20120077 Ver 1_Staff Comments_20120220

Lucas, Annette
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Lucas Annette
Monday February 20 2012 2 09 PM
Witherspoon Lauren
Lucas Annette
12 0077 Del Webb — Durham
12 0077 Del Webb — Durham docx
Annette M Lucas PE
Environmental Engineer
NCDENR ( DWQ I Wetlands and Stormwater Branch
1650 Mail Service Center Raleigh NC 27699 1650 (Mvl)
512 N Salisbury St Raleigh NC 27604 1 911 Floor (Lo( ition & Pii(els)
Phone [phone] Fax [phone] ( Email Annette I UC.d"dI- ICdenI o-,
Websrte http / /portal ncdenr org/web /wqf aVt-J § /401
b,A Betore pi intin& this envul plerse consider your btfd,.?,f a0d the*0wironment
E mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties
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12 0077 Del Webb — Durham
AML comments
February 20 2012
Please provide all of the required items for each proposed level spreader as listed on the LS VFS
Supplement Form including plans plan details section views construction sequences and
operation and maintenance agreements
The BMP Manual requires a LS VFS at the outlet of a BMP only if it does not achieve 30%
removal of total nitrogen and total phosphorus In Durham s highly erodible soils it may be
preferable to discharge appropriately treated stormwater directly adjacent to the receiving
stream than risk the possibility of erosion in the protected stream buffer downslope of the LS
VFS
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