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• • • <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> i <br /> Floating Change Concentrations inµg/1, m <br /> Top-of-casing Depth-to- product Water-level since last <br /> Well number elevation, water, thickness elevation, measurement, Total <br /> and date to feet(a) in feet to feet in feet(b) to feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE DO <br /> SMW_I 5024 <br /> 10/7/94 12 86 -- 3738 -- 250 110 <0 5 360 2200 -- <br /> 12/16/94 12 54 -- 3770 032 740 210 330 600 5200 -- -- <br /> 2/28/95 1240 -- 37 84 0 14 1000 330 450 790 8300 -- -- <br /> 4/26/95 1271 -- 37 53 -031 470 110 270 480 5100 -- -- <br /> 7/27/95 13 00 3724 -029 410 42 360 630 7400 -- -- <br /> 10/26/95 (c) 13 03 -- -- -0 03 <br /> 10/27/95 -- -- -- -- 640 33 440 410 7600 -- -- <br /> 2/12/96 1200 -- -- -- 390 <0 5 220 98 3800 -- -- <br /> 4/18/96 1258 -- -- -058 60 <0 5 20 7 4 500 -- -- <br /> 7/18196 1285 -- -027 200 <5 130 56 3400 60 -- <br /> 11/15/96 1340 -- -- -055 180 <2 5 62 21 2500 590 -- <br /> 3/14/97 NP 13 35 -- -- 0 05 130 <0 5 <0 5 <0 5 1700 230 0 13 <br /> 6/4/97 NP 1273 -- 062 36 3 1 14 15 520 47 005 <br /> 8/11197 — -- _ _ _ _ <br /> TEX-1 (c) <br /> 10/26/95 1286 -- -- <5 <0 5 <0 5 <0 5 <350 -- -- <br /> 2/12/96 1090 -- 1 96 -- -- -- -- -_ -- -- <br /> 4/18/96 1135 -- -- -045 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 7/18/96 1152 -- -- -017 -- -- -- -- -- -_ <br /> 11/15/96 1230 -- -- -078 <br /> 3114/97 -- -- __ <br /> 6/4/97 -- -- _- <br /> 8/11197 1171 -- -- -- _ __ _ __ __ __ 0 45 <br /> (a)All elevations corrected to an arbitrary datum based on a Notes Dash indicates not measured or sampled <br /> temporary on-site benchmark with an assigned elevation of 50 feet TPH-G=Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015,Modified <br /> (b) Corrected water level elevation value(Wlc=Wlm+(b)(p)),where Wlc=water-level BTEX Distinction by EPA Method 8020 <br /> elevation corrected,Wlm=-water-level elevation measured,b=hydrocarbon MTBE=Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> thickness (feet), p=specific gravity(0 7)of hydrocarbon DO=Dissolved Oxygen <br /> (c)Top of well casing altered Well casing has not been resurveyed P= Wells purged prior to sample collection <br /> Water level measured from the highest point of well casing NP=Wells not purged prior to sample collection <br /> Sampled during thelst and 3rd quarters of each year <br /> Wells ATR-1,ATR-3,ATR-6,ATR-9,ATR-10,and ATR-11 on a semi-annual sampling schedule. <br /> 474711 Ali[ 1 M2093AU(,7 XI_% <br />