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ORDAN CO ENGINEERS & 261 Commc•coal Sl rtf'VP 0 Bo~ 7050 SCIENTISTS Portland. Mame 04112

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2. 51

Octobo r 15 , 1987

Hr. Andrew K . Towt Central Hain e Power Co. Ed lion Drive Auausta , HE 04330

Dc11r Hr. Towt :

Central Haine Power Co. (CHP) hu requested E.C. Jord11n (Jordan) to prepare a propoul for a proaram of additional soil umplina (surhc.e and subsurhce) in and around ehetric:al equipment discovered in the scro~p area at th e f' , O'Connor stu. Tht: enc: lond propoul ("Propoted Electrical Equipment Soil Samplins Phn") include• a pbn detailtna the surface and subsurhce 1011 umplina proara11 and a tchedule for umple collection , analys~•· and report ina.

In .CC'Ordanc.e with your request, this ul'llpltna proaum hu been prepared for concurrent sublllitt<1l from Jordan to CMP, the Hdne DEP and the USEPA on Friday, October 16, 1987. The proaro1m has bun basf!d on the results of the pr~vious scrap .tre• soil umplins and h11s been desfaned to cottplete the delineation of PCB contamination in the scn1p lrflll in one sampli na event. The schedule provides for Ill rApid ASSessment or datA so th•t the findinas C:An be incorporued into the draft R1 rf!port for the F. O'Connor site due in Dec:en~ber 1987 ,

We look forw.trd to disc uning this prognm wi t h you . Pluse c11ll if you h•ve r omn1ent s or que stions.

Since r"' l y ,

Joh n D. Tewh ey Tf!chn ic:• l Dl rector

JDT:Ih

St1"ve Serian - EPA Cynthia Kuhns - Moline DEP l.u r y Brown - ECJ Bruce Fowler - ECJ P.tt IAnni - ECJ

10 l11Ua~~ Hondll

, I . - I ., . 1 •' .., ~ -.... ENGINEERS &

/i )\ ,.'!,:I 1 I \ jt. , ). SCIENTISTS

PROPOSED ELECTRICAL EQUIPMENT

SOIL SAMPLING PLAN

F. O'CONNOR SITE AUGUSTA, MAINE

PROPOSED ELECTRICAL EQUIPMENT

SOIL SAMPLING PLAN

F. O'CONNOR SITE AUGUSTA, MAINE

OCTOBER 11117

Prepared for

Central ~ain'e Power Co . Edison Drive

Au&ulta, ~Iaine 04336

E.C. JORDAN CO. PORTLAND, MAINE 04112

PROPOSED ELECTRICAL EQUIPMENT SOIL SAMPLING PLAN

TABLE OF CONTENTS

SECTlON TITLE PACE NO .

1.0 INTRODUCTION. 20 0

2o0 SCRAP AREA BACKGROUND. • • • • , • • , • • • • • • , , • • • • • . , 2

3o0 PROPOSED ELECTRICAL EQUIPMENT SOIL SAMPLING PLAN. 30

4oO SCHEDULE. • , • , , , • 60

LIST Or PIGUUS

FIGUIE TITLE PAGE NO.

2-1 Location of Electrical Components •

:) 3-1 Propoud Surhce Soil Sample Locations.

LIST or PIGUUS

TABLE TITLE PAGE NO.

3-1 Proposed Electrical Equipment Soil Samplin& Summary. o6

4-1 Propos<!d Electrical Equipment Soil Sampltn& Schedule. o7

PROPOSED ELECTRICAL EQUIPMENT SOIL SAMPLING PLAN

1.0 Introduction

Ehvated concentrations of PCBs were detected in soil samples collected beneath specific pil'ces of electrical equipment identified during the scrap removal operations performed at the F. O'Connor site in August, 1987. (See the "Scrap Removal Program Summary", October 1987.) As a result of these findings additional umpllna is necessary to define the vertical and horizontal extent of this point source contal'lination. This samplina phn pr\lsants a brief review of previous scrap area sampling results, provides a detailed phn for the proposed additional umpllna And analysis, presents a achadula for sample collection, laboratory analysts, and presentation of the ftndinaa to the Haine DEP and USEPA.

