER ENU-ENG 804J649 4369 TO 915084815159_

NOH-TNItCWTieU KMttLlaquoenol HO 1 INMOIta COVnUNHCWTAND TMUBMCMT OTrrCM

DHMOMTIUmON OF COMMJMCE MMRT M

I MOOWEMr OEMia OF MEW CMLAND INC bullUKIWMDMTC

oim legion miMcmc IT

laquo Hun n 1M7

ReSDondent Certification

I certify to the best of nay knowledge and professional judgement and after appropriate inquiries of all relevant persons involved in the preparation of this Deliverable that all guidance documents specified in Attachment 1 of the SOW which relates to this Deliverable were reviewed in preparation of this Deliverable I further certify that the contents of this Deliverable comply with the requirements of the SOW Attachment 1 thereto and all guidance documents specified in Attachment 1 which relate to this Deliverable I am aware that EPA may assess stipulated penalties for submission of a Deliverable that is not in compliance with the requirements of the SOW Attachment 1 thereto and all guidance documents specified in Attachment 1 to the SOW which relates to this Deliverable

Date A J JMroocr )oaySRSNE Kffitampajrfrp ect Coordinator

^NJ

JAMES RIVER CORPORATION FAX MEMO TO DATE

FAX NO NO PAGES

FROM TOTAL P03

APR 02 97 1335 PflGE03

TOTAL PAGE01

MESSAGE

Report

Non-Time-Critical Removal Action No 1 Demonstration of Compliance Report 20

March 1 through March 31 1997

Solvents Recovery Service of New England Inc

Superfund Site Southington Connecticut

Prepared for SRSNE PRP Group

March 1997

HANDEX OF NEW ENGLAND INC 398 Cedar Hill Street

Marlboro Massachusetts 01752 (508) 481 -5750

RPR 03 97 08=22 FR JANES R1UER ENU-ENG 804J649 4369 TO 915084815159_

NOH-TNItCWTieU KMttLlaquoenol HO 1 INMOIta COVnUNHCWTAND TMUBMCMT OTrrCM

DHMOMTIUmON OF COMMJMCE MMRT M

I MOOWEMr OEMia OF MEW CMLAND INC bullUKIWMDMTC

oim legion miMcmc IT

laquo Hun n 1M7

ReSDondent Certification

I certify to the best of nay knowledge and professional judgement and after appropriate inquiries of all relevant persons involved in the preparation of this Deliverable that all guidance documents specified in Attachment 1 of the SOW which relates to this Deliverable were reviewed in preparation of this Deliverable I further certify that the contents of this Deliverable comply with the requirements of the SOW Attachment 1 thereto and all guidance documents specified in Attachment 1 which relate to this Deliverable I am aware that EPA may assess stipulated penalties for submission of a Deliverable that is not in compliance with the requirements of the SOW Attachment 1 thereto and all guidance documents specified in Attachment 1 to the SOW which relates to this Deliverable

Date A J JMroocr )oaySRSNE Kffitampajrfrp ect Coordinator

^NJ

JAMES RIVER CORPORATION FAX MEMO TO DATE

FAX NO NO PAGES

FROM TOTAL P03

APR 02 97 1335 PflGE03

TOTAL PAGE01

MESSAGE

RPR 03 97 08=22 FR JANES R1UER ENU-ENG 804J649 4369 TO 915084815159_

NOH-TNItCWTieU KMttLlaquoenol HO 1 INMOIta COVnUNHCWTAND TMUBMCMT OTrrCM

DHMOMTIUmON OF COMMJMCE MMRT M

I MOOWEMr OEMia OF MEW CMLAND INC bullUKIWMDMTC

oim legion miMcmc IT

laquo Hun n 1M7

ReSDondent Certification

I certify to the best of nay knowledge and professional judgement and after appropriate inquiries of all relevant persons involved in the preparation of this Deliverable that all guidance documents specified in Attachment 1 of the SOW which relates to this Deliverable were reviewed in preparation of this Deliverable I further certify that the contents of this Deliverable comply with the requirements of the SOW Attachment 1 thereto and all guidance documents specified in Attachment 1 which relate to this Deliverable I am aware that EPA may assess stipulated penalties for submission of a Deliverable that is not in compliance with the requirements of the SOW Attachment 1 thereto and all guidance documents specified in Attachment 1 to the SOW which relates to this Deliverable

Date A J JMroocr )oaySRSNE Kffitampajrfrp ect Coordinator

^NJ

JAMES RIVER CORPORATION FAX MEMO TO DATE

FAX NO NO PAGES

FROM TOTAL P03

APR 02 97 1335 PflGE03

TOTAL PAGE01

MESSAGE

Table of Contents

10 Introduction 11 General 1 12 Amendments to Demonstration of Compliance Plan 1 13 Report Organization 2

20 Data Acquisition and Results 21 General 3 22 Containment System Monitoring 3

221 Reversal of Gradient Test - Requirement 1 3 222 Reversal of Gradient Test - Requirement 2 5

23 Treatment System Monitoring 6 231 Flow Rate Data 6 232 Sampling Results 6

30 Conclusions and System Adjustments 31 General 7 32 System Adjustments 7

Tables

Table 1 - Hydraulic Head Measurements - March 7 14 21 28 and 31 1997 Table 2 - Influent and Effluent Flow Rate Data Table 3 - Influent Sampling Results Table 4 - Effluent Sampling Results

Figures

Figure 1 - Overburden Hydraulic Head Contours Figure 2 - Hydrographs of CPZ-5 and CPZ-6

10 - Introduction

11 General

This Demonstration of Compliance Report (OCR) was prepared by Handex of New England Inc

(Handex) on behalf of the Solvents Recovery Service of New England Inc Superfund Site (SRSNE

Site) PRP Group to demonstrate the effectiveness of the Non-Time-Critical Removal Action No

1 (NTCRA 1) groundwater containment and treatment system at the SRSNE Site in Southington

Connecticut This OCR presents data collected during the period of March 1 through March 31

1997 The data presented in this DCR were obtained in general accordance with the United States

Environmental Protection Agency (USEPA)-approved Demonstration of Compliance Plan (DCP)

(BBL June 1995) The data acquisition schedule reporting and evaluation requirements for this

and future DCRs were described in the DCP

The groundwater containment system is installed in the Containment Area (Figure 1) which was

defined in the NTCRA 1 Statement of Work (SOW) The containment system includes an array

of 12 overburden groundwater extraction wells (RW-1 through RW-12) and a downgradient

hydraulic barrier (steel sheetpiling) that hydraulically and physically contain overburden

groundwater entering the Containment Area from the SRSNE Operations Area Water pumped

from the containment system is pretreated to remove metals and suspended solids treated by

ultraviolet (UV) oxidation and granular activated carbon systems to remove organic constituents

and discharged to the Quinnipiac River The pre-design investigation results and the designs of

the hydraulic barrier wall extraction wells and treatment system are described in detail in the

NTCRA 1 100 Groundwater Containment and Treatment System Design Report (100 Design

Report BBL December 1994) The NTCRA 1 system was constructed between February and July

1995 and started up in accordance with the USEPA-approved schedule on July 19 1995

12 Amendments to Demonstration of Compliance Plan

Overburden compliance piezometers CPZ-2A CPZ-4A and CPZ-6A were installed to provide

hydraulic head data adjacent to the south southeast and east sides of the hydraulic barrier wall

