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f 30-0136-01 TABLE 1 Summary of Results of Ground Water Monitoring and Sampling Former Mobil Oil Bulk Plant 03-343 500 East Grantline Road, Tracy, California Concentrations in parts per billion (ppb) ssssszsaa:zxszazs:asasa azsazsszsssssxxssssasass:rrzsssssxsa:zaszssssssszazssassxzaszsaasazsxxxxxxxzsszszassaazzssrxzszssxssxssssszszzzzssaassassszrzsarzss WELL DATE OF TOP OF DEPTH GROUND TPH-G TPH-D B T E X ORGANIC FECAL LAO ID SAMPLING/ CASING TO WATER LEAD COLIFORM MONITORING ELEVATION WATER ELEVATION (MPN/1004 U sssasszssssszasszzzssssaaxssaaaraaazazszsassassssss::zzssssssrssssszassaz:aa:azasaartmzsszsszsssssssszsassrsssassaszz:asasssa::aaassxxssxrasrassssssssss AW-4 10/02/90 32.67 10.99 21.68 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 N0<0.3 ND<10 --- AEL AW-4 02/06/91 32.67 10.86 21.81 ND<50 0<200 ND<0.5 N0<0.5 ND<0.5 10<0.5 ND<500 --- AEL AW-4 05/07/91 32.67 10.54 22.13 ND<50 ND<50 ND<0.3 ND<0.3 ND4.3 11D<0.3 --- --- SAL AW-4 08/21/91 32.76 10.60 22.16 ND<30 ND<50 ND<0.30 00.30 ND<0.30 MD<0.30 --- --- SEQ AW-4 11/26/91 32.76 11.14 21.62 ND40 100 "** ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-4 02/21/92 32.76 10.69 22.07 N0<30 ND<50 ND<0.30 ND<0.30 MD<0.30 ND<0.30 -•• --- SEQ AW-4 04/07/92 33.26 11.01 22.25 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 NO<O.30 --- --- SEQ j AW-4 04/24/92 33.26 11.01 22.25 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 MD-c0.30 --- --• SEQ I AW-5 05/07/91 30.61 10.21 20.40 ND<50 ND<50 ND<O.3 ND<0.3 ND<0.3 M0<0.3 --- ND<2 SAL AW-5 08/21/91 30.61 10.07 20.54 ND40 ND<50 ND<O.30 ND<0.30 ND<0.30 NO<0.30 --- --- SEQ AW-5 11/26/91 30.61 10.69 19.92 ND<30 370 *** ND<0.30 ND<0.30 N04.30 ND<0.30 --- --- SEQ AW-5 02/21/92 30.61 10.43 20.18 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND40.30 --- --- SEQ AW-5 04/07/92 31.11 10.72 20.39 ND<30 ND<50 ND<0.30 ND<0.30 ND<O.30 ND<0.30 --- --- SEQ AW-5 04/24/92 31.11 10.71 20.40 ND<30 ND<50 ND<0.30 ND<0.30 MD<0.30 ND<O.30 --- --- SEQ AW-6 05/07/91 29.59 10.37 19.22 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 --- ND<2 SAL AW-6 08/21/91 29.59 10.25 19.34 ND<30 ND<50 ND<0.30 N9<0.30 0<0.30 MD<0.30 ... --- SEQ AW-6 11/26/91 29.59 10.88 18.71 ND<30 170 """ MD<0.30 ND<0.30 N0<0.30 MD-c0.30 --- --- SEQ AW-6 02/21/92 29.59 10.64 18.95 ND<30 ND<50 MD<0.30 NO<0.30 N0<0.30 ND<0.30 --- - SEQ AW-6 04/07/92 30.09 10.89 19.20 ND<30 ND<50 MD<0.30 N0<0.30 ND<0.30 ND<0.30 --- •-- SEQ AW-6 04/24/92 30.09 10.88 19.21 ND<30 ND<50 ND<0.30 04.30 ND<0.30 ND<0.30 --- --- SEQ AW-7 05/07/91 29.60 9.73 19.87 ND<50 ND<50 MD<0.3 ND<0.3 ND<0.3 ND<0.3 --- ND<2 SAL AW-7 08/21/91 29.60 9.63 19.97 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-7 11/26/91 29.60 10.21 19.39 ND<30 300 "** MD<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-7 02/21/92 29.60 9.97 19.63 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 N9<0.30 --- --- SEQ AW-7 04/07/92 30.10 10.22 19.88 ND<30 ND<50 ND4.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEQ AW-7 04/24/92 30.10 10.21 19.89 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- --- SEG E k 15-May-92 Page 2 of 3 j