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M we _ Project No S8100-06-18A December 9, 1996 Page 2 of 3 TABLE 3 SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA CALTRANS SHOP 10 I 1603 SOUTH B STREET,STOCKTON,CA Well Date TOC Depth to Groundwater' TPHg TPHd Benzene Toluene Ethyl- Total MTBE Sampled by Number Elevation Groundwater(feet) Elevation 4,�) (µ�) 4L911) {µ1) benzene Xylenes WA) (MSL) (MSL) Wil) (µgA) MW-8 05/11/90 10036 5989 4047 1,900 — 200 5 1 07 22 WCC MW-8 05/17/91 10036 6474 35 62 <50 - <0 3 <0 3 <0 3 <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 07194 Well abandoned/removed I MW-9 05/10/90 10087 6042 4045 3,400 -- 60 8 0 <0 5 170 — WCC MW-9 05/17/91 10097 6534 3553 2,100 — 310 10 17 32 -- WCC MW-9 07/05/91 10087 65 83 3504 -- — -- --- -- --- — WCC MW-9 04/07/92 2188 DRY --- — — — --- — ALTON MW-9 05/24/94 2188 65 84 4396 — -- --- --- NM MW-9 04/23/96 2202 2 6075 -3873 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 2202 60 10 -3808 60 80 17 16 <0 5 23 0 8 GEOCON MW-10 04/07/92 2187 6626 -44 39 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 6594 -4407 2,570 ND 13,000 3,400 229 2,800 — NM MW-10 07194 Well abandoned/removed MW-11 04/07/92 2137 6594 4457 420 <50 33 068 037 064 --- ALTON MW-11 10/22/93 2137 6792 -46 55 150 --- 4 2 22 ND I I EA MW-11 05/27/94 2137 6563 -4426 ND ND 658 189 ND ND --- NM MW-11 04/22/96 2165 DRY --- --- — --- — — -- — 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 I 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 — 06 17 ND 1 1 — EA MW-12 05/27/94 2123 65 63 -4426 ND ND 137 069 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 2123 5920 -3797 500 140 23 110 79 110 <0 5 GEOCON MW-12 10/24/96 2150 5975 -3825 <50 63 <0 5 0 6 <0 5 0 5 <0 5 GEOCON MW-13 10/22/93 2094 67 12 4618 10 — 1,300 1,000 190 700 -- EA MW-13 05/26/94 2094 64 79 -43 85 ND ND ND 2 54 ND ND --- NM MW-13 04/24/96 2112 60 02 -3890 1,700 <50* 480 22 64 71 14 GEOCON MW-13 07/03/96 2112 5994 -3782 800 120 320 0 7 15 18 0 6 GEOCON MW-13 10/24/96 21 12 5941 -3829 2,500 170 1,000 <10 58 110 11 GEOCON MW-14 10/22/93 2195 6792 4597 ND --- ND 14 ND ND -- EA MW-14 05/26/94 2195 6560 4365 052 ND 58 7 596 ND 173 -- NM J e4 MW-14 04/24/96 2170 60 75 -3905 11,000 <50* 3200 320 410 1,000 <5 0 GEOCON MW-14 07/03/96 2170 5924 -3754 10,000 1,100 3,200 170 390 650 12 GEOCON MW-14 10/24/96 2170 5978 -3808 6,300 120 2,300 68 360 150 43 GEOCON I