(Figure 1) Hydraulic head data from these three additional piezometers was used to demonstrate

the effectiveness of the groundwater containment system Long-term dewatering of the overburden

groundwater flow system has shown that compliance piezometers CPZ-2 CPZ-4 and CPZ-6 are

appropriate to demonstrate the steady-state effectiveness of the system

13 Report Organization

The remaining sections of this OCR describe

bull The acquisition and evaluation of field data used to verify the effectiveness of the

groundwater containment and treatment system as required by the DCP (Section 20) and

bull An overview of project status regarding system adjustments and the status of appropriate

or relevant and applicable requirements (ARARs) (Section 30)

20 - Data Acquisition and Results

27 General

The data required to demonstrate the effectiveness of the groundwater containment and treatment

system were obtained in the form of hydraulic head measurements from wells and piezometers

installed in the area of the containment system flow measurements from the extraction well array

and treatment system pumping rates and analytical results Field activities used to obtain these

data were performed in general accordance with the relevant standard operating procedures

presented in Appendix A of the DCP

22 Containment System Monitoring

As specified in the SOW the effectiveness of the groundwater containment system is evaluated

based on the results of a Reversal of Gradient Test which will show that the following two

requirements are achieved during the operation of the groundwater containment system

1 Within the Containment Area overburden groundwater east and downgradient of the

Operations Area is flowing in the direction of the groundwater extraction wells and

2 Overburden groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide that

forms east of the groundwater containment system

These two requirements of the Reversal of Gradient Test were evaluated based on hydraulic head

measurements at two different groups of wells and piezometers as discussed below in Sections 221

and 222 respectively

227 Reversal of Gradient Test - Requirement 1

To confirm that overburden groundwater east and downgradient of the Operations Area within the

Containment Area is flowing in the direction of the groundwater extraction wells (Reversal of

Gradient Test 1) weekly hydraulic head data were measured on March 7 14 21 28 and 31 1997

at the following overburden wellspiezometers in the vicinity of the groundwater containment

system

bull Extraction Wells RW-1 through RW-12

bull Monitoring Wells MW-409 MW-415 MWL-301 MWL-304 MWL-305 MWL-307 MWLshy

308 MWL-310 P-16 and P-2B and

bull Piezometers PZO-1 PZO-2 and PZO-3

Overburden groundwater elevations were also measured at the following wells to assess the

hydraulic response in the area between the hydraulic barrier wall and the Quinnipiac River

bull MWL-302 MWL-306 MWL-309 MWL-311 and TW-7A

The four weekly rounds of overburden hydraulic head data measured at the above-listed wells and

the compliance piezometers are presented in Table 1 The overburden hydraulic head data

measured on March 31 1997 presented as contours on Figure 1 indicate that the horizontal

hydraulic gradient between the SRSNE Operations Area and the extraction wells was

southeastward toward the extraction wells fulfilling Reversal of Gradient Test Requirement 1

Based on the data obtained from the monitoring wellspiezometers located outside the hydraulic

barrier wall the hydraulic divide east of the extraction wells is located along the outer (east)

surface of the hydraulic barrier wall at the approximate location shown on Figure 1

To evaluate the vertical hydraulic gradient between the overburden and bedrock in the vicinity of

the groundwater containment system groundwater elevations were measured at the following

wellspiezometers installed in the bedrock MW-408 MW-414 MW-416 PZR-1 PZR-2 and

PZR-4 (Table 1) Comparison of these hydraulic head data to those measured at nearby

overburden wellspiezometers on the same dates generally indicates that the vertical component

of the hydraulic gradient between the bedrock and the overburden was generally downward from

the overburden to the bedrock at these locations within the Containment Area Comparison of

hydraulic head data at overburden compliance piezometers CPZ-1 CPZ-3 CPZ-5 CPZ-7 and

CPZ-9 and adjacent bedrock piezometers CPZ-1 R CPZ-3R CPZ-5R CPZ-7R and CPZ-9R

however indicates that the gradients were consistently upward from the bedrock to the overburden

in the vicinity of the pumping wells and the hydraulic barrier wall throughout the period covered

by this OCR

222 Reversal of Gradient Test - Requirement 2

To verify that groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide identified

along the outer (east) surface of the hydraulic barrier wall (Figure 1) hydraulic head data were

measured each week at the 13 fully penetrating overburden compliance piezometers (CPZ-1

through CPZ-10 CPZ-2A CPZ-4A and CPZ-6A) These data are presented in Table 1 and are

included among the data used to develop the hydraulic head contours shown on Figure 1 As

stated in the DCP the hydraulic gradient can be considered reversed and inward across the

hydraulic barrier wall when the hydraulic head data measured at each compliance piezometer

located inside the hydraulic barrier wall (CPZ-1 CPZ-3 CPZ-5 CPZ-7 and CPZ-9) is at least 03

foot lower than the head measured at the corresponding compliance piezometer located outside

the hydraulic barrier wall (CPZ-2 CPZ-4 CPZ-6 CPZ-8 and CPZ-10 respectively) As indicated

by the hydraulic head data the required 03-foot head differential was achieved at all five pairs of

overburden compliance piezometers for the five weekly rounds of overburden hydraulic head

measurements which fulfills Reversal of Gradient Test Requirement 2 (Table 1) The inward

head differentials measured weekly at the overburden compliance piezometers between March 1

and March 31 1997 ranged from 127 feet (CPZ-7CPZ-8 on March 14 1997) to 1155 feet

(CPZ-5CPZ-6 on March 21 1997) The containment system therefore met the requirements of

the DCP during the period between March 1 and March 31 1997

5

To verify the temporal continuity of the reversal of gradient across the hydraulic barrier wall

hydraulic head measurements were recorded using pressure transducers and a data logger during

the period covered by this OCR at compliance piezometers CPZ-5 and CPZ-6 These data are

presented as hydrographs on Figure 2

Referring to Figure 2 two spikes are observed for the period covered by this OCR The first spike

occurred on March 10 1997 in response to a power outage during which time the treatment plant

was without power for several hours The second spike occurred on March 18 as a result of a

mechanical problem with the sand filter The hydraulic head at inner compliance piezometer CPZshy

5 was at least 03 foot lower than that at outer compliance piezometer CPZ-6 throughout the

period covered by this DCR The hydrographs of CPZ-5 and CPZ-6 agree with the March 31

1997 hydraulic head contours indicating an inward head differential of at least 03 foot in the

center of the hydraulic barrier wall during the period from March 1 through March 31 1997

23 Treatment System Monitoring

The data used to evaluate the operation of the groundwater treatment system include influent and

effluent flow measurements and laboratory analytical data for influent and effluent samples These

data are presented and discussed in Sections 231 and 232 respectively

237 Flow Rate Data

The influent and effluent flow rate at the groundwater treatment system were each recorded

continuously using an in-line totalizing flow meter and stripchart recorder located in the treatment

system building The cumulative volume of influent pumped each week to the treatment system

from the containment system extraction wells and treatment system effluent pumped to the

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

10 - Introduction

11 General

This Demonstration of Compliance Report (OCR) was prepared by Handex of New England Inc

(Handex) on behalf of the Solvents Recovery Service of New England Inc Superfund Site (SRSNE

Site) PRP Group to demonstrate the effectiveness of the Non-Time-Critical Removal Action No

1 (NTCRA 1) groundwater containment and treatment system at the SRSNE Site in Southington

Connecticut This OCR presents data collected during the period of March 1 through March 31

1997 The data presented in this DCR were obtained in general accordance with the United States

Environmental Protection Agency (USEPA)-approved Demonstration of Compliance Plan (DCP)

