SDMS DocID 000212922

8UPERFDND SITE IHTERIM CLOSE OUT REPORT

Cannons Engineering Corporation (CEC) Site

Bridgewater, Massachusetts

September 30, 1991
I. SUMMARY OF SITE CONDITIONS

Background:

The Cannons Engineering Corporation (CEC) facility is a seven

acre Site (CEC Bridgewater Site or Site) located in a small

industrial park in the western part of the Town of Bridgewater,

Massachusetts. It is one of four separate but related sites

which form the Cannons Sites Group. The others are Cannons

Plymouth in Plymouth, Massachusetts; Tinkham's Garage in

Londonderry, New Hampshire; and Gilson Road in Nashua, New

Hampshire. All four sites are being handled under one

enforcement effort.

The CEC Bridgewater Site is located in the southeastern portion

of the Town River watershed which has an estimated area of 56

square miles and feeds water supply wells for the towns of

Bridgewater, West Bridgewater, and Raynham. Hockomock Swamp

occupies a large portion of the watershed. Lake Nippenicket is

the largest surface water body located within 1 mile of the Site.

The nearest drinking water well, operated by the Town of Raynham,

is located 1.3 miles west of the Site on the shore of Lake

Nippenicket.

CEC first purchased the parcel of land at the Site in November,

1974. The property was developed by them to handle, store, and

incinerate chemical wastes. These activities occurred frequently

at the Site between 1974 and November, 1980 when operations at

the Site ceased after the Massachusetts Department of

Environmental Protection (MADEP), then the Department of

Environmental Quality Engineering (DEQE), revoked CEC's Waste

License citing document falsification and other waste reporting

violations. Over 700 drums and approximately 155,000 gallons of

liquid waste and sludge in bulk storage were left behind on-site

by CEC. Between 1980 and 1982, the MADEP and the United States

Environmental Protection Agency (EPA) conducted Site inspections,

performed sampling and analyses and confirmed the presence of

chemical contamination at the Site. Several tanks and drums were

also observed to be leaking. In order to alleviate the problem

of leaking contamination and wastes left on-site, the MADEP

performed a removal action at the Site. In October 1982, MADEP's

contractor, Jet Line Services, Inc., removed approximately

155,000 gallons of sludge and liquid wastes stored in tanks and

711 drums from the Site. A subsequent removal was conducted by

the Potentially Responsible Party Group (PRP Group) in June 1988.

The PRP Group removed from the Site the bulk contents of an

underground tank, a septic tank, 3 tanker trailers and small, 5

gallon or less, containers from laboratory and storage areas.

Remedial Planning Activities;

Based on information obtained during the Site inspections and the

sampling and analysis performed between 1980 and 1982, EPA

proposed the Site for inclusion on the National Priorities List
(NPL) in December 1982. The Site was listed on the NPL on

September 8, 1983.

Immediately following, EPA entered into a contract with Ebasco

Services, Inc. for the performance of a Remedial Investigation

(RI) for the Site which assessed the degree of on-site

contamination present in the air, soils, sediments, surface water

and groundwater. The RI was completed in May 1987 and had

detected contamination in all media, however significant

concentrations were present only in soil and groundwater as

summarized below.

Surface soil samples determined that several volatile and semivolatile organic compounds were present at 15 of 21 sampling

locations. The maximum concentrations of the most prevalent

volatile organics detected were 51,000 parts per billion (ppb)

benzene, 26,950 ppb toluene and 18,000 ppb chlorobenzene.

Maximum concentrations of the most prevalent semi-volatile

organics were 30,000 ppb bis(2-ethylhexyl)phthalate, 3,600 ppb 4-

methylphenol and 1,200 ppb phenol. Polychlorinated biphenyls

(PCBs) were detected at 11 of the sampling locations at total

concentrations ranging from 39 to 96,080 ppb. Pesticides were

detected at 6 of the sampling locations at low concentrations

with a maximum of 15 ppb.

