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T*E 1 Y' <br /> HISTORICAL GROUNDWATER MONITORING DATA <br /> Former ARCO Service Station No 2168 <br /> 441 Charter Way <br /> Stockton,California <br /> Elevation <br /> Top of Static Water Water Depth to Ethyl- Total Dissolved <br /> Well ID Casing Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen <br /> &Sample Date (feet msl) (feet bgs) (feet msl) (feet bgs) gg/L pg/L pg/L }ig/L gg/L µg/L (ppm) Observations <br /> MW-8 08/30/00 935 18 85 -950 15 0 115 <2 <2 <2 <2 <2 NA No FP,No S,Yes O <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 <0 5 <0 5 <0 5 <2 1 2 No FP,No S,O=NE <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 O <br /> 02/15/01 961 2088 -1127 811 [7] 159 298 490 492 <2 13 No FP,No S,O=NE <br /> MW-8C 08/30/00 901 2121 -1220 1050 685 156 678 2 18 758 <2 NA No FP,No S,Yes O <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 1 84 173 <50 194 <2 20 No FP,No S,O=NE <br /> NA =Not analyzed NS=Not sampled NC Not evaluated O=Odor S=Sheen FP—Free product rust=mean sea level bgs=below groi bgs=below ground surface <br /> gg/L=Analytical results in micrograms per liter <br /> Sample designations [4]Chromatogram Pattern Gasoline C6-C1 2 <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 161 Chromatogram Pattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6-C 12 <br /> PHG=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 analyle 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 /> [l]=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 /> I <br /> C URCO12168IQTRLYITABLES12I68QUARTERLY DATA XLS <br /> 8 of 8 Delta 4/25101 <br />