(BBL June 1995) The data acquisition schedule reporting and evaluation requirements for this

and future DCRs were described in the DCP

The groundwater containment system is installed in the Containment Area (Figure 1) which was

defined in the NTCRA 1 Statement of Work (SOW) The containment system includes an array

of 12 overburden groundwater extraction wells (RW-1 through RW-12) and a downgradient

hydraulic barrier (steel sheetpiling) that hydraulically and physically contain overburden

groundwater entering the Containment Area from the SRSNE Operations Area Water pumped

from the containment system is pretreated to remove metals and suspended solids treated by

ultraviolet (UV) oxidation and granular activated carbon systems to remove organic constituents

and discharged to the Quinnipiac River The pre-design investigation results and the designs of

the hydraulic barrier wall extraction wells and treatment system are described in detail in the

NTCRA 1 100 Groundwater Containment and Treatment System Design Report (100 Design

Report BBL December 1994) The NTCRA 1 system was constructed between February and July

1995 and started up in accordance with the USEPA-approved schedule on July 19 1995

12 Amendments to Demonstration of Compliance Plan

Overburden compliance piezometers CPZ-2A CPZ-4A and CPZ-6A were installed to provide

hydraulic head data adjacent to the south southeast and east sides of the hydraulic barrier wall

(Figure 1) Hydraulic head data from these three additional piezometers was used to demonstrate

the effectiveness of the groundwater containment system Long-term dewatering of the overburden

groundwater flow system has shown that compliance piezometers CPZ-2 CPZ-4 and CPZ-6 are

appropriate to demonstrate the steady-state effectiveness of the system

13 Report Organization

The remaining sections of this OCR describe

bull The acquisition and evaluation of field data used to verify the effectiveness of the

groundwater containment and treatment system as required by the DCP (Section 20) and

bull An overview of project status regarding system adjustments and the status of appropriate

or relevant and applicable requirements (ARARs) (Section 30)

20 - Data Acquisition and Results

27 General

The data required to demonstrate the effectiveness of the groundwater containment and treatment

system were obtained in the form of hydraulic head measurements from wells and piezometers

installed in the area of the containment system flow measurements from the extraction well array

and treatment system pumping rates and analytical results Field activities used to obtain these

data were performed in general accordance with the relevant standard operating procedures

presented in Appendix A of the DCP

22 Containment System Monitoring

As specified in the SOW the effectiveness of the groundwater containment system is evaluated

based on the results of a Reversal of Gradient Test which will show that the following two

requirements are achieved during the operation of the groundwater containment system

1 Within the Containment Area overburden groundwater east and downgradient of the

Operations Area is flowing in the direction of the groundwater extraction wells and

2 Overburden groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide that

forms east of the groundwater containment system

These two requirements of the Reversal of Gradient Test were evaluated based on hydraulic head

measurements at two different groups of wells and piezometers as discussed below in Sections 221

and 222 respectively

227 Reversal of Gradient Test - Requirement 1

To confirm that overburden groundwater east and downgradient of the Operations Area within the

Containment Area is flowing in the direction of the groundwater extraction wells (Reversal of

Gradient Test 1) weekly hydraulic head data were measured on March 7 14 21 28 and 31 1997

at the following overburden wellspiezometers in the vicinity of the groundwater containment

system

bull Extraction Wells RW-1 through RW-12

bull Monitoring Wells MW-409 MW-415 MWL-301 MWL-304 MWL-305 MWL-307 MWLshy

308 MWL-310 P-16 and P-2B and

bull Piezometers PZO-1 PZO-2 and PZO-3

Overburden groundwater elevations were also measured at the following wells to assess the

hydraulic response in the area between the hydraulic barrier wall and the Quinnipiac River

bull MWL-302 MWL-306 MWL-309 MWL-311 and TW-7A

The four weekly rounds of overburden hydraulic head data measured at the above-listed wells and

the compliance piezometers are presented in Table 1 The overburden hydraulic head data

measured on March 31 1997 presented as contours on Figure 1 indicate that the horizontal

hydraulic gradient between the SRSNE Operations Area and the extraction wells was

southeastward toward the extraction wells fulfilling Reversal of Gradient Test Requirement 1

Based on the data obtained from the monitoring wellspiezometers located outside the hydraulic

barrier wall the hydraulic divide east of the extraction wells is located along the outer (east)

surface of the hydraulic barrier wall at the approximate location shown on Figure 1

To evaluate the vertical hydraulic gradient between the overburden and bedrock in the vicinity of

the groundwater containment system groundwater elevations were measured at the following

wellspiezometers installed in the bedrock MW-408 MW-414 MW-416 PZR-1 PZR-2 and

PZR-4 (Table 1) Comparison of these hydraulic head data to those measured at nearby

overburden wellspiezometers on the same dates generally indicates that the vertical component

of the hydraulic gradient between the bedrock and the overburden was generally downward from

the overburden to the bedrock at these locations within the Containment Area Comparison of

hydraulic head data at overburden compliance piezometers CPZ-1 CPZ-3 CPZ-5 CPZ-7 and

CPZ-9 and adjacent bedrock piezometers CPZ-1 R CPZ-3R CPZ-5R CPZ-7R and CPZ-9R

however indicates that the gradients were consistently upward from the bedrock to the overburden

in the vicinity of the pumping wells and the hydraulic barrier wall throughout the period covered

by this OCR

222 Reversal of Gradient Test - Requirement 2

To verify that groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide identified

along the outer (east) surface of the hydraulic barrier wall (Figure 1) hydraulic head data were

measured each week at the 13 fully penetrating overburden compliance piezometers (CPZ-1

through CPZ-10 CPZ-2A CPZ-4A and CPZ-6A) These data are presented in Table 1 and are

included among the data used to develop the hydraulic head contours shown on Figure 1 As

stated in the DCP the hydraulic gradient can be considered reversed and inward across the

hydraulic barrier wall when the hydraulic head data measured at each compliance piezometer

located inside the hydraulic barrier wall (CPZ-1 CPZ-3 CPZ-5 CPZ-7 and CPZ-9) is at least 03

foot lower than the head measured at the corresponding compliance piezometer located outside

the hydraulic barrier wall (CPZ-2 CPZ-4 CPZ-6 CPZ-8 and CPZ-10 respectively) As indicated

by the hydraulic head data the required 03-foot head differential was achieved at all five pairs of

overburden compliance piezometers for the five weekly rounds of overburden hydraulic head

measurements which fulfills Reversal of Gradient Test Requirement 2 (Table 1) The inward

head differentials measured weekly at the overburden compliance piezometers between March 1

and March 31 1997 ranged from 127 feet (CPZ-7CPZ-8 on March 14 1997) to 1155 feet

(CPZ-5CPZ-6 on March 21 1997) The containment system therefore met the requirements of

the DCP during the period between March 1 and March 31 1997

5

To verify the temporal continuity of the reversal of gradient across the hydraulic barrier wall

hydraulic head measurements were recorded using pressure transducers and a data logger during

the period covered by this OCR at compliance piezometers CPZ-5 and CPZ-6 These data are

presented as hydrographs on Figure 2

Referring to Figure 2 two spikes are observed for the period covered by this OCR The first spike

occurred on March 10 1997 in response to a power outage during which time the treatment plant

was without power for several hours The second spike occurred on March 18 as a result of a

mechanical problem with the sand filter The hydraulic head at inner compliance piezometer CPZshy

5 was at least 03 foot lower than that at outer compliance piezometer CPZ-6 throughout the

period covered by this DCR The hydrographs of CPZ-5 and CPZ-6 agree with the March 31

1997 hydraulic head contours indicating an inward head differential of at least 03 foot in the

center of the hydraulic barrier wall during the period from March 1 through March 31 1997

