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TABLE 1 GROUNDWATER MONITORING AND CHEMICAL RESULTS: FORMER REGAL STATION 603, 6425 PACIFIC AVENEUE, STOCKTON, CALIFORNIA WELL # CASING DATE DEPTH TO PROD. VACUUM CORRECTED TOTAL PET. BENZENE TOLUENE ETHYL XYLENES Methyl tent-Butyl DISSOLVED ELEVATION TOP OF THICK. AT WELL GW ELEV. HYDROCARB BENZENE Ether OXYGEN FEET AMSL WATER HEAD FT. AMSL GAS-RANGE 8020 8260 IN FEET IN FEET IN FEET PPM PPB Ppb PPB PPB ppB PPB PPM MW-5 9.77 04/12/69 50.36 0 -4o.59 05/04/89 0 <0.5 <0.5 <0.5 <0.5 <0.5 9.77 05/22/89 9.77 08/24/89 53.8 0 -44.03 <0.050 <0.5 1.2 <0.5 0.6 9.77 10/10/99 53.4 0 -43.63 I 9.77 11/02/89 55.01 0 -45.24 9.77 11/30/89 54.64 0 -44.87 9.77 01/12/90 53.48 0 -43.71 <0.5 2 1 <0.3 2 9.77 02/19/90 53.41 0 -43.64 9.77 02/26/90 53.54 0 -43.77 9.77 05/25/90 53.4 0 -43.63 <0.05 0.4 0.3 <0.3 <0.9 9.77 11/27/90 54.9 0 -45.13 <0.05 <0.3 <0.3 <0.3 <0.9 9.77 03/29/91 55.1 0 -45.33 <0.05 <0.3 <0.3 <0.3 <0.9 9.77 84/09/91 NM 0 9.77 06/27/91 55.46 0 -45.69 <0.05 <0.3 <0.3 <0.3 <0.9 9.77 09/19/91 55.4 0 -45.63 <0.05 <0.3 <0.3 <0.3 <0.9 9.77 12/17/91 54.71 0 -44.94 <0.05 <0.3 <0.3 <0.3 <0.9 9.77 01/21/92 54.08 0 -44.31 9.77 02/04/92 54.9 0 -45.13 }� 9.77 03/10/92 53.66 0 -43.89 <0.05 <0.3 <0.3 <0.3 <0.9 9.77 04/29/92 54.04 0 -44.27 N11.84 06/18/92 54.9 0 -45.13 <0.05 <0.3 <0.3 <0.3 <0,9 07/16/92 55.2 0 -45.43 09/14/92 55.7 0 -45.93 09/22/92 56.18 0 -46.41 <0.05 <0.3 <0.3 <0.3 <0.9 09/25/92 56.16 0 -46.39 CERT. SV4 10/0e/92 56.24 0 0 -44.4 4 11/11/92 55.86 0 0 -44.02 4 12/09/92 56.44 0 trace -44.6 <0.05 <0.3 <0.3 <0.3 <0.9 4 01/15/93 54.66 0 0 -42.82 02/08/93 54.64 0 0 -42.8 03/11/93 53.64 0 trace -41.8 <0.05 <0.3 <0.3 <0.3 <0.9 04/15/93 52.82 0 0.004 -40.98 05/18/93 51.73 0 0.000 -39.89 4 06/14/93 52.1 0 0.000 -40.26 <0.05 <0.3 <0.3 <0.3 <0.9 . 4 07/19/93 54.72 0 0.000 -42.88 P .84 o9/20/93 52.5 0 Tr -40.66 .84 99/23/93 52.52 0 Tr -40.68 .84 09/15/93 52.7 0 0.000 -40.86