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TABLE 6 Well Construction Details Former ARCO Service Station No. 2168 441 W Charter Way, Stockton, CA Elevation BoringBorehole Casing Screened Filter Pack Cement Seal Well I.D. Construction (TOC feet Depth Diameter Diameter Casing Slot Size Interval Zone Interval(feet Bentonite Seal Interva Interval Comments Date above MSL (feet inches inches Material (inches) (feet bgs) bgs) (inches) (inches) (feet bgs) bgs) 9 ) (feet bgs) Monitoring Wells MW-1 4/27/1992 10.02 56 10 4 PVC 0.020 35-56 A 33.5-56 31-33.5 0-31 MW-1B 8/1/2000 9.91 90 16/8 2 PVC 0.020 75-90 B 72-90 45-72 0-75 MWAC 7/31/2000 9.97 120 16/8 2 PVC 0.020 105-120 C 102-120 45-102 0-45 MW-2 4/28/1993 10.54 56 10 4 PVC 0.020 37-56 A 33-56 29-33 0-29 MW-3 5/5/1992 11.21 55.5 10 4 PVC 0.020 48-55.5 A 32-55.5 30-32 0-30 MW-4 1/11/1993 NA 57 10.25 4 PVC 0.020 36-57 A 35-57 32.5-35 0-32.5 destroyed 10/3/05 MW-5 1/12/1993 10.08 57 10.25 4 PVC 0.020 37-57 A 35-57 33-35 0-33 MW-6 10/6/1993 8.92 53 8.25 2 PVC 0.020 31-53 A 29-53 25-29 0-25 MW-7 10/7/1993 8.85 50 8.25 2 PVC 0.020 30.5-50 A 28-50 25-28 0-25 MW-8 8/2/2000 11.12 30 8 2 PVC 0.020 15-30 A 13-30 11-13 0-11 MW-8B 8/2/2000 10.63 90 16/8 2 PVC 0.020 75-90 B 72-90 45-72 0-45 MW-8C 8/3/2000 10.99 120 16/8 2 PVC 0.020 105-120 C 102-120 45-120 045 MW-9 11/15/2005 9.30 32.5 8 2 PVC 0.020 17-32 A 15-32.5 12-15 0-12 MW-10 11/15/2005 NA 32.5 8 2 PVC 0.020 17-32 A 15-32.5 12-15 0-12 MW-11 11/14/2005 11.65 32 8 2 PVC 0.020 17-32 A 15-32 12-15 0-12 MWA2 1 11/15/2005 1 10.00 1 32.5 1 8 1 2 1 PVC 1 0.020 17-32 1 A 1 15-32.5 1 12-15 1 0-12 Vapor Wells VW-1 5/6/1992 NA 40 10 4 PVC 0.10 1540 A 1340 11-13 0-11 VW-2 5/7/1992 NA 40 10 4 PVC 0.10 1640 A 1440 12-14 0-12 destroyed 10/3/05 VW-3 5/7/1992 NA 40 10 4 PVC 0.10 1540 A 1441 12-14 0-12 destroyed 10/3/05 , VW-4 1/11/1993 NA 41 8.25 4 PVC 0.10 5-25 A 4-25 2-4,26-26 0-2 destroyed 1013/05 VW-5 1/12/1993 NA 26 8.25 4 PVC 0.10 5-26 A 4-26 24 0-2 destroyed 10/3/05 VW-6 1/13/1993 NA 29.5 8.25 4 PVC 0.10 14.5-29.5 A 13.5-29.5 10.5-13.5 0-10.5 VW-7 1/13/1993 NA 41 8.25 4 PVC 0.10 17-27 A 16-27 13.5-16,28-29 0-13.5 VW-8 5/12/1995 NA 26.5 8 4 PVC 0.10 10.8-24.8 A 7.5-25.7 4.5-7.5 04.5 VW-9 5/12/1995 NA 26.5 8 4 PVC 0.10 6.2-20.3 A 5.2-21 3.8-5.2,21-22.5 0-3.8 destroyed 10/3/05 VW-10 7/24/1996 NA 26 8 4 PVC 0.010 6-25.5 A 5-26 3-5 0-3 VW-11 7/24/1996 NA 26 10 4 PVC 0.010 6-25.5 A 5-26 3-5 0-3 7W-12 7/24/1996 NA 26 10 4 PVC 0.010 6-25.5 A 5-26 3-5 0-3 destroyed 10/3/05 VW-13 7/24/1996 NA 1 26 1 10 1 4 1 PVC 1 0.010 1 6-25.5 1 A 1 5-26 1 3-5 1 0-3 1 destroyed 10/3/05 02168 3Q06 Tables Page 1 of 3 SECOR