HomeMy WebLinkAbout20120504 Ver 1_401 Application_20120512ASCOM
May 21 2012
NC Division of Water Quality 401/Wetlands Unit
1650 Mail Service Center
Raleigh NC 27699 1650
AECOM 919 854 6200 tel
701 Corporate Center Dnve 919 854 6259 fax
Suite 475
Raleigh North Carolina 27607
www aecorn corn
Reference Beaverdam Creek Wetland Restoration Plan
Brunswick County NC
To Whom it May Concern
2 0 1 2 0 5 0 4
Enclosed is the Preconstruction Notification for the Beaverdam Creek Wetland Restoration in
Brunswick County Enclosed are the following
• Five (5) copies of the PCN and backup documentation
• 2 Copies of 11 X 17 Plan Sheets Please note that these 11 X 17 sheets are the full size
Plan Sheets
• Application fee of $570 00
Please let me know if you need additional copies of these documents or if you have any questions I
can be reached at 919 854 6254 or by email at ian Iewell@aecom com
Sincerely
ILG)�o :DE �J
Ian Jewell Project Manager
UALI ry
Branc
cc Jerry Pierce P E Brunswick County Public Utilities
o2ot W ATF19
O Y
201 2050 4
Office Use Only
Corps action ID no
DWQ project no
Form Version 13 Dec 10 2008
Page 1 of 10
PCN Form — Version 1 3 December 10 2008 Version
Pre - Construction Notificahon PCN Form
A Applicant Informahon
1
Processing
1 a
Type(s) of approval sought from the
Corps
®Section 404 Permit E] Section 10 Permit
1 b Specify Nationwide Permit (NWP) number 27 or General Permit (GP) number 3885
1c
Has the NWP or GP number been verified by the Corps?
® Yes ❑ No
1 d
Type(s) of approval sought from the DWQ (check all that apply)
® 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization
le
Is this notification solely for the record
because written approval is not required?
For the record only for DWQ 401
Certification
❑ Yes ® No
For the record only for Corps Permit
❑ Yes ® No
1f
Is payment into a mitigation bank or in lieu fee program proposed for mitigation
of impacts? If so attach the acceptance letter from mitigation bank or in lieu
fee program
❑ Yes ® No
1g
Is the project located in any of NC s twenty coastal counties If yes answer 1 h
below
® Yes ❑ No
1h
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes ® No
2
Project Information
2a
Name of project
Beaverdam Creek Wetland Restoration
2b
County
Brunswick
2c
Nearest municipality / town
Southport
2d
Subdivision name
N/A
2e
NCDOT only T I P or state.
protect no
'--
N/A u ��
3
Owner Information
lull
3a
Name(s) on Recorded Deed
St James Development Co LLC 1 1AY ;' ?
3b
Deed Book and Page No
DB 1407 DP 0984
3c
Responsible Party (for LLC if
applicable)
DENR WiTER pU Irry
Norm Hash tNetland� 8 St rnwate Branch
P O Box 10879
3d
Street address
3e
City state zip
Southport NC 28461
3f
Telephone no
910 253 3001
3g
Fax no
3h
Email address
norm hash @stfamesplantation com
Page 1 of 10
PCN Form — Version 1 3 December 10 2008 Version
4
Applicant Information (if different from owner)
4a
Applicant is
❑ Agent ® Other specify Brunswick County Manager
4b
Name
Mr Marty Lawing
4c
Business name
(if applicable)
Brunswick County
4d
Street address
30 Government Center Drive
4e
City state zip
Bolivia NC 28422
4f
Telephone no
910 253 2016
4g
Fax no
4h
Email address
mlawing @brunsco net
5
Agent/Consultant Information (if applicable)
5a
Name
Ian Jewell
5b
Business name
(if applicable)
AECOM
5c
Street address
701 Corporate Center Drive Suite 475
5d
City state zip
Raleigh NC 27607
5e
Telephone no
919 854 6254
5f
Fax no
919 854 6259
5g
Email address
ian Sewell @aecom com
Page 2 of 10
PCN Form — Version 1 3 December 10 2008 Version
B
Project Information and Prior Project History
1
Property Identification
1a
Property identification no (tax PIN or parcel ID)
20400059
lb
Site coordinates (in decimal degrees)
Latitude 33 960067 Longitude 7808363
(DD DDDDDD) ( DD DDDDDD)
1c
Property size
19 4 acres
2
Surface Waters
2a
Name of nearest body of water (stream river etc ) to
Beaverdam Creek
proposed project
2b
Water Quality Classification of nearest receiving water
SC HQW SW
2c
River basin
Cape Fear
3
Project Description
3a
Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application
See attached restoration plan
3b
List the total estimated acreage of all existing wetlands on the property
5 acres
3c
List the total estimated linear feet of all existing streams (intermittent and perennial) on the property
1 000
3d
Explain the purpose of the proposed project
Remove residual solids discharged from water treatment plant
3e
Describe the overall project in detail including the type of equipment to be used
See attached restoration plan
4
Jurisdictional Determinations
4a
Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
Yes ❑ No Unknown
project (including all prior phases) in the past?
