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r <br /> s <br /> t <br /> Ground water samples collected from all twelve wells were <br /> analyzed for total petroleum hydrocaandnxyleness as s (HTEX)oline .TpH-o <br /> and benzene, to ethylbenzene, Well hSVJ-5 was also <br /> in addition to TPIi-G and BTEX, Monitoring total <br /> sampled for conductivity, total Suspended solids, <br /> dissolved solids, chemical oxygen demand, dissolved oxygen, <br /> Ii far acquisition of National Pollutant Discharge <br /> and p mit to discharge into the storm drain. <br /> Elimination systems perles collected from all twCalifornia•lve wells were <br /> s <br /> Ground water <br /> samples of San Ramon, <br /> analyzed at Chromalab, Inc. <br /> DISCDgSTO2d round <br /> previous quarterly g <br /> The laboratory results for. ng thieventsare summarized in <br /> water monitoring and sampling resenting <br /> Table I. The water samgiingandeabservationsald survey spwell as the <br /> are <br /> the results of the sampling record, <br /> official laboratory reports and chain of custody <br /> included in Appendix A. <br /> based on the depth to ground <br /> A ground water elevation map, 1991 is presented <br /> general hydraulic gradient direction at the <br /> water measurements collected on June 2 r r <br /> in figure 2. The g event is to the <br /> site, as calculated from averasemhydraulic gradient of <br /> north-northwest, with Figure <br /> g " petroleum <br /> 0.0073 foot/ciated concentrations ofndissolved epl loleum ns <br /> and the ass <br /> hyrocarbon constituents. <br /> Results of this ground water monitoring and laboratory <br /> analysis indicate the following: ling <br /> a ed i <br /> Free Y ith a was thicknessvof O.06rfoo uriGgro Ground water <br /> event with hest concentrations of <br /> samples from MW-3 had the hip and xylenes. in February <br /> TPH-Gr toluene, ethylbenzedu <br /> 1991, no sheen or free product was observed in M`4-3• <br /> � June 1991, the concentrations <br /> Between February 1991 and <br /> of total petroleum hydrocarbons as gasoline (THin Mw-4; <br /> benzene, and xylenes have apparently increased :i. M <br /> TpH-G and xylenes increased in MW-6. <br /> - <br /> les from MW-1, MW-2r MW-7r <br /> � ground water samples <br /> BTEX constituents were <br /> No concentrations _ <br /> detected Wg 3, and AMW-4. <br /> At,,14.y_1, AMW-2, AMY' <br /> ® Between the last two sampling eventsr the <br /> concentrations of TPH-G and BTEX constituents have <br /> 3 <br />