23 Treatment System Monitoring

The data used to evaluate the operation of the groundwater treatment system include influent and

effluent flow measurements and laboratory analytical data for influent and effluent samples These

data are presented and discussed in Sections 231 and 232 respectively

237 Flow Rate Data

The influent and effluent flow rate at the groundwater treatment system were each recorded

continuously using an in-line totalizing flow meter and stripchart recorder located in the treatment

system building The cumulative volume of influent pumped each week to the treatment system

from the containment system extraction wells and treatment system effluent pumped to the

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

12 Amendments to Demonstration of Compliance Plan

Overburden compliance piezometers CPZ-2A CPZ-4A and CPZ-6A were installed to provide

hydraulic head data adjacent to the south southeast and east sides of the hydraulic barrier wall

(Figure 1) Hydraulic head data from these three additional piezometers was used to demonstrate

the effectiveness of the groundwater containment system Long-term dewatering of the overburden

groundwater flow system has shown that compliance piezometers CPZ-2 CPZ-4 and CPZ-6 are

appropriate to demonstrate the steady-state effectiveness of the system

13 Report Organization

The remaining sections of this OCR describe

bull The acquisition and evaluation of field data used to verify the effectiveness of the

groundwater containment and treatment system as required by the DCP (Section 20) and

bull An overview of project status regarding system adjustments and the status of appropriate

or relevant and applicable requirements (ARARs) (Section 30)

20 - Data Acquisition and Results

27 General

The data required to demonstrate the effectiveness of the groundwater containment and treatment

system were obtained in the form of hydraulic head measurements from wells and piezometers

installed in the area of the containment system flow measurements from the extraction well array

and treatment system pumping rates and analytical results Field activities used to obtain these

data were performed in general accordance with the relevant standard operating procedures

presented in Appendix A of the DCP

22 Containment System Monitoring

As specified in the SOW the effectiveness of the groundwater containment system is evaluated

based on the results of a Reversal of Gradient Test which will show that the following two

requirements are achieved during the operation of the groundwater containment system

1 Within the Containment Area overburden groundwater east and downgradient of the

Operations Area is flowing in the direction of the groundwater extraction wells and

2 Overburden groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide that

forms east of the groundwater containment system

These two requirements of the Reversal of Gradient Test were evaluated based on hydraulic head

measurements at two different groups of wells and piezometers as discussed below in Sections 221

and 222 respectively

227 Reversal of Gradient Test - Requirement 1

To confirm that overburden groundwater east and downgradient of the Operations Area within the

Containment Area is flowing in the direction of the groundwater extraction wells (Reversal of

Gradient Test 1) weekly hydraulic head data were measured on March 7 14 21 28 and 31 1997

at the following overburden wellspiezometers in the vicinity of the groundwater containment

system

bull Extraction Wells RW-1 through RW-12

bull Monitoring Wells MW-409 MW-415 MWL-301 MWL-304 MWL-305 MWL-307 MWLshy

308 MWL-310 P-16 and P-2B and

bull Piezometers PZO-1 PZO-2 and PZO-3

Overburden groundwater elevations were also measured at the following wells to assess the

hydraulic response in the area between the hydraulic barrier wall and the Quinnipiac River

bull MWL-302 MWL-306 MWL-309 MWL-311 and TW-7A

The four weekly rounds of overburden hydraulic head data measured at the above-listed wells and

the compliance piezometers are presented in Table 1 The overburden hydraulic head data

measured on March 31 1997 presented as contours on Figure 1 indicate that the horizontal

hydraulic gradient between the SRSNE Operations Area and the extraction wells was

southeastward toward the extraction wells fulfilling Reversal of Gradient Test Requirement 1

Based on the data obtained from the monitoring wellspiezometers located outside the hydraulic

barrier wall the hydraulic divide east of the extraction wells is located along the outer (east)

surface of the hydraulic barrier wall at the approximate location shown on Figure 1

To evaluate the vertical hydraulic gradient between the overburden and bedrock in the vicinity of

the groundwater containment system groundwater elevations were measured at the following

wellspiezometers installed in the bedrock MW-408 MW-414 MW-416 PZR-1 PZR-2 and

PZR-4 (Table 1) Comparison of these hydraulic head data to those measured at nearby

overburden wellspiezometers on the same dates generally indicates that the vertical component

of the hydraulic gradient between the bedrock and the overburden was generally downward from

the overburden to the bedrock at these locations within the Containment Area Comparison of

hydraulic head data at overburden compliance piezometers CPZ-1 CPZ-3 CPZ-5 CPZ-7 and

CPZ-9 and adjacent bedrock piezometers CPZ-1 R CPZ-3R CPZ-5R CPZ-7R and CPZ-9R

however indicates that the gradients were consistently upward from the bedrock to the overburden

in the vicinity of the pumping wells and the hydraulic barrier wall throughout the period covered

by this OCR

222 Reversal of Gradient Test - Requirement 2

To verify that groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide identified

along the outer (east) surface of the hydraulic barrier wall (Figure 1) hydraulic head data were

measured each week at the 13 fully penetrating overburden compliance piezometers (CPZ-1

through CPZ-10 CPZ-2A CPZ-4A and CPZ-6A) These data are presented in Table 1 and are

included among the data used to develop the hydraulic head contours shown on Figure 1 As

stated in the DCP the hydraulic gradient can be considered reversed and inward across the

hydraulic barrier wall when the hydraulic head data measured at each compliance piezometer

located inside the hydraulic barrier wall (CPZ-1 CPZ-3 CPZ-5 CPZ-7 and CPZ-9) is at least 03

foot lower than the head measured at the corresponding compliance piezometer located outside

the hydraulic barrier wall (CPZ-2 CPZ-4 CPZ-6 CPZ-8 and CPZ-10 respectively) As indicated

by the hydraulic head data the required 03-foot head differential was achieved at all five pairs of

overburden compliance piezometers for the five weekly rounds of overburden hydraulic head

measurements which fulfills Reversal of Gradient Test Requirement 2 (Table 1) The inward

head differentials measured weekly at the overburden compliance piezometers between March 1

and March 31 1997 ranged from 127 feet (CPZ-7CPZ-8 on March 14 1997) to 1155 feet

(CPZ-5CPZ-6 on March 21 1997) The containment system therefore met the requirements of

the DCP during the period between March 1 and March 31 1997

5

To verify the temporal continuity of the reversal of gradient across the hydraulic barrier wall

hydraulic head measurements were recorded using pressure transducers and a data logger during

the period covered by this OCR at compliance piezometers CPZ-5 and CPZ-6 These data are

presented as hydrographs on Figure 2

Referring to Figure 2 two spikes are observed for the period covered by this OCR The first spike

occurred on March 10 1997 in response to a power outage during which time the treatment plant

was without power for several hours The second spike occurred on March 18 as a result of a

mechanical problem with the sand filter The hydraulic head at inner compliance piezometer CPZshy

5 was at least 03 foot lower than that at outer compliance piezometer CPZ-6 throughout the

period covered by this DCR The hydrographs of CPZ-5 and CPZ-6 agree with the March 31

1997 hydraulic head contours indicating an inward head differential of at least 03 foot in the

center of the hydraulic barrier wall during the period from March 1 through March 31 1997

23 Treatment System Monitoring

The data used to evaluate the operation of the groundwater treatment system include influent and

effluent flow measurements and laboratory analytical data for influent and effluent samples These

data are presented and discussed in Sections 231 and 232 respectively

237 Flow Rate Data

The influent and effluent flow rate at the groundwater treatment system were each recorded

continuously using an in-line totalizing flow meter and stripchart recorder located in the treatment

system building The cumulative volume of influent pumped each week to the treatment system

from the containment system extraction wells and treatment system effluent pumped to the

