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Pro3ectNo S - 6-11b M M M M M IS M M M M M M M 4r M Apnl 19,1996 PAGE 1 OF 2 TABLE III CUMULATIVE SUMMARY OF GROUNDWATER MONITORING DATA AND ANALYTICAL RESULTS CALTRANS STOCKTON YARD MAINTENANCE FACILITY STOCKTON,CALIFORNIA WELL ID DATE DEPTH TO TOC GROUNDWATER TPH9 TPHd B T E X MTBE SA BPLED GROUNDWATER ELEVATION (ug/L) (uglL) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) MW-1 416/92 6596 2149 -4447 4,900 180* 1,100 360 <3 400 --- AG MW-1 10122193 6792 2149 4643 27,000 --- 11,000 1,500 <50 1 400 --- EA MW-1 611194 65 68 2149 -44 19 1,500 <50 13,700 418 145 206 — N&M MW-1 3/6/95 65 01 2149 -4352 2,200 280 150 75 13 71 Geocon MW-Idup 3/6195 6501 2149 4352 2,300 — 150 80 13 71 --- Geocon MW-1 3/8/95 6503 2149 -43 54 — -- Geocon MW-1 512195 6418 2149 -4269 -- -- -- — - Gcocon MW-1 515195 --- 2149 --- 2,900 <50 240 110 13 100 --- Geocon MW-ldup 515195 --- 2149 --- -- <50 --- — --- Geocon MW-I 216196** 6203 2149 -4054 2,200 <50 280 130 30 110 100 Geocon MW-1 4111196 6123 2149 -3974 --- --- --- --- --- --- Geocon MW-2 416/92 66 17 2171 4446 3,200 73* 450 12 <3 49 — AG MW-2 10/22/93 68 12 2171 -4641 4,500 --- 1,000 93 25 170 — EA MW-2 6/1194 65 85 2171 -4414 588 <50 337 151 <2 5 457 -- N&M MW-2 316/95 6528 21 7t 4357 1,400 100 150 10 53 15 Geocon MW-2 318195 6521 2171 -4350 -- --- --- --- --- --- --- Geocon MW-2 512195 6436 2171 4265 --- -- --- Geocon MW-2 5/5/95 -- 2171 --- 600 <50 78 11 25 10 -- Geocon MW-2 216/96** 6296 2171 -4125 <50 <50 23 <0 3 <0 3 <0 3 <0 5 Geocon MW-2 4111/96 6142 2171 -3971 --- --- — --- -- --- --- Geocon MW-3 416192 6598 2141 -4457 2,400 84* 260 98 <3 22 --- AG MW-3 10/22/93 6780 2141 -4639 4,700 -- 520 100 90 110 --- EA MW-3 6/1/94 6548 2141 -4407 1,200 <50 238 411 <50 295 --- N&M MW-3 316195 6501 2141 4360 1,700 110 150 38 41 38 --- Geocon MW-3dup 316/95 6501 2141 -43 60 1,900 -- 140 37 40 37 --- Geocon MW-3 318195 6491 2141 -43 50 --- - Geocon MW-3 512195 6408 2141 -4267 -- --- -- — Gcocon MW-3 515/95 --- 2t 41 --- 650 <50 400 60 29 90 --- Geocon MW-3 216/96** 6269 2141 -4128 180 <50 20 25 <03 33 94 Geocon MW-3 4111/46 6136 2141 -3995 -- --- --- --- -- -- Geocon MW4 512195 6420 2163 -4257 130 <50 <0 5 06 <0 5 <0 5 -- Geocon MW4 215196 6281 2163 4118 83 <50 <0 3 <0 3 <0 3 <0 3 13 Geocon MW-4 4111196 6125 2163 -3962 --- --- --- --- -- --- -- Geocon � --- Geocon MW-5 512/95 64 16 2156 -4260 --- --- --- -- MW 5 515195 --- 21 56 --- 130 <50 17 08 <0 5 70 -- Geocon MW-5dup 515195 --- 2156 -- 120 5 i 5 0 6 <0 5 6 0 Geocon MW-5 215196 6265 2156 -41 09 51 <50 <0 3 <0 3 <0 3 <0 3 <0 5 Geocon MW-5 4111/96 6126 21 56 -3970 ---