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4r <br /> TA 4 <br /> GROUND WATER TESTING RESULTS <br /> Wards and Unocal Wells <br /> September 2002 <br /> concentration to pg/L <br /> Sam le lD Unit I DTW TPM-G BENLN,NEsec-BB N-BUTYL 1,2-DCA EB I IPB h1PBE NAPHT N-PB TOLUENE 1,2,4-TMB 1,3,5-Th16 XYLENES NIETIIANOITETHANOI <br /> MW-22D <br /> 09/23/02 B 35 17 150 2 0 <0 5 <0 5 0 63 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 NA NA <br /> MW-23S <br /> 09/23/02 C 34 87 170 <05__ l <05 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <05 089 <0 5 <05 1 074 NA NA <br /> MW-23D <br /> 09/23/02 D 34 68 <50 <0 5 <0 5 <0 5 <05 <05 <05 L<05_I _<0_5 <05 l 4 <0 5 <05 l 1 NA NA <br /> MW-24S <br /> 09/23/02 C 3600 4800 1100 <50 <50 <50 250 <50 <50 <100 1 <50 1 94 1 180 <50 120 NA NA— <br /> MW-24D <br /> 09/23/02 D 3641 360 35 <0 5 <0 5 <0 5 20 14 1 13 1 96 25 38 25 5 9 79 NA NA <br /> MW-25S <br /> 09/23/02 A 34 76 34D 45 <05 <0 5 14 <05 <0 5 1 077 1 10 <0 5 1 32 120 NA NA <br /> MW-25D <br /> 09/23/02 B 3491 510 <2 5 <25 <2 5 <25 <25 <2 5T <2 5 <5 <2 5 68 72 25 47 NA NA <br /> AS-26 <br /> 091231Q2 B 3499 100 <0 5 <05 <0 5 <0 5 <05 <0 5 <0 5 1 <0 5 <0 5 <D S <0 5 <0 5 064 NA NA <br /> MW-27 <br /> 09/23/02 B 3540 230 26 <05 <0 5 <0 5 13 0 76 20 7 2 1 5 28 18 4 0 47 NA NA <br /> NOTES <br /> Unit=Hydrostratmgraphte Unit in which the well is screened <br /> Only compounds which were detected are shown on this table <br /> 09/22/02 Tertiary Butyl Alcohol was detected in wells MW-3(70 pg/L),MW-4(19 pg/L),MW-14A(5 6 pg/L),MW-25S(37 pg/L),and MW-25D(38 pg/L) <br /> Chloroform was detected in well MW-1 (3 0 pg/L)and TetraLliloroethene was detected in wells MW-18(0 85 pg/L),MW-21 S(0 58 pg/L),and MW-27(2 3 pg/L) <br /> p-Isopropyholuene was detected in well MW-8D @ 45'(25 pg/kg) <br /> <-Not detected at or above concentration limit listed <br /> DTW=Depth to Water EB =Ethylbenzene N-PB =ti-Propylbenzetie NA=Not Analyzed <br /> 1,2,4-1 MB = 1,2,4-Trimethylbenzene IPB =Isopiopylbenzene NAPHT=Naphthalene ND=Not Detected <br /> 1,2-DCA=1,2-Dichloroethane MTBE=Methyl Tertiary Butyl Ether sec-BB=sec-Butylben7cne NS=Not Sampled <br /> 1,3,5-TMB= 1,3,541711riethylbMene N-BUTYL=n-Butylbenzene TPH-G=1 otal Petroleum Hydrocarbons as Gasolme <br /> 1232 ANALY M-AL DA CA Page 3 of 3 F_NVIRONMENTAL AUDIT,INC <br />