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1 <br /> BRIERLEY DAILY FIELD REPORT <br /> ASSOCIATES <br /> Getting ipace Uneergroun0 <br /> Project Hokestra-North Slurry Wall Report No. 5 <br /> ' Location Firestone, CO Date Tuesday, April 30, 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 7ocation or Batch# Results Comments <br /> Control <br /> Soil-Bentonite Backfill <br /> Unit Weight 5+70, 6+40 119., 120.2 pcf <br /> ' Slump 5+70, 6+40 4.75, 5.75 inches <br /> -200 Wash 5+70 47.9 % passing No. 200 <br /> ' Triaxial <br /> Permeability 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 ® Yes <br /> Clean AM ❑ No <br /> Backfill <br /> Slope and <br /> ' Bottom of <br /> Key <br /> ® Yes 7+10-7+45 7+45—>7+80, <br /> Verified' 7+80-�8+15,8+15-->8+50, 4ft key(26 ft total depth),4ft key Depth To ❑ NO 8+50--*8+85 (25 ft total depth),4ft key(24 ft <br /> Bedrock and total depth),4ft key(22 ft total <br /> Key depth),4ft key(23ft total depth) <br /> ' Bedrock Samples Top:7:36 AM,9:30 AM, 11:06 <br /> Frequency = Once per 100LF of 7+80, 8+85 AM, 1:00 PM,2:17 PM <br /> slurry wall Bottom: 8:41 AM, 10:15 AM, <br /> 12:OOPM, 1:50PM,2:35 PM <br /> Average Excavation Time of Bedrock 0.77 Hrs <br /> r 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 />