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I�I Environmental Risk Servi Corporation <br /> Boring Log: MW-13 D,PS Date: 12/20/05 Logged by: Tyson Fulmer Well Specifications <br /> Location: Roberts No. 1, Roberts Island, Port of Stockton Elevation (feet msl;d, p, s) <br /> Drilling Co.: Spectrum Exploration GS:4.04,4.05,4.11 TOC: 3.72,3.78,3.79 <br /> Driller: Sean Riley Depth to water: D: 16.32'P: 17.52';S: 18.63' <br /> Drilling Method: 8"hollow stem auger Total Well Depth: D: 17';P:33';S:50' <br /> Grout Materials and Method: Bentonite and Tremie grouted bentonite neat cement slurry D: Lat.: 37.971971 Long.:-121.381433 <br /> Well Sand Type: 2/12 Monterrey sand P: Lat.: 37.971962 Long.:-121.381421 <br /> Completion: Finished 3'above grade in stainless monument S: Lat: 37.971949 Long.:-121.381404 <br /> Groundwater Sampling Method: No samples Screen Interval: D:6-11'; P:22.5-17.5';S:35-40 <br /> Soil Sampling Method: 2'split spoon (P=push) PVC: SCH 40,2" D, 0.010"slot size <br /> rn <br /> Well Well Well <br /> a-� j a u 3 m V �� Detail Detail Detail <br /> o s WE m D 0 Material Description W-13D W-13R W-13S Remarks <br /> 1 <br /> ML 10yr 3/2 very dark, greyish brown soft silt, moist <br /> 2 10yr 4/3 brown damp-dry fine grained, medium dense, <br /> silty sand <br /> 3- <br /> 4— SM <br /> 5 4 <br /> 6 4 <br /> 5 <br /> 7 1 gley 4/1 grey, poorly sorted,sandy silt,moist <br /> small lens of black peat <br /> s <br /> 9 <br /> 10 ML <br /> 3 <br /> 11 2 <br /> 3 <br /> 12- <br /> 13— 1 — 10yr 2/1 black medium stiff peat,damp-moist <br /> 14 2 PT <br /> 15 <br /> P Very clary grey,black silty clay with peat,soft,medium <br /> 16 P dense,damp to moist <br /> 17 <br /> 0 7.5 yr 3/3 dark brown organic rich clay,medium stiff <br /> 18 1 PT/ moist <br /> 1 CL <br /> 19 <br /> 20- <br /> 21- <br /> 22- <br /> 23— <br /> 0212223 3 1 gley 5/1 greenish grey stiff clay <br /> 24 4 <br /> 526CL25- <br /> 26— <br /> CL <br /> 27- <br /> 28— 5 <br /> 8 <br /> 29 11 <br /> i <br /> 30 <br />