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BRIERLEY DAILY FIELD REPORT , <br /> ASSOCIATES <br /> Crecting ipoce Underground <br /> Project Hokestra-North Slurry Wall Report No. 4 <br /> Location Firestone, CO Date Monday, April 29, 2013 , <br /> Client Hall-Irwin Page 3 of 4 <br /> Contractor Hall-Irwin File No. 112206-000 <br /> Weather Sunny Temperature Mild(60°-75°) ' <br /> 3. Performed quality control testing on fresh slurry, trench slurry, and soil-bentonite backfill. <br /> 4. Slurry level did not drop below 2ft of surface grade during excavation. ' <br /> 5. The de-sanding machine was not in operation during this shift. <br /> 6. The Komatsu DX65 dozer used in the backfilling operation was not working during this shift, and is , <br /> currently under maintenance for an overheating problem. <br /> 7. Fresh slurry was not within project specifications for unit weight and marsh funnel time during the AM ' <br /> testing. Ruben with Hall-Irwin was immediately notified of the test results. Additional bentonite was <br /> added into the slurry pond. A re-test of fresh slurry in the PM was not within project specifications for <br /> marsh funnel time, but had a unit weight that was acceptable. Ruben was notified of the test results. ' <br /> 8. In-trench slurry was only tested in the PM only because the slurry pond pump was not working correctly <br /> during the AM. Hall-Irwin had to switch to a different pump, and as a result excavation during the AM <br /> was minimal. A sample at key depth was unable to be collected during the AM. ' <br /> 9. HI is keeping the toe of the backfill slope within 30t5 feet of the excavation to allow them to clean out <br /> the key and help prevent sand settling in the slurry wall key. ' <br /> 10. Set Summaries: <br /> [6+40--).6+75] Start: 10:12 pm(20ft)Finish: 10:45 am(24ft) ' <br /> Top of Rock:gray/dark gray,soft,fresh,silty,CLAYSTONE. <br /> [6+75--*7+10] Start: 1:32pm(22ft)Finish:2:00 pm(26ft) ' <br /> Top of Rock:gray/dark gray,soft,fresh,slightly sandy,silty CLAYSTONE. <br /> [7+10--).7+45] Start:2:00 pm Finish:Incomplete <br /> 11. PM profile was performed by Alonzo and Jesus (HI)after RY left the jobsite. , <br /> ATTACHMENTS: <br /> Field Representative(s) Time on/off site Total <br /> Ryan Young 7:00 AM 4:00 PM 9.0 hrs ' <br /> Distribution: Ruben Hernandez; file <br /> C:\Documents and Settings\ksisnroy\Desktop\DFR's\DFR 4-29-13.4.docx Brierley Associates <br />