2014-378 Planning - J. F. Wilkerson Contracting for Morinaga America Infrastructure Improvements $747,840

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application of more-stringent management practices if it is determined that the additional ' requirements are needed to assure compliance with the federal or state impaired-waters conditions. If a discharge covered by this permit enters a stream segment that is listed on the Impaired Stream List for sediment-related causes,and a Total Maximum Daily Load(TMDL) has been prepared for those pollutants,the permittee must implement measures to ensure that the ' discharge of pollutants from the site is consistent with the assumptions and meets the requirements of the approved TMDL. The Division of Water Quality 303(d)list can be found at:h ttp://h2o.enr.state.nc.us/tmdVGeneral 303d.htm/ ' 4.1 Sediment Basins Sediment basins and traps shall meet the following requirements: ' a) Outlet structures shall be utilized that withdraw water from the surface. b) For basins or traps that have a drainage area of less than 1.0 acre,draw-down designs specified in the Division of Land Resources or delegated local program requirements are acceptable. c) Chemical treatment , i) All treatment chemicals must be stored in leak-proof containers that,are kept under storm-resistant cover or surrounded by secondary containment structures designed to protect adjacent surface waters. ii) All treatment chemicals must be used in accordance with dosing specifications and application rates provided by the manufacturer,supplier and as specified by the Division of Water Quality. ' iii) The Permittee must only use chemicals that have been approved by the NC Division of Water Quality and posted on their"North Carolina Division of Water Quality Approved PAMS/Flocculants List"found on their web site at: http://portal.nedenr.or web/w /wq s/su. iv) The Perm ittee must route stormwater treated with polymers,flocculants,or other treatment chemicals through sediment trapping,filtering,and/or settling devices(s)to ensure adequate removal of sediment flocculent prior to discharge to surface waters. , d) Discharge requirement-Discharges must meet the statutory requirements of the Sediment Pollution Control Act and utilize the provisions of Section 6.74 of the Erosion and Sediment Control Planning and Design Manual to assure that buffers and vegetated areas will be used to reduce the potential for visible siltation outside of the 25%buffer zone nearest the land- disturbing activity. 5.1 Discharges to Special or Threatened Waters , a) Disturbed areas within one mile of and draining to waters where federally-listed threatened or endangered aquatic species are present shall be limited at any time to a maximum total area within the boundaries of the tract of 20 acres. These projects shall also use control measures that are designed,installed and maintained in accordance with criteria set forth in 1 SA NCAC 04B.0124—Design Standards in Sensitive Watersheds. The Division of Water Quality may require additional/alternative protection measures or require coverage under an individual Construction NPDES Stormwater permit. Other management practices may be acceptable if these designs are shown,by the applicant,to the satisfaction of the Director,to provide equivalent protection. b) Construction activities in High Quality Waters Zones require quicker ground stabilization provisions as specified in Section II.B.2.b.of the permit , SECTION III FRAMEWORK OF PERMIT COVERAGE , During the period beginning on the effective date of the permit and lasting until expiration,the Permittee is authorized to discharge stormwater associated with construction activity including clearing,grading and excavation activities resulting in the disturbance of land and related support activities. Such discharges shall be controlled,limited and monitored as specified in this permit. Page 8 of 16 ,