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TABLE 2 WELL CONSTRUCTION DETAILS Wards and Unocal Welts VAPOR EXTRACTION AND COMBINATION WELLS Well Depth to Blank Screened Hydrostratigraphlc Sand Bentonite Cement/ Number Bottom Casing Interval Unit Pack Seal Grout (in feet bgs*) (in feet bgs) (in feet b s) -- (In feet bgs) (in feet bgs) (in feet bgs) VEW-lA 26 0 to 10 10 to 25 8 to 26 6 to 8 0 to 6 VEW-1B 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 41 to 62 VEW-2 36 0 to 15 15 to 35 A 13 to 36 10 to 13 0 to 10 VEW-213 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 31 I6 to 18 0 to 16 30 to 40 40to50 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 Oto545 545to595 B 53 to 595 465 to 53 VEW-8 60 Oto 10 10 to 30 -- 9to31 7to9 Oto ? 0to545 545to595 B 52 to 595 47to52 VEW-9 60 0 to 10 10 to 30 9 5 to 31 7 to 9 5 0 to 7 0 to 54 5 54 5 to 59 5 B 53 to 59 5 47 25 to 53 VEW-10 60 Oto 10 10 to 30 -- 9to31 75to9 0to75 Oto 545 545to595 B 52 to 595 48to52 VEW-11 60 Oto 10 10 to 30 -- 9to31 7to9 Oto? Oto 545 545to595 B 525 to 595 475to525 VEW-12 60 Oto 10 10 to 30 9to31 6to9 0to6 0 to 55 55 to 60 B 53 to 60 48 to 53 VEW-I3 60 0 to 1515 to 30 -- 14 to 31 11 to 14 0 to 1 I 0o 55 55 to 60 B 52 to 60 47 to 52 NOTES *bgs -below ground surface Hydrostratlgraphic 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 hydrostratigraphic unit N 1232 WELLDETAIL Page 2 of 2 ENVIRONMENTAL AUDIT,INC