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Date Start/Finish: 1/20/09-1/26/09 Northing:2171642.9626 Well/Boring ID: MW-1 D <br /> Drilling Company: Cascade Drilling, Inc. Easting:6335191.8827 <br /> Driller's Name: Tory Salazar Casing Elevation: 12.96'AMSL Client: Chevron Environmental Management <br /> Drilling Method: Hollow Stem Auger Company <br /> Auger Size: 8-inch, 15-inch Borehole Depth: 144.5'bgs Location: Former Unocal Station#9-8227 <br /> Rig Type: CME 95 Surface Elevation: N/A 242 North Sutter Street <br /> Sampling Method: California Modified Split Spoon Stockton,California <br /> Descriptions By: R.Kuhn <br /> � n <br /> E al n c <br /> Z T d E 7 <br /> Z C S w N o o Well/Boring <br /> _ f C o Stratigraphic Description Construction <br /> U <br /> n n > o <br /> w � m m ami o � p m o <br /> p w v) Y m z a- IQ CD <br /> Grey CLAY(CL),dry. <br /> 121}120 23 (120'- N/A N/A N/A N/A <br /> 122•) No recovery. <br /> 24 (122'- N/A N/A N/A N/A <br /> 124') <br /> 25 (124'- 0.4 10,10, N/A 8.7 Grey CLAY <br /> 125-1,5 126•) 11.13 y (CL),trace Silt,moist. <br /> Inner cement <br /> grout(2-135 <br /> 26 (126'- 1.8 9,10, 24 2.6 bgs) <br /> 126') 11,14 <br /> 27 (126- 0.8 10,11, 25 1.3 <br /> 1301) 11,14 Grey SILT(ML),little fine Sand,trace Clay,moist/wet. <br /> 13}1_0 28 (130'- 0.4 9,10, 25 3.8 <br /> 132') 12,14 Grey CLAY(CL),trace Silt,moist. <br /> 29 (132'- 0.2 11,11, 24 2.0 <br /> 134') 11,13 <br /> 30 (134'- 2.0 12,13, 25 2.8 <br /> 13`r 135 <br /> 136) 13,15 — Grey SILT(ML),little Clay,trace fine Sand,moist. <br /> 31 (136'- 13 11,11, 28 5.2 _ Hydrated <br /> 138') 14,14 Bentonite Seal <br /> 28 (135'-137 bgs) <br /> Grey fine SAND(SP),trace Silt,wet. <br /> 32 (138'- 0.8 8A 28 8.9 <br /> 140') 11,11 <br /> 140-140 33 (140'- 0.3 9,9, 24 3.9 <br /> 147) 10,11 No sample taken. 2/12 Sand pack <br /> (137'-144.5'bgs) <br /> 2"Schedule 80 <br /> PVC 0.010" <br /> Slotted Screen <br /> (139'-144'bgs) <br /> 145-145 Bottom Cap <br /> End of boring at 144.5'bgs. <br /> Remarks: bgs-Below ground surface <br /> N/A-Not available/applicable <br /> ARCADIS OD-Outer diameter <br /> PVC-Poly vinyl chloride <br /> Infrastructure,environment, facilities AMSL- Above mean sea level <br /> Odorless unless noted <br /> Project Number:B0046449.0000 Template:boring_well HSA 2007 Page. 5 o <br /> f 5 <br /> Data File:MW-1 D.dat Date:5/19/2009 K Wvnna <br />