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ADDITIONAL ASSESSMENT REPORT JAY'S MINI MART STOCKTON,CALIFORNIA NNE 2003 The samples from approximately 30 and 40-feet were selected because this was the depth in soil bonng B-1 where the largest impacts were found during the September 2000 subsurface investigation Sod samples were collected using a California spht-spoon sampler every 5-feet in brass tubes sealed with plastic end caps and Teflon tape The soil samples were labeled in accordance with EPA protocol and stored in a pre-cooled ice chest at 4° Centigrade or less The soil analytical data is summarized in Table 1 and the laboratory data are included in Appendix B Groundwater samples were collected from all three borings As mentioned earlier, groundwater was encountered at approximately 54-feet bgs in each borehole Groundwater samples were collected from each boring using a new disposable bailer Groundwater data are summarized in Table 2 and the laboratory data are included m Appendix B All borings were properly abandoned with a neat cement grout under County supervision Soil and groundwater samples were placed into appropriate laboratory prepared containers, using proper sample handling and chain-of custody(COC)protocol established under applicable USEPA procedures The samples were labeled with the date, time, and identifying boring number, stored in a cooler at 4° Centigrade or less, and transported to a California State-certified laboratory, under completed COC documentation The soil and groundwater samples were analyzed for TPH G and TPH D using EPA Method 8015 Modified and for BTEX, 1,2 DCA, EDB and the oxygenated fuel additives including MTBE, DIPE, TAME, ETBE, and TBA using EPA Method 8260B The analyses were conducted by SunStar Laboratories, Inc , a California State-certified laboratory in accordance with state guidelines and EPA protocol SOIL ANALYTICAL RESULTS The soil samples from SB-2, which was located east of the tank pit, were all non-detect (ND) The soil samples from SB-3, which was located along the former dispenser piping, had varying levels of reported petroleum hydrocarbon constituents The soil samples from SB-4, which was located just south of the westernmost former dispenser, reported MTBE in the 35 and 40-foot samples No TPH G or TPH D was reported many of the soul samples Benzene was reported in the 35 and 40-foot samples from SB-3 at 120 micrograms per kilogram (ug/kg) and 46 ug/kg, respectively Ethylbenzene and total xylenes were also reported in the 35-foot sample from SB-3 at 31 ug/kg and 165 ug/kg, respectively Ethylbenzene was also reported in the 40-foot sample from SB-3 at 22 ug/kg All three soil samples from both SB-2 and SB-4 were ND for all BTEX constituents MTBE was reported in the three soul samples from SB-3 at 28 ug/kg in the 35-foot sample, 20 . ug/kg in the 40-foot sample and 5 2 ug/kg in the 50-foot sample The 35 and 40-foot samples from SB-4 also reported MTBE at 35 ug/kg and 36 ug/kg, respectively All other oxygenates were ND in all soil samples 1,2-DCA and EDB were also ND m all soil samples 4