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Advanced BORING LOG
<br /> GeoEnvironmental, Inc. BOREHOLE NO. : MW-7
<br /> ' 837 Shaw Road, Stockton, CA 95215
<br /> (209) 467-1006 FAX: (209) 467-1118 TOTAL DEPTH : 701
<br /> Project: Stallworth Auto Sales Drilling Co. : Mitchell Drilling
<br /> Site Location: 602 North California Street Rig/Auger Type: CME 75 HT/8.25-inch HSA
<br /> Stockton, California 95205 Logged By: ALC
<br /> Reviewed By: WRL
<br /> Project No. : AGE-NC-99-0682
<br /> Date(s) Drilled: 20 April 2007
<br /> Notes: Total depth of boring 70' below surface grade. Boring = Water Level Before Drilling page 1 of 1
<br /> completed as 2-inch diameter ground water monitoring well. m Water Level After Drilling
<br /> Depth Sample Blows PID Soil USCS Class and Well Well
<br /> ID (per 6") (ppm) Symbol Soil Description Completion Description
<br /> 0 / Well cover cristy box
<br /> - 5 MW7 5 0 SM: Brown SILTY SAND: dry, Into grain, poorly
<br /> graded sand, 300/ silt, no hydrocarbon (HC) odor.
<br /> -10 MW7-10 9-] 5-26 0 ML: Brown SILT: dry, low plasticity, low toughness, no /
<br /> HC.
<br /> I
<br /> —15 MW7-1 S 13-20-26 0 ML: Brown SILT: dry, lowplasticity, low toughness, no /
<br /> HC.
<br /> ML: Brown SILT: damp, low plasticity, low toughness,
<br /> —20 MW7-20 7-16-20 0 no HC. II
<br /> — 25 MW7-25 12-20-25 0 ML: Brown SILT: damp, low plasticity, low toughness,
<br /> no HC. II
<br /> Cement grout seal from
<br /> SM: Brawn SILTY SILTY SAND: wet, 15% silt, fine grain, .5' to 56' bsg.
<br /> — 3 MW1-30 12-16-23 1 poorly graded sand, possible HC odor.
<br /> — 35 MW7-35 14-19-30 0 ML: Brown SANDY SILT: wet, 5% gmwl, 300/a fine
<br /> sand, low plasticity, low toughness, no HC.
<br /> ML: Brown SANDY SILT: wet, 15% fine sand, low
<br /> — 40 MW740 14-19-30 0 plasticity, low toughness, possible HC odor.
<br /> — 45 MW7-45 17-19-24 0 ML: Gray-brown SILT: damp, low plasticity, low
<br /> toughness, possible HC odor. /
<br /> TM ML: Dark gray SILT: damp, low plasticity, low
<br /> — 50 MW7-50 16-22-26 0 toughness, possible HC odor.
<br /> —55 MW7-55 14-23-26 0 CL: Gray SILTY CLAY: damp, 200/a silt, moderate
<br /> toughness, high plasticity, possible HC odor.
<br /> Bentonite seal from 56to
<br /> CL: Gray SILTY CLAY: wet, 35% silt, moderate 58' bag.
<br /> — 60 MW7-60 14-20-26 1 .8 toughness, high plasticity, possible HC odor.
<br /> — 65 CL: Dark gray SANDY CLAY: wet, 35% finctmedium #3 sand from 58' to 70'
<br /> MW7-65 13-19-29 0 bsg.
<br /> grain, moderate toughness, high plasticity, possible HC
<br /> odor. Screen 0.01 interval from
<br /> 60' to 70' bsg.
<br /> —70 MW 7.70 16-24-34 79 CL: Dark gray SANDY CLAY: damp, 35%
<br /> fine/medium grain, moderate toughness, high plasticity, Cap at 79.
<br /> HC odor.
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