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Wester Hansen . Engineers`` , Inc. PO Box 5891, Vacaville CA 95696 Project: Stockton Developmental Center: Closure In Place Job No.: 6789-12 Location: Tank No. 3: North of Water Tower Date: May, 1991 Boring Designation: B2 Driller: Spectrum Exploration Logged by: BWW Base: Stockton Boring Location: East Tank End Drill Equipment: CME 75 Soils Classification System: USCS Diameter & Type Well Casing: Sample type: BRASS TUBE — SPLIT SPOON NA Soil Matrix: YES Elevation & Datum: NA Date Started: May 1, 1991 Finished: 5-1-91 Completion Depth: 22' BGS Number of Samples: Two Depth to Groundwater: Unknown Depth � .y y (feet) q Lithology Observations:. Field Well z Analysis Construction 5-1'9 B2— Note: Auger angled at 45 degrees 0 3:13C ........................ Lawn...... ..... Moist silty loam, cohesive and fine grained I I ML Clean Dark with some clay content I I I I 5 .. .......... ............................. ........... . ................ ................ Lighter coloration I I ML drier with less cohesion Clean I I 10 .... ...... ...... ........................ ..... .. ....... .... ...... .......................... . .............. .... .. L..I... Increasing cohesion I I OL Increasing clay content I I still fine grained Clean 15 I I _.......................................... .I. .I. No gravels or sand I I No odor or dis—coloration Clean I I 20 1 OH I I I Clean 2 I I I 25I I _. ............................... . L . I . I I I I I 30 I I . ............. ................................ .................... I I I I I 35 .. I I ... ................................ ............................................................ ...... 1 I I I F 40 I I ........ .. ... .. L