20070816 Ver 2_More Info Received_20090701

LMG
LAND MANAGEMENT GROUP INC.
Environmental Consultants
TO: Mr. Chad Coburn
NC Division of Water Quality
127 Cardinal Drive Extension
Wilmington, NC 28405
June 29, 2009
01- O$? Lo va.
V l?? 2;inJ
dYS?(ti`OSANDWTn???QUG,LI
c. i
RE: 401 Water Quality Certification/NWP 29 Application; Additional Information
Eagle Creek Subdivision; Brunswick County, NC
DWQ Project # 07-0816 Ver 2
Dear Chad:
As we recently discussed, we had inadvertently omitted a small isolated wetland impact
on the previous application submittal for Eagle Creek Subdivision. Attached are the revised maps
that show this additional impact (I3; 0.0003 ac). Additionally, we have submitted a revised
restoration plan and map (El 1). Slight revisions were made to the plan based on comments
received by Kim Garvey of the Corps. We clarified planting areas and numbers and also
corrected erroneous information about stormwater requirements.
Please let me know if you need any additional information. Thank you for your assistance
with this project.
Sincerely,
Kim Williams
Wetland Scientist
Encl.
C: Mr. Ian McMillan, DWQ
www.lmgroup.net • infoea lmgroup.net • Phone: [phone] • Fax: [phone]
3805 Wrightsville Ave., Suite 15, Wilmington, NC 28403 • P.O. Box 2522, Wilmington, NC 28402
07-08(to03.
ADDENDUM TABLES FOR EAGLE CREEK SUBDIVISION PCN FORM
2. WETLAND IMPACTS
2a. 2b. 2c. 2e. 2f. 2g. 2h.
Wetland impact Type of Initially After-the-
number - Type of Type of jurisdiction Permitted Fact Total Area of im act acres
Permanent (P) or impact wetland (Corps - 404, Impacts Impacts
Temporary (T) (if known) 10
Temporary
Permanent
DWQ - non-
404, other

RC1 ®P ? T Road
Crossing/
404
Z Corps

0.035

0.035
Wet
lands ® DWQ
Culvert

RC2 ®P ? T Road
Crossing/
404
Z Corps

0.095

0.095
Wetlands ® DWQ
Culvert

RC3 ®P ®T Road
Crossing/
404
Z Corps

0.17 (P)

0.038 (T)

0.038'

0.17
We
tlands ® DWQ
Utilities
U1 ®P ®T Utility 404 ® Corps 0.063 (P) 0.026 (T) 0.026 0.063
Crossing Wetlands ® DWQ
11 ® P ? T Stormwater Isolated ? Corps
® DWQ 0.23
12 ® P ? T Lot Fill Isolated ? Corps
® DWQ 0.056 0.056
13 ® P ? T Stormwater Isolated ? Corps
® DWQ 0.0003
TOTAL 0.363 404: 0.063 404: 404: 0.376 ac
Isol: 0.056 0.050 ac Isolated: 0.2863 ac
*Of this temporary impact, 0.013 acre is in a utility easement and is considered a permanent conversion.
RC: Road Crossing; U: Utility; L• Isolated
3. STREAM IMPACTS
3a. 3b. 3c. 3d. 3e. 3f. 3g. 3h. 3i.
Stream impact Type of Stream Perennial Type of Average After- New
number - impact name (PER) or jurisdiction stream the-Fact Impacts Total LF of impact
Permanent (P) or inter- (Corps - width Impacts
Temporary (T) mittent 404,10 (feet)
(INT)? DWQ - Temporary Permanent
non-404,
other
Road UT of ® PER ® Corps
RC1 ® P ? T Crossing/ Clark
?INT
®DWQ -4 104 104
Culvert Branch

U1 ? P ®T Utility Line UT of
Clark ® PER ® Corps
-4
52
52
Installation Branch ?INT ®DWQ

S3 ®P ®T
Restoration UT of
Clark ? PER

®INT ® Corps

®DWQ
-4
305
245
60
Branch

S4 ? P ®T
Restoration UT of
Clark ® PER ® Corps
-4
20
20
Branch ?INT ®DWQ
Stabilization UT of ? PER ® Corps
S5 ? P ®T of Banks Clark
®INT
®DWQ -3 350 350
(Bell Site) Branch
TOTAL 481 667 164
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Worksheet for Trapezoidal Channel - 1
Friction Method Manning Formula
Salve For Normal Depth
Roughness Coefficient 0.069
Channel Slope 0 01000 ft/ft
Left Side Slope 3.00 ft/ft (H:V)
Right Side Slope 3.00 ft/ft (H:V)
Normal Depth 0.69 ft y C
Flow Area 4.20 ft2
Wetted Perimeter 8.37 ft
Top Width 8.15 ft
Critical Depth 0.36 ft

