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enviroso <br /> These findings indicate that GWE, S hydrocarbonsEalattention n soil and ground water beneath the <br /> rocesses have successfully <br /> reduced concentrations of petroleum <br /> site <br /> Recent Ground Water Monitoring Summary <br /> Ground water monitoring and sampling for the second quarter of 1997 was conducted on <br /> April 2, 1997 Groundwater samples from Wells MW-1, <br /> MW-2 RW-1, and VE <br /> contained 0 81 ppb, 0 76 ppb, 6 3 ppb, and 1 5 ppb benzene, respectively The remaining <br /> wells were ND for benzene in ground water MTBE was detected in Wells MWA through <br /> MW-5, RW_1, VEW-1, VEW-2, and VEW-4 Halogenated volatile organics (HVOCs) <br /> were detected in Wells MW-2 MW-3, MW-4, RW-1, RW-2, and VEW-3 Petroleum <br /> hydrocarbon analytical data are s n��Pia�4 Table 2 and on Plate 3 HVOC analytical <br /> data are summarized in Table <br /> Potential Chlorinated Solvent Sources <br /> Shell Oil Products Company formerly operated a service station at the site The service <br /> station was constructed in 1955 This construction included the installation of four 4,000- <br /> gallon underground storage tanks (USTs) used to store gasoline products and one 500- <br /> gallon UST used to store used motor oil In 1963, one of the 4 000-gallon USTs was <br /> moved and two 7,500- <br /> re USTs were installed to store gasoline products The station <br /> . discontinued selling gasoline in 1981 and all five gasoline USTs were removed The waste <br /> oil UST remained in use at the site until June 1990 On June i, i 990, the waste oil UST <br /> failed a precision tank test The contents of the wastdn fled adjacent oil tank were to heed out wast on June 0 1 tank5, <br /> 1990 In September 1990, a soil boring (SB 6) oil <br /> Soil samples collected at depths of 11 5, 21 5, 31 5, and 36 5 feet below grade (fba) <br /> Boring SB 6 were analyzed for TPH-diesel, TPH-gasoline, and BTEX Petroleum <br /> hydrocarbons were o data wert detectee available in regardinof these g the collecles tion of il tank was <br /> soil he waste sample samples <br /> removed in 1991 <br /> the waste oil tank removal <br /> Based on Shell's use of the site, the former waste oil tank appears to be the only potential <br /> on-site source of HVOCs While Shell does not have any soil sample data for HVOCs in <br /> the vicinity of the former waste oil tank, the distribution of HVOCs in ground water at the <br /> site indicate the former waste oil tank is not the source of HVOCs which have impacted <br /> ground water beneath the northern <br /> ornaoiro �wr jter samples collected <br /> from the wells nearest the former elaeGroundo � OCs (Plate 4) <br /> 2 <br /> 97369 <br />