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s Corporate Office's 41674 Christy Street,Fremont,CA 94538.31 f4 (415)659.0404 Fax:(415)651-4677 Conir.Lic.No.464324 ensco Mof volronmental services, inn. May 26, `1988 City of Stockton "EALTH Public Works Department ERiti41T/�lw1�" City Hall, Room 317 Stockton, CA. 95202 j Attn: Mr. Jim Escobar Re: Soil Sampling City of Stockton's Smith Canal Pumping Plant Stockton, California EES Project No. 2423D Dear Mr. Escobar: This letter report presents laboratory test resu'is on soil samples collected from one exploratory boring drilled at the above site on May 4, 1988, (Figure 1). Introduction Per your authorization, Ensco Environmental Services (EES) conducted an exploratory soil boring adjacent to the location of a previously removed leaking underground fuel storage tank. At the time of this soil boring, soli samples were collected in native material beneath the former underground tank. Soil sample 2 was obtained from a stiff, silty clay at a depth of 17 to 17 112 feet below the existing surface elevation, Field Investigation .EES conducted"the soli sampling.on;May 4,"A986. The boring was drilled with a trailer-mounted D- 25 drill rig using 6-inch O.D. x 3 114-Inch LD. continuous flight hollow stem augers. Relatively undisturbed soil samples were collected at five foot depth intervals and/or a change in subsurface ' conditions with a 140 pound rig-operated hammer driving a modified California split spoon sampler 18-inches into the soil. All soil samples collected for laboratory analysis were, upon retrieval from the sampler, capped with aluminum foil and a plastic cap at both ends, and placed in a cooled ice chest i for shipment to a state-certified laboratory. The boring, designated B-1, was drilled to a total depth of 17 112 feet. No ground water was encountered within this depth interval.-During the drilling and sampling operation a diesel odor was - __.. ..._. noted In the soil beneath the gravel backfill at the sampling depth. After Vie sampling was completed, the borehole was backfilled with a 5% bentonite/portland cement mix. The soil samples were logged by an EES driller at the site. The boring log is attached.