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

20 - Data Acquisition and Results

27 General

The data required to demonstrate the effectiveness of the groundwater containment and treatment

system were obtained in the form of hydraulic head measurements from wells and piezometers

installed in the area of the containment system flow measurements from the extraction well array

and treatment system pumping rates and analytical results Field activities used to obtain these

data were performed in general accordance with the relevant standard operating procedures

presented in Appendix A of the DCP

22 Containment System Monitoring

As specified in the SOW the effectiveness of the groundwater containment system is evaluated

based on the results of a Reversal of Gradient Test which will show that the following two

requirements are achieved during the operation of the groundwater containment system

1 Within the Containment Area overburden groundwater east and downgradient of the

Operations Area is flowing in the direction of the groundwater extraction wells and

2 Overburden groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide that

forms east of the groundwater containment system

These two requirements of the Reversal of Gradient Test were evaluated based on hydraulic head

measurements at two different groups of wells and piezometers as discussed below in Sections 221

and 222 respectively

227 Reversal of Gradient Test - Requirement 1

To confirm that overburden groundwater east and downgradient of the Operations Area within the

Containment Area is flowing in the direction of the groundwater extraction wells (Reversal of

Gradient Test 1) weekly hydraulic head data were measured on March 7 14 21 28 and 31 1997

at the following overburden wellspiezometers in the vicinity of the groundwater containment

system

bull Extraction Wells RW-1 through RW-12

bull Monitoring Wells MW-409 MW-415 MWL-301 MWL-304 MWL-305 MWL-307 MWLshy

308 MWL-310 P-16 and P-2B and

bull Piezometers PZO-1 PZO-2 and PZO-3

Overburden groundwater elevations were also measured at the following wells to assess the

hydraulic response in the area between the hydraulic barrier wall and the Quinnipiac River

bull MWL-302 MWL-306 MWL-309 MWL-311 and TW-7A

The four weekly rounds of overburden hydraulic head data measured at the above-listed wells and

the compliance piezometers are presented in Table 1 The overburden hydraulic head data

measured on March 31 1997 presented as contours on Figure 1 indicate that the horizontal

hydraulic gradient between the SRSNE Operations Area and the extraction wells was

southeastward toward the extraction wells fulfilling Reversal of Gradient Test Requirement 1

Based on the data obtained from the monitoring wellspiezometers located outside the hydraulic

barrier wall the hydraulic divide east of the extraction wells is located along the outer (east)

surface of the hydraulic barrier wall at the approximate location shown on Figure 1

To evaluate the vertical hydraulic gradient between the overburden and bedrock in the vicinity of

the groundwater containment system groundwater elevations were measured at the following

wellspiezometers installed in the bedrock MW-408 MW-414 MW-416 PZR-1 PZR-2 and

PZR-4 (Table 1) Comparison of these hydraulic head data to those measured at nearby

overburden wellspiezometers on the same dates generally indicates that the vertical component

of the hydraulic gradient between the bedrock and the overburden was generally downward from

the overburden to the bedrock at these locations within the Containment Area Comparison of

hydraulic head data at overburden compliance piezometers CPZ-1 CPZ-3 CPZ-5 CPZ-7 and

CPZ-9 and adjacent bedrock piezometers CPZ-1 R CPZ-3R CPZ-5R CPZ-7R and CPZ-9R

however indicates that the gradients were consistently upward from the bedrock to the overburden

in the vicinity of the pumping wells and the hydraulic barrier wall throughout the period covered

by this OCR

222 Reversal of Gradient Test - Requirement 2

To verify that groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide identified

along the outer (east) surface of the hydraulic barrier wall (Figure 1) hydraulic head data were

measured each week at the 13 fully penetrating overburden compliance piezometers (CPZ-1

through CPZ-10 CPZ-2A CPZ-4A and CPZ-6A) These data are presented in Table 1 and are

included among the data used to develop the hydraulic head contours shown on Figure 1 As

stated in the DCP the hydraulic gradient can be considered reversed and inward across the

hydraulic barrier wall when the hydraulic head data measured at each compliance piezometer

located inside the hydraulic barrier wall (CPZ-1 CPZ-3 CPZ-5 CPZ-7 and CPZ-9) is at least 03

foot lower than the head measured at the corresponding compliance piezometer located outside

the hydraulic barrier wall (CPZ-2 CPZ-4 CPZ-6 CPZ-8 and CPZ-10 respectively) As indicated

by the hydraulic head data the required 03-foot head differential was achieved at all five pairs of

overburden compliance piezometers for the five weekly rounds of overburden hydraulic head

measurements which fulfills Reversal of Gradient Test Requirement 2 (Table 1) The inward

head differentials measured weekly at the overburden compliance piezometers between March 1

and March 31 1997 ranged from 127 feet (CPZ-7CPZ-8 on March 14 1997) to 1155 feet

(CPZ-5CPZ-6 on March 21 1997) The containment system therefore met the requirements of

the DCP during the period between March 1 and March 31 1997

5

To verify the temporal continuity of the reversal of gradient across the hydraulic barrier wall

hydraulic head measurements were recorded using pressure transducers and a data logger during

the period covered by this OCR at compliance piezometers CPZ-5 and CPZ-6 These data are

presented as hydrographs on Figure 2

Referring to Figure 2 two spikes are observed for the period covered by this OCR The first spike

occurred on March 10 1997 in response to a power outage during which time the treatment plant

was without power for several hours The second spike occurred on March 18 as a result of a

mechanical problem with the sand filter The hydraulic head at inner compliance piezometer CPZshy

5 was at least 03 foot lower than that at outer compliance piezometer CPZ-6 throughout the

period covered by this DCR The hydrographs of CPZ-5 and CPZ-6 agree with the March 31

1997 hydraulic head contours indicating an inward head differential of at least 03 foot in the

center of the hydraulic barrier wall during the period from March 1 through March 31 1997

23 Treatment System Monitoring

The data used to evaluate the operation of the groundwater treatment system include influent and

effluent flow measurements and laboratory analytical data for influent and effluent samples These

data are presented and discussed in Sections 231 and 232 respectively

237 Flow Rate Data

The influent and effluent flow rate at the groundwater treatment system were each recorded

continuously using an in-line totalizing flow meter and stripchart recorder located in the treatment

system building The cumulative volume of influent pumped each week to the treatment system

from the containment system extraction wells and treatment system effluent pumped to the

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

Gradient Test 1) weekly hydraulic head data were measured on March 7 14 21 28 and 31 1997

at the following overburden wellspiezometers in the vicinity of the groundwater containment

system

bull Extraction Wells RW-1 through RW-12

bull Monitoring Wells MW-409 MW-415 MWL-301 MWL-304 MWL-305 MWL-307 MWLshy

308 MWL-310 P-16 and P-2B and

bull Piezometers PZO-1 PZO-2 and PZO-3

Overburden groundwater elevations were also measured at the following wells to assess the

hydraulic response in the area between the hydraulic barrier wall and the Quinnipiac River

bull MWL-302 MWL-306 MWL-309 MWL-311 and TW-7A

The four weekly rounds of overburden hydraulic head data measured at the above-listed wells and

the compliance piezometers are presented in Table 1 The overburden hydraulic head data

measured on March 31 1997 presented as contours on Figure 1 indicate that the horizontal

hydraulic gradient between the SRSNE Operations Area and the extraction wells was

southeastward toward the extraction wells fulfilling Reversal of Gradient Test Requirement 1

