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EXCILTECH 41638 CHRISTY STREET- FREMONT, CA 94538 PHONE (415) 659-0404 CONTR. LIC. NO. 464324 Delta Packing of Lodi May 8, 1987 5950 E. Kettleman Lane Project 1549G Lodi, California 95240 FLTi77k Attention: Mr. Lee Mettler RE: Soil Sampling and Analysis for Tank Closure Delta Packing of Lodi C L Lodi, California F EFiMff/SERVJC_E� Dear Mr. Mettler This letter report presents the results of our soil sampling and analysis for Closure of two tanks at the above referenced site. The purpose of the investigation was to ascertain whether the tanks had leaked prior to inplace closure of the two subsur f atce a tanks. The investigation is required by the-San Joaquin County Health District. Permits for the investigation were secured from the Health District. FIELD METHODS Two exploratory borings were drilled at a 45-degree angle beneath the each tank at the locations shown on the attached Figure 1, for soil sample collection. Soil samples were collected using pre-cleaned flight augers advanced to the desired sampling interval. Soil samples were collected in a California modified sampler equipped with clean brass liners and samples collected directly beneath each tank. The sampler is pushed hydralically So into the ir I, retrieved and disassembled.The lowermost ring containing the soil sample was t immediately sealed with foil, capped and packed on ice for transport to the laboratory. Chain of custody documentation accompanied all samples. The borehole was logged using the Unified Soil Classification System, and the boring was backfilled with cement upon completion. A representative of the San Joaquin County Health District observed portions of the field work. CHEMICAL ANALYSIS One soil sample from beneath each tank was analyzed. The sample from beneath the 500-gallon leaded fuel tank was analyzed for total petroleum hydrocarbons (EPA 8015), benzene, toluene and xylene (EPA 8020), ethylene dibromide and total lead. The sample beneath the 8000-gallon tank was analyzed for total petroleum hydrocarbons (EPA 8015) and benzene,toluene and xylene(EPA 8020). All analyses were conducted at a State-certified laboratory. The analytical reports are attached. SUBSURFACE CONDITIONS Two exploratory borings were drilled at the site, the deepest of which was advanced 17.5 feet deep. The borings encountered silty sands and sands to depths of about 12 to 15 feet. Silt and clayey sands occur to the maximum depth explored. The boring logs are attached. Ground water was not observed.