Agenda - 05-21-1991 - Laserfiche WebLink

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3. Where a kM22M and minimal disturbance is 2EMitted as an exqMgtion by Section 8 a 1 of this ordinance land- disturbin activities in the buffer zone adiacent to designated trout waters shall 9 L* limited to a maximum of 10 of the total length Qf the Lw zone MdflIja the tract to be batted such that there is not mom than 100 feet -of disturbance in each 1000 linear feet of buffer . I er areas ma be disturbed with the written NMMval of the Director of the Divi ' of Land Resources of the D arttnent of Environment, ealth and Natural Resources. 4. No land-disbmbing activity shall be undertaken within a buffer zone ad'acent to desienaW trout waters that will cause adverse temperature fluctuations as set forth in 15. NCAC 28.0211 Fresh Surface Water Classification and Standard4, in these waters. C0AfiWFVTlRY.• The buffer requirement has been revised and strengthened for trout waters. Deere are no trout waters in Orange County; however, according to the staff of the Sedimentation Control Commission, the references must be included for the Ordinance to conform to the State's Model. c. Ground Cover Whenever land- disturbing activity is undertaken on a tract comprising more than 20,000 square feet, if more than 20,000contiguous square feet are uncovered, the person conducting the land disturbing activity shall install such sedimentation and erosion control devices and practices as are sufficient to retain the sediment generated by the land-disturbing activity within the boundaries of the tract during construction upon and development of said tract, and shall plant or otherwise provide a permanent ground cover sufficient . to restrain erosion after completion of construction or development. Ez as _provided in Section 8 (d) (2) (e) of this ordinance, provisions for a ground cover sufficient to restrain erosion must be accomplished within 30 working days or 120 calendar days, whichever period is shorter, following completion of co struction or develo meat. COMME11fTlRY.• This change highlights the exception in the amendment to 8 (d) (2) (e) requiring faster stabilization in High Quality Water zones. d. Design and Performance of Control Measures 1. Except as proyjlded in Section 8 d 2) (b) of this Ordinance- and in the standard for sediment Rgg.ds in the Soil Erosion and Sediment Control Manual grosion and sedimentation control measures structures and devices shall be so Tanned ed and constructed as to provide rotecti from accelerated emsion and sedimentation from the calculated maximum Bak rates of nMff from the ten- ear ftguency storm. Runoff rates shall be calculated using the procedures in the USDA Soil Conservation Services National Engineering Field Manual for Conservation Practices, or other calculation procedures acceptable to the Erosion Control Officer. 2. In Mgh Qgdja water MM zones the following dgji gm standards shall Mply. a. Uncovered main W zones shall be limited at an time to a maximum total area of 20 acres 2dthin the boundaries of the tract. the RgIfion of the land-disturbing activily within, W zone shall be &0@MjLd b this section. Lar er ma be uncovered within the es of the tract with the written roval of the for of the Division of Land Resources of the Department of _Environment. Health, and Natural Resources. b. Emakagn and sedimentation contra measures structures and devices within HOW zones shall be so Rlanned, desiZago, and constructed to RE2vide 2MWfion from the runoff of the 25- ear do rm 3wj)ich Broduces the maximum Mk rate of runoff. The 2gk rate of runoff shall be calculated according to in dxe United States RgWment o A 'culture Soil Conservation Service's National Engineering Field Manual or Conservation Practices or according to procedures ado ted by-an other aMcl of this state or the United States or M Le&eralLy reconigg organization or association. L. Sediment R9nds also called "sediment basins" W zones shall be desi ed and constructed such that the Rqnd will have a settling efficiency of at least 70 for the 40 micron 0.04 size soil Micle transported into the basin by the Eunoff of that 2-year 4 5 -9 -91