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Mr Jim Woodward <br /> July 24, 1995 <br /> Page 2 <br /> Analytical results of the groundwater samples for this and previous quarters are summarized <br /> in Table 3 The June 14, 1995 analytical results are shown on Figure 2 Laboratory reports <br /> are included in Exhibit A Analytical results identified BTEX compounds in each <br /> groundwater sample at concentrations ranging from 2 1 micrograms per liter (ug 1) to 38 µg/1 <br /> of benzene, 9 4 to 79 pg/l of toluene, 2 2 to 11 pg/l of ethylbenzene, and 12 to 59 pg/i of total <br /> xylenes TPH-G was identified in the groundwater samples collected from MW-1 and MW-3 <br /> at concentrations of 350 pg/l and 140 pg/l, respectively TPH-D and TPH-MO were not <br /> detected in any of the groundwater samples. <br /> A duplicate sample was collected from well MW-3 and analyzed by the same EPA Methods <br /> listed above Comparison of the initial and duplicate sample results are within acceptable <br /> guidelines Analytical results from a field blank sample collected at well MW-2 indicate no <br /> detectable concentration of petroleum hydrocarbons <br /> Discussion <br /> Concentrations of BTEX and TPH-G increased this quarter Detectable concentrations of <br /> TPH-G has been identified in the groundwater sample collected from well MW-2 for the first <br /> . time since sampling began in May, 1994 Since gasoline products have not been stored at <br /> this site in the past and analytical results from past soil investigations did not indicate gasoline <br /> constituents in soil samples, an off-site source of BTEX and TPH-G cannot be dismissed. <br /> Off-site potential sources are currently being investigated A database file search indicated <br /> that several sites exist upgradient that could potentially be an off-site source of gasoline <br /> constituents Additional investigation of these potential off-site sources is continuing into the <br /> third quarter 1995 <br /> If you have any questions regarding this report, please contact me at (916) 4440123. <br /> Sincerely, <br /> B OWN AND CALDWELL <br /> Pat G Cullen, R.G. #4932 <br /> Project Manager <br /> PGC TMB ksc <br /> Enclosures <br /> cc- Mr Steve Sasson, San Joaquin County Environmental Health Department <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> E\1422\REPORTS195QTRIUyraND95QFR_Tr <br />