20050666 Ver 1_More Info Received_20051206

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Wetland and Natural Resource
Consultants, Inc.
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November 21, 2005
Division of Water Quality rr~ "--- - -
Attn: Mr. Alan Johnson A"` " ` ~%CURCE8
610 East Center Ave., Suite 301 ~~~'°°` ~~~~ pF~~
Mooresville, NC 28115 ~ ~'~
Re: The Bridges at Mint Hill (DWQ Project #05-0666) NOV 2 ~ 200'
Mecklenburg County, North Carolina
Mr. Johnson:
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The purpose of this letter is to provide you with the additional information reque~'t~~f~
the Division of Water Quality letter dated June 14, 2005 in regards to 401 Water Quality
Certification for The Bridges at Mint Hill (Bridges). This letter is intended to provide you
information relating to the project's mitigation, secondary and cumulative impacts,
stormwater management plan, and pond draining activities.
Construction Details
Detailed diagrams for the road crossing and sewer crossing are attached to our
correspondence to the US Army Corps of Engineers dated September 7, 2005. The letter
explains a reduction in impacts that was achieved by spanning two of the crossings and
boring the sewerline under Goose Creek.
Mitigation Plan
While we agree with the Division's position that enhancement and stabilization may be
more cost effective, the proponent maintains their proposal to restore 800 linear feet of
streams, as this amount exceeds the State's policy for 1:1 stream restoration. While this
is the same length of restoration previously proposed in the permit, the total impacts of
the project have decreased from 654 linear feet to 579 linear feet by utilizing spanning
structures (See above.). The anticipated Corps special conditions are expected to help
toward achieving the Division's intent to stabilize the channel by removing the cattle. The
conditions are expected to require that the boundaries of the preservation areas be field
located and that the surveyed boundaries be marked with temporary fencing (e.g., orange
webbed tree-protection fencing) prior to any land disturbance activities on the site.
Markings on the boundary fencing will identify the demarcated area as a protected area,
Newton Office Canton Office
PO Box 224 ~ ~~~
wnri PO Box 882
Newton, NC 28658 D Canton, NC 28716
828-465-3035 ~ ~ (; ~ X005 88

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and the fencing will remain in place throughout the duration of all construction activities
associated with the project. It will be required to contact a representative of The U.S.
Army Corps of Engineers Regulatory Division at least two weeks prior to removal of the
fencing to ensure compliance. We have asked that the Corps make provisions within their
special conditions that would allow a third party to conduct stream restoration along Goose
Creek within the project area as we are exploring this option.
Vegetated Buffers
Attached is a diagram of the buffers that will be maintained at the Bridges site. The
diagram is explained in the letter to the Corps dated September 7, 2005.
Cumulative Impacts
Potential cumulative impacts arising from the Bridges have been carefully considered and
mitigated to the extent possible by the developer. The proponent's proactive utility
strategy does not induce potential growth through the construction of water and sewer
infrastructure, because the water for the Bridges will come from existing waterlines and
waste water will be pumped from the site via a private pump station and forcemain. The
sewer pump station will have no additional capacity that could serve as a catalyst for
higher density growth within the drainage basin. Potable water for the project will be
derived from the Catawba Basin and returned to the basin via the private sewer system.
Below is a current image from the Mecklenburg County 6I5 that depicts the project site
along with the existing zoning for the project vicinity. The project is located west of I-
485 and is colored with blue and tan and outlined in orange. The CUD designation is a
Conditional Use District that grants Mint Hill's Town Council with the right to place
conditions on the zoning request. The approved zoning conditions were presented with the
permit application.
The majority of the surrounding land area is zoned for single family residential
development with all tracts exceeding 10 acres within the vicinity of the project being
zoned as such. All additional development within the project area will need to be
supported by septic tanks or other private wastewater facilities, and drinking water will be
derived from either existing waterlines or private wells. Note that three subdivisions are
shown in red in the figure; these projects are being developed or are expected to be
developed in the near term intimating that some development will occur in the project
vicinity absent the construction of the Bridges.
One tract within the project vicinity, but not part of the project, is zoned for general
business, and it too is within the Conditional Use District. The project applicant has no
control over the development of this parcel. It is expected that this property will need to
comply with all Mecklenburg County regulations including SWIM buffers and NPDES
Newton Office Canton Office
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requirements in the same manner as the Bridges of Mint Hill project will comply with cited
regulations. It should be noted that the Bridges exceeds the aforementioned regulations
and that it is the standard by which future projects will be judged.
Another tract within the project vicinity, but not part of the project, is zoned
Institutional (I) and is expected to be subject to all environmental requirements of the
business classification.
Zoning Key: (Source: Mecklenburg County GIS)
R -Residential District -This district is designed to encourage the protection of
the natural and manmade environment and resources and the retention of existing
farm lands, rural estates, forested and water areas and other open type uses as
well as the diversification in modes of living and housing types by encouraging
building lots of varying size and dwelling unit densities consistent with the stated
goals and objectives for promoting and protecting the unique rural and country
village character of the community set forth in the adopted land use plan. Other
Newton Office Canton Office
PO Box 224 wnrinc.com PO BOX 882
Newton, NC 28658 Canton, NC 28716
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828-465-3050 Fax [phone] Fax
Zoning Figure (Source: Mecklenburg County GIS)

