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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 Cert-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 MW11 12.81 10/01/92 57.2 0 0.00 -44.39 12.81 10/08/92 57.2 0 0.00 -44.39 <0.05 <0.3 <0.3 <0.3 <0.9 12.81 11/11/92 56.84 0 0.00 -44.03 12.81 12/09/92 56.4 0 0.00 -43.59 <0.05 <0.3 <0.3 <0.3 <0.9 12.81 01/15/93 55.78 D 1 0.00 -42.97 12.81 02/08/93 54.78 0 0.00 -41.97 12.81 03/11/93 54.65 0 0.00 -41.84 <0.05 <0.3 <0.3 <0.3 <0.9 12.81 04/15/93 53.82 0 0.00 -41.01 12.81 05/18/93 51.83 0 0.00 -39.02 12.81 06/14/93 53.08 0 0.00 -40.27 <0.05 <0.3 <0.3 <0.3 <0.9 12.81 07/19/93 51.84 0 0.00 -39.03 12.81 48/20/93 53.42 0 0.00 -40.61 12.81 08/23/93 53.42 0 0.00 -40.61 12.81 09/15/93 53.6 0 0.00 -40.79 12.81 09/29/93 53.6 0 0.00 -40.79 12.81 09/29/93 53.6 0 0.00 -40.79 <0.05 <0.3 <0.3 <0.3 <0.9 12.81 11/05/93 53.19 0 0.00 -40.38 12.81 12/12/93 52.53 D 0.00 -39.72 CA 12.81 02/10/94 52.48 0 0.00 -39.67 <0.05 <0.5 <0.5 <0.5 <0.5 12.81 03/04/94 50.96 0 0.00 -38.15 8010 - all compounds below detection limits 12.81 03/29/94 50.4 0 0.00 -37.59 <0.05 <0.5 <0.5 <0.5 <2 12.81 04/26/94 49.84 0 0.00 -37.03 12.81 05/19/94 50.1 0 0.00 -37.29 12.81 06/22/94 49.48 0 0.00 -36.67 <0.05 <0.5 c0.5 <0.5 <2 12.81 08/17/94 51.64 0 0.00 -38.83 12.81 09/14/94 50.5 0 0.00 -37.69 <0.05 <0.5 <0.5 <0.5 <2 12.81 10/26/94 50.7 0 0.00 -37.89 12.81 12/16/94 50.25 0 0.00 -37.44 <0.05 <0.5 <0.5 <0.5 <2 12.81 01/25/95 49.64 0 0.00 -36.83 12.81 03/15/95 48.73 0 0.00 -35.92 <0.05 <0.5 <0.5 <0.5 <2 12.81 04/12/95 48.97 0 0.00 -36.16 12.81 05/17/95 47.58 0 0.00 -34.77 12.81 06/21/95 47.26 0 0.00 -34.45 <0.05 <0.5 <0.5 <0.5 <2 12.81 08/01/95 47.36 0 0.00 -34.55 12.81 09/26/95 47.65 0 0.002 -34.84 12.81 10/17/95 47.37 0 0.00 -34.56 12.81 11/14/95 47.05 0 0.00 -34.24 12.81 12/12/95 46.55 0 0.00 -33.74 12.81 01/22/96 45.62 0 0.00 -32.81