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Project No . 00-06-62 August 22, 1996 Page 2 of 3 TABLE 1 CUMULATIVE SUMMARY OF GROUNDWATER MONITORING DATA AND ANALYTICAL RESULTS CALTRANS STOCKTON YARD MAINTENANCE FACILITY STOCKTON,CALIFORNIA WELL ID DATE DEPTH TO TOC GROUNDWATER TPHg TPHd B T E X MTBE SAMPLED GROUNDWATER ELEVATION ELEVATION (ugll) (ug/1) (ug/1) (ugl]) (ugll) (ug/1) (ugll) BY (mg/1) (mgll) MW-4 4111/96 6125 2163 -3962 --- --- --- --- --- --- --- Geocon MW4 4122196 6099 21 63 -3936 300 80 23 <0 5 06 <0 5 06 Geocon MW-4 711196 5987 2163 -3824 <50 <50 09 <0 5 <0 5 <0 5 05 Geocon MW-5 512195 64 16 21 56 -4260 --- --- --- --- --- --- --- Geocon MW-5 515195 -- 2156 --- 130 <50 17 08 <0 5 70 --- Geocon MW-5dup 5/5195 --- 2156 --- 120 --- 15 06 <0 5 60 --- Geocon MW-5 215196 6265 21 56 -4109 51 <50 <0 3 <0 3 <03 <03 <0 5 Geocon MW-5 4111/96 6126 2156 -3970 --- --- --- --- --- --- --- Geocon � MW-5 4122196 61 03 21 56 -3947 50 <50 07 07 <0 5 08 <0 5 Geocon MW-5 7/1/96 5984 2156 -3828 <50 <50 <0 5 <0 5 <0 5 <05 <05 Geocon MW-6 512/95 6361 2092 -4269 --- --- --- --- --- --- --- Geocon MW-6 515195 -- 20 92 --- 1,800 <50 250 17 5 5 13 --- Geocon MW-6 2/6/96 62 10 2092 -41 18 900 <50 380 39 25 19 <0 5 Geocon MW-6 4111196 6069 2092 -3976 --- --- --- --- --- --- --- Geocon MW-6 4122196 6045 2092 -3953 6,700 <50 2 500 230 220 360 16 Geocon MW-6 7/1196 5929 2092 -3837 17,000 410 1,600 52 570 2,000 34 Geocon MW-7 5/2195 6396 2127 4269 --- --- --- --- --- --- --- Geocon MW-7 515/95 --- 2127 --- 1,700 <50 13 43 07 44 --- Geocon MW-7 2/6196 6255 2127 4128 340 <50 59 52 <0 3 28 52 Gcocon MW-7 4111/96 6104 2127 -3977 Geocon MW-7 4122196 6074 2127 -3947 300 200 84 06 <05 12 12 Geocon MW-7 7/1196 5960 2127 -3833 400 70 23 <0 5 <0 5 40 10 Geocon MW-8 512/95 6411 2148 -4263 550 <50 31 is 06 40 --- Geocon f MW-8 215196 6269 2148 -4120 360 <50 55 <0 3 <03 <0 3 100 Geocon MW-8dup 215/96 6268 2148 -4120 290 <50 44 <0 3 <0 3 <03 81 Geocon MW-8 4111196 61 17 2148 -3969 --- --- --- --- --- --- --- Geocon MW-8 4122196 6084 2148 -3936 300 80 13 <0 5 <0 5 <0 5 48 Geocon MW-8 711196 5969 2148 -3821 100 60 05 <0 5 <0 5 <0 5 06 Geocon MW 8dup 7/1/96 5969 2148 -3821 100 60 05 <05 <0 5 <0 5 06 Geocon VW-1 5/2/95 6440 2173 -4267 -- --- --- --- --- --- --- Geocon VW-1 616195 6383 2173 -4210 28 000 600 5 300 2,500 300 2,000 --- Geocon VW-1 2/6196 6296 2173 -4123 10000 <50 1,700 1,300 860 960 <50 Geocon VW-1 4/11196 6142 2173 -3969 --- --- --- --- --- --- --- Geocon VW-1 4123/96 6112 21 73 -3939 16,000 <50 720 1 500 580 1 700 98 Geocon VW-1 7/2196 5998 2173 -3825 13,000 650 3,500 260 470 1 300 37 Geocon VW-2 216196 6317 2190 -4127 16,000 <50 3,000 3,100 260 2,000 <50 Geocon VW-2dup 2/6/96 6317 2190 -4127 24,000 <50 4,700 4,700 2,500 2,800 <100 Geocon