Comments
4b
If the Corps made the jurisdictional determination what type
❑ preliminary ❑ Final
of determination was made?
4c
If yes who delineated the jurisdictional areas?
Agency /Consultant Company AECOM
Name (if known) Jennifer Cassada
Other
4d
If yes list the dates of the Corps jurisdictional determinations or State determinations and attach documentation
See attached data forms
5
Project History
5a
Have permits or certifications been requested or obtained for
❑ Yes ® No ❑ Unknown
this project (including all prior phases) in the past?
5b
If yes explain in detail according to help file instructions
6
Future Project Plans
6a
Is this a phased project?
❑Yes No
6b
If yes explain
Page 3 of 10
PCN Form — Version 1 3 December 10 2008 Version
C Proposed Impacts Inventory
1 Impacts Summary
la Which sections were completed below for your project (check all that apply)
® Wetlands ❑ Streams tributaries ❑ Buffers
❑ Open Waters ❑ Pond Construction
2 Wetland Impacts
If there are wetland impacts proposed on the site then complete this question for each wetland area impacted
2a
2b
2c
2d
2e
2f
Wetland impact
Type of jurisdiction
number —
Type of impact
Type of wetland
Forested
(Corps 404 10
Area of impact
Permanent (P) or
(if known)
DWQ — non -404 other)
(acres)
Temporary T
W1 ❑ P ®T
Removal of fill
PEM /PSS
❑ Yes
® No
® Corps
❑ DWQ
1 5
W2 ❑ P ❑ T
❑ Yes
❑ Corps
❑ No
❑ DWQ
W3 ❑ P ❑ T
❑ Yes
❑ Corps
❑ No
❑ DWQ
W4 ❑ P ❑ T
❑ Yes
❑ Corps
❑ No
❑ DWQ
W5 ❑ P ❑ T
❑ Yes
❑ Corps
❑ No
❑ DWQ
W6 ❑ P ❑ T
❑ Yes
❑ Corps
❑ No
❑ DWQ
2g Total wetland impacts
15
2h Comments Impacts will consist of the removal of residual solids Impacted areas will be restored
3 Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site then complete this
question for all stream sites impacted
3a
3b
3c
3d
3e
3f
3g
Stream impact
Type of impact
Stream name
Perennial
Type of jurisdiction
Average
Impact
number
(PER) or
(Corps 404 10
stream
length
Permanent (P) or
intermittent
DWQ — non -404
width
(linear
Temporary (T)
(INT)?
