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BRIERLEY DAILY FIELD REPORT <br /> ' ASSOCIATES <br /> Creating 3_e Underground <br /> Project Hokestra-North Slurry Wall Report No. 2 <br /> ' Location Firestone, CO Date Thursday, April 25, 2013 <br /> Client Hall-Irwin Page 2 of 4 <br /> Contractor Hall-Irwin File No. 112206-000 <br /> ' Weather Sunny Temperature Cool(45°-60°) <br /> Quality F�t <br /> n or Batch# Results Comments <br /> ' Control <br /> Soil-Bentonite Backfill <br /> Unit Weight 0+35, 1+40 117.4, 117.8 pcf <br /> ' Slump 0+35, 1+40 5.00, 4.50 inches <br /> -200 Wash 0+35 47.8% passing No. 200 <br /> rTriaxial Next sample to be taken at station <br /> Permeability 15+00 <br /> Test <br /> Cement Stabilized Soil-Bentonite Backfill(when applicable) <br /> Unit Weight XX pcf N/A <br /> ' Slump XX inches N/A <br /> ' Gradation XX% passing No. 200 N/A <br /> Verified Depth <br /> Verified N Yes <br /> Clean AM ❑ No <br /> Backfill <br /> Slope and <br /> Bottom of <br /> Key <br /> Verified N Yes 4ft key(26 ft total depth),4ft key <br /> Depth To El No 1+75-->2+15,2+15--*2+55,' (25 ft total depth),4ft key(24 ft Bedrock and 2+55—>2+90,2+90—�3+25 total depth),4ft key(25 ft total <br /> Key depth), <br /> Bedrock Samples Top: 8:16 AM,9:25 AM, 10:42 <br /> ' Frequency = Once per 100LF of 2+55, 3+60 AM, 1:05 PM,3:30 PM <br /> slurry wall Bottom:9:00 AM, 10:03 AM, 11:33 <br /> AM, 1:50 PM <br /> ' Average Excavation Time of Bedrock 0.70 Hrs <br /> per Set <br /> III, NOTES: <br /> 1. Hall-Irwin(HI)on-site using a Komatsu PC 800 Excavator to remove alluvium material from the slurry <br /> trench. Fresh slurry was placed within trench as work progressed up-station to keep the walls of the <br /> ' trench from collapsing. Backfill material was mixed and placed throughout the day. <br /> 2. Both AM&PM profiles were observed and/or recorded. See attached AM/PM comparison chart for <br /> further details. <br />