SITE INFORMATION AND CORRESPONDENCE_1997

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Well Construction Data for Selected Wells Located in the Study Area _ Lincoln Center, Stockton,California Estimated Boring Top-of- Conductor Conductor Well Drilling Screened' Diameter, Depth of Casing Casing Casing Casing Well Casing Well Casing Screen Flter Pack Filter Silt Trap Seal Date Subcontractor/ Geologic inches(depth, Boring Elevation D)ameter Depth Diameter Material, Material,Screen Interval Interval Pack Interval Interval Well ID Installed Comulfant Unit feet bgs) (feet bgs) (feet MSU (inches) (feet bgs) (inches) Blank (slot size,inches) (feet bgs) (feet bgs) Size (feet bgs) (feet bgs) Lincoln Center Monitoring Wells MW-1 5/24/88 PC Exploration/LH Azone 12.75 60 11.14 Na n/a 4.5 Sch.40 PVC Sch.40PVC A41.3-61.540-64 40-60 0-40 MW-2 5/27/88 PC Exploration/1-1-1 Azone 12.75 60 10.23 Na Na 4.5 Sch.40 PVC Sch.40 PVC 0-60 0-40 MW-3 5/25/88 PC ExploratioNLH A zone 12.75 60 12.54 Na Na 4.5 Sch.40 PVC Sch.40 PVC 0.60 0.40 MW-4 5/31/88 PC Exploration/1-1-1 Azone 12.75 70 11.02 Na Na 4.5 Sch.40PVC Sch.40PVC 2-70 0-52 MW-5 9/24/90 PC Exploration/I(JC Azone 10 64 9.56 n/ Na 4 Sch.40 PVC Sch.4 PPVC .5-59.5 0-39.5 MW-6 9/19/90 PC EzploratioNgC Azone 10 70.5 10.38 Na n/ 4 $ch.40PVC Sch.40PVC 0-640.40 MWa 10Y2250 PC ExploratioNlOC Azone 10 71 17.21 Na Na 4 Sch.40 PVC Sch.40PVC .5-77 MW6 9/26/90 PC ExplarationMJC Azone 10 70 11.58 Na Na 4 Sch40 PVC Sch40 PVC .5-69 0-47.5 MW-9 10/15/90 PC Exploratiorv%C Azone 10 76.5 10.46 Na Na 4 Sch.40 PVC Sch.40PVC 50-70 48-71 0-48.5 MW-10 9/17/90 PC Explora[IONRJC Azone 10 75 12.34 Na Na 4 97.4 PPVC Sch.40PVC 44-64 43-63.5 0-43 MW-11 1((77/90 PCExplaation80C Azone 10 76.5 11.73 Na n/ 4 Sah.40 PVC 9ch.40PVC 50-70 49-73 0.49 MW-12 10/1/90 PC Esploration/IgC Azone 10 77 10.59 Na Na 6 Steel Steel 50-70 48-]2 0.48 MW-20 11/1/90 PC Ezplaralion/KJC Azone 11 140 11.25 n/a Na 6 Steel Steel 110-130 105-140 0.105 MW-21 10/29/90 PC Exploration/RJC Azone 12 117 10.68 Na Na 6 Steel Steel 97-117 94-750 --07-94 MW-30 11/15/90 PC Explaation/I(JC Azone 12 280 11.14 Na Na 6 Steel Steel 210-250 175-275 0-175 Wells Installed by Levine-Fricke-Recon MW-100 10130/97 Spectrum/LFR Azone 10 63.5 1 11.76 Na Na 4 Sch.40 PVC Stainless Steel(0.020) 43-63 38-63.5 #3 Na 0-38 MW-101 11/13.14/9 Spectrum/Vit Azone 10 75.8 11.02 Na Na 4 Sch.40 PVC Stainless Steel!0.020) 49.75.2 47-75.8 Na 0-47 MW-102 2/18-19/97 Spectrum/LFR Azone 10 75 11.59 Na Na 4 Sch.40 PVC I Stainless Steel(0.020) 45-74.8 43-75 #2/12 Na 0-43 MW-103-8 4/29-Sa/97 Azone 12 89.5 . 9.59 Na Na 4 Sch.40 PVC Stainless Steel(0.010) 57.5.87.5 55.5-89.5 #3/72 87.5-89.5 0-55.5 MW-104A notdrilled - - - _ _ _ _ _ _ as of 9/97 - - - - - - MW-!OSA 5/45/857 Gregg Drilling/LFR Azone 10 79 10.12 Na Na 4 Sch.40 PVC Stainless Steel(0.010) 46-76 M-79 #1C 76-78 0-44 • MW-106A 4/17- Gregg Drilling/LFR Azone 12 79 11.32 nh ,V 4 5chPVC.40Stainless Steel(0.020) 57-77 55-79 #2/12 77-79 0-55 4118/97 MW-107A 4/15- Gregg DrillingILFR Azone 12 67 11.10 Na Na 4 Sch.40 PVC Stainless Steel(0.010) 45-65 43-67 #1C 65-67 0-43 4116/97 MW-108A Gregg Drilling/LFR 8/26/196/1996 Azone 10 62 1 11.44 Na Na 4 Sch.40 PVC Stainless Steel(0.010) 40-60 38-62 #IC 60-62 0-38 MW-2008 4134/4/97 Weeks Orillinr/lFR B zone 17.75(0.78); 137 11.57 70.75 79.5 4 Sch.40 PVC Stainless Steel(0.020) 111-131 109-137 #1C 731-136 0-109 9.9(78-137) MW-2018 5/6-5/857 Weeks DrillinPJLFR B zone 17.75(068); 102 11.63 10.75 69.2 4 Stainless Steel Stainless Steel(0.020) 81-96 80-102 #2/12 96-701 9.9(68-102) 0-80 MW-2038-1 5/19- Weeks Drillinr/LFR Bzone 18(0-01);12.25 129 10.68 12.75 01.9 2 Sch.40 PVC Stainless Steel(0.010) 91.5-94 90.5.95 #1C Na 0-90,5 5/30/97 (81-129) MW-2038-2 5/19- Weeks Drilling/LFR Bzone 18(0.81);12.25 129 11.21 12.75 81.9 2 Sch.40 PVC Stainless Steel(0.010) 101-111 100-113.5 #7C Na 95.100 5/30/97 (81-129) MW-2038-3 5/19- Weeks Drilling/LFR Bzone 18(0-87);12.25 129 11.33 12.75 81.9 2 SCh.40PVC Rainless Steel(0.010) 123-128 121.8-129 PC Na 113.5- 1 (81-129) 121.8 TABLE 5-well construction data/All Wells 1 of 2 12/1657