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ersEnvironmental Services,Corporation Boring Log: MW-20D/P/S <br /> 1600 Riviera Av,..,e,Suite 310 Page 1 of 1 <br /> Walnut Creek,CA 94596 <br /> 925 938.1600 <br /> Date: 8/29/2007 Logged By: Monami Datta Well Specifications <br /> Location:Roberts Number 1,Roberts Island,Stockton,CA Elevation <br /> Client:Port of Stockton GSE:5.86,5.96,5.92 TOC:5.55,5.64,5.66 <br /> ...................................................................................................................................... .................................................... <br /> Drilling...Co..:.Gregg. Drilling.................................................................................................... Depth to Water <br /> . . . ..... . <br /> Drilling Method:8"Hollow Stem Auger Driller:Bobby Initial:18 ft. Static:12 ft. <br /> ...................................................................................................................................... .................................................... <br /> Well Sand Filter:2/12 Monterey Well Seal:Bentonite Total Well Depth:29 ft. <br /> ...................................................................................................................................... .................................................... <br /> Grout Materials and Method:Neat Cement Lat.:37 58.570 Long:-12123.177 <br /> ...................................................................................................................................... .................................................... <br /> Completion:Flush mounted Christy BoxPVC Diameter:2"PVC <br /> ...................................................................................................................................... .................................................... <br /> Groundwater Sampling Method:NA Screen Interval:5-9,10-13,20-26 ft. <br /> ...................................................................................................................................... .........................I.......................... <br /> Soil Sampling Method:CA Modified SPT 24" Screen Slot Size:0.010" <br /> m <br /> 00 <br /> a m i!' n n N J <br /> a� L r Material Description Well Diagram <br /> a <br /> > <br /> a 3 — U <br /> 0 (75 <br /> o m O v°) in 0 MW-20d MW-20 MW-20s <br /> Sand(SP)10YR/4,dark yellowish brown,fine to medium grain,small to <br /> medium traces of gravel present,presence of roots and organic matter, <br /> mottling of non-plastic <br /> SP <br /> 5 <br /> Silty sand(SM),very dark yellowish brown,increase in silt content <br /> SM <br /> Clay(CL)10YR 2/2,dark grayish brown,low plasticity <br /> 10 <br /> Color change to brownish black,5YR 2/1,low plasticity <br /> Color change to very dusky red,l OR 3/4,damp,reddish coloring due to <br /> reducing environment <br /> CL Color change to dark yellowish brown,10YR 4/2,small rounded gravel <br /> present <br /> Color change to dusky yellowish brown,1 OYR 2/2,wet,high plasticity <br /> 15 <br /> Fine sand(SP)5Y 5/2,light olive gray,loose,wet <br /> 20 <br /> SP <br /> 25 <br /> Silty sand(SM)5G 4/1,dark greenish gray,25-30%non-plastic fines, <br /> wet <br /> SM <br /> Total Depth:29 ft. <br />