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Report of Additional Site Assessment 2 <br /> 7-Eleven Store No 17647, 1048 W Yosemite Ave , Manteca,CA Apnl 24,2002 <br /> 23 Soil Sample Collection <br /> Soil samples were collected at 15 feet below grade in boring GP-6 and at 18 feet below grade in boring <br /> GP-7 The samples were then sealed using Teflon septum caps, labeled with the job identification <br /> ' number, the sample number,date,time, and type of laboratory analysts required The samples were <br /> stored on Ice and transported with a chain-of-custody record to a state-certified laboratory for analysis <br /> ' Groundwater samples were analyzed for benzene, toluene, ethylbenzene, total xylenes (BTEX) and total <br /> petroleum hydrocarbons as gasoline (TPH-G) using EPA method 802013/modified 8015, and for methyl <br /> tertiary butyl ether (MTBE) and 1-2-dichloroethane (1,2-DCA) using EPA method 8260B Copies of the <br /> drilling logs can be found in Appendix A <br /> ' 24 Groundwater Sample Collection <br /> ' Groundwater samples were collected in both borings using Hydropunch equipment Groundwater <br /> samples were placed in analysis-specific containers with analysis-specific preservative The samples <br /> were then labeled with the job identification number, the sample number, date, time, and type of <br /> laboratory analysis required The samples were stored on ice and transported with a chain-of-custody <br /> record to a state-certified laboratory for analysis Groundwater samples were analyzed for BTEX and <br /> ' TPH-G using EPA method 8020B/modified 8015, and for MTBE and 1-2, DCA using EPA method 8260B <br /> ' 30 RESULTS <br /> 31 Geology and Hydrogeology <br /> The site is located in the central part of the San Joaquin Valley The shallow stratigraphy in the area <br /> ' consists of Quaternary alluvium and lake deposits The materials encountered during recent drilling at <br /> the site generally consisted of silty fine sand, grading downward to medium-grained sand to a depth of <br /> ' about 15 feet below grade Clay soils underlie the sandy strata at depths of 19 feet below grade <br /> (Appendix A) <br /> ' During drilling, groundwater was encountered at approximately 13 feet below grade <br /> 17647sardoc <br /> 1 <br />