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Tab* • <br /> Groundwater Monitoring Data <br /> 1995 to Present <br /> Former ARCO Service Station No 2168 <br /> 441 Charter Way, Stockton, California <br /> Elevation Static Elevation Top <br /> Well 1D of Top Water of of Ethyl- Total <br /> &Sample of Casing Level Groundwater Screen TPHG Benzene Toluene benzene Xylenes MTBE <br /> Depth Date (feet mss) (feet bgs) (feet msl) (feet b s) (µ 11,) (µ IL} ( 1L (µ 1L t 1L) (gg1L Observations <br /> MW-8 08/30/00 935 18 85 -950 115 <2 <2 <2 <2 <2 No FP,No S,Yes O <br /> MW-8 11/21/00 935 1930 -995 <50 <0 5 <0 5 <0 5 <0 5 <2 No FP,No S,Yes O <br /> MW-1 B 08/30/00 1026 21 25 -1099 504 160 6 9 12 262 <2 No FP,No S,Yes O <br /> MW-IB 11/21/00 1026 2136 -11 10 1,500[4] 506 165 25 5 553 <2 No FP,No S,Yes O <br /> MW-1C 08/30/00 1021 2219 -1198 53 7 6 3 <2 <2 406 <2 No FP,No S,Yes O <br /> MW-1C 11/21/00 1021 2169 -1148 62 3 [4] 569 121 0 999 351 <2 No FP,No S,Yes 0 <br /> MW-8B 08/30/00 961 2027 -1066 1,130 425 496 106 108 <2 No FP,No S,Yes 0 <br /> MW-8B 11/21/00 961 2088 -l 1 27 924[41 241 23 4 525 109 <2 No FP,No S,Yes O <br /> MW-8C 08/30/00 901 21 21 -1220 685 15 6 6 78 2 18 758 <2 No FP,No S,Yes O <br /> MW-8C 11/21/00 901 19 19 -10 18 <50 0 692 <0 5 <0 5 <0 5 <2 No FP,No S,Yes O <br /> NA =Not analyzed NS=Not sampled NL.=Not evaluated O=Odor S=Sheen FP=Free product msl=mean sea level bgs=below ground surface <br /> µg1L=Analytical results in micrograms per bier <br /> Sample designations [41 Chromatogram Pattern Gasoline C6-C 12 <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=Rmsate blank [6]Chromatogram Pattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6-C12 <br /> PHO=Total petroleum hydrocarbons as gasoline <br /> <=Below detection limn for analytical methods used <br /> `=Raised method reporting limit due to high analyse concentration requiring sample dilution <br /> #•=Raised method reporting limit due to matrix interference <br /> MTBE was analyzed using USEPA Method 9260,unless noted otherwise(see below) <br /> [11=MTBE was analyzed using USEPA Method 8020 <br /> [2)=Water levels collected on 1115/99 samples collected on 12/17/99 due to equipment failure <br /> [31=Water level collected on 2125100 <br /> 1 <br /> C kMyDocuments\ARC0121681Q I RLY1200012168g400 xls Delta <br /> 8 of 8 2/19101 <br />