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 Interval stratigraphic Pack Seal Grout Number Number (ft bgs) (ft bgs) (ft bgs) Unit (ft bgs) In bgs) (ft bgs) Well Type 1 AS-14 72 0 to 69 69 to 71 B 68 to 72 65 to 68 0 to 65 AS Well 2 AS-15 75 0 to 70 70 to 72 B 69 to 73 1 66 to 69 0 to 66 AS Well 3 AS-17 75 0 to 70.5 70.5 to 72.5 B 69.5 to 75 66.5 to 69.5 0 to 66.5 AS Well 4 AS-18 71.5 0 to 60 60 to 62 B 58 to 63 1 55 to 58 0 to 58 AS Well 5 AS-20 110 0 to 102 102 to 104 D 101 to 105 1 98 to 101 0 to 98 AS Well 6 AS-21 105 0 to 102 102 to 104 D 100.5 to 105 96 to 100.5 0 to 96 AS Well 7 AS-33 91 0 to 85 85 to 90 C 83 to 91 81 to 83 0 to 81 AS Well 8 VEW-113 66 Oto 25 25 to 40 A 23 to 41 21 to 23 Oto 21 AS Well 40 to 64 64 to 65 B 62 to 66 41 to 62 9 VEW-213 51 0 to 35 35 to 50 A 33 to 51 31 to 33 0 to 31 AS Well 10 VEW-6B 60 Oto 55 55 to 60 B 9 t 31 7to9 0to7 AS Well 35 to 47 31to 35 53 to 60 47 to 53 11 VEW-713 60 0 to 54.5 54.5 to 59.5 B 9 to 31 7 to 9 O to 7 AS Well 35 to 46.5 31 to 35 53 to 60 46.5 to 53 12 VEW-8B 60 O to 54.5 54.5 to 59.5 B 9 to 31 7 to 9 O to 7 AS Well 35 to 47 31 to 35 52 to 60 47 to 52 13 VEW-913 60 0 to 54.5 54.5 to 59.5 B 9.5 to 31 7 to 9 0 to 7 AS Well 35 to 47.25 31 to 35 53 to 60 47.25 to 53 14 VEW-IOB 60 0 to 54.5 54.5 to 59.5 B 9 to 31 7.5 to 9 0 to 7.5 AS Well 35 to 48 31 to 35 52 48 to 52 IS VEW-IIB 60 Oto 54.5 54.8 to 59.5 B 9 t 311 7to9 Oto? AS Well 35 to 47.5 31 to 35 52.5 to 59.5 47.5 to 52.5 16 VEW-12B 60 Oto 55 55 to 60 B 9 t 31 6to9 0to8 AS Well 34 to 48 31 to 34 53 to 60 48 to 53 17 VEW-13B 60 0 to 55 55 to 60 B 14 to 31 I1 to 14 0 to 6 AS Well 35 to 47 31 to 35 52 to 60 47 to 52 18 AS-26 70 0 to 65 65 to 70 B 63 to 70 59 to 63 0 to 59 AS/GWM Well 19 MW-1 68 0 to 48 48 to 68 B 43 to 68 40.7 to 43 0 to 40.7 GWM Well 20 MW-2 68 0 to 48.5 48.5 to 68.5 B 43 to 68 41.5 to 43 0 to 41.5 GWM Well 21 MW-367 0 to 47 47 to 67 B 45 to 67 43 to 45 0 to 43 GWM Well 22 MW-4 68 0 to 48 48 to 68 B 46 to 68 44 to 46 0 to 44 GWM Well 23 MW-5 68 0 to 48 48 to 68 B 46 to 68 44 to 46 0 to 44 GWM Well 60191388 1 of 3 AECOM