other)
(feet)
feet)
S1 ❑ POT
Placement of
Sheetpde
Beaverdam Ck
® PER
❑ INT
® Corps
❑ DWQ
4
180
S2 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
S3 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
S4 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
S5 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
S6 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
3h Total stream and tributary impacts
180
31 Comments Impacted will be to streambank along east side of stream Bank potentially will be impacted by placement of
sheetpile Bank will be restored following removal of fill and sheetpde See Attached Restoration Plan
Page 4 of 10
PCN Form — Version 1 3 December 10 2008 Version
4 Open Water Impacts
If there are proposed impacts to lakes ponds estuaries tributaries sounds the Atlantic Ocean or any other open water of
the U S then individually list all open water impacts below
4a
4b
4c
4d
4e
Open water
Name of waterbody
impact number —
(if applicable)
Type of impact
Waterbody type
Area of impact (acres)
Permanent (P) or
Temporary T
01 ❑P ❑T
02 ❑P ❑T
03 ❑P ❑T
04 ❑P ❑T
4f Total open water impacts
4g Comments No open water impacts
5 Pond or Lake Construction
If pond or lake construction proposed then complete the chart below
5a
5b
5c
5d
5e
Wetland Impacts (acres)
Stream Impacts (feet)
Upland
Pond ID
Proposed use or purpose
(acres)
number
of pond
Flooded
Filled
Excavated
Flooded
Filled
Excavated
Flooded
P1
P2
5f Total
5g Comments
5h Is a dam high hazard permit required
❑ Yes ❑ No If yes permit ID no
51 Expected pond surface area (acres)
5j Size of pond watershed (acres)
5k Method of construction
6 Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer then complete the chart below If yes then individually list all buffer impacts
below If any Impacts require mitigation then you MUST fill out Section D of this form
6a
❑ Neuse ❑ Tar Pamlico ❑ Other
Project is in which protected basin?
❑ Catawba ❑ Randleman
6b
6c
6d
6e
6f
6g
Buffer impact
number —
Reason
Buffer
Zone 1 impact
Zone 2 impact
Permanent (P) or
for
Stream name
mitigation
(square feet)
(square feet)
Temporary T
im act
required?
61 ❑ P ❑ T
❑ Yes
❑ No
B2 ❑ P ❑ T
❑ Yes
❑ No
B3 ❑P ❑T
❑Yes
❑ No
6h Total buffer impacts
61 Comments No buffer impacts
Page 5 of 10
PCN Form — Version 1 3 December 10 2008 Version
D Impact Justification and Mitigation
1 Avoidance and Minimization
1a Specifically describe measures taken to avoid or minimize the proposed impacts in designing project
1 b Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques
2 Compensatory Mitigation for Impacts to Waters of the U S or Waters of the State
2a Does the project require Compensatory Mitigation for
impacts to Waters of the U S or Waters of the State?
❑ Yes ® No
2b If yes ntigation is required by (check all that apply)
❑ DWQ ❑ Corps
2c If yes which mitigation option will be used for this
projects
❑ Mitigation bank
El Payment to m lieu fee program
❑ Permittee Responsible Mitigation
3 Complete if Using a Mitigation Bank
3a Name of Mitigation Bank N/A
3b Credits Purchased (attach receipt and letter)
Type N/A
Quantity
3c Comments
4 Complete if Making a Payment to In lieu Fee Program
4a Approval letter from in lieu fee program is attached
❑ Yes
4b Stream mitigation requested
linear feet
4c If using stream mitigation stream temperature
❑ warm ❑ cool ❑cold
4d Buffer mitigation requested (DWQ only)
square feet
4e Riparian wetland mitigation requested
acres
4f Non riparian wetland mitigation requested
acres
4g Coastal (tidal) wetland mitigation requested
acres
4h Comments
5 Complete if Using a Permittee Responsible Mitigation Plan
5a If using a permittee responsible mitigation plan provide a description of the proposed mitigation plan
Page 6 of 10
PCN Form — Version 1 3 December 10 2008 Version
6 Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ
6a Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation?
❑ Yes ® No
6b If yes then identify the square feet of impact to each zone of the riparian buffer that requires mitigation Calculate the
amount of mitigation required
Zone
6c
Reason for impact
6d
Total impact
(square feet)
Multiplier
6e
Required mitigation
(square feet)
Zone 1
3 (2 for Catawba)
Zone 2
1 5
6f Total buffer mitigation required
6g If buffer mitigation is required discuss what type of mitigation is proposed (e g payment to private mitigation bank
permittee responsible riparian buffer restoration payment into an approved in lieu fee fund)
6h Comments
Page 7 of 10
PCN Form — Version 1 3 December 10 2008 Version
E
Stormwater Management and Diffuse Flow Plan (required by DWQ)
1
Diffuse Flow Plan
1a
Does the project include or is it adjacent to protected riparian buffers identified
❑ Yes ® No
within one of the NC Riparian Buffer Protection Rules?