Subsurface soil samples were taken at depths ranging from 2 to 22

feet and resulted in the detection of volatile organics in 19 of

28 samples at total concentrations as high as 531 ppb. Semivolatile organics were detected in only 6 samples at a maximum

total concentration of 6,493 ppb. The pesticide heptachlor was

found at very low concentrations (0.9 ppb) at 2 locations. No

PCBs were detected in any soils below 2 feet.

Groundwater results for the RI were obtained from 3 sampling

rounds of monitoring wells. Round 1 of the sampling occurred on

July 17 to 19, 1984; round 2 of the sampling occurred on August

22, 1984; and round 3 of the sampling on September 10 and 11,

1984. The presence and degree of volatile organic contamination

varied widely between wells and sampling events with total

concentrations ranging from 6 to 550 ppb. The maximum

concentrations found were 390 ppb xylenes, 350 ppb trans-1,2-

dichloroethene and 160 ppb ethylbenzene. Most wells showed total

volatile contamination to be less than 50 ppb. Semi-volatile

organic compounds were detected at low concentrations in 7 wells

in round 1, 9 wells in round 2 and no wells in round 3.

Phthalates were the principal semi-volatiles detected. PCB's and

pesticides were not detected in any of the sampling rounds.

Based on the orientation of data obtained, it was found that

contamination in the groundwater was associated with

contamination in the soils. A complete description of the Site
results and analysis can be found in the Remedial Investigation

(RI) report.1

Concurrent with the RI, an Endangerment Assessment (EA)2 was

conducted by Ebasco Services, Inc. to assess potential threats to

public health, welfare, and the environment resulting from

contamination at the Site. The EA was based on data collected

during the RI and served as a baseline risk assessment.

The information and data obtained during the RI and EA were used

to develop a Feasibility Study (FS)3 which initially screened a

field of alternatives for remediation and then carefully

evaluated several of the more feasible alternatives as required

under the National Contingency Plan, 40 CFR Part 300, and Section

121 of the Comprehensive Environmental Response, Compensation,

and Liability Act (CERCLA). As a result of the final FS, which

was complete in January of 1988, the nine evaluation criteria,

found in EPA guidance document "Additional Interim Guidance for

FY '87 Records of Decision" dated July 24, 1987, were used to

compare and analyze the following Source Control (SC) and

Management of Migration (MM) alternatives:

(SC-1) Minimal No Action, Restrict Access

(SC-2) On-site cover system

(SC-3) Solidification and Stabilization, On-site RCRA

landfill/Off-site incineration

(SC-4) Solidification and Stabilization, Off-site RCRA

landfill/off-site incineration

(SC-5) On-site Aeration/Off-site incineration

(SC-6) On-site incineration

(SC-7) Off-site incineration

(MM-1) No Action with Monitoring

(MM-2) Pump and Treat by UV-Photolysis/Ozonation

(MM-3) Pump and Treat by Air Stripping

(MM-4) Pump and Treat by Carbon Adsorption

(MM-5) .Pump and Treat by Reverse Osmosis

(MM-6) Pump and Treat by Air Stripping/Activated Carbon

(MM-7) Pump and Treat Off-site

1The Remedial Investigation, Feasibility Study, Endangerment

Assessment, Record of Decision, and all other documents used in

support of the remedial action decision process are compiled in

the CEC Bridgewater Site Administrative Record and are available

for review by calling the EPA Region 1 office at (617) 573-5729.

The Administrative Record is also available for review at a Site

repository which exists at the Bridgewater Public Library.

2See footnote 1.

3See footnote 1.
On February 11, 1988, EPA held an informational meeting with the

public to discuss the above clean-up alternatives which were

presented in the (FS) and announce the Agency's Proposed Plan for

remediation. A three week public comment period was initiated at

that time to accept written comments on the alternatives and

selected remedy. A public meeting was then held on February 25,

1988 to solicit any oral comments. Responses to all comments

received were documented and can be found in the Responsiveness

Summary portion of the Record of Decision*.

