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Qne <br /> No land-disturbing activity shall be perm teed <br /> a. 'S..,uffer Z i-Ali natural. watercourse unless a buffer <br /> in proxy to a jalke or <br /> zone i.s i:>rovided along the margin of the vratercourse of <br /> ble siltation within the twent <br /> Suffpc ient width to confine visi s-urbi <br /> five r::ent (25%) of the buffer zone nearer the land-di , <br /> activity Provided, that this subsection (a) shall not apply <br /> , <br /> to tan -disturb over , or -under a <br /> ' a bing activity in connection With the con- <br /> struction of facilities to be located on, <br /> la),-e o)c: natural watercourse. <br /> tapes and Fills angle for graaed slopes and <br /> b, Graded S which can be retdine <br /> o grey <br /> F _ter than the angle <br /> falls shall ther adequate , troj devices <br /> 3 <br /> b vege ative cover _or 0 withi <br /> Y any event-, slopes left. exposed Will, <br /> or stru In e of grading, be <br /> I g days of completion of any phas <br /> .30 .,,O-r%'n otherwise provided 'with ground cover., devices"':0r: <br /> planted. or <br /> strac a es sufficient to restrain erosion. <br /> over - Whenever lafid-airsturbing activitY is unaertaRrz <br /> C. Ground -119 more than one acre, if more than one cc <br /> ct �Tomprisi vegetation or„.ot-hE <br /> guolls alre is uncovered, a, ground cover of <br /> means S�ffjcient to restrain erosion must 'be provi,ded within <br /> L of the -tract upon which -fart] <br /> 30 worR- ng days on that portion , <br /> s not being provided, that <br /> active LonstructiOn i a forming <br /> is sifisection (c) shall not apply to cleaxea Ian . <br /> phis the basin of a res ervoir later to be inundated. <br /> a. a Performance of Control Measures - Erosion aDd <br /> Design an :�-t�ructu_res, and devices shal <br /> g�ed5er1Ua­t1_6n__control measures, L� to proviae contr <br /> be so planned, e sified, and cnsructed osion and sedimentation from �the calculated <br /> of accelerate3� year frequency storm- Ruribf <br /> peak rates of runoff from a ten- DA, <br /> rates zhall be calculated using the procedures in the US <br /> Soil Conservation Service' s, "National Engineering Field <br /> Manual for Conservation- Practices," or other calculation Prc <br /> cedures acceptable to the Erosion Control officer. Runoff <br /> CoMpUtations shall be based on rainfall data published by t-I <br /> Nation- I Wea her Service for the area. <br /> Section 9 P ermanent Downstream Protection Of Stream .Banks and <br /> , <br /> Channels <br /> provision hall be viade for the permanent. protectieffects on of oincreased <br /> f off-Sit, <br /> Stream banks and channels frcm the erosive <br /> Vejo&jty and volume Of Storm water r unoff resulting from tartan <br /> land-disturbing activities- <br /> , ation storage ancl controlled release of storm wa <br /> a. A com in 'M tndustrial, educat <br /> 15 ed for coml ercialt _� <br /> re�ioff shall be requi- onments of one acre or more; for mul <br /> and institutional devel .- J_ <br /> -fRrni1v residential developments of.1 one-a6re or-1 more;_.andr f <br />