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TABLE 1 ' CUMULATIVE RESULTS OF GROUNDWATER SAMPLING AND ANALYSES . QUIK STOP MARKET NO. 132 2555 WEST HAMMER LANE STOCKTON,CALIFORNIA Ethyl- Total Well Depth to Groundwater Date TPH-G Benzene Toluene benzene Xylenes MTBE CO2 Elevation Groundwater Elevation Sampled (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (mg(L) (ft above MSL) (feet) (ft above MSL) Well MW-10 ' 08/23101 <50 <0.5 <0.5 <0.5 <0.5 <5 NR 3.16 9.97 -6.81 11/30/01 <50 <t.0 <1.0 <1.0 <1.0 <0.50 NR 10.50 -7.34 02/27/02 <50 <0.50 <0.50 <0.50 <1.0 <0.50 NR 9.58 -6.42 05/31/02 <50 <0.50 <0.50 <0.50 <1.0 <0.50 NR 9.56 -6.40 08/30/02 <50 <0.50 <0.50 <0.50 <1.0 <0.50 NR 10.51 -7.35 11/19/02 <50 <0.50 . <0.50 <0.50 <1.0 <0.50 NR 10.90 -7.74 Notes: Well MW-8 was installed on 11-19.99 and surveyed by Siegfried Engineering Inc.on 12-9-99;MW-2,MW-5,and MW-6 were also surveyed. Wells MW-9 and MW-10 were installed on August 7,2001 and surveyed by Morrow Surveying on August 29,201 H-G denotes total petroleum hydrocarbons as gasoline MTBE denotes methyl-tert-butyl ether:from 12-3-98 MTBE analyses were performed by EPA Method 8260 ' R denotes analysis not requested. NA denotes not available ug/L denotes micrograms per liter. mg/L denotes milligrams per liter <denotes not detected above listed detection limit for the method tt denotes feet MSL denotes mean sea level CO=dentes carbon dioxide •Due to construction activities,the well MW-8 elevation has been changed,but the well could not be resurveyed prior to this monitoring event. Because MW-8 needs to be resurveyed,the groundwater elevation for MW-8 could not be determined. ** MW-8 was recently paved over by the City of Stockton preventing access to it. ATC was unable to collect a sample from this well and the groundwater elevation could not be calculated for well MW-8 this quarter r isu+n,i••,i•Q"itsi„ptnlsayigsi:Zro(>u3lcntkwt"rlui+,<i:uro.uri"i Page 10 of 10