20170481 Ver 1_More Info Received - Email_20170524

Goss, Stephanie
From: Wazenegger,Amy J. <[e-mail]>
Sent: Wednesday, May 24, 2017 3:42 PM
To: Goss, Stephanie
Cc: Hyatt, Dale; Becker,Jonathan W.; Karagosian,Adam H.
Subject FW:2016-01123 Oakland Hills Way- Additional information requested
Attachments: 2017-05-24_PCN —Oakland Hills - Updated Cross Vane (Sheet 7 of 8).pdf; 2017-05-24
_PCN -Oakland Hills - Updated Impact Exhibits (Sheets 1-7).pdf
Importance: High
Dear Ms.Goss,
I understand you are the reviewer for one of our projects(#20170481—Oakland Hills Way Stream Stabilization). We are
designing the improvements for the City of Raleigh and Blair Hinkle.
We have received a few minor comments from Tasha Alexander with the USACE (see bottom of this email chain) and
would like to pass along a copy of our response to her comments(see below) and the updated sheets(attached)for
your records. The updates do not affect the area of impacts reported in the original PCN. The updates are as follows:
• Slope of cross vane arm has been adjusted from 4-20%to 12-18% (limiting the design range a bit)
• Legend of the impact exhibits has been corrected so that the hatching/pattern is consistent with the impact
drawings(again;the impact areas have not changed)
Let us know if you need anything else on your end,
Thank you,
Amy
Amy J.Wazenegger, PE, CFM
Supervising Water Resources Engineer
Phone:[phone]
Mobile:[phone]
Email:a mv.wazenequer(cilwsp.com
Please note I have a new email address.
WSP USA
434 Fayetteville Street
Suite 1500
Raleigh, NC 27601
wsp.com
WSP I Parsons Brinckerhoff is now WSP.
1

From: Wazenegger,Amy J.
Sent:Wednesday, May 24, 2017 3:36 PM
To: 'Alexander,Tasha L CIV USARMY CESAW (US)'<[e-mail]>
Cc: Hyatt, Dale<[e-mail]>; Becker,Jonathan W.<[e-mail]>; Karagosian,Adam H.
<[e-mail]>
Subject: RE: 2016-01123 Oakland Hills Way-Additional information requested
Importance:High
Tasha,
Thank you for your comments on Oakland Hills Way(#2016-01123). Please see our responses below.
1. We have assembled this brief narrative below describing the minimal adverse environmental effect(for the waiver
request):
Within the project area, approximately 8,060 square feet of palustrine forest wetlands have been delineated. Of
this existing wetland area, only 2,030 square feet(approximately 25 percent) will be impacted by
construction. Only 200 square feet will be permanent impacts, comprising only 2.5 percent of the delineated
wetland area.All areas listed as temporary impacts will be revegetated with regional, hydrophytic vegetation in
order to promote regeneration of the wetland. Planted woody material will be at least 2 years of age to ensure
quick establishment and an eventual return to the pre-construction,forested site conditions. Tree protection
fence will prevent unnecessary tree removal/damage.
After completion of the proposed project and re-establishment of vegetation, temporarily impacted wetland
areas will continue to perform beneficial, ecological functions, including groundwater recharge,filtration and
storage of pollutants and suspended solids, carbon storage, nutrient cycling, wildlife habitat, and flood
attenuation. In addition, the stable stream channel will maintain floodplain connectivity and provide stable
conveyance of storm water.
In summary, the proposed wetland impacts will result in no more than minimal adverse environmental effects
based on: the minimal amount of permanent wetland impact; the reforestation of temporarily impacted wetland
areas, which will maintain the ecological function of the wetland;and the improved channel form/function
resulting from the proposed streambank stabilization.
2. Regarding the slope of the cross vane arm, we have further evaluated the constructability of the structure (based on
the channel size vs.the boulder sizes) and feel comfortable narrowing the slope range to 12-18%. The actual
constructed slope will depend on the available boulder material and field conditions during construction. We have
revised the relevant plan sheet and have attached it for your records.
3.Additionally, we noticed a minor error in the legend of the impact exhibits. We have attached a revised version of the
impact exhibits for your records. The revision does not affect the size of the impacts; we only adjusted the patterns in
the legend to be consistent/correct.
Please note, I plan to send this same information to Stephanie Goss at NCDENR via email for her records.
Please let me know if you need anything else,
Thank you,
Amy
Amy J.Wazenegger, PE,CFM
Supervising Water Resources Engineer
2

ns
Phone:[phone]
Mobile: [phone]
Email:amv.wazenegaerAwso.com
Please note I have a new email address.
WSP USA
434 Fayetteville Street
Suite 1500
Raleigh, NC 27601
wsp.com
WSP I Parsons Brinckerhoff Is now WSP.
Original Message
From:Alexander,Tasha L CIV USARMY CESAW(US) [mailto:Tasha.L.AlexanderPusace.army.mil]
Sent:Thursday, May 18,2017 3:13 PM
To:Wazenegger,AmyJ.<[e-mail]>
Subject: 2016-01123 Oakland Hills Way-Additional information requested
Amy,
As a follow-up to my voicemail I have a couple questions about the Oakland Hills Way stabilization project.
The project involves discharge of fill into a special aquatic site,wetlands,as part of the stabilization project. Per the
NWP 13,section (d) below,this activity requires a waiver. Please provide a brief narrative describing the minimal
adverse environmental effect to support a waiver request.
(d)The activity does not involve discharges of dredged or fill material into special aquatic sites, unless the district
engineer waives this criterion by making a written determination concluding that the discharge will result in no more
than minimal adverse environmental effects;
Additionally, I have a question about plans for the cross vane shown on Sheet 7. The slope for the vane arm is 4%to
20%. Is this range typical? I usually see smaller variations in ranges for these structures. Can you explain?
Thank you,
Tasha Alexander
Regulatory Specialist
Raleigh Regulatory Field Office
U.S.Army Corps of Engineers-Wilmington District
3331 Heritage Trade Drive,Suite 105
Wake Forest, North Carolina 27587
Phone:[phone], extension 35
email:[e-mail] The Wilmington District is committed to providing the highest level of support
to the public. To help us ensure we continue to do so, please complete the Customer Satisfaction Survey located at our
website at http://www.saw.usace.army.mil/missions/RegulatoryPermitProgram.aspx to complete the survey online.
3

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•
4

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