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TA 191 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 msl) (feet bgs) (feet msl) (feet bgs) µg/L µg/L µg/L µg/L µg1L µg/L (ppm) Observations MW-8 8130100 935 1985 -950 ISO 115 <2 <2 <2 <2 <2 NA No FP,No S,Yes 0 11/21/00 1930 -995 <50 <0 5 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes 0 2/15/01 1883 -948 <50 <0 5 <0 5 <0 5 <0 5 <2 12 No FP,No S,O=NE 5/17/01 1890 -955 <50 <0 5 <0 5 <0 5 <0 5 <2 26 No FP,No S,Yes 0 8/16/01 20 12 -1077 <50 <0 5 <0 5 <0 5 <0 5 <2 09 No FP,No S,No 0 12/6/01 1829 -894 <50 <0 50 <0 50 <0 50 <0 50 <0 50 16 No FP,No S,Yes 0 2114/02 1927 -992 <50 <0 50 <0 50 <0 50 <0 50 <0 50 3 1 No FP,No S,No 0 MW-813 8/30/00 961 2027 -1066 750 1,130 425 496 106 108 <2 NA No IP,No S,Yes O 11121100 2088 -1127 924[4] 241 234 525 109 <2 NA No FP,No S,Yes O 2115/01 2088 -1127 811 [7] 159 298 490 492 <2 13 No FP,No S,O=NE 5117/01 2024 -1063 137[5] 504 132 947 43 <2 25 No FP,No S,Yes 0 8/16101 2164 -1203 63 12 079 76 42 <2 18 No FP,No S,Yes 0 1216/01 2258 -1297 94[8] 40 <0 50 5 5 17 <0 50 1 1 No FP,No S,Yes 0 2/14/02 21 06 -1145 <50 49 <0 50 <0 50 <0 50 1 l 16 No FP,No S,Yes 0 MW-8C 8130100 901 2121 -1220 1050 685 156 678 2 18 758 <2 NA No FP,No S,Yes O 11/21/00 1919 -to 18 <50 0 692 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes 0 2/15/01 2055 -1154 <50 184 173 <50 194 <2 20 No FP,No S,O=NE 05/17/41 1995 -1094 <50 0 861 <0 5 <0 5 <0 5 <2 20 No FP,No S,Yes 0 8116/01 2141 -1240 <50 071 <0 5 <0 5 <0 5 <2 44 No FP,No S,No 0 1216101 2228 -1327 150 47 12 12 45 <0 50 1 3 No FP,No S,Yes 0 2114102 2064 -1163 <500[9] 120[9] <5 0[9] 18[9] <5 0[9] 13 18 No FP,No S,Yes 0 NA =Not analyzed NS-Not sampled NF=Not evaluated O=Odor S-Sheen FP=Free product tnsl=mean sea levet bgs=below ground surface =Analytical results m micrograms pSn- Ytter literP am le dmi ations [4]Chromatogram Pattern Gasoline C6 C 12 MW 4 34 -Well ID and sample depth(feet) [51 Chromatogram Pattern Weathered Gasoline C6 Cl2 W 24 M W3R Water sample sample depth(feet) R=Rinsate blank [61 Chromatogram Pattem Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6 C12 TPHG=Total petroleum hydrocarbons as gasoline (7]Chromatogram Pattern Unidentified Hydrocarbons C6 C 12 =Below detection limit for analytical methods used (8]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble *-Raised method reporting lima due to high analyte concentration requiring sample dilution the pattern of the requested fuel * =Raised method reporting linut due to matrix interference 19]Sauiple was re analyzed outside of USEPA recommended hold time at a dilution MTBE was analyzed using USEPA Method 8260 unless noted otherwise(see below) [10]The sample was diluted due to the presence of high levels ofnon target analytes resulting in [1]-MTBE was analyzed using USEPA Method 8020 elevated reporting limits [21=Water levels collected on 1115199 samples collected on 12/17/99 due to equipment failure [3]=Water level collected on 2125100 Arco_2l68_Qu2rterly_Data As 8 of 8 Delta