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 Hydra Sand Bentonite Cementt Line Well Bottom Casing Interval stratigraphic Pack Seal Grout Number Number (B bgs) (ft bgs) (ft bgs) Unit (ft bgs) (ft bgs) (D bgs) Well Type 63 SP-5 25 NA 23 to 25 -- 21.5 to 25.25 19.5 to 21.5 0 to 19.5 Soil Vapor Probe 64 SP-6 25 NA 23 to 25 - 21.5 to 25.25 19.5 to 21.5 0 to 19.5 Soil Vapor Probe 65 SP-7A 20 NA 18 to 20 -- 16.5 to 20.25 14.5 to 16.5 0 to 14.5 Soil Vapor Probe 66 SP-7B 65 NA 33 to35 A 31.5 to 35.25 29.5 to 31.5 0 to 29.5 Soil Vapor Probe 67 SP-8 45 NA 33 to 35 A 31.5 to 35.25 29.5 to 31.5 0 to 29.5 Soil Vapor Probe 68 SV-1 6 NA 5.25 to 5.75 -- 5 to 6 l to 4(hydrated) 0 to I Soil Vapor Probe 4 to 5(dry) 69 SV-2 6 NA 5.25 to 5.75 -- 5 to 6 1 to 4(hydrated) 0 to l Soil Vapor Probe 4 to 5(dry) 70 SV-3 6 NA 5.25 to 5.75 -- 5 to 6 1 to 4(hydrated) 0 to I Soil Vapor Probe _ 4 to 5(dry) 71 VEW-IA 26 Oto 10 10 to 25 8t 26 6to8 0to6 VE Well 72 VEW-2A 36 0 to 15 15 to 35 A 13 to 36 10 to 13 0 to 10 VE Well 73 VEW-3 51 0 to 20 20 to 30 A 16 to 30 16 to 18 0 to 16 VE Well 30 to 40 40 to 50 38 to 51 31 to 38 74 VEW4 51 Oto 20 20 to 30 A 18 to 31 16 to 18 Oto 16 VE Well 30 to 40 40 to 50 38 to 51 31 to 38 75 VEW-5 51 0to20 20to30 AD I8to31 16to18 0to16 VE Well 30 to 40 40 to 50 38 to 51 31 to 38 76 VEW-6A 31 Oto 10 10 to 30 A 9t 31 7to9 0to7 VE Well 77 VEW-7A 31 Oto 10 10 to 30 A 9t 31 7to9 0to7 VE Well 78 VEW-8A 31 Oto 10 10 to 30 A 9t 31 7to9 0to7 VE Well 79 VEW-9A 31 Oto 10 10 to 30 A 9.5 to 31 7t 9.5 0to7 VE Well 80 VEW-10A 31 Oto 10 10 to 30 A 9t 31 7.5 to Oto 7.5 VE Well 81 VEW-11A 31 Oto 10 10 to 30 A 9t 31 7to9 0to7 VE Well 82 VEW-12A 31 Oto 10 10 to 30 A 9t 31 6to9 0to6 VE Well 83 VEW-13A 31 Oto 15 15 to 30 A 14 to 31 11 to 14 Oto 11 VE Well 84 VEW-16 26.5 0 to 15 15 to 25 -- 12 to 26.5 9.5 to 12 1 to 9.5 VE Well 85 VEW-19 28.4 0 to 17 l7[0 27 A 11 to 28.4 9 to 11 1 to 9 VE Well 86 VEW-22 28.8 ll to 17 17 to 27 A 14 to 28.8 11 to 14 1 to 11 VE Well EXPLANATIONS: Well details were compiled from previous reports and construction diagrams prepared by EAI,ERI,JHK,KEI,ENSR,ADS *bgs=below ground surface NA = Not applicable ' Borehole below sand pack sealed with bentonite chips. Hydrostratigraphic units: A=25 to 45 feet bgs B=45 to 65 feet bgs C=85 to 90 feet bgs D=97 to 103 feet bgs 60191388 3 of 3 AECOM