On March 31, 1988, EPA's Regional Administrator issued a Record

Of Decision (ROD) documenting the selected remedy for the Site

which was a combination of alternatives (SC-1), (SC-3), (SC-5)

and (MM-1) to include both source control and management of

migration components.

In summary, the source control portion of the remedy provided for

fencing the entire Site area to restrict access, on-site thermal

aeration of soils contaminated with volatile organic compounds

(VOCs) to levels established after additional sampling, and offsite incineration of PCB contaminated soils in excess of 9 ppm.

In addition, buildings and tanks on-site were to be

decontaminated and removed and soils under those structures,

along with other soil locations, were to be sampled. Any

contaminated soils that were determined to require treatment

based on a threat to human health and the environment were to be

remediated by one of the selected soil treatment technologies.

The management of migration portion of the remedy includes a

groundwater monitoring program to assure that contamination above

the Maximum Contaminant Levels does not migrate off-site and to

assure that contaminant levels on-site naturally attenuate. It

is estimated that groundwater cleanup target levels, based on the

ingestion of on-site groundwater, will be achieved within 15 to

20 years. The management of migration remedy also requires that

institutional controls restricting the use of groundwater be

placed on the Site. For a description of the institutional

controls, see section IV of this report.

As required in the ROD, in December 1988 the Cannons Sites

Potentially Responsible Party Group (PRP Group) retained a

contractor to conduct a pre-design study sampling program to

further define the contaminated areas as outlined in the ROD.

The Pre-Design Study Report, which documents the full extent of

contamination at the Site, was approved by EPA in February 1989.

The data collected during the pre-design study sampling program

was evaluated in the Remedial Design Report, January 1990, from

which remedial design excavation levels were established. A

4See footnote 1.
Consent Decree with the PRP Group became effective on August 14,

1989 under which, in January 1990, the PRP Group completed the

Remedial Design and Remedial Action Work Plan. EPA approved the

final Work Plan for the Site in February, 1990. Remedial design

and actions were conducted by the PRP Group with EPA and MADEP

oversight.

Remedial Construction Activities;

As required in the ROD, fencing of the Site perimeter to restrict

uncontrolled access was completed in December 1988.

As part of the Remedial Design, an asbestos inspection was

conducted on-site. Asbestos-Containing Materials (ACMs) were

found in several of the buildings. .To assure worker

protectiveness, abatement of the ACMs was initiated on December

2, 1989, prior to any demolition activities. All ACMs were

double bagged and drummed or crated for subsequent off-site

disposal at Chemical Waste Management's Model City, New York

Landfill. The abatement of ACMs was performed in accordance with

all applicable regulations and post-sampling confirmed air

quality was within acceptable standards. Following a brief

period of on-site storage, off-site disposal of all ACMs was

complete on April 25, 1990.

Decontamination, demolition and disposal of all on-site

structures, including buildings, storage tanks, piping and an

electrical transformer, was initiated on February 8, 1990. All

materials were sampled and subsequent proper disposal was

determined as follows:

Concrete was crushed on-site with an hydraulic crushing

arm. All mesh and rebar was separated and removed

using an electromagnet. Thirty-seven loads of crushed

concrete were able to be recycled for road applications

by the Simeone Corporation in Stoughton, Massachusetts.

An additional four loads were landfilled at a nonhazardous Browning-Ferris Industries (BFI) facility in

Fall River, Massachusetts. Two loads were shipped, as

part of the hazardous waste debris listed below, to the

Chemical Waste Management's Model City, New York

Landfill (CWM Facility).

Twelve-hundred cubic yards of scrap metal were sent to

the Prolerized recycling facility in Everett,

Massachusetts.

Two-hundred-forty cubic yards of non-hazardous

demolition debris were disposed of at a BFI facility in

Fall River, Massachusetts and one-hundred-twenty

additional cubic yards were disposed of at the

Ravenbrook Landfill in North Carver, Massachusetts.
Two hundred gallons of dielectric fluid and rinsate

from the electrical transformer were incinerated at

General Electric in Pittsfield, Massachusetts.