Based on the data obtained from the monitoring wellspiezometers located outside the hydraulic

barrier wall the hydraulic divide east of the extraction wells is located along the outer (east)

surface of the hydraulic barrier wall at the approximate location shown on Figure 1

To evaluate the vertical hydraulic gradient between the overburden and bedrock in the vicinity of

the groundwater containment system groundwater elevations were measured at the following

wellspiezometers installed in the bedrock MW-408 MW-414 MW-416 PZR-1 PZR-2 and

PZR-4 (Table 1) Comparison of these hydraulic head data to those measured at nearby

overburden wellspiezometers on the same dates generally indicates that the vertical component

of the hydraulic gradient between the bedrock and the overburden was generally downward from

the overburden to the bedrock at these locations within the Containment Area Comparison of

hydraulic head data at overburden compliance piezometers CPZ-1 CPZ-3 CPZ-5 CPZ-7 and

CPZ-9 and adjacent bedrock piezometers CPZ-1 R CPZ-3R CPZ-5R CPZ-7R and CPZ-9R

however indicates that the gradients were consistently upward from the bedrock to the overburden

in the vicinity of the pumping wells and the hydraulic barrier wall throughout the period covered

by this OCR

222 Reversal of Gradient Test - Requirement 2

To verify that groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide identified

along the outer (east) surface of the hydraulic barrier wall (Figure 1) hydraulic head data were

measured each week at the 13 fully penetrating overburden compliance piezometers (CPZ-1

through CPZ-10 CPZ-2A CPZ-4A and CPZ-6A) These data are presented in Table 1 and are

included among the data used to develop the hydraulic head contours shown on Figure 1 As

stated in the DCP the hydraulic gradient can be considered reversed and inward across the

hydraulic barrier wall when the hydraulic head data measured at each compliance piezometer

located inside the hydraulic barrier wall (CPZ-1 CPZ-3 CPZ-5 CPZ-7 and CPZ-9) is at least 03

foot lower than the head measured at the corresponding compliance piezometer located outside

the hydraulic barrier wall (CPZ-2 CPZ-4 CPZ-6 CPZ-8 and CPZ-10 respectively) As indicated

by the hydraulic head data the required 03-foot head differential was achieved at all five pairs of

overburden compliance piezometers for the five weekly rounds of overburden hydraulic head

measurements which fulfills Reversal of Gradient Test Requirement 2 (Table 1) The inward

head differentials measured weekly at the overburden compliance piezometers between March 1

and March 31 1997 ranged from 127 feet (CPZ-7CPZ-8 on March 14 1997) to 1155 feet

(CPZ-5CPZ-6 on March 21 1997) The containment system therefore met the requirements of

the DCP during the period between March 1 and March 31 1997

5

To verify the temporal continuity of the reversal of gradient across the hydraulic barrier wall

hydraulic head measurements were recorded using pressure transducers and a data logger during

the period covered by this OCR at compliance piezometers CPZ-5 and CPZ-6 These data are

presented as hydrographs on Figure 2

Referring to Figure 2 two spikes are observed for the period covered by this OCR The first spike

occurred on March 10 1997 in response to a power outage during which time the treatment plant

was without power for several hours The second spike occurred on March 18 as a result of a

mechanical problem with the sand filter The hydraulic head at inner compliance piezometer CPZshy

5 was at least 03 foot lower than that at outer compliance piezometer CPZ-6 throughout the

period covered by this DCR The hydrographs of CPZ-5 and CPZ-6 agree with the March 31

1997 hydraulic head contours indicating an inward head differential of at least 03 foot in the

center of the hydraulic barrier wall during the period from March 1 through March 31 1997

23 Treatment System Monitoring

The data used to evaluate the operation of the groundwater treatment system include influent and

effluent flow measurements and laboratory analytical data for influent and effluent samples These

data are presented and discussed in Sections 231 and 232 respectively

237 Flow Rate Data

The influent and effluent flow rate at the groundwater treatment system were each recorded

continuously using an in-line totalizing flow meter and stripchart recorder located in the treatment

system building The cumulative volume of influent pumped each week to the treatment system

from the containment system extraction wells and treatment system effluent pumped to the

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

of the hydraulic gradient between the bedrock and the overburden was generally downward from

the overburden to the bedrock at these locations within the Containment Area Comparison of

hydraulic head data at overburden compliance piezometers CPZ-1 CPZ-3 CPZ-5 CPZ-7 and

CPZ-9 and adjacent bedrock piezometers CPZ-1 R CPZ-3R CPZ-5R CPZ-7R and CPZ-9R

however indicates that the gradients were consistently upward from the bedrock to the overburden

in the vicinity of the pumping wells and the hydraulic barrier wall throughout the period covered

by this OCR

222 Reversal of Gradient Test - Requirement 2

To verify that groundwater flow is reversed and maintained in the direction of the groundwater

extraction wells within the area defined by (west of) the interpreted hydraulic divide identified

along the outer (east) surface of the hydraulic barrier wall (Figure 1) hydraulic head data were

measured each week at the 13 fully penetrating overburden compliance piezometers (CPZ-1

through CPZ-10 CPZ-2A CPZ-4A and CPZ-6A) These data are presented in Table 1 and are

included among the data used to develop the hydraulic head contours shown on Figure 1 As

stated in the DCP the hydraulic gradient can be considered reversed and inward across the

hydraulic barrier wall when the hydraulic head data measured at each compliance piezometer

located inside the hydraulic barrier wall (CPZ-1 CPZ-3 CPZ-5 CPZ-7 and CPZ-9) is at least 03

foot lower than the head measured at the corresponding compliance piezometer located outside

the hydraulic barrier wall (CPZ-2 CPZ-4 CPZ-6 CPZ-8 and CPZ-10 respectively) As indicated

by the hydraulic head data the required 03-foot head differential was achieved at all five pairs of

overburden compliance piezometers for the five weekly rounds of overburden hydraulic head

measurements which fulfills Reversal of Gradient Test Requirement 2 (Table 1) The inward

head differentials measured weekly at the overburden compliance piezometers between March 1

and March 31 1997 ranged from 127 feet (CPZ-7CPZ-8 on March 14 1997) to 1155 feet

(CPZ-5CPZ-6 on March 21 1997) The containment system therefore met the requirements of

the DCP during the period between March 1 and March 31 1997

5

To verify the temporal continuity of the reversal of gradient across the hydraulic barrier wall

hydraulic head measurements were recorded using pressure transducers and a data logger during

the period covered by this OCR at compliance piezometers CPZ-5 and CPZ-6 These data are

presented as hydrographs on Figure 2

Referring to Figure 2 two spikes are observed for the period covered by this OCR The first spike

occurred on March 10 1997 in response to a power outage during which time the treatment plant

was without power for several hours The second spike occurred on March 18 as a result of a

mechanical problem with the sand filter The hydraulic head at inner compliance piezometer CPZshy

5 was at least 03 foot lower than that at outer compliance piezometer CPZ-6 throughout the

period covered by this DCR The hydrographs of CPZ-5 and CPZ-6 agree with the March 31

1997 hydraulic head contours indicating an inward head differential of at least 03 foot in the

center of the hydraulic barrier wall during the period from March 1 through March 31 1997

23 Treatment System Monitoring

The data used to evaluate the operation of the groundwater treatment system include influent and

effluent flow measurements and laboratory analytical data for influent and effluent samples These

data are presented and discussed in Sections 231 and 232 respectively

237 Flow Rate Data

The influent and effluent flow rate at the groundwater treatment system were each recorded

continuously using an in-line totalizing flow meter and stripchart recorder located in the treatment

system building The cumulative volume of influent pumped each week to the treatment system

from the containment system extraction wells and treatment system effluent pumped to the

