19980382 Ver 1_More Info Requested_20160603

Strickland, Bev
From: Larsen, Cory
Sent: Friday, June 03, 2016 2:41 PM
To: 'John Vilas'; Price, Zan (George)
Cc: Leslie, Andrea J; 'Elliott, William A SAW'; Bob Grasso ([e-mail])
Subject: RE: Request for Additional Information - Poplar Ridge Lot 126 - Buncombe County -
DWR 98-0382 V2
John
I've reviewed the additional information and have the following comments that will need to be addressed:
There are a number of inconsistencies between values shown on Table 1 of the supplement form, the SMP site plan
and detail drawings, and the calculations sheet. Please revise as necessary for consistency;
Please modify the swales to ensure a flow velocity of less than or equal to 2 feet per second (current design is for
2.1 fps and 2.4 fps on swales 1 and 2, respectively). Two feet per second is considered the maximum non-erosive
velocity for this review;
For swale 1, the calcs indicate a bottom width of 6 ft and top width of 7.5 ft and side slope of 3:1. Swale 2 calcs
similarly indicate bottom width of 8.5 ft, top width of 10 ft and side slope of 3:1. A 3:1 side slope is not possible
with the given dimensions. Please provide clarification or revise.
Thank you.
Cory Larsen, PE
Stormwater Engineer
401 & Buffer Permitting Branch
NCDEQ — Division of Water Resources
919.807.6379 office
cory.larsena-ncdenr.gov
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
}:
Nothing Compares
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: John Vilas [mailto:[e-mail]]
Sent: Thursday, June 02, 2016 1:04 PM
To: Price, Zan (George) <[e-mail]>
Cc: Leslie, Andrea J <[e-mail]>; 'Elliott, William A SAW' <[e-mail]>; Larsen,
Cory <[e-mail]>; Bob Grasso ([e-mail]) <[e-mail]>
Subject: RE: Request for Additional Information - Poplar Ridge Lot 126 - Buncombe County - DWR 98-0382 V2

Za n,
In response to your Request for Additional Information dated May 13, 2016, we have prepared a stormwater
management plan for the site that shows how the low density criteria are satisfied.
Attached is a stormwater management plan for Lot 126 and a Low Density Supplement Form. The approach is to
discharge all roof gutter drains and sheet flow from the upper part of the driveway into the grassed yard area around
the house. This water will collect and be conveyed off-site through broad grassed swales. These swales have longitudinal
slopes greater than 10% but we calculated 10 -yr. velocity and sheer stress (tractive force) and both will easily handle the
10 -yr. flow. Runoff from the lower portion of the driveway will sheet flow directly to grassed areas or natural forested
areas.
Please let me know if you have any questions or require additional information.
Thank you,
John
John Vilas
Program Services Manager - Environmental
qMcGiH
468 New Market Blvd. Suite B I Boone, NC 28607
Phone: [phone] Cell: 828.964.3962 1 Fax: [phone]
[e-mail] I www.mcgillengineers.com
From: Price, Zan (George) [mailto:[e-mail]]
Sent: Friday, May 13, 2016 11:17 AM
To: John Vilas<[e-mail]>
Cc: Leslie, Andrea J <[e-mail]>; 'Elliott, William A SAW' <[e-mail]>; Larsen,
Cory <[e-mail]>
Subject: Request for Additional Information - Poplar Ridge Lot 126 - Buncombe County - DWR 98-0382 V2
The Division of Water Resources (DWR) has performed a review of a 401 Water Quality Certification application dated
April 15, 2016 and received by DWR on April 22, 2016 for the above referenced project. The DWR has determined that
your application is incomplete and cannot be processed. The application is on -hold until the following information is
received:
1. Per Water Quality General Certification No. 3890, this project is required to provide a stormwater management
plan (SMP) to protect water quality (regardless of project area or amount of impervious area). Please see
Appendix A of the General Certification, available here, and submit a plan that is in accordance with low density
project stormwater requirements. Alternatively, you may provide a copy of the locally reviewed SMP with proof
of approval if the jurisdiction is certified for 401 stormwater management plan reviews.
Pursuant to Title 15A NCAC 02H .0502, the applicant shall furnish all of the above requested information for the proper
consideration of the application. If all of the requested information is not received within 30 calendar days of receipt of
this email, the DWR will be unable to approve the application and it will be returned. The return of this project will
necessitate reapplication to the DWR for approval, including a complete application package and the appropriate fee.
Feel free to submit the above requested information to me via email.
Contact me if you have any questions or concerns.
Regards,

Zan Price, P.E.
Assistant Regional Supervisor — Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
828 296 4662 office
828 231 9634 mobile
zan.price(cDncdenr.gov
2090 U.S. Hwy. 70
Swannanoa, N.C. 28711
��NothingCornnpares.]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.