NCD980602163_19810414_Warren County PCB Landfill_SERB C_Review of Plans and Specifications, Proposed Disposal Site-OCR

. . ' .
MEMORANDUM
TO:
FROM:
Bill Meyer
Charles Gardner
April 14, 1981 ·
SUBJECT: Review of Plans and Specifications -Warren Co. Proposed
PCB Disposal Site
As requested, we have reviewed the plans and specifications prepared
by Sverdrup and Parcel for the proposed PCB waste disposal site in
Warren County. The plans are dated 1/30/81 and were received by us from
your office on 3/3/81.
I have some concern that a seasonally high ground water table could
be at or above the proposed pit bottom. According to the data presented
on the plans, the measured groundwater leve ls are roughly 10 feet below
the proposed pit bottom; the date of the ground water readings is not
noted. The normal range in seasonal variation for upland Piedmont
ground water levels is 5 to 10 feet, and variations as much as 25 feet
have been observed. I understand that there is an observation well over
one mile away that shows historical variations of only a very few feet;
in the Piedmont, projection from that distance is questionable. In the
absence of long term site specific ground water data, you may want to
consider installing a covered drain trench and collection/monitoring
point extending from the northwest corner of the pit bottom to about the
308-310 foot ground surface contour as a safety measure. According to
the site topography shown on the plans, this trench would be about 400
feet long. Alternatively, a short "deacl.-end" trench could be extended
about 50 feet out from the northwest corner of the pit and could be
exten~ed later if monitoring wells indicate a ground water level problem
is developing.
I am attaching some hand written comments from Bill Weldon, our Chief
Engineer at the time of this review. These connnents apply mostly to
erosion and sediment control considerations. It is emphasized that
additional details on erosion and sediment control will be needed prior
to construction. The more detailed plans should be forwarded to John Holley,
Land Quality Regional Engineer, at least 30 days prior to beginning
construction. Mr. Holley would be glad to meet with you or your engineers
to discuss the details, at your request.
Thank you for the opportunity to review this information.
CHG:gf
cc: Steve Conrad
Harlan Britt
John Holley
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