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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 1116/03 Cascade Drilling Stockton,California CAL Split Spoon OS-36 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): SZ 9.5 First Water Depth(ft.): wt.(lbs.): Dist.(m.): S 19.5 140 30 E C a E Well S z i= XF x a Description Q Construction 2 a a Traffic Rated Well Box o; b; Grout 5 5 FAT CLAY(CH):black(IOYR 2/1),stiff,damp,high 5 plasticity,faint hydrocarbon odor(0,0,100). 2 OS-36 1300 6 @5, b. b' 10 7 SILT WITH SAND(ML):brown(IOYR 5/3),fine grained 7 sand,stiff,moist to wet,moderate plasticity,faint 0 OS-36 1310 Bentonite 9 h drocarbon odor 0 25 75 . 0 @10' Chips FAT CLAY(CH):dark greenish gray(10Y 4/1),stiff, moist,high plasticity,strong hydrocarbon odor(0,10,90). Sand ---------------------------- 1g 5 SILTY SAND(SM):brown(IOYR 5/3),fine grained sand, 0 5 wet to moist 0 65 35 . 0 OS-36 1320 2"Sparge 7 SANDY SILT(ML):brown(10YR 5/3),fine grained sand, @15' TIP 5 stiff,moist,moderate plasticity(0,35,65). 0 5 FAT CLAY(CH):brown(IOYR 5/3),very stiff,moist, 9 high plasticity,(0,0,100). 7 0 .:..:..::..:.. 7 20 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 OS-33-57.GPJ Figure LOG OF BOREHOLE (sheet 1 of I)