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M mom M M M M M M M M M M M M mow M Project No S8100-06-62 No,6ember 27 1996 Page 2 of 4 TABLE. l SUMMARY OF GROUNDWATER ELEVATION AND ANALY TICAL DATA CALTRANSSHOP 10 1603 SOUTH B STREE r STOCKTON CA TOC Depth to Groundwater' Ethyl- Total Well Elevation Groundwater Elevation TPHg TPI Id Benzene 1 oluene benzene Xylenes MTBE Sampled by Number Date (MSL) (feet) (MSL) (µg11) (µg/1) (µg/1) (µg/1) (µg11) WWI) 41g/1) MW-7 05/04/90 10000 50 78 4022 <50 NA 15 <0 5 <0 5 <0 5 --- WCC MW-7 05/17/91 10000 6450 3550 <50 NA <0 5 <0 5 <0 5 <0 5 --- WCC MW-7 07/05/91 10000 6496 3504 --- NA --- --- -- --- --- WCC MW-7 04/07/92 2103 6528 -44 25 <30 <30 <0 3 <0 3 <0 3 <0 37 --- ALTON MW-7 10/22/93 2103 6714 -4611 ND --- ND ND ND ND --- EA MW-7 05/24/94 2103 64 90 -43 87 --- --- --- -- --- — -- NM MW-7 07194 Well abandoned/removed MW-8 05/11/90 10036 5989 4047 1,900 --- 200 5 1 07 22 --- WCC MW 8 05/17/91 10036 6474 3562 <50 --- <0 3 <0 3 <03 <0 3 --- WCC MW-8 07/05/91 10036 6522 3514 — --- --- --- -- --- --- WCC MW-8 04/07/92 2135 65 56 4421 <30 <50 <0 3 0 57 <0 3 <0 3 --- ALTON MW-8 05/24/94 2135 65 18 -43 83 --- --- --- --- --- -- --- NM MW-8 07/94 Well abandoned/removed MW-9 05/10/90 10087 6042 4045 3,400 --- 60 8 0 <0 5 170 --- WCC MW-9 05/17/91 10087 6534 35 53 2,100 --- 310 10 17 32 --- WCC MW-9 07/05/91 10087 6583 35 04 --- --- --- --- --- --- --- WCC MW-9 04/07/92 2188 DRY -- - — --- --- ALTON MW-9 05/24/94 2189 65 84 4396 --- -- --- --- --- -- -- NM MW-9 04/23/96 22 022 6075 -38 73 90 <50 1 1 13 <0 5 14 14 GEOCON MW-9 07/02/96 2202 5966 -3764 200 70 89 24 53 30 18 GEOCON MW-9 10/23/96 22 02 6010 -3808 60 80 1 7 16 <0 5 2 3 08 GEOCON MW-10 04/07/92 2187 6626 4439 5,600 18 920 460 38 520 --- ALTON MW 10 10/22/93 2187 67 18 4531 8 000 --- 1 300 1,000 190 700 --- EA MW 10 05/27/94 2187 65 94 4407 2 570 ND 13,000 3,400 229 2 800 -- NM MW-10 07/94 Well abandoncd/removed MW-I 1 04/07/92 2137 6594 -4457 420 <50 33 068 037 064 - ALTON MW-1 l 10/22/93 2137 6792 4655 150 --- 4 2 2 2 ND I I - EA MW-11 05/27/94 2137 65 63 -44 26 ND ND 6 58 189 ND ND --- NM MW-11 04/22/96 2165 DRY NA --- — -- --- --- -- --- GEOCON MW 11 07/02/96 Well blocked with debris --- --- --- -- --- -- --- GEOCON MW 11 10/24/96 2165 6010 -3845 <50 64 <0 5 <0 5 <0 5 <0 5 <0 5 GEOCON MW-12 04/07/92 2123 65 86 -4463 <30 <50 <0 3 <0 3 <0 3 <0 3 --- ALTON MW 12 10/22/93 2123 6774 -4651 ND - 0 6 17 ND I 1 --- EA MW-12 05/27/94 2123 6563 -4426 ND ND 137 0 69 ND ND --- NM MW-12 04/24/96 2123 6046 3923 300 <50* 11 55 11 52 <0 5 GEOCON MW-12 07/02/96 21 23 5920 -37 97 500 140 23 110 7 9 110 <0 5 GEOCON MW-12 10/24/96 2150 5975 -3825 <50 63 <0 5 0 6 <0 5 0 5 <0 5 GEOCON