selected uses, consistent with the needs of the community, are also provided for in
this district. (Mint Hill Zoning Regulations)
B-G(CUD) -General Business(Conditional Use District) -This district is identical to
B-G except that Mint Hill's Town Council has the right to place conditions on the
zoning request. (Mint Hill Zoning Regulations)
I -Institutional -This district is intended to accommodate mid and large sized
public, semipublic, and institutional uses which have a substantial land use impact or
traffic generation potential. It is not intended for the small institutional uses
customarily found within residential areas. Because of potential adverse impacts, all
institutional uses shall require site plan approval by the Board of Commissioners.
(Mint Hill Zoning Regulations)
While the project may, by some, be considered a catalyst for growth, any potential future
growth within the basin will progress according to the strict zoning requirements of the
Town of Mint Hill and Mecklenburg County. The largest catalysts for growth in the area
are I-485 which passes adjacent to the project area and the existing waterlines that
enter the Goose Creek Basin. Environmental Assessments for the aforementioned state-
funded projects contemplated growth within the Goose Creek Basin and mitigated
potential impacts by encouraging zoning and growth limitations that are still in place.
Namely, according to the approved Inter Basin Transfer certificate no new waterlines will
be extended into the Goose Creek basin to serve the project, and zoning approval requires
significant stormwater controls.
Furthermore, both the Town of Mint Hill and Mecklenburg County have strict water quality
regulations that will protect existing water quality in the event of further growth and
could in fact, when fully implemented, help towards removing Goose Creek from the states
303d list. Namely, the County requires streamside buffers in accordance with the SWIM
program, and the Town requires stringent stormwater controls and encourages low impact
development. The existence of these regulations should eliminate the need for additional
regulatory measures.
Vegetated buffers to streams within the Bridges will surpass local stream regulations
associated with the SWIM program and will exceed by three-fold any regulations that are
required by the state for similarly classified waters. The attached diagram illustrates the
expanse of area that will be buffered and shows that the average buffer to Goose Creek
is 197 linear feet with all instances being greater than 50 linear feet. It is expected that
all additional commercial and business development in the project vicinity will be held to
Newton Office Canton Office
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Newton, NC 28658 Canton, NC 28716
828-465-3035 828-648-8801
828-465-3050 Fax [phone] Fax

this same high standard. The project proponent desires to set the high standard in
environmental preservation and management for all comparable future development.
State of the art stormwater management practices will be the standard for the site;
supporting information is attached. The project engineer has demonstrated that by
adhering to low impact development (LID) concepts and the draft Mint Hill Water Quality
Ordinance, the Bridges will meet or exceed all required performance criteria designed to
minimize any changes to the pre-development runoff hydrograph. These facilities will also
achieve or exceed the 85% TSS treatment requirements imposed by the state. Again, the
project proponent desires to set the high standard for all additional like development
within the basin.
The combination of existing SWIM Buffers, NPDES regulations, and the Draft Mint Hill
Water Quality Ordinance will keep the Bridges and any other foreseeable development
from degrading Goose Creek further. While Goose Creek was identified on the 303d list
in 1998 for a standard violation of increased levels of fecal coliform resulting from either
construction or urban runoff/storm sewers any future growth should not contribute to
this problem when existing regulations are fully honored. Fecal coliform levels resulting
from the Bridges are expected to be extremely low and not significant, because
stormwater facilities (including stormwater wetlands which are ideal for the removal of
urban pollutants (BMP Manual)) are proposed above and beyond all criteria for such in the
area. Therefore, the Bridges will not contribute to the fecal coliform contamination of
Goose Creek on account of the stringent stormwater controls that will be implemented.
Pond Draining
The following text will be amended to the Erosion Control Plan for the Bridges and will be
submitted to Mecklenburg County for review and approval under their erosion control
regulations. The approved erosion control plan will be submitted for your records.
1: Excavate a stilling basin outside of jurisdictional wetlands (Dimensions and location to be
determined by engineer and approved by regulating authority.) and line with rip-rap (Class
to be determined by engineer.).
2: Construct arip-rap apron from the stilling basin back to the projected breach point.
3: Construct a siphon using PVC pipe (Pipe size and volume to be determined by engineer.)
and that extends from the pond to the stilling basin and lower the pond surface elevation
at a rate of approximately 1 foot per day but not to exceed 2 feet per day.
4: Daily excavate the breach (Dimensions of trapezoidal breech to be determined by
engineer.) to the water surface elevation at the end of the day and extend rip-rap to the
edge of water.
Newton Office Canton Office
PO Box 224 wnrinc.com PO BOX 882
Newton, NC 28658 Canton, NC 28716
828-465-3035 828-648-8801
828-465-3050 Fax [phone] Fax

