SITE INFORMATION AND CORRESPONDENCE_2001-CURRENT

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Well Construction Details (by Well Type) Chevron Facility#306620 (Former Unocal#5098) 5606 Pacific Avenue, Sockton, California Depth to Blank Screened Hydro- Sand Bentonite Cement/ Line Well Bottom Casing Intercal stratigraphic Pack Seal Grout Number Number (ft bgs) (ft bgs) (B bgs) knit (ft bgs) (ft bgs) (k bgs) Well Type 24 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 GWM Well 25 MW-7 67 0 to 42 42 to 67 B 40 to 67 37.5 to 40 0 to 37.5 GWM Well 26 MW-82 102 0 to 97 97 to 102 D 95 to 102 92 to 95 0 to 92 GWM Well 27 M W-9R 70 --Tto 50 50 to 70 B 45 to 70 40 to 45 0-t.40 GWM Well 28 MW-10 70 O to 50 50 to 70 1 B 48 to 70 48 to 5o O to 48 GWM Well 29 MW-IOA 51.5 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 GWM Well 30 MW-11 72.5 Oto 52.5 52.5 to 72.5 B 505 to 72.5 46 to 48 Oto 46 GWM Well 31 MW-12 71 Oto 51 Slto 71 B 49to71 47to49 0to47 GWM Well 32 MW-13 68 0 to 48 4810 68 B 46 to 68 44 to 46 0 to 44 GWM Well 33 MW-14 69 0to49 49to69 B 47to69 45to69 0to45 GWM Well 34 MW-14A 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 GWM Well 35 MW-15R 43 Oto28 28to43 A 26to43 22.5to26 0to22.5 GWM Well 36 MW-16 64 0 to 4444 to 64 B 42 to 64 40 to 42 0 to 40 GWM Well 37 MW-17 65 0 to 45 45 to 65 B 43 to 65 41 to 43 0 to 41 GWM Well 38 MW-18 50 --5-to 30 30 to 50 A 28 to 50 26 to 28 Oto 26 GWM Well 39 MW-18D 66 0 to 61 61 to 66 B 60 to 66 57 to 60 0 to 57 GWM WeII 40 MW-19D 66 0 to 61 61 to 66 1 B 60 to 66 58 to 66 0 to 58 GWM Well 41 MW-21D 66 0to61 61to66 B 60to66 58to66 0to59 GWM Well 42 MW-21S 49 oto29 29to49 A 27to49 25to27 0to25 GWM Well 43 MW-22D 66 0 to 61 61 to 66 B 59 to 66 56 to 59 0 to 56 GWM Well 44 MW-22S 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 GWM Well 45 MW-24D 103 -0to 98 98 to 103 D 98 to 103 90 to 98 0 to 81 GWM Well 46 MW-24-5 90 0 to 85 85 to 90 C --FT,90 81 to 83 0 to 81 GWM Well 47 MW-27 65 0 to 45 45 to 65 B 43 to 65 40 to 43 0 to 40 GWM Well 48 MW-28 70 0 to 50 50 to 70 B 445 to 70 42.5 to 44.5 0 to 42.5 GWM Well 49 M W-29 70 0 to 50 50 to 7O B 44.7 to 70 42.4 to 44.7 0 l0 42.4 GWM Well 50 MW-30 70 0 to 50 50 to 70 B 42 to 70 40 to 42 0 to 42 GWM Well 51 MW-31 103 0 to 98 98 to 103 D 98 to 103 94 to 97 0 to 94 GWM Well 52 MW-32 90 0 to 85 85 to 90 C 84 to 90 81 to 84 0 to 81 GWM Well 53 MW-19S 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 GWM/AS Well 54 MW-23D 102.5 0 to 97.5 975 to 102.5 D 975 to 102.5 91 to 97.5 0 to 83 GWM/AS Well 55 MW-23S 91 0 to 86 86 to 91 C 85.5 to 91 83 to 85.5 O to 83 GWM/AS Well 56 MW-25D 66 0 to 61 61 to 66 B 59 to 66 55 to 59 0 to 55 GWM/AS WeII 57 MW-25S 45 0 to 25 25 to 45 A 23 to 45 20 to 23 0 to 20 GWM/AS Well 58 SP-1A 20 NA 18 to 20 -- 16.5 to 2025 145 to 16.5 oto 14.5 Soil Vapor Probe 59 SP-16 35 NA 33 to 35 A 31.5 to 35.25 29.5 to 31.5 0 to 29.5 Soil Vapor Probe 60 SP-2 25 NA 23 to 25 -- 2L5 to 25.25 19.5 to 21.5 0 to 19.5 Soil Vapor Probe 61 SP-3 25 NA 23 to 25 -- 22 to 25.25 19.5 to 22 O to 19.5 Soil Vapor Probe 62 SP-4 25 NA 23 to 25 -- 215 to 25.25 19.5 to 21.5 0 to 19.5 Soil Vapor Probe 60191388 2 of 3 AECOM