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Project No.S810u-06-11C December 17,1996 Page 3 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) Gµg/1) (µg/I) (µg/1) Gig/1) (gg/1) Gµg/1) BY MW-8dup 2/5/96 62.68 21.48 -41.20 290 <50 4.4 <0.3 <0.3 <0.3 81 Geocon MW-8 4/11/96 61.17 21.48 -39.69 --- --- --- --- --- --- Geocon MW-8 4/22/96 60.84 21.48 -39.36 300 80 13 <0.5 <0.5 <0.5 4.8 Geocon MW-8 7/1/96 59.69 21.48 -38.21 100 60 0.5 <0.5 <0.5 <0.5 0.6 Geocon MW-8dup 7/1/96 59.69 21.48 -38.21 100 60 0.5 <0.5 <0.5 <0.5 0.6 Geocon MW-8 10/22/96 60.09 21.48 -38.61 300 110 12 <0.5 <0.5 <0.5 5.4 Geocon VW-1 5/2/95 64.40 21.73 -42.67 --- --- --- --- --- --- - Geocon VW-1 6/6/95 63.83 21.73 -42.10 28,000 600 5,300 2,500 300 2,000 --- Geocon VW-1 2/6/96 62.96 21.73 -41.23 10,000 <50 1,700 1,300 860 960 <50 Geocon VW-1 4/11/96 61.42 21.73 -39.69 --- --- --- --- --- --- --- Geocon VW-1 4/23/96 61.12 21.73 -39.39 16,000 <50 720 1,500 580 1,700 9.8 Geocon VW-1 7/2/96 59.98 21.73 -38.25 13,000 650 3,500 260 470 1,300 37 Geocon VW-1 10/23/96 60.37 21.73 -38.64 8,200 190 1,900 271 220 370 31 Geocon VW-2 2/6/96 63.17 21.90 -41.27 16,000 <50 3,000 3,100 260 2,000 <50 Geocon VW-2dup 2/6/96 63.17 21.90 -41.27 24,000 <50 4,700 4,700 2,500 2,800 <100 Geocon VW-2 4/11/96 61.63 21.90 -39.73 --- --- --- --- --- -- --- Geocon VW-2 4/23/96 61.37 21.90 -39.47 54,000 <50 8,100 5,600 290 6,500 60 Geocon VW-2 7/2/96 60.19 21.90 -38.29 20,000 1,400 3,000 1,700 200 1,700 53 Geocon VW-2dup 7/2/96 60.19 21.90 -38.29 20,000 1,400 3,500 2,000 200 1,900 58 Geocon VW-2 10/23/96 60.55 21.90 -38.65 17,000 570 4,200 1,300 89 430 43** Geocon VW-2dup 10/23/96 --- 21.90 --- 15,000 --- 3,600 1,100 74 360 36** Geocon MW-9 2/5/96 61.15 20.43 -40.72 <50 <50 <0.3 <0.3 <0.3 <0.3 <0.5 Geocon MW-9 4/11/96 60.25 20.43 -39.82 --- --- --- --- --- --- --- Geocon MW-9 4/22/96 59.99 20.43 -39.56 <50 <50 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon MW-9dup 4/22/96 59.99 20.43 -39.56 <50 --- <0.5 <0.5 <0.5 <0.5 <0.5 Geocon MW-9 7/1/96 58.81 20.43 -38.38 <50 <50 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon MW-9 10/22/96 59.18 20.43 -38.75 <50 <50 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon MW-10 2/5/96 62.50 21.44 -41.06 <50 <50 <0.3 <0.3 <0.3 <0.3 <0.5 Geocon MW-10 4/11/96 61.10 21.44 -39.66 --- --- --- --- --- Geocon MW-10 4/22/96 NM 21.44 NM --- --- --- --- --- --- Geocon MW-10 7/1/96 NM 21.44 NM --- --- --- --- Geocon MW-10 10/22/96 60.18 21.44 -38.74 <50 68 1.0 0.9 <0.5 0.5 <0.5 Geocon MW-10dup 10/22/96 --- 21.44 --- <50 --- 1.0 0.9 <0.5 <0.5 <0.5 Geocon