1 b
If yes then is a diffuse flow plan included? If no explain why
❑ Yes ❑ No
Comments
2
Stormwater Management Plan
2a
What is the overall percent imperviousness of this project?
0%
2b
Does this project require a Stormwater Management Plan?
❑ Yes ® No
2c
If this project DOES NOT require a Stormwater Management Plan explain why no increase in impervious surface
2d
If this project DOES require a Stormwater Management Plan then provide a brief narrative description of the plan
❑ Certified Local Government
2e
Who will be responsible for the review of the Stormwater Management Plan?
❑ DWQ Stormwater Program
❑ DWQ 401 Unit
3
Certified Local Government Stormwater Review
3a
In which local government s jurisdiction is this project?
N/A
❑ Phase II
3b
Which of the following locally implemented stormwater management programs
❑ NSW
❑ USMP
apply (check all that apply)
❑ Water Supply Watershed
❑ Other
3c
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
4
DWQ Stormwater Program Review
❑ Coastal counties
❑ HQW
4a
Which of the following state implemented stormwater management programs apply
❑ ORW
(check all that apply)
❑ Session Law 2006 246
❑ Other
4b
Has the approved Stormwater Management Plan with proof of approval been
attached?
❑ Yes ❑ No
5
DWQ 401 Unit Stormwater Review
5a
Does the Stormwater Management Plan meet the appropriate requirements?
❑ Yes ❑ No
5b Have all of the 401 Unit submittal requirements been met?
❑ Yes ❑ No
Page 8 of 10
PCN Form — Version 1 3 December 10 2008 Version
F Supplementary Information
1 Environmental Documentation (DWQ Requirement)
1a Does the project involve an expenditure of public (federal /state /local) funds or the
® Yes ❑ No
use of public (federal /state) land?
lb If you answered yes to the above does the project require preparation of an
environmental document pursuant to the requirements of the National or State
❑ Yes ® No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1c If you answered yes to the above has the document review been finalized by the
State Clearing House? (If so attach a copy of the NEPA or SEPA final approval
❑ Yes ❑ No
letter )
Comments N/A
2 Violations (DWQ Requirement)
2a Is the site in violation of DWQ Wetland Rules (15A NCAC 2H 0500) Isolated
Wetland Rules (15A NCAC 2H 1300) DWQ Surface Water or Wetland Standards
® Yes ❑ No
or Riparian Buffer Rules (15A NCAC 2B 0200)?
2b Is this an after the fact permit application?
❑ Yes ® No
2c If you answered yes to one or both of the above questions provide an explanation of the violation(s) NOV 2010 0024
Issued on May 11 2010 by DWQ for the violation of stream and wetland standards for the release of industrial sludge
3 Cumulative Impacts (DWQ Requirement)
3a Will this project (based on past and reasonably anticipated future impacts) result in
❑ Yes ® No
additional development which could impact nearby downstream water quality?
3b If you answered yes to the above submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy If you answered no provide a short narrative description
4 Sewage Disposal (DWQ Requirement)
4a Clearly detail the ultimate treatment methods and disposition (non discharge or discharge) of wastewater generated from
the proposed project or available capacity of the subject facility
N/A no wasterwater generated
Page 9 of 10
PCN Form — Version 1 3 December 10 2008 Version
5 Endangered Species and Designated Critical Habitat (Corps Requirement)
5a Will this project occur in or near an area with federally protected species or
❑ Yes ® No
habitat?
5b Have you checked with the USFWS concerning Endangered Species Act
❑ Yes ® No
impacts?
❑ Raleigh
5c If yes indicate the USFWS Field Office you have contacted
❑ Asheville
5d What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
Review of Natural Heritage database /GIS data and site evaluation by experienced biologists
6 Essential Fish Habitat (Corps Requirement)
6a-Will this project occur in or near an area designated as essential fish habitat?
