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Mr Jim Woodward <br /> April 19, 1995 <br /> Page 2 <br /> I <br /> Analytical results of the groundwater samples for this and previous quarters are summarized <br /> in Table 3 The March 1, 1995 analytical results are shown on Figure 2 Laboratory reports <br /> are included in Exhibit A Analytical results identified BTEX compounds to each <br /> groundwater sample at concentrations ranging from 0 37 micrograms per liter(µg/1) to 2 3 µg/1 <br /> of benzene, 18 to 13 µg/1 of toluene, 0 49 to 3 2 µgll of ethylbenzene, and 3 3 to 21 µg/1 of <br /> total xylenes TPH-G was identified in the groundwater samples collected from MW-2 and <br /> MW-3 at concentrations of 61 µg/l and 100µg/l, respectively TPH-D and TPH-MO were not <br /> i <br /> detected in any of the groundwater samples <br /> A duplicate sample was collected from well MW-2 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-1 indicate no <br /> detectable concentration of petroleum hydrocarbons <br /> Discussion <br /> Concentrations of BTEX and TPH-G remain low Detectable concentrations of TPH-G has <br /> been identified to the groundwater sample collected from well MW-2 for the first time since <br /> sampling began in May, 1994 Since gasoline products have not been stored at this site in <br /> 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 <br /> If you have any questions regarding this report, please contact me at (916) 4440123 <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> ial , 94�-- <br /> Pat G Cullen, R G #4932 <br /> Project Manager <br /> PGC TMB ksc <br /> Enclosures <br /> cc Ms Tina Bauer, Brown and Caldwell <br /> 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!lits <br /> document <br /> Em 422\REPORTS195QTRRMST95QTRRPT <br />