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Table 4 DRAFT Well Construction Data for Selected Wells Located in the Study Area Lincoln Center, Stockton, California Estimated Top-of-Casing Depth of Screened Filter Pack Seal Date Drilling Subcontractor/ Screened t Boring Diameter Elevations Casing Screen Diameter Boring Interval Interval Interval Well ID Installed Consultant Geologic Unit (inches) (feet MSL) Material (inches) (feet bgs) (feel bgs) (feet bgs) (feet bgs) California Water Service(CWS)Wells CWS-54 - - - - Steel 12 232 176-226 none none CWS-55 1949 Clark Well Drilling - - - Steel 14 232 40-232 non 171 - 178 190-219 CWS-56 6/24/53 Clark Well Drilling - - - Steel 12 260 236-248 none 0-25 38(from 0'to 78') CWS-57 10/5/56 Western Well Drilling - 30(from 78'to 510'1 - Steel 16 527 154-490 none 0-78 36(from 0'to 80') CWS-61 2/18/61 Western Well Drilling - 30(from 80'to 5107 - Steel 16 524 170-500 none 0-50 Lincoln Center Monitoring Wells MW-1 5/24/88 PC Exploration/LH A zone 12.75 11.14 Sch.40 PVC 4.5 60 43-58 40-60 0-40 MW-2 5/27/88 PC Exploration/LH A zone 12.75 10.23 Sch.40 PVC 4.5 60 43-58 40-60 0-40 MW-3 5/25/88 PC Exploration/LH A zone 12.75 12.54 Sch.40 PVC 4.5 60 43-58 40-60 0-40 MW4 5/31/88 PC Exploration/LH A zone 12.75 11.02 Sch.40 PVC 4.5 70 55-70 52-70 0-52 MW-5 9/24/90 PC Exploration/K)C A zone 10 9.56 Sch.40 PVC 4 64 41 -61 39.5-59.5 0-39.5 MW-6 9/19/90 PC Exploration/KJC A zone 10 10.38 Sch.40 PVC 4 70.5 41.5-61.5 40-64 0-40 MW-7 10/22/90 PC Exploration/KJC A zone 10 11.21 Sch.40 PVCI 4 71 50-70 1 48.5-71 0-484-48 MW-8 9/26190 PC Exploration/K)C A zone t0 11.84 Sch.40 PVC 4 70 49-69 47.5-69 0-47.5 MW-9 10/15/90 PC Exploration/KIC A zone 10 10.46 Sch.40 PVC 4 76.5 50-70 48-71 0-48.5 MW-10 9/17/90 PC Exploration/KIC A zone 10 12.34 Sch.40 PVC 4 75 44-64 43-63.5 0-43 MW-11 10/17/90 PC Exploration/KJC A zone 10 11.73 Sch.40 PVC 4 76.5 50-70 49-73 0-49 MW-12 10/1/90 PC Exploration/KIC A zone 10 10.59 Steel 6 77 50-70 48-72 0-48 MW-20 11/2/90 PC Exploration/KIC A zone 12 11.25 Steel 6 140 110-130 105-140 1 0- 10 MW-21 10/29/90 PC Exploration/KJC A zone 12 10.68 1 Steel 1 6 117 97- 117 1 94-150 0-94 MW-30 11/15/90 PC Exploration/KJC A zone 12 11.14 Steel 6 280 210-250 175-275 0-175 MW-100 10/31/96 Spectrum/LFR A zone 10 11.14Steel 4 63.5 43.5-63 5 37.5-63-5 0-37.5 MW-101 11/14/96 Spectrum/LFR Azone 10.25 12.34 Steel 4 75.5 49-75.5 1 47-75.5 0-47 3966MWALS/Sheetl 2 of 4 3/13/97-