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• i � 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 ELEVATION TOP OF THICK AT WELL GW ELEV HYDROCARB BENZENE Ether FEET AMSL WATER HEAD FT AMSL GAS-RANGE 8020 8260 IN FEET IN FEET IN FEET PPM PPB PPB PPB PPB PPB PPB 9 88 09/18/91 54 91 0 -45 03 0 69 1500 220 <3 310 9 88 12/17/91 54 35 0 -44 47 0 24 110 14 <0 3 17 9 88 01/21/92 53 74 0 0 002 -43 86 9 88 02/04/92 53 52 0 0 -43 64 9 88 03/10/92 53 3 0 0 -43 42 <0 05 1 3 <0 3 1 <0 3 <0 9 9 88 04/29/92 53 64 0 0 -43 76 9 88 06/18/92 54 45 0 0 -44 57 <0 05 <0 3 <0 3 <0 3 <0 9 9 88 07/16/92 54 66 0 0 -44 78 9 88 08/14/92 55 16 0 0 -45 28 9 88 09/22/92 55 16 0 0 -45 28 <0 05 <0 3 <0 3 <0 3 <0 9 9 B8 09/25/92 1 55 68 0 0 007 -45 81 CERT SVY 12 01 10/08/92 55 8 0 0 02 -43 81 12 01 11/11/92 55 38 0 0 01 -43 38 12 01 12/09/92 55 04 0 0 01 -43 04 <0 05 <0 3 <0 3 <0 3 <0 9 12 01 01/15/93 54 42 0 0 00 -42 41 12 01 02/08/93 54 46 0 0 20 -42 65 ND 12 01 03/11/93 53 32 0 0 03 -41 34 <0 05 <0 3 <0 3 <0 3 <0 9 12 01 04/15/93 52 5 0 0 01 -40 50 12 01 05/18/93 51 52 0 0 02 -39 53 12 01 06/14/93 51 66 0 0 02 -39 67 <0 05 <0 3 1 <0 3 <0 3 <0 9 12 01 07/19/93 51 53 0 0 02 -39 54 12 01 08/20/93 51 82 0 0 02 -39 83 12 01 08/23/93 51 92 0 0 01 -39 92 12 01 09/15/93 52 0 0 00 -39 99 12 01 09/29/93 52 12 0 0 00 -40 11 12 01 09/29/93 52 1 0 0 01 -40 10 <0 05 <0 3 <0 3 <0 3 <0 9 12 01 11/05/93 CAR 0 0 00 12 01 12/22/93 51 04 0 0 00 -39 03 <0 05 <0 5 <0 5 <0 5 <0 5 12 01 02/10/94 CAR 0 0 00 12 01 93/04/94 49 53 0 0 02 -37 54 8010 = all compounds below detection limits 12 01 03/29/94 49 04 O 0 007 -37 04 <0 O5 <0 5 <0 5 <0 5 <2 12 01 04/26/94 48 45 1] 0 007 -36 45 12 01 05/19/94 48 67 0 0 007 -36 67