Laserfiche WebLink
ftv. :3|?-,-i <br />I existing material. Clean dirt fill should <br />5t not have any depressions or bumps <br />3amy topsoil for the vegetative cover. <br />^graded to slopes no greater than 1 on <br />tending the regraded slope at the toe, <br />acting a retaining v^ail at the top of the <br />ong the toe of all affected slopes and <br />polyethylene perforated tubing Is <br />line and grade in a trench excavated <br />d spaces between the tubing and the <br />1 ends to provide outlets. Except for <br />Unal graded surface. A rodent guard <br />e <br />the regraded slope. The retaining wall <br />J not exceed five feet in height. Six-inch <br />3 walls using specifications cited above, <br />jn as the bottom of the exposed wall and <br />An engineer must be consulted for the <br />tructures. <br />jnka, Minnesota 55343 Telephone (612) 544-8572 <br />.. -V • ■ ■■V- \.m- . V- ■ ■ •: v-'.v <br />■.fT = <br />.’ 4 -V •.'• ■ 1 <br />,.u <br />'&*■ <br />La . <br />■ M <br />!11 <br />Si/; <br />Im <br />■f! <br />.'•-V'ZirZ'■'y,' <br />■ ^i0Ji$ <br />wm : i#- <br />»» V. . <br />m. <br />I % <br />^z: ■ <br />zmrnzmmmsmmm mm/■;v#vV''-,.vZrZy - V ■••. • •' • .• • . • ■• • : * .*. : -I.': ..••‘V.•: . :•• ■ •: ■••■ .• ■= '•■• i- :• <br />* i <br />wk m2.Q PrevePfionFuture ero^ problerns can be prevented by Ksntrolfing three fictoft: 1) <br />a^toage: 2) surface runoff from tawns and yards; and 3) seepage erf ground <br />toe toes of steep irfepes and at frie base of ret^ntog walls. <br />ei.elite <br />fto(A should be guttered and the drftnege dfreded. as much as possible, toward <br />toe street Whsr s gradtog permtts, rooftop dratoege from toe rear <rf the hewse ctfi <br />be carried to toe «reei in tiTafiow sitosuface drafra. to specie c»es, drains c«i <br />rooftop drainage down elope. Subsurface drains should be sbe-toen diametif <br />e^rugi^ed polyetoytewiaigflriQaJBd tobing. <br />Surface runoff from lawns, yards, or laiguttered portions of roofs must be> <br />controlled to mtolmizo water volwne end v^odty at any single poirrf. Landscaptog <br />should be modified to prevent channelling of surface water. Low walls cr berms can <br />be constructed along toe slope crest Water ponded behind the waHs must be <br />drained through sub* jrface storm sewers. Eight-inch diameter corrugated <br />polyethylene unp^tffnrated tubing can handle drainage from approximately 10,000 <br />square feat if it slopes greater than 1 on 2 (50% grade). Inlets must be protected <br />from trash, leaves, etc. Outlets must discharge onto riprap. Vents must be placed to <br />toe fine where there are significant changes to grade. <br />Many slope faflures are caused by excessive pressure exerted by ground water at <br />the toes of slopes. Subsurface drains running along the contour at the toes of slopes <br />and behtod retaining walls will relieve the excess pressure and prevent slumoing. <br />Standards for subsurface draias are given above. <br />3.0 Seeding and Mulching <br />It is important to develop a good vegetative cover on steep slopes as quickly as <br />posssible. The work to be performed for seeding disturbed areas includes: <br />W. ■ <br />;-,:•••/>v.'. ■■■A•J <br />zrmz <br />y-yK-Z <br />tMfiF'. <br />mm <br />. # <br />^ ..V <br />m <br />) <br />A' i <br />mz ^Z'zK':•' ■■'/; - . J <br />im >ZZ\Zf^ <br />mzz:ZfUz <br />'T^'^/ZZZi <br />%