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S ECOR Logged By: Date Drilled: Drilling Contractor Project Name: Method/Equipment: well Number: STTC-Ozone Well Install Hollow Stem Auger C.Melanion 11/5/03 Cascade Drilling Stockton,California CAL Split Spoon OS-45 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): SZ 9.5 First Water Depth(ft.): wt.0bs.): Dist.(in.): 8 21.0 140 30 Well g z i= 3 Description q v Construction ° a a � a � Traffic Rated Well Box Grout 5 5 FAT CLAY(CH):black(IOYR 2/1),stiff,damp,high 0 5 plasticity,faint hydrocarbon odor(0,0,100). 5 b' b' SZ 10 5 ELASTIC SILT WITH SAND(MH):brown(IOYR 5/3), 4 5 fine grained sand,stiff,moist to wet,moderate plasticity, 54 OS-45 1050 Bentonite 5 faint hydrocarbon odor 0 20 80. @10' Chips FAT CLAY(CH):dark greenish gray(I OY 4/1),stiff, moist,high plasticity,strong hydrocarbon odor,(0,10,90). Sand 15 5 7 FAT CLAY(CH):dark greenish gray(10Y 4/1),stiff, 377 OS-45 1100 2"Sparge 7 moist,high plasticity,strong hydrocarbon odor(0,0,100). SPH @15' Tip 5 SANDY ELASTIC SILT(MH):dark greenish gray(5GY 249 8 4/1),fine grained sand,stiff,moist to wet,moderate 7 plasticity,hydrocarbon sheen,strong hydrocarbon odor, 69 7 0 30 70 . 9 FAT CLAY(CH):dark greenish gray(5GY 3/1),very stiff, 20 9 moist,high plasticity,moderate hydrocarbon odor, 32 7 (0,0,100). 8 9 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 DWR Log of Well OS44-51.GPJ Figure LOG OF BOREHOLE (sheet 1 of 1)