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Table 1 Page 14 of 14 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Blvd,Tracy,California <br /> Floating <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 /> SMW-1 1017194 5024 1286 -- 3738 3738 2,200 250 110 <0 5 350 -- <br /> 12116/94 1254 -- 3770 032 5,200 740 210 330 600 <br /> 2128195 1240 — 3784 014 8,300 1000 330 450 790 — <br /> 4126195 1271 -- 3753 -0 31 5,100 470 110 270 480 — <br /> 7127195 1300 -- 3724 -029 7,400 410 42 360 630 — <br /> 10/26/95 (c) 1303 -- -- -- -- — — — — <br /> 10/27/95 -- 7 600 640 33 440 410 <br /> 2112196 12 00 -- - 3 800 390 <0 5 220 98 <br /> 4118/96 1258 500 60 <0 5 20 7 4 — <br /> 7118196 1285 -- 3,400 200 <5 130 56 60 <br /> 11/15/96 1340 - — — 2,500 180 <2 5 62 21 590 <br /> 3114197 NP 1335 — -- -- 1,700 130 <05 <05 <0 5 230 <br /> 614197 NP 1273 — — -- 520 36 31 1 4 1 5 47 <br /> 8111197 <br /> 11/17197 NP 1296 — -- -- <50 <0 5 <05 <0 5 'Co 5 290 <br /> 3130198 NP 1215 — — — 910 46 <05 <0 5 1 1 110 <br /> 6125198 NP 1270 - -- -- 69 2 0 666 <05 <0 5 <0 5 765 <br /> 9111196 NP 1290 -- — -- <50 <0 5 <0 5 <0 5 406 290 <br /> TEX-1 10/26/95 (c) 1286 — -- -- <350 <5 <0 5 -CO 5 <0 5 _ <br /> 2/12196 1090 -- - — — — _ .- _ _ <br /> 4118196 11 35 — -- - <50 <0 5 <0 5 <0 5 <0 5 <br /> 7118/96 1152 -- — — -- _ — — -. <br /> 11/15/96 1230 <br /> 3114197 _ <br /> 614197 <br /> 8111197 — <br /> 3130198 1100 <br /> 6/25198 100 — — — -- -- -- -- -- <br /> 9111198 -- <br /> - Indicates not measured or sampled (a)All elevations corrected to an arbitrary datum based on a <br /> TPH-G =Total Petroleum Hydrocarbons as Gasoline temporary on-site benchmark with an assigned elevation of 50 feet <br /> TOC =Top of Casing (b)Corrected water level elevation value(Wlc=WIm+(b)(p)),where Wlc=water-level <br /> MSL =Mean Sea Level elevation corrected,WIm=water-level elevation measured,b=hydrocarbon thickness(feet), <br /> MTBE =Methyl Tertiary Butyl Ether by EPA Method 8020 p=specific gravity(0 7)of hydrocarbon <br /> P P=Wells purged prior to sample collection (c)Top of well casing altered Well casing has not been resurveyed Water-level measured <br /> NP NP=Wells not purged prior to sample collection from the highest point of well casing <br /> =MtBE confrimation analytical results(by EPA 8260) <br /> 7G600-026-OO1/GW Tables <br />