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Environmental Risk Servi Corporation Boring Log: MW-15D,P,S Date: 5/10/06 Logged by: Tyson Fulmer Well Specifications Location: Roberts No. 1, Roberts Island, Port of Stockton Elevation Drilling Co.: Resonant Sonic Inc GS: --- TOC: --- Driller: Jose Gutierrez Depth to Water Drilling Method: 8" hollow stem auger Static: D: 14.01 P: 14.98'; S: 14.86' Grout Materials and Method: Bentonite and Tremie grouted bentonite neat cement slurry Total Well Depth: D: 15'; P:22.6; S: 30' Well Sand Type: 2/12 Monterrey sand Lat..- --- Long.: --- Completion: Flush mounted in traffic rated Christy Box PVC Diameter: 2" SCH 40' Groundwater Sampling Method: No samples Screen Interval: D:10-15';P:17.5-225;5:25-30 Soil Sampling Method: 2'split spoon (P=push) Screen Slot Size: 0.010" to a y ani m w > �, y L o, Well Well Well a >a v 3 Cn caa Detail Detail Detail o O g X, m to D 0 Material Description W-15D W-15P W-15S Remarks 2.5y 4/4 olive brown,fine to medium grained sand,70% 1 sand,loose,25-30%fines(silt),non plastic,damp 2- 3— 8 9 SP 4 10 11 Change in color to dark olive brown 2.5y 3/3,increase 5 7 in silt(fines),50%sand,medium to coarse grained, 6 7 50%silt,little traces of gravel(well rounded),quartz 7 9 8 5 6 9 7 Change in color to dark brown 10yr 3/3,mottle, 8 damp-moist 10- 6 11 s SM 10yr 6/2 brownish grey poorly graded sand medium 12 9 grained,some fines present from 11.5 to 12 feet,moist 13 5 7 14 8 9 15 CIL `' 10yr 4/2 dark brownish grey clay,low to medium plasticity 16 PTS Black,interlayered peat and clay,clay has moderate CIL stiffness 17 18- 5 5 19— 5 2.5y 2.5/1 Black peat,some clay,moist to wet,highly 5 PT __ organic 20- 7 -- 21 6 6 22 6 - 23 4 — 5 1 Gley 3/1 Dark greenish grey clay,stiff,low plasticity 24 5 5 25- 5 26 5 1 gley 4/1 dark greenish grey silty sand,increases in 7 sand content at 26.5 feet bgs,wet 27 7 28- 4 4 10 Gley 3/1 Dark greenish grey poorly sorted clean sand 29 5 quartz rich,little to no fines,wet 7 30