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FINAL

WORK PLAN AMENDMENT NO. 3

REMEDIAL INVESTIGATION/FEASIBIUTY STUDY

NYANZA OPERABLE UNIT Ill -SUDBURY RIVER STUDY MIDDLESEX COUNTY, MASSACHUSETTS

NUS Corporation

EPA Work Anignment No. 02-1 L 15 Contr•ct No. 68-WI-G117

NUS Job No. 0214

June 1991

t]j~p~!! GA Halliburton Company

W91076F

FINAL

WORK PLAN AMENDMENT NO ,

REMEDIAL INVESTIGATION/ FEASIBILITY STUDY

NYANZA OPERABLE UNIT III - SUDBURY RIVER STUDY

MIDDLESEX COUNTY, MASSACHUSETTS

NUS Corporation

EPA Work Assignment 02-lLlS Contract No. 68-WB-0117

NUS Job No. 0214

June 199 1

walter Martin .Geo~'~a~.EProject Manager Program Manager

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TABLE OF CONTENTS FINAL WOKR PLAN AMENDMENT NO. l

NYANZA OPERABLE UNIT III - SUDBURY RIVER STUDY MIDDLESEX COUNTY, MASSACHUSETTS

SECTION

l. 0 IIITRODOC'riON

2.0 OBJECTIVES

3.0 SCOPE OP-.< ].1 Sediment Reaampling 3.2 Surface Water Reaampling

4 . 0 SCIIEDOLE

5.0 PROJECT COSTS

6 . 0 IIQUIPIIEft ARD SUPPLIBS

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PROJECT SCHEDULE

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1.0 Ill'l'IIOilOCTION

This Final Work Plan Amendment Memorandum provides the scope and activities for the NUS ARCS I Team in carrying out additional work at Nyanza Operable Unit III, Middlesex County, Massachusetts. The work Plan dated Augus t 1989 and work Plan Amendment No. 2 dated October 1990 will be amended through this memorandum to incorporate details of the Phase II resampling program and associated additional sampling, and a deacr iption of the broadening of the risk aasessment scope. A brief description of the NUS ARCS I Team involvement in the Phase II resampling program and additional proposed sampling is included in this memorandum. This work will be carried out under Work Assignment 02-lLlS.

2. 0 OBJECTIVES

The Final Work Plan - Volume II (Augus t 1989) and t he Final Work Plan Aaendllent Memorandum No . 2 (October 1990) include ob jectives, scope and general activit i es to be conducted in this sample round . This uendaent further details the resampling program which include• •••pling at sixteen (16) locations to replace dAta thAt VAl rejected due to the failure to meet quAlity control criteria. Additional sampling will a lao be conducted at four ( 4) new supling locations .

3.0 SCOPE OP WR11

TASK 0100 - PROJECT PLANNING

The estiaate tor cost and level of effort (LOE) i n the Final Work PlAn (August 1989) and Work Plan Amendment No . 2 (October 1990) were re-evaluated . Changes in scope , schedules and additionAl activities associated with t he resamplinq program and the expanded scope of the risk assessment require an adjustment in cost and LOE. This amendment includes the additional effort required to complete this SAP Amendment No. 3, t he associated Work Plan Amendment and Cost Pricing Proposal.

TASK 0300 - FIELD INVESTIGATION

The Scope of work for Phase II activities is presented in the Final Work Plan Volume II, Section 4. 3 . 3. The Phase II resampling program includes sampling at a total of twenty ( 20) locations and is discussed below. This i ncludes resampling at sixteen (16) locations and the addition of tour (4) new locations . The resampling program i ncludes collecting sediment samples at all twenty locations and surface water samples at nine ( 9) of those locations .

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) .1 SecU•nt Resaapling

Section 4. 3. 3 . 3 in the Final Work Plan and Sect ion 3. 3 of the Work Plan Amendment No. 2,

Under this task, twenty (20) sediment locations will be sampled. Thia i ncludes resampling at 16 locations to replace sample data that was rejected due the failure to meet quality control criteria . Additional samples will be collected at four (4) new locations where the groundwater plume(s) from the Nyanza Site is projected to discharge to the Sudbury River (Ebasco, October 1990).

ruther110re, the interstitial water (water contained in spaces between sediment particles) will also be sampled at two sediment suplinq locations. Dedicated sample locations will not be required for this sampling. Interstitial water does not t ransfer freely out ot the sediment into the overlying surface water . Contuinants which have been adsorbed onto sediment particles can migrate troll the sediment to interstitial water where the contaainants can be ingested or adsorbed by the biota . As the interstitial water does not readily mix with the surface water, contaainants can be significantly elevated in this zone . Coaplex partitioning coefficients make calculating this partitioning an inexact aethodology. These results will be used for exposure ~·•••••nt calculations for benthic organisms.

ed.iunt aaaplea will be collected within the Sudbury River from Southville Pond, downstream through Reservoir No. 2. Additionally, one sediunt sample location will be collected in Reservoir No. 1, two aediaent sample locations in the river raceway, and two sediment sample locations in Chemical Brook Culvert.

Saaples will be collected from the sediment surface at all 20 locations (0 to 6 inches) and from 6 to 12 inches at 10 locations to provide i nformation about the vertical distribution of contaminants. Sample collection procedures outlined in the Final SAP (April 1990) will be followed . Sample locations and laboratory analyses tor each sample location are presented i n Figure lA (All) and Table 3-l(AIJ), respectively, of the SAP Amendment No. 3.

3.2 Surface Water Resaaplinq

Section 4.3.3.2 i n the Final Work Plan and Section 3.2 of the Wor k Plan Amendment No . 2.

