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r� TABLE l 1 CUMULATIVE RESULTS OF GROUNDWATER SAMPLING AND ANALYSES QUIK STOP MARKET NO. 132 3555 WEST HAMMER LANE STOCKTON,CALIFORNIA I I Ethyl- Total Well Depth to Groundwater Date TPH-G Benzene Toluene benzene Xylenes MTBE CO2 Elevation Groundwater Elevation f' Sampled (ug1L) (ug/L) (uglL) {ug1L) {ugJL) (uglL) (mglL) (ft above MSL) (feet) (ft above MSL) l Well 31W-9 08/23/01 <50 <0.5 <0.5 <0.5 <0,5 <5 NR 3.15 9.7D -6.55 ' 11!30101 <50 4.0 <10 <1.0 <]0 <0.50 NR 10.46 -7.31 02/27,02 <50 <0.50 <0,50 <0.50 <1,0 <0.50 NR 9,54 -6.39 05/31102 <50 <0.50 <0.50 <0,50 Q.0 <0.50 NR 9.55 -6.4D r ' 08/30/02 <50 <0.50 <D_50 <0.50 11.0 a0,50 NR 10.53 -718 11119102 <50 <050 1.1 <0.50 1.7 1.1 NR 10.89 -7.74 03/06103 <50 <0.50 <0.50 <0,50 <1,0 0.97 NR 10,57 -7,42 05128/03 <50 <0.50 <0.50 <0.50 <1.0 1.4 NR 10,40 -7.25 09111/03 <50 <0.50 <0.50 <0.50 Q.0 4.8 NR 11.05 -7.90 01/30104 <50 <0.50 <050 <0.50 <1.0 3.9 NR 10.56 -7.41 ' 03/30104 NR <0.50 <0.50 <0.50 <0.1 2.9 NR 10.07 -6.92 06/17/04 NR <0,50 <0.50 <0.50 <I.0 1.3 NR 10.40 -7.25 09/30/04 INR <0.50 1 <0.50 <0.50 <1,0 1.5 NR 11.10 -7.95 Well mW--10 0812310] <50 <0.5 <0.5 <05 <0,5 <5 NR 3.16 9,97 -6.81 I!130101 <50 <1.0 <1,D <lp <I.0 <0.50 NR 10.50 -7.34 02/27/02 <50 <0.50 <0.50 <0.50 <I.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 m.50 <0.50 <050 <1.0 <0.50 NR 10,51 -7.35 '. 11/19/02 <50 <0.50 <0.50 <0,50 <1.0 @50 NR 10,90 4.74 03/06/03 <50 <0.50 <0.50 <0.50 <1.0 0.60 NR 10.56 -7.40 05/28/03 <50 <0.50 <0.59 <0,50 <10 0.96 NR 10.38 -7.22 09/11/03 <50 <0.50 <0.50 <0,50 <1.0 0.68 NR 11.07 -7.91 01/30/04 <50 <0.50 <0.50 @50 <1.0 3.10 NR 10.56 -7.40 03/30/04 NR NR NR NR NR 3.40 NR 10.07 -6.91 06/17/04 NR NR NR NR NR I.70 NR 10.34 -7,18 09130104 NR NR NR NR NR 1 0.80 1 NR 11.10 -7.94 Nates: In Bold denotes results from recent sampling event 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 29,2001 r PH-G denotes total petroleum hydrocarbons as gasoline MTBE denotes methyl-ten-butyl ether;from 12-3-98 MTBE analyses were performed by EPA Method 8260 NR denotes analysis not requested, NA denotes not available ug1L denotes micrograms per liter. mg1L denotes milligrams per liter <denotes not detected above listed detection limit for the method I tl denotes feet MSL denotes mean sea level COi denotes 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. 1� ***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 t and the groundwater elevation could not be calculated for well MW-8 this quarter ^Hydrocarbon reported in the gasoline range does not match the gasoline standard ^^Sample contains descrete peak in gasoline range i' �, y,[mrjrra'Q.ieso'l6aso3rQsi.v2tm3ra.md3ruQtaar4.si,:x.wr.1 Page 10 of 10