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T19 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 DO <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg11) <br /> SMW-1 10!7194 5024 1286 -. 3738 3738 2,200 250 110 <0 5 360 <br /> 12!16194 1254 — 3770 032 5,200 740 210 330 600 -- <br /> 2128195 1240 - 3784 014 8,300 1000 330 450 790 -- -- <br /> 4126195 1271 — 3753 -031 5,100 470 110 270 480 — -- <br /> 7127195 13 00 -- 3724 -029 7,400 410 42 360 630 -- -- <br /> 10l26/95 (c) 1303 <br /> 10/27/95 — - — 7,600 640 33 440 410 — <br /> 2112196 1200 3,800 390 <05 220 98 -- <br /> 4118191 1258 500 60 <05 20 74 — — <br /> 7/18/96 1285 -- 3,400 200 45 130 56 60 — <br /> 11115196 1340 -- - 2,500 180 <2 5 62 21 590 <br /> 3114197 NP 1335 — - 1,700 130 <0 5 <0 5 <0 5 230 013 <br /> 614197 NP 1273 - — - 520 36 31 1 4 1 5 47 005 <br /> 8111197 <br /> 11/17/97 NP 1296 — -- <50 <0 5 <0 5 <0 5 <0 5 290 <br /> 3130198 NP 1215 - - 910 4 6 <0 5 <0 5 1 1 110 1 6 <br /> 6125198 NP 1270 -- — 692 0 666 <0 5 <0 5 <0 5 765 1 6 <br /> 9111198 NP 1290 _ <50 <0 5 <0 5 <0 5 <0 5 290 1 7 <br /> 12/15198 -- <br /> T EX-1 10/26/95 (c) 1286 -- <350 <5 <0 5 <0 5 <0 5 — <br /> 2/12/96 1090 - - .- _ — _ <br /> 4/18196 11 35 — -- <50 <0 5 <0 5 <0 5 <0 5 -- — <br /> 7118196 1152 -- — -- _ __ — _ <br /> 11/15/96 1230 <br /> 3114197 — <br /> 614197 <br /> 8111197 — <br /> 3/30198 1100 <br /> 6/25198 100 <br /> 9/11198 <br /> 12/15198 1147 -- — _ .. _ _ .. _ .. p 1 <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(WIc=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 pnor to sample collection (c)Top of well casing altered Well casing has not been resurveyed Water-level measured <br /> NP NP=Wells not purged pnor to sample collection from the highest point of well casing <br /> * =MtBE confrimation analytical results(by EPA 8260) <br /> DO = Dissolved Oxigen <br /> 7G600-026-001/GW Tables <br />