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The Contractor shall be permitted to construct separate sections of the cutoff trench and embankment, <br /> subject to the approval of the Design Engineer. Construction of the cutoff trench and embankment shall be <br /> subject to the following conditions: <br /> A. Longitudinal bonding surfaces(surfaces parallel to the centerline crest of embankment)between <br /> previously constructed embankment and embankment to be constructed shall not be steeper than <br /> 2:1. <br /> B. At any cross-section,the difference in elevation between adjacent zones of the embankment shall <br /> be not greater than 3 feet,unless approved by the design engineer. <br /> C. Transverse bonding surfaces(surfaces perpendicular to the centerline crest of the embankment) <br /> shall not be steeper than 4:1. <br /> During construction of new earthfill,the Contractor shall adequately prepare the surface of previously <br /> constructed embankment zones,original embankment and transverse slopes by benching and/or scarifying <br /> in a manner acceptable to the Design Engineer to satisfactorily bond the new fill to the existing fill. <br /> 3.05 MOISTURE AND DENSITY CONTROL <br /> A. Cutoff Trench and Compacted Embankment Fill <br /> The Standard Optimum Moisture Content is defined as"that moisture content which will result in <br /> a maximum dry unit weight of the soil when subjected to the Standard Proctor Compaction Test as <br /> described by ASTM D698." Material represented by the samples tested having a placement <br /> moisture content less than two percent below standard optimum condition or more than two <br /> percent wet of the standard optimum condition will be rejected and shall be reworked until the <br /> moisture content is between these limits. Additional moisture as required in the opinion of the <br /> Design Engineer may be applied by sprinkling on the cutoff trench or embankment fill soils. <br /> Each layer of earthfill material shall be compacted as indicated in these specifications. During <br /> compaction,the placement moisture content and dry density of the earthfill shall be maintained <br /> within the control limits specified in each section. <br /> To determine that the moisture content and dry density requirements of the compacted earthfill are <br /> being met,field and laboratory tests will be made at intervals on samples taken at cutoff trench <br /> and embankment locations determined by the Mine Superintendent subject to approval by the <br /> Design Engineer. Density testing shall be by nuclear density gage. The results of all completed <br /> earthwork tests will be available to the Design Engineer within one hour for nuclear density tests <br /> and 24 hours for sand cone tests. <br /> Materials not meeting the specified moisture content and dry density requirements,as determined <br /> by the tests,shall be reworked until approved results are obtained. Reworking may include <br /> removal,rehandling,reconditioning,rerolling,or combinations of these procedures. <br /> The moisture content of the earthfill material prior to and during compaction shall be distributed <br /> uniformly throughout each layer of the material. As far as practicable,the materials shall be <br /> brought to the proper moisture content by adding supplementary water,if required,to the material <br /> by sprinkling on the earthfill and each layer of earthfill shall be conditioned so that the moisture is <br /> uniform throughout the layer. <br /> Density control of compacted earthfill shall be such that the dry density of the compacted material, <br /> as determined by tests performed by the Design Engineer,shall conform to not less than 95%of <br /> its Standard Proctor maximum dry density. Material which does not meet these requirements will <br /> be rejected and shall be reworked until a dry density equal to or greater than these requirements is <br /> reached. <br /> 6/10 Section 02290-Page 5 of 6 <br />