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i Canepa's Car Wash 248 E Park Street, Stockton, California aka. 642 N. Hunter Street Phase HSite Characterization and July 2, 1994 Quarterly Groundwater Report(May 1994) Page: 6 laboratory Care was taken to ensure that no air space existed in the vials by Iinverting to check for bubbles and re-sampling as necessary The samples were analyzed or extracted within 14 days according to their EPA methods Water samples collected for analysis were analyzed by EPA method 602. for BTX&E compounds, method 5030/modified 8015 for gasoline range hydrocarbons, and method 3 510 for diesel range hydrocarbons The muumum ' detection limits used for each analyte were 0 5 u&g for BTX&E, 0 5 mg/l for gasoline, and 0 05 mg/kg for diesel Analyses were conducted by Geo-Morutor of Hesperia, California, a State certified laboratory 4.0 Soil Conditions ' This site, at 248 E Park Street, Stockton, California, is located in the northern end of California's San Joaquin Valley This area is monotonous geologically, representing primarily, the alluvial flood and delta plains of the major rivers and tributaries of the region The region persisted as a lowland or shallow marine embayment during the entire Cenozoic period The surface of the Valley is composed of unconsolidated Quaternary sediments The Soil Survey completed in 1988 by the U S Department of Agriculture, Soil ' Conservation Service, generally classify the soil types as being Jacktone, HoIlenbeck or Stockton types Generally, these soils are somewhat poorly to moderately well-drained, fine texture soils that are moderately deep to deep, down to a cemented hardpan ' The hthologic units encountered in these bonngs were interbedded inorganic micaceous clayey silts and silty clays with numerous sands and silty, clayey sands of varying ' thicknesses This is typical of the valley fill deposits in the region Analysis of soil samples show B-1, 2 & 5 to have the lughest levels of contamination, ' while B- 3 & 6 and MW-1 & 2 had significantly lower levels Boring B-3 and MW-3 are approaching the lateral limits of contamination B-4 was the only boring that analyzed non-detect for all tested compounds Analyses of soil samples from MW4, 5, 6 and 7 ' define the lateral limit of soil contamination, with the exception of a thin sand lens at 25 feet in MW-6 (Figures 9 & 11, Table 1, Appendix A) 1