20110718 Ver 1_Staff Comments_20111020

Lucas, Annette
From: Lucas, Annette
Sent: Thursday, October 20, 2011 10:52 AM
To: Witherspoon, Lauren
Cc: Lucas, Annette
Subject: 11-0718 UNC Hospitals - take 2
Attachments: 11-0718 UNC Hospitals.docx
Lauren,
Here are the bullets. Hopefully the next submittal will be in compliance with buffer rules.
Thanks,
Annette
Annette M. Lucas, PE
Environmental Engineer
NCDENR DWQ ( Wetlands and Stormwater Branch
1650 Mail Service Center, Raleigh, NC 27699-1650 (?til hh i l)
512 N. Salisbury St, Raleigh, NC 27604 1 91h Floor (I tiurt (% Parcels)
Phone: [phone] Fax: [phone] Email: Annette. 1,uW_Iti i'J(I I LA
Website: http://portal.ncdenr.org/web/wq/swp/ws/401
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11-0718 UNC Hospitals - take 2
AML comments
October 20, 2011
1. Per the phone conversation between Chad Abbott and Annette Lucas on October 18, 2011, please
provide Filterra devices at the four inlets that serve the driveway from Waterstone Drive.
Per the requirements of the Neuse Riparian Buffer Rule, the outlet that discharges the runoff from
the Central Utility Plant and the Equipment Yard must meet diffuse flow requirements. Level
spreader-vegetated filter strip (LS-VFS) design requirements are set forth in Chapter 8 of the
North Carolina Stormwater BMP Manual, available at:
http://portal.ncdenr.org/web/wq/ws/su/bmp-manual. If it is not practical to install a LS-VFS to
serve this outlet, then please provide another BMP that removes a minimum of 30% of the Total
Nitrogen (TN) and Total Phosphorus (TP) from the stormwater generated by these areas. If you
have any questions, please contact Annette Lucas at [phone].
3. Please provide a BMP Supplement Form for each proposed best management practice that will be
used on the site (including both the Design Summary and Required Items Checklist), as well as
all of the required items. The BMP Supplement Forms are available on the DWQ web site at:
http://portal.ncdenr.org/web/wq/ws/su/bmp-manual.
4. Please be advised that all future phases of this site will also be required to meet Neuse Buffer
Rule diffuse flow requirements via either a BMP that removes 30% of TN and TP or a properly
designed LS-VFS.