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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 11/5/03 Cascade Drilling Stockton,California CAL Split Spoon OS-43 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): Q 9.5 First Water Depth(ft.): wt.(Ibs.): Dist.(in.): 8 19.5 140 30 _ > Well ° 27 z i- Construction s x 3 Description o R a 2 o Traffic Rated Well Box Grout 5 5 FAT CLAY(CH):black(10YR 2/1),stiff,damp,high 5 plasticity,faint hydrocarbon odor(0,0,100). 3 OS-43 1250 6 @5' b' b' ---------------------------- b 10 7 SILT WITH SAND(ML):brown(10YR 5/3),fine grained 21 7 sand,stiff,moist to wet,medium plasticity,faint 7 hydrocarbon odor 0 20 80 . 193 OS-43 1300 Bentonite FAT CLAY(CH):dark greenish gray(IOY 4/1),stiff, @10.5' Chips moist,high plasticity,strong hydrocarbon odor,(0,10,90). Sand 15 7 AS ABOVE,:(O,0,100). 299 7 311 OS-43 1310 2"Sparge 8 SANDY SILT(ML):dark greenish gray(SGY 4/1),fine 368 15 Tip 7 grained sand,stiff,moist to wet,moderate plasticity, 7 separate phase hydrocarbon sheen,strong hydrocarbon odor, 264 5 0 30 70 . 6 FAT CLAY H):dark greenish gray(5GY 3/1),very stiff, 6 moist,high plasticity,moderate hydrocarbon odor, 76 20 7 0 0 100). I SANDY SILT (ML):dark grayish brown(2.5Y 4/2),fine (,grained sand1stiff moist to wet_COL30 70Z_______J 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.GP] Figure LOG OF BOREHOLE (sheet 1 of 1)