20140124 Ver 1_BMP1 visit - Level Spreader Revision_20161128

Strickland, Bev
From:Freeman, Hunter <[e-mail]>
Sent:Monday, November 28, 2016 6:29 PM
To:Robinson, Jason; Smith, Cherri L
Subject:RE: Greenway Village BMP1 visit
Attachments:2016-11-18_Greenway Village_BMP #1 Detail.pdf
Jason – I’ve attached a first version of our plan to retrofit the existing low area into a small constructed wetland.

There was a survey bust during the design stage and during construction it was discovered that the existing conditions at
the site of BMP1 consisted of an unmaintained grassy area in a shallow depression. The bypass pipe for BMP has been
installed, routing roof runoff to the area, which now holds water from 0” to 9” deep for extended periods of time. Water
level gradually recedes due to infiltration and evaporation.

A revised survey of the area validated a potential redesign option which would relocate the level spreader lip to an area
+/- 200’ north of the existing location. The redesigned location would require additional piping and would have located
the vegetated filter strip in a remote area, increasing the maintenance burden and decreasing the likelihood of
consistent long term performance. After internal discussion and a site meeting with Mr. Richardson, we decided to
pursue a permit revision to replace the proposed level spreader with a modified design for a constructed wetland.

The existing low are encompasses approximately 950 sf and would require little or no additional grading. We propose to
vegetate the area with 99 herbaceous plants in the area most prone to long term inundation, and 96 herbaceous plants
and 4 shrubs on the perimeter of the inundation area. A narrow channel area will be incorporated into the planting plan
in the event of high flows. The outlet from the area is a natural earthen berm which currently exists within the riparian
buffer. The additional plant material will further aid in dewatering the system compared to the existing condition.

No additional buffer disturbance is proposed at this time, however the condition of the buffer will be inspected annually
to monitor erosion, rills and gullies which may form over time.

We appreciate your consideration of this natural alternative.

Hunter

From: Robinson, Jason \[mailto:[e-mail]\]
Sent: Wednesday, November 16, 2016 4:16 PM
To: Freeman, Hunter <[e-mail]>; Smith, Cherri L <[e-mail]>
Subject: RE: Greenway Village BMP1 visit

Hi Hunter,

Yes, I’ve spoken with Cherri about this. Please provide a detailed email explaining why the existing plan isn’t feasible,
the proposed solution, and a marked-up drawing showing the revisions. After reviewing, if we’re ok with it, we’ll email
back with approval for the revisions.

Let me know if you have any questions.

-Jason
_ _ _ _ _ _ _ _ _ _ _ _,
1

Jason T. Robinson, P.E.
Raleigh Regional Office
Water Quality Regional Operations
Division of Water Resources, DEQ
919-791-4200

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.

From: Freeman, Hunter \[mailto:[e-mail]\]
Sent: Wednesday, November 16, 2016 2:06 PM
To: Robinson, Jason <[e-mail]>; Smith, Cherri L <[e-mail]>
Subject: RE: Greenway Village BMP1 visit

Jason – have you had a chance to discuss this with others in your group? Just let me know what information you need to
keep this moving forward.

Thanks

Hunter

From: Robinson, Jason \[mailto:[e-mail]\]
Sent: Monday, November 14, 2016 3:35 PM
To: Freeman, Hunter <[e-mail]>; Smith, Cherri L <[e-mail]>
Subject: RE: Greenway Village BMP1 visit

Thanks Hunter, see you tomorrow.

_ _ _ _ _ _ _ _ _ _ _ _
Jason T. Robinson, P.E.
Raleigh Regional Office
Water Quality Regional Operations
Division of Water Resources, DEQ
919-791-4200

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.

From: Freeman, Hunter \[mailto:[e-mail]\]
Sent: Monday, November 14, 2016 9:21 AM
To: Smith, Cherri L <[e-mail]>; Robinson, Jason <[e-mail]>
Subject: Greenway Villlage BMP1 visit

Jason – here’s a link to google maps showing where I’d like to meet tomorrow.

https://www.google.com/maps/place/35%C2%B048'45.4%22N+78%C2%B041'28.6%22W/@35.812622,-
78.6922009,396m/data=!3m2!1e3!4b1!4m5!3m4!1s0x0:0x0!8m2!3d35.812622!4d-78.69128

It’s very close to the intersection of Horton Street and Palm Court.

I also attached a scan of the BMP construction drawing showing where I’d like to discuss adding wetland plantings in lieu
of the LS/VFS.
2

My cell phone is 919-264-7613 if you need it. See you at 9:30

Thanks

Hunter

Hunter Freeman, PE, LEED AP

115 MacKenan Drive Cary, NC 27511
  |  
131½ S Wilmington Street Raleigh, NC 27601
  |  
Office: 919.469.3340 Direct: 919.535.5137
  |  
Mobile: [phone]
[e-mail]

CONFIDENTIALITY AND NONDISCLOSURE

3