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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 10/30/03 Cascade Drilling Stockton,California CAL Split Spoon OS-29 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): SZ 9.5 First Water Depth(ft.): wt.(Ibs.): Dist.(in.): 8 19.5 140 30 o CL E Well a�i Ca z o Construction Description a � a N Traffic Rated Well Box o: o. Grout 5 7 FAT CLAY(CH):dark grayish brown(1 OYR 4/2),stiff, 8 moist,high plasticity,(0,0,100). 1 OS-29 1030 �.� 6 @ 5' SZ 10 9 SANDY SILT(ML):brown(I OYR 5/3),fine grained sand 7 very stiff,moist to wet 0 30 70 . 1 OS-29 1040 8 SILTY SAND(SM):brown(IOY 4/1),fine grained sand, @10' medium dense,moist to wet,(0,60,40). Bentonite Chips Sand 15 7 FAT CLAY(CH):dark greenish gray(IOY 4/1),fine SPH 7 grained sand,stiff,moist,high plasticity,SPH sheen,strong 287 OS-29 1050 8 Ahydrocarbon odor, 0 10,90). SPH @15' 8 SILTY SAND (SM):dark greenish gray(10Y 4/1),fine 8 grained sand,medium dense,moist to wet,SPH sheen, 60 2" Sparge 7 0 60 40 . Tip SILT WITH SAND(ML):dark greenish gray,(IOY 4/1), 73 fine grained sand,very stiff,moist,medium plasticity, oderate hydrocarbon odor, 0 25 75 . 62 20 FAT CLAY(CH):dark greenish gray(IOY 4/1),fine grained sand,stiff,moist,high plasticity,SPH sheen,strong drocarbon odor, 0 10 90 . 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.GPJ Figure LOG OF BOREHOLE (sheet 1 of 1)