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31-0308 Table 1 Summary of Results of Ground Water Sampling Chevron Service Station # 9-4275 2905 West Benjamin Nott Drive, Stockton, California Concentrations in parts per billion (ppb) WELL DATE OF TOP OF DEPTH GROUND TPH-G TOG B T E X 1,2 1,2 1,3 1,4 F113 TCE LAS ID SAMPLING/ CASING TO WATER DCA DC8 DCB DCB MONITORING ELEVATION WATER ELEVATION sxx==aaasssaa===gaassssaa==a=aaasss======asssssa===aassssssa=====assssx=x=====assssssac=====aaassssxax====c=aassssssaac==xaassassssxx====xxaaas=ssxxc===s==asassssssa MW-4 03/22/89 2.81 16.29 -13 48 ND<500 ND<3000 ND<0.2 ND<0.2 ND<0.2 ND<0.4 ND40.2 ND<0.2 --- --- ND<1 --- CCAS MW-4 06/12/89 2.81 16 97 -14.16 ND<100 --- ND<0.2 ND<1 0 ND<0 2 ND<O 4 0 4 5.3 --- --- ND<1 --- CCAS MW-4 09/07/89 2 81 18.35 -15 54 170 --- 1.7 ND<1.0 ND<0.2 ND<0.4 0 9 5 3 --- --- ND<1 --- CCAS MW-4 12/18/89 2.81 17.80 -14 99 ND<50 --- ND<0.5 ND<O 5 ND<O 5 ND<0.5 ND<0.5 3 3 --- ... PACE MW-4 03/20/90 2 81 17 40 -14 59 85 --- 2 9 ND4.5 ND<0.5 0.9 ND<0 5 2.3 --- •-- --- --- PACE MW-4 07/03/90 2 81 18.05 -15 24 93 --- ND<O 5 ND<0.5 ND<O 5 ND<0 5 --- --- --- --- --- --- PACE MW-4 10/19/90 2.81 19.58 -16 77 73 --- 0<0 5 2.8 1.5 ND<O 5 --- --- --- PACE MW-4 01/17/91 2.81 19.19 -16 38 150 * --- ND<0.5 ND<0.5 ND<O 5 ND<0.5 --- ... ... ... --- "-- SAL MW-4 03/19/91 2 81 --- ... 100 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- ND<0 5 ND<0.5 ND<0.5 ___ SAL MW-4 07/18/91 2 81 19.05 -16 24 81 --- ND<O 5 ND<0.5 ND<0.5 ND<0.5 ND<3 ND<3 ND<3 ND<3 SAL MW-4 10/31/91 2.81 19.52 -16.71 180 * --- ND<0.5 ND<0.5 ND<O 5 ND<O 5 --- --- --- --- --- _.- SAL MW-4 01/16/92 2.81 18.82 -16.01 ND40 ... ND<O 5 *D<0 5 0 5 2.0 --- ... ... --- --- --- SAL MW-4 03/17/92 2 81 17 78 -14 97 150 --- 2.9 9.7 3 9.7 --- --- ... ... --- SAL MW-4 06/29/92 2 81 19 40 -16 59 130 --- 2.9 0.6 0.9 1.1 ... --- --- -" --- "-' SAL MW-4 12/10/92 2 81 20.03 -17.22 ND<O 5 --- ND<O 5 ND<0.5 ND<0.5 ND4.5 --- --- --- --- "-' '"' SAL I 15-Jan-93 Page 4