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TABLE 1 Groundwater Elevation and Analytical Data ARCO Service Station No 6080 USEPA Method 8015/8020(DHS LIi 85 Louise Avenue, Lathrop,California Top of Casing Static Water Groundwater Groundwater Ethyl- Total Well Sample Elevation Level Elevation Flow TPHg Benzene Toluene benzene Xylenes MtBE Number Date (feet msi) (feet bgs) (feet msi) Direction pglL pg/L pg/L pg/L p91L pglL MW-3 P 6/23/2000 1400 811 589 NE <50 <05 <05 <0 5 <0 5 <20 NP 9/8/2000 905 495 Flat <50 <05 <05 <0 5 <05 <2 0 NP 12/11/2000 951 449 NE <50 <05 <05 <0 5 <0 5 <2 0 P 3/22/20011 845 555 NW <50 <05 <05 <0 5 <0 5 <2 0 P 6/25/2001 891 509 E <50 <05 <0 5 <0 5 <0 5 <2 0 P 9/24/2001 994 406 E <50 <05 <05 <0 5 <0 5 <2 0 P 12/3/2001 985 415 E <50 <0 50 <0 50 <0 50 <0 50 1 6 P 3/18/2002 850 550 E-NE <50 <0 50 <0 50 <0 50 <0 50 062 P 6/20/2002 935 455 E <50 <0 50 <0 50 <0 50 <0 50 056 P 9/9/2002 953 447 SE <50 <05 <05 <05 <05 055 P 12/6/2002 1014 386 E <50 <05 <05 <05 <0 5 18 P 3114!2003 950 450 NE <50 <05 <05 <05 <0 5 <0 50 P 6/8/2003 903 497 E-NE <50 <05 <05 <05 <0 5 <0 5 P 9/15/2003 998 402 SE <50 <0 5 <05 <05 <0 5 <0 5 P 12/4/2003 973 427 SE <50 <0 5 <05 <05 <0 5 <0 5 Notes Chromatogram Pattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6-C12 z Chromatogram Pattern Unidentified Hydrocarbons C6 C12 < = Below detection limit for the analytical methods used ' =Beginning 3!1412003-TPHg and BTEX analyzed by EPA Method 8260B bgs = below ground surface msi = mean sea level P/NP = Purged/Not Purged TPHg = Total petroleum hydrocarbons as gasoline(reported as GRO gasoline range organics) pg/L = micrograms per Liter Data Qualifier Definitions U The analyte was analyzed for,but was not detected above the sampie reporting limit J The analyte was positively identified,the associated numerical value is the approximate concentration of the analyte in the sample N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a "tentative Identification" NJ The analysis indicates the presence of an analyte that has been"tentatively identified"and the associated numerical value represents its approximate concentration UJ The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is approximate and mayor may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample R The sample results are refected due to identification or other analytical issues ND Not detected above reported detection limit I K 1WprocessU5 8P ARC01060801Quanerlyl4 QTR 0316060 GWMR 4Q03 2of2