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SOIL BORING LOG Boring No B-45 Sheet 9 of_;,4 Client Former Arco Station 6100 Date 11115!2005 Aes 25775 Patterson Pass Road Drilling Company Gregg rilling rig type Mobile Drill B-80 Tracy CA Driller Chris SL Prerre Project No U6100 Method Mud Rotary hole dram 5" Logged By Scott Blttinger Sample Blow Sample well Depth Descriptions of Materials PID Construe LITHO Type No Count Time Recov t Scale COLUMN and Conditions PPM a I ML SILT 40'-43 light brownish g arae white caliche dry_verb strff _ — 4 2 _ 4 3 _ ML SANDY SILT 43'-44 5 light brownish gray 70-80%silt 20-30%very a 4 fine grained sand_dry very stiff a 6 ML SILT 44 5-46 2 _light brownish gray trace yellow staining dry vers_tiff 4 6 _ 5 SAND with SILT 46 2'-46 5',70%medium to coarse grained sand, 30% S B45-47 1320 a 7 silty fines well graded-dry,medium dense ------------ -'' ------ ---- ------ — - ---------------------------- --------- ---------- -------- _ ML SILT 46 5-50' grayish brown with yellow staining dry very stiff 4 6 4 9 5 0 _ ML SILT 50'-52' grayish brown with yellow staining trace white caliche ----------------------------------------------- 5 t dry very stl-------------------------------------------------------------------------------- -------- 5 2 _ CALICHE 52-52 5' white to light gray 5 3 ML SILT 52 5_53',light brownish_gray with white-caliche-dry-very stiff ____ 5 a ML incomplete-recovery-53--55 Material Is _ SANDY SILT light brownish gray 53-54'(dry) light olive brown 54'-55' s s {molst�-55.60%silty Tinos 40_45%very fine grained sand ---------------------------- --- 5 6 5 B45 56 13 45 _ ML SILT 55-59 5' olive brown 55-56' grayish brawn 56-59 5' trace white 0 5 7 caliche 2_5%very fine grained sand dry very stiff— ----------------_ sa 5 9 _ SILTY SAND 59 5'-60 5',olive brown 65-70%fine grained sand 30-35% 6 o SM silty fines moist medium dense Comments No sod cores were retained from 0 to 40 feet bgs