Unde r this tas k, nine (9) surface water locations will be sampled during the Phase II resampling program. The 9 surface wa~er locations correspond with sediment sampling locations. This includes resampling at 6 locations to replace sample data that was rejected due the failure to meet quality control criteria .

.._}dditional samples will be collected from three ( 3) new locations

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(which correspond with sediment sample locations) where the groundwater plume(s) from the Nyanza Site . is projected to discharge to the Sudbury River (Ebasco, October 1990).

Samples will be collected within the Sudbury River from Southville Pond, downstream through Reservoir No. 2, Additionally, one surface water sample will be collected in Reservoir No , 1 and one (1) surface water sample location in the river raceway.

Surface water samples will be analyzed in the field for pH, specific conductivity and temperature. Sample locations and laboratory analyses for each sample location are presented in Figure lA (All) and Table 3-1 (All), respectively, of the SAP Amendment No. 3.

TASK 0500 - DATA EVALUATION

The large data baee collected over three years by several agencies is being auimilated and standardized. This effort continues, however, additional LOE will be required. This aaendaent i ncludes the additional effort required to coaplete the task,

TASK 0600 - RISK ASSESSMENT

The Scope of Work for the Riak Aeeeu•nt ia presented in the Final Work Plan, Voluae n, Section 4.6 (Auguet 1919). The Risk Aaaeaaaent conducted for the Nyanza III study will include both a Baeeline Public Health Risk Aeeeasment and a a.aeline Ecological Riak Aaaesaaent. Additional tasks to be added to the scope of work for the Nyanza III Rilk AsaesaiMnt are diacuseed below,

The Public Health Risk Aeaessment will include a separate hazard identification for all contaminants specific to Nyanza Site discharges (carcinogenic and noncarcinogenic) and for all other contaminants present in each reach of the river system. Risk characterizations will be performed for c hemicals of concern selected from both of these groups of contaminants.

As part of the Ecological Risk Assessment , NUS proposed using an aquatic community approach for assessing rhk to the aquatic environment. The community approach reduces the potential for underest imating or overestimating risks posed to aquatic species as compared to using site specific representative species. The Ecological Risk Assessment will provide a biomaqnification model which will identify the potential accumulative and magnification hazards which can affect ecological receptors of all levels of the food chain. Certain tertiary consumers shall be 1pecifically targeted for biomagnified concentrations.

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) ""'. 0 SCIII!DOLE

The detailed schedule provided here is based on prompt EPA approval of the Work Plan and SAP Amendments and RAS/SAS requests. The schedule is also based on a standard week laboratory analysis turnaround of samples. Serious delays due to inclement weather conditions effecting work in an open boat is not considered. Such an event may cause sampling to be postponed, A detailed Phase II resampling schedule is presented below.

PlanninCiJ/RAS-SAS Approvals April 22 - May 10

Sediment/Surface Water Sampling June 3 - June 11

Sample Analysis June 7 - July 12

June 11Demobilize All Field Personnel

Data validAtion July 8 - July 26

Delivery of Draft RI / Riak August 23 Aaaeaa•ent Report

A reviaed overall project tchedule ia illuatrated in Figure I.

• 0 PROJIIC'r C08T8

A detailed Coat Estimate Proposal with detailed back-up has been prepared under separate cover.

6.0 IIQOIPIUIIT AIID SUPPLIES

The following equipment and supply needs are anticipated during the performance of the Phase II resampling operations.

o Vehicles ( 2 and 4 wheel drive capability) o 12 to lS ft. Jon boat (or equivalent) with anchor o 10 to 30 horsepower marine motor o Lite jackets o Oars/paddles o Weighted tape and popper (SO ft. length) o Specific Conductivity/pH/Eh/temperature meter ( s) o Filtration apparatus (vacuum pumps , flasks, etc.) o Two-way radios o Photoionizat ion detectors with calibration kit (Photovac

Microt ip or equivalent) o Organic Vapor Analyzer with calibration kit, hydrogen

carrier gas (OVA-128 or equivalent)

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o Mercury Vapor Analyzer with calibration kit (Jerome Gold Film Mercury Analyzer or equivalent) Sampling equipment 1hand augers, ponar, sediment core retriever, Kemmerer sampler, etc.)

o Tool Kits o Compass o Caaera

Consumable Supplies

0 Health and Safety : Tyvek covera lls, rain gear , cotton work gloves, disposable gloves, dispoaable surgical gloves, nitrile/ butyl gloves, boot covers, hard hats, safety glasaes, gOCJgles, face shields, Firat Aid Kita, Full-face napirators with mercury vapor cartridges, electrolyte solution• (e . g:. Gatorade), Fire extinguisher, stretcher, portable eyewaah station.

0 oecontaJdnation Supplies: Tubs, brushes, spray bottles, detergent rin1e1 (e.g. Alconox), methanol, nitric acid, garbage baga, plaatic sheets, distilled and/or deionized water, alUIIlinUIII. foil.

0 !J:t::rs;.FE:t:;,= v;~~t:~~it~~~,~~h9b~9~~c~ip~~P~;:: water (HPLC, diatilled and/or deionized), preaervativea (ice, acids, basea), mixing bowls, trowels, apatulaa.

o Oocuaentation Su~liea: Loc)booka, fila, batteries, auple labels, pa1nt markers, clip boarda.

Miacellaneoua: Flagging, paper towels, filter paper, garden hoae, pH paper, polyethylene rope, wood and metal stakes, hand trucks, brush clearing tools, steel or fiberglass tapes in 100 foot length.

o Saaple Bottles : 40 ml VOA vials, 4, 8, and 32 ounce jars, 1 l1ter polyethylene bottles, 80 ounce jugs.

Note : The costs assoc iated with the acquisit i on of the above 1te11s are not i ncluded in the Detailed Cost Estimate for thia Work Piin Amendment .

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