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LrMOLOGIC DESCRIPTION MONITORING WELL LOG Well I.D.: MW-4 Date( ) of Drillings : 7114192 Location NE of Former Tank Area Client San Joaquin County Drilled Depth: 71 feet Mosquito Abatement District Hole Diameter 8 inches Project No 06778-001-001 Contractor: West Hazmat Well Construction Details: Driller Gene Rheinholt Drilling Method Hollow Stem Auger (HSA) Well Depth 70 feet Well Diameter 4 inches Decon Method Steam-cleaning Casing Type Schedule 40 PVC Sampling Continuous Core Barrel and Screen Type- Schedule 40 PVC Split-spoons at 10-foot intervals Screen Interval 50 to 70 feet Screen Slot 0 02 inch ' Elevation - Feet (MSL): Materials: Ground surf Not measured Sand Pack Lonestar #1C Casing top 5443 Grout 3-5% bentonite/cement grout Completion Type Flush Christy Box Geologist: D Marks Cap Expandable Locking MW-4 Depth Interval Blow HNu feet BGS Counts USCS Symbol'/Description Remarks Value 0 -3 SM SAND (Fill) medium brown gray, very fine to coarse, loosely consolidated, silty, poorly sorted, dry, no apparent odor, no apparent staining, 75% sand, 15% silt, 10% clay 3 - 115 6, 6, 12 SM SAND medium reddish brown, very fine to fine, loosely <1 consolidated, moist, no apparent odor, no apparent staining, moderate to highly dilatency, no dry strength, 85% sand, 15% silt 115 - 17 SC-SM SAND medium reddish brown, moist to slightly wet, wet from 12 to 13 feet, clayey, very fine to medium, occasional ' pebbles,poorly sorted, subangular to well-rounded, loosely consolidated, no apparent odor, no apparent staining, slight dry strength, no dilatency, 80% sand, 10% clay, 10% silt 17 - 19 CL CLAY medium reddish brown to grayish brown, dry to slightly moist, firm, blocky, high dry strength, no dilatency, no apparent odor, no apparent staining, laminat- ed with dark carbonaceous material, 85% clay, 15% silt 1 Unified Soils Classification System snccutrrsssrcMAn wr A - 7 10/12/92