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� <br />I� <br />� <br />� <br />' <br />i <br />� <br />�J <br />� <br />� <br />� <br />� <br />� <br />� <br />� <br />� <br />� <br />' <br />' <br />installed at each reservoir with riprap armor protection on the upstream slopes of the <br />reservoir. <br />The jurisdictional classification of the upper reservoir requires that the dam and the <br />appurtenant structures be designed and constructed in accordance with the Rules and <br />Regulations for Dam Safety and Dam Construction. The lower reservoir, although <br />classified as a non-jurisdictional dam, will be designed and constructed in the same <br />manner as the upper reservoir. <br />As part of the requirements to the State, a comprehensive drainage report will be <br />provided under separate cover at the time the plans and specifications are submitted for <br />State review. AEI's drainage report methodology has been approved by the State <br />which indicates a drainage area of approximately 8.5 square miles and a 100-year <br />storm runoff of 200 cfs. The overflow spillways have been designed to pass the 100- <br />year storm event. <br />Lower reservoir plans and profiles have not been finalized due to the current lack of <br />survey data. At such time as the interior of the pond and its appurtenances can be <br />surveyed, the plans and profiles will be completed. Anticipated construction costs have <br />been conservativelv estimated based on the limited survey data which is available and <br />the similarities of the construction efforts which will be involved between the upper and <br />lower reservoirs. <br />IV. Embankment Reconstruction <br />A. Embankment Geometry: The upstream slopes for each reservoir will have <br />minimum sideslopes of 3:1 (horizontal to vertical) and downstream slopes no <br />steeper than 2.5:1. The dams will have 3-feet of freeboard and a crest width <br />of 6-feet. The crest of the dams will be graded to provide positive drainage <br />toward the reservoir. <br />B. Toe Drains: Toe drains will be installed at each reservoir. The toe drain will <br />be placed near, but beneath the downstream toe of the embankment. The <br />drain will be excavated in a trench parallel to the toe and at least 6-feet inside <br />the toe, beneath the embankment. A non-perforated PVC outfall line will be <br />provided. <br />C. Rock Riprap: Riprap will be provided on the upstream slopes of the <br />reservoirs. The riprap will be 8-12" and will be placed on an impermeable <br />hypalon liner. Riprap will be placed at the outlets of the 18-inch HDPE <br />culverts and in the drainage channels downstream of the overflow spillways. <br />D. Embankment Construction: The embankment will be constructed of suitable <br />soils removed from the dam when the existing CMP culverts are removed. <br />The embankment will be constructed in horizontal lifts that extend from <br />abutment to abutment. Rocks encountered in the fill will not be allowed to <br />form coarse open-graded pockets. Rocks greater than 8-inches will not be <br />2 <br />