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AW•cro Fr"U11 f]ICUVA-1 & L.MLLWCLL i" MLL 71L 'JSr LJIZb I�J AUXLEINFELDER File INo. '1D-3725-01 Scpti tuber 21, 1993 Mr. Us Snaith Kause Construction 411 Main Street, Suite E Suisun, CA 94585 SrtbjleccMATERIALS TESTING SERVICES KENT'S OIL SERVICE STOCKTON, CALIFORNIA Dear Mr. Smith: Thin letter is to confirm our recent discussion regarding materials testing services at the Kent's Gil Service facility oil MiMr Street in Stockton, California. As you are aware, we havz previously been under contract with Frown arts Caldwell to provide geotechnical services for this pmject. In our letters dated July 13, and August 25, 1993 recommendations were �-' provided to Brown and Caldwell regarding the backfill of the excavation at the Kcnt Oil facility_ i Even thougi bI to cxcavation has extended to alit depth of approximately 45 feet, we understand that some eorttamination still remains in the bottom of the excavation. Apparently. Sari Joaquin County Environmental Health has requested that several feet of clay material be placed at the bottom of tht; excavation to act somewhat like a liner. We have concerns regarding the operation of equipment and the placement of men in the base of the excavation. For <afecv reasons we suggest that a plastic liner be considered is lieu of clay mattrial. Since the lc'6,cl of cbntarnination apparently is relatively low- we suggest khat multi layers or 6 or 10 mil visWtr) with proper overlapping and caulked seams be considered. We understand allot once the plastic finer is in placer that approximately 20 feet of free-draining gravel will be placed in the excavation. Prior to the placement of fill on the gravel, we recdrwnead that a large vibrating steel dram compactor be used to tfensify the gravel, We have assumed that the remainder of the backfill will be placed at approximate 1 foot lifts and that our technician would be scheduled to visit the site every 2 feet of bacl�ill- This would allow our technician to excavate 12 imhes below subgrade and evaluate the lower lift. For estirrrating purposes we have assumed approximately 13 trips to the site would be necessary since the depth of backfill will be approximately 25 feet. We have also assumed that two labora>:ory compaction curves would be needed as well as some supervision and a final report. C4pYrtght 7993 RErinfvtdar, Inc_ Page i of 2 KLErn+rELEItR 2825 f4it 5torkron. Ci 93203 :2094 946-1345