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TABLE 4 WELL CONSTRUCTION DETAILS Wards and Unocal Wells Unocal Wells GROUND WATER MONITORING WELLS 2 of Well Depth to Blank Screened Sand Bentonite Cement/ Number Bottom Casing Interval Pack Seal Grout (in feet bgs*) (in feet bgs) (in feet bgs) (in feet bgs) (in feet bgs) (in feet bgs) MW-1(} 70 0 to 50 50 to 70 48 to 70 48 to 50 0 to 48 MW-10A 51.5 0 to 30 30 to 50 28 to 50 26 to 28 0 to 26 k� MW-11 72.5 0 to 52,5 52.5 to 72.5 11 50.5 to 72.5 46 to 48 ? 0 to 46 MW-12 71 0 to 51 51 to 71 49 to 71 47 to 49 0 to 47 MW-13 68 0 to 48 48 to 68 46 to 68 44 to 46 0 to 44 y MW-14 69 0 to 49 49 to 69 47 to 69 45 to 69 0 to 45 MW-14A 50 0 to 30 30 to 50 28 to 50 26 to 28 0 to 26 MW-15 69 0 to 49 49 to 69 47 to 69 45 to 69 0 to 45 Fi MW-16 64 0 to 44 44 to 64 42 to 64 40 to 42 0 to 40 MW-17 65 0 to 45 45 to 65 43 to 65 41 to 43 0 to 41 1 MW-18 50 0 to 30 30 to 50 28 to 50 26 to 28 0 to 26 MW-18D 66 0 to 61 61 to 66 60 to 66 57 to 60 0 to 57 MW-19S 50 0 to 30 30 to 50 28 to 50 26 to 28 0 to 26 t MW-19D 66 0 to 61 61 to 66 60 to 66 58 to 66 0 to 58 MW-21S 49 0 to 29 29 to 49 27 to 49 25 to 27 0 to 25 MW-21D 66 0 to 61 61 to 66 60 to 66 58 to 66 0 to 58 MW-22S 50 0 to 30 30 to 50 28 to 50 26 to 28 0 to 26 MW-22D 66 0 to 61 61 to 66 59 to 66 56 to 59 0 to 56 MW-23S 91 0 to 86 86 to 91 85.5 to 91 83 to 85.5 0 to 83 MW-23D 102.5 0 to 97.5 97.5 to 102.5 97.5 to 102.5 91 to 97.5 0 to 83 F" MW-24S 90 0 to 85 85 to 90 83 to 90 81 to 83 0 to 81 MW-24D 103 0 to 98 98 to 103 98 to 103 90 to 98 0 to 81 Ft MW-25S 1 45 0 to 25 25 to 45 23 to 45 20 to 23 0 to 20 MW-25D 66 0 to 61 61 to 66 59 to 66 55 to 59 0 to 55 NOTES: *bgs-below ground surface backfilled with bentonte chips from 35 feet to bottom before setting the screened interval F � 11 41 N:I272:WELLDE]'AIL ENVIRONMENTA L A UDI T,INC. R � I