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STATE OF CALIFORNIA-Environmental ProtectionAgency • PETE WILSON Governor <br /> CALIFORNIA REGIUrNAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION a <br /> 3443 Routier Road,Suite A _ <br /> Sacramento,CA 95827-3098 <br /> PHONE:(916)255-3000 - --- <br /> FAX:(916)255-3015 <br /> 5 June 1996 <br /> Mr. Gregory Basso <br /> Independent Trucking <br /> P.O. Box 6698 <br /> Stockton, CA 95206 <br /> SOIL INVESTIGATION NEAR THE FORMER ABOVEGROUND DIESEL STORAGE <br /> TANKS, INDEPENDENT TRUCKING FACILITY, STOCKTON, SAN JOAQUIN COUNTY <br /> I have reviewed the 19 October 1995 Soil Assessment Report prepared by Kleinfelder for the <br /> Independent Trucking facility in Stockton. The report presents the results of soil sampling adjacent <br /> to two former aboveground diesel storage tanks at the site. Six borings were drilled to approximately <br /> 25 feet below the ground surface with soil samples taken at approximately five foot interval. Surface <br /> samples also were collected at the same six locations. <br /> The analytical results show up to 3,400 mg/kg of total petroleum hydrocarbons as diesel at the surface <br /> and up to 3,900 mg/kg at 10 feet below the ground surface. In at least one boring (AB-2) contamination <br /> was noticed visually in the coarser sediments encountered up to 20 feet deep although the analytical <br /> results showed no detectable concentrations. The channeling of liquid spills through preferential <br /> pathways in the subsurface makes borings prone to the "hit and miss" phenomena. <br /> Kleinfelder has recommended excavating contaminated soils with confirmation sampling. I agree with <br /> these recommendations although the excavation area should encompass the area around borings AB-2, <br /> AB-4 and VB-1, and AB-3. By 28 June 1996; please submit a work plan to conduct the remedial work <br /> and include a schedule with particular calendar dates. <br /> If you have any questions, you may call me at (916) 255-3077. <br /> � �L= <br /> JOEL M. WEISS <br /> Engineering Geologist <br /> JMW:jmw/Isb <br /> cc: Ms. Linda Turkette, San Joaquin County Public Health Services, Stockton <br /> Ms. Carrie Fisher, Independent Trucking, Stockton <br />