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Table 1 <br /> Page34 of 34 ~ <br /> Groundwater Elevation and Analytical Data <br /> r <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) mg/l <br /> MW-5 318195 104 1291 — -1187 -1187 1,800 43 47 33 60 -- -- <br /> 6/2195 1140 — -1036 151 1,300 55 27 23 75 —9/11/95 1365 — -1261 -225 1,500 87 3 91 29 — -- <br /> 1215/95 1403 — -1299 -038 2,200 120 <10(e) 16 11 — — <br /> 3118196 1082 -- -978 3 21 8,200 190 19 24 800 — — <br /> 6118196 950 — -846 132 15,000 170 <25 <25 2,500 <250 — <br /> 9125196 1230 — -1126 -2 80 3,800 130 <5 84 71 <50 — <br /> 1214196 11 63 — -1059 067 4,200 88 <2 15 44 <20 - <br /> 3119/97 P 718 -- -614 445 1,400 26 56 46 9 8 — 011 <br /> 615197 P 884 — -780 -166 1,900 22 51 4 14 <10 017 <br /> 8119197 NP 1025 — -921 -141 <50 <0 5 <0 5 <0 5 <0 5 <5 018 <br /> 11/25/97 NP 1048 — -944 -023 210 <0 5 <05 <05 <0 5 <5 — <br /> 3120/98 P 427 — -323 621 <50 <0 5 <0 5 <0 5 <0 5 <5 22 <br /> 6124198 Well Box Inaccessable -- -- -- — — — — — — <br /> 9/10/98 P 779 — -675 -- <50 <0 5 <0 5 <0 5 <0 5 <5 — <br /> 12/17/98 P 8 06 — -702 -027 99 5 <0 5 <0 5 <0 5 <0 5 <5 — <br /> 3110199 P 686 — -482 220 806 <05 <05 <06 <05 <6 28 <br /> a =Corrected water-level elevation value where free product is present(Wlc=Wlm+(b)(p)),where Wic=water-levet elevation corrected,Wlm=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 /> 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 /> MSI. =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 MW-1,MW-2,and MW-3 on a seml-annual sampling schedule <br /> 7G600-019-03/GW Tables <br />