HomeMy WebLinkAboutDEQE - 11/9/1988Gilbert T. Joly
Regional Director
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November 9, 1988 >
Hathaway & Patterson RE: MANSFIELD--OIR/SA-4-571
P.O. Box 177 Release of Hazardous Material,
Mansfield, Massachusetts 02048 15_.,County Street, Mansfield, MA
Approval,_. Phase II Scope of Work'_)
M. G. L. Chapter 21E
ATTENTION: William E. Haynes, President
Gentlemen:
The Department of Environmental Quality Engineering, Division of
Hazardous Waste, has reviewed an October 1988, Phase II site assessment
scope of work on the above -referenced site titled "Hathaway and Patterson
Phase II Site Investigation," prepared on your behalf by Keystone
Environmental Resources, Inc. The Department approves this scope of work
with the following provisions:
1. All work as outlined in the scope of work, the site assessment
report, the risk assessment, and the evaluation of remediation
alternatives (page 3-8) will be completed and submitted to the
Department within seventy-five (75) days or your receipt of this
letter;
2. Cross section(s) showing the overburden thickness and lithologies
(based upon detailed sample descriptions) including -layering, the
bedrock, and the horizontal and vertical (if any) components of
ground water flow shall be included with the site investigation
report;
3. Plume maps shall be drawn with the relative contaminant
concentrations, based upon the sampling results, contoured; and
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4. While MW-10 should show whether or not contaminants are entering
the wetland and Rumford river backwash areas to the south of the
site, this southernmost monitoring well location is about 560 feet
southwest of MW-6, which had high levels of xylenes and PAH's, and
ma not provide enough data to delineate the plume south of MW-6
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and the bedrock outcrop. Therefore, you shall install an
additional monitoring well between MW-7 and MW-9 or submit
supporting information to justify the exclusion.
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This site is now subject to the Massachusetts Contingency Plan (MCP)
310 CMR 40.000 which took effect on October 3, 1988. The MCP defines the
purpose, scope, and requisite activities in successive phases of
investigation and remedial action. All further work at this site,
including the Phase II Comprehensive Site Assessment (310 CMR 40.545(3))
being done according to this scope of work and the Phase III Development
of Remedial Response Alternatives and Final Remedial Response Plan (310
CMR 40.546) will have to be completed according to the guidelines set in
the MCP and the Draft Interim Guidance Document for doing risk
assessments, both available at the State House Bookstore in Boston.
Please keep the Department informed as to the dates and times for all
work scheduled and in progress, so that site visits can be arranged as
needed. If you should have any questions regarding this matter, please
contact Patricia Billingsley of this Department. In any correspondence to
this office, please refer to DEQE case number 4-571.
Very truly yours,
Christopher Tilden, P.E., Chief
Hazardous Waste Section
T/PB/cb
CERTIFIED MAIL # P 676 087 942
RETURN RECEIPT REQUESTED
cc: DEQE BOSTON - OIR
Board of Health
Town Hall
Mansfield, MA 02048
Conservation Commission
Town of Mansfield
50 West Street
Mansfield, 14A 02043
Ronald J. O'Toole
Project Manager
Keystone Environmental Resources, Inc.
440 College Park Drive
Monroeville, PA 15146
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