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ADDITIONAL ASSESSMENT REPORT <br /> • JAY'S M 'ff MART <br /> STOCKTON,CALIFORNIA <br /> JUNE 2003 <br /> • Collect soil samples from each boring <br /> • Analyze selected soil samples for TPH G, TPH D, Benzene, Toluene, Ethylbenzene, <br /> Xylenes (BTEX), the fuel oxygenates Methyl-tertiary-butyl-ether (MTBE), Di-asoproyl <br /> ether(D1PE), Ethyl-tertiary-butyl-ether(ETBE), Tertiary-amyl-methyl-ether(TAMM), <br /> Tertiary butanol (TBA) plus 1,2-Dichloroethane (1,2-DCA) and Ethyl dibromade (EDB) <br /> • Collect groundwater samples from each geoprobe bonng <br /> • Analyze all groundwater samples for TPH G, TPH D, BTEX, 1,2-DCA, EDB, and the <br /> fuel oxygenates <br /> • Document findings in an Additional Assessment Report for submittal to the County and <br /> Regional Board <br /> • Provide project management <br /> SOIL AND GROUNDWATER INVESTIGATION <br /> On May 22-23, 2003, three borings (SB-2 through SB-4) were completed on-site to determine if <br /> there were soil and/or groundwater impacts near the former UST, dispensers, and fuel lanes Based <br /> on conversations with the County, at was determined that if field evidence for groundwater <br /> petroleum hydrocarbon impacts were found, the borings would be converted to monitoring wells <br /> Field identification of impacted groundwater was not found during the drilling <br /> Soil samples were taken every 5-feet an each boring until groundwater was encountered <br /> Groundwater was encountered at approximately 54-feet bgs an each boring No field evidence of <br /> hydrocarbon-impacted soil was encountered an any of the soil samples The boring locations are <br /> shown on Figure 2, and copies of the boring logs are included an Appendix A The material <br /> encountered during the drilling vaned between silt, salty sand, and fine-grained sand <br /> Field indications of possible petroleum hydrocarbon impacts were determined using a portable <br /> photo ionization detector (PID) to monitor for the presence of organic vapors in soil collected from <br /> the boreholes This field screening method consisted of filling a plastic bag to approximately one- <br /> third capacity with soil and sealing the bag After allowing sufficient time for the soil vapor to <br /> equilibrate with the head space, the PID probe was inserted an the bag, and the concentrations of <br /> orgaruc vapors detected by the PID were recorded on the boring log <br /> Three soil samples from each boring were selected for lab analysis The soil sample dust above <br /> groundwater along with those from approximately 30 and 40-feet bgs were the ones selected for <br /> lab analysis <br /> 3 <br />