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Table 1 . Groundwater Monitoring Data ARCO Service Station No 2186 3212 North California Street Stockton,California LVep Elevation of Static Water[l] Top of Elevation of Groundwater Total Sample No Date Top of Cotag Level Seteenl2l GroundwaieF Flow Dncchon TPHG Benzene Toluene Eth(benzene Xylenes MTBE[3) Obsetvatlwls VW-3 05/23/96 NM 4576 41 80 NM 290 <0 5 <05 <0 5 <0 5 <3 No FP No S VW 3 09119!96 NM 5402 NM 310 <0 5 <0 5 <0 5 <0 5 <3 No FP No S VW 3 11/27/96 NM 51 15 NM 280 <0 5 <0 5 <0 5 <0 5 Q No FP,No S VW 3 03/21/97 NM 4249 NM 180 <0 5 <0 5 <0 5 <0 5 <3 No FP No S VW 3 05722!97 NM 4428 NM 240 <0 5 <0 5 <0 5 <0 5 <3 No FP No S VW 3 08120197 NM 5021 NM 200 <0 5 <0 5 <0 5 <0 5 <5 No FP No S VW 3 11/20197 NM 4946 NM 160 46 4 4 26 67 <5 No FP No S V W 3 02/17/98 NM 4472 NNl 93 <0 5 <0 5 <0 5 <0 5 <5 No FP No S VW 3 06124/98 NM 3628 NM <50 <0 5 <0 5 <0 5 <05 <5 No FP No S V W 3 09121198 NM 3969 NM 227 4 56 <0 5 222 3 24 159 No FP No S VW-3 12/14198 NM 3790 NM 57 1 <0 5 <0 5 <D 5 1 D5 <5 No FP No S VW 3 03131!99 N61 3581 NM <50 <0 5 <0 5 <G5 <0 5 <5 No FP No S VW 3 06111199 NM 3460 NM 152 19 <0 5 699 162 186 No FP No S VW 3 09110199 NM 38 77 NM 1 210 546 <0 5 545 137 1590 No FP No S VW 3 12103/99 NM 3876 NM 804 <0 5 <0 5 <0 5 <0 5 149 No FP No S VW 3 04103/00 NM 3545 NM <5D 338 <0 5 186 562 30 No FP No S V W 3 06/22100 NM 3551 NM 1 690 848 384 227 432 3180[4] No FP No S HG-Twat pwoieumhydrocarbons os gasoline Armlytical resuhs m pa to per billion(ppb) qm=Medtyl tat butyl dha Eimatim datum Is mean sea level 11 Measured below lop of casing c=Bd—detection!unit for Ila:analyLcal rradiud urea 2)Meawred from ground surface FP-Freeproduct Measured m feel 1.31 MTBE waa mmlyzH using WEPA Metl d8029 S=Stern ,41MTIIE—.,Ipt.d%i,mg 11SEPA Method S260 =RmW MRL due to high analyte c0nenanls6n requiring smrpic ditutim NM-Not,mmawred =Rrpotiug hrml rased due to rsmlra u&erferrnca NA=Not matyud I C WRCO21WQIti1.172l Ug200z1s Delta Page 3 of 3 9149100