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0 Page�fi of 26 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station 62133 <br /> 2908 Benjamin Holt Dr,Stockton,California <br /> Well Depth Product Groundwater Groundwater Total <br /> Date Elevation to Water thickness Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MTBE DO <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgll <br /> a =Corrected water-level elevation value where free product is present(Wlc=Wlm+(b)(p)) where <br /> Wlc=water-level elevation corrected,Wim=water-level elevation measured,b=hydrocarbon thickness(in <br /> feet),p=specific gravity(0 7)of hydrocarbon <br /> — = Indicates not measured or not calculated <br /> TPH G =Total Petroleum Hydrocarbons as Gasoline by USEPA Method 8015,Modified <br /> MTBE =Methyl Tert Butyl Ether by USEPA Method 8020 <br /> DO =Dissolved Oxygen <br /> P = Well purged prior to sample collection <br /> NP =Well not purged prior to sample collection <br /> TOC =Top of Casing <br /> MSL =Mean Sea Level <br /> BTEX Distinction by USEPA Method 8020 <br /> Wells E-3, E-4, E-S E-6 E 7 PR-2 BHD-2 MW-1 MW-2 and MW-3 on a semi-annual sampling schedule <br /> Sampled during the first and third quarters of each year <br /> NO =No Data due to DO meter malfunctson <br /> 7G600-019-011GW Tables <br />