20160294 Ver 3_More Info Received - Email_20170203

Strickland, Bev
From:Sara Stavinoha <[e-mail]>
Sent:Friday, February 03, 2017 9:50 AM
To:Mitchell, Robert K; [e-mail]
Cc:Price, Zan (George); [e-mail]
Subject:RE: Meadowmont Homes Expansion Phase 3 DWR#20160294
Attachments:170203_Phase3-Stream_Binder.pdf
Mr. Mitchell,

We appreciate your review of the subject project. Below is our response to your request for information.

1.Provide the proposed longitudinal profile and channel cross-section dimensions. Provide justification for the

proposed channel dimensions based on reference reach information or stable dimensions upstream and
downstream of the proposed re-alignment.
Longitudinal profile and channel cross-section dimensions have been provided in the attached plan set.

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Channel cross-section dimensions have been determined from the stable channels upstream and
downstream of the existing pond.
2.Explain how Condition number 7 of the GC 3885 “work in the dry” will be met (attached).

The inlet pipe in the earthen dam located at the pond inlet will be capped in order to restrict flow into

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the pond. Water will be pumped around the pond and conveyed to the existing channel downstream of
the pond. The pond will be dewatered with a pump and released at a rate consistent with the natural
flow of the stream. After an initial drying period of approximately 10 days (to be extended if any rain
events occur), the earthen dams (at the inlet and outlet of the pond) will be removed and construction
of the new channel will begin.
3.Clarify measures (erosion control/visual monitoring plan) to ensure that water quality standards

(turbidity/sediment loss) will not be exceeded during the removal of the existing earthen dam and pipe,
dewatering of the existing pond, and during construction of the realigned channel.
Visual monitoring will be performed daily to ensure water quality standards are being maintained. Photo

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documentation will be maintained throughout the project, including documentation of background
conditions prior to beginning work. It is our understanding that the turbidity in the receiving water shall
not exceed 50 NTU, and if turbidity exceeds this level due to natural background conditions, the existing
turbidity level shall not be increased.
Temporary, in-stream check dams will be used during pond dewatering, removal of the existing earthen

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dams, and construction of the new stream channel, to slow the flow of water and reduce
turbidity. Check dams will consist of coir logs and non-woven geotextile products. The discharge hose
from the pump around pump described above will be located upstream of one of the temporary check
dams. Permanent seeding and matting will be applied to disturbed and newly constructed stream banks
to reduce erosion.
4.Include construction details to stabilize the channel bed and provide grade control, if needed, to prevent

unstable headcuts in the proposed channel.
The longitudinal slope of the newly constructed channel will be approximately 2.4%. This very gentle

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slope will aid in maintaining a stable channel bed and will not promote headcutting in the proposed
channel. If field conditions show evidence of excessive unsuitable sediment deposition in the existing
pond and a stable channel bed cannot be maintained from compaction of existing soils, structures such
as log sills can be implemented to provide grade control and stabilize the channel bed.

Thanks again for your time. Please let us know if you have further questions or concerns.

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Sara Stavinoha

ANCHOR QEA OF NORTH CAROLINA, PLLC

(Formerly Altamont Environmental, Inc.)
[phone]

From: Mitchell, Robert K \[mailto:[e-mail]\]
Sent: Monday, January 23, 2017 2:16 PM
To: [e-mail]
Cc: Sara Stavinoha <[e-mail]>; Price, Zan (George) <[e-mail]>;
[e-mail]
Subject: FW: Meadowmont Homes Expansion Phase 3 DWR#20160294

Mr. Dale,

The Division of Water Resources (DWR) has performed a review of a 401 Water Quality Certification application dated
December 6 , 2016 and received by DWR on January 19, 2017 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.Provide the proposed longitudinal profile and channel cross-section dimensions. Provide justification for the

proposed channel dimensions based on reference reach information or stable dimensions upstream and
downstream of the proposed re-alignment.
2.Explain how Condition number 7 of the GC 3898 “work in the dry” will be met (attached).

3.Clarify measures (erosion control/visual monitoring plan) to ensure that water quality standards

(turbidity/sediment loss) will not be exceeded during the removal of the existing earthen dam and pipe,
dewatering of the existing pond, and during construction of the realigned channel.
4.Include construction details to stabilize the channel bed and provide grade control, if needed, to prevent

unstable headcuts in the proposed channel.

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 45 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.

You may provide your response to me via email or in writing at the address noted below. Contact me if you have any
questions or concerns.

Kevin Mitchell
Environmental Specialist – Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ – Division of Water Resources

828-296-4650 Office
Email [e-mail]

2090 U.S. Hwy. 70
Swannanoa, N.C. 28778

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Email correspondence to and from this address is subject to the

North Carolina Public Records Law and may be disclosed to third parties.

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