Donald Campbell Project Manager

287 Maspeth Road, Brooklyn, NY 11211 T: 718.963.5453 ■ F: 718.963.5611 ■ donald.campbell@us.ngrid.com ■ www.nationalgrid.com

July 20, 2009 Henry Willems Environmental Engineer New York State Department of Environmental Conservation 625 Broadway Albany, New York 12233-7014 Re: Remedial Investigation Work Plan Addendum Fulton Municipal Works Former Manufactured Gas Plant (MGP) Site Brooklyn, New York Site No. 224051 Index No. A2-0552-0606

Dear Mr. Willems: National Grid is submitting for your review and approval the following Remedial Investigation (RI) Work Plan Addendum to conduct RI field activities within public street rights of-way (ROWs) in the vicinity of the Fulton Municipal Works former Manufactured Gas Plant (MGP) site in Brooklyn, New York (Site). National Grid has prepared this work plan based upon discussions with you in order to further evaluate the nature and extent of off-site dense non-aqueous phase liquid (DNAPL) tar impacts within subsurface soils adjacent to the Fulton Municipal Works MGP Site. The proposed sample locations are provided in Figure 1. 1.0 RI Addendum Scope of Work National Grid and its contractors have completed the majority of RI sampling activities that were proposed as part of the New York State Department of Environmental Conservation (NYSDEC) and New York State Department of Health (NYSDOH)-approved RI Work Plan entitled Final Remedial Investigation Work Plan Fulton Municipal Works, Former Manufactured Gas Plan Site, Brooklyn, New York ACO Index No A2-0552-0606, Site # 224051, dated March 2008. A preliminary review of RI soil boring information reveals that DNAPL tar impacts were encountered adjacent to the Site within and beneath public street ROWs, as well as two private properties immediately adjacent to the Site. This RI Work Plan Addendum proposes the installation of six soil borings to evaluate the DNAPL tar impacts in subsurface soil and three groundwater table monitoring wells to evaluate groundwater flow and conditions in the vicinity of the Site (Figure 1).

The RI activities will be conducted in accordance with the NYSDEC and NYSDOH-approved RI Work Plan including the Health and Safety Plan (HASP), Quality Assurance Project Plan (QAPP), and Field Sampling Plan (FSP). The remainder of this letter describes the proposed soil borings, subsurface soil analysis, monitoring wells, and groundwater analysis.

Remedial Investigation Work Plan Addendum Fulton Municipal Works Former Manufactured Gas Plant (MGP) Site Brooklyn, New York July 20, 2009 Page 2

287 Maspeth Road, Brooklyn, NY 11211 T: 718.963.5453 ■ F: 718.963.5611 ■ donald.campbell@us.ngrid.com ■ www.nationalgrid.com

1.1 Soil Boring Installation Six soil borings (FW-SB-37 through FW-SB-42) are proposed within the adjacent street ROWs of Union Street (to the south), Douglass Street (to the east), and Butler Street (to the north). The proposed soil boring locations are shown in Figure 1. The purpose of the borings is to evaluate DNAPL tar impacts encountered as shallow as 10 feet below ground surface (bgs) in FW-SB-28 located within the Douglass Street ROW to as deep as 96 feet bgs in FW-MW-10 located on a private property adjacent to Gowanus Canal. Actual drilling locations will be determined based upon the subsurface utility clearance activities. The borings are proposed to be installed with a Geoprobe® drill rig in general accordance with drilling methods and procedures in the FSP and RI Work Plan. Soil samples will be collected and logged continuously from each boring. Drilling will proceed approximately 10 feet into soils that are visually un-impacted by MGP-related materials. If no apparent MGP-related impacts are observed at a particular adjacent boring location, the boring will terminate at the approximate elevation of impacts present in an adjacent boring. Two soil samples per boring will be selected for chemical analysis as summarized in Table 1. One soil sample will be collected from soils that exhibit the greatest apparent impact at the approximate elevation of observed impacts within subsurface soils in a nearby soil boring. If no tar impacts are encountered then a sample will be collected at the approximate elevation of the impacts observed in the adjacent boring. The second sample will be collected below the observed impacts or at the completion of the boring. The RI work plan and QAPP detail the quality assurance/quality control (QA/QC) samples that will be collected. Following the collection of subsurface soil samples, each soil boring will be abandoned by tremie grouting the boring from the bottom of the boring to the top, in general accordance with the FSP and RI Work Plan. Drilling equipment (i.e., drilling rods, auger, casing, and/or macro-core sampler) will be decontaminated between each sample location. Soil cuttings and decontamination fluids will be contained within United States Department of Transportation (USDOT) 55-gallon drums and disposed of at a National Grid-approved disposal facility. A Community Air Monitoring Plan (CAMP) will be implemented at the Site during intrusive field activities. 1.2 Monitoring Well Installation Three monitoring wells (FW-MW-18 through FW-MW-20) are proposed to evaluate the groundwater table conditions to the north and south of the Site (Figure 1). The monitoring wells will be installed using a conventional tracked hollow stem auger rig. The wells will be constructed as water table monitoring wells as specified by the RI Work Plan and will include a

