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SECOR International Incorporated Logged By Date Drilled Drilling Contractor Project Name Method/Equipment Well Number WEST ARCO#4932 SPLIT SPOON CM 6/13/02 HAZMAT STOCKTON,CA HOLLOW STEM AUGER EW-2 See"Legend to Logs"for Boring Surface Groundwater Depth(ft) Total Dnve Drop sampling method, Diam(in) Elev(ft) Depth(ft) wt(lbs) Dist(in) classifications and laboratory 12 NA 28 STABILIZED 450 140 30 tesunz methods b Well a o Descnption Construction A � t4 11 0 18 SILTY SAND(SM) dark yellowish brown(10YR3/4),fine-grained sand, 25 dense,moist,subangular blocky soil structure(0,75,25,0) 30 11 Same as above,increased silt content(0,60,40,0) 6 18 25 SAND(SP) dark brown(10YR3/3),fine-to medium-grained,dense,wet, faint to moderate chemical odor(0,100,0,0) 35 18 347 36 49 14 SILTY CLAY with SAND(CL) olive brown(2 5Y4/3),fine-grained sand, 168 20 moderate plasticity,hard,moist,faint chemical odor(0,20,30,50) 30 SUMP 40 28 184 BENTONM 33 SEAL 18 SANDY SILT(ML).dark yellowish brown(10YR4/4),with clay, 104 BENTO 25 fine-grained sand,low plasticity,hard,moist(0,35,55,10) 36 BACKFILL 21 61 45 29 44 The substrata descriptions above are generalized representations and based upon visual/manual classification of cuttings and/or samples obtained during dnthng 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 Prosect No 77BP 43287.00 0040 Date 8/15/02 PR Log of Well 4932EW2 GP7 Approved by LOG OF BOREHOLE Figure (sheet 2 of 2)