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SOIL BORING LOG Boring No B-40 Sheet 6 of 8 Client Arco Station 6100 Date 2/19/2004 Address 25775 Patterson Pass Road Drilling Company Gregg Drilling rig type Mobile Drill B-80 Tracy,CA Driller Chris rotect No U6100 Method Mud Rotary hole dram 5 Logged By Scott Bittin er Sample Blow Sample well Depth Descriptions of Materials PID Construc LITHO Type No Count Time Recov t Scale COLUMN and Conditions PPM 101 M L SILT 101-104 fight olive brown 1-2%very fine grained sand dry hard - - - --'- 102 5 640-103 1442 103 206 -------- -- - - - 104 ML SANDY SILT 104'-104 5' olive brown,20-50%fines moist---very--stiff ----------- --- --- - - -- - -- - - --- --- -- -- - S_-_ 1340105------------------1452 ------'-- 105 SM SILTY SAND 104 5'-105 2' olive brown 60-70%fine drained sand moist----- _124- ------ ------ -------------------------------------------------------------------- _ dense 106 _ ML SILT 1052-107 5' olive brawn dry hard 107 5 640 108 14 58 i0s 136 - ----- 1340 108-----------------14 8 -------- ------- ------ ----------------I- - -'----'---------------------------------------------------- -------- ML SILT i07 5-109' dark yellowish brown trace black manganese oxide --------_ 109 stains,d ,ve stiff 110 ML SILT-1-09-113_5 with white caliche trace black manganese oxide stains 109-111 5 dry hard 111 112 __________------------------------ _________________ S B40-113 1516 113 24-0-- 114 _ ML poor recovery 113 5'-116',soil recovered was SILT dark yellowish 116 brawn to light olive brown with black manglanese oxide stains_dry________ _ _ very sill 116 117 __________________________ 116 ML SILT 116'-120' dark yellowish brown to olive brown_dry_hard_____ _ ____ -------------- 1340-119 -___-- 1340-119 15 35 119 3 120 Comments