Remedial Investigation Work Plan Addendum Fulton Municipal Works Former Manufactured Gas Plant (MGP) Site Brooklyn, New York July 20, 2009 Page 3

287 Maspeth Road, Brooklyn, NY 11211 T: 718.963.5453 ■ F: 718.963.5611 ■ donald.campbell@us.ngrid.com ■ www.nationalgrid.com

2-inch-diameter poly vinyl chloride (PVC), 0.010” slotted screen that is 10 feet long and 2-inch PVC riser to the surface. A 2-foot sump will be installed at the bottom of the well if soils exhibit potential recoverable DNAPL in the monitoring zone. The monitoring wells will be developed in general accordance with the FSP and RI Work Plan. Development waters will be contained within USDOT 55-gallon drums and disposed of at a National Grid-approved disposal facility. 1.3 Groundwater Sampling and Gauging The monitoring wells will be gauged and sampled in general accordance with the FSP and RI Work Plan. Prior to sampling, two synoptic rounds of groundwater level measurements at high and low tide will be recorded for the newly installed and existing monitoring wells and an established surface water measuring point on the Gowanus Canal. The monitoring wells will be purged and sampled after a minimum of two weeks following completion of well development using low flow groundwater sampling procedures and in general accordance with the FSP and RI Work Plan. Groundwater samples will be tested for the analyses provided in Table 1. Development waters will be contained within USDOT 55-gallon drums and disposed of at a National Grid-approved disposal facility. 1.4 Survey The sample locations will be surveyed by a New York State Licensed Land Surveyor. The elevation of each sample location will be determined to ±0.01 foot and will be tied into the Site benchmark. All locations and elevations will be referenced to the New York State Plane Eastern Zone North American Datum 1983 and North American Vertical Datum 1988. 1.5 Data Validation and Management The soil and groundwater samples will be analyzed by TestAmerica- Connecticut which is a NYSDOH environmental lab approval program accredited laboratory. TestAmerica will provide analytical results in a New York State Category B data deliverable format. The data will be validated in accordance with New York State Analytical Service Protocols and a data usability summary report will be prepared documenting the adequacy of the analytical data obtained from the laboratory and discussing any pertinent data excursions or limitations on the use of the data.

mailto:donald.campbell@us.ngrid.com

Table 1Sample Descriptions, Rationale, and Analysis

Remedial Investigation AddendumFulton Municipal Works MGP Site

Brooklyn, New York

X

als

es

1 s

H:\WPROC\Project\KEYSPAN\FultonMGP_RI081190\Off‐siteInvestigation\RI Addendum\Table 1 Proposed Sampling Analysis Fulton SRI Addend1.xls1 of 1 H:\WPROC\Project\KEYSPAN\FultonMGP_RI081190\Off‐siteInvestigation\RI Addendum\Table 1 Proposed Sampling Analysis Fulton SRI Addend1.xls1 of 1

tTo the north of FW 36 and FW MW

X

X

Sample I.D. Sample Location Sample Location Rationale SSoil

Numb

Grou

er of

ndw

Samp

ater

les

VOC

s (E

PA

ampl

8260

B)

