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SUMMARY OF GROUNDWATER DATION AND ANALYTICAL DATA STOCKTON MAINTENANCE STATION STOCKTON,CALIFORNIA Depth To Groundwater TPH-G TPH D Benzene Toluene Ethyl- benzene Total MTBE Well 1 D Date TOC Elevation Groundwater Elevation (µg11) (µg/1) (µms) ("A) (µms) Xylenes �P�3 (µt;11) MW-3 04/06/1992 21 41 65 98 -44 57 2 400 84• 260 9 a <3 22 MW-3 10/22/1993 2141 6790 -4639 4 700 — 520 100 9 0 110 MW 3 06/01/1994 2141 6548 -44 07 1200 <50 238 411 <5 295 — MW-3 03/06/1995 2141 6501 4360 1 700 110 150 38 4 1 38 — MW-3 03!0611995 2141 6491 -43 50 -- — — _- — — _ MW-3 L02100/19,96 5/02/1995 2141 6409 -42 67 — — --- — -- — M W-3 5105/1995 21 4 t --- -- 650 <50 400 6 0 29 9 0 — MW-3 2141 62 69 -4128 180 <50 2 2 5 <0 3 3 3 94 MW-3 4/11/1996 2141 61 36 -3995 — -- -- --- — - -_MW-3 4f2311996 2141 6090 -3949 400 200 77 28 12 28 16 MW-3 07/02/1996 2141 5978 -3937 15 000 470 2 700 1900 530 2 000 36 MW-3 10/23/1996 2141 6002 -3861 1,900 160 370 130 69 200 13 MW 3 05/25/1997 2141 55 08 -33 67 2 900 <500 490 210 100 290 1 5 MW-3 10012/1997 2141 5740 -35 99 <500 <500 1 1 <0 3 1 7 0 8 <0 6 2Q MW-3dup NA NA NA NA -- <50 — --- — — — M W 3 12/29/1997 2141 5663 -35 22 170 <50 12 98 4 1 13 0 <5 MW-3 03/16/1998 2141 5319 -3178 290 180 50 <05 15 17 <5 MW-3 06/26/1998 2141 4935 -27 94 <500 <5000 52 <0 3 2 1 (<5) MW-3 09/28/1998 21 41 5124 29 83 <500 <5000 08 <0 3 <0 3 <0 6 <0 6(<5) MW-3 12/02/1998 2141 4942 2801 <500 <400 <0 6 <1 0 <1 0 <3 0 <1 0(<1 0) MW-3 04102/1999 2192 4660 -24 69 NU NU NU NU NU NU NU MW-3 06125/1999 2192 4623 1 -24_31 1 <100 <100 <0 3 <0 2 <0 2 2 9 <0 6' Page 3 of 9