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*MEMORANDUM <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD o CENTRAL VALLEY REGION <br /> 3443 Routier Road Phone: (916) 361-5600 <br /> Sacramento, CA 95827-3098 ATSS: 8-495-5600 <br /> TO: Wendy L. Cohen FROM: Michael Higgins <br /> Sr. WRC Engineer WRC Engineer <br /> DATE: 5 December 1988 SIGNATURE: <br /> SUBJECT: SOLID WASTE ASSESSMENT TEST REPORT REVIEW, LANDFILL PIT 6, <br /> LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300, SAN JOAQUIN <br /> COUNTY - CASE #2677 <br /> I have reviewed the 1 July 1988 report entitled "Solid Waste Assessment <br /> Test (SWAT) , Inactive Landfill Pit 6, Lawrence Livermore National <br /> Laboratory Site 300" . Following is a brief summary of the SWAT contents <br /> and findings and my specific comments on SWAT deficiencies. <br /> Summary <br /> In accordance with Article 4 , Section 13273 (b) (1) of the Water Code, <br /> the report adequately analyzes the surface and ground water on, under, <br /> and within one mile of Pit 6. To enable the ready detection of wastes <br /> possibly escaping from the landfill, LLNL has completed 15 monitoring <br /> wells (MWs) surrounding Pit 6 . The SWAT report comprehensively <br /> discusses the geology and hydrology found within a one mile radius of <br /> Pit 6. For each MW, the report provides a well log illustrating the <br /> stratigraphy and well construction. LLNL correctly constructed the 1jis, <br /> including a concrete cap at ground level and a grout seal at the <br /> borehole bottoms. In the annular space, bentonite pellets isolate the <br /> upper layer of cement grout from the Monterey sand filter pack placed <br /> adjacent to the screened interval. <br /> LLNL currently samples the IN111s under bona an ongoing ground water <br /> monitoring program and a remedial investigation program, and sarlp.les <br /> are analyzed for a suite of constituents including total organic carbon <br /> (TOC) , total organic halogens (TOX) , volatile organic compounds (VOCs) , <br /> and Title 22 metals and organics. The remedial investigation began in <br /> June 1987 and focuses on trichloroethylene and other halogenated <br /> organics found in nearby shallow ground water. Based on Pel sampling and <br /> analysis, the SWAT report concludes that evidence strongly suggests that <br /> landfill Pit 6 is leaking TCE. LLNL has ,_omnzitted to prepare a <br /> feasibility study of cleanup options for Pit 6 by September 1989 . <br />