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CAMBRIA Table 1 Additional Groundwater Analytical Data,Shell-branded Service Station,2575 Country Club Boulevard,Stockton,California Sample Date Ethanol TBA DIPE ETBE TAME Methanol EDB Volatile Organics by EPA 8260 (Jrgn-) (Ag/L) (118/1-) (Ag/L) (A81L) (AgfL) (ug/L) (ug/L) 2472 CC 22 Dec 97 <500 <100 <2 0 <2 0 <2 0 <1000 NA 2472 CC 29-Jan-98 <500 <100 <2 0 <2 0 <2 0 <1000 NA 2472 CC 23-Apr-98 <500 <100 <2 0 <20 <2 0 <1000 NA 2472 CC 29 Jul 98 <500 <100 <2 0 <20 <2 0 <1000 NA 2472 CC 06-Oct 98 <500 <100 <20 <20 <2 0 <1000 NA 2472 CC 27 Jan-99 <500 <100 <20 <20 <20 <2000 NA 2472 CC 15 Apr-99 <3000 <200 <2 00 <2 00 <2 00 <1000 NA 2472 CC 27 Jul-99 <1000 <200 <2 00 <2 00 <2 00 <1000 NA 2472 CC 28 Oct-99 <1000 <200 <200 <200 <200 <1000 NA 2472 CC 28-Jan-00 <1000 <200 <2 00 <2 00 <2 00 <I000 NA 2472 CC 18-Apr-00 <1000 <100 <2 00 <2 00 <2 00 NA NA 2472 CC 28-Jul-00 NA NA <1 00 <1 00 <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,2468 Country Club Boulevard 2468 CC Down 05 Aug 97 <500 <100 <20 <20 <20 <1000 NA Not detected except for Benzene 48 Chloromethane 4 8 1 1 2468 CC Down 29-Aug-97 <500 <100 <20 <20 <2 0 1400 NA Dichloroethane 5 3 Ethylbenzene 40 Naphthalene 5 3 Styrene 3 l Toluene 30 12 3-Trimethylbenzene 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 <2 0 <low NA 2468 CC Down 23-Apr 98 <500 <100 <20 <2 0 <2 0 <1000 NA 2468 CC Down 29 Jul 98 <1000 <200 <4 0 <40 <4 0 <1000 NA 2468 CC Down 06-Oct-98 <500 <100 <20 <20 <2 0 <1000 NA 2468 CC Down 27 Jan 99 <500 <100 <20 <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 <1 00 <1 00 <1 00 NA <1 00 DIPE TAME and EDB were analyzed outside of EPA recommended hold time 2468 CC Down 19 Oct-00 NA <100 <2 00 <2 00 <2 00 NA NA DIPS,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 2468 CC Down 12 Apr 01 NA <200 <2 00 <2 00 <2 00 NA NA Sanella Well Pori,2468 Country Club Boulevard 0783 Page 8 of 9