Critical Slope
0.10644
ft/ft
? (p
7 JAL? a r
Velocity 1
,36 - 7' G
' 6
Velocity Head
Specific Energy 0.03
0.72 ft
ft
It) E ?
C-7
0
33
Frcude Number
Subcritical
T
Fl . 4
ow
ype

Downstream Depth 0.00 ft
Length 0..00 ft
Number Of Steps 0

Upstream Depth 0.00 ft
Profile Description
Profile Headloss 0..00 ft
Downstream Velocity Infinity ft /s
Upstream Velocity Infinity ft /s
Normal Depth 0.69 ft
Critical Depth 0.36 ft
Channel Slope 0.01000 ft/ft
Critical Slope 0,10644 ft/ft
Bentley Systems, tnc. Haestad Methods Solution Center Bentley FlowMaster [08.01.066.003
6125I2D09 1:47:38 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Eagle Creek Subdivision
(Action ID No. SAW-2006-41798)
Project Narrative
June 2009
1. Introduction
Construction at the Eagle Creek subdivision was initiated soon after the original Nationwide Permit
was issued on August 13, 2007. During the course of construction several conditions of the permit
were not observed and the project was deemed to be non-compliant on August 29, 2008. The
submittal of this updated permit package addresses the issues of non-compliance and specific
violations referenced in the December 12, 2008 letter from the USACOE.
II. Non-Compliance Issues
III. Predevelopment Conditions (UT to Clark Branch)
Prior to the construction of the Eagle Creek subdivision the entire watershed was maintained in
agricultural fields. A review of historic aerial photography and NRCS soil survey (Figures 3-4),
provides evidence that the tributary was originally located along the southwestern side of Pecan
Lane. However, subsequent modification of this drainage pattern occurred when agricultural
drainage was connected to the tributary, via a man-made ditch sometime prior to 1972. This ditch
discharged runoff from approximately 50 ac. of active fields for a period of 3 decades, prior to the
initiation of subdivision construction.
As result of the agricultural land use, normal rainfall events generated typically generated
discharges in excess of 15 cubic feet per second (cfs) which likely overwhelmed the small
intermittent tributary. For comparison, forested watersheds of this size typically support discharge
rates between 3-5 cfs. The erosive velocities likely caused significant downcutting, which allowed
the channel to more efficiently dissipate the energy during high-flow events. This evolution in
channel geometry has continued for several decades, completely disconnecting the stream from its
floodplain and creating the steeply sloped banks that have been observed on-site.
The extensive erosion and downcutting of the system has also altered the flow characteristics of
the tributary. Typically, small watershed streams receive a portion of their hydrologic input from
groundwater sources but do not regularly interact with the existing water table. Conversely, this
channel now serves as a significant interceptor to groundwater flow, lowering the surrounding
water table. This drainage is manifested in the assemblage of riparian vegetation, which is
dominated by drier species such as loblolly pine (Pinus taeda) and common greenbriar (Smilax
rotundifolia).
While in-stream habitat has been severely degraded by the agricultural drainage, significant
improvement was observed downstream (see Appendix A). These areas, located within -500' of
HWY 17 Business, have a more natural plan and profile with less severe bank erosion. The
channel geometry also reverts to a more natural geometry and appears to reconnect to the
adjacent floodplain. As previously stated, this connection serves to dissipate energy during flow
events, helping to preserve the natural bed and bank of the stream system.
IV. Unauthorized Impacts
During the course of construction approximately 225 linear feet (If) of tributary were filled and
graded without authorization from the USACOE. Upon notification from the USACOE, this material
was removed in an effort remain compliant with the existing Nationwide Permit. However, these
efforts were deemed insufficient due to the loss of in-stream habitat that occurred as a result of the
extensive construction activity. A subsequent request for a mitigation plan was sent to Eagle
Creek Subdivision, LLC, which is presented below.
V. Proposed Mitigation
In order to address the loss of aquatic function within the impacted tributary, a small-scale
wetland/stream mitigation project is being proposed. The project includes both a constructed
wetland and a restored stream channel which will reconnect to the existing tributary within the
Eagle Creek property. Overall, the constructed wetland will be approximately .28 ac. in size and
245 If of stream channel will be restored.
a) Constructed Wetland
Modification of the existing stormwater management plan has allowed runoff from approximately
2.1 acres of paved street and residential area to drain into the constructed wetland. This feature
