20091099 Ver 1_More Info Received_20091030

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? ? ? Kimley-Horn
and Associates, Inc.
October 29, 2009
Mr. Steve Chapin
Asheville Regulatory Field Office
US Army Corps of Engineers
151 Patton Avenue, Room 208
Asheville, NC 28801-5006
Ms. Cyndi Karoly
North Carolina Division of Water Quality
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
Re: Additional Information for the 404/401 permit (Nationwide 39)
application (submitted 10/15/2009); NCDWQ Prj. No.09-1099
Bissell Development Site CBP-7
Charlotte, Mecklenburg County, NC
Dear Mr. Chapin/Ms. Karoly:
Kimley-Horn and Associates, Inc. (KHA) staff (Chad Evenhouse and Eric
Hampton) met with North Carolina Division of Water Quality (NCDWQ) staff
(Alan Johnson and Michael Burkhard) on October 22, 2009 at the project site to
review the site features and proposed project.
During the meeting, NCDWQ agreed with the site assessment information
submitted with the application package, and that the proposed impacts are the
least damaging practical alternative based on the site conditions and constraints.
During the field review, NCDWQ requested some design changes and additional
information for inclusion in the permit application. The required design
modifications include:
The relocated channel to be constructed must have a more natural
channel design. The typical cross section of the channel must include
bankfull benches and coir fiber matting rather than the trapezoidal, riprap
channel originally proposed. Also, a planting plan including native
species needs to be included.
At the downstream end of the project, below the outlet of the second
stormwater pond, the stream makes a 90-degree bend downstream of the
golf cart crossing bridge. This stream bank is nearly vertical, has
minimal vegetative cover, and currently experiences high near bank
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DENR - WATER QUALITY
WETLANDS AND STORMWATER BRANCH
¦
P.O. Box 33068
Raleigh, North Carolina
27636-3068
¦
TEL [phone]
FAX [phone]
? M ? Kimley-Horn
M and Associates, Inc.
stress during storm flows. NCDWQ recommended that bank
stabilization measures be applied to that bank downstream to the next
meander bend (approximately ten feet of bank). The stabilization would
consist of cutting into the bank at bankfull to establish a small bankfull
bench, apply eoir fiber matting on the lower bank and bankfull bench,
and protect the sloped upper bank with riprap.
Attached are amended figures and typical details addressing NCDWQ's
comments and amending the design per the on-site discussion.
Figure 5-A has been modified to show cross section locations.
Cross section A-A shows a downstream view of the bank stabilization area
downstream from the second stormwater pond. Note that the design calls for
there to not be disturbance to the stream channel itself, only modification to the
left bank. The bank full bench is to be planted with River Birch seedlings on
three-foot centers to replace the existing tree to be removed by laying back the
bank.
Cross section B-B shows a downstream view of the relocated channel cross
section adjacent to the first stormwater pond. This cross section shows that a
bankfull bench will be established along both banks with the exception of the left
bank in locations where larger hardwood trees (i.e. greater than four inches DBH)
may be preserved. These areas will be determined in the field by the Engineer.
The right bank will have a continuous bankfull bench through the length of the
channel relocation. The planting plan for this segment will be coordinated
through the golf course for aesthetic purposes, but will include native riparian
tree and/or shrub species. All stream bank areas and bankfull benches will be
seeded with a permanent riparian seed mix included in the cross section notes.
In addition to the comments provided during the field review, NCDWQ
subsequently provided the following comments regarding the stormwater review:
This project proposes to relocate an intermittent stream (rerouted through a swale)
in order to construct a stormwater pond B. Another pond A is proposed in the stream
such that the stream is routed through an RCP installed in the pond. 1 allowed by
the Corps and DWQ with or without mitigation (please veri this) the following are
illy comments:
1. The review of the Stornnwater Management Plan (SMP) would be conducted by
the City of Charlotte Staff to satisfy their Phase It Post-Construction Ordinance,
and therefore the 401 Certification may be issued subject to a SMP condition.
? M ? Kimley-Horn
M and Associates, Inc.
In response to the first paragraph, please note that the second stormwater pond is
located in an area considered to be a non jurisdictional vegetated swale (although
it does provide a hydrologic connection to upstream areas). The end points for
jurisdiction were GPS-surveyed and are shown in Figures 4 and 5-13 submitted
with the original application package. Also, site photographs of this area were
included in the application package (Photos 5 and 6). Regarding mitigation, the
254 linear feet of impact will be mitigated through the relocation of the stream
channel incorporating bankfull benches and riparian plantings. This is proposed
to be sufficient since the stream is "intermittent unimportant" lacking sufficient
flow to be biologically supporting.
Please feel free to contact me at 919-677-2121 if you have any questions, or if
additional information is necessary.
Very truly yours,
KIMLEY-HORN AND ASSOCIATES, INC.
Chad Evenhouse, PWS
Attachments
Cc: Clifton Coble, Bissell Development
Eric Hampton, Kimley-Horn and Associates, Inc.
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