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0 S ECOR Logged By: Date Drilled: Drilling Contractor Project Name: Method/Equipment: well Number: STTC-Ozone Well Install Hollow Stem Auger C.Melanion 10/31/03 Cascade Drilling Stockton,California CAL Split Spoon OS-18 Boring Surface Groundwater Depth(ft.): Total F140 rive Drop Diam.(in.): Elev.(ft.): �? 15.75 First Water Depth(ft.): (Ibs.): Dist.(in.): 8 19.5 30 lu o a E Well v 8 x a Description o Construction a a Traffic Rated Well Box D.'. e.'. o: o: Grout 5 5 FAT CLAY(CH):dark grayish brown(2.5Y 4/2),stiff, 5 moist,high plasticity,(0,0,100). 5 OS-18 900 6 @5 FAT CLAY WITH SAND(CH):dark greenish gray(IOY 4/1),fine grained sand,faint hydrocarbon odor,(0,15,85). 10 5 ——————————————————— 42 5 ELASTIC SILT WITH SAND :dark greenish a ( gT gray 89 OS-18 910 5 (IOGY 4/1),fine grained sand,stiff,moist,medium @10' Bentonite plasticity,moderate hydrocarbon odor,(0,25,75). Chips Sand ___ __________________ 15 5 FAT CLAY(CH):dark greenish gray(IOGY 4/1),fine 308 5 grained sand,very stiff,moist,high plasticity,strong 287 OS-18 920 2"Sparge 5 hydrocarbon odor,(0,10,90). 281 @15' s above stiff 0 0 100 . Ttp 7 idrocarbon LTY SAND(SM):dark greenish gray(10Y 4/1),fine 206 7 ained sand,medium dense,moist to wet,strong 8 odor, 0 55 45 . 47 7 ELASTIC SILT WITH SAND(MH):dark greenish gray 8 (10Y 4/1),fine grained sand,stiff,moist,medium plasticity, 103 20 \(025,75).______ 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. Date 9/29/04 D" Log of Well OS 1-33.GPJ Figs LOG OF BOREHOLE (sheet 1 of 1)