20041111 Ver 3_Staff Comments_20130402

Lucas, Annette
From: Lucas, Annette
Sent: Tuesday, April 02, 2013 10:50 AM
To: Smith, Cherri L
Subject: 04 -11110 Brightleaf at the Park
Attachments: 04 -11110 Brightleaf at the Park. docx
Hi Cherri,
Here are two conditions for this project.
A
Annette M. Lucas, PE
Environmental Engineer
NCDENR I DWQ I Wetlands and Stormwater Branch
1650 Mail Service Center, Raleigh, NC 27699 -1650 (Mail)
512 N. Salisbury St, Raleigh, NC 27604 1 9th Floor (Location & Parcels)
Phone: [phone] Fax: [phone] Email: Annette. Lucas(@ncdenr.gov
- Website: http: / /portal.ncdenr.org /web /wq /swp /ws,.,/401
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04 -11110 Brightleaf at the Park
AML comments
April 2, 2013
1. Stormwater Management Plan (SMP) Approval From Local Community Required
You are required to provide one copy of the approved SMP, including plan details on full -sized plan
sheets, with proof of the city of Durham's approval. The approved SMP must be submitted to the
DWQ Webscape Unit (1650 Mail Service Center, Raleigh, NC 27699 -1650) before any impacts
authorized in this certification occur. The following requirements also apply:
• The approved SMP must be constructed and operational before any permanent building or
other structure is occupied at the site.
• The approved SMP as well as drainage patterns must be maintained in perpetuity.
• The SMP may not be modified without prior written authorization from the city of Durham. A
copy of the approval letter and the modified SMP must be submitted to the DWQ Webscape
Unit prior to the commencement of the modifications.
2. Diffuse Flow
All stormwater that is not treated by a BMP that removes a minimum of 30% Total Nitrogen and
Total Phosphorus shall be directed and maintained as diffuse flow with an engineered level spreader
through the protected stream buffers such that it will not re- concentrate before discharging into a
stream. If this is not possible, it may be necessary to provide an engineered level spreader or
stormwater facilities to remove nitrogen and phosphorus prior to discharge. If deemed necessary,
these facilities will require additional approval from the DWQ.