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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-42 Boring Surface Groundwater Depth(ft.): Total Drive Drop Diam.(in.): Elev.(ft.): SL 9.5 First Water Depth(ft.): wt.(Ibs.): Dist.(in.): 8 19.5 140 30 o a E Well r x a Description o Construction d C] Q E a C4 Cn Traffic Rated Well Box Grout a, v 5 5 FAT CLAY(CH):black(IOYR 2/1),stiff,damp,high 5 plasticity,faint hydrocarbon odor(0,0,100). 5 OS-42 1400 5 @5' o . Q 10 7 SANDY SILT (ML):dark grayish brown(2.5Y 4/2),fine 6 7 grained sand stiff,moist to wet 0 30 70 . 6 FAT CLAY(CH):dark greenish gray(l0Y 4/1),fine 105 OS 42 1410 grained sand,stiff,moist,high plasticity,moderate odor, @10.5' Bentonite (0,10,90). Chips 15 7 AS ABOVE:black(10YR 2/1), damp, faint hydrocarbon Sand 7 odor(0,0,100). 380 OS-42 1420 9 SANDY SILT (ML):dark grayish gray(LOGY 4/1),fine @15' 6 grained sand,stiff,moist to wet,moderate plasticity,SPH 205 2"Sparge 6 sheen,strong hydrocarbon odor,(0,30,65,5). SPH Tip 8 7 73 7 FAT CLAY(CH):dark greenish gray(LOGY 4/1),stiff, 74 9 moist,high plasticity,moderate hydrocarbon odor, 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 I)