SVO

Cs

(EPA

82

70C

)

TAL

Met

(600

0/70

00)

Pest

icid

(EPA

80

81A

)

Cya

nide

Her

bici

de(8

151A

)

e Depth

Subsurface Soil Borings and Monitoring Wells

FW-SB-37FW-MW-1

/8

Northern Side of Union StreeWay (ROW)  /

[To the southwest of theFormer MGP site]

t Right‐of‐

 Fulton 

To the southwest FWMW‐02, to evaluatebetween the  depth

below ground 

‐MW‐01 and FW‐ tar impacted soils s of  30 to 66 feet surface (bgs)  

At greatest oobserved imGroundwate

bservpacts r 

ed impact at the end of 

sample collectedwater table.

/beneath boring.   at the 

2 1 X X X X 2 X2

FW-SB-38

Northern Side of Union Strenear the intersection of Nev

[To the southwest of theFormer MGP site]

et ROW ins Street.  Fulton 

To the southwest FWMW‐02, to evaluatebetween the  depth

below ground 

‐MW‐01 and FW‐ tar impacted soils s of  30 to 66 feet surface (bgs)  

At greatest oobserved im

bservpacts 

ed impact at the end of 

/beneath boring.

2 0 X X X X

FW-SB-39

Northern side of Douglass Stin the vicinity of 3rd Ave

[To the northeast of the FultMGP site]

reet ROW nue. on Former 

To the east of FW‐SBimpacted soils at app

bgs

‐36 to evaluate tar roximately 49 feet .

At greatest oobserved im

bservpacts 

ed impact at the end of 

/beneath boring.

2 0 X X X X

FW-SB-40Southern side of Butler Stre[North of the Fulton Former 

et ROW/MGP Site]

To the north of FW‐S08 to evaluate tar

between approximfeet 

B‐36 and FW‐MW‐ impacted soils ately  34 and  55 bgs.

At greatest oobserved im

bservpacts 

ed impact at the end of 

/beneath boring.

2 0 X X X X

FW SB 41/FW-SB-41FW-MW-1

Within the Butler Street ROt f N i St/

9east of Nevins Stree

[To the north of the FultonMGP site]

W to the t

To the north of FW‐S. Former 

SB08 to evaluate tarbetween 10 and

B‐36 and FW‐MW‐At greatest ob d i t

 impacted soils  65 feet bgs.

observed imGroundwate

bservpacts r 

ed impact t th d fat the end of 

sample collectedwater table.

/beneath b iboring.   at the 

2 1 X X X X 2 X2

FW-SB-42FW-MW-2

/0

Within the Butler Street ROwest of Nevins Street. [T

northwest of the Fulton Forsite]

W to the o the mer MGP 

To the northeast oevaluate tar im

encountered at apprbgs

f FW‐MW‐10 to pacted soils oximately 96 feet .

At greatest oobserved imGroundwate

bservpacts r 

ed impact at the end of 

sample collectedwater table.

/beneath boring.   at the 

2 1 X X X X 2 X2

Notes:Chemical analysis test methods specified are from U.S. EPA SW‐846 test methodsEPA ‐ Environmental Protection AgencyVOC ‐ volatile organic compoundsSVOC ‐ semivolatile organic compounds TAL ‐ target analyte list1 ‐ Soils will be analyzed by Free Cyanide [extraction by EPA Method  9013A/ and analysis by Microdiffusion American Society for Testing and Materials (ASTM) Method D4282‐02] Groundwater will be anlayzed by EPA 9012A and Free Cyanide.2 ‐ Soils will not be analyzed for herbicides or pesticides.

