20180353 Ver 1_information-clarification_20180425

Johnson, Alan
From:Belflower, Jeff - NRCS, Spindale, NC <[e-mail]>
Sent:Wednesday, April 25, 2018 11:30 AM
To:Janiczak, Catherine M CIV USARMY CESAW (US)
Cc:Johnson, Alan
Subject:\[External\] RE: Miller revised PCN (UNCLASSIFIED)
Attachments:Miller_Plans_Rev4-25-18.pdf; StephenMiller_PCN_Revised4-25-18.pdf
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Hello Catherine,

Please see the attached revised plans and PCN for the Miller project.

The existing stream reach is 1450 feet long. The original plans proposed 1280 feet of channel. These revised plans
propose 1351 feet of channel. Therefore, the revised design proposes 99 feet of loss of channel. The proposed width of
the two stream crossings is 15 feet each, and 30 feet total. In total, the revised plans propose 129 feet of stream loss.
The PCN has been revised to reflect these changes.

If approved, the revised plans attached to this email will serve as the final plans for construction and will be used for
construction stakeout.

Please let me know if I can do anything else.

Thank you,
Jeff

-----Original Message-----
From: Janiczak, Catherine M CIV USARMY CESAW (US) \[mailto:[e-mail]\]
Sent: Tuesday, April 24, 2018 8:29 AM
To: Belflower, Jeff - NRCS, Spindale, NC <[e-mail]>
Subject: RE: Miller revised PCN (UNCLASSIFIED)

CLASSIFICATION: UNCLASSIFIED

Good morning,

I am looking over the stream impacts and I see that you are over 150 linear feet of total permanent stream loss. Any
stream loss that results in greater than 150 feet of require mitigation. Total permanent impacts will have to be reduced
in order to be under mitigation thresholds. Thank you.

Catherine M. Janiczak
Regulatory Specialist
U.S. Army Corps of Engineers
Charlotte Regulatory Satellite Office
Phone: [phone]

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-----Original Message-----
From: Belflower, Jeff - NRCS, Spindale, NC \[mailto:[e-mail]\]
Sent: Monday, April 16, 2018 11:31 AM
To: Janiczak, Catherine M CIV USARMY CESAW (US) <[e-mail]>; Johnson, Alan
<[e-mail]>
Cc: Glenn, Jabioas - NRCS, Statesville, NC <[e-mail]>; Propst, Jim - NRCS, Statesville, NC
<[e-mail]>
Subject: \[Non-DoD Source\] Miller revised PCN

Cathy and Alan,

A revised PCN is attached. I have included my responses to Cathy's remarks 1) and 4) below for clarity. You will see 20' of
ford-type crossing shown in the impact table. I reduced that number from the 30' we discussed during the site visit in
order to reduce the amount of permanent impacts. I will give Mr. Miller the option to either install two 10' wide
crossings at the locations shown in the design, or to install one wider crossing (15' to 18' wide) at one of the proposed
locations.

Section B, 3e:

This stream channel stabilization project will address instabilities along this approximately 1,270 foot long reach. The
channel has migrated laterally in multiple meander bends, likely due to straightening and channelization in the past, an
overly wide channel, and a high width/depth ratio. This process is continuing to erode vertical mass wasting banks on
the outside of almost every meander bend. Minor instabilities and an over widened channel exist throughout the reach.
The objective of this design is to address the stream's dimension, pattern, and profile to improve sediment transport
and stop bank erosion. Pattern or alignment will be corrected to a tolerable range and held in place with multiple
structures including log-vanes, cross-vanes, and j-hooks. These structures will also maintain a stable channel dimension
and profile created through construction activities. Improved aquatic and terrestrial habitat will be a by-product of the
channel stabilization. Native herbaceous and woody vegetation will be installed to provide long term stability.

Construction will involve the use of an excavator with a hydraulic thumb to place rocks and logs and to excavate new
benches and channel. Work will begin at the upper end of the reach, and will progress downstream. Construction will
only occur during base-flow or low flow conditions, and will progress in stages. Each stage will be seeded, mulched, and
matted before the next rain event. The excavator will work from top of bank; disturbance of the channel bed will be
minimal. A bulldozer will be used primarily to smooth disturbed areas above top of bank at the end of the project.

Section D, 1a:

Stream loss was minimized during the design process. The proposed stream length is mainly a function of designed
meander lengths and radius of curvature. The NRCS Area 1 engineering staff designs based on ratios derived from
reference reach data and successful projects. The designed radius of curvatures and meander lengths fall within our
acceptable range of ratios. The decrease in stream length is due to the prevalence of excessively sharp meanders
throughout the existing channel (radius of curvature is too small). Every effort was made to design a natural pattern with
appropriate sinuosity and meanders throughout the proposed reach.

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Thank you both for your help and guidance. Please let me know if I can do anything else to improve this application.

Jeff Belflower, PE

Civil Engineer

USDA-NRCS

500 West St

Spindale, NC 28160

828-287-4220, Ext. 110

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CLASSIFICATION: UNCLASSIFIED

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