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<br /> 1 streams Carrboro al.sa has standards for intermittent st een. - ' 'Y'..
<br /> iahereas the County does not.
<br /> { A-10 !i
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<br /> land-disturbing activity in connection with the construction of
<br /> facilitiesito be located on, over, or under a lake or natural
<br /> watercourse.
<br /> b. Graded Slopes and Fills-- the angle for graded slopes and fills
<br /> shall be no greater than the angle which can be retained by I
<br /> vegetativelcover or other adequate erosion control devices or struc- .e
<br /> tures. In any event, slopes left exposed will, within 30 working f
<br /> days of completion of any phase of grading, be planted or otherwise i'
<br /> provided with ground cover, devices, or structures sufficient to ;l
<br /> restrain erosion.
<br /> c. Ground Cover - whenever land-disturbing activity is undertaken
<br /> on a tract comprising more than 20,000 square feet, if more ,
<br /> than 20,000;contiguous square feet is uncovered, the person
<br /> conducting the land-disturbing activity shall install such 4'
<br /> sedimentation and erosion control devices and practices as are
<br /> sufficient to retain the sediment generated by the land-disturbing
<br /> activity within the boundaries of the tract during construction
<br /> upon and development of said tract, and shall plant or otherwise � '
<br /> provide a permanent ground cover sufficient to restrain erosion
<br /> after completion of construction or development within 30 working
<br /> days or 120 calendar days following completion, whichever period
<br /> is shorter. (Amended effective (April 8, 1980).
<br /> d. Design and Performance of Control Measures - erosion and
<br /> sedimentation control measures, structures, and devices shall be so l `I
<br /> planned, designed, and constructed as-to provide control of
<br /> accelerated erosion and sedimentation from the calculated peak
<br /> rates of runoff from a ten-year frequency storm. Runoff rates
<br /> shall be calculated using the procedures in the USDA, Soil
<br /> Conservation Service's, "National Engineering Field Manual for
<br /> Conservation Practices," or other calculation procedures acceptable
<br /> to the Erosion Control Officer. Runoff computations shall be based .K 1 i
<br /> on rainfall data published by the National Weather Service for `
<br /> the area.
<br /> ti:on 8.1 Add t onat Stand,ande aor Land-tgetubing Actcuity in Uuv enaity Laze Watenahed
<br /> The ptavi,4.ion4 oS Section 8 4ha e.E apply to Land-di4tmb.Lng activity within. I;
<br /> the Univer4i,ty Lake ft)aWti,hed. in addition, the de4ign, catt4trt.uction, and
<br /> maintenance ob dra•inage, 4yetem4 .iii deveC.opmenta within the Univet4ity Lake
<br /> W tee4hed 4h tt aZ4o be cone.ietent with the SIottotmalg 4.tandarde, and theee
<br /> 4tandatd4 4haet eonttct to the extent that they are mote reettictive than tho4e 4et 5onth in Section 8.
<br /> a. Channe.ci4 Runolf(t - ehanneting &uno66 di.tectCy .alto watch bodie4 4hacC
<br /> be pat,alub.cted. k Runo4U ahatt be 'touted .•tivtough 4uatc4 and o..theft
<br /> 4y4teme de4tgned to inc,teaae time o>S coneen-tAat.ion, deatea4e
<br /> ve4ority, •inetea6e indietha,ti;on, aCCow 4u4pendcd 4otids to 4ettCe,
<br /> and herove pot2u.tattt4,
<br /> }
<br /> b. A Clem t.%an o4 W tc t courts e4 - natu.taC wztet come e s 4 ha.C.e not be
<br /> dte.dged, eteared o6 vegetation, deepened, widened, 4tta.iglt.tened,
<br /> etabi.Z.i.ced oh ethehuiee aCtered except in accordance with an
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