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SOIL BORING LOG Boring No B-41 Sheet 5 of 7 <br /> Client Arco Station 6100 Date 4/19/2004&4/20/2004 <br /> Address 25775 Patterson Pass Road Drilling Company GreggDrilling rig type Mobile Drill B-53 <br /> Tracy CA Driller Robert <br /> fje,t No U6100 Method Mud RotaTy hole diam 5 <br /> Logged By Scott Bittin er <br /> Sample Blow Sample Well Depth Descriptions of Materials PID <br /> Construc LITHO <br /> Type No Count Time Recov t Scale COLUMN and Conditions PPM <br /> B 1 <br /> _ no recovery 80'-82 5' <br /> 8 2 <br /> -- 8 3 SS SANDSTONE 82 5-83 little recovery very hard---------------------------------------------- <br /> S <br /> --------- ----------------------- <br /> S B41-84 16 15 8 4 SM SILTY SAND 83'-84 7 dark grayish brown_70-75%fine grained sand 15 <br /> - -- - — -------- - ---------- -- -- ' ------ - <br /> _ 25-30%fines moist medium dense <br /> ----------- 8 5 SILTY CLAY 84 7'_85' light brownish dray moist-soft <br /> --------------------- — -------- - -- - ------------------------------------ <br /> ------------ -------- <br /> _ no recovery 85'-85 7' <br /> B 6 SM SILTY SAND 85 7-87 olive brown,70%fine grained sand 30%fines <br /> _ moist medium dense <br /> B 7 <br /> _ ML SANDY SILT 87'-87 5 olive brown 15-20%fine grained sand trace clay <br /> 8 8 moist stiff <br /> _ ML SILT 87 5-89',light olive brown 4-8%very fine grained sand dry stiff <br /> B 9 <br /> _ SILTSTONE plugged barrel at 89' No recovery 89-90' <br /> 9 0 <br /> -------------------------------------------------------- -------__`-_-----__------_-_-_-_----"_----------------------------------------------------------- --------ML 51LT 90-94 5,olive brown trace black manganese oxide stains dry <br /> s 1 stiff to very stili - -- <br /> 841-92 ..................2_27.......... 9 2 37 <br /> 9 3 <br /> ------------------------------------------------------- ------------------------------- -------- <br /> 9 4 <br /> _ strong caliche cementation 94 5-94 6' <br /> s 5 SILTY SAND 94 6-95 5 olive brown 60-70%fine-grained-sand 30-40%0 <br /> _ S fines,dry medium dense <br /> ____ 9 6 <br /> ________ _________________________________ _ _------------------------- ________ <br /> _ ML SILT 95 5-99 5 olive brown trace black manganese oxide stains dry <br /> 5 641-97 9 53 s 7 stiff 107 <br /> ----------------------------------------------------- — -------------------------------------------------------------------------------------------------- -------- <br /> 9 e <br /> 9 9 <br /> 5 841-99 10 02 _ ML SILT 99 5'-102' olive brown with white caliche dry nla <br /> 100 <br /> Comments Stopped at 85 bgs on Apnl 19 Resumed drilling on April 20 <br />