ARCHIVED REPORTS_SEMI ANNUAL GROUNDWATER MONITORING OCTOBER 2010

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Table 1 Well Construction Details Chevron Facility#306620 (Former Unocal #5098) 5606 Pacific Avenue Stockton, California Well tkpth;to Blank: ScreenedHydrostradiraphic . Sand bentonite Cement/ Ntmt6er $ottom Casing Interval Unit;: Pack Sea[ Grout 16 s) tbs tbs) L . bJ bs) Groundwater Monitorin Wells(cont) M W-3 I 103 0 to 98 98 to 103 D 98 to 103 94 to 97 0 to 94 MW-32 90 0 to 85 85 to 90 C 84 to 90 81 to 84 0 to 8I Combination Wells(Groundwater Monitoring/Air Spa ing) MW-19S 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-23S 91 0 to 86 86 to 91 C 85.5 to 91 83 to 85.5 0 to 83 MW-23D 102.5 0 to 97.5 97.5 to 102.5 D 97.5 to 102.5 91 to 97.5 0 to 83 MW-25S 45 0 to 25 25 to 45 A 23 to 45 20 to 23 0 to 20 MW-25D66 0 to 61 61 to 66 B 59 to 66 55 to 59 0 to 55 AS-26 77 0 to 65 65 to 70 B 63 to 70 59 to 63 0 to 59 Vapor Extraction Wells VEW-1AMo2 Oto 10 10 to 25 -- Sto26 6to8 Oto6 VEW-2A 0 to 15 15 to 35 A 13 to 36 10 to 13 0 to 10 VEW-3A 0 to 20 20 to 30 -- 18 to 31 16 to 18 0 to 16 VEW-4A0 to 20 20 to 30 -- 18 to 31 l6 to 18 0 to 16 VEW-5A0 to 20 20 to 30 -- 18 to 31 16 to 18 0 to 16 VEW-6A0 to 10 10 to 30 7 to 9 0 to 7 VEW-7A0 to 10 10 to 30 7 to 9 0 to 7 VEW-8A0 to 10 10 to 30 7 to 9 0 to 7 VEW-9A0 to 10 10 to 3031 7 to 9.5 0[0 7 VEW-10A. Oto IO 7.Sto9 Oto 7.5 VEW-11AOto 10 IO to 30 -- 9to31 7to9 Oto? VEW-12A0 to 10 10 to 30 -- 9 to 31 6[0 9 0 to 6 VEW-13A0 to 15 IS to 30 -- 14 to 31 11 to 14 0to 1I VEW-16 0 to 15 15 to 25 -- 12 to 26.59.5[0 12Ito 9.5 VEW-19 0 to 17 17 to 27 -- 11 to 28.4 9 to 11 1 o .VEW-22 0 to 17 17 to 27 -- 14 to 28.8 11 to 14 1 to 11 Air S ar a Wells VEW-1 B 66 0 to 25 25 to 40 A 23 to 41 21 to 23 0 to 21 40[0 64 64 to 65 B 62 to 66 41 to 62 VEW-2B 51 0 to 35 35 to 50 A 33 to 51 31 to 33 0 to 31 VEW-3B 51 30 to 40 40 to 50 A 38 to 51 31 to 38