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Ms. Erica Crosby, Division of Minerals and Geology <br />March 23, 2005 ~~ <br />Page 11 <br />of the foundation for placing embankment materials thereon, and of all materials for use in c i v r r R E s ~u R c E s, r r c <br />embankment construction, will be determined and approved by the Engineer. No embankment <br />material shall be placed in the embankment when either the material or the foundation or <br />embankment on which it would be placed is frozen. In any separate portion of cut-off trench or <br />embankment being constructed, each layer of each zone shall be constructed continuously and <br />approximately horizontal for the width and length of such portion at the elevation of the layer. If <br />traverse slopes are required in the cut-off trench embankment, slopes shall be no steeper than 4:1 <br />(horizontal to vertical). <br />Material Placement <br />The earthfill material shall be placed in the slope liner in continuous and approximately horizontal <br />layers, not more than 9" loose lift thickness. The combined excavation and placing operations shall <br />be such that the materials will be sufficiently blended to secure the best practicable degree of <br />compaction and stability. To achieve sufficient blending, in addition to the insitu bedrock processing, <br />a disc will be required dudng placement of any slope liner fill. The material shall be compacted to a <br />minimum of 95% of the Standard Proctor as described in ASTM D698. The method of compaction <br />shall be submitted to the Engineer for approval. Self-propelled tamping sheepsfoot type rollers shall <br />be used for compacting. The rollers shall be capable of effectively achieving the required density for <br />the entire depth of the lifts being placed. <br />If, in the opinion of the Engineer, the surface of the prepared foundation or the compacted surface of <br />any layer of earthfill is too dry or smooth to bond properly with the layer of material to be placed <br />thereon, it shall be moistened andlor worked with harrow, scarifier, disc, or other suitable equipment, <br />in an approved manner to a sufficient depth to provide a satisfactory bonding surface before the next <br />succeeding layer of earthfill material is placed. If in the opinion of the Engineer, the compacted <br />surface of any layer of the earthfill in-place is too wet for proper compaction of the layer of earthfill <br />material to be placed thereon, it shall be removed, allowed to dry; or be worked with harrow, scarifier, <br />disc, or other suitable equipment to reduce the moisture content to the required amount; and then it <br />shall be recompacted before the next succeeding layer of earthfill material is placed. <br />Material Properties <br />The below grade slope liner (Zone 1) will be comprised of compacted clayey soils meeting the <br />following criteria: <br />Minimum Placement Minimum <br />Construction Unified Soils Class and Compaction Testing Testing <br />Zone Requirements Requirements Requirements Interval <br />Zone 1 CH, CL, SC, SC-GC, CL-CH 95°k of ASTM D698 Density try nuclear Each 1,000 yds3 <br /> gage, ASTM D2922 <br />Minimum PI = 12% <br /> Density by sand cone, Each 10,000 yds3 <br />35% or greater passing the ASTM D1556 <br />No. 200 sieve <br /> -200 sieve, ASTM Each 10,000 yds3 <br />No more than 40% retained D1140 <br />on the No. 4 sieve <br /> Atterberg limits, ASTM Each 10,000 yds3 <br /> D424 <br />