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

To verify the temporal continuity of the reversal of gradient across the hydraulic barrier wall

hydraulic head measurements were recorded using pressure transducers and a data logger during

the period covered by this OCR at compliance piezometers CPZ-5 and CPZ-6 These data are

presented as hydrographs on Figure 2

Referring to Figure 2 two spikes are observed for the period covered by this OCR The first spike

occurred on March 10 1997 in response to a power outage during which time the treatment plant

was without power for several hours The second spike occurred on March 18 as a result of a

mechanical problem with the sand filter The hydraulic head at inner compliance piezometer CPZshy

5 was at least 03 foot lower than that at outer compliance piezometer CPZ-6 throughout the

period covered by this DCR The hydrographs of CPZ-5 and CPZ-6 agree with the March 31

1997 hydraulic head contours indicating an inward head differential of at least 03 foot in the

center of the hydraulic barrier wall during the period from March 1 through March 31 1997

23 Treatment System Monitoring

The data used to evaluate the operation of the groundwater treatment system include influent and

effluent flow measurements and laboratory analytical data for influent and effluent samples These

data are presented and discussed in Sections 231 and 232 respectively

237 Flow Rate Data

The influent and effluent flow rate at the groundwater treatment system were each recorded

continuously using an in-line totalizing flow meter and stripchart recorder located in the treatment

system building The cumulative volume of influent pumped each week to the treatment system

from the containment system extraction wells and treatment system effluent pumped to the

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

Quinnipiac River are presented on Table 2 These data show that the near steady-state rate of the

treatment system influent flow rate is approximately 21 gallons per minute (gpm)

232 Sampling Results

Samples of groundwater treatment system influent and effluent were obtained on March 5 and 20

1997 The available analytical results from influent and effluent samples obtained on March 5 and

20 1997 are summarized on Tables 3 and 4 respectively In Table 4 the effluent sampling results

are compared with the modified discharge limits established by the Connecticut Department of

Environmental Protection (CT DEP) in the Substantive Requirement for Discharge dated

November 9 1995 These effluent data show that the discharge limits were achieved by the

groundwater treatment system

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

30 - Conclusions and System Adjustments

31 General

Based on the NCTRA 1 groundwater containment and treatment system monitoring data presented

above the performance standards specified in the DCP were achieved during the period from

March 1 through March 31 1997

32 System Adjustments

Handex replaced the Centaur carbon in the secondary GAC units on March 31 1997 No other

major maintenance or repair activities were performed during the period covered by this DCR

