2011-11-19_REPORT - M1980244 (5)

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ameO 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 or wait until subsequent temperature monitoring indicates the fill is unfrozen, at no cost to CC &V. 11. Overburden slopes shall be compacted using a method specification and graded to meet the grades and dimensions shown on the DRAWINGS. The Bedding Fill subgrade surface will be prepared as identified in Section 2200 of the SPECIFICATIONS. B. Structural Fill Areas to receive Structural Fill will include, but are not limited to, slope reductions, and miscellaneous site grading. 2. CONTRACTOR shall condition Structural Fill to a moisture content that allows compaction to the required density and that results in a firm, unyielding surface capable of allowing the movement of vehicles and equipment over the surface without causing rutting or other deleterious effects. CONTRACTOR shall place Structural Fill materials with less than 30 percent rock materials above 3/4 -inch size in maximum 12 -inch loose lifts, and compact to 95 percent of maximum dry density (ASTM D698). Section 02200 Page 9 of 18 September 3, 2008 Earthworks Revision 1 PAPhase 5 OSA 2011 Cert Report\Appendices\Appendix E Specifications \02200A.doc