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i concentation occurring in U-C. Hydrocarbon concentrations generally <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-I through U-3. Groundwater <br /> elevations at the site have risen approximately 1-1/2 feet since the first t <br /> F a sampling event in November 1990. Static groundwater occurred at <br /> 3 depths of approximately 8 feet to 9 feet below grade during the i 4Y <br /> f May 23, 1991,sampling event,with a northerly low direction ata <br /> gradient of 0.005. <br /> r <br /> o Certified laboratory analysis of groundwater samples collected on <br /> ' May 23, 1991,indicates rawdmum 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. i <br /> o To further define the extent of petroleum hydrocarbons in the soiI.and <br /> groundwater underlying the site,PACIRC recommends the <br /> installation of two additional groundwater monitoring wells located <br /> - off-site. <br /> f y s Sr i <br /> i r . <br /> Y <br /> r <br /> 3100101/REPORT' ii September 30,1991 <br />