5: Daily seed and mulch (1 ton /acre) exposed pond bed with 50% winter rye and 50%
fescue by acre and over seed with Juncuss effusesat a rate of 8 oz. per acre.
The above provides the framework by which the pond will be breached. The above
measures will ensure that water quality is maintained but the approval of the breach will
need to be approved by Mecklenburg County.
Feel free to call me at 828 / 320-8120 with any questions that you may have.
Best regards,
~~
hris Huysman
Newton Office Canton Office
PO Box 224 wnrinc.com PO BOX 882
Newton, NC 28658 Canton, NC 28716
828-465-3035 828-648-8801
828-465-3050 Fax [phone] Fax

Wetland and Natural Resource
Consultants, Inc.
September 7, 2005
Ms. Amanda Jones
US Army Corps of Engineers
151 Patton Avenue, Room 208
Asheville, NC 28801
RE: The Bridges at Mint Hill
Mint Hill, Mecklenburg County, NC
Ms. Jones:
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The purpose of this letter is to provide you with the additional information you requested for the
processing of the Nationwide Permit for The Bridges of Mint Hill. This letter is intended to provide you
with information relating to project's stormwater management, stream buffer widths, internal. road
crossings, and utility infrastructure. It is our belief that this information is sufficient to address your
regulatory concerns relating to Section 404 impacts attributed to the project. Also included is
information concerning Lawyers Raad and off-site sewer infrastructure that was requested by the US Fish
and Wildlife Service and the NC Wildlife Resources Commission.
This package contains calculations from the project engineer that demonstrate that implementation of the
stormwater controls mandated The Mint Hill Water Quality Ordinance results in apre-development and
post-development hydrograph that are highly similar (Attachment l: Hydrologic/Hydrographical Study).
The memo discusses the methods utilized to assess control and treatment, and graphs show that the
hydrograph for run-off generated within asub-basin of the proposed development are highly similar. This
data shows that pre-development and post-development hydrographs are suitabiy similar to minimize
potential downstream impacts from peak-flow discharges when the treatment mandates of the ordinance
are met.
Attached is a figure that highlights the vegetated stream buffers within the development (Attachment 2:
Vegetated Buffers). The buffers along Goose Creek average 192.5 liner feet using simple math that
relates total vegetated areas along streams (28 acres) to the length of Goose Creek (3, ] 60 linear feet). The
minimum width of the vegetated zone is 298 and the maximum width. of the zone is 435 feet. Native trees
and shrubs will be used for landscaping within 200 feet of Goose Creek.
We have evaluated soil and hydrologic conditions at each of the two road crossings where we proposed
pipe in our April permit application. Based on these findings we are going to utilize spanning structures
that will. provide a clear span of the regulated streams. The redesign demonstrates the proponent's
willingness to minimize and avoid impacts to streams. These additional studies have shown that we can
not effectively bridge the stream crossing between the upper reaches of the pond and Interstate 485. We
therefore request that we be granted authorization to pipe this crossing. Piping the single crossing
minimizes impacts by 751ineaz feet in comparison to the April permit application. We have attached a
Newton Office Canton Office
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Newton, NC 28658 Canton, NC 28716
828-465-3035 828-648-8801
828-465-3050 Fax [phone] Fax

schematic of the crossing which includes plan and profile view and are committed to adhere to
Wilmington Regional Conditions (Attachment 3. Construction Schematics).
Based on geotechnical studies the sewer line can be bored underneath Goose Creek and will not require
any discharge. We retract the request for this impact in the attached revised Pre-Construction Notification
(Attachment 4: Revised Application).
Attached is a copy of the routing for the private forcemain sewer that will be installed to serve the project
(Appendix l: Sewer and Water Infrastructure). This utility will be constructed within road rights of ways
and will not require any impact to Waters of the US. Stream crossings will be bored or placed inroad
shoulders. Also shown in this figure is the municipal water and sewer infrastructure in the project vicinity
and date the utility was operable.
The final appendix is a copy of the traffic study for Lawyers Road. that was commissioned by the project
proponent. Based on these findings the developer will be responsible for the construction of additional
travel lanes. None of the construction will result in a discharge of fill into Waters of the US.
Please feel free to call. me at 828 / 320-8120 with any questions that you may have.
Best regards,
Chris Huysman
Newton Office Clyde Office
PO Box 224 wnrinc.com 217 Paragon Parkway, # 142
Newton, NC 28658 Clyde, NC 28721
828-465-3035 828-627-0051
828-465-3050 Fax [phone] Fax

