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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-48 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 Q ? z .9 x 3 Description ca d ConstructionLiz s a n. w Traffic Rated Well Box Grout o. v 5 5 FAT CLAY(CH):black(10YR 2/1),stiff,damp,high 5 6 plasticity,faint hydrocarbon odor(0,0,100). 6 10 7 ELASTIC SILT WITH SAND(MH):very dark gray(5Y 7 3/1),fine grained sand,stiff,moist to wet,moderate 28 OS-48 1410 Bentonite 9 lastici faint hydrocarbon odor 0 25 75 . 113 @10' Chips FAT CLAY(CH):dark greenish gray(IOY 3/1),fine grained sand,very stiff,moist,high plasticity,moderate odor,(0,10,90). Sand 15 6 FAT CLAY(CH):dark greenish gray(5GY 3/1),stiff, 6 moist high vlasticity,strong hydrocarbon odor 0 0 100). 406 OS-48 1420 8 ELASTIC SILT WITH SAND(MH):dark greenish gray 381 @15' 2"Sparge (5GY 3/1),fine grained sand,very stiff,moist to wet, Ttp 7 moderate plasticity,strong hydrocarbon odor,(0,25,75). 389 8 7 ELASTIC SILT(MH):dark greenish gray(10Y 4/1),fine 7 grained sand,very stiff,moist,high plasticity,faint 55 20 9 h drocarbon odor, 0 10 90 . 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-44-51.GPJ Figure LOG OF BOREHOLE (sheet 1 of 1)