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9&ta cAssociates <br /> Consultants in Waste Management,Environmental Control and the Geotechnical Sciences <br /> August 8, 1983 <br /> Project 116-1.4 <br /> t <br /> California Regional Water Quality Control Board <br /> Central Valley Region AUG 111983 <br /> 3201 "S" Street <br /> Sacramento, California 95816 SAN JOAQUIN E.( CAL <br /> HEALTH DISTRICT <br /> Attention: Mr. Thomas R. Pinkos, Toxics Unit <br /> Subject: AMENDED CONSTRUCTION PROPOSAL: Disposal Trench No. 4 <br /> Forward Class II-1 Disposal Site <br /> San Joaquin County, California <br /> Based upon comments made at our technical meeting and the contents of <br /> your memorandum dated 22, July 1983, we are submitting amended <br /> construction proposals for the subject disposal facility to handle FMC <br /> barium/strontium sludge wastes. <br /> A. General Design <br /> We have revised our drawings showing the general trench design and trench <br /> details. These amended drawings are attached as plates 1, 2 and 3 to <br /> this proposal; hopefully the plates will have the dimensions and details <br /> requested. <br /> Revised estimates of capacity requirements have resulted in our amending <br /> the size of the facility to be developed. Construction and filling of <br /> the trench will commence in a step wise manner beginning with the low end <br /> (north end of trench ##4). Phase 1 in this step filling sequence will <br /> involve approximately the north one-half or 350 feet of the disposal <br /> trench. The north one-half of the disposal trench will contain the side <br /> wall liners on the east, north and west sides of the trench and a <br /> compacted engineered embankment 12 feet high traversing the trench along <br /> the southern margin of the operation area. This entire area will be <br /> underlain by a compacted clay liner with a minimum thickness of 2 feet. <br /> Three views of the completed portion of the disposal trench is contained <br /> on Plate 1 and details appear on Plates 2 and 3. The detailed drawings <br /> outline dimensions of operations area, liners, slopes and details <br /> pertaining to the leachate collection system. When completed this area <br /> will have a total capacity of 38,000 cubic yards. This capacity will <br /> accomodate the waste material currently in storage at both FDIC and at <br /> Forward Inc. and will also handle the estimated volume of waste to be <br /> generated between now and the time the FMC plant is closed. <br /> i <br /> 1365 Vander Way 9 San Jose, California 95112 • (408) 295-7483 <br />