• The electric transformer carcass was recycled at Three

C Electrical Testing in Ashland, Massachusetts.

• Two-hundred-forty cubic yards of hazardous waste debris

were disposed of at the CWM Facility.

All rinsate that was generated during the decontamination of the

buildings was pumped into an on-site tanker truck for storage.

It was later treated on-site through the liquid phase carbon unit

which was part of the Low Temperature Thermal Aeration Unit

(LTTA)5 used for treating the VOC contaminated soils.

The Remedial Design Report identified four PCB soil contaminated

areas. Excavation of these areas was initiated on May 9, 1990.

A total of 396.65 tons of PCB contaminated soils were excavated,

transported off-site and incinerated at the Aptus Environmental

Incineration Facility in Coffeyville, Kansas. Post-excavation

confirmatory samples verified that PCB concentrations in the

remaining soils were below the 9 ppm level established in the

ROD. PCB soil excavations were backfilled with a clean-fill

material completing this action on August 24, 1990.

The Remedial Design Report also identified seven discrete VOC

soil contaminated areas, two "Wet Areas" and five "Upland Areas",

which required excavation and treatment. "Upland" area soils

were also found to contain semi-volatile organic compounds

(SVOCs) which required treatment. As prescribed in the ROD, VOC

and SVOC soil remedial design excavation levels and thermal

aeration treatment levels were established for both the "Wet" and

"Upland" areas as part of the remedial design and are listed in

the attached table at the end of this report. The excavation

levels were determined in part from the results obtained during a

Ground Water Modeling Study which was completed in February,

1989.

As shown in the attached table, several VOC compounds found in

the upland area soils have "dashes" for thermal aeration

treatment levels. These VOC compounds had greater volatility

than the others. Therefore, treatment levels for upland area VOC

soils were set using target compounds. The target compounds were

selected on a basis to insure that treatment to their respective

thermal aeration treatment levels would assure proper treatment

of all compounds of greater volatility.

5LTTA is a registered trademark of the Canonie Environmental

Services Corporation.
Between June 11, 1990 and October 10, 1990, a total of 11,330

tons of VOC contaminated soils were excavated and thermally

aerated on-site using the Low Temperature Thermal Aeration Unit

(LTTA). Post-excavation confirmatory sampling verified that VOC

contaminated soil removal to the remedial design excavation

levels was achieved. Post-treatment confirmatory sampling

verified that VOC contaminated soil treatment to the thermal

aeration treatment levels was achieved. The VOC treated soil was

replaced on-site as part of the excavation fill material.

The Management of Migration component of the remedy included the

installation of 6 new overburden monitoring wells and 3 new

bedrock monitoring wells for the long term monitoring of

groundwater quality, as discussed more fully in section IV of

this report.

The final field activity involved Site restoration. This

included approximately 35,000 square feet of wetlands which had

60 cubic yards of clean-fill and 500 cubic yards of topsoil

material added and was regraded and seeded. All fill material

was sampled and found to be free of contamination. The entire

upland area, approximately 99,000 square feet, also was

backfilled with the treated VOC and SVOC soils and was regraded

and seeded. Drainage and erosion controls were implemented as

part of the final Site restoration activities. The Site

restoration activities were essentially complete on December 10,

1990 with the exception of six covered rolloffs of hazardous

materials stored on-site and some additional re-vegetation.

Final remedial action Site activities occurred in July 1991. On

July 19, 1991, the six rolloffs of stored hazardous materials

were removed from the Site and final grading, seeding, and minor

landscaping activities were completed shortly thereafter.

Community Relations Activities;

Throughout the Site's history, community concern and involvement

has been low to moderate. However, one citizen's group,

Bridgewater "AWARE", has maintained interest in activities

occurring at the Site. In 1982, EPA released a community

relations plan which has kept this group and other interested

parties informed through activities such as informational

meetings, fact sheets, press releases and public meetings.