2.0 Scrap Ana Backaround

The u1110val of scrap materials (i.e., white aooda, shut IHtal, car bodies , e tc . ) from an area of the F. O'Connor site located north and aut of TWA III waa started on Auauat 4, 1987. Scrap removal operations continued throuah Auaust 12, 1987, with a total of 247 tons of acnp materials baina removed from the alta. Over the course of the scrap umov11l operation 11 p ieces of ahctrical aquipmllnt (potentially containin& oil) wera identified , and sampha of underlyina soil ware collected and umplad. Ftauu 2-1 illustrates th• locat ions of the electrical equipment in relation to the scrap rutarhla and TrAnsformer Work Ana 11.

Surface ao11 sa1111plina around tha scr11p materillh area prior to a nd Cotlll'llensurat e with the identification of the electricAl equipment at the site included:

Tour I &rid and arab umplu; tank removal composite samples; backaround (clean appurlng) surfue soil composite umpling; composite 11nd discrete samples of aoih benuth the 11 pieces of elect rica I equi1111ent,

The "Scrap Removal Progra111 Summary" (October 1987) provides complete details of the removal operations, samplina, and analysts. The results of the chemical analysis of these solls lndic11te that two pieces of electrical equi pment, EE-4 a nd EE-6, contained concentrations of PCBa (total aroclors) of 40,000 mg/ka and 35 mg/ka, respectively. Additionally, composite samples 2 and ) (whic h were collected from beneath electrical e~ipment EE-5,6, 7 and 8 and EE-3,4,9 And II) contAined PCB concentr11tions of , and 40,000 mg/ka e11ch. All remai nina umplea were essent ta II y free of PC contAIIi nat ion, and no elevated concentrations of polyaromatic hydrocarbons (PAllS) or chlorinated benzene COftlpounds (typical site-relAted cherllicllh) were detected.

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The concentrations of PCBs detected in th<' umples dictate the ne ed for additional sampli ng to more c:learly define the horizon ta l and ve r tical exten t of PCBa present tn the so t l i n these area. The detai h of the proposed samp l ing are presented in th e f o ll owing sections.

3.0 Proposed Ele c tri ca l Equipme nt Soil Sampling Plan

The objectives of the final phaae of aoil sampling a t the F. O'Connor aite are to: 1) identify specific pieces of electrical equipment whiC'-h represent point aour ces of PCB contamination in the scrap area; 2) ddine the aerial distribution of PCBs abo ut these point sour ces; a nd 3) define the vertical extent of PCB migration into the soil beneath the point sources. A consideut ion of the scrap area electricd equipment soil sampling is the timely sample collection, ana lysis, and · assessment of t.he data such that the results of this sampling program can be incorporated irtto the draft RI report for the F. O'Connot Site.

To accomplish the objectives of the scra p area electrical equipment so~l sampling proaram, three types of soil umples must be collected . These include point source samples, perimeter samples, and subsurface soil samples. The intention of uch of then samples and the scope of the samplina proaram ara described below:

Point Source Samples -a tot a l of 6 soil samples will ba collected from the surface soil beneath the followin& pieces of electrical equipment: EE-3, EE-5, EE-7, EE-8, EE-9, and EE-11, they will be analyzed for total PCB content. The sample results will complement tha data already aenerated 11 part of the scra p reTDOval soil samplins proaram (I.a., Comp-2 and COIIIp-3, and EE-1 , EE-4, and EE-6). This entire database will provide a means to adequately dete rmine which pieces of electrica l equipment discovered at tha site serve as PCB point sources.

