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S <br /> March 28, 1991 <br /> Quik Stop Market No. 120 Page 3 <br /> Project No. 3-49120-31 <br /> Uiseussian <br /> 991 at <br /> Groundwater in the monitoring wells at the ow hesemeasured <br /> sti ngcground surface.n March 5� l These <br /> depths ranging from 44.70 to 45.66 feet Delo <br /> depths correspond to elevations of 33.42 to �oundwater 3.65 feIsurfacen rose and basedupon <br /> of <br /> available survey data. The apparent g <br /> approximately 0.33 feet since the <br /> i cdominant flow di ectio to he soious sampling. tuthwestours s1;ow a <br /> gently inclined gradient with a pr <br /> on <br /> The March 1991 analytical results revealed that dtectable petroleum levels in monitoring well MW-Ioandfell <br /> concentrations have remained , nondetectabl <br /> to nandetectable levels in monitoring wells MW-2 and MW-3 since the previous <br /> sampling. maintains <br /> for Petroleum <br /> ing water <br /> The State of California Departmentrninant levels e[MCr Services <br /> and action levels [ALI) for Petr DHS <br /> standards {maximum contamm <br /> hydrocarbon compounds in drinking water. The following is a list of the Curren <br /> drinking water standards for BTBX: <br /> Corn ound Concentrations <br /> 1.0 ppb MCL <br /> Benzene 100 ppb AL <br /> Toluene S$0 ppb MCL <br /> Ethyl benzene 1,750 ppb MCL <br /> Total Xylenes <br /> None of these compounds were detected in the groundwater samples obtained from this <br /> site, <br /> groundwater sampling will be conducted in June 1991. <br /> The next quarterly <br />