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Jonas & Associates Inc <br /> ' 2 4 2 Groundwater Samples Analytical Methods <br /> ' Groundwater samples collected from 1986 to 1996, were analyzed for TPH-G (EPA <br /> Method 8015/8020), BTEX (EPA Method 602), total lead (EPA Method 7421), <br /> ethylene dibromide (EDB) (EPA Method 504), 1,2-dichloroethane (1,2-DCA) (EPA <br /> ' Method 601/8010), and/or polynuclear aromatic hydrocarbons (PAHs) (EPA Method <br /> 610) within the allowable holding times <br /> ' Recent groundwater samples (1995/1996 samples) were also analyzed for methyl <br /> tert-butyl ether (MTBE) by EPA method 602 <br /> ' 3,0 EXTENT OF HYDROCARBON PRESENCE IN SOILS AND GROUNDWATER <br /> 31 1986 Investigations <br /> On November 14, 1986, PG&E conducted a limited tank leakage study in the <br /> ' immediate vicinity of the former UST location in conjunction with PG&E's plan to <br /> close the tank The purpose of this study was to determine whether gasoline <br /> hydrocarbons were present in the adjacent soil and groundwater The scope of the <br /> investigation included drilling two test borings approximately five feet to the north <br /> and east of the UST (B 1 and B2, see Figure 3-1)) to depths of 13 5 and 15 5 feet, <br /> and collecting soil and water samples from the borings for chemical analysis The <br /> ' depth of groundwater at the time of the investigation was estimated at approximately <br /> 8 to 9 feet (PG&E, 1988) <br /> ' A summary of analytical results are presented in Tables 3-1 and 3-2, Appendix B <br /> Soil boring logs for the 1986 investigation are included in Appendix C <br /> During the course of the November field work, hydrocarbons odors were detected <br /> ' in the subsurface soils obtained from boring B-1, and floating product was observed <br /> on the standing water in both borings (PG&E, 1988) <br /> 3 1 1 TPH-G - 1986 Analytical Results <br /> Selected soil and water samples collected from borings B-I and B-2 were submitted <br /> to a State-certified laboratory(Clayton Environmental Consultants, Inc ) for analysis <br /> of TPH-G by EPA Method 8015, BTEX by EPA Method 8020/602, EDB (EPA Method <br /> 8010/601) and lead (Method 239 2) (PG&E, 1988) <br /> 7 <br />