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S ECOR ' Logg713y: Date Drilled: Drilling Contractor Project Name: Method/Equipment: well Number: 76 Station#1205MW-16 T9111103 CASCADE Lathrop,California HSA Boring Surface Groundwater Depth(ft.): Total Drive Drop ' Diam.(in.): Elev.(ft.): -7 15.5'First Water Depth(ft.): wt.(lbs.): Dist.(in.): 8 26.0 . 140 30 w Z ' Well 3 Description Q Construction = ° 8"Well Box ASPPIALT Concrete HAND AUGER ' Bentonite '. : 2"SCE.40 PVC 5 21 POORLY GRADED SAND(SP):Dark reddish brown(5 YR 412), 50-6 dry, very dense,sub-angular to sub-rounded,no odor,(0, 85, 15,0) 0.0 W-1 @5' 43 Sand 2"SCH. 40 10 21 SAME AS ABOVE: Reddish gray(10 R 511),(0,95,5,0) 0.0 -1 ' PVC Slotted 32 @10' Screen 45 SAME AS ABOVE ____ __ _ __— 15 9 SILTY SAND{SM): Brown(7.5 YR 413},wet,dense, US angular to 0.0 -I 11 sub-rounded,no odor,(0,70,30,0) @15' ' 24 --------------------- -- -- CLAYEY SAND WITH SILT(SL): Brown(7.5 YR 412),wet,dense, no odor,(0,60, 15,25) ' 20 0.0 -1 13 @20' 19 ___ _ _ _ _ ---- 22 WELL GRADED SAND(SP): Dark reddish brown(5 YR 3/2),very wet,very dense,sub-angular to sub-rounded,no odor,(0,95,5,0) 25 21 0.0 -1 50 @25' ' The substrata descriptions above are generalized representations and based upon visual/manual classification of cuttings and/or samples obtained during drilling. Predominant material types shown on the log may contain different materials and the change from one predominant material type to another could be different than indicated. Descriptions on this log apply only at the specific location at the time of drilling and may not be representative of subsurface conditions at other locations or times. ' Project No. 77CP.61205.07.0010 Date 9/11/03 Log Of well ' 1205MW-16.GP! Figure LOG OF BOREHOLE (sheet 1 of 1)