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SECOR 1 Internaltonal InSeTorated Logged By Dates Dnlled Drilling Contractor Project Name Method/Equipment Boring Number ' 7/11/01 WEST ARCO#4932 CONTINUOUS CORE CM 7/11/01 HAZMAT STOCKTON,CA HSA SB- See"Legend to Logs"for Boring Surface Groundwater Depth(ft) Total Drive Drop sampling method, Diam(in) Elev(ft) SZ 27 FIRST Depth(ft) wt(lbs) Dist(in) , classifications and laboratory 8 NA 78 5 NA NA testing methods v o ' Well v rz Description a Construction SILTY SAND(SM) dark yellowish brown(10YR4/4),fine-grained sand,medium 8 dense, moist,moderate chemical odor(0,65,35,0) 14-4 ' 30 Same as above wet moderate odor,freshg asoline 158 , SAND (SP) dark olive gray(M/2),fine-to medium-grained,medium dense,wet, 444 ' strong chemical odor(01100,0,0) 35 662 1 CLAYEY SILT(ML) dark yellowish brown(10YR4/4),fine-grained sand,very 501 , stiff,moist to dry,subangular blocky soil structure,faint chemical odor,top of zone at 34 40 38 5-39 5 feet is caliche rich(0,20,55,25) 50 19 SANDY SILT TO SILTY SAND(ML/SM) very dark grayish brown(2 5Y3/2), ' fine-grained sand,low plasticity,medium dense,wet,pronounced subangular blocky soil structure with wet fractures along structure,faint chemical odor(0,50,50,0) GROUT 45 173 , 248 ' 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 matenal 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 077 43286 330 Date 8/14/01 PR Log of Boring . 4932SB2 GPJ Approved by ' LOG OF BOREHOLE Figure (sheet 2 of 4)