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Tata Page 28 <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 DO <br /> Sampled (feet,MSL} (feet,TOC) In feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgll <br /> MW-5 318195 104 1291 — -11187 -11 87 1,800 43 47 3 3 60 — — <br /> 6ly95 11 40 — -1036 151 1,300 55 2 7 23 75 r — <br /> 9111195 1365 — -1261 -225 1,500 87 3 91 29 — — <br /> 12&95 1403 — -1299 -038 2,200 120 <10(e) 16 11 — <br /> ~ <br /> 3118/96 1082 — -978 321 8,200 190 19 24 800 <br /> 6118196 950 — -846 132 15,000 170 <25 <25 2,500 <250 — <br /> 9/25196 1230 — -1126 -280 3,600 130 <5 8 4 71 40 —1214196 11 63 -- -10 59 067 4,200 88 <2 15 44 <20 — <br /> 3119197 P 7 18 — -614 445 1,400 26 56 46 98 01 <br /> 615197 P 884 — -780 -166 1,900 22 <br /> 8119197 N P 10 25 — -9 21 -1 41 <50 <0 5 <00 5 a 0 2 <br /> 5 <0 5 <5 4 14 <10 0 2 <br /> < <br /> 11/25/97 NP 1048 -- -944 -023 210 <0 5 <0 5 <0 5 <0 5 <5 <br /> 3120198 P <br /> 427 — -323 621 <50 <0 5 <0 5 <0 5 <0 5 <5 22 <br /> 6/24/98 Well Box Inaccessable -- — - — <br /> <50 <0 5 <0 5 <0 5 <0 5 <5 <br /> 9110198 P 7 79 — -675 <br /> 12/17/98 P 806 — -702 -027 995 <0 5 <0 5 <0 5 <0 5 <5 — <br /> 3110199 P 586 — -4 82 220 806 <0 5 <0 5 <0 5 <0 5 <5 28 <br /> 6r2ygg _ Well Box Inaccessable -- — — — — <br /> 9113l99 — Well Box Inaccessable — '- -- — <br /> 12/16199 P 926 — -821 — 186 0918 <0 6 <0 6 103 <2 6 33 <br /> a =Corrected water-level elevation value where free product is present(Wlc=WIm+(b)(p)),where Wlc=viater-level elevation corrected,Wim=water-level elevation measured, <br /> b=hydrocarbon thickness(in 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,E4,E-5,E-6,E-7,PR-2,BHD-2 MW-1,MW-2,and MW-3 on a semi-annual sampling schedule <br /> 077 41727 006/GW Tables <br /> I <br />