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• TAIV HISTORICAL GROUNDWATER MONITORING DATA Former ARCO Service Station No 2168 441 Charter Way Stockton,California Elevation Top of Static Water Water Depth to Ethyl- Total Dissolved Well ID Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen &Sample Date nisl) (feet bgs) (feet msl) (feet bgs) lig/L ug/L pg/L pg/L µg/L µg/L (ppm) Observations MW-8 8/30100 9 35 1885 -950 15 0 115 <2 <2 <2 <2 <2 NA No FP,No S,Yes 0 11/21/00 935 1930 -995 <50 <0 5 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes O 2115/01 935 1883 -9 48 <50 <0 5 <0 5 <0 5 <0 5 <2 12 No FP,No S,O=NE 5/17101 935 1890 -955 <50 <0 5 <0 5 <0 5 <0 5 <2 26 No FP,No S,Yes O 8116/01 935 2012 -1077 <50 <05 <05 <05 <05 <2 09 No FP,No S,NoO MW-813 8130/00 961 2027 -1066 750 1,130 425 496 106 108 <2 NA No FP,No S,Yes O 11/21/00 961 2088 -11 27 924[4] 241 234 52 5 109 <2 NA No FP,No S,Yes 0 2115/01 961 2089 -1127 811 [7] 159 29 8 490 492 <2 13 No FP,No S,O=NE 5/17/01 961 2024 -1063 137[5] 504 1 32 947 43 <2 2 5 No FP,No S,Yes O 8/16101 961 2164 -1203 63 12 079 76 42 <2 1 8 No FP,No S,Yes 0 MW-8C 8130/00 901 21 21 -1220 1050 68 5 15 6 678 2 18 758 <2 NA No FP,No S,Yes O 11/21/00 901 19 19 -10 18 <50 0 692 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes O 2115/0 t 901 2055 -1154 <50 184 1 73 <50 1 94 <2 20 No FP,No S,O=NE 05/17/01 901 1995 -1094 <50 0 861 <0 5 <0 5 <0 5 <2 20 No FP,No S,Yes O 8/16/01 901 2141 -1240 <50 071 <0 5 <0 5 <0 5 <2 44 No FP,No S,No 0 NA �Not analyzed NS=Not sampled NE=Not evaluated O=Odor S=Sheen FP—Free product msl=mean sea level bgs=below ground surface pg/L=Analytical results in micrograms per liter Sample designations [4]Chromatogram Pattern Gasoline C6 C12 MW 4 34 Well ID and sample depth(feet) [5]Chromatogram Pattern Weathered Gasoline C6 C12 W 24 MW3R Water sample sample depth(feet),R=Rrnsate blank [6]Chromatogram Pattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6 C12 TPHG=Tatat petroleum hydrocarbons as gasoline [7]Chromatogram Pattern Unidentified Hydrocarbons C6 C12 =Below detection limit for analytical methods used '=Raised method reporting limit due to high analyte concentration requiring sample dilution *•=Raised method reporting limit due to matrix interference MTBE was analyzed using USLPA Method 8260 unless noted otherwise(see below) (l]=MTBE was analyzed using USEPA Method 8020 (2]=Water levels collected on 11/5/99,samples collected on 12/17/99 due to equipment failure [3]=Water lex el collected on 2125!44 Arco2168 QUAR I ERLY DAI A XLS Delta 8 of 8