The URL can be used to link to this page

Home My WebLink AboutNCD980602163_19830701_Warren County PCB Landfill_SERB C_Final Report for PCB Waste Disposal-OCRfi \ NORTH CAROLINA DEPARTMENT OF CRIME CONTROL AND PUBLIC SAFETY FINAL REPORT PCB WASTE DISPOSAL SITE WARREN COUNTY, NC ITEM 1111-1990 CODE 14900 JULY, 1983 Prepared by Sverdrup & Parcel 2211 W. Meadowview Road Suite 114 Greensboro, NC 27407 GENERAL DESCRIPTION FINAL REPORT PCB WASTE DISPOSAL SITE WARREN COUNTY The PCB Waste Disposal Site is a hazardous waste landfill containing approximately 40,000 cubic yards of polychlorinated biphenyl (PCB) contaminated soil located in Warren County, North Carolina. PERTINENT DATA Contractor's bids for the construction of the site were opened on January 21, 1982, and the contract was awarded May 28, 1982 to Jim Lineberger's Grading & Paving Inc. of Gastonia, NC. Construction work began on June 21, 1982. Continuous heavy rains and vandalism of the groundwater monitoring wells and the 3O-mil PVC liner curtailed job progress throughout the month of August, and construction was not completed to the stage necessary for PCB placement until September 14, 1982. NC DOT trucks began hauling PCB contaminated soil on September 15, 1982 and completed hauling on October 12, 1982, except for twelve loads of additional contaminated material which were delivered to the landfill by NC DOT on November 17, 1982. A private firm, Propst Construction Company of Concord, NC, under contract with the Department of the Army, began hauling PCB contaminated soil from Fort Bragg on October 6, 1982, and finished on October 27, 1982. Construction work was completed on July 14, 1983. The final inspection of the completed project was conducted on July 15, 1983 and final acceptance was on that date. -1- ( CONSTRUCTION SEQUENCE AND DESCRIPTION Initially four groundwater monitoring wells were installed, located north, south, east, and west of the landfill. As designed and installed, these wells were determined to be unsatisfactory by the NC Department of Natural Resources and Community Development. Four replacement wells were installed immediately adjacent to the original wells. These wells were vandalized during construction and were repaired or redrilled. The wells utilized 4" PVC pipe and screens with lockable steel caps. An earthen containment structure 476' long and 232' wide was built by excavating to bottom elevations sloping from elevation 320' to 314' and filling to a berm elevation of 342'. Side slopes are 3:1 on the north, west, and east sides, 5:1 on the south. Topsoil, clay, and silt materials excavated were stockpiled separately for later use. A 9" layer of permeable sand was placed on this subgrade as a lower leachate collection system, draining to a collection sump and 611 PVC extraction pipe in the northeast corner of the landfill. A 30-mil PVC liner, manufactured by Staff Industries of Detroit, Michigan, was installed over this sand layer. This liner was slashed in 23 places by vandals and was repaired by patching with additional liner material. A one foot thick layer ot compacted bridging fill was placed over the 30-mil PVC liner, using previously stockpiled clay and silt materials. A five foot thick compacted clay liner was constructed over the bridging till using select clay material previously stockpiled, or obtained from clay borrow areas on the site. Extensive heavy rains during this critical stage of construction delayed progress for approximately one month. -2- An upper leachate collection system was placed above the clay liner, using a 9" layer of permeable sand, draining to a collection sump and 6" PVC extraction pipe in the northeast corner of the landfill. As final preparation for the placement of PCB material, a carbon filter system was installed. This system consisted of a sand filter, carbon filter, and temporary holding pond, located just northeast of the landfill. The intent of