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CAMBRIA Table 1 Additional Groundwater Analytical Data,Shell-branded Service Station,2575 Country Club Boulevard,Stockton,Caltforma Sample Date Ethanol TBA DUPE ETBE TAME Methanol EDS Volatile Organics by EPA 8260 (991L) (µgQ (991L) (9911-) (J+gB-) WIL) (A91L) (J+gn-) 2456 CC 12-Apr-01 NA <200 <2 00 <2 00 <2 00 NA NA Foster Well Down,2472 Country Club Boulevard 2472 CC 22 Dec-97 <500 <100 <2 0 <2 0 <2 0 <1,000 NA 2472 CC 29-Jan 98 600 <100 <2 0 <2 0 <2 0 <1 000 NA j 2472 CC 23-Apr-98 <500 <100 <2 0 <2 0 <2 0 <1000 NA 2472 CC 29 Jul 98 600 <100 <20 <2 0 C2 0 <1000 NA 2472 CC 06-Oct-98 600 <100 <2 0 <20 <2 0 <1 000 NA 2472 CC 27-Jan-99 <500 <100 <20 <20 <20 <2 000 NA 2472 CC 15-Apr 99 <3 000 <200 <2 00 <2 00 <2 00 <1000 NA 2472 CC 27-Jul-99 <1 000 <200 <2 00 <2 00 <2 00 <1,000 NA 2472 CC 28-Oct 99 <1000 <200 <2 00 <2 00 <2 00 <1,000 NA 2472 CC 28 Jan-00 <l 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-Jn1-00 NA NA 4 00 <1 00 <1 00 NA <100 2472 CC 19 Oct-00 NA <100 <2 00 <2 00 <2 00 NA NA DIPE,TAME TBA and EI'BE 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-Ol NA <200 <2 00 <2 00 <2 00 NA NA Sanella Well Down,2468 Country Club Boulevard 2468 CC Down 05-Aug 97 600 <100 <20 <2 0 <20 <1000 NA Not detected except for Benzene 48,Chloromethane 4 8,1,1- 2468 CC Down 29-Aug-97 <500 <100 <2 0 <2 0 <2 0 1400 NA Dichloroethane 5 3 Ethylbenzene 40,Naphthalene 5 3,Styrene 3 1,Toluene 30 1 2,3-Trtmethylbenzent 4 2 and Total Xylenes 100 ppb 2468 CC Down 22 Dec-97 <500 <100 <20 <20 <2 0 <1000 NA 2468 CC Down 29-Jan-98 <500 <100 <20 <20 <20 <1000 NA 2468 CC Down 23-Apr 98 <500 <100 <20 <2 0 <20 <1000 NA 2468 CC Down 29-Jul 98 <1000 <200 <4 0 <40 <4 0 <1000 NA 2,468 CC Down 06-Oct-98 <500 <100 <2 0 <2 0 <2 0 <I000 NA 2468 CC Down 27 Jan-99 <500 <100 <2 0 <2 0 <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 <low <200 <2 00 <2 00 <2 00 <1000 NA 2468 CC Down 28-Jan-00 <1000 <200 <2 00 <2 00 <2 00 <I000 NA 2468 CC Down 18-Apr-00 <1000 400 <2 00 <2 00 <2 00 NA NA 2468 CC Down 28-Jul-00 NA NA <1 00 <100 <1 00 NA <1 00 DIPE,TAME,and EDS were analyzed outside of EPA recommended hold time DIPE TAME TBA,and ETRE were analyzed outside of EPA 2468 CC Down 19 Oct-00 NA <100 <2 00 <2 00 <l 00 NA NA recommended hold time 2468 CC Down 11 Jan-01 NA <200 <2 00 <2 00 <2 00 NA NA 0783 Page 8 of 9