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0 Pag9of 28 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2133 <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 <br /> Sampled (feet,MSL) (feet,TOC) In feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-5 9125196 1230 — -11 26 -2 80 3,800 130 <5 8 4 71 <50 <br /> (cont) 1214196 11 63 — -1059 0 67 4,200 88 <2 15 44 <20 <br /> 3119197 P 718 -614 445 1,400 25 5 6 46 9 8 — <br /> 615197 P 884 — -7 80 -166 1,900 22 51 4 14 <10 <br /> 8119197 NP 1025 -- -9 21 -141 <50 <0 5 <05 <0 5 <0 5 <5 <br /> 11/25/97 NP 1048 - -9 44 -023 210 <0 5 <0 5 <05 <05 <5 <br /> 3120198 P 427 — -3 23 6 21 <50 <0 5 <0 5 <0 5 <0 5 <5 <br /> 6124188 Well Box Inaccessable -- -- — -- — — — — <br /> a =Corrected water-level elevation value where free product is present(V.lc=Wlm+(b)(p)),where <br /> Wlc=water-level elevation corrected,Wlm=+mater-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 /> 00 =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-5,E-6,E-7,PR 2,BHD-2 MWA,MW-2,and MW-3 on a semi-annual sampling schedule <br /> I <br /> Sampled during the first and third quarters of each year <br /> 7G600-419-01/GW Tables <br />