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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 11/3/03 Cascade Drilling Stockton,California CAL Split Spoon OS-25 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): SZ 9.5 First Water Depth(ft.): wt.(lbs.): Dist.(in.): 8 19.5 140 30 Well a v z i= s 3 Description A v Construction a Traffic Rated Well Box i Grout 5 5 FAT CLAY(CH):dark grayish brown(IOYR 4/2),stiff, 0 5 moist,high plasticity,(0,0,100). 5 b' b' 0 Q 10 5 FAT CLAY(CH):dark greenish gray(10Y 4/1),fine 5 grained sand,very stiff,moist with water filled roatholg, 0 5 i hplasticity,stronghydrocarbon odor, 0 10, 0). 24 OS-25 1030 SILT WITH SAND(ML):dark greenish gray(10Y 4/1), @10' Bentonite fine grained sand,stiff,moist to wet,faint hydrocarbon Chips odor, 0 25 75 . ELASTIC SILT(MH):dark greenish gray(1OY 4/1),fine grained sand,very stiff,moist with water filled roatholg, high p sticitY,sgong hydrocarbon odoriL,l OL9Q)_ 15 5 SANDY SILT(NIL):dark greenish gray(5GY 4/1),fine— Sand 5 grained sand,stiff,moist,medium plasticity,strong 325 OS-25 1040 5 hydrocarbon odor,(0,30,70). @15' 8 SILT WITH SAND(NIL):dark greenish gray(5GY 4/1), 274 2"Sparge 6 fine grained sand stiff,moist to wet SPH sheen 0 25 75 . Tip 5 POORLY-GRADED SAND(SP):dark greenish gray 48 (5GY 3/1),fine grained sand,wet,medium dense,moderate h drocarbon odor, 0 95 5 . 40 FAT CLAY(CH):dark greenish gray(5GY 3/1),very 20 stiff,moist,high plasticity,faint hydrocarbon odor, 00100 . 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)