the system was to treat excess rain water collected in the disposal area during PCB placement, but the system was not used during construction because a N.R.C.D. Discharge Permit had not been obtained prior to construction. The system was left in place to facilitate the State in removing water accumulated in the upper leachate collection system during construction, and an irrigation system was designed and installed during the later phase of the project to spray the filtered water back on top of the landfill. Supac filter fabric material, manufactured by the Phillips Petroleum Company, was placed over the upper leachate collection sand layer to prevent migration of the contaminated soil into the sand layer. The PCB contaminated soil was then hauled and dumped by trucks from NC DOT and by trucks from Propst Construction Company on contract with the Department of Defense. The contaminated soil was placed and compacted by the construction contractor to a final top elevation shown on the plans. The actual volume of PCB material placed was approximately 40,000 cubic yards. A one foot thick layer of compacted bridging fill was placed over the PCB soil, again utilizing previously stockpiled clay /silt materials. -3- I \ A two foot thick compacted clay liner was constructed over the bridging fill using select clay material obtained from a second clay borrow area on the site. A 10-mil PVC liner, also manufactured by Staff Industries of Detroit, Michigan, was installed over this clay liner and sealed to the lower liner. Another one foot thick layer of compacted bridging fill was placed over the 10-mil PVC liner. A 4" PVC pipe gas vent was installed, located at the center point of the landfill. The entire top surface of the landfill and the 5:1 outslopes were then covered with a one foot thick layer of topsoil, utilizing material previously removed and stockpiled. This area and all adjacent disturbed areas were limed, fertilized, seeded, and mulched. A steel chain-link fence, with steel posts was installed around the perimeter of the disposal area. -4- EXHIBIT "A" -AREA FIGURES The PCB Waste Disposal Site is located on a 142.3 acre tract, off SR 1604 near Afton community in Warren County. Within this tract, a 19. 32 acre area contains the landfill and will be retained in state ownership. The remainder has been deeded to Warren County as a buffer zone surrounding the landfill. The inside dimensions of the earthen containment structure are 476'x 232', or 2.54 acres. The area within the chain-link fence is 300' x 550', or 3.79 acres. -5- CONTRACT General EXHIBIT "B" -COST DATA ORIGINAL COST $362,619.00 CONSTRUCTION COST CHANGE ORDER ADDITIONS $58,828.09 COST $421,447.09 CONSTRUCTION COST SUB-TOTAL $ 421,447.09 ...;.._-----'---- DESIGN & CONSTRUCTION INSPECTION FEES Sverdrup & Parcel $ 78,118.51 Soil & Material Engineers $ 14,810.11 DESIGN & CONSTRUCTION INSPECTION FEES, SUB-TOTAL $ 92,928.62 TOTAL PROJECT COST $ 514,375.71 --'--------'---- -6- GENERAL CONTRACT c.c.o. NO 1 2 3 4 5 6 7 8 9 10 EXHIBIT "C" -CHANGE ORDERS DESCRIPTION New Monitoring Wells Time Extension Time Extension Security Guards Security Guards Security Guards Security Guards Additional Fencing Spray Irrigation System Temporary Seeding & Additional Erosion Control TOTAL -7- AMOUNT $ 6,987.50 -0- -0- 4,214.00 3,923.75 11,558.40 5,493.25 3,323.32 7,456.00 15,871.87 $58,828.09 • ( EXHIBIT "D"" -CONTRACTORS, SUBCONTRACTORS, & MATERIAL SUPPLIERS GENERAL CONTRACT Prime Contractor -Jim Lineberger's Grading & Paving, Inc. Route 2 -Box 77A Gastonia, North Carolina 28052 SUBCONTRACT CONTRACTOR Groundwater Monitoring Wells Ezra Mier Associates, Inc. 401 Glenwood Avenue Surveyors PVC Liners Seeding Chain-Link Fence P. 0. Box 12447 Raleigh, NC 27605 Southern Survey, Inc. 1006 Lamond Avenue Durham, NC 27701 Arkay Corporation 1321 Romany Road Charlotte, NC 28204 Lineberry, Inc. Climax, NC U.S. Steel, Cyclone Fence Charlotte, NC -8-