HYDRO27734 - Laserfiche WebLink

Home Browse Search

layer thickness may be authorized by the Engineer. Each Layer shall be leveled and smoothed with suitable leveling equipment and. by distribution of spalls and finer fragments of earth. If a situation exists wherein the above method of construction is not practicable the Engineer may per- mit rock fill material to be cast or end dumped. In such case sufficient hand or machine work will be required to construct a compact, stable fill and to finish the slopes to a neat, workmanlike appearance. Embankments consisting predominantly of rock larger than 8" in greatest dimension; either placed in layers, cast, or end dumped, shall not be con- structed above an elevation 6 inches below the finished grade. The balance of the embankment shall be composed of suitable material smoothed and placed in layers not exceeding 8 inches in loose thickness and com- paaced as specified for embankments. Frozen materials shall not be used in construction of embankments. During the construction of the dam, the embankment shall be maintained in such condition that it will be well drained at all times. 203.09 Construction of Embankment and Treatment of Cut Areas with Moisture and .Density Control All embankments other than rock embankments are to be constructed with moisture and density control. The moisture content of t'he soil at the time of compaction shall be as specified or directed. Within the areas indicated for construction on the plans, earth shall be thoroughly scarified and the moisture content increased or reduced, as necessary, to bring the moisture content to speclfications. This scarified layer shall then be compacted to the relative compaction spe- cified. The remainder of the area up to the top of the embanlanent shall be constructed of suitable material placed at the moisture content specified and compacted to the percent relative compaction specified. All material in embankments designated on the plans shall be compacted to the specified relative compaction. Fill material shall be placed in layers not exceeding eight inches in thickness and compacted to at least 95 percent of Standard Proctor dry density (ASTM D-698). The .f ill shall be free from lenses, pockets, and streaks or layers of material differing substantially in texture or gradation from the surrounding material. Fill shall no L' be placed upon a frozen surface, nor shall snow, ice, or frozen material be incorp- orated in the fill. Any surface that becomes too hard and smooth for adequate bonding with the succeeding layer shall be scarified parallel to the axis of the fill to a depth of not less than 3 inches. A lift shall not be covered by another lift until compaction complying with the above requirements is obtained.