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

Tables

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

TABLE 1

HYDRAULIC HEAD MEASUREMENTS - MARCH 1997

ocation

DPZ-1 PZ-1R

pz-2 DPZ-2A

IPZ-2R bull

pz-3 pz-3R bull

pz-4 pz-4A

PZ-4R

PZ-S DPZ-5R

pz-6 2PZ-6A

2PZ-6R

5PZ-7

JPZ-7Rshy

5PZ-B

JPZ-8R

PZ-9

5PZ-9R

pz-io PZ-10H

Wamp88amp WV-125A

W-12SC

dW-408

dW-409

bull1W-414

WV-415

dW-416

WL-301

WL-302

WVL-304

rfWL-305

lWL-306

WVL-307

AVL-308

UIWL-309

ldWL-310

KtWL-311

J-2B

gt-5A

gt-5B 5 -6shy

M6

gtZO-1

gtZO-2

gtZO-3

ZR-1

ZR-2

ZR-4

(W-1

WV-2

1W-3

W-4

WV-S

WV-6

WV-7

M-8

WV-9

WV-10

WV-11

WV-12

FW-7A

NOTE

Formation

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Bedrock

raquoVlaquoiSWraquolttS

Bedrock

Bedrock

Bedrock

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Bedrock

Overburden

Bedrock

Overburden

Overburden

Overburden

Overburden

Bedrock

Bedrock

Bedrock

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

Overburden

CASINO

ELEVATIO

15973

161 32 15864

158 86 16079

15949

16083

15880

15947

15873

15860

15852

15447

158 17

15449

15954

15861

16035

16080

16056

16245

16097

16097

m$mgtM 15787

15799

15936

15941

161 18

160 65

15984

16033

161 60

15999

15901 15527

15909

158 63

15461

1S966

15733

16593

15761

158 17

153 77

16488

15854

15985

16040

15932

15929

1S902

15756

15651

15724

158 19

1S990

15923

157 16

15692

15668

15647

15782

15850

15850

030797

Depth

to Water

707 040 423 407

020

1288

708

735

787

563

1825

1045

3 16

638

427

732

239

570

667

497

225

325

000

wSSwSSsampww 3 13

642

1035

479

973

550

805

321

622

440

494

381

384

3 45

267

681

5 36

6 57

757

4 34

352

782

469

640

603

845

697

7 36

22 10

2437

21 90

1760

14 10

1590

1350

2325

27 70

2480

21 20

2350

5 70

aw Elvlaquoon

16266

16092

15441

16479

16069

14661

16376

15146

16160

16310

14036

14 07

HI 31

16179

16022

1C222

16622

16466

16413

1665

16020

16772

1laquo0raquo7

gigSSSSjS

16474

16167

14raquo01

16462

16146

16616

1617

16712

16636

16669

16407

16146

16626

16616

161M

16266

16167

16636

16004

16363

16026

16706

16366

16346

16437

16067

16232

16166

13646

13214

13634

14066

14560

14333

14366

13367

12666

13167

13662

13600

16260

031497

Depth

to Water

740 040 4 41 4 38

025

1276

727

573

789

746

1830

1038

3 13

631

4 13

720

250

674

576

633

233

3 4 4

000

SJSS SSsiiS

321 663

1033

493

972

566

809

342

627

456

5 18

457

402

363

327

7 10

575

675

750

520 335

803

481

650

6 15

846

707

737

1980

2330

2245

1635

1385

1585

15 10

21 55

25 15

2470

2065

2270

553

QW

deration

16233

16OS2

16423

16448

1054

14673

16366

16307

16166

16127

14030

14614

16134

16166

16O36

16234

16611

16361

16604

16623

16012

16763

16067

iilslSissW 16466

16136

14603

16446

16146

1649

16176

16661

16633

16643

16363

1070

16607

16600

16134

16266

16166

16616

16011

16267

16042

16666

16373

16336

16426

16066

16222

16166

13776

13321

13476

14164

146O6

14336

14206

13637

13163

13177

13717

13660

16267

032197

Depth

to Water

705 000 396

385

000

1271

686

7 14

745

5 32

1845

1038

2 77

596

388

7 14

1 94

654

562

490

1 95

3 16

000

304

639

1025

463

955

535

791

324

6 17

4 14

485

4 10

387

334

283

680

553

643

725

456

3 12

745

454

623

583

828

685

7 17

2035

2305

21 55

1740

14 10

1570

1565

22 10

2585

2400

21 20

2335

530

aw euvttton

16266

16132

16466

16601

16O76

14676

163raquo7

16166

16202

16341

14016

14614

16170

16221

16061

16240

16667

16361

16616

16666

16060

16761

16097

16483

16160

14911

16478

16163

16630

16193

16709

16643

16686

16416

16117

16622

16620

16178

16286

16180

16960

16036

16361

1SO6S

16743

16400

16362

16467

16104

16244

16186

13721

13346

1366

14079

14680

14363

14161

13482

13083

13247

13662

13616

16320

032897

Depth

to Water

706 000 406 387 000

1268

700

740

7 78

547

1877

1052

3 15

637

4 17

7 15

203

665

572

4 95

2 10

322

000

1 ^W$ 3 16

650

1039

472

963 547

801

332

621

423

495

452

397

347

304

680

574

633

737

4 70 326

761

470

629

583

838

675

725

20 10

2330

21 40

1655

1360

1550

1605

2220

2525

2435

21 45

23 15

560

aw Elention

16267

16132

16468

16499

16079

14681

16383

16140

16169

16326

13983

14800

16132

16180

16032

1623

16668

16370

16608

16661

1036

16776

16087

iHamplfW 16471

16149

14697

16469

16166

16618

16183

16701

16639

16676

16406

16076

16612

16616

16167

16286

16169

16960

16024

16347

16061

16727

16384

16366

16467

16094

16264

16177

13746

13321

13684

14164

14630

14373

14111

13472

13143

13212

13637

13636

16290

033197

Depth

to Water

6 70 0 00 382

350

000

1230

664

703

736

5 11

1833

10 15

297

604

392

681

1 72

623

528

453

1 86

294

000

IteSifc 291

6 13

1002

431

921

506

772

298

594

387

4 63

4 17

361

3 12

2 72

645

530

601

696

438

301

727

432

557

552

801

638

687

2020

23 25

2080

1605

14 10

1575

1625

21 85

2505

2455

2095

2290

520

aw EUraUon

16303

16132

16482

15636

16079

14719

16419

15177

15211

16362

14027

14837

16160

16213

16057

16273

16669

15412

1SSS2

15603

16059

15803

16097 bullbullbullbull vgtltV-shy

15496

15186

14934

16610

15197

15669

15212

15736

15666

15612

16438

15110

15648

15661

15189

16321

16203

15992

15065

16379

16076

16761

15422

15428

15488

15131

15291

15215

13738

13326

13644

14214

14680

14348

14091

13607

13163

13192

13687

13660

15330

bull - For Information only not required by Demonstration ol Compliance Ran (BBampL June 1995)

0 = Static water level at casing

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

TABLE 2

SRSNE SITE NTCRA 1

GROUNDWATER CONTAINMENT AND TREATMENT SYSTEM

Total Gallons Time Elapsed Average Flow Rate Totalizer Flow Since (Days) (Gallons per Minute)

Date Time Meter Reading Previous Reading

Since Previous Cumulative Since Previous Cumulative Thousands Thousands Reading Reading of Gallons of Gallons

INFLUENT FLOW RATE DATA

3797 0900 17607 183 7 593 1930 2063

31497 0900 17848 241 7 600 2391 2067

32197 1000 18091 243 7 607 2396 2071

33197 0800 18430 339 10 617 2374 2076

EFFLUENT FLOW RATE DATA

3797 0900 18092 205 7 593 21 62 21 20

31497 0900 18332 240 7 600 2381 2123

32197 1000 18580 248 7 607 2446 21 27

33197 0800 18932 352 10 617 2465 21 32

Note The difference between the total influent and effluent flow is due to backwashing the sand filter and carbon units with potable water

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

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CO

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CO

CO Q Tl

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CO o

CO ro to

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01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

TABLE 3 SRSNE SITE

NTCRA 1 GROUNDWATER CONTAINMENT AND TREATMENT SYS rEM

INFLUENT SAMPLING RESULTS

Concentration (mgl) Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

tylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

1 2-Dichloroethene

12-Dichloroethane

111-Tnchloroethane

11 2-Tnchloroethane

Methylene chloride

Sty re n e

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Notes 1 mql = milligrams per liter

3597

0065

lt0050

51

1 4

11

088

0081

J 014

52

lt0050

11

lt0050

B O 42

lt0050

lt5

lt5

lt5

lt5

037

053

029

lt0025

974

lt0005

lt004

lt0025

32097

014

J O 032

4 3

1 4

1 0

065

0066

lt0050

43

lt0050

1 6

lt0050

B015

lt0050

lt5

lt5

lt5

lt5

J 019

lt025

017

lt0025

11 6

lt0005

lt004

lt0025

2 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level

3 B = parameter detected in the laboratory method blank 4 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

~ ro PL 01

CO

CJI

CO

CO Q Tl

I N ro o cn

CO o

CO ro to

O ltB 3 O CD

CD

CO 01

01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

TABLE 4 SRSNE SITE

NTCRA 1 GROUNDVWTER CONTAINMENT AND TREATMENT SYSTEM

Parameter

A Organic Parameters

Volatile Organic Compounds

Trichloroethene

Tetrachloroethene

Toluene

Ethylbenzene

fylenes Total

Vinyl chloride

11-Dichloroethene

Tetrahydrofuran

12-Dichloroethene

12-Dichloroethane

1 1 1 -Trichloroethane

1 1 2-Tnchloroethane

Methylene chloride

Styrene

Alcohols

Ethanol

Methanol

2-Butanol (sec-Butanol)

2-Propanol (Isopropanol)

Ketones

Acetone

2-Butanone (Methyl Ethyl Ketone)

4-Methyl-2-pentanone (Methyl Isobutyl Ketone)

B Inorganic Parameters

Metals

Copper Total

Iron Total

Lead Total

Nickel Total

Zinc Total

Other

Total Suspended Solids (TSS)

Peroxide

pH (SU)

DioxmsFurans

Total PCBs

Notes 1 mql = Milligrams per liter 2 SU = standard units

EFFLUENT SAMPLING RESULTS

Substantive Requirement Concentration (mgl) Discharge

3597 32097 Limits (mql)

0973 lt0010 lt0010

0106 lt0010 lt0010

40 lt0010 0011

10 lt0010 lt0010

05 lt0010 lt0010

45 0023 0027

0058 lt0010 J 0006

05 lt05 lt005

50 1 208 0985

025 J0010 0011

40 018 017

025 lt0010 lt0010

150 B 012 B010

05 lt0010 lt0010

200 lt5 lt5

300 lt5 lt5

100 lt5 lt5

100 lt5 lt5

350 019 016

100 0075 0056

20 lt0030 lt0030

158 gday lt218 lt360

50 1 75 212

3 2 gday lt044 lt072

050 lt004 lt004

40 3 gday lt218 lt360

300 lt40 lt40

10 04 06

6 0 - 9 0 692 674

NL NS NS

NL lt47 NS

unless otherwise noted

3 J = denotes an estimated value less than the Laboratorys Practical Quantitation Level 4 B = parameter detected in the laboratory method blank 5 NL = no limit specified 6 NS = no sample (total PCBs analysis required monthly dioxmfuran analysis required quarterly) 7 ND = parameter not detected at analytical method detection limit 8 = 12-Dichloroethene represents cis and trans 12-Dichloroethene

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

oo

Ol

CO

to O

H H

c m0)

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CO

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CO

CO Q Tl

I N ro o cn

CO o

CO ro to

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CD

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01

CO

O)

CO

CO o Tlfgt 01

V o Tl N 6)

Parameter 3597 31497 32097 32797

Peroxide (mgl) 0 4 04 06 0 4

pH (SU) 692 668 674 682

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

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CO

to O

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V o Tl N 6)

Figures

Original includes color coding

GROUNDWATER ELEVATION (ft)

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I I I

01shy

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CO o

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CO o Tlfgt 01

V o Tl N 6)

Original includes color coding

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

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CO

to O

H H

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CD

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V o Tl N 6)

GROUNDWATER ELEVATION (ft)

CO O1 Ul O) CD en o O1 O Ol o Ol

I I I

01shy

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CO

to O

H H

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