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f <br /> t <br /> Project: ARCO Station # 2168 Log of Monitoring Well: <br /> Location: 441 West Charter Way,Stockton,CA Project Number: 38466562 MW-12 <br /> Drilling Contractor: Woodward Drilling Drilling Method: Hollow Stem Auger Borehole Name: MW-12 <br /> Dates Drilled: 11/15/05 Well Construction Date: 11/15/05 Logged By: Scott Lookingbill,R.G. <br /> Borehole Diameter: 8-inch Casing Diameter: 2-inch Type: SCH 40 PVC Checked By: Vern Elarth,R.G. <br /> Total Depth Drilled: 32.5 feet Screen Interval: 17-32 feet Slot Size: 0.020-inch Sampling Method: CA Modified Split Spoon <br /> Comments: <br /> a C <br /> U o <br /> R a 2 N <br /> a <br /> 2 R2 Q 8 <br /> E= <br /> Z Sample ID a' LITHOLOGY DESCRIPTION WELL CONSTRUCTION <br /> 0 <br /> Silty Clay CL Li yellowish bro 8-inch flush mount 0 <br /> � ty Y( )• Light y wn,very hard,low plasticity,no K <br /> odor,dry to damp. traffic grade vault box <br /> Well secured with 2- <br /> U inch locking pressure <br /> U <br /> cep <br /> 5 <br /> 50/5 0.0 5 <br /> Neat cement from <br /> near surface to 12 ft <br /> Silt(ML). Light yellowish brown,very hard,non plastic,no odor,dry. <br /> 10 <br /> 50/6 OA 10 <br /> Bentonite Seal <br /> 12-15 ft <br /> 15 0.0 Trace very fine grained sand. 15 <br /> -X 32 <br /> Clayey Silt(ML). Light yellowish brown,firm,low plasticity,white <br /> mottling,no odor,moist. <br /> 20 0,0 20 <br /> X18 MW-12-20 1010 <br /> Silty Clay(CL). Light olive brown,hard,medium plasticity,slight MW-12 <br /> hydrocarbon-fike odor,damp. 2-inch SCH 40 PVC, <br /> 25X1,5 0.020 inch Slot 25 <br /> 27 Screen 17-32 ft <br /> #3 Filter Pack Sand <br /> 15-32.5 ft <br /> Clayey Silt(ML). Light olive brown,trace sand,stiff,low plasticity, <br /> Clay interbeds,slight hydrocarbon-like odor,moist. <br /> 30 0.0 <br /> 20 30 <br /> �s <br /> n <br /> ie <br /> r <br /> 2870 Gateway Oaks Dr.,Ste 300 <br /> Sacramento,CA 95833 _ <br /> UN5916-679-2000 <br />