2016-01-14_REPORT - M1980244 (8)

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Section 02200 Page 9 of 18 January 14, 2011 Earthworks Revision 0 S:\Projects\1125G Squaw Gulch Valley Leach Facililty Design\I - Tech Specs\02200.r0.doc excessive gaps are left between successively dumped loads of materials. The fill shall be leveled prior to compaction by means of a dozer or grader, or other suitable approved equipment, to obtain a surface free from depressions. 7. Except in areas approved by MANAGER and CERTIFYING ENGINEER where space is limited or otherwise specified, CONTRACTOR shall place fill by routing the hauling and spreading units approximately parallel to the axis of the fill. As far as practical, hauling units shall be so routed that they do not follow in the same paths, but split their tracks evenly across the surface of the fill to enhance compaction. 8. CONTRACTOR shall apply water required for moisture conditioning on the fill or in the borrow areas. CONTRACTOR shall maintain fill materials within the moisture content range required to permit proper compaction to the specified density with the equipment being used. The moisture content of the fill materials, prior to and during compaction, shall be uniform throughout each layer of the material. Prior to mixing of wet and dry material on the fill to obtain the proper moisture content, approval shall be obtained from CERTIFYING ENGINEER. Mixed material shall have a uniform distribution of the moisture content prior to placement on the subsequent lift. When materials spread on the fill are too dry for proper compaction, CONTRACTOR shall spray water on each layer of the fill and shall work the moisture into the fill by harrowing or other approved means, until a uniform distribution of moisture is obtained. Material that is too wet for proper compaction, as determined by CERTIFYING ENGINEER, shall be removed from the fill and/or spread out and permitted to dry, assisted by disking and harrowing or mixing in dry material when permitted by CERTIFYING ENGINEER, if necessary, until the moisture content is reduced to an amount suitable for obtaining the specified degree of compaction, at no cost to CC&V. 9. After each layer of fill material has been placed, spread, and moisture-conditioned, the layer shall be compacted by passing compaction equipment over the entire surface of the layer a sufficient number of times to obtain the required density, as specified herein. Compaction shall be accomplished with equipment and by methods approved by CERTIFYING ENGINEER. If such equipment or methods are found unsatisfactory for the intended use, CONTRACTOR shall replace the unsatisfactory equipment with other types or adjust methods until proper compaction is achieved. Prior to placement of a subsequent lift, the previous lift shall be thoroughly scarified to a nominal depth of 2-inches to provide good bonding between lifts. Scarification shall be accomplished by disking, raking with a grader, or an alternative method approved by CERTIFYING ENGINEER. 10. The CQA Monitor will measure the ambient air temperature on an hourly basis. If the ambient air temperature is less than thirty-two degrees Fahrenheit for more than one hour (1) over the preceding twenty-four (24) hours, the CQA Monitor will measure the temperature of the fill to determine if the fill is frozen. "Frozen" is defined as a mean temperature of thirty-two degrees Fahrenheit (32°F) or less. The CQA Monitor will measure the temperature at a depth of three (3) inches and six (6) inches, recording the lower of the two. Six (6) measurements will be taken per acre, and if the average is below thirty-two degrees Fahrenheit (32°F), the fill will be considered frozen. If the fill is determined to be frozen the CONTRACTOR may either remove and replace the frozen fill