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s Al 4Page Groundwater Monitoring Data ARCO Service Station No 2186 3212 North California Street, Stockton, California Elevation of Static Water[l] Screen Elevation of Total Well Top of Casing Level interval Groundwater Groundwater TPHg Benzene Toluene Ethylbenzene Xylenes MtBE[3) Sample No Date (feet msl) (feet bgs) (feet bgs) (feet ms]) Flaw Direction µg/L µg/L WL ug/L - µg/1, WL Observations VW-3B 8/20/1997 5021 3520 E-NE 200 <0 5 <0 5 <0 5 <0 5 c5 0 No FP,No S (Cont) 11/20/1997 4946 -3445 E 160 46 44 26 67 <5 0 No FP No S 2/17/1998 4472 -2971 E SE 93 <0 5 <0 5 <0 5 <0 5 <5 0 No FP,No S 6/24/1998 3628 -2127 E <50 <0 5 <0 5 <0 5 <0 5 <5 0 No FP No S 9/21/1998 3969 -2468 E-NE 227 456 <0 5 222 324 159 No FP,No S 12/14/1998 3790 2289 E-NE 57 1 <0 5 <0 5 <0 5 105 <5 0 No FP No S 3/31/1999 3581 -2080 N-NE <50 <0 5 <0 5 <0 5 <0 5 <5 0 No FP No S 6/11/1999 3460 -1959 E NE 152 19 <0 5 699 162 186 No FP,No S 9/10/1999 3877 -2376 E-NE 1 210 546 <0 5 545 137 1590 No FP,No S 12/3/1999 3876 2375 E 804 <0 5 <0 5 <0 5 <0 5 149 No FP,No S 4/3/2000 3545 -2044 NE <50 338 <0 5 186 562 30 No FP,No S 6/2212000 3551 -2050 E 1,690 848 384 227 432 3,180[41 No FP,No S 9/27/2000 4081 -2590 E-NE NS NS NS NS NS NS No FP,No S 10/19/2000 4064 -2563 E NE NS NS NS NS NS NS No FP,No S 12/20/2000 3871 -2370 E-NE <50 <0 5 <0 5 <0 5 <0 5 26 5[4] No FP,No S 3/16/2001 3760 -2259 E-NE <50 <0 5 <0 5 <0 5 <0 5 9 12[4] No FP No S 6/21/2001 4043 2542 NE <1,000** 97 53 290 750 5,000[4] No FP,No S 09/13/01 [8] 4619 -3118 E-NE <50 <0 5 <0 5 <0 5 <0 5 90[41 No FP,No S 12/11/2001 4341 -2840 NE <50 <0 50 <0 50 <0 50 <0 50 200[4] No FP,No S 3/14/2002 4037 -2536 E NE <50 <0 50 <0 50 <0 50 <0 50 26[4] No FP No S 6/19/2002 4271 2770 E NE 460[7] <0 50 <0 50 <0 50 <0 50 1,500[4] No FP,No S 9112t2002 4960 3459 E-NE 320 <2 5 <2 5 <25 <2 5 140 No FP,No S 12/3/2002 4660 -3159 E-NE <500 <5 0 <5 0 <5 0 <5 0 69 No FP No S 3/11/2003 4651 -3150 NE 380 <2,5 <2 5 <2.5 12.5 370 No FP,No S Notes ms].=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 Cert butyl ether **=Reporting lirrut raised due to matrix interference pg/L,=micrograms per Liter <=Below detection lirrut for the analytical method used [I]Measured below top of casing [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 [6]Sample analyzed outside USEPA recommended hold time NS=Not sampled 17]Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel [81 On the chain-of-custody forms,samples were identified as MW-IB MW-2B,and MW-3B,respectively K U5 SP ARC002186tQ=Xerly�I QTR 0352186 GWMR 1Q03