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• i Pre-Tank Relining Site Assessment Report 2 The Southland Corporation 4627 Da Vinci Drive Stockton California March 3 1997 site (Figure 2) Angled soil borings were drilled at 25 degrees from vertical The depth of sample collection in each of the angled borings, shown on the sample numbers and listed In Table 2, has been corrected to reflect true vertical depth Each core was collected in a 2-foot-long by 1 25-inch-outside-diameter stainless steel sampling barrel lined with 1-Inch-diameter by 6-inch-long brass tube Inserts After being driven to the required sampling depth, the lead drive point of the core sampler was released and the sample barrel was pushed an additional two feet to collect the soil sample Following sample collection,the sampling barrel and drive rods were removed from the probe hole and the sleeves containing the soil samples were removed from the sampling barrel and used for soil descriptions One sample sleeve from each sample location was retained for laboratory analysis The drive rods and tools were triple rinsed with Alconox detergent and distilled water between bore holes, and all sampling equipment was cleaned between each sampling interval to reduce the potential for cross-contamination The soil from the cores was screened for hydrocarbon vapors using a photoionizatlon detector (PID) Soil was logged using the Unified Soil Classification System by a Fluor Daniel GTI field geologist working under the supervision of a California registered geologist (Appendix A) One 6-inch-long sleeve was collected from the 2-foot-long sample tube at each sampling interval sealed with tape, labeled and placed on ice in an insulated container for transport under chain-of-custody manifest to Western Environmental Science & Technology(WEST) in Davis, California for analysis Field notes are included as Appendix B A total of 18 soil samples were submitted for laboratory analysis for benzene toluene, ethylbenzene and total xylenes (BTEX), methyl-tent-butyl-ether (MTBE) and total petroleum hydrocarbons-as-gasoline (TPH-G) using EPA methods 8020/modified 8015 2 3 Groundwater Sampling Methods Following completion of the borings, groundwater samples were collected from borings GP-1 GP-5 GP-7, GP-8, GP-9, and GP-10 using a stainless steel bailer then decanted Into 40-milliliter glass vials treated with hydrochloric acid to preserve the samples The samples were sealed using Teflon®-septum caps labeled, placed on ice in an insulated container, and transported under chain-of-custody manifest to WEST Laboratories The groundwater samples were analyzed for BTEX MTBE, and TPH-G using EPA methods 8020/modified 8015 Since MTBE was detected by EPA method 8020 analysis by EPA method 8260 was used to confirm its presence Following collection of soil and groundwater samples each soil boring was grouted back to surface grade with neat cement • 0470ASMT RPT(SIM 59) FLUOR DANIEL G71