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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 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 10 32 12/09/92 53 04 0 0 01 -42 72 10 32 01/15/93 52 74 0 0 00 -42 42 10 32 02/08/93 52 84 0 TRACE -42 52 10 32 03/11/93 51 38 0 0 01 -41 06 <0 05 <0 3 <0 3 <0 3 <0 9 10 32 1 04/15/93 50 6 0 0 01 -40 28 10 32 05/18/93 50 06 0 0 00 -39 74 10 32 06/14/93 49 7 0 0 002 -39 38 <0 05 <0 3 <0 3 <0 3 <0 9 10 32 07/19/93 49 96 0 0 00 -39 64 10 32 08/20/93 49 9 0 0 03 -39 S8 10 32 08/23/93 49 98 0 0 002 -39 66 10 32 09/15/93 50 22 0 0 000 -39 90 10 32 09/29/93 50 16 0 0 000 -39 84 i 10 32 09/29/93 50 14 0 0 008 -39 82 <0 05 <0 3 <0 3 <0 3 <0 9 f 10 32 11/05/93 49 8 0 0 000 -39 48 10 32 12/22/93 49 2 0 0 000 -38 88 <0 05 <0 5 c0 5 c0 5 <0 5 Ca 10 32 02/10/94 49 9 0 Tr -39 58 10 32 03/04/94 47 7 0 0 025 -37 41 8010 = all compounds below detection limits 10 32 03/29/94 47 04 0 0 007 -36 73 <0 05 <0 5 <0 5 <0 5 <2 10 32 04/26/94 46 58 0 0 010 -36 27 10 32 05/19/94 46 88 0 0 013 -36 57 10 32 06/22/94 46 13 0 0 007 -35 82 <0 05 <0 5 <0 5 <0 5 <2 10 32 08/17/94 48 33 0 0 013 -38 02 10 32 09/14/94 47 05 0 0 000 -36 73 0 08 <0 5 <0 5 <0 5 <2 i 10 32 10/26/94 47 25 0 0 000 -36 93 10 32 12/16/94 46 86 0 0 000 -36 54 <0 05 <0 5 <0 5 <0 5 <2 10 32 01/25/95 46 25 0 0 000 -35 93 10 32 03/16/95 1 45 36 0 0 010 -35 05 <0 05 <0 5 <0 5 <0 5 <2 10 32 04/12/95 45 87 0 0 003 -35 55 10 32 05/17/95 44 15 0 0 000 -33 83 10 32 06/21/95 43 84 0 0 000 -33 52 <0 05 <0 5 <0 5 <0 5 <2 i 0 0 000 10 32 to/01/95 44 02 -33 70 10 32 09/26/95 41 7 0 0 003 -31 38 10 32 ]n/17/9s 43 93 0 0 001 -33 61 � i i 1