Agenda - 05-21-1991 - Laserfiche WebLink

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storm which Rmduces tbg maximum Rok rate of o - The mk rate of off shan be calculated rMrding to nEMgd M in the U 'red States Dandmol of AgTiculture So' Consery tion cs's ational n ineerin Field Manual for Conservation &acticej or 10 rd:m to RMgghM aftWd by My othq anacy of Ws state or tho United States or an tY recd tion or association. COALNEWLIRY.• The purpose of the change in the above paragraph is to require a higher level of sediment- trapping efficiency in High Quality Waters (refer to the definition in Section 3). For a number of reasons, however, this change has little practical impact in Orange County. (1) the amendment specifies improved performance for sediment ponds only, and, because of the type of development that usually occurs in these rural HQW, it would be unlikely that a sediment pond would be used; (2) existing standards in the Erosion Control Manual require both sediment ponds and sediment traps (which are most often used in these areas) to be designed and constructed to a greater efficiency than this amendment requires; and (3) the standards in the Manual apply not only to HQW but to all of Orange County and Chapel Hill. d. Newly constructed 9M channels in HOW MGM shall be desi ed and constructed with side slope�t no steeper than 2 horizontal to --I vertical if a vegetative cover is_used for stabilization unless soil conditions RRrmit a Ltqjper sIgN or where the SI9M are stabilized by using mechanical devices structural devices or other table devices. In any event the angle for side sigm shall be sufficient to restrain accelerated erosion. e. 9-Lound cove sufficient to restrain erosion must be provided for any portion of a land - disturbing activity, in a HOW zone within 15 working days or 60, calendar days. whichever RLrjod is shorter, followin coMWetion of mnstructian or development. COA"ff"ARY.• These amendments were adopted by the Legislature to provide additional protection for High Quality Waters. The revision concerning sediment ponds in Section 8 (d) (1) is a change proposed by the staff. "Sediment pond " is used instead of "sediment basin " because it is the term used in the Erosion Control Manual. Section 9 Stormwater Outlet Protection action of Stream Banks and Channels C0A"ff- MARY.• To clarify the intent of this section, the title has been changed . or elarelepment— if eanditiom 0) and (ii) of this peiagiVh C=wt be nwt, the ehmtad below Ow diwhwge point shaft C0M MWARY.• The text above will be deleted and replaced by the text below. 5 5 -9 -91