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0 S ECOR Logged By: Date Drilled: Drilling Contractor Project Name: Method/Equipment: well Number: STTC-Ozone Well Install Air Rotary C.M. 10/16/03 Cascade Drilling Stockton,California Casing Hammer OS-16B Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): �Z 14.5 First Water Depth(ft.): wt.(Ibs.): Dist.(in.): 8 41.5 140 30 o Well 0 0 z w x 3 Description w Construction o o m p [= a Q ti 12 POORLY GRADED SAND WITH SILT(SP-SM):dark 320 25' 1120 22 greenish gray(LOGY 3/1),fine grained sand,medium dense, ;. 37 wet moderate hydrocarbon odor, 0 90 10 . 366 SILTY SAND(SM):dark greenish gray(LOGY 3/1),fine grained sand,very dense,wet,moderate odor,(0,80,20). v. o Bentonite 30 8 SILTY SAND(SM):dark greenish gray(IOGY 3/1),fine 666 30 1 140 12 grained sand,medium dense,wet,moderate to strong 20 739 hydrocarbon odor,(0,75,25). #3 Sand As above,fine medium grained sand. 2" Sparge 35 6 As above,moderate to strong hydrocarbon odor,large 3430 35' 1320 Tip 17 fragments of decaying wood. (over 29 range) Bentonite 40 12 SANDY ELASTIC SILT(MH):dark greenish gray(10G 1432 20 M),fine grained sand,very stiff,moist to wet,moderate 40.5' 1400 32 plasticity,moderate hydrocarbon odor, 0 30 70 . 1180 I FAT CLAY(CH):dark greenish gray(5BG 3/1),hard, (moist,high plasticity,moderate hydrocarbon odor, I IT,0 LOT.----------------------J 45 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. 770T.43673.06.0007 Date 11/19/04 Log of Well OS1B-16B.GPJ Figure LOG OF BOREHOLE (sheet 2 of 2)