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• ! f i TABLE I GROUNDWATER MONITORING AND CHEMICAL RESULTS: FORMER REGAL STATION 603, 6425 PACIFIC AVENEUE, STOCKTON, CALIFORNIA WELL # CASING TOP OF DATE DEPTH TO PROD. VACUUM CORRECTED TOTAL PET. BENZENE TOLUENE ETHYL XYLENES Methyl Cert-Butyl DISSOLVED ELEVATION SLOT TOP OF THICK. AT WELL GW ELEV. HYDROCARB BENZENE Ether OXYGEN FEET AMSL FEET AMSL WATER HEAD FT. AMSL GAS-RANGE 8020 8260 IN FEET IN FEET IN FEET PPB PPB PPB PPB PPB PPB PPB PPM MW-4 11.57 -23.43 04/12/89 49.66 0 -38.09 MW-4 11.57 05/04/89 0 <500 28 <0.5 <0.5 <0.5 MW-4 11.57 -23.43 05/22/89 50.38 0 -38.81 MW-4 11.57 -23.43 00/24/89 52.96 0 -41.39 800 <0.5 2.9 <0.5 3.6 MW-4 11.57 -23.43 10/10/89 52.94 0 -41.37 MW-4 11.57 -23.43 11/02/69 54.05 0 -42.48 MW-4 11.57 -23.43 11/30/89 53.76 0 -42.19 MW-4 11.57 -23.43 01/12/90 52.67 0 -41.10 <500 58 4.8 0.6 2 MW-4 11.57 -23.43 02/19/90 51.78 0 -40.21 MW-4 11.57 -23.43 02/26/90 52.35 0 -40.78 MW-4 11.57 -23.43 05/25/90 52.59 0 -41.02 2000 1900 33 <30 230 MW-4 11.57 -23.43 11/27/90 54.06 0 -42.49 5000 3100 150 <15 180 MW-4 11.57 -23.43 0-1/29/91 54.22 0 -42.65 600 360 91 <0.3 140 MW-4 11.57 -23.43 04/00/at NM 0 MW-4 11.57 -23.43 06/27/91 54.58 0 -43.01 4300 2300 240 <7.5 510 !� MW-4 11.57 -23.43 09/10/91 54.65 0 -43.08 1500 1300 90 <3 320 MW-4 11.57 -23.43 12/17/91 53.93 0 -42.36 3100 920 29 <1.5 250 MW-4 11.57 -23.43 01/21/92 53.3 0 -41.73 MW-4 11.57 -23.43 02/04/92 53.12 0 -41.55 MW-4 11.57 -23.43 03/10/92 52.51 0 -40.94 250 78 1.4 <O.3 2.1 MW-4 11.57 -23.43 04/29/92 53.21 0 -41.64 MW-4 11.57 -23.43 0(1/10/92 54 0 -42.43 <50 <0.3 <0.3 <0.3 <0.9 MW-4 11.57 -23.43 07/16/92 54.26 0 -42.69 MW-4 11.57 -23.43 00/14/)2 54.8 0 -43.23 MW-4 11.57 -23.43 09/22/92 55.26 0 -43.69 <50 <0.3 <0.3 <0.3 <0.9 MW-4 11.57 -23.43 09/25/92 55.23 0 0.01 -43.67 MW-4 11.57 -23.43 30/08/92 55.32 0 0.01 -43.76 MW-4 11.57 -23.43 11/11/92 54.98 0 0.02 -43.43 MW-4 11.57 -23.43 12/09/92 54.64 0 0.03 -43.10 <50 <0.3 <0.3 <0.3 <0.9 MW-4 11.57 -23.43 01/15/93 53.94 0 0.00 -42.37 MW-4 11.57 -23.43 02/00/93 53.96 0 0.25 -42.64 MW-4 11.57 -23.43 03/11/93 52.82 0 0.01 -41.26 NS: PURGEING PVC, STUCK IN WELL, MW-4 11.57 -23.43 03/15/03 52.B3 0 0.01 -41.27 <50 <0.3 <0.3 <0.3 <0.9 MW-4 11.57 -23.43 04/15/93 52 0 0.03 -40.46 MW-4 11.57 -23.43 05/10/93 nm 0 nm MW-4 11.57 -23.43 06/14/9-1 51.22 0 0.03 -39.68 <50 <0.3 <0.3 <0.3 <0.9 MW-4 11.57 -23.43 07/19/93 51.06 0 0.02 -39.51 MW-4 11.57 -23.43 08/20/93 51.5 0 0.02 -39.95 MW-4 11.57 -23.43 00/23/93 51.5 0 0.01 -39.94 MW-4 11.57 -23.43 09/15/93 51.66 0 0.00 -40.09 MW-4 1I.57 -23.43 09/29/93 51.68 0 0.00 -40.11