ARCHIVED REPORTS_SEMI ANNUAL GROUNDWATER MONITORING OCTOBER 2010

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Table 1 Well Construction Details Chevron Facility#306620 (Former Unocal #5088) 5606 Pacific Avenue Stockton, California Well Dep#h.to Blank Screened Hydrostrstigraphie Sand Bentoni#e Cement/ Numtser Bottom Casing Tnterva} Unit Pack Seal Grout byj bs tis) 60 6s) bs) Groundwater ordtoring Wells MW-1 68 0 to 48 48 to 68 B 43 to 68 40.7 to 43 0 to 40.7 MW-2 68 0 to 48.5 48.5 to 68.5 B 43 to 68 41.5 to 43 0 to 41.5 MW-3 67 0 to 47 47 to 67 B 45 to 67 43 to 45 0 to 43 MW-4 68 0 to 48 48 to 68 B 46 to 68 44 to 46 0 to 44 M W-5 68 0 to 48 48 to 68 B 46 to 68 44 to 46 0 to 44 MW-6 67.5 0 to 47.5 47.5 to 67.5 B 45.5 to 47.5 43.5 to 45.5 0 to 43.5 MW-7 67 0 to 42 42 to 67 B 40 to 67 37.5 to 40 0 to 37.5 MW-8D M52 7 97 to 102 D 95 to 102 92 to 95 0 to 92 MW-9R 0 50 to 70 B 45 to 70 40 to 45 0 to 40 MW-10 0 50 to 70 B 48 to 70 48 to 50 0 to 48 MW-1 OA 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-1 1 2.5 52.5 to 72.5 B 50.5[0 72.5 46 to 48 0 to 46 MW-12 51 SI to 71 B 49 to71 47 to 49 Oto 47 M W-13 48 48 to 68 B 46 to 68 44 to 46 0 to 44 MW-14 69 0 to 49 1 49 to 69 B 47 to 69 45 to 69 0 to 45 MW-14A 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-15 69 0 to 49 49 to 69 B 47 to 69 45 to 69 0 to 45 MW-16 64 0 to 44 44 to 64 B 42 to 64 40 to 42 0 to 40 MW-17 65 0 to 45 45 to 65 B 43 to 65 41 to 43 0 to 41 MW-18 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-18D 660 to 61 61 to 66 B 60 to 66 57 to 60 0 to 57 MW-19D 66 0 to 61 61 to 66 B 60 to 66 58 to 66 0 to 58 MW-21S 49 0 to 29 29 to 49 A 27 to 49 25 to 27 0 to 25 MW-21D 66 0 to 61 61 to 66 B 60 to 66 58 to 66 0 to 58 MW-22S 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-22D 66 0 to 61 61 to 66 B 59 to 66 56 to 59 0 to 56 MW-24S 90 0 to 85 85 to 90 C 83 to 90 81 to 83 0 to 81 MW-24D 103 0 to 98 98 to 103 D 98 to 103 90 to 98 0 to 81 MW-27 65 0 to 45 45 to 65 B 43 to 65 40 to 43 6-to 40 MW-28 700 to 50 50 to 70 B 44.5 to 70 42.5 to 44.5 0 to 42.5 MW-29 70 0 to 50 50 to 70 B 44.7 to 70 42.4 t.44.7 0 to 42.4 MW-30 70 0 to 50 50 to 70 B 42 to 70 40 to 42 0 to 42 60146576 1 of AECOM