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CAMBRIA Table 1 Additional Groundwater Analytical Data,Shell-branded Service Station,2575 Country Club Boulevard,Stockton,Calitornta Sample Date Ethanol TBA DIPS ETBE TAME Methanol EDB Volatile Organics by EPA 9260 (pP/L) (pg/L) (1<gfL) (Ag/L) (µg/L) 61R/L) (m(L) (ItgfL) MW 6 15-Apr-99 <3000 <200 <200 <200 <200 <1000 NA MW-6 27 Jul-99 <1000 <200 <2 00 <2 00 <2 00 <1000 NA MW-6 28-Oct-99 <1000 <200 <2 00 <2 00 <2 00 <1000 NA MW 7 02 Sep-97 <500 <100 <2 0 <2 0 <2 0 <1000 NA Not detected MW 7 02 Dec-97 <500 <100 <2 0 <2 0 <2 0 <1000 NA MW 7 29 Jan 98 <500 <100 <2 0 <2 0 <2 0 <1000 NA MW 7 23-Apr 98 <500 <100 <2 0 <2 0 <2 0 <1000 NA MW-7 29-Jul 98 <500 <100 <2 0 <2 0 <2 0 <1000 NA MW 7 06 Oct 98 <500 <100 <2 0 <2 0 <2 0 <1000 NA MW 7 27 Jan 99 NA NA NA NA NA <2000 NA MW-7 15-Apr-99 <3000 <200 <2 00 <2 00 <2 00 <1000 NA MW-7 27-Jul 99 NA NA NA NA NA <1000 NA MW-7 27-Jul-99 NA NA NA NA NA <1000 NA MW 7 28 Oct 99 NA NA NA NA NA <1000 NA MW 8 02-Sep-97 <25000 <5000 <100 <100 <100 <10000 NA Not detected except for n Butylbenzene 360 sec Butylbenzene 100 Ethylbenzene 2100 Isoproplybenzene 210 Naphthalene 280 n Propylbenzene 790 Toluene 720 12 4-Tnmethylbenzene 5100 13 5-Tumethylbenzenc 1500 and Total Xylenes 9400 ppb MW-8 02 Dec 97 <31000 <6200 <120 <120 <120 <10000 NA MW 8 29 Jan-98 <170000 <33000 <670 <670 <670 19000 NA MW 8 23-Apr-98 <25000 <5000 <100 <100 1100 53000 NA MW-8 29-Jul 98 <16600 <3330 <67 <67 <67 14000 NA MW-8 06 Oct 98 <25000 <5000 <100 <100 <100 18000 NA MW 8 27-Jan 99 <1000 <200 <4 0 <4 0 <4 0 <4000 NA MW 8 15 Apr 99 <300000 <20000 <200 <200 214 7100 NA MW 8 27 Jul-99 <50000 <10000 <100 <100 154 138000 NA MW-8 28 Oct 99 <2500 <500 <5 00 <5 00 <5 00 17600 NA MW 8 01-Jan 00 <66700 <13300 <133 <133 <133 28900 NA MW 8 18 Apr 00 <20000 2620 <40 0 <40 0 471 <5000 NA 0783 Page 3 of l I