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TABLE 1 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 tort-Butyl DISSOLVED ELEVATION SLOT TOP OF THICK AT WELL GW ELEV HYDROCARB BENZENE Ether OXYGEN FEET AMSL FRUT AMSL WATER HEAD FT AMST, GAS-RANGE 8020 8260 IN FEET IN FEET IN FEET PPB PPB PPB PPB PPB PPB PPB PPM MW-2 12 61 -21 39 12/22/93 1 52 93 0 0 00 -40 32 15000 710 3100 150 2400 MW-2 12 61 -21 39 02/10/94 5D 66 0 1 98 -40 03 MW-2 1 12 61 -21 39 03/04/94 50 26 0 2 12 -39 77 MW-2 12 61 -21 39 03/29/94 42 1 0 3 61 -33 10 5800 110 550 260 2000 MW-2 12 61 -21 39 04/26/9+ 49 18 0 3 19 -39 76 MW-2 12 61 -21 39 05/19/94 49 41 1 0 3 19 -39 99 MW-2 12 61 -21 39 06/22/94 48 71 0 1 OB -37 18 31000 1600 8200 600 9200 MW-2 12 61 -21 39 00/17/94 52 16 0 2 44 -41 99 MW-2 12 61 -21 39 09/14/94 49 67 0 0 00 -37 06 25000 740 7100 230 6000 MW-2 12 61 -21 39 10/26/94 49 96 0 0 00 -37 35 MW-2 12 61 -21 39 12/16/94 49 62 0 0 00 -37 01 26000 1400 5800 240 6300 MW-2 12 61 -21 39 01/25/95 49 01 0 D DO -36 40 MW-2 12 61 -21 39 03/15/95 48 SS 0 0 00 -35 94 8300 370 1300 220 2700 MW-2 12 61 -21 39 04/12/95 47 68 0 D DD -35 07 MW-2 12 61 -21 39 05/17/95 45 28 0 6 00 -38 67 MW-2 12 61 -21 39 06/21/9s 45 55 0 0 00 -32 94 16000 480 1800 850 4000 Aw MW-2 12 61 -21 39 00/01/95 46 77 0 0 00 -34 16 lv MW-2 12 61 -21 39 09/26/95 42 17 0 2 81 -32 37 35600 1500 7500 880 1 9600 �L'A MW-2 12 61 -21 39 io/17/95 44 75 0 2 44 -34 5B MW-2 12 61 -21 39 11/14/95 43 85 0 3 84 -35 08 MW-2 12 61 -21 39 12/12/95 44 67 0 0 OG -32 06 3900 220 41 140 970 MW-2 12 61 -2.139 01/22/96 41 1 0 4 03 -32 52 MWIL2 12 61 -21 39 1 03/06/96 42 SS 0 0 00 -29 94 1600 190 19 100 75 MW-2 12 61 -21 39 o4/09/46 39 3 0 2 81 -29 50 MW-2 12 61 -21 39 05/20/96 37 5 0 4 03 -28 92 MW-2 12 61 -21 39 06/20/96 37 9 0 4 78 -30 07 11000 490 1900 400 2700 5500 2 7 Mol-2 12 61 -21 39 07/30/96 39 48 0 3 7S -30 62 MW-2 12 61 -21 39 09/19/96 39 86 0 2 81 -30 06 11000 220 1800 480 3400 <5L MW-2 12 61 -21 39 12/10/96 38 62 0 1 87 -27 88 34000 1000 6700 1500 13000 <300 MW-2 12 61 -21 39 03/18/97 36 3 0 1 87 -25 56 16000 390 3400 660 4500 <100 MW-2 12 61 -21 39 06/11/97 34 62 0 3 00 -25 01 9200 70 1700 160 2400 <300 MW-2 12 61 -21 39 09/21/97 37 42 0 0 37 -25 18 7000 120 1400 330 2400 <30 MW-2 12/0x/97 sparging and vapor extraction system operating 9 1 Moi-2 lz 61 -21 39 12/16/97 37 z D o Do -24 59 M17 `�;s.�. a;J'k5400 ¢�0 x'00 <Soo 0 MW-2 12 61 -21 39 03/11/90 34 66 0 1 03 -23 OB 18000 210 5200 610 5800 X100 MW-2 12 61 -21 39 05/28/99 32 68 0 0 GO -20 07 17000 140 4400 1 600 6100 <300 I MW-2 12 61 -21 39 09/00/90 33 58 D 0 00 -20 97 260 2 51 1 <0 5 78 <0 5 fNote 1 ;amp]ea abta�nedSon Zz712/9711weze crass"contamin`sted'with subaj7&rsxble� punip3`which,�showe3 �PHg3�a 2}mg'/1,;}Banzene, IT6 Sr !b ug/L; J thylyBenzene S'S w g jL,_Xylenes 39+ug/L," msPBE'"Iul? <5-ug/L