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- 13 - <br />high water elevation within 200 feet of the embankment. Cut slopes • <br />should be evaluated for stability. <br />Topsoil has excessive organic matter to be used for borrow. If <br />this material is needed for cut/fill balance, it could be mixed in a <br />1 to S ratio with natural soils. All vegetation should be stripped <br />prior to excavation and all mixir~; should be approved prior to <br />placement. <br />Prior to fill placement, all fill, topsoil oral soft pockets of <br />soil should be completely rerroved faun the pond area. In sloping <br />areas steeper than 5:7 (horizontal to vertical) the ground surface <br />should be benched to provide a level surface for fill placement. The <br />exposed ground surface should then be scarified at least 6 inches arxi <br />cormsacted to a minimsn 958 of standard Proctor density at a moisture <br />content near optimum. <br />Seepage: We have assumed the e~ankments will be constructed <br />primarily of on-site clays or very silty to clayey sands and silts <br />whidi are relatively impervious when coaQacted to the specified <br />density. Granular zones encountered during borrow excavation should <br />be selectively stockpiled aril utilized in the downstream alter shell. <br />i?esults of permeability tests are presented in Table IZ. <br />Ebr tengorary storage conditions and construction of an impervi- <br />ous embarilanent section within the upper plateau area, no tce drain or <br />interior drainage appears necessary for low impoundment depths. For <br />impoundment depths greater than 15 feet and where permanent storage is <br />planned, we reo~mnend a blanket and tce drain be provided to intercept <br />potential seepage and lower the line of saturation. The blanket <br /> <br /> <br />