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<br /> Groundwater Monitoring Data Page 3 of
<br /> ARCO Service Station No. 548, 1612 Hammer Lane, Stockton, California
<br /> Well Elevation Static Top Elevation
<br /> Sample of Top Water of of Ethyl- Total
<br /> Number Date of Casing Level Screen Groundwater TPHG Benzene Toluene benzene Xylenes MTBE Observations
<br /> MW-4
<br /> W-25-MW4 10/30/91 1157 5045 4400 -3888 <50 <0 50 <0 50 <0 50 <0 50 NA No FP,No S,No 0
<br /> MW-4(63) 03/18/92 1157 47 24 -35 67 <50 <0 50 <0 50 <0 50 <0 50 NA No FP,No S,No 0
<br /> MW-4(63) 06/10/92 1157 4894 -3737 <50 <0 50 <0 50 <0 50 <0 50 NA No FP,No S,No 0
<br /> MW-4(64) 09/04/92 1157 5065 -3908 <50 <0 50 <0 50 <0 50 <0 50 NA No FP,No S,Yes 0
<br /> MW4(64) 12/04/92 1157 4973 -38 16 <50 <0 50 <0 50 <0 50 <0 50 NA No FP,No S,Yes 0
<br /> MW-4(63) 03/04/93 1157 4689 -3532 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,Yes 0
<br /> MW-4(63) 06/07/93 1157 4522 -3365 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW4(63) 09/02/93 1.157 46 96 -35 39 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-4(63) 12/16/93 1157 44 88 -33 31 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW4(41) 04/08/94 1157 4197 -3040 26 12 2 0 0 5 2 6 NA No FP,No S,O=NE
<br /> MW-4 06/22/94 1157 4226 -30 69 <10 <0 3 <0 3 <0 3 <0 5 NA No FP,No S,O=NE
<br /> MW-4(45) 09/23/94 1157 4442 -3285 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=NE
<br /> MW-4(48) 12/02/94 1157 4369 -3212 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=NE
<br /> MW-4(63) 02/15/95 1157 4212 -3055 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=NE
<br /> MW-4(63) 05/12/95 1157 4028 -2871 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-4(63) 08/29/95 1157 4172 -30 15 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-4(63) 12/04/95 1157 4044 -2887 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-4 02/02/96 1157 3854 -2697 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW4(63) 05/10/96 1157 3602 -2445 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0
<br /> MW-4(63) 08/29/96 1157 37 60 -2603 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0
<br /> MW4(63) 11/20/96 1157 3671 -25 14 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0
<br /> MW-5
<br /> W-44-MW5 03/29/93 937 44 25 4200 -3488 930 16 <0 5 19 97 NA No FP,No S,Yes 0
<br /> MW-5(61) 06/07/93 937 4338 -34 01 1,100 40 14 42 58 NA No FP,No S,Yes 0
<br /> MW-5(60) 09/02/93 9 37 45 32 -3595 1,200 76 17 52 57 NA No FP,No S,Yes 0
<br /> MW-5(60) 12/16/93 937 43 03 -3366 820 34 14 39 41 NA No FP,No S,Yes 0
<br /> MW-5(39) 04/08/94 9 37 3999 -3062 4,800 640 68 670 800 NA No FP,No S,O=NE
<br /> MW-5 06/22/94 937 4054 -31 17 9,200 1,100 140 1,300 2,000 NA No FP,No S,0=N
<br /> MW-5(43) 09/23/94 937 4278 -3341 2,700 400 31 150 310 NA No FP,No S,O=NE
<br /> MW-5(46) 12/02/94 937 4189 -3252 2,200 380 28 210 330 NA No FP,No S,O=NE
<br /> MW-5(60) 02/15/95 937 4028 -3091 6,700 420 87 620 1,100 NA No FP,No S,O=NE
<br /> MW-5(61) 05/12/95 9 37 3895 -2908 5,000 560 110 400 600 NA No FP,No S,Yes 0
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