In addition, as part of the groundwater monitoring program,

education programs including public meetings and presentations

will-be undertaken to increase public awareness. Also, copies of

all monitoring data will be supplied to the Town of Bridgewater

as well as adjacent property owners.
8

II. DEMONSTRATION OF QA/QC FROM CLEANUP ACTIVITIES

Prior to the initiation of remedial activities, a Quality

Assurance Project Plan (QAPP) was developed specifically for the

Cannons Engineering Corporation Bridgewater Site in January,

1990. The purpose of the QAPP is to indicate the prime

responsibilities and prescribe the necessary procedures required

to assure that the project is executed in a manner consistent

with the National Oil and Hazardous Substance Contingency Plan

(NCP); the Comprehensive Environmental Response, Compensation,

and Liability Act (CERCLA) and the Superfund Amendments and

Reauthorization Act (SARA); applicable U.S. EPA guidance

documents; and with generally accepted and approved EPA quality

assurance objectives.

During the remedial activities an EPA contractor provided

oversight of field activities including sample collections,

equipment calibrations, and measurements and analyses following

protocols established in the QAPP. Additionally, EPA and their

oversight contractor provided QC suggestions on an informal

(daily) basis and on a formal basis at weekly meetings. An onsite laboratory was utilized for all post-treatment and postexcavation confirmatory VOC samples. The on-site laboratory was

audited twice by EPA QA/QC personnel prior to and during

operations. All other analyses were conducted at off-site

laboratories following established chain of custody protocols.

Data qualification packages were submitted and accepted by the

EPA for all off-site laboratories.

Validation reports verifying the usability of analytical data

were submitted periodically to the EPA throughout the

remediation. All analytical data was found to be useable and all

validation reports were accepted by the EPA.

III. MONITORING RESULTS

Adequate air monitoring and confirmatory sampling programs were

conducted throughout the remedial activities to protect on-site

personnel and the surrounding public from exposure to hazardous

materials and to verify that specified cleanup levels cited in

the ROD were being obtained. The monitoring and sampling program

included:

• Air sampling for Volatile Organic Compounds (VOCs),

Total Suspended Particulates (TSPs) and Polychlorinated Biphenols (PCBs) and air monitoring with

direct reading instruments for VOCs.
Wind direction monitoring and upwind/perimeter ambient

air sampling of VOCs and TSPs to verify background

conditions.

• Work area and personnel air sampling.

• Post-excavation confirmatory PCB soil sampling to

verify removal to concentrations below the 9 ppm action

limit specified in the Work Plan.

• Post-excavation confirmatory VOC and, where necessary,

SVOC soil sampling to verify removal to concentrations

below the Remedial Design Excavation Levels (RDELs)

specified for each VOC in the Work Plan.

• Hourly post-treatment samples were collected from the

Low Temperature Thermal Aeration Unit (LTTA) and

analyzed in an on-site lab to verify VOC soil treatment

to concentrations below the required thermal aeration

treatment levels specified in the Work Plan.

All excavations were conducted in locations where PCB or VOC

removal was necessary to achieve the levels as established in the

ROD and design documents. Overall, a total of 11,330 tons of VOC

and SVOC impacted soils were excavated and thermally aerated onsite and 396.65 tons of PCB impacted soils were excavated and

incinerated off-site. These removal quantities were sufficient

to satisfy the specified clean-up levels as verified by the

confirmatory sampling programs.

Results of the air monitoring program demonstrate that on-site

personnel were not subject to working environments above the

Permissible Exposure Limits (PELs) or the Threshold Limit Values

(TLVs) and that the local public was not adversely affected by

any Site emissions.

Complete documentation of the air monitoring and confirmatory

sampling programs can be found in the Remedial Action Report.

IV. SUMMARY OF LONG-TERM RESPONSE ACTION (LTRA)

AND OPERATIOK AND MAINTENANCE

The Record of Decision includes a management of migration portion

of the selected remedy which involves restricting the use of

groundwater at the Site and implementing a water quality

monitoring program. The purpose of this program is to observe

the distribution, migration and lessening of contaminant levels

on-site over time through natural attenuation. It is estimated

that groundwater cleanup target levels, based on the ingestion of

on-site groundwater including 5 ppb Benzene, 5 ppb
10

Trichloroethylene and 2 ppb Vinyl Chloride, which would allow for

unrestricted water use, will be achieved within 15 to 20 years.