BUTLER STREET

BO

ND

STR

EET

SACKETT STREET

DEGRAW STREET

NEV

INS S

TR

EET

GO

WA

NU

S C

AN

AL

GAS HOLDER

GAS HOLDER

COAL SHED

PURIFYINGHOUSE

OXI

DIZI

NG S

HED

PURIFYINGHOUSE

METERHOUSE

GASOMETER

TAR SEPARATORTANK (ON TRESTLE)

HOISTINGENGINE

SALT WATERPUMPS

PUMP ROOM

OFFICE METERHOUSE

IRON OXIDESHEDSLIMEHOUSE OXIDIZING SHED

SAW

DUSTCO

AL B

IN

SAW

DUST

OXIDESTORAGE SHAVINGSSTORAGE

CONDENSERHOUSE

COAL SHED

GENERATORS

GENERATORHOUSE

CONDENSERHOUSE

OIL TANK

RETO

RTHO

USE

TAR OILTANKS CARBURETTERS

OILROOM

BLOWERS

ENGINEHOUSE

OILPRESS

CATCHBASIN

GASOLINEHOUSE

HYDROGENTANK

OIL TANKIN CONCRETE

BASIN

OIL/PURGETANK

OIL TANK

GAS

OIL

NAPH

THA

TANK

S

PIPESHOP

STORAGE

BLOCK 419LOT 1

BLOCK 426LOT 17

BLOCK 425LOT 1

BLOCK 426LOT 1

BLOCK 426LOT 49

FW-SB-12

FW-SB-13

GOVERNORHOUSE

FW-IA-03

FW-IA-05

FW-IA-06

FW-SV-11

FW-SV-12

FW-SV-13

FW-IA-04FW-SB-11

FW-SV-06

FW-SV-07

FW-SV-05

FW-SB-16

BLOCK 418LOT 1

BLOCK 432LOT 15

FW-SS-07

FW-SB-34

FW-SB-33

FW-MW-15

BLOCK 420LOT 1

BLOCK 420LOT 58

FW-SB-40

FW-SB-39

FW-SB-38

FW-SB-41/FW-MW-19

FW-SB-37/FW-MW-18

FW-SB-42/FW-MW-20

UNION STREET

BUTLER STREET

NEV

INS S

TR

EET

3R

D A

VEN

UE

GO

WA

NU

S C

AN

AL

DOUGLASS STREET

FW-TP-07

FW-TP-08

FW-TP-04

KSF-SB-24

KSF-SB-22

KSF-SB-20

KSF-SB-19

KSF-SB-28

KSF-SB-29

KSF-SB-14/MW-2

GC-GP-06

KSF-SB-21/MW-7

KSF-SB-25

FW-TP-06

KSF-SB-27/MW-4

KSF-SB-13

KSF-SB-11

KSF-SB-10

KSF-SB-09

FW-SB-29

FW-SB-10

FW-SB-23

FW-SB-21

FW-SB-19

FW-SB-18

FW-SB-17B

FW-SB-17

FW-SB-35

FW-SB-27

FW-MW-09

FW-MW-16

FW-MW-06FW-MW-07

FW-SS-05

FW-SS-08

FW-SS-09

FW-SB-17A

FW-TP-05

FW-MW-1R

KSF-SB-23/MW-1

FW-SV-04

FW-OA-01

FW-SB-36

FW-SB-30FW-SB-28

FW-SB-25

FW-SB-31

FW-SB-32

FW-SB-26

KSF-SB-08

KSF-SB-07

KSF-SB-02

KSF-SB-01

KSF-SB-06

FW-SS-04

KSF-SB-18

FW-MW-08

FW-SB-24

KSF-SB-03

KSF-SB-04

KSF-SB-05

FW-SB-22

FW-SB-20

FW-SV-10

KSF-SB-17/MW-6

KSF-SB-16

FW-MW-5R

KSF-SB-15/MW-5

FW-MW-05

FW-SB-15

FW-MW-12FW-SB-12

FW-MW-13

FW-SB-13

FW-MW-14

FW-SB-14*

FW-SV-09

FW-SV-08

FW-TP-03

FW-MW-04

FW-MW-04R

