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BRIERLEY DAILY FIELD REPORT <br /> ASSOCIATES <br /> Creating Spate Underground <br /> Project Hokestra- North Slurry Wall Report No. 1 <br /> ' Location Firestone, CO Date Wednesday, April 24, 2013 <br /> Client Hall-Irwin Page 2 of 4 <br /> Contractor Hall-Irwin File No. 112206-000 <br /> ' Weather Partly Sunny/Cloudy Temperature Cool(45°-60°) <br /> Quality F�t <br /> n or Batch# Results Comments <br /> Control <br /> Soil-Bentonite Backfill <br /> Unit Weight 43+40 119.8 pcf Backfill placed PM only <br /> ' Slump 43+40 4.00 inches <br /> Gradation 43+40 34.5% passing No. 200 <br /> Triaxial <br /> Permeability 0+00 Next sample to be taken at station <br /> 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 M Yes <br /> Clean AM ❑ No <br /> Backfill <br /> Slope and <br /> t Bottom of <br /> Key <br /> Verified M Yes 4ft key(23 ft total depth),4ft key <br /> Depth To El No 0+00- +35,0+35-� + , (23 ft total depth),4ft key(23 ft <br /> Bedrock and 1+400->1+75 depth),0+ -+1+05, 1+05�1+400, total de 4.5ft key25.5 ft total <br /> )' ( <br /> Key depth),4ft key(28 ft total depth) <br /> Bedrock Samples Top: 11:30 AM, 12:45 AM,2:00 <br /> ' Frequency = Once per 100LF of 0+35, 1+40 PM,3:18 PM,4:20 PM <br /> slurry wall Bottom: 12:21 PM, 1:23 PM,2:45 <br /> PM,4:00 PM,5:30 PM <br /> ' Average Excavation Time of Bedrock 0.80 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 />