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1 '. <br />• - 13 - <br />' high water elevation within 200 feet of the embanJanent. 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 ctit%f ill balance, it could be mixed in a <br /> 1 to 5 ratio with natural soils. All vegetation should be stripped <br /> rior to <br />ho <br />ld be a <br />roved <br />i <br />t <br />ti <br />d <br />ll <br />i <br />i <br /> pp <br />p <br />or <br />o excava <br />on an <br />a <br />m <br />x <br />ng s <br />u <br />pr <br /> <br /> placement. <br /> Prior to fill placement, all fill, topsoil and soft pockets of <br />' soil should be cortpletely removed fmn the porn] area. in sloping <br /> areas steeper than 5:1 (horizontal to vertical) the ground surface <br />' should be benched to provide a level surface for fill placement. The <br /> exposed ground surface should the, be scarified at least 6 inches and <br />1 t <br />i <br />t <br />d <br />i <br />i <br />9 <br />f <br />d <br />d <br />d <br />i <br /> a mo <br />s <br />ure <br />co~acte <br />to a m <br />n <br />mum <br />stan <br />ar <br />Proctor <br />ens <br />ty a <br />58 o <br />' content near optimum. <br /> See e: We have assumed the embanimients will be constructed <br />' primarily of on-site clays or very silty to clayey sands and silts <br /> which are relatively impervious when co~acted to the specified <br /> density. Granular zones encountered during borrow excavation should <br /> be selectively stockpiled and utilized in the downstream outer shell. <br /> Results of permeability tests are presented in Table II. <br /> For tertg~orary storage conditions and construction of an impervi- <br /> ous embanlanent 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 />' rovided to interce <br />t <br />d a blanket and tce drain be <br />l <br />d <br /> p <br />p <br />, we recommen <br />p <br />anne <br />' potential seepage and lower the line of saturation. The blanket <br /> <br /> <br />