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S ECOR Logged By: Date Drilled: Drilling Contractor Project Name: Method/Equipment: well Number: STTC-Ozone Well Install Air Rotary C.M. 10/20/03 Cascade Drilling Stockton,California Casing Hammer OS-11B Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev(ft.): SZ 12 First Water Depth(ft.): wt.(Ibs.): Dist.(in.): 8 40.0 140 30 Well c U L Construction Description a Ca FAT CLAY(CH):dark greenish brown(10GY 4/1),fine grained sand,very stiff, 22 moist,high plasticity,faint hydrocarbon odor,(0,10,90). Bentonite SILTY SAND(SM):dark greenish gray(IOGY 3/1),fine grained sand,medium dense,wet,moderate odor,(0,60,40). #3 Sand 30 38 ---------------------------------------- ELASTIC SILT WITH SAND(MH):dark greenish gray(IOGY 3/1),fine grained sand, stiff,moist,medium plasticity,faint hydrocarbon odor,(0,20,80). 2"Sparge POORLY GRADED SAND WITH SILT(SP):dark greenish gray(5GY 3/1),fine 59 Tip grained sand,medium dense,wet,moderate hydrocarbon odor,(0,90,10). ---------------------------------------- 35 POORLY GRADED SAND(SP):dark greenish gray(5GY 3/1),fine grained sand, medium dense,wet,moderate hydrocarbon odor,(0,100,0). 92 As above,decayed wood fragments. 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 OS 1 B-16B.GPJ Figure LOG OF BOREHOLE (sheet 2 of 2)