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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 11/6/03 Cascade Drilling Stockton,California CAL Split Spoon OS-39 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): �Z 9,5 First Water Depth(ft.): wt.(lbs.): Dist.(in.): 8 19.5 140 30 c a ,Ed E Well z [= r x 3 Description a Construction n E m Q a m a V) Traffic Rated Well Box Grout v. v. 5 5 FAT CLAY(CH):black(10YR 2/1),stiff,damp,high 5 plasticity,faint hydrocarbon odor(0,0,100). 2 OS-39 1010 5 AS ABOVE:very dark gray(IOYR 3/1), moist @5' e,. b. 10 5 SANDY SILT (ML):dark gray(5Y 4/1),fine grained 11 7 sand stiff,moist to wet faint hydrocarbon odor 0 30 70 . SPH 8 FAT CLAY(CH):dark greenish gray(IOGY 4/1),fine 132 OS-39 1020 grained sand,very stiff,moist,high plasticity,SPH sheen, @10.5' Bentonite stringers of black staining,moderate odor,(0,10,90). Chips 15 7 AS ABOVE,:dark greenish gray(l0Y 4/1),moist,strong Sand 7 h drocarbon odor 0 0 100. 307 OS-39 1030 y ------Nis----------------- 9 SILTY SAND(SM):dark greenish gray(5GY 3/1),fine 344 @15' 5 grained sand,medium dense,wet,separate phase SPH 2"Spurge 5 h drocarbon sheen stronghydrocarbon odor, 0 70 30 . 86 Tip 9 POORLY GRADED SAND(SP):dark greenish gray(10Y 3/1),fine grained sand,medium dense,wet,moderate hydrocarbon odor(0,100,0). 31 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 1)