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•Table 1 Page 26 0128 ' <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) (feel,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb} <br /> MW-5 318195 104 1291 — -1187 -11 87 1,800 43 47 3 3 60 — <br /> 6095 1140 — -1036 151 1,300 55 2 7 2 3 75 — <br /> 9111195 1365 — -1261 -225 1,500 87 3 91 29 -- <br /> 1215195 1403 — -1299 -0 38 2,200 120 <10(e) 16 11 <br /> 311 SM 1082 — -978 3 21 8,200 190 19 24 800 - <br /> 6l18196 9 50 — -8 46 1 32 15,000 170 <25 <25 2,500 <250 <br /> 9125196 1230 — -11 26 -2 80 3,800 130 <5 8 4 71 <50 <br /> 1 y4196 11163 — -1059 067 4,200 88 <2 15 44 <20 <br /> 3/19197 P 718 — -514 4 45 1,400 26 5 6 4 6 9 8 -- <br /> 615197 P 8 84 — -7 80 -1 66 1,900 22 51 4 14 <10 <br /> -- <br /> 8!19197 NP <br /> 1025 -921 -141 <50 <0 5 <0 5 <0 5 <0 5 <5 <br /> 11/25/97 NP 1048 -- -944 -023 210 <0 5 <0 5 <0 5 <0 5 <5 <br /> 3120198 P 4 27 — -3 23 6 21 <50 <0 5 <0 5 <0 5 <0 5 <5 <br /> 6124/98 Well Box Inaccessable — — -- — — — <br /> 9110M P 779 — -676 — <60 <0 6 <O 6 <0 6 <0 6 <5 <br /> a =Corrected water-level elevation value where free product is present(Wic=Wlm+(b)(p)),where <br /> Wlc=+mater-level elevation corrected,Wlm=wateraevel 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 6020 <br /> DO = Dissolved Oxygen <br /> P = Well purged pnor to sample collection <br /> NP =Well not purged pnor to sample collection <br /> TOC =Top of Casing <br /> MSL =Mean Sea Level <br /> BTEX Distinction by USEPA Method 8020 <br /> Wells E-0,E-4,E-5,E-6,E-7,PR-2,BHD-2 MWA,MW-2,and MW-3 on a semi-annuat sampling schedule <br /> Sampled during the first and third quarters of each year , <br /> 7G600-019-01/GW Tables <br />