NCD980602163_19970612_Warren County PCB Landfill_SERB C_Documents from Bill Meyer to Dr. Gregory Richardson-OCR

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Waste Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
William L. Meyer, Director
Dr. Gregory N. Richardson, Ph.D., P.E.
G. N. Richardson & Associates, Inc.
417 N. Boylan A venue
Raleigh, NC 27603
Dear Dr. Richardson:
AVA
DEHNR
June 12, 1997
Attached are several documents pertaining to the PCB landfill in Warren County. The Division
of Waste Management would appreciate your reviewing the data and providing us any thoughts,
conclusions, recommendations or interpretations that you may have, as a result of the review.
The state, in conjunction with the Warren County PCB Working Group, performed an evaluation
of the landfill this past February. Activities on and in the landfill included boring two holes to obtain
soils for bench scale detoxification demonstrations, which are currently on going. Samples were obtained
in split spoons and analyzed for moisture content and several relatively undisturbed Shelby tubes were
pushed for geotechnical testing of the soils of the landfill cap and the contents. The results have been
provided. Samples of the PVC cap liner were obtained and also evaluated for their physical
characteristics. As a reference, the original material specifications for the PVC liner, and results of CQA
testing on the landfill liner and clay barrier have also been included.
Additionally, a memorandum to the working group's Technical Committee from their science
advisors has been included. We would be particularly interested in your opinion of the fluctuating water
levels that are measured in the landfill leachate collection system and a piezometer installed in the
landfill air vent.
Thank you in advance for taking time from your busy schedule to review this information. If
there are any questions please do not hesitate to contact me or Mike Kelly (ext. 203), the division deputy
director, and Ed Mussier (ext. 343), engineer with the Solid Waste Section. Both are familiar with the
landfill exploration and testing program. They should be able to provide you any other information you
may need. We may be reached at 733-4996.
BM/efm
cc: Mike Kelly
Ed Mussier
Pat Williamson
Patrick Barnes
Joel Hirschorn
Sincerely,
~!.~::!.
Director
Warren County Working Group
P.O. Box 27687,
Raleigh, North Carolina 27611-7687
Voice 919-733-4996
~,~,.~1'1 l ~ '1 Ah Equal Opportunity Affirmative Action Employer
FAX [phone]
f#ffi@IM#Mi 50% recycled/ l O"/o post-consumer paper
State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Solid Waste Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
William L. Meyer, Director
MEMORANDUM
TO: Bill Meyer, Director, Division of Solid Waste Management
FROM: Ed Mussler,E.I.T., Solid Waste Section, Division of Solid Waste Managemen~
Greg Eades,E.I.T., Solid Waste Section, Division of Solid Waste Management 714...
RE: Volume of Soil Estimated in the PCB Landfill
The approximate volume of soil in the PCB landfill has been calculated. There is
approximately 36,500 cubic yards of material in the landfill. Assuming an average weight of
1.5 tons per cubic yard, there are approximately 54,750 tons of material in the landfill.
The volume and weight of the wet and dry soil that may be available was determined. The
amount of wet and dry soils in the landfill are conservatively estimated as:
Volume of Dry Soil-21,500 cubic yards
Volume of Wet Soil-15,000 cubic yards
METHODOLOGY
The average-end-area method of calculating the volume was employed. This method tends to
over estimate the actual volume, so it should represent a maximum amount of soil in the
landfill. The supplied drawings were consulted. It was assumed that the final contours were as
depicted and that the grading plan was the subgrade. Five feet were subtracted from the top
elevations to account for the closure cap system, and 7 feet were added to the grading plan
elevations to account for the leak detection layer, clay barrier layer and leachate collection·
system. Seven cross sections were chosen and the geometry plotted. Given the simple nature
of this design we were able to determine the area of right triangles. These areas were summed
and multiplied by two to account for the entire cross section of the landfill. The volume of soil
was estimated using the following formula:
V = L (Al+ A2)/ 2 (27ft3 per yd3)
The weight of the soil was conservatively estimated by assuming that the soil has a unit weight
of 1.5 tons per cubic yard.The cross sections and calculations are attached.
Water level measurements in the landfill are available from two measurement points, the
leachate sump pipe and the gas vent well. The water level readings from the two points were
obtained and translated into an elevation. The two measurements are within six inches of each
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post-consumer paper
other. The top nineteen feet (at the maximum point of the landfill) is dry, and the maximum
depth of saturated soil is ten feet.
The approximate volume and weight of soil which may be recovered from four cased wells,
each two feet in diameter was also determined. The wells were assumed to be evenly spaced
across the flat bottom portion of the landfill (i.e. no wells were located over sideslope
portions). Each well could yield:
Volume of soil in two foot diameter well,-91.11 cubic feet
Dry Weight of soil per well-89.48 pounds per cubic foot
Total Dry Weight of Soil from four wells -4 tons per well
The soil was assumed to have a dry denisty of 111 pounds per cubic foot. The weight of
saturated soil was adjusted to its dry weight equivalent. The adjusted density per well is 89 .48
pounds per cubic foot.
LIMITATIONS
The information and numbers generated herein are based upon commonly accepted engineering
methods. All of the drawings and measurements have been supplied by others and the resulting
information is as correct as the data supplied to us. The actual conditions and amount of
saturated and unsaturated soil within the landfill may vary, dependent upon the variance of the
actual conditions in the landfill . A reasonable dry weight and density of the soil was assumed
for computational purposes; the actual soil is highly variable.
If there are any questions, please do not hesitate to call on us.
Environmental Engineer
Solid Waste Section
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