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• 0 CAMBRIA Table 1 Additional Groundwater Analytical Data,Shell-branded Service Station,2575 Country Club Boulevard,Stockton,California Sample Date Ethanol T13A DIPE ETBE TAME Methanol EDB Volatile Organics by EPA 8260 (ug/L) (ASIL) (tLgtL) (RSn-) (99/ ) (µlin-) (A91L) WIL) Sanella Well Por41468 Country Club Boulevard 2468 CC Port 05 Aug-97 <500 <100 <2 0 <20 <2 0 4,000 NA 2468 CC Port 29 Aug 97 <500 <100 <2 0 <20 <20 <1 000 NA Not detected except Total Xylenes 3 3 ppb 2468 CC Port 02 Dec-97 <500 <100 <2 0 <20 <20 <1 000 NA 2468 CC Port 22-Dec-97 <500 <100 <20 <20 <20 <1 000 NA 2468 CC Port 29-Jan-98 <500 <100 <20 <20 <20 <1,000 NA 2468 CC Port 23 Apr 98 <500 <100 <20 <20 <20 <1,000 NA 2468 CC Port 29 Jul-98 <500 <100 <2 0 <2 0 <20 <1000 NA 2468 CC Port O6-Oct-98 <500 <100 <2 0 <2 0 <20 <1,000 NA 2468 CC Port 27-Jan-99 <500 <100 <20 <2 0 <2 0 <2 000 NA 2468 CC Port 15-Apr-99 <3 000 <200 <2 00 <2 00 <2 00 <1,000 NA 7,468 CC Port 27-Jul-99 <1,000 <200 <2 00 <2 00 <2 00 <1,000 NA 2468 CC Port 28-Oct 99 <1 000 <200 <2 00 <2 00 Q 00 <1,000 NA 2468 CC Port 28-Jan-00 <1 000 <200 <2 00 <2 00 <2 00 <1 000 NA 2468 CC Port 18-Apr 00 <1 000 <100 <2 00 <2 00 <L 00 NA NA 2468 CC Port 28-Jul-OO NA NA <1 00 <1 00 <1 00 NA <1 00 2468 CC Port 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 Port 11-Jan-01 NA <200 <2 00 <2 00 <2 00 NA NA 2468 CC Port 12-Apr-0l NA <200 <2 00 <2 00 <2 00 NA NA Abbreviations and Notes NA=Not analyzed or not available <x=Not detected at detection lumt x (D11P)=Duplicate sample Ethanol,tertiary butyl alcohol(TBA),Di-Isopropyl ether(DIPE) Ethyl tertiary butyl ether(ETRE),tertiary amyl methyl ether(TAME),and Ethylene dibornude(Ella)analyzed by EPA Method 8260 Methanol analyzed by EPA Method 8015 Modified I 0783 Page 9 of 9