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SA Palo of 26 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2133 <br /> 2908 Benjamin Holt Dr,Stockton,Californla <br /> Well Depth Product Groundwater Groundwater Total <br /> Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xyfenes MTBE 00 <br /> Sampled (feet,MSL) (feet,TOC) In feet (feet,MSL) (feet) (Ppb) (ppb) (ppb) (Ppb) (ppb) (Ppb) mg/l <br /> MW-5 3/8195 104 1291 — -1187 -1187 1,800 43 47 3 3 60 -- — <br /> 612195 1140 — -1036 1 51 1,300 55 27 23 75 — — <br /> 9111195 1365 — -1261 -2 25 1,500 87 3 91 29 — - <br /> 1215195 1403 — -1299 -038 2,200 120 <10(e) 16 11 — -- <br /> 3118l96 1082 — -9 78 3 21 8,200 190 19 24 800 — — <br /> 6118196 9 50 -- -846 132 15,000 170 <25 <25 2,500 <250 — <br /> 9/25196 1230 — -1126 -280 3,800 130 <5 8 4 71 <50 — <br /> 1214196 1163 — -1059 0 67 4,200 88 <2 15 44 <20 — <br /> 3/19197 P 718 — -614 445 1,400 26 56 4 6 9 8 — 011 <br /> 6!5197 P 884 -- -7 80 -1 66 1,900 22 51 4 14 <10 017 <br /> 8/19197 NP 1025 — -9 21 -141 <50 <05 <0 5 <0 5 <0 5 <5 018 <br /> 11/25/97 NP 1048 — -944 -0 23 210 <0 5 <0 5 <0 5 <05 <5 — <br /> 3(20/98 P 427 — -323 6 21 <50 <0 5 <0 5 <0 5 <0 5 <5 22 <br /> 6124198 Well Box Inaccessable -- — -- — — — — — — <br /> 9110M P 779 — -675 — <50 <05 <0 5 <0 5 <0 5 <5 -- <br /> 12117l98 P 8 06 — -7 02 -027 995 <0 5 <05 <0 5 <0 5 <5 -- <br /> 3110199 P 586 — 482 220 806 <0 5 <0 5 <0 5 <0 5 <5 2 8 <br /> 0122199 — Well Box Inaccessable — — — — — — — <br /> a =Corrected water-level elevation value where free product Is present(Wlc=Wlm+(b)(p)),where Wlc=water-level elevation corrected,Wim--water-level elevation measured, <br /> b=hydrocarbon thickness(€n 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-0,E-4,ES,E-6,E-7,PR-2,BHD-2 MW-1,MW-2,and MW-0 on a seml-annual sampling schedule <br /> I <br /> 1 <br /> 077 41 727 005/GW Tables <br />