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SOIL BORING LOG Boring No B-42 Sheet 3 of 7 Client Arco Station 6100 Date 4/21/2004 Address 25775 Patterson Pass Road Drilling Company GreggDrilling rip type Mobile Drill B-53 Tracy CA Driller Robert Vject No 116100 Method Mud Rotary hole diam 5' Logged By Scott Bittin er Sample Blow Sam le well Depth Descriptions of Materials PID Construc LITHO Type No Count Time Recov t Scale COLUMN and Conditions PPM _ ML SILT 40-41 1' grayish brown trace white caliche dry stiff 4 i S 842-41 9 47 _ S SILTY SAND 41 1'-41 4 grayish brown 60-70%fine grained sand 2 a ------------------------------------------------- — ------------2 30-40%fi-nes------dry----dense----------------------------------------------------------------------------------- _ ML SILT with SAND 41 4'-43' grayish brown 5-7%very fine grained sand a 3 ellow statnln_qdry stiff-- -- a 4 ML SILT 43'46 5' raish brown 0.2%"very fine grained sand dry stiff ---_ ------------------------------------------- -- --------------------------------- -------- 4 5 4 6 _ caliche and black manganese cement present 46 5-46 8 a 7 ML SILT 46 8'-55 7 dark rayish brown trace caliche and yellow statnin. ------------------------------------------------------ — ----------------------------- -- trace clay,dry,stiff a B S 1342-49 1020 a s 14 5 0 _ increased yellow staining 50'-55 7' 5 1 40---------------------------------------------- 5 2 5 3 ------------------------------------------------------- --"'-------------------------------------------------------------------------------------------- ------- S B42-54 1.030 5 a 124 5 5 5 6 ------------------------------------------------------------------------------------------------------------- S 642-57 SM SILTY SAND 55 7-56 7 brown 60%fine grained sand 40%fines dry 139 5 7 dense _ ML SILT 56 7-59 grayish brown with yellow stains,trace iron oxide stains 5 e dry stiff 5 9 ML SANDY SILT 59'-59 7' grayish brown 5-25%fine grained sand dry 60 Comments i