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I SUMMARY OF GROUNDWATER ATION AND ANALYTICAL DATA STOCKTON MAINTENANCE STATION STOCKTON,CALIFORNIA Depth To Groundwater TPH-G TPH-D Benzene Toluene Ethyl- benzene Total MTBE Weil I D Date TOC Eleva[ton Groundwater Elevation WA) (µg11) (10 (9911) (jLgA) Xylenes (Ns/11 (µBn) MW-12 02/05/1996 2219 63 50 4131 <50 <50 <0 3 <0 3 <0 3 <0 3 <0 5 M W4 2 04/11/1996 22 19 6189 -3970 --- — -- --- — -- --- MW-12 04/22/1996 22 19 6162 -3943 <50 100 <0 5 <0 5 <0 5 1 <0 5 <0 5 MW 12 07101/1996 22 19 6051 3832 <50 140 <0 5 <0 5 <0 5 <0 5 <0 5 2Q MW l2dup NA NA NA NA <500 — 04 1 9 0 5 2 3 <06 MW-12 10122/1996 22 19 60 89 -3870 <50 53 <0 5 <0 5 <0 5 <0 5 <0 5 3Q MW-12dup NA NA NA NA <500 — 0 9 1 0 <0 3 0 9 <06 MW-12 05/25/1997 22 19 55 85 3366 <500 <500 0 4 1 9 4 5 2 l <0 b MW-12 05/27/1997 22 19 55 85 3366 <500 <500 0 4 1 9 05 2 1 <0 b MW 12 10117/1997 22 19 5798 -35 79 <500 <500 0 8 08 <0 3 08 <06 MW-12 12/29/1997 22 19 5740 -35 21 <50 <5000 <0 5 0 60 <0 5 1 1 <5 MW-12 03/16/1998 22 19 53 Al -3162 <50 70 0 91 200 0 7 4 1 <5 MW-12 06/26/1998 22 19 50 12 2793 <500 <5000 09 040 1 1 2 1 (<5) MW-12 09/28/1998 22 19 52 04 -2985 <500 <5000 <0 3 <0 3 <0 3 <0 6 <0 6(<5) MW-12 12/02/1999 22 19 50 19 -2900 <500 <400 <0 6 <10 <1 0 2 0 <1 0( MW-12 04/01/1999 22 82 46 58 -23 76 <100 <100 <0 I <0 2 <0 1 <0 I <0 6 MW 12 06/28/1999 2282 4703 -2421 <100 <100 <0 3 <0 2 <0 2 <0 4 VW 1 05102/1995 2173 64 40 4267 — --- --- — — --- --- V W-1 06106/1995 21 73 6383 4210 28 000 600 5 300 2 500 300 2000 --- VW-1 02/06/1996 2173 6296 4123 10000 <50 1700 1300 860 960 <50 VW-1 04/11/1996 21 73 6142 -3969 — — --- — — -- --- V W 1 04/23/1996 2173 61 12 -3919 16 000 <50 720 1 500 580 1 700 98 VW-1 07/02/1996 21 73 5998 -3825 1 13 000 650 3 500 260 470 1 300 37 VW 1 10123/1996 2173 60 37 3864 8200 190 1 900 271 220 370 31 VW l 05128/1997 21 73 55 37 -3364 7 100 <500 1 400 21 140 180 7 4(<5) VW-1 10121/1997 21 73 57 48 -3575 2,700 <500 840 12 32 140 8 2(<5) 3Q VW-idup NA NA NA NA — -- — — — -- <5 VW 1 M911997 2173 5694 -35 21 1,700 440 450 11 21 120 <5 VW-1 03/16/1998 21 73 5347 -3174 1 500 640 280 <0 5 31 92 <5 VW-1 06/26/1998 21 73 4966 2793 <500 <5000 19 3 7 5 9 4 1 (<5) VW I 09/28/1998 2173 5155 -2982 500 <5000 43 23 3 1 5 0 1 8(<5) VW 1 12102/1998 21 73 4978 -2805 <500 <400 30 <1 0 3 0 04 1 0(<1 0) VW 1 03/3111999 2198 4627 2429 <100 <100 24 <0 2 <0 I <0 I <0 6 VW-1 06125!1999 2198 4656 -24 58 550 <100 8 1 <0 2 <0 2 <0 4 <0 6 2Q V W-idup 06/2511999 NA NA NA 580 1 <100 8 <0 2 <0 2 <0 4 <0 6' 1x72 2A�1—x1, Page 8 of 9