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P TABLE 4 Fi WELL CONSTRUCTION DETAILS Wards and Unocal Wells c Unocal Wells Y GROUND WATER MONITORING WELLS 2 of2 Well Depth to Blank 1 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-10 70 0 to 50 1 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 MW_11 72.5 0 to 52.5 52.5 to 72.5 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 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 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 MW-18 50 D to 30 30 to 50 2$ to 50 26 to 28 0 to 26 MW-19S 50 0 to 30 30 to 50 28 to 50 26 to 28 0 to 26 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 NOTES: *bgs-below ground surface F} 4-backfilled with bentonte chips from 35 feet to bottom before setting the screened interval Ell C1 Fs F f N.7MMELLDECAZL ENVIRONMENTAL AUDIT,INC.