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93 ;J1 � 13'�,2^� K1EI K:-, u�P rrtl k�1. � 99��tiGC1 P, 02/1 <br /> CLF-�I-�� : <br /> C <br /> b <br /> a <br /> �- <br /> KLEIN FELDER <br /> File No. 20-3725-01 <br /> September 21, 199: <br /> ;lr. Les Smith <br /> Kause Construction <br /> 411 Main Strcct, Suite E <br /> 16, SuisiiD, CA 94585 <br /> Sabje-ct: MATERIALS TESTMG SERVICES <br /> KENT'S OIL SERVICE <br /> STOCKTON, CALIFORNIA <br /> .� Dear Mr. Smit}i: <br /> This letter is to confirm our recent discussion reg2xding materials testing services at the K.-at's <br /> r� Oil Service facility on Miticr Street in Slocktort, Cahfomia. As you ate aware, we have <br /> previously been under contract with Brown and Caldwell to provide geotechnical st rvices for <br /> utas pro*t. In our letters dated July 13, and August 25, 1993 recotnlneLdhtioru were <br /> provided to Browu and Caldwell regarding the backfill of the excavation at the Kent Oil <br /> facility. <br /> Fven tl)ougb the excavation has extended to the d-.Vih of approximately 45 feet, we understand . <br /> that some contamination still remains in the bottom of the excavation, Apparently, San Joaquin <br /> County Environmewal Health has requested that several feet of clay material be Pla",ed at the <br /> bottom of the excavatioi; to act sz)niewhat like a liner. 'We bave concerns regarding the <br /> operation of equipment and the placement of men in the base of the excavation. For safety <br /> reasons we suggest that a plastie liner be comidcred jn lie i of clay material. Since the levcl <br /> Of eontarr:inatiln apparently is relatively low, :ve suggest that multi layers of 6 or 10 mil <br /> vIsqucon. with pioper overlapping and caulked scants be considered. <br /> We understand tk at once the plastic liner is in place, that approximately 20 feet of free-drainin <br /> gravel, will be placed in the excavation. Prior to tine placement of fill on the gravel, we <br /> ,ecommend that a large vibrating steel druni compactor be used to densify the gravel. We <br /> kvic assumed that the remainder of the backfill will be placed at approximate 1 foot lifts and <br /> that our tecbniciaa would be scheduled to visit the site every 2 feet of backfill. This would <br /> ,.. allow our technician to excavate 12 inches below subgrade and tvaluatc Ol c lower lift. For <br /> estimating purposes we have assumes{ approximately 0 trip. Eo the site would be necessary <br /> since be depths of backfill will be. approximately 25 feet. We have also assumed that t�vo <br /> laboratory compaction curves would be needed as well as some supervision and a fuial report. <br /> .r <br /> Copyright 1993 K`,einftLder, Inc. Page 1 of 2 <br /> 6,.., KLEN—Fr'kDER 2823 Eas; Myriie Sumer. Stockton. CA 95205 (209) 946.13-45 <br />