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3.04 PLACING AND COMPACTING EMBANKMENT MATERIALS <br /> The suitability of each part of the foundation for placing embankment materials thereon,and of all materials <br /> for use in 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 embankment on <br /> which it would be placed is frozen. <br /> No brush,roots,sod,or other perishable or unsuitable materials shall be placed in the embankment. Each load <br /> of the material placed in the embankment,whether from excavation for other parts of the work or from borrow <br /> pits,shall be placed in the location designated by the Engineer. Primary processing and blending of <br /> embankment soils shall be performed in the borrow area. Borrow processing and blending shall be <br /> accomplished with mechanical equipment until the embankment borrow soils are mixed to a consistent <br /> gradation meeting the specifications. <br /> The earthfill material shall be placed in the embankment in continuous and approximately horizontal layers,no <br /> more than 9"loose lift thickness. The combined excavation and placing operations shall be such that the <br /> materials will be sufficiently blended to secure the best practicable degree of compaction and stability. A disc <br /> will be required during placement of all embankment fill that consists of overburden or squeegee material. If <br /> material is clayey soils a disc may not be required. Each lift of placed embankment soil shall be thoroughly <br /> mixed and processed with sufficient passes of a disc to achieve a consistent gradation and moisture content <br /> before compaction. If a disc is required and/or determining if material is sufficiently blended shall be at the <br /> discretion of the Engineer. <br /> The Contractor shall maintain the embankment in an approved manner,including maintaining working <br /> surfaces free of weeds and other organic matter until final completion and acceptance of all the work under the <br /> contract. Water shall not be allowed to pond on the embankment. <br /> If,in the opinion of the Engineer,the surface of the prepared foundation or the compacted surface of any layer <br /> of earthfill is too dry or smooth to bond properly with the layer of material to be placed thereon,it shall be <br /> moistened and/or worked with harrow,scarifier,disc,or other suitable equipment, in an approved manner to a <br /> sufficient depth to provide a satisfactory bonding surface before the next succeeding layer of earthfill material <br /> is placed. If in the opinion of the Engineer,the compacted surface of any layer of the earthfill in-place is too <br /> wet for proper compaction of the layer of earthfill material to be placed thereon,it shall be removed,allowed to <br /> dry;or be worked with harrow,scarifier,disc,or other suitable equipment to reduce the moisture content to the <br /> required amount;and then it shall be recompacted before the next succeeding layer of earthfill material is <br /> placed. When each layer of material has been conditioned to have the specified moisture,it shall be compacted <br /> by passing the tamping roller over. The compacted density shall be essentially uniform throughout the layer. <br /> Self-propelled tamping sheepsfoot type rollers shall be used for compaction of embankment fill. The roller <br /> compactors shall be capable of effectively achieving the required density for the entire depth of the lifts being <br /> placed. Roller compactors shall be suitable for the material being placed,capable of rates of production which <br /> will not cause any delays to the progress of the work,and subject to the approval by the Engineer. <br /> The Contractor shall be permitted to construct separate sections of the embankment,subject to the approval of <br /> the Engineer. Construction of the embankment shall be 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 2:1 <br /> (h:v). <br /> B. Transverse bonding surfaces(surfaces perpendicular to the centerline crest of the embankment)shall <br /> not be steeper than 4:1 (h:v). <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 in a <br /> manner acceptable to the Engineer to satisfactorily bond the new fill to the existing fill. <br /> February 2016 Section 02290-Page 3 of 4 <br />