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SOIL BORING LOG Boring No B-42 Sheet 4 of 7 Client Arco Station 6100 Date 4/21/2004 Address 25775 Patterson Pass Road Drilling Company GreggDrilling rig type Mobile Drill B-53 Tracy,CA Driller Robert tect No U6100 Method Mud Rotary hole diem 5' Logged BX Scott Bittin er Sample Blow Sam to well Depth Descriptions of Materials Pip Construe LITHO Type No Count Time Recov t Scale COLUMN and Conditions PPM _ ML SILT 59 7-62 5 light brownish gray with white caliche and yellow stains '- --- ---------------------------------------------- s dry vera stiff s z S 642-62 10 52 >11039 6 3 SM SILTY SAND 62 5'-64 7 olive brown 70%fine grained sand 30%fines ------------------------`--------------------------- — -- - --- - - -- --- ----' --- ---- --------- moist dense 6 4 -------------------------------'-^-^-------- --------- — 913 5 642-64 1105 _ 6 5 _ ML SILT 65-66 5 light olive brown with black manganese oxide stains, 6 6 yellow stalninis from fib-66 5 dry stiff----------------------------------------------------------- 7 ________ML SILT 66 5'_70' brownishVL_y with Yellow stains dry-stiff-----_---_ 6 B 6 9 __ 7 0 _ ML very poor recovery 70'-72 5' soil recovered was CLAYEY SILT olive 1 brown moist stiff ----------------------------------- ------ 2 -------------------------------------------------------------------------------------------------- -------- 3 no core recovered 72 5-73 _ ML SILT 73-74 light olive brown dry very stiff _ __ 7 4 - 5 B42-74 SM SILTY SAND 74-76 8' olive brown,70%fine grained sand 30%fines 16 5 moist s > > ML SANDY SILT 76 8_77 2,light olive brown 15-25%fine grained sand ---------------------------^---------------------- -- - - ------- _ moist stiff S B42-77 11 50 1 a SP-SM SAND with SILT 77 2'-79 3' olive brown 90%fine drained sand 10°/a 27 _ fines,moist medium dense 7 9 S 642-79 11 -57 SANDY SILT 79 3'-80' light olive brown 50-60%fines,40-50%fine 14 e o ML grained sand moist stiff Comments