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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 11/7/03 Cascade Drilling Stockton,California CAL Split Spoon OS-33 Boring Surface Groundwater Depth(ft.): FDT al Drive Drop Diam.(in.): Elev.(ft.): SZ 9.5 First Water (ft.): wt.(lbsDist.(in.): 8 5 140 30 Well S o n z x Description A Construction v 2 Traffic Rated Well Box Grout w. v 5 5 FAT CLAY(CH):light olive brown,(2.5Y 5/3),stiff, 5 moist,high plasticity(0,0,100). 0 OS-33 930 5 @5 o. 4 10 7 FAT CLAY WITH SAND(CH):dark greenish gray,(IOY 7 4/1),fine grained sand,stiff,moist to wet,moderate 0 OS 33 940 9 lastici 0 25 75 . @10' ORGANIC SOIL(OL/OH):brown(l0YR 5/3),fined Bentonite grained sand,stiff,moist,high plasticity,(0,10,90). Chips 15 8 - SILTY SAND (SM):dark greenish gray,(5GY 4/1),fine 0 Sand 9 grained sand,medium dense,wet to moist,(0,60,40). 0 OS-33 950 10 SANDY SILT(ML):dark greenish gray,(l0Y 4/1),fine @15' 7 grained sand,very stiff,moist to wet,moderate plasticity 0 2"Sparge 7 0 25 75 . Tip 9 SILTY SAND(SM):dark greenish gray,(5GY 4/1),fine 6 rained sand medium dense wet to moist 0 60 40 . p 6 ORGANIC SOIL(OL/OH):dark greenish gray(5GY 4/1), 0 20 7 stiff,moist high plasticity,(0,0,100). 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)