To accomplish this goal, a Long-Term Ground Water Monitoring Plan

has been developed and implemented by the PRP Group. This plan

includes sampling locations, frequency, analytical requirements,

sampling procedures and reporting requirements to be followed by

the PRP Group throughout the operation and maintenance period.

At this time, all wells are in place for performance of the

monitoring plan and the first round of sampling has been

conducted. An appropriate level of quality control and data

validation is incorporated in the plan.

Specifically, the plan calls for sampling by the PRP Group of

groundwater, surface water and sediments for VOCs and SVOCs at

regular intervals. Generally, most VOC sampling will be

conducted quarterly and most SVOC sampling will be conducted

annually for the first 2 years. Thereafter, the sampling

frequency will be re-evaluated by EPA and the MADEP and may be

amended as necessary based on collected data and developing

trends. As a result, the sampling frequency could increase or

decrease. At this time however, annual sampling of VOCs and

SVOCs is anticipated to year 10 and biennial sampling from year

10 to year 20. One monitoring well will be sampled for PCBs

annually for the first 2 years to verify the effectiveness of

that portion of the source control remedy. A complete

description of the groundwater monitoring program can be found in

the Long-Term Ground Water Monitoring Plan for the CEC

Bridgewater Site, August 1991.

A final closeout report will be issued for the Bridgewater Site

upon achievement of all groundwater cleanup target levels and

completion of the long-term ground water monitoring program. The

final closeout report will be a supplement to the interim

closeout report and contain specific information concerning the

ground water monitoring program.

To assure the safety of public health and the environment,

institutional controls, in the form of deed restrictions, are

necessary and have been placed on the two parcels of land that

comprise the Site. The deed restrictions:

1. limit property use to commercial or industrial

applications only,

2. prohibit the use of groundwater over the entire Site,

3. and prohibit excavation on-site to depths below the

groundwater.

Consistent with Massachusetts law, the deed restrictions require

that the Site owners, or their successors, record a subsequent
11

notice of the deed restrictions before the expiration of thirty

(30) years from the date of the original restrictions, and that

they record further notices of the restrictions every twenty (20)

years thereafter. EPA or MADEP will remain in contact with the

Site owners, or their successors, to ensure that they perform the

required subsequent recordings of these deed restrictions.

Since contamination remains at the Site, Section 121(c) of SARA,

requiring five-year reviews, does apply and will be complied with

as described in section V below.

V. SUMMARY OF FIVE-YEAR REVIEW 8TATD8

Consistent with OSWER Directive 9355.7-02, an acceptable and

detailed workplan will be developed for the performance of fiveyear reviews at the CEC Bridgewater Site. The reviews will be of

sufficient detail to determine whether the protectiveness of

human health and the environment is maintained. Activities which

may be conducted as part of the five-year reviews include but are

not limited to:

1. Site documents review,

2. review of protectiveness and applicable or relevant and

appropriate requirements (ARARs),

3. a visual inspection of the Site,

4. and Site interviews with operation and maintenance

contractors and MADEP personnel.

The result of each five-year review will be a report which will

issue a statement of protectiveness or issue recommendations and

implementation requirements to assure the Site remains protective

of public health and the environment based on the current

guidance. The report will also include the scope and nature of

future five-year reviews. Five-year reviews must be performed at

the Site until levels are achieved which would allow for

unrestricted exposure. The first five-year review for the Site

is scheduled for the second quarter of fiscal-year 95.

VI. PROTECTIVENESS

All completion and long-term response action requirements for

this Site have been met as specified in OSWER Directive 9320.2-

3A, as updated by OSWER Directive 9320.2-3B. Specifically,

confirmatory sampling has verified that all ROD soil cleanup

objectives, including removal of PCB concentrations to below 9

ppm and removal of VOC and SVOC concentrations below the remedial
12

design excavation levels, have been achieved and all cleanup

actions specified in the ROD have been implemented. Results of

air monitoring, confirmatory sampling and the backfilling of the

Site with a clean-fill material provide further assurance that

the Site is protective of human health and the environment.

