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• ! i CAMBRIA _ Table 1 Additional Groundwater Analytical Data,Shell-branded Service Station,2575 Country Club Boulevard,Stockton,California Sample Date Ethanol TBA DIPS ETBE TAME Methanol EDB Volatile Organics by EPA 8260 WIL) (l+YI-) (ugIL) (ugA-) (Rgn-) (AgIL) (,Ug/-) WIL) 2456 CC 12-Apr Ol NA <200 <2 00 <2 00 <2 00 NA NA Foster WeR Down,2472 Country Club Boulevard 2472 CC 22 Dec-97 <500 <100 <20 <2 0 <2 0 <l 000 NA 2472 CC 29 Jan 98 <500 <100 <20 <2 0 <2 0 <1 000 NA 2472 CC 23 Apr-98 <500 <100 <20 <2 0 <2 0 <1 000 NA 2472 CC 29 Jul-98 <500 <100 <2 0 <2 0 <2 0 <1,000 NA 2472 CC 06-Oct-98 <500 <100 <2 0 <2 0 <2 0 <l 000 NA 2472 CC 27-Ian-99 <500 <100 <2 0 <2 0 <2 0 <2 000 NA 2472 CC 15-Apr 99 <3,000 <200 <2 00 <2 00 <2 00 <1000 NA 2472 CC 27-Jul-99 <1000 <200 <2 00 <2 00 <2 00 <1 000 NA 2472 CC 28-Oct 99 <1,000 <200 <2 00 <2 00 <2 00 <1,000 NA 2472 CC 28-Jan-OO <1,000 <200 <2 00 <2 00 <2 00 <1 000 NA 2472 CC 18-Apr-00 <1,000 <100 <2 00 <2 00 <2 00 NA NA 2472 CC 28 Jul-00 NA NA <100 <100 <100 NA <100 2472 CC 19-Oct-00 NA <100 <2 00 <2 00 <2 00 NA NA DIPE TAME TBA and ETBE were analyzed outside of EPA recommended hold time 2472 CC 11-Jan-01 NA <200 <2 00 <2 00 <2 00 NA NA 2472 CC 12-Apr-01 NA <200 <2 00 <2 00 <2 00 NA NA Sanella Well Down,1468 Country Club Boulevard 2468 CC Down 05-Aug-97 <500 <100 <20 <20 <20 <1 000 NA Not detected except for Benzene 48 Chloromethane 4 8 1 1- 2468 CC Down 29 Aug-97 <500 <100 <20 <2 0 <2 0 1400 NA Dichloroethane 5 3 Ethylbenzene 40 'Naphthalene 5 3,Styrene 3 1,Toluene 30,1 2,3-Tnmethylbenzene 4 2,and Total Xylenes 100 ppb 2468 CC Down 22 Dec-97 <500 <100 <2 0 <2 0 <20 <1000 NA 2468 CC Down 29 Jan 98 <500 <100 <2 0 <2 0 <20 <1000 NA 2468 CC Down 23-Apr 98 <500 <100 <2 0 <2 0 <2 0 <1000 NA 2468 CC Down 29 Jul-98 <1000 <200 <4 0 <4 0 <4 0 <1000 NA 2468 CC Down 06-Oct-98 <500 <100 <2 0 <2 0 <2 0 <1000 NA 2468 CC Down 27-Jan 99 <500 <100 <2 0 <20 <2 0 <2000 NA 2468 CC Down 15-Apr-99 <3000 <200 <2 00 <2 00 <2 00 <1000 NA 2468 CC Down 27 Jul-99 <1000 <200 <2 00 <2 00 <2 00 <1000 NA 2468 CC Down 28-Oct 99 <1000 <200 <2 00 <2 00 <2 00 <1000 NA 2468 CC Down 28 Jan-00 <1000 <200 <2 00 <2 00 <2 00 <1000 NA 2468 CC Down 18 Apr 00 <1000 <100 <2 00 <2 00 <2 00 NA NA 2468 CC Down 28-Jul-00 NA NA <100 <1 00 recommended hold time 2468 CC Down 19-Oct-00 NA <100 <2 00 <2 00 <2 00 NA NA DIPE TAME,TBA and ETBE were analyzed outside of EPA recommended hold time 2468 CC Down I I-Jan-01 NA <200 <2 00 <2 00 <2 00 NA NA 0783 Page 9 of 9