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SOIL BORING LOG Boring No B-40 Sheet 5 of 8 <br /> Client Arco Station 6100 Date 2/19/2004 <br /> Address 25775 Patterson Pass Road Drilling Company Gregg Drilling rig type Mobile Drill B-80 <br /> Tracy,CA Driller Chris <br /> Vj"t No 116100 Method Mud Rotary hole diam 5" <br /> Logged By Scott Bittin er <br /> Sample Blow Sam le well Depth DesGnptions of Materials PID <br /> Construc LITHO <br /> Type No Count Time Recov t Scale COLUMN and Conditions PPM <br /> _ ML <br /> 8 1 <br /> 8 2 <br /> _ SM SILTY SAND 81-86 5 dark olive brown 75-85%fine grained sand <br /> 5 B40-83 1225 8 s 15 25%fines moist dense 203 <br /> S 4 <br /> S 5 <br /> - ---------------------------------------- ---_-__----------__------________-----_---------------------------- -----_-__---_-__ <br /> 5 84D-85 13 15 _ 234 <br /> 8 6 <br /> 8 7 <br /> _ siltstone(cemented material)plugged core barrel at 86 5' No recovery <br /> 8 8 865'to885' <br /> e s <br /> 9 0 SM SELTY- - fine grained -------------- <br /> ---------------------------------------------------- — - -- -SAND 89'_91' dark olive brown 75-85%- - - --------------------------- sand -------- <br /> _ 15-25%fines moist dense <br /> S 1340-91 1335 9 1 11-8-- <br /> 9 2 ML SANDY SILT 91-92 5 olive brown 50-60%silt 40-50%fine grained--------------------- <br /> ----------------------------- <br /> --------- ------------------------------------------------------ — --------dry,hard------------------------------- <br /> _ sand,dry,hard <br /> 9 3 <br /> _ $M SILTY SAND 92 5-95 olive brown 70-80%fine grained sand 20-30% <br /> s 4 fines damp,dense <br /> _ (note most of core was runny&disturbed,therefore no sample collected) <br /> 9 5 <br /> ------------------------------------------------------ — ------------------------------------------------------------------------------------------------ -------- <br /> _ Drilled from 95 to 96 with tri-cone bit due to hard conditions <br /> 9 6 <br /> _ ML SANDY SILT with SELTSTONE concretions,light olive brown 85%fines, <br /> S B40_97--------------------14 25-------- 9 7 15%fine pralned sand-dry-hard---------------- 59 <br /> s s <br /> 9 soor recove 98 5-101 a 4 section recovered was SILT olive brown <br /> - ------------------------------------------------------------ -------- <br /> ML dry hard <br /> 100 <br /> Comments <br />