19970412 Ver 1_Mitigation Project Review_20000710

State of North Carolina
Department of Environment
and Natural Resources •
Division of Water Quality
James B. Hunt, Jr., Govemor NC ENR
Bill Holman, Secretary NORTH CAROLINA DEPARTMENT OF
Kerr T. D , Fes- ENVIRONMENT AND NATURAL RESOURCES
10A1v
WATER ppUALITY SECTION
ASHEVILLE REGIONAL OFFICE x R E C E i k/L
Mr. Mickey Henson N.C. Dept. of EHNA
Appalachian Environmental Services J U L 2 6 2000
P.O. Box 52
Webster, North Carolina 28788 Winston-Salef,l
R(,qi anal Offic§
Re: iinnhaven II, Stream Restoration
D 12
Dear Mickey,
Thanks for the Restoration Plan for the Lynnhaven R project in Watauga County. The
approach to this plan is valid; however, it is not supported with necessary information.
Please reference Appendix B of the Draft Technical Guide for Stream Work in North
Carolina for specific details. This document can be accessed through our web site
(http://h2o.enr.state.nc.us/ncwetiands/). Specifically we would request that you provide
the precise location of the reference reach and that the cross section,pattern and profile data
for this reach is indicated. Pebble count data and analysis also should be provided. In
addition to this information we also request that you provide the following:
♦ Please submit data and calculations to show that sediment transport should be a
dynamic equilibrium. This should include sediment transport and shear stress
analysis. The "read outs" of any models such as HEC RAS that are used in such
analyses should be provided.
♦ Please provide general design details and specifications for any grade control or
bank stabilization structures that shall be used.
♦ Please provide preliminary site and cross section plans showing the required 25-foot
buffers and planting plan. The plans should show the existing and proposed channel
and features. These plans should be provided on full size sheets and should indicate
proposed locations of structures, grading, etc. to be performed during construction.
i Please provide a co%struc;tioa sequence and estiui-mi.ed tinic line of the construction.
♦ Also provide some kind of permanent protection for the restored stream and buffers.
Wetlands/401 Unit 1621 Mail Service Center Raleigh,North Carolina 27699-1621
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♦ Please provide a more detailed monitoring plan for this project. The plan as
presented is inadequate. Please refer to the Technical Guide for Stream Work in
North Carolina and the Benthic Macroinvertebrate Guidance documents for
additional information.
Please be reminded that the 401 certification states that no stream impact shall occur until
written DWQ approval is received for a detailed stream restoration.
Sincerely,
qhn Dorney
Cc: Dave Penrose,Wetland Unit
Jeff Jurek, Wetlands Restoration Program
Asheville District Corps of Engineers
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