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TABLE 2-2 SUMMARY OF GROUNDWATER ANALYTICAL DATA SHOP 10 MAINTENANCE STATION, CALTRANS STOCKTON, CALIFORNIA Sample TOC Depth to Groundwater TPHg TPHd Benzene Toluene Ethylbenzene Toil MTBE Well I.D. Date Elevation Groundwater Elevation (Ngll) (Ng �N90) ll) {Ng0) W/1) W/O xylenes (N911) 5/17/91 100000 35 0 <60 NA I <0 5 <0 5 <0 MW-7 715191 10000 6496 3504 NA MW-7 417192 2103 6528 -4425 <30 <0 3 <0 3 <0 3 <0 3 MW-7 10/22/93 2103 6714 4611 ND ND ND ND ND MW-7 5124194 2103 6490 -4387 Well an one emove 9 00 6 91,9000 MW-8 5117191 10036 6474 3562 <50 <0 3 <0 3 <0 3 <0 3 MW-8 715191 10036 6522 3514 MW-8 417192 2135 6556 4421 <50 <50 <0 3 057 <0 3 <0 3 MW-8 5124194 ME] 6518 -4383 Well an one emove 5/10/90 60 0 3,400 <0 Mg 9 5117191 10087 6534 3553 2,100 310 10 17 32 M W-9 715191 10087 6583 3504 MW-9 4/7192 2188 DRY ------ MW-9 5124194 2188 6584 4396 MW-9 4123196 2202 6075 -3873 90 <50 1 1 13 <0 5 14 MW-9 712196 2202 5966 -3764 200 70 89 24 53 30 MW-9 10/23/96 2202 6010 -3808 60 80 17 16 <0 3 23 MW-9 5122197 2202 5512 -3310 <500 <500 <0 3 <0 3 <0 6 <0 6 <0 6 MW-9 9125197 2202 5740 -3538 <500 <500 <0 3 <0 3 <0 6 <0 6 <0 6 MW-9 12/29/97 2202 5675 -3473 <50 <5000 <0 5 <0 5 <0 5 <1 <5 MW-9 3116198 2202 — 5307 -3105 <50 81 <0 5 <0 5 <0 5 <1 <5 MW-9 6/15/98 2202 943 -2741 < < c < < < 92 6 -4439 ,600 18 920 520 MW-10 10122/93 21 87 6718 4531 8,000 1,300 1,000 190 700 MW-10 5127/94 2187 6594 -4407 2,570 ND 13,000 3,400 23 2,800 Well a an one remove MW-11 10122/93 2137 6792 -4655 150 42 22 ND 1 1 Mw-1 1 5127194 2137 6563 4426 ND ND 658 189 ND ND MW-11 1 4122196 2137 DRY MW-11 1 V2196 Well blocked with debns ' MW-11 10/24/96 2137 6010 -3873 <50 1 64 1 <0 5 <0 5 <0 5 <0 5 MW-9 9 5122197 137 55 17 -3380 <500 NA <D 3 <0 3 <0 6 <0 6 <06 Pop 2 T614-2101231'98