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Project: Former ARCO Station# 548 Log of Monitoring Well: <br /> Location: 1612 W.Hamer Ln.,Stockton,CA Project Number: 38466402 MW-7 <br /> ates Drilled: 12/1104 Total Depth: 40 feet Borehole Dame: MW-7 <br /> rilling Contractor: Cascade Drilling Well Construction Date: 12!1104 Logged By: Matt Farris <br /> ehole Diameter: 8-inches Casing Diameter: 2-inches Casing Type: SCH 40 PVC Checked By: Vernon Elarth,R.G. <br /> tilling Method: Hollow Stem Auger Screen Interval: 25-40 ft. Slot Size: 0.020-inch Sampling Method: CA Modified Split spoon <br /> Comments: Located in parking lane on E.side of Brentwood Dr. <br /> > 7 <br /> 0p p� <br /> -E tl. A �.,8 C <br /> Z U 1 d U <br /> C2 Ln ° F" LITHOLOGY DESCRIPTION WELL CONSTRUCTION <br /> 0 Asphalt and aggregate base Flush mounted traffic rated 0 <br /> vault box. <br /> Fill,silty sand,gravel and asphalt chunks,dense. <br /> Well secured with locking <br /> pressure cap. <br /> 5 33 \\\\ 5 <br /> Near surface to 20 ft.neat <br /> •••••••••••• cement <br /> 10 32 Sand(SP), light olive brown,poorly graded,very fine to fine 10 <br /> grain,trace silt,damp,dense. <br /> 2-inch SCH 40 PVC <br /> Silty Sand(SM). Dark yellowish brown,very fine to fine <br /> 15 34 grained.30-40%silt,micaceous,moist,dense. 15 <br /> 20 32 I5-259 silt. 20 <br /> 20-23 ft.Bentonite Plug <br /> 25 27 Light olive brown 25 <br /> 2-inch SCH 40 PVC,0,020- <br /> inch slot screen 25-40 ft. <br /> #3 filter pack sand 23-40 ft. <br /> 30 25 <br /> Sand with gravel(SP). Dark gray,fine to coarse grain, 30 <br /> approximately 10%gravel up to 1.5cm.in diameter,rounded to <br /> SZ <br /> well rounded,trace silt,saturated,medium dense. <br /> X. <br /> First groundwater encountered at 31.5 ft. <br /> 35 30 Sandy Silt(ML). yellowish brown,nonplastic,3090 fine grained : 35 <br /> sand,moist,very stiff. <br /> Silt with Sand(ML). Light olive brown1 hilt'l ,slightly plastic,up to <br /> 40 30 2090 very fine grained sand,moist,stiff. 40 <br /> 2870 Gateway Oaks Dr.,Ste 300 <br /> lam' Satxa mo,CA 95833 <br /> 916-679-2000 <br />