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Project No.S810v-06-11C December 17,1996 Page 1 of 4 TABLE 3 CUMULATIVE SUMMARY OF GROUNDWATER MONITORING DATA AND ANALYTICAL RESULTS CALTRANS STOCKTON YARD MAINTENANCE FACILITY STOCKTON,CALIFORNIA DEPTH TO TOC GROUNDWATER GROUNDWATER ELEVATION ELEVATION TPHg TPHd B T E X MTBE SAMPLED WELL ID DATE (feet) (MSL) (MSL) 4tg/1) (µg/1) (µg/1) 6tg/1) (µg/1) (µg/1) (µg/1) BY MW-1 4/6/92 65.96 21.49 -44.47 4,900 180* 1,100 360 <3 400 --- AG MW-1 10/22/93 67.92 21.49 -46.43 27,000 --- 11,000 1,500 <50 1,400 --- EA MW-1 6/1/94 65.68 21.49 -44.19 1,500 <50 13,700 418 14.5 206 --- N&M MW-1 3/6/95 65.01 21.49 43.52 2,200 280 150 75 13 71 --- Geocon MW-ldup 3/6/95 65.01 21.49 -43.52 2,300 --- 150 80 13 71 --- Geocon MW-1 3/8/95 65.03 21.49 -43.54 --- --- --- --- --- --- Geocon MW-1 5/2/95 64.18 21.49 -42.69 --- --- --- --- --- --- --- Geocon MW-1 5/5/95 --- 21.49 --- 2,900 <50 240 110 13 100 --- Geocon MW-ldup 5/5/95 --- 21.49 --- --- <50 -- Geocon MW-1 2/6/96 62.03 21.49 -40.54 2,200 <50 280 130 30 110 100 Geocon MW-1 4/11/96 61.23 21.49 -39.74 --- --- --- --- --- --- --- Geocon MW-1 4/23/96 60.98 21.49 -39.49 4,200 680 1,100 300 123 300 25 Geocon MW-1 7/2/96 59.92 21.49 -38.43 51,000 2,600 10,100 7,200 1,100 6,600 38 Geocon MW-1 10/23/96 60.16 21.49 -38.67 1,700 87 440 37 49 70 32 Geocon MW-2 4/6/92 66.17 21.71 -44.46 3,200 73* 450 12 <3 49 --- AG MW-2 10/22/93 68.12 21.71 -46.41 4,500 --- 1,000 93 25 170 --- EA MW-2 6/1/94 65.85 21.71 -44.14 588 <50 337 151 <2.5 45.7 --- N&M MW-2 3/6/95 65.28 21.71 -43.57 1,400 100 150 10 5.3 15 --- Geocon MW-2 3/8/95 65.21 21.71 -43.50 --- --- --- --- --- --- --- Geocon MW-2 5/2/95 64.36 21.71 -42.65 --- --- --- --- --- --- Geocon MW-2 5/5/95 --- 21.71 --- 600 <50 78 11 2.5 10 Geocon MW-2 2/6/96 62.96 21.71 -41.25 <50 <50 2.3 <0.3 <0.3 <0.3 <0.5 Geocon MW-2 4/11/96 61.42 21.71 -39.71 --- --- --- --- Geocon MW-2 4/22/96 61.12 21.71 -39.41 70 90 6.9 0.6 0.5 <0.5 0.8 Geocon MW-2 7/1/96 60.05 21.71 -38.34 50 100 3.5 <0.5 <0.5 <0.5 0.5 Geocon MW-2 10/22/96 60.39 21.71 -38.68 400 200 8.6 <0.5 <0.5 0.8 8.0 Geocon MW-3 4/6/92 65.98 21.41 -44.57 2,400 84* 260 9.8 <3 22 --- AG MW-3 10/22/93 67.80 21.41 -46.39 4,700 --- 520 100 9.0 110 -- EA MW-3 6/1/94 65.48 21.41 -44.07 1,200 <50 238 411 <5.0 295 --- N&M MW-3 3/6/95 65.01 21.41 -43.60 1,700 110 150 38 4.1 38 --- Geocon MW-3dup 3/6/95 65.01 21.41 -43.60 1,900 --- 140 37 4.0 37 --- Geocon MW-3 3/8/95 64.91 21.41 43.50 --- --- --- --- -- --- --- Geocon MW-3 5/2/95 64.08 21.41 42.67 --- --- --- --- --- --- --= Geocon MW-3 5/5/95 --- 21.41 --- 650 <50 400 6.0 2.9 9.0 -- Geocon MW-3 2/6/96 62.69 21.41 -41.28 180 <50 2.0 2.5 <0.3 3.3 9.4 Geocon MW-3 4/11/96 61.36 21.41 -39.95 --- --- --- Geocon MW-3 4/23/96 60.90 21.41 -39.49 400 200 77 28 12 28 16 Geocon