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MEMO
t7ATE: August 10, 2005
PROJECT NAME: The Bridges at Mint Hill
TO: Chris Huysman
Wetland and Natural Resources Cansuftant, Inc.
FROM: Kevin W. Vogel, PE
RE: Bridges at Mint Hill
Wydrologic/Hydrograptrical Study
PROJECT #: 1002024
As requested t.andDesgn has performed a preliminary hydrologicJhydrographical study of a portion of the proposed f3ririges at Mint Hilt
project. This analysis was performed in order to represent the change trertween the pre-developed runoff hydrvgraph vs. the post'
developed runoff hydrograph. Attached please find the resultant hydra€}r8phs generated from this study.
For the purpose of this study the 1-inch design store, 2-year and 10-year ders~n storms were analyzed and ~aphed. Law tngaact
Developed (Litz) ~ addition to canventiorur! storm water Best Management Practices were utlfized es t#ascrtbsd in the draft Mlint Hill
Water Quality Ordinance. Adherimg to the requirements of this ordinance allowed us to meet a exceed aH requited pew gitetta
designed to minimize any changes to the pre-developed nnwfF hydrograt~tt•
The performance criterion that atE land development activities are required to meet areas follows:
AB treatment systems shall be designed to achieve average annual 85% Total Suspended Solids (TSS) removal fur nmaff
generated from the first inch of rainfall.
Incorporate L!D practices to control and treat runoff from the first inch of rainfall.
• Control and treat the increase in storm water runoff volume assoaated with past-canstructk~n conditions as compared with
existing (pea-cansUuctian) condttions fQr the 2-year storm.
• Gontroi peak storm water runoff rates far the 2-Year and 10•year storms.
Divan Information:
The foAawir-g information was utilized to evaluate the site based on drainage boundaries, existing conditions, propc>:sed slte
layout. soil ~nditians, rainfaN duration, etc.
• Pre-cortstructian Dralnage area = 10.3 Acres
o Land Use =Woods in Fair Condition (GN = 60)
Time of Concentration = 7.3 minutes
Past-car~truction t?rairtage Area = 11.8 Acres
o Land Use ~ Commercial (85°!. imperviaus}(CN = 92)
Predominant Saii Type =Cecil
o Hydrologic group = B
Type il, 24-hour rainfall d~tribution
cx 2-year storm depth = 3.12 inches
n 10-year storm depth = A,13 inches
Assumed data:
The fdlowing is data lhat was assumed in order to provide the hydrologic study.
• Biorelentian average infittraticm rate = 1.5 inches/Fxwr
Post-construction Time of Concentration = 5 minutes
The studied, representative drainage area would yield similar results for alt drainage areas and discharges to the
creek within the site.
Methodology:
The first step in performing the study was to determine a drainage area within the project that is a repree3entative of the project
as a whole in regards to site layout, impervious area, pervious area, etc.. Once this is dome, it is necessary !d detennlere the
types of best management practices (BMP) that would best work within the site to accompNsh the r~equirad perfarmaske
criteria. For this study, it was determined that the combination of nine (4) t~ioretention areas and one (1) extetxlr~d detention
wetiand would serve the purpose of the Mint HiN Water Quality Ordinance, The drainage area was then subdivided ti,to smailer
PCi Br... 16444 [harpce:r. NC 2826-4454 22l North Graekam Sersrt CharWtte. NC 25ZQ'A Y: 7Wr.131.Q32S is 7g4.Irl.1f13S

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drainage areas which eantribute la either a bioretention area orwettand area... Each BMP was then sized Ong to the
contritx-ting drainage area using the NCDENR Starmwatsr Best Management Practices Manual The wetland w0s ate
designed to detain the additional volume of the 2-year storm and discharge it over a four day perked. After alt the 8MP's have
been preliminary designed, the information was entered into Haestad's Pand Pack 9.0 in order to model the system and create
the appropriate hydrographs.
Rosufis:
The attached hydn3graphs show that the combined use of bioretentian and extended detention wetlands either meet or exceed
the ns4uired perfomu)nce criteria and effectively minimize any change to the pre-developed runoff hydrograph.
ft should tee noted that the infomiatian used in this study is based on preliminary data and dtat actual results may vary from
what has been presented here.
PCe Box )6459 Charlotte, NC 26236-6441 223 Aforth Granam Street Charsatce, NL 28202 V; 741.)3).0325 f: 70~.376.t235

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