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BRIERLEY DAILY FIELD REPORT ,
<br /> ASSOCIATES
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<br /> Project Hokestra-North Slurry Wall Report No. 3
<br /> Location Firestone, CO Date Friday, April 26, 2013 '
<br /> Client Hall-Irwin Page 3 of 4
<br /> Contractor Hall-Irwin File No. 112206-000
<br /> Weather Sunny Temperature Cool(45°-60°) '
<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 /> 3. Performed quality control testing on fresh slurry, trench slurry, import material, and soil-bentonite
<br /> backfill.
<br /> 4. Slurry level did not drop below 2ft of surface grade during excavation. ,
<br /> 5. The unit weight and sand content of in-trench slurry was above project specifications. The de-sanding '
<br /> machine was not in operation during this shift.
<br /> 6. HI is keeping the toe of the backfill slope within 30±5 feet of the excavation to allow them to clean out
<br /> the key and help prevent sand settling in the slurry wall key. '
<br /> 7. Set Summaries:
<br /> [3+25—>3+60] Start:3:30 pm(19ft)Finish:8:16 am(23ft) '
<br /> Top of Rock:gray/dark gray,soft,fresh,silty,CLAYSTONE.
<br /> [3+60-3+95] Start:9:21 am(19ft)Finish: 10:00 am(23ft)
<br /> Top of Rock:gray/dark gray,very soft,fresh,blocky,silty,CLAYSTONE.
<br /> [3+95--*4+30] Start: 10:37 am(21ft)Finish: 11:02 am(25ft) '
<br /> Top of Rock:gray/dark gray,soft,fresh,blocky,silty,CLAYSTONE.
<br /> [4+30--+4+65] Start: 11:33 am(20ft)Finish: 12:47 pm(24ft)
<br /> Top of Rock:gray/dark gray,very soft,fresh,silty CLAYSTONE.
<br /> [4+65—*5+00] Start: 1:13 pm(20ft)Finish: 1:47 pm(24ft)
<br /> Top of Rock:gray/dark gray,very soft,fresh,blocky,silty CLAYSTONE
<br /> [5+00�5+35] Start:2:20 pm(18ft)Finish:2:50 pm(22ft) '
<br /> Top of Rock:gray/dark gray,very soft,fresh,silty,slightly sandy CLAYSTONE.
<br /> [5+35-5+70] Start:3:15 pm(20ft)Finish:3:41 pm(24ft) ,
<br /> Top of Rock:gray/dark gray,very soft,fresh,silty CLAYSTONE
<br /> [5+70--+6+05] Start:4:19 pm(20ft)Finish:4:54 pm(24ft) '
<br /> Top of Rock:gray/dark gray,very soft,fresh,silty,slightly sandy CLAYSTONE.
<br /> [6+05-->6+40] Start: 5:30 pm(20ft)Finish:6:30 pm(24ft) '
<br /> Top of Rock:gray/dark gray,soft,fresh,blocky,silty CLAYSTONE
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