FW-MW-03

FW-SB-09

FW-TP-02A

FW-TP-02B

KSF-SB-12

FW-MW-10FW-SB-10

APPROXIMATE BOUNDARY OF FORMERMANUFACTURED GAS PLANT (MGP) SITE

PROPOSED RIA SOIL BORING/MONITORING WELL LOCATION

PROPOSED RIA SOIL BORING LOCATION

APPROXIMATE CURRENT PROPERTYBOUNDARY

FW-SB-40

FW-SB-41/FW-MW-19

KSF-SB-24

KSF-SB-23/MW-1

PREVIOUS SAMPLES

GC-GP-06

NEW YORK STATE DEPARTMENT OFENVIRONMENTAL CONSERVATION(NYSDEC) SITE CHARACTERIZATION (SC)BORING LOCATION

KEYSPAN GOWANUS CANALINVESTIGATION BORING LOCATION

RI SOIL VAPOR POINT

RI SOIL BORING WITH TEMPORARYGROUNDWATER SAMPLE LOCATION

REMEDIAL INVESTIGATION (RI)MONITORING WELL LOCATION

RI SOIL BORING LOCATION

REMEDIAL INVESTIGATION SAMPLES

RI INDOOR AIR SAMPLE LOCATION

FW-SB-20

FW-SB-01

FW-MW-01

FW-SV-10

FW-IA-01

FW-SS-06 RI SURFACE SOIL SAMPLE LOCATION

FW-OA-01 RI OUTDOOR AIR SAMPLE LOCATION

NYSDEC SC MONITORING WELLLOCATION

PROPOSED SOIL VAPOR POINT

PROPOSED SOIL BORING WITH TEMPORARYGROUNDWATER SAMPLE LOCATION

PROPOSED RI MONITORING WELL LOCATION

FW-IA-04

PROPOSED RI SOIL BORING LOCATION

PROPOSED REMEDIAL INVESTIGATION (RI) SAMPLES

FW-MW-15

FW-SB-12

FW-SV-06

FW-SB-11

FW-SS-07 PROPOSED SURFACE SOIL SAMPLE LOCATION

PROPOSED INDOOR AIR SAMPLE LOCATION

HISTORIC STRUCTURE

SAMPLE WAS NOT SURVEYED(LOCATION APPROXIMATE)FW-SB-14*

0

SCALE, FEET

120 240

.1. PHOTOGRAPH OBTAINED FROM BLUE SKY INTERNATIONAL LTD. ALL RIGHTS RESERVED.

COPYRIGHT 2006.

2. SANBORN FIRE INSURANCE MAPS (1886 THROUGH 1996).

3. SITE CHARACTERIZATION REPORT, FULTON FORMER MANUFACTURED GAS PLANT,BROOKLYN (II), KING'S COUNTY, NEW YORK, SITE No. 2-24-051, SEPTEMBER 2007, PREPAREDBY NYSDEC REMEDIAL BUREAU C., DIVISION OF ENVIRONMENTAL REMEDIATION.

4. NEW YORK CITY OPEN ACCESSIBLE SPACE INFORMATION SYSTEM http://www.oasisnyc.net,ACCESSED JANUARY 2008. July 2009

PROPOSED SAMPLE LOCATIONS

REMEDIAL INVESTIGATION WORK PLAN ADDENDUMFULTON MUNICIPAL WORKS FORMER MGP

BOROUGH OF BROOKLYN, NEW YORK

PROJECT 081190-2-1203 Plate 1455 WINDING BROOK DRIVE

SUITE 201GLASTONBURY, CONNECTICUT 06033

I:\GEI\National Grid\Fulton\WORK PLAN\ Fulton MGP PROPOSED SAMPLES 7-09.dwg \Jul 15, 2009