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_ T <br /> concentation occurring in U-C. Hydro�.arbon concentrations generally <br /> urri <br /> attenuate to none-detected at depths greater than 15 feet. <br /> o PACIFIC has conducted three groundwater sampling events since the <br /> installation of Monitoring Wells U-1 through U-3. Groundwater <br /> elevations at the site have risen approximately 1-1/2 feet since the first <br /> _ sampling event in November 1990. Static groundwater occurred at <br /> depths of approximately 8 feet to 9 feet below grade during the <br /> May 23,1991,sampling event,with a northerly flow direction at a <br /> gradient of 0.006. <br /> o Certified laboratory analysis of groundwater samples collected on <br /> _ May 23, 1991,indicates maximum concentrations of 3,200 parts per <br /> billion(ppb)TPH-gasoline in Well U-5,280 ppb TPH-diesel in U-6, <br /> and 56 ppb benzene in U-1. <br /> a To further define the extent of petroleum hydrocarbons in the soil and <br /> groundwater underlying the site,PACIFIC recommends the <br /> i -- installation of two additional groundwater monitoring wells located <br /> i r <br /> off-site. <br /> 3 <br /> I <br /> 3 <br /> 3 <br /> 1, M <br /> } <br /> .r <br /> 5 <br /> i <br /> 3100101/REPORT: <br /> ii September 30, 1991 <br />