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G//l// S ECOR Logged By: Date Drilled: Drilling Contractor Project Name: Method/Equipment: Weil Number: STTC-Ozone Well Install Hollow Stem Auger C.Melanion 11/4/03 Cascade Drilling Stockton,California CAL Split Spoon OS-53 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): 9.5 First Water Depth(ft.): wt.(Ibs.): Dist.(in.): S 19.5 140 30 a E V �p v Well a 3 Description a Construction a s a a Traffic Rated Well Box Grout v. V. 5 5 FAT CLAY(CH):black(10YR 2/1),stiff,moist,high 29 ;b`• 5 plasticity,low density,faint hydrocarbon odor(0,0,100). 5 10 5 SANDY SILT(ML):dark gray(5Y 4/1),stiff,moist to 197 7 wet,moderate plasticity,moderate hydrocarbon odor, 217 1200 7 03070 . Bentonite ELASTIC SILT(MH):very dark gray(5Y 3/1),fine Chips grained sand,very stiff,moist,high plasticity,strong odor, (0,10,90). •.. •.•.•Sand --------------------------- 15 5 SILTY SAND(SM):dark greenish gray(10Y 3/1),fine 361 7 l grained sand,medium dense,moist to wet,separate phase j SPH OS-53 1210 9 �0'10'90). 1 rocarbon sheen,strogg_hy ocarbon or 1(au 3,__/ 332 @ 15 2" Sparge ELASTIC SILT(MH):very dark gray(5Y 3/1),fine 317 SPH Tip 7 rained sand,very stiff,moist,high plasticity,strong odor, 8 9 223 SILTY SAND(SM):dark greenish gray(10Y 4/1),fine 7 grained sand,medium dense,wet,SPH sheen at IT,strong 37 8 Jd 20 9 hydrocarbon odor, 0 75 25 . 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)