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! TAW • - <br /> HISTORICAL GROUNDWATER MONITORING DATA <br /> Former ARCO Service Station No 2168 <br /> 441 Chaiter Way <br /> Stockton, California <br /> Elevation <br /> Top of Static Water Water Depth to Ethyl- Total Dissolved <br /> Well ID Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen <br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) pg/L µg/L µg/L pglL Ag/L pg/L (ppm) Observations <br /> MW-8 08/30/00 935 18 85 -950 150 115 <2 <2 <2 <2 <2 NA No FP,No S,Yes 0 <br /> 11/21/00 935 1930 -995 <50 <0 5 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes O <br /> 02/15/01 935 1883 -948 <50 <0 5 <05 <0 5 <0 5 <2 1 2 No FP,No S,O=NE <br /> 05/17/01 935 1890 -955 <50 <0 5 <0 5 <0 5 <0 5 <2 26 No FP,No S,Yes 0 <br /> MW-8B 08/30/00 961 2027 -1066 750 1,130 425 496 106 108 <2 NA No FP,No S,Yes O <br /> 11/21/00 961 2088 -1127 924[4] 241 234 525 109 <2 NA No FP,No S,Yes 0 <br /> 02/15/01 961 2088 -1127 811 [7] 159 298 490 492 <2 1 3 No FP,No S,O=NE <br /> 05/17/01 961 2024 -1063 137[5] 504 1 32 947 43 <2 25 No FP,No S,Yes 0 <br /> MW-8C 08/30/00 901 2121 -1220 1050 685 156 678 2 18 758 <2 NA No FP,No S,Yes 0 <br /> 11/21/00 901 1919 -1018 <50 0 692 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes O <br /> 02/15/01 901 2055 -1154 <50 184 1 73 <50 194 <2 20 No FP,No S,O—NE <br /> 05/17/01 901 1995 -1094 <50 0861 <05 <05 <05 <2 20 No FP,No S,Yes 0 <br /> NA =Not analyzed NS=Not sampled NE=Not evaluated O=Odor S=Sheen FP=Free product msl=mean sea level bgs=below ground surface <br /> µp/L=Analytical results in micrograms per liter <br /> Sample des! attons 141 Chromatogram Pattern Gasoline C6 C12 <br /> MW 4 34 -Well ID and sample depth(feet) [5]Chromatogram Pattern Weathered Gasoline C6 C12 <br /> W-24 MW3R-Water sample,sample depth(feet),R=Rinsate blank [6]Chromatogram Pattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6 C12 <br /> TPHG=Total petroleum hydrocarbons as gasoline [7]Chromatogram Pattern Unidentified Hydrocarbons C6 C12 <br /> =Below detection limit for analytical methods used <br /> '=Raised method reporting limit due to high analyte concentration requiring sample dilution <br /> ••=Raised method reporting limit due to matrix interference <br /> MTBE was analyzed using USEPA Method 8260 unless noted otherwise(see below) <br /> [I]=MTBE was analyzed using USEPA Method 8020 <br /> [2]=Water levels collected on 1115199,samples collected on 12/17/99 due to equipment failure <br /> [3]=Water level collected on 2125100 <br /> C lARC0121681QTRLYI7 ABLESIArco2168 QUARTERLY DATA <br /> 9 of 8 Delta 7/18101 <br />