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6 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-32 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): $i 9.5 First Water Depth(11): wt.(lbs.): Dist.(in.): 8 19.5 140 30 E u v o n Well v a z i- x 3 Description A Construction n = ° w C. Traffic Rated Well Box i o: o. Grout 5 5 FAT CLAY(CH):light olive brown,(2.5Y 5/3),stiff, 5 moist,high plasticity(0,0,100). 0 OS-32 1010 5 @5' y --------------------------- 10 5 _ SANDY SILT(ML):brown(10YR 5/3),fine grained sand, 7 _ stiff,moist to wet 0 30 70 . 0 OS-32 1020 5 — FAT CLAY(CH):brown(lOYR 5/3),fined grained sand, 0 @10' stiff,moist,high plasticity,(0,10,90). Bentonite _ Chips — 15 7 _ AS ABOVE:olive gray(5Y 5/2),fined grained sand,stiff, 0 Sand 7 m_oist hi h lastici 0 10 90 . 0 OS-32 1030 z B� tY,� _Z------------� 5 SILT WITH SAND(ML):dark greenish gray,(l0Y 4/1), @15' 5 fine grained sand,stiff,moist to wet,moderate plasticity 0 2"Sparge 6 (0,25,75). Tip 6 SILTY SAND(SM):dark greenish gray,(5GY 4/1),fine 5 rained sand medium dense wet to moist 0 60 40 . 0 7 FAT CLAY(CH):dark greenish gray(5GY 4/1),stiff, 0 20 7 moist highplasticitKjL010,._—__--------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 1-33.GPJ Figure LOG OF BOREHOLE (sheet 1 of 1)