2011-10-06_REVISION - M1980244 (3)

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Section 02200 Earthworks I. Pipe Bedding Material ame 1. Pipe Bedding material shall be placed around the CSP as shown on the drawings. 2. For piping external to the valley leach facility, CONTRACTOR shall compact the Pipe Bedding Material requiring compaction to at least 95 percent of the maximum dry density as determined by the Standard Proctor density test (ASTM D698), and a moisture content 3 percent below and 3 percent over the optimum moisture content. 3. CONTRACTOR shall place Pipe Bedding Material in maximum 12 -inch loose lifts. Pipe Bedding Material will be worked under pipe haunches by hand to provide uniform support of the CSP. 4. Native material used for backfilling CSP excavation shall be placed in 12 -inch to 18 -inch loose lifts, and compacted by wheel rolling with light, rubber tired or other light compaction equipment, as approved by CERTIFYING ENGINEER. J. Granular Filter Material I. Granular Filter Material shall be placed beneath the Riprap as shown on the drawings. K. Bedding Fill 1. Bedding Fill shall be placed within the limits of the valley leach facility as shown on the DRAWINGS. 2. CONTRACTOR shall place and compact the Bedding Fill in loose lifts such that the compacted lift thickness is a minimum of 12- inches. CONTRACTOR shall condition the Bedding Fill to allow a surface that does not cause rutting or other deleterious effects. The moisture content and density shall be uniform throughout the lift. If a lift of compacted Bedding Fill dries out during placement operations, CONTRACTOR shall scarify, moisture condition the dry soil and recompact the lift. If a lift of compacted Bedding Fill becomes overly wet due to precipitation or over watering, CONTRACTOR shall allow the wet soil to dry to the specified moisture content range before recompaction of fill and placement of geosynthetic materials. 3. CONTRACTOR shall assist CQA Monitor in obtaining soil samples for CQA testing. Bedding Fill sampling shall be scheduled by CQA Monitor with CONTRACTOR to facilitate CQA field testing. 4. CONTRACTOR shall trim the surface of the Bedding Fill to the design grades shown on the DRAWINGS. 5. CONTRACTOR shall roll the surface of the Bedding Fill with a smooth drum roller to remove ridges and surface irregularities greater than 0.5 inches in height. CERTIFYING ENGINEER shall determine if surface preparation is sufficient to place geomembrane. On areas with slopes steeper than 3H:1 V, CONTRACTOR shall adopt methods as necessary to obtain the same final surface preparations that would be obtained by the passage of a smooth -drum roller on flat or level ground. Pushing of compaction equipment by tracked equipment shall not be performed. Wheel ruts on the surface of the Bedding Fill from grading equipment shall be repaired by CONTRACTOR prior to placement of the geomembrane by rolling the surface as approved by CQA Monitor. CONTRACTOR shall S: \Projects \1125G Squaw Gulch Valley Leach Facililty Design \I - Tech Specs\02200.r0.doc Page 17 of 18 January 14, 2011 Revision 0