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Project No.S81w-06-11C December 17, 1996 Page 2 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) (µg/1) (µg/1) (µg/1) (µg/1) (µg/1) (µg/1) (µg/1) BY MW-3dup 4/23/96 --- 21.41 --- 400 250 93 32 14 36 1.5 Geocon MW-3 7/2/96 59.78 21.41 -38.37 15,000 470 2,700 1,900 530 2,000 36 Geocon MW-3 10/22/96 60.02 21.41 -38.61 1,900 160 370 130 69 200 13 Geocon MW-4 5/2/95 64.20 21.63 -42.57 130 <50 <0.5 0.6 <0.5 <0.5 --- Geocon MW-4 2/5/96 62.81 21.63 -41.18 83 <50 <0.3 <0.3 <0.3 <0.3 13 Geocon MW-4 4/11/96 61.25 21.63 -39.62 --- --- --- --- --- Geocon MW-4 4/22/96 60.99 21.63 -39.36 300 80 2.3 <0.5 0.6 <0.5 0.6 Geocon MW-4 7/1/96 59.87 21.63 -38.24 <50 <50 0.9 <0.5 <0.5 <0.5 0.5 Geocon MW-4 10/22/96 60.24 21.63 -38.61 <50 66 1.0 <0.5 <0.5 <0.5 <0.5 Geocon MW-5 5/2/95 64.16 21.56 -42.60 --- --- --- --- --- --- --- Geocon MW-5 5/5/95 --- 21.56 --- 130 <50 1.7 0.8 <0.5 7.0 - Geocon MW-5dup 5/5/95 --- 21.56 --- 120 --- 1.5 0.6 <0.5 6.0 --- Geocon MW-5 2/5/96 62.65 21.56 -41.09 51 <50 <0.3 <0.3 <0.3 <0.3 <0.5 Geocon MW-5 4/11/96 61.26 21.56 -39.70 --- --- --- --- --- Geocon MW-5 4/22/96 61.03 21.56 -39.47 50 <50 0.7 0.7 <0.5 0.8 <0.5 Geocon MW-5 7/1/96 59.84 21.56 -38.28 <50 <50 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon MW-5 10/22/96 60.21 21.56 -38.65 <50 110 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon MW-6 5/2/95 63.61 20.92 -42.69 --- --- --- --- --- --- --- Geocon MW-6 5/5/95 --- 20.92 --- 1,800 <50 250 1.7 5.5 13 --- Geocon MW-6 2/6/96 62.10 20.92 -41.18 900 <50 380 39 2.5 1.9 <0.5 Geocon MW-6 4/11/96 60.68 20.92 -39.76 --- --- --- --- --- --- --- Geocon MW-6 4/22/96 60.45 20.92 -39.53 6,700 <50 2,500 230 220 360 16 Geocon MW-6 7/1/96 59.29 20.92 -38.37 17,000 410 1,600 52 570 2,000 34 Geocon MW-6 10/22/96 59.64 20.92 -38.72 6,800 560 1,900 <5 140 410 36 Geocon MW-7 5/2/95 63.96 21.27 -42.69 --- --- --- --- --- --- --- Geocon MW-7 5/5/95 --- 21.27 --- 1,700 <50 13 4.3 0.7 4.4 Geocon MW-7 2/6/96 62.55 21.27 -41.28 340 <50 5.9 5.2 <0.3 2.8 52 Geocon MW-7 4/11/96 61.04 21.27 -39.77 --- --- --- --- --- --- --- Geocon MW-7 4/22/96 60.74 21.27 -39.47 300 200 8.4 0.6 <0.5 1.2 1.2 Geocon MW-7 7/1/96 59.60 21.27 -38.33 400 70 23 <0.5 <0.5 4.0 10 Geocon MW-7 10/22/96 59.95 21.27 -38.68 500 110 17 <0.5 <0.5 1.9 7.4 Geocon MW-8 5/2/95 64.11 21.48 -42.63 550 <50 3.1 1.8 0.6 4.0 --- Geocon MW-8 2/5/96 62.68 21.48 -41.20 360 <50 5.5 <0.3 <0.3 <0.3 100 Geocon