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TABLE 2 WELL CONSTRUCTION DETAILS Wards and Unocal Wells ' GROUND WATER MONITORING WELLS Well Depth to Blank Screened Hydrostratigraphu Sand Bentonite Cement! Number Bottom Casing Interval Unit Pack Seal Grout (in feet bgs*) (in feet b s) (in feet bis) (in feet b s) (in feet b s) (in feet b s) MW-1 68 0 to 48 48 to 68 B 43 to 68 40 7 to 43 0 to 40 7 MW-2 68 0 to 48 5 48 5 to 68 5 B 43 to 68 41 5 to 43 0 to 41 5 MW-3 67 0 to 47 47 to 67 B 45 to 67 43 to 45 0 to 43 ' MW4 68 0 to 48 48 to 68 B 46 to 68 44 to 46 0 to 44 MW-5 68 0 to 48 48 to 68 B 46 to 68 44 to 46 0 to 44 MW-6 675 Oto 475 475to675 B 455to475 435to455 Oto 435 MW-7 67 0 to 42 42 to 67 B 40 to 67 37 5 to 40 0 to 37 5 MW-81) 102 0 to 97 97 to 102 D 95 to 102 92 to 95 0 to 92 MW-9 65 0 to 45 45 to 65 B 43 to 65 40 to 43 0 to 40 MW-IO 70 0 to 50 50 to 70 B 48 to 70 48 to 50 0 to 48 MW-10A 51 5 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-11 72 5 0 to 52 5 52 5 to 72 5 B 50 5 to 72 5 46 to 48 9 0 to 46 MW-12 71 0 to 51 51 to 71 B 49 to 71 47 to 49 0 to 47 MW-13 68 0 to 48 48 to 68 B 46 to 68 44 to 46 0 to 44 MW-14 69 0 to 49 49 to 69 B 47 to 69 45 to 69 0 to 45 MW-14A 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-15 69 0 to 49 49 to 69 B 47 to 69 45 to 69 0 to 45 MW-16 64 0 to 44 44 to 64 B 42 to 64 40 to 42 0 to 40 MW-17 65 0 to 45 45 to 65 B 43 to 65 41 to 43 0 to 41 MW-18 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-18D 66 0 to 61 61 to 66 B 60 to 66 57 to 60 0 to 57 MW-19S 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-19D 66 0 to 61 61 to 66 B 60 to 66 58 to 66 0 to 58 MW-21S 49 0 to 29 29 to 49 A 27 to 49 25 to 27 0 to 25 MW-21D 66 0 to 61 61 to 66 B 60 to 66 58 to 66 0to 58 MW-22S 50 0 to 30 30 to 50 A 28 to 50 26 to 28 0 to 26 MW-22D 66 0 to 61 61 to 66 B 59 to 66 56 to 59 0 to 56 MW-23S 91 0 to 86 86 to 91 C 85 5 to 91 83 to 85 5 0 to 83 MW-23D 1025 0to975 975to 1025 D 975to 1025 91 to 975 0to83 MW-24S 90 0 to 85 85 to 90 C 83 to 90 81 to 83 0 to 81 MW-24D 103 0 to 98 98 to 103 D 98 to 103 90 to 98 0 to 81 MW-25S 45 0 to 25 25 to 45 A 23 to 45 20 to 23 0 to 20 ' MW-25D 66 0 to 61 61 to 66 B 59 to 66 55 to 59 0 to 55 AS-26 70 0 to 65 1 65 to 70 B 63 to 70 59 to 63 0 to 59 MW-27 65 0 to 45 45 to 65 B 43 to 65 40 to 43 0 to 40 N 1232 WELLDEFAIL Page l of 2