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MW <br /> Monitoring Well MW-4 <br /> project Chevron/S. Center Owner Chevron U.S.A. . Inc. Drilling Log <br /> Location 139 S. Center, Stockton, CA project Number. 203 175 3291.01 <br /> Date Drilled 2/19/91 Total Depth of Hole 60.0 ft. Diameter 8.25 in- See Sfte Atap <br /> Surface Elevation Nater Level Initial 49.0 ft. _ 24-hour 44.87 ft. For Boring Location <br /> Screen Dia 2.0 in. Length 25.0 ft. Slot Size 0.020 in. NOTES_ <br /> Casing: Oia 2.0 in. Length 35.0 ft. Type SCH 40 PVC <br /> Filter Pack Material 02/12 Laois Lustre <br /> Drilling Company Sierra Pacific Exol. Drilling Method hollow Stem Auger <br /> Driller .bhnny Arouello Log by Fred Hayden <br /> Geologist/Engineer Allen B. Storm License No AG 4394 <br /> a o Description <br /> (Color. Texture, Structure) <br /> U N m N <br /> 0 Three inches ASPHALT <br /> •:•o•:"o•:•o fine inches BASE course <br /> ark grey CLAY (medium Stiff, damp, no hydrocarbon odor) <br /> 2 <br /> io CL <br /> 4 35 Moderate brown silty CLAY (medium stiff, damp, <br /> MW4-5 25 no hydrocarbon odor) <br /> Dark yellowish brown silty CLAY (stiff, damp, <br /> 6 no hydrocarbon odor) <br /> Night olive grey clayey SILT (medium stiff, damp, <br /> no hydrocarbon odor) <br /> 8 ML <br /> 12 <br /> 20 Light brown sandy CLAY (soft, damp, no hydrocarbon odor) <br /> 10 I MW4-10 35 <br /> CL <br /> Light brown clayey SILT (stiff, damp, no hydrocarbon odor) <br /> 12 — <br /> 14 30 <br /> 20 <br /> MW4-15 50 ML <br /> 16 <br /> Moderate yellowish brown clayey SAND with silt (soft, damp, <br /> 18 C C no hydrocarbon odor) <br /> 10 <br /> 15 <br /> MW4-20 30 SC <br /> Tan silty CLAY with sand (soft, damp, no hydrocarbon odor) <br /> 24 25 CL <br /> MW4-2527 <br /> 26 <br /> OV2611991 Page 1 of 3 <br />