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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 tert-Butyl DISSOLVED ELEVATION TOP or 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-8 9.71 12/09/aa 9.71 04/12/89 50.28 0 -40.57 9.71 05/04/89 0 3 1300 63 46 377 9.71 05/22/09 51.08 0 -41.37 9.71 08/24/89 53.5 0 -43.79 27 4300 500 <300 650 9.71 10/10/89 53.2 0 -43.49 9.71 11/02/69 54.62 0 -44.91 9.71 11/30/89 54.46 0 -44.75 9.71 01/12/90 53.34 0 -43.63 1.3 12000 4000 200 2000 9.71 02/19/90 53.24 0 -43.53 9.71 02/26/90 53.31 0 -43.6 9.71 05/25/90 53.29 0 -43.58 3 3200 240 <30 250 9.71 11/27/90 $4.42 0 -44.71 6 11000 2200 150 730 9.71 03/29/91 55.1 0 -45.39 6 7100 2400 190 830 9.71 04/08/91 NM 0 9.71 06/27/91 55.22 0 -45.51 5 5700 570 180 520 9.71 o9/18/91 55.41 0 -45.7 2 6500 1100 160 760 9.71 12/17/91 54.62 0 1 -44.91 24 7500 4500 220 2100 9.71 01/21/92 53.94 0 -44.23 9.71 02/04/92 53.74 0 -44.03 9.71 03/10/92 53.52 0 -43.81 7.6 3200 970 <15 370 9.71 04/29/92 53.76 0 -44.05 9.71 06/18/92 54.54 0 -44.83 15 3700 2500 250 530 9.71 07/16/92 54.9 0 -45.19 9.71 08/14/92 55.32 0 -45.61 9.71 09/22/92 55.88 0 -46.17 0.77 280 8.5 <3 34 9.71 09/25/92 55.85 0 0.003 -46.14 CERT. SV 11.74 10/06/92 56.02 0 0.007 -44.28 11.74 11/11/92 55.6 0 0.000 -43.86 11.74 12/09/92 55.2 0 0.008 1 -43.46 11 3000 1600 <15 370 11.74 oi/15/93 54.62 0 0.000 -42.88 11.74 02/08/93 54.5 0 0.100 -42.86 11.74 03/11/93 53.52 0 0.017 -41.80 2.3 420 140 18 230 11.74 04/15/93 52.7 0 0.008 -40.97 11.74 05/18/93 51.68 0 0.017 -39.95 11.74 06/14/93 51.86 0 0.017 -40.14 3.9 700 51 65 310 11.74 07/19/93 51.48 0 0.008 -39.75 11.74 06/20/93 52.14 0 0.025 -40.43 11.74 oe/23/93 52.16 0 0.013 -40.43