20190121 Ver 1_Layhill Estates Subdivision C&R_20190313

Layhill Estates Subdivision
Stephanie Z. Goss
Environmental Senior Specialist
Division of Water Resources
Raleigh Regional Office
3800 Barrett Drive
Raleigh, NC 27609
919-791-4256
RE: Layhill Estates -Outfall permit in Neuse Riparian Buffer(C&R)
Comments from Stephanie Z. Goss, DWR:
IC ENGINEERING I N C
I am currently in the process of reviewing the above referenced project and the following
information is required in order to finish the review process:
• The buffer impacts requested in this application need to be clearly shown and enumerated
on the site plan. These impacts need to correspond and match the impacts requested in
the application. [ 15A NCAC 02H .0502(g)]
• A Buffer Impacts plan sheet has been attached to this Comment and Response Letter.
These impacts correspond and match the impacts requested in the revised
application. (Also attached)
• Please provide details that nutrients are reduced before the conveyance discharges
through the buffer. According to sheet no. C-5.2 the drawing depicts the proposed
SCM as dry detention. According to the Neuse River Basin table of uses, new
stormwater outfalls that do not provide control for nitrogen are prohibited. [I 5A
NCAC 0213 .0233 [6)]
The Stormwater Design spread sheet from wake county(WakeCountyStormwaterDesignTool)that
shows the nutrient removal, has also been attached.
• According to sheet no. C-6.00 I noticed an onsite septic area in Zone 2 of the riparian
buffer. According to the Neuse River Basin table of uses, new on-site sanitary sewage
systems that use ground absorption are prohibited in the riparian buffer. [ 15A NCAC
02B.0233 [6)]
• I have plotted a septic sheet(c-6.0) attached. with the Swift Creek Water Supply Buffer layer
turned off, showing the 50'(zone 2) NRB , and I don't see anything related to the comment above.