20161272 Ver 1_More Info Received_20170314 (2)

Strickland, Bev
From:
Jim Spangler <[e-mail]>
Sent:
Tuesday, March 14, 2017 4:41 PM
To:
Higgins, Karen; Alexander, Tasha L CIV USARMY CESAW (US)
Cc:
Ketchem, Brian ([e-mail])
Subject:
FW: Brickyard (DWR# 16-1272, Wake County); Corps AID
Attachments:
DRAFT ACOE_Impact Maps (02.06.17).pdf, Culvert Sequence Detail.pdf
Importance: High
Karen,
In response to your Request for Additional Information letter dated February 16, 2017:
1. You are correct that the Supplemental Sheet has a typo on it. The correct wetland impact is shown in Table C.2
of the PCN form.
2. Permanent Loss of Use of 251 Lf. is correct as shown in the Section 3.0 Stream Impact Table supplement, as
presented in the PCN documentation. For clarity, the impact locations are broken down as follows, using the
nomenclature [form # (plan table #)]:
a. Location [S1 (1A)]: 118 Lf. of which 36 feet shall be embedded rip rap energy dissipation as a scour hole
with NO PERMANENT LOSS OF USE [S1 (113 and 1C)] = 82 Lf. PERMANENT LOSS OF USE
b. Location [S2 (3A)]: 86 Lf., of which 21 feet shall be embedded rip rap energy dissipation as a scour hole
with NO PERMANENT LOSS OF USE [S2 (313)] = 65 Lf. PERMANENT LOSS OF USE
c. Location [S3 (4A)]: 140 Lf. of which 36 feet shall be embedded rip rap energy dissipation as a scour hole
with NO PERMANENT LOSS OF USE [S3 (413 and 4C)] = 104 Lf PERMANENT LOSS OF USE
3. No determination of the perennial/intermittent point has been made by DWR. Because our application
proposes to provide mitigation for Corps' permitting purposes of at least 1:1 for all 251 Lf. of impact to streams,
a determination of what of that 251 Lf. amount is intermittent has not been made. As you know, the Corps has
identified that 2:1 mitigation may be necessary for stream impacts unless data can be provided thatjustifies
only 1:1. We are in the process of determining relative condition of the streams in the various impact locations
for appropriate mitigation ratio purposes.
4. Condition #13 of GC3890: See below and the attachments.
5. Condition #6 of GC3890: See below and the attachments.
6. The Town of Cary is reviewing all aspects of this development including applicable Jordan Lake Riparian Buffer
Impacts.
Please feel free to contact me should you require additional information. Please let me know when we may expect to
receive the 401 Water Quality Certification for this project.
Regards,
Jim
SPANGLER
ENVIRONMENTAL, INC.
James A. (Jim) Spangler, CEI, A.M. ASCE

President
www.SpanglerEnvironmental.com
919-875-4288 0
919-875-4287 F
4338 Bland Road, Raleigh, NC 27609
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From: Hart, Brad [mai Ito: [e-mail]]
Sent: Tuesday, March 14, 2017 2:25 PM
To: Jim Spangler <[e-mail]>
Cc: Cal Rieder <[e-mail]>; Ketchem, Brian (Brian.Ketchem@ meritagehomes.com)
<Brian.Ketchem@ meritagehomes.com>; Beasley, Troy <[e-mail]>; Snoberger, Michael
<[e-mail]>; Beasley, Troy <[e-mail]>
Subject: RE: Brickyard
Jim,
Please see our suggested responses below. Also provided for reference is a copy of the impact maps and the culvert
installation sequence detail.
1. Note that twin culvert on Impact Map 1-2 (for Impact #1) illustrates one larger culvert alongside a smaller
"perched" culvert in order to mimic the natural channel. The base flow of the stream will be captured in the
larger culvert, which will maintain normal water depth and allow for aquatic life passage. The smaller "perched"
culvert will only receive flow during periods of extremely high flow/flooding. Also please refer to the attached
Culvert Sequence detail and outline that are also contained within the site construction drawings. Note that the
impact maps include provisions for embedded dissipaters for stabilization of the disturbed portion of stream
channel at both the downstream and upstream ends of the culvert. The rip -rap will be installed such that the
top of the rip -rap matches the pre -construction contours of the stream bed, which will maintain aquatic life
passage and allow the dissipator to continue functioning as a stream.
2. The sewer crossing at Stream Impact #8 will cross an intermittent stream in the very upper reach, just below the
stream origin. The flow in the upper reach of the intermittent stream is very brief and low in
volume. Construction of the sewer crossing will occur during predicted period of dry weather so that work can
be conducted and completed "in the dry'.
Thanks
Brad
Brad Hart, PE, LEED AP
WithersRavenet
PF ow ftopte. Your Swress.
115 MacKenan Drive I Cary, NC 27511
Office: 919.469.3340 I Direct: 919.535.5164
Mobile: [phone]
[e-mail]

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