The necessary deed restrictions are in place and the only ongoing

activity at the Site is the long-term monitoring of groundwater

being conducted by the PRP Group with EPA and MADEP oversight to

assure that groundwater cleanup target levels are achieved.

A bibliography of all reports relevant to the completion of this

Site under the Superfund program is attached. These documents

are available for review by calling the Region 1 office at (617)

573-5729.

Approved By:

Regional Administrator Date
Compound

VOCs

SOIL REMEDIATION CRITERIA

FOR VOCS and SVOC3

Upland Area Soils

Remedial Design

Excavation Level

(ppm)

Trichloroethene

1.1 dichloroethene

Toluene

Xylene

Chlorobenzene

Tetrachloroethene

Benzene

Ethylbenzene

1.2 dichlorobenzene

1.3 dichlorobenzene

1.4 dichlorobenzene

1,1,1 trichloroethane

0.5

0.5

1.0

1.0

1.0

0.5

1.

1.

1.

1.

1.0

Thermal Aeration

Treatment Level

(ppm)

0,

0,

0,

0,

1

1

2

2

0.1

0.1

0.5

8 VOCs

4-methyIphenol

2-methyInapthalene

Dimethylphthalate

Di-n-butylphthalate

Phenol

N-nitrosodiphenylamine

Bis(2-ethyIhexyl)phthalate

Naphthalene

Butylbenzylphthalate

3

3

3

3

3

3

3,

3

3,

1,1 dichloroethene

Trichloroethene

Benzene

Vinyl chloride

Tetrachloroethene

Wet Area Soils

0.16

0.12

0.12

0.05

0.12

3

3

3

3

3

3

3

0

0

0

0

0

0

0

3.0

3.0

0.1

0.1

0.1

0.05

0.1

Remedial Design Excavation Levels - concentrations above

which soils required excavation.

Thermal Aeration Treatment Levels - concentrations to which

excavated soils required treatment.

The "dash" (-) indicates compounds with greater volatility.
REFERENCES

Ebasco Services Inc., "Remedial Investigation - Cannons

Engineering Site", May, 1987.

Ebasco Services Inc., "Endangerment Assessment - Cannons

Engineering Site", May, 1987.

Ebasco Services Inc., "Wetlands Assessment - Cannons

Engineering Site", April, 1987.

Ebasco Services Inc., "Feasibility Study - Cannons

Engineering Site", January, 1988.

United States Environmental Protection Agency, 1988, "Record

of Decision - Cannons Engineering Site", March 31, 1988.

Canonie Environmental Services Corp., "Health and Safety

Plan, Quality Assurance Project Plan for Remedial Action at

the Cannons Engineering Site", January, 1990.

Canonie Environmental Services Corp., "Remedial Design

Report - Cannons Engineering Site", January, 1990.

Canonie Environmental Services Corp., "Remedial Action Work

Plan - Cannons Engineering Site", January, 1990.

Canonie Environmental Services Corp., "Draft Remedial Action

Report - Cannons Engineering Site", August, 1991.

Canonie Environmental Services Corp., "Long-Term Ground

Water Monitoring Plan - Cannons Bridgewater Superfund Site",

August, 1991.

United States Environmental Protection Agency, "Procedures

for Completion and Deletion of National Priorities List

Sites - OSWER Directive 9320.2-3A", April 1989.

United States Environmental Protection Agency, "Update to

the Procedures for Completion and Deletion of National

Priorities List Sites - OSWER Directive 9320.2-3B", December

29, 1990.

Partial Consent Decree,•entered by the Court in the United

States v. Cannon's Engineering Corporation, et. al». 720 F.

Supp. 1027 (D. Mass. 1989), aff'd. 899 F.2d 79 (1st Cir.

1990).