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SOIL BORING LOG Boring No B-41 Sheet 7 of 7 Client Arco Station 6100 Date 4/20/2004 Address 25775 Patterson Pass Road Drilling Company GreggDrilling rig type Mobile Drill B-53 Tracy,CA Driller Robert W'J"t No U6100 Method Mud Rotary hale dram 5' Logged By Scott Bittin er Sample Blow Sample Well Depth Descriptions of Materials PID Construe LITHO Tvne No Count Time R@COV t Scale COLUMN and Conditions PPM _ ML SILT 118'-125 light olive brown with trace white caliche and black 121 manganese oxides-tl�--------------------------------------------------------------------------- 122 123 5 841-124 1157 124 0 125 _ CL SILTY CLAY 125'-125 5' olive dry stiff 126 ML CLAYEY SILT 125 5-1262-olive dry,stiff _ ML SILT 126-128 5,olive to light olive brown trace black manganese oxide 1 ___S_____1341.127 12-10 127 staining drY_stiff ------- ----------- --------- 128 ---------------------- ------------------------ --------- ----------------------- --------`------------------------------------------------------------------------ ___S___--1341.129 ................12 16 129 SM SILTY SAND 128_5-129 1 ,olive brown 60%fine rained sand 40% 1 - - ------------dense-------- --- -- -- --- - -------- ------ --- - - - - _ fines,dry, --------- 130 ML CLAYEY SILT 129 1-130 olive dry stiff 131 ML SILT 130-132 5',light ohve_brown dry stiff ______________ B41 132 12 32 ------- 132 0 133 ML CLAYEY SILT 132 5-133 2 light olive brown dry_stiff - - ________-------------------------------------------------- ---- -___ __ ---_ __-- _--------------------- ML SANDY SILT 133 2-133 7', light olive brown 60-70%silt 30-40%very -------- 134 fine-grained sand dry_stiff S B41-134 1240 CLAYEY SILi1337-135 light olive brown dry stiff 0 135 ML 136 137 138 139 140 Comments total depth of bonng is 135 bgs