20110529 Ver 1_More Info Received_20110809

I1 - D.S a 9
Town of Lake Lure
P. O. Box 255 • Lake Lure, NC 28746-0255 • 828/625-9983 • FAX [phone]
Incorporated 1927
August 1, 2011
Ian McMillan
WBSCP Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Chuck Cranford
Surface Water Protection Section
2090 US Hwy 70
Swannanoa, NC 28778
To Whom It May Concern:
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This letter is in response to the Request for More Information regarding 401 Water
Quality Certification for the Lake Lure Morse Park Area, DWQ Project # 11-0529.
After speaking with Chuck Cranford regarding this project, we believe that we have come
up with a more workable and acceptable design solution for the Morse Park area. This
should address the concerns expressed. An amended narrative has been attached which
should more adequately describe how we intend to address the issue.
If there is anything further that needs to be done, please let us know. If you have any
questions please contact me at [phone] ext. 502.
Sincerely,
Clint Calhoun
Environmental Management Officer
Enclosures
Town of Lake Lure
Morse Park Rip Rap Project
Project Description: Site is located at 2948 Memorial Highway on Town of Lake Lure
property known as Morse Park. Morse Park is a Town recreational area that provides
greenspace and Town facilities for hosting festivals, weddings, and other events. There
are over 6 acres of riverine wetland that make up the Morse Park area. Trails meander
through the park and along the lake shore. The shoreline is sparsely vegetated which
results in accelerated erosion of the shoreline due to wave action from boats and flood
waters during large storm events. The erosion is creating sediment problems for the lake
and also slowly removing land area that the Town uses.
The Town of Lake Lure would like to stabilize 370 feet of shoreline in this particular area
of Morse Park in order to reduce the level of erosion occurring at this site and protect the
shoreline from the impacts that result from wave action and high velocity flood waters
during big storm events. The Town, in exploring all options and alternatives, believes
that the stabilization should be done using a combination of methods which would consist
of rip rap in conjunction with riparian plantings using a mixture of woody and herbaceous
species. The rip rap will extend just below the water line vertically approximately 2 feet
and horizontally into the lake approximately 4 feet. Some sloping of the bank will be
necessary in order to provide a stable platform to place the rip rap. Turbidity curtains
will be used to control turbidity that will be generated as the work is being performed.
All impacts will be temporary in nature and will only last through the duration of the
project. This would also tie in with an area of shoreline that was armored many years ago
that has remained somewhat stable. Live stakes would be incorporated into the rip rap
installation as well as above the rip rap extent to provide sufficient woody mass to
prevent further erosion of the shoreline (Figure 1). A combination of native plants will
then be added shoreward to enhance the area. A no-mow policy will be instituted to
prevent damage to the plantings and lessen damage to the shoreline from equipment.
Figure 1.
Cross section
Not to scale
0' .
Stream-forming now o
Baseflow
?...:., Toe protection
Geotextile fabric
Live stakes will be a combination of silky dogwood (Cornus amomus), buttonbush
(Cephalanthus occidentalis), elderberry (Sambucus canadensis), and silky willow (Salix
sericea). Additional plantings will consist of species transplanted from on-site such as
cardinal flower (Lobelia cardinalis), sensitive fern (Onoclea sensibilis), new york
ironweed (Vernonia novaboracensis) and various native grasses and sedges.
The town would also like to place additional rip rap around the headwall of a pipe that
leads from a small retention pond into the lake (see site plan). Both the pipe inlet at the
headwall and the pipe outlet and surrounding shoreline require armoring due to some
scour that is occurring around the headwall and pipe outlet as lake levels fluctuate.
Approximately 8 linear feet of rip rap will be placed around the pipe inlet structure (4 feet
on each side of the pipe) with rip rap coming up from the edge of the water 2 vertical feet
and extending no more than 4 feet horizontally into the water. On the outlet side of the
2 to 3 feet
Erosion
control
fabric
' Dead stout
stake
?O
2 to 3 feet
..
. (triangular spacing}
Live cutting
1/2 to 1 1/2 inches in diameter
Note:
Rooted/leafed condition of the living
plant material is not representative of
the time of installation
pipe which flows into Lake Lure, approximately 21 linear feet of rip rap will be placed
around the pipe outlet and surrounding shoreline to reduce scour that is occurring due to
fluctuating lake levels and wave action from boats.
All work will be performed in accordance with a sediment and erosion control plan that
will be submitted to the Town of Lake Lure for review and approval prior to the start of
work and shall be in accordance with the General Permit under which this project is
authorized.
The Town Environmental Management Officer will oversee the project and report any
issues if they arise to the Asheville Regional Office.
Contact Information:
Dean Givens
Director of Lake Operations
Town of Lake Lure
P.O. Box 255
Lake Lure, NC 28746
Phone: [phone] ext. 501
Fax: [phone]
E-mail: loa &townoflakelure.com
Clint Calhoun, CFM
Environmental Management Officer
Town of Lake Lure
P.O. Box 255
Lake Lure, NC 28746
Phone: [phone] ext. 502
Fax: [phone]
E-mail: eco'a-townoflakelure.com