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TABLE 4 WELL CONSTRUCTION DETAILS Wards and Unocal Wells ' GROUND WA'T'ER MONITORING WELLS loft 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 68 0 to 48 48 to 68 43 to 68 40 7 to 43 0 to 40 7 MW-2 68 0 to 48 5 48 5 to 68 5 43 to 68 41 5 to 43 0 to 41 5 MW-3 67 0 to 47 47 to 67 45 to 67 43 to 45 0 to 43 MW-4 68 0 to 48 48 to 68 46 to 68 44 to 46 0 to 44 MW-5 68 0 to 48 48 to 68 46 to 68 44 to 46 0 to 44 MW-6 675 Oto 475 475 to 675 455to475 435to455 Oto 435 MW-7 67 0 to 42 42 to 67 40 to 67 37 5 to 40 0 to 37 5 MW-813 102 0 to 97 97 to 102 95 to 102 92 to 95 0 to 92 MW-9 65 0 to 45 45 to 65 43 to 65 40 to 43 0 to 40 MW-10 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 I MW-11 725 Oto 525 525to725 505to725 46 to 489 Oto 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 0 to 30 30 to 50 28 to 50 26 to 28 0 to 26 MW-I8D 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 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 1025 0 to 97 5 97 5 to 102 5 97 5 to 102 5 91 to 97 5 0 to 83 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 I03 90 to 98 0 to 81 MW-25S 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 AS-26 70 0 to 65 65 to 70 63 to 70 59 to 63 0 to 59 11AW-`7'7 .CC n er — rr .�rr r u v to•+.) <+.) LU UJ 43 to 6J 40 to 43 t)to 40 1 0 N 1232 wELLDETAIL ENVIRONMENTAL AUDIT,INC p