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BRIERLEY DAILY FIELD REPORT I <br /> ASSOCIATES <br /> cfecti v s—und&r—w <br /> Project Hokestra-North Slurry Wall Report No. 8 ' <br /> Location Firestone, CO Date Friday, May 03, 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 de-sanding machine was in operation throughout most of the shift. <br /> 6. The backfill operation utilized the PC300 excavator and a rental dozer. The Komatsu DX65 is still under <br /> maintenance. <br /> 7. 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 /> 8. Set Summaries: , <br /> [12+70--+13+05] Start: 8:05 am(18ft)Finish: 8:28 am(22ft) <br /> Top of Rock:gray/dark gray,medium soft,fresh,blocky,slightly silty,sandy CLAYSTONE. ' <br /> [13+05-13+40] Start:9:05am(18ft)Finish: 9:35 am(22ft) <br /> Top of Rock:gray/dark gray,soft,fresh,blocky,sandy CLAYSTONE. <br /> [13+40+13+75] Start: 10:15am(17ft)Finish: 10:45 am(21ft) ' <br /> Top of Rock:gray/dark gray,very soft,fresh,sandy CLAYSTONE. <br /> [13+75—>14+10] Start: 11:1lam(17ft)Finish: 11:45 pm(21ft) <br /> Top of Rock:gray/dark gray,very soft,fresh,sandy CLAYSTONE. <br /> [14+10—*14+45] Start: 12:00pm(18ft)Finish: 12:35 pm(22ft) ' <br /> Top of Rock:gray/dark gray,very soft,fresh,sandy CLAYSTONE. <br /> [14+45--�14+80] Start: 1:24pm(17ft)Finish:2:00 pm(21ft) , <br /> Top of Rock:gray/dark gray,soft,fresh,planer,slightly silty,sandy CLAYSTONE <br /> [14+80­ 15+15] Start:2:33pm(15ft)Finish:3:00 pm(19ft) <br /> Top of Rock:gray/dark gray,soft,fresh,blocky,slightly silty,sandy CLAYSTONE. ' <br /> [15+15-15+50] Start:3:27pm(15ft)Finish:4:00 pm(19ft) <br /> Top of Rock:gray/dark gray,soft,fresh,blocky,sandy CLAYSTONE. ' <br /> [15+50--+15+85] Start:4:24pm(16ft)Finish:4:45 pm(20ft) <br /> Top of Rock:gray/dark gray,soft,fresh,blocky,sandy CLAYSTONE <br />