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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 PPR PPB PPS PPB PPB PPB PPM MW-4 9.51 04/12/09 49.66 0 -40.15 05/04/89 0 <0.5 28 <0.5 <0.5 <0.5 9.51 05/22/89 50.38 0 -40.87 9.51 08/24/89 52.96 0 -43.45 0.8 <0.5 2.9 1 <0.5 3.6 9.51 10/10/89 52.94 0 -43.43 9.51 1 11/02/89 54.05 0 -44.54 9.51 11/30/89 53.76 0 -44.25 9.51 01/12/90 52.67 0 -43.16 <0.5 58 4.8 0.6 2 9.51 02/19/90 51.78 0 -42.27 9.51 02/26/90 52.35 0 -42.84 9.51 05/25/90 52.59 0 -43.08 2 1900 33 <30 230 9.51 11/27/90 54.06 0 -44.55 5 3100 150 <15 180 9.51 03/29/91 54.22 0 -44.71 0.6 360 91 <0.3 140 9.51 04/08/91 NM 0 9.51 06/27/91 54.58 0 -45.07 4.3 2300 240 <7.5 510 9.51 49/18/91 54.65 0 -45.14 1.5 1300 90 <3 320 9.51 12/17/91 53.93 0 -44.42 3.1 920 29 <1.5 250 9.51 01/21/92 53.3 0 -43.79 9.51 02/04/92 53.12 0 -43.61 9.51 03/10/92 52.51 0 -43 0.25 78 1.4 <0.3 2.1 9.51 04/29/92 53.21 0 -43.7 9.51 06/18/92 54 0 -44.49 <0.05 <0.3 <0.3 <0.3 <0.9 9.51 07/16/92 54.26 0 -44.75 9.51 08/14/92 54.8 0 -45.29 9.51 09/22/92 55.26 0 -45.75 <0.05 <0.3 <0.3 <0.3 <0.9 9.51 09/25/92 55.23 0 0.01 -45.72 CERT. SV 11.57 10/08/92 $5.32 0 0.01 -43.75 11.57 11/11/92 54.98 0 0.02 -43.41 11.57 12/09/92 54.64 0 0.03 -43.07 <0.05 <0.3 <0.3 <0.3 <0.9 11.57 01/15/93 53.94 0 0.00. -42.37 11.57 02/08/93 53.96 0 0.25 -42.64 1.1.57 03/11/93 52.82 0 0.01 -41.26 NS: PURGEING PVC, STUCK IN WELL. 11.57 03/15/93 52.83 0 0.01 -41.27 <0.05 <0.3 <0.3 <0.3 <0.9 11.57 04/15/93 52 0 0.03 -40.46 11.57 05/18/93 nm 0 nm 11.57 06/14/93 51.22 0 0.03 -39.68 <0.05 <0.3 <0.3 <0.3 <0.9 11.57 07/19/93 51.06 0 0.02 -39.51 11.57 08/20/93 51.5 0 0.02 -39.95 11.57 08/23/93 1 51.5 0 0.01 -39.94