has been designed to meet current NC DWQ specifications for stormwater containment within non-
SA waters, which includes controlling and treating the first 1.5 inches of rain. These guidelines also
specify a minimum treatment volume of 3,630 cubic feet.
This feature will be installed in the area currently occupied by the isolated wetland adjacent to the
impacted tributary. While all vegetation will be removed due to the proposed grading, a native
assemblage of hardwood species will be replanted throughout the footprint of the restoration
project. Impacts to this isolated feature have been included in the attached PCN form.
Final contours will be established to delineate the appropriate assemblages of deep pools, low
marsh, and high marsh areas. Each of these areas serves a variety of functions related to habitat
maintenance, water quality, and storage. Grading will also direct drainage towards the northeast
edge of the feature where it will discharge through the 30-foot level spreader and then into the
restored stream channel. Discharges of 3-5 cfs are expected following a 10 year storm event,
while smaller flows will discharge during more frequent events.
See Figures E10-E11 for a preliminary design layout and planting plan for this feature.
b) Stream Restoration
The designed channel will connect to the constructed wetland near the southwestern boundary of
lot D19. Sinuosity was designed to maximize available space within the project area. A 2' wide
channel will be constructed for a majority of the reach with depths corresponding to the 1 year
storm discharge levels. Discharges above this size will access the floodplain which will be graded
at a 3:1 slope and planted with native hardwood seedlings.
Approximately 245 If of designed channel will be constructed at the site, This length will connect to
the existing channel along the southern boundary of lot C81 Reconnection at this point will utilize
existing contours within the site and will involve the removal old rip-rap and invasive vegetation that
currently occupy this area. As flow velocities will be attenuated within the wetland it is anticipated
2
that little to no erosion will occur in the vicinity of this intersection. This location also occurs within
the overall subdivision boundary which will minimize concerns for adjacent property owners.
Vegetation characteristic of a small stream swamp community will be planted within the .25 acre
riparian wetland area adjacent to the channel. This will include a mixture of bald cypress
(Taxodium distichum), black gum (Nyssa sylvatica), red bay (Persea borbonia), and green ash
(Fraxinus pennsylvanica). Live stakes of elderberry (Sambucus canadensis), buttonbush
(Cephalanthus occidentalis), and silky willow (Salix sericea) will also be installed along the stream
bank to improve stability of the constructed channel. Live stakes will be installed on 2' centers and
the remaining hardwoods will be on 8' centers throughout the riparian zone.
See Figures E10-E11 for a preliminary design layout and planting plan for this feature.
VI. Proposed Monitoring
Monitoring within the constructed wetland and restored stream channel will include both a
vegetative and hydrologic component. However, given the size of the project these will be limited
in scope. Vegetative monitoring will be conducted to ensure that a minimum of 80 hardwoods
seedlings are present within the .25 acre riparian zone adjacent to the restored channel.
Vegetative monitoring within the constructed wetland will be conducted to ensure survivorship
levels are appropriate to the guidelines presented in the NC DWQ BMP Manual, which typically
involve an assessment one (1) year after construction.
Hydrologic monitoring within the constructed will be conducted using a WM-40 groundwater
monitoring device that will be installed within a section of low marsh habitat. This device will be
configured to take readings at 30 minute intervals, which will provide data from individual rain
events and allow for an assessment of the overall hydrology of the system. A crest gauge will be
installed near the intersection of the constructed channel and the existing tributary. This device will
provide documentation of flow levels relative to individual rain events. Data collected from these
two devices will then be used to develop a regression analysis which correlates rain events with
stream discharge levels. Photo-documentation of any indicators of flow (wrack lines, etc.) will also
be provided in the monitoring report.
Given the financial standing of the current landowner, only one year of monitoring is proposed at
this time. This event will occur approximately one (1) year after construction and planting have
been completed. This document will be provided to both NC DWQ and USACOE staff.
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