Perimeter Samples- perimeter surface soil umples will be collected around e11ch point so urce (identified above) to define the ho r izontal bounds of PCB contamin11tion. Th e pe rimeter sampl es will be collected 11nd held for analysis depend en t upon the results of the point source sampllns program . An estimated number of eigh t perimeter umples will be collected during this samplina, the l ocations of wh ich are shown in Fi gu re 3-1. This perimeter umpling data wil l bf! supplemented with tha extensive database currently available tn this area (sea Ftaure 3-1) to asseas the distribution of PCBs in and around the electrical equipment.

Subsurhce Sot I SAmples - beneath each piece of elect rical equipr~ent

with a surface soil c.onC'cntr,..tton of greater th"n 5 ppm (total PCB), subsurface soil samplin& will be performed. The objeC'.t ive of the sa11pltna is to delineate the verttc•l mlsration of PCB-c.onuin i ng fluids in the soi l s bennath point sou rC' es. Subsurf,..c.e soil samples w1ll be c.olleC'ted at 1 foot vertic-al intervals until e non-df'tec.t (leu

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than 1 ppm} or bedrock condition is enc.ou ntercd. While it h evident that the scope of the aubaudace soil umpling program is contingent upon the findings of the s urface soil and perime ter soi l umple results, a total of 15 "conditiona l" subsurface soil samples lire eat tmatcd a s neceaury for this phue of the progum.

An es timated total number of 29 soil samplu (32, including duplicatu) will be co llected in the scrap area e lec trical e quipment soil umpling progum. Tab l e 3-1 au~~~mariun th e nWDbera of samples to be coll ect•d a nd analyud. Figure 3-1 illustrates the l oc.cion of aample point s .

Propolf:d Electrical Equipment Soil Sampling Su~~W~~ary

Sample Identification 1

EE-3, E£-5, EE-7 ££-8, EE-9, EE-11

Point Source

JSS 146 to JSS 152Perimeter 23

Subsurface ££-4, EE-6 ••••••" 1) aee Fiaun 3-t for sample locations 2) exact number of umplea conttnaent upon point source umph r•aulta 3) exac t number of samples continaent upon point source u111ple results and

perimeter aampl• results

tn an effort to economize on sample collection and to minimhe analysla time, all aoil samples (point so urce, conditional perimeter, and conditional subsurface) will be collected in one umplina event. Samples will be analyzed for TotPJl PCBs usina the acreenina procedure implemented durin& Tours l and 11 of th e site Rl. No Contract Laboratory Proaram (CLP) PAH sampling will be performed durina this progun1 since the results of the composite sampling of th e electrical equipment and of the background aoil samples i n the aru were comparable (see Scrap Area Program Summary) . Sample a nal yail will proceed in a logical progreuion from point sourc.e aamplu, to perimeter samples, to depth-specific s ubsurface soi l umples. Samples will be 11 nal yud on a 24-48 hour turn-around time bash at the Jordan Environmental Laboratory in Porthnd, Mlline. The proposed schedule for the sample collection, analysis, and reportin& is discussed in the following section.

4.0 Schedule

Table 4-1 preaents thr ac.h•dule for the Proposed Scnp Area Electrical Equipment Soil Sampling Progum. The tabla provides th• dllltea for umple collection , priority soil umpl• anAlysts, dAtPJ vAiidation/aueument, and a verbAl reporting of the findings to the EPA and the Maine OEP . Adherence to

this proposed prognm schedule will ensure that t he objectives o£ the soi l umplina program are attained and that the findings are incorporated into the December aubmittal of 1 draft RI r eport. Fina l preuntat t on o£ the sampli ng result& will be included i n the draft Rl repo rt.

Proposed Electric•! Equi pment Soil Sampling Schedule

Tuk Date Sample Collection October 30 Sa11ple Anlllyah (48 hour turnaround):

A) Point Sources November 2 8) PerilltU Novembe r 4 C) Subsurhce Nove111ber 6

Data Validation/Aueaament Nove11ber 11 Verbal report of findtna• Novembe r 12