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' Table 1 Well Construction Details ' Former Unocal Station No 5098 • 5400 and 5606 Pacific Avenue Stockton, California Well Depth to Blank Screened Hydrostratigraphic Sand Bentonite Gemerttl Number Bottom Casing Interval Unit Pack Seal Grout tbs tbs tbs tbs bs tbs a or Extraction and Combination Wells VEW-1A 26 0 to 10 10 to 25 -- 8 to 26 6 to 8 0 to 6 VEW-1 B 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 IVEW-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 31 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 0 to 54 5 54 5 to 59 5 B 53 to 59 5 46 5 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 W-9 60 Oto 10 10 to 30 -- 95to31 7to95 Oto? 0 to 54 5 54 5 to 59 5 B 53 to 59 5 47 25 to 53 VEW-10 j 60 0to10 10 to 30 -- 9to31 75to9 Oto 75 0 to 54 5 54 5 to 59 5 B 52 to 59 5 48 to 52 VEW-11 60 0 to 10 10 to 30 -- 9 to 31 7 to 9 0 to 7 0to545 545to595 B 525to595 475to525 VEW-12 60 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 53 VEW-13 60 0 to 15 15 to 30 -- 14 to 31 11 to 14 Oto 11 0 to 55 55 to 60 B 52 to 60 47 to 52 f OTES gs = below ground surface Hydrostratigraphic Units screened approximately as follows eA=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 ' 06940-293 2 of 2 ENSR Corporation