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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 10/30/03 Cascade Drilling Stockton,California CAL Split Spoon OS-28 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): S4 9.5 First Water Depth(ft.): wt.(lbs.): Dist.(in.): 8 19.5 140 30 _ > E o a Well S d `� 9 E a' z H s x 3 Description o Construction a 2 a a Traffic Rated Well Box 0 0. Grout 5 7 FAT CLAY(CH):dark grayish brown(IOYR 4/2),stiff, 8 moist,high plasticity,(0,0,100). 1 OS-28 1130 9 @5, 0 SZ 10 7 SANDY SILT(ML):olive gray(5Y 4/2),fine grained 8 sand,stiff,moist to wet,medium plasticity,faint 1 OS-28 1140 8 `hydrocarbon odor,(0,30179)________ _ ___/ 49 @ 10' FAT CLAY(Cl3):dark greenish gray(IOGY 4/1),fine Bentonite grained sand,very stiff,moist,high plasticity,strong Chips hydrocarbon odor,(0,10,90). 15 7 SILT WITH SAND(ML):dark greenish gray(5GY 4/1), 52 Sand 8 fine grained sand,very stiff,moist to wet,moderate OS-28 1150 9 hydrocarbon odor,(0,25,75). 124 @15' As above. 2"Sparge 6 SILTY SAND(SM):dark greenish gray(IOY 4/1),fine 9 Tip 9 grained sand,medium dense,wet,faint hydrocarbon odor, 61 7 (0,70,30). 33 7 27 20 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 OS 1-33.GP7 Figure LOG OF BOREHOLE (sheet 1 of 1)