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SECOR Intnaationrrllnco rated Logged By Dates Drilled Drilling Contractor Project Name Method/Equipment Boring Number 7/9/01 WEST _ ARCO#49_32 CONTINUOUS CORE CM 719101 IIAZMAT STOCIKTON,CA T HSA SB-1T See°Legend to Logs"for Boring Surface Groundwater Depth(ft} Total Drive Dmp sampling method, Dram(in) Elev(ft) 27.5 FIRST Depth(ft) wt(lbs} Dist{in) classifications and laboratory $ NA T 28 5 STABILIZED 805 NA NA tes n methods '. Well Description Construction GROUT Asphalt Gravelly sand fill SILTY CLAY(CL) very dark grayish brown(10YR3/2),moderate plasticity,very stiff,dry(0,0,30,70) g SANDY SILT(ML)-brown(10YR4/3),fine-grained sand,low plasticity,very stiff, dry,prominent subangular blocky soil structure with fracture,abundant rootholes 0 to Same as above 0 SILTY SAND(SM) yellowish brown(10YR5/4),fine-grained sand,medium dense, dry,weak subangular blocky soil structure,caliche in stringers(0,60,40,0) 15 0 CLAYEY SILT(NII.) yellowish brown(10YR5/4),fine-grained sand,moderate plasticity,very stiff,dry to moist,caliche in stringers(0,20,50,30) Grades to SANDY SILT(NII..) with abundant rootholes and fracturing along 0 subangular blocky soil structure(0,30,60,10) SILTY SAND(SW-olive brown(2 5Y5/4),fine-grained sand,medium dense, moist,some lenses of sand from 24-26 feet(0,65,35,0) The substrata descriptions above are generahzed 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 077 43286.330 Date 8/14/01 PR Log Of Bong 4932SB 1 CM Approved by LOG OF BOREHOLE Figure (sheet 1 of 4)