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r TABLE 5 WELL CONSTRUCTION DETAILS Wards and Unocal Wells VAPOR EXTRACTION AND COMBINATION WELLS WeH-1 Depth to Blank Screened Hydrostratigraphic Sand Bentonite Cement/ Number Bottom Casing Interval Unit Pack Seal Grout ' (m feet bgs*) (in feet bgs) (in feet bgs) -- (in feet bgs) (in feet bgs) (in feet bgs) VEW-lA 26 0 to 10 10 to 25 8 to 26 b to 8 0 to 6 VEW-1$ 66 0 to 25 25 to 40 A 23 to 41 21 to 23 0 to 21 ' 40 to 64 64 to 65 B 62 to 66 1 41 to 62 VEW-2 36 0 to 15 15 to 35 A 13 to 36 10 to 13 0 to 10 VEW-2B 51 0 to 35 35 to 50 A 33 to 51 31 to 33 0 to 31 VEW-3 51 0 to 20 20 to 30 -- 18 to 31 16 to 18 0 to 16 30 to 40 40 to 50 A 38 to 51 31 to 38 VEW-4 51 0 to 20 20 to 30 -- 18 to 3 1 16 to 18 0 to 16 30 to 40 40 to 50 A 38 to 51 31 to 38 VEW-5 51 0 to 20 20 to 30 18 to 31 --16 to 18 0 to 16 30 to 40 40 to 50 A 38 to 51 31 to 38 VEW-6 60 0 to 10 10 to 30 -- 9 to 31 7 to 9 0 to 7 0 to 55 55 to 60 B 53 to 60 47 to 53 VEW-7 60 0 to 10 10 to 30 -- 9 to 31 7 to 9 0 to 7 0to545 545to595 B 53 to 595 465 to 53 VEW-8 60 0 to 10 10 to 30 -- 9 to 31 7 to 9 0 to 7 0to545 545to595 B 52 to 595 47 to 52 VEW-9 60 0 to 10 10 to 30 -- 9 5 to 31 7 to 9 5 0 to 7 Oto 545 545to595 B 53 to 595 4725 to 53 VEW-10 60 Oto 10 10 to 30 9to31 75to9 0to75 Oto 545 545to595 B 521o595 48 to 52 VEW-1 1 60 0 to 10 10 to 30 -- 9 to 31 7 to 9 0 to 7 0to545 545to595 B 525to595 475to525 VFW-1260 0 to 10 10 to 30 -- 9 to 31 6 to 9 0 to 6 0 to 55 55 to 60 B 53 to 60 48 to S VFW-13 60 0 to 15 15 to 30 14 to 31 I 1 to 14 0 to 1 1 0 to 55 55 to 60 B 52 to 60 47 to 52 NOTES *bgs -below ground surface I-iydrostrattgraphic Units screened approximately as follows A =25 to 45 feet below grade surface(bgs) B =45 to 65 feet bgs C=85 to 90 feet bgs D–97 to 103 feet bgs Screened above the upper hydrostratlgraphic unit r r i r N 1212 WELLDETAIL Page 2 of 2 FAIVIRONMENTAL AUDIT INC r