2008-10-08_REVISION - M2006080 (7)

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DAILY FIELD REPORT Project Loveland Ready Mix Slurry Wall Location Latimer County, Colorado Client Compass Environmental, Inc. Contractor Compass Environmental, Inc. Weather Partly Cloudy/ Sunny Report No. Date Page File No. Temperature 23 8 April 2008 1 of 2 107021-001 60's F t I. CONTRACTOR'S ACTIVITIES: Contractor Start Work 0700 hrs Contractor Stop Work ? 1800 hrs Top of Backfill Slope at Start 36+50 To of Backfill Slope at Stop 36+90 - yW Toe of Backfill Slope at Start 38+50 Toe of Backfill Slope at Sto 39+10 Last Completed Set at Start 38+90 Last Completed Set at Stop 39+90 Verified Area of Excavated Alluvium and Bedrock (Dail) 3,130 S q. Ft. Total Area Excavated To Date 37,510 S q. Ft. - ^ Excavator Type Komatsu PC800 Fresh Slurry Made Yes FIELD REPRESENTATIVE'S ACTIVITIES: Quality Control Number of Location or Batch # Comments Samples Bentonite Slurry - As-Mixed 1 37+40 Viscosity test failed. No passing viscosity retest on this date. Viscosity verified prior to excavation on 4/9/08. Bentonite Slurry - In Trench 2 39+10,39+90 Trench slurry became weaker as fresh slurry became more dilute during day. Backfill (Slump, Density) 1 36+50 No PM backfill operation. Backfill (Gradation) 1 36+50 Backfill (Permeability) -- -- Next Permeability will be taken around 40+00 Verified Clean AM Backfill Yes 39+60 through 39+90 Trench cleaned to bottom of key prior to next Slope and Bottom of Key excavation set. Verified Depth To Bedrocg y e s 39+00 to 39+90 and Key 1. GS recorded water level below ground surface at STAB 60+00, 70+00, and 39+50. All three were excavated between 8 ft and 10 ft deep through clayey overburden down to sandy/gravel stratum. Ground water results as recorded from ground surface: 39+50: - 8 ft 60+00: - 7 ft 70+00: -9 ft 2. 1000-1700 hrs, GS observes QC check by Compass Environmental on fresh slurry mix. Viscosity was at 40 seconds. Slurry hand added bentonite when jet mixer became clogged and slurry pond became dilute. Fresh slurry mix viscosity dropped to 36 seconds and a weight of 67 pcf. PM backfill and excavation operations halted until trench and fresh slurry viscosities were brought up. Weak slurry was flushed from the line and trench slurry was drained about 3 ft. to be filled by stronger fresh slurry. GS did not attain a passing retest prior to leaving site at 1730 hrs. GS to test trench and fresh slurry properties prior to excavation on 4/9/08. 3. Performed quality control testing on slurry and backfill. Observed backfill and excavation operations. Other tests performed yielded results in general accordance with project specifications. Test results were reported to Al of Compass. Prepared Daily Field Report and updated slurry wall data spreadsheet. ATTACHMENTS: None