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DATTLE MOUNTAIN RESOURCES Page 6-2 <br />San Luis Project Technical Specifications <br />gradations of hvo materials are not compatible, in [he opinion of the Designer, [he Contractor <br />shall place and compact, as specified, not less than two feet of material of an intermediate <br />gradation between the incompatible materials. <br />If, in the opinion of the Designer, [he surface of any layer of the fill is too dry of too smooth to <br />bond properly with the layer of material to be placed thereon, it shall be moistened and/or <br />worked with a harrow, scarifier, or other equipment to provide a satisfactory bonding surface <br />before the next layer of fill material is placed. If, in the opinion of the Designer, the prepared <br />surface is too wet for proper compaction of the fill material to be placed thereon, it shall be <br />removed and allowed to dry or shall be worked with a harrow, scarifier, or other equipment to <br />reduce the moisture content to the required amount as directed by the Designer, and then <br />compacted before the next layer of fill material is placed. <br />Riprap shall be placed in a mazmer which will avoid segregation and accumulation of the lazger <br />or smaller stone sizes. Riprap placement shall include final grading to result in a relatively <br />uniform surface free of stones which protrude significantly above adjacent stones and meets the <br />approval of the Designer. <br />When competent bedrock is encountered in spillway excavations, the channel lining material <br />specified may be omitted. Adjacent channel segments shall be constructed such that a smooth <br />transition into and out of the bedrock lined section is created. This work shall be closely <br />supervised by and must meet the approval of the Designer. <br />Unless otherwise approved by the Designer, the slope of rock against which compacted fill is to <br />be placed shall not be steeper that 1 H:1 V and no steeper than 2H:1 V in the case: of foundation <br />soil surfaces. <br />6.2 Material Type 1 -Compacted Backfill <br />The Contractor shall furnish, transport and place Type 1 material as set forth in the <br />Specifications, the Drawings, or as directed by the Designer. <br />Material Type 1 will be used as bedding and structural backfill for the culvert a[ the West Pit. <br />The material shall have low plasticity, plasticity index not exceeding 6 as determined by ASTM <br />D 424 and liquid limit not exceeding 35 as determined by ASTM D 423. The material may be <br />obtained from borrow pits or excavations on site or imported. Type 1 backfill shall meet the <br />following gradation requirements: <br />N:\DHALLMANISANLUIS\SANLUIS.DOC 6-2 SRK Proieci NO. 14732 <br />