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i <br /> Project: ARCO Station #5450 Log of Monitoring Well: <br /> Location: 1617 Fremont Ave.,Stockton,CA Project Number: 38465965 <br /> MW-4 <br /> ' Dates Drilled: 8128102 Total Depth Drilled: 23.5 ft bgs <br /> Logged By: S.Lookingbill <br /> Drilling Contractor: PC Exploration P Borehole Diameter. 8-inch Checked By: V.Elarih <br /> ' 'Rig Type' B-40 Well Construction Dates: 8/28/02 <br /> Screen Slot Size: 0.010-inch <br /> Drilling Method: Hollow Stem Auger Well Diameter: 2-inch <br /> Drill Bit: 8-inch Hollow Stem Auger Type of Well Casing: SCH 40 PVC <br /> Comments: <br /> Y � 3 3 <br /> a � 00 <br /> �s <br /> 4 LITHOLOGY DESCRIP'T'ION <br /> p 'WELL CONSTRUCTION <br /> ' — Aggregate Base Flush Mount Christy Box 0 <br /> Sandy Clay(CL). Yellow brown,medium <br /> plasticity,trace fine to medium sand,trace 2-inch SCH 40 PVC with <br /> grave],moist no odor- locking pressure cap to 8'bgs <br /> Neat Cement to Y bgs <br /> ' 5 0.0 19 Clay(CL). Yellow brown,iron oxide staining, <br /> staff,moist,no odor. 5 <br /> 5-7'Bentonite Sea] <br /> I <br /> 10 <br /> 0.0 28 Clay(CL). Yellow brown,iron oxide staining, 10 <br /> stiff,trace gravel,moist,no odor. <br /> Clay(CH). Yellow brown,high plasticity, 8-23'2-incb SCH 40 PVC, <br /> medium stiff,trace gravel,moist,no odor_ 0.070-inch Slot Screen, Filter <br /> Pack#2/12 Sand <br /> 15 0.0 13 <br /> 15 <br /> Sandy Clay(CL). Yellow brown,minor iron <br /> 20 0 0 29 oxide staining,very fine to fine sand,trace <br /> gavel,saturated. 20 <br /> I <br /> Total Depth of Boring 23.5' <br /> bgs <br /> 2870raGat—Ay Oaks rh.-Sm 300 <br /> Sw tcnto,CA 95833 <br /> 9H�679-2000 <br />