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law � <br /> kn KLEINFELDER <br /> January 5, 1988 1 <br /> File: 24-2079-01 ®� <br /> Mr. Keith Tallia <br /> Oil Equipment Services <br /> P.O. Box 950 <br /> 4\71 <br /> San I� <br /> San Andreas, CA 95249 <br /> SUBJECT: Soil Sample Analytical Results, Di Salvo Truck Lines <br /> Dear Mr. Tallia: <br /> Enclosed are the analytical results for the soil sample collected from Di <br /> Salvo Truck Lines at 100 Ventura Street, Stockton, California. It is <br /> Kleinfelder's understanding that one underground diesel tank was excavated <br /> and removed from the site. After consulting with Mr. Dan Moe of the San <br /> Joaquin County Local Health District, John Armstrong of Oil Equipment <br /> Services requested one soil sample be collected from the bottom of the <br /> open excavation below the filling end of the tank. <br /> On December 11, 1987, a Kleinfelder geologist collected one soil sample at <br /> a depth of approximately 21 feet from the native soil within the <br /> excavation (see Plate 1) . Soil sample SS-18308 was a gray, very moist, <br /> silty clay. Qualitative field screening using a field photoionization <br /> detector (PID) at the 15 foot-depth resulted in readings of over 1,700 <br /> parts per million by volume (ppmv) . With these results, Mr. Moe advised <br /> advancing the depth of the excavation. Due to equipment limitations, the <br /> maximum obtainable depth was 21 feet, at which depth Sample SS-18308 was <br /> collected. At both the 15 and 21 foot depths, a hydrocarbon odor was <br /> observed. It is Kleinfelder's understanding that following the <br /> acquisition of Sample SS-18308, the tank excavation was backfilled. <br /> The sample was delivered under chain-of-custody to Chemwest Analytical <br /> Laboratories, Inc. , in Sacramento, and analyzed for total petroleum <br /> hydrocarbons (TPH) by GC/FID and purgeable aromatic compounds (BTEX) by <br /> EPA Method 8020. Sample SS-18308 yielded a TPH concentration of 190 mg/kg <br /> diesel and was below reporting limits for gasoline. The BTEX analysis was <br /> below reporting limits for all constituents. The analytical results for <br /> the two analyses are presented in Table 1. Laboratory data sheets and a <br /> chain-of-custody form are included at the end of this report. <br /> Kleinfelder recommends a copy of this report be submitted to the San <br /> Joaquin County Local Health District for their review and approval. <br /> j3' <br /> KLEINFELDER 9795 Business Park Drive, Suite C, Sacramento, CA 95827 (916) 366-1701 -/�j ITT'1� <br /> YI 4a <br />