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120 -6 . 2 . 3 Placing on Steep Slopes : When constructing an embankment on a hillside sloping more than 20 degrees from the horizontal , before starting the fill , deeply plow or cut into steps the surface of the original ground on which the embankment is to be placed . 120 -6 . 2 . 4 Placing Outside Standard Minimum Slope : Where material that is unsuitable for normal embankment construction is to be used in the embankment outside the standard minimum slope ( approximately one to two ) , place such material in layers of not more than 18 inches in thickness , measured loose . The Contractor may also place material which is suitable for normal embankment , outside such standard minimum slope , in 18 inch layers . Maintain a constant thickness for suitable material placed within and outside the standard minimum slope , unless placing in a separate operation . 120 -6 . 3 Hydraulic Method : 120 -6 . 3 . 1 Method of Placing : When the hydraulic method is used , as far as practicable , place all dredged material in its final position in the embankment by such method . Place and compact any dredged material that is rehandled , or moved and placed in its final position by any other method , as specified in 120 - 7 . 2 . The Contractor may use baffles or any form of construction he may select , provided the slopes of the embankments are not steeper than indicated in the plans . Remove all timber used for temporary bulkheads or baffles from the embankment , and fill and thoroughly compact the holes thus formed . When placing fill on submerged land , construct dikes prior to beginning of dredging , and maintain the dikes throughout the dredging operation . 120 -6 . 3 . 2 Excess Material : Do not use excess material placed outside the prescribed slopes , below the normal high -water level , to raise the fill . Remove only the portion of this material required for dressing the slopes . 120 -6 . 3 . 3 Protection of Openings in Embankment : Leave openings in the embankments at the bridge sites . Remove any material which invades these openings or existing channels without additional compensation to provide the same depth of channel as existed before the construction of the embankment . Do not excavate or dredge any material within 200 feet of the toe of the proposed embankment . 120-7 Compaction Requirements . 120 -7 . 1 Moisture Content : Compact the materials at a moisture content such that the specified density can be attained . If necessary to attain the specified density , add water to the material , or lower the moisture content by manipulating the material or allowing it to dry , as is appropriate . 120 -7 . 2 Compaction of Embankments : 120 -7 . 2 . 1 Earthwork Category 1 and 2 Density Requirements : Reduce the minimum required density from 100 % to 95 % of AASHTO T99 Method C for all earthwork items requiring densities . 120 -7 . 2 . 2 Earthwork Category 3 Density Requirements : Except for embankments constructed by the hydraulic method as specified in 120 - 6 . 3 , and for the material placed outside the standard minimum slope as specified in 120 - 6 . 2 . 4 , and for other areas specifically excluded herein , compact each layer of the material used in the formation of embankments to a density of at least 100 % of the maximum density as required by AASHTO T 99 , Method C . Uniformly compact each layer using equipment that will achieve the required density , and as compaction operations progress , shape and manipulate each layer as necessary to ensure uniform density throughout the embankment . 120 -7 . 2 . 3 Compaction Over Unstable Foundations : Where the embankment material is deposited in water or on low swampy ground , and in a layer thicker than 12 inches 25 Technical Specifications F :\Public Works\ENGINEERING DIVISION PROJECTS\0744-8th St- US1 to 6th Ave\Admim\bid documents\0744 CONTRACT DOCUMENTS\Technical Specifications . doc