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i 0 TABLE 1 Groundwater Monitoring Data ARCO Service Station No 2186 Y 3212 North California Street Stockton, California Elevation of Static Water[!] Screen Elevation of Total Well Top ofCasmg Level Interval Groundwater Groundwater TPI1G Benzene Toluene Ethylbenzene Xylenes MTBE[3] Sample No Date Feet msE feet b s feet b s (feet msl) Flow Direction i L L 1L i1glu i L Observations VW-3B 5123196 1501 4576 4261 -30 75 F 290 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S 9119196 5402 -3901 NE 310 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S 11/27/96 51 15 36 14 SE 280 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S 3121197 4249 -2749 SC 180 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S 5122197 4428 -2927 E-NE 240 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S 00197 5021 3520 E NE 200 <0 5 <0 5 <0 5 <0 5 <5 0 No FP,No S 11/20/97 4946 -3445 E 160 46 44 26 67 <5 0 No FP,No S 2117198 4472 -2971 E-SE 93 <0 5 <0 5 <0 5 <0 5 <5 0 No F?,No S 6124198 3628 -2127 E <50 <0 5 <0 5 <0 5 <0 5 <5 0 No 1'1l,No S 9121198 39 69 2468 E NE 227 456 <0 5 222 324 15 9 No rP,No S 12/14/98 3790 2289 E NE 57 1 <0 5 <0 5 <0 5 105 <5 0 No FP,No S 3/31199 35 81 2080 N NE <50 <0 5 <0 5 <0 5 <0 5 <5 0 No FP,No S 6111199 3460 -1959 E-NF 152 19 <0 5 699 162 18 6 No FP,No S 9110199 3877 -2376 E-NE 1,210 546 <0 5 54 5 1 37 1590 No FP,No S 1213199 3876 -23 75 E 804 <0 5 <0 5 <0 5 <0 5 149 No FP,No S 413/00 35 45 -2044 NL <50 3 38 <0 5 l 96 5 62 30 No YP,No S 6/22/00 35 51 -2050 E 1,690 848 384 227 432 3,180[4] No FP,No S 9127100 4081 2580 E NE NS NS NS NS NS NS No IP No S 10/19/00 4064 -25 63 E-NE NS NS NS NS NS NS No FP,No S 12/20/00 3871 -23 70 E-NE <50 <0 5 <0 5 <0 5 <0 5 26 5[4] No FP,No S 3116101 3760 -2259 E-NE <50 <0 5 <0 5 <0 5 <0 5 9 12[4] No FP,No S 6121!01 4043 -2542 NE <1 000** 97 53 290 750 5,000[4] No FP,No S 09/13/01 [8] 46 19 -31 18 E-NE <50 <0 5 <0 5 <0 5 <0 5 90[4] No FP,No S 12/11/01 4341 -2940 NE <50 <0 50 <0 50 <0 50 <0 50 200[4] No FP,No S ms1=mean sea level TPHG=Total petroleum hydrocarbons as gasoline *=Raised MRL due to high analyte concentration requiring sample dilution bgs=below ground surface MTBE=Methyl tertiary butyl ether **=Reporting limit raised due to matrix interference [1]Measured below top of casing <=Below detection limit for the analytical method used [2]Measured from ground surface FP=Free product Measured in feet [3]MTBE was analyzed using USEPA Method 8020 S=Sheen [4]MTBE was analyzed using USEPA Method 8260 NM=Not measured [5]Chromatogram Pattern Weathered Gasoline C6-C-12 NA=Not analyzed [61 Sample analyzed outside USEPA recommended hold time NS=Not sampled [71 Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel [8]On the chain of-custody forms,samples were identified as MW-1B,MW-2B,and MW-313,respectively ARCD_2186_Quarteriy Data US 6 of 6 Delta