® Yes ❑ No
6b What data sources did you use to determine whether your site would impact Essential Fish Habitat?
Essential Fish Habitat is located downstream from the project site Mapping provided by NC Marine Fisheries indicate
that Beaverdam Creek is Primary Nusery Habiat from the ICW to Players Club Drive Players Club Drive is over 1 mile
downstream from the project site Wetlands on the site are not considered EFH
7 Historic or Prehistoric Cultural Resources (Corps Requirement)
7a Will this project occur in or near an area that the state federal or tribal
governments have designated as having historic or cultural preservation
❑ Yes ® No
status (e g National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b What data sources did you use to determine whether your site would impact historic or archeological resources?
GIS Database
8 Flood tone Designation (Corps Requirement)
8a Will this project occur in a FEMA designated 100 year floodplain?
® Yes ❑ No
8b If yes explain how project meets FEMA requirements No fill will be added to 100 -year floodplain
8c What source(s) did you use to make the floodplain determination? Brunswick County GIS mapping
114,#AV K LAW 14 G
lroe—l—�l
y-
Applicant/Agent s Printed Name
Date
Applic t/Agent s Signatur
(Agent's signature is valid only if an authorization er from the applicant
is provided
Page 10 of 10
PCN Form — Version 1 3 December 10 2008 Version
- — — — _
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do
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Topographic Map
Beaverdam Creek Water Treatment Plant
4305 Southport Supply Road Southeast
Southport North Carolina
0 0125025 0 5 075 1
Miles
r
Figure 1
701 Corporate Center Drive Suite 475
Raleigh NC 27607
Phone (919)854 6254
Fax (919)854 6259 A:C'OM
Web http / /www aecom com
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AECOM Beaverdam Creek Wetland Restoration Plan i
Contents
10 Introduction 1
1 1 Project Background and History 1
12 Project Goals and Objectives 1
13 Methods 2
2 0 Site Description 2
21 General Site Description 2
22 Beaverdam Creek 2
23 Beaverdam Creek Wetlands 3
24 Other Site Features 3
25 Soils 4
26 Solids 4
3 0 Proposed Wetland Restoration 4
31 Proposed Areas of Feasible Removal of Solids 4
32 Proposed Method of Removing Solids 5
3 2 1 Dewatenng of Solids and Ultimate Disposal 6
322 Construction Costs 7
33 Vegetation 7
34 Monitoring g
35 Schedule g
36 Permits g
List of Figures
Figure 1
Site Map
Figure 2
Vegetation Cover Map
Figure 3
Wetland Restoration Map
Figure 4
Wetland Restoration Details
Figure 5
Wetland Restoration Details
Septermber 2011
AECOM Beaverdam Creek Wetland Restoration Plan
List of Appendices
Appendix A Photographs
Appendix B Cost Estimate
Septermber 2011
AECOM Beaverdam Creek Wetland Restoration Plan
10 Introduction
At the request of Brunswick County AECOM Technical Services of North Carolina Inc (AECOM)
has developed a wetland restoration plan to remove solids and restore the wetlands at the
Brunswick County Beaverdam Creek Water Treatment facility in Brunswick County North
Carolina
11 Project Background and History
The project site is located at 4305 Southport Supply Road Southeast in Southport North
Carolina The site consists of one parcel approximately fourteen acres in size that contains a
water treatment plant that treats groundwater for municipal use The plant Is bordered to the west
by Beaverdam Creek and a wetland complex Residual solids (hereinafter referred to as solids )
from the treatment process have historically been discharged Into the wetland The NC Division
of Water Quality (DWQ) Issued a Notice of Violation (NOV) on May 11 2010 requesting that
Brunswick County provide a Stream and Wetland Restoration Plan for submittal to DWQ for their
review and approval
A technical memorandum dated January 14 2011 was Issued to Brunswick County by AECOM
documenting the extent of the solids within the wetland The memorandum also provided an
assessment of the existing wetland functions Following Issuance of the technical memorandum
on February 1 2011 a meeting was held with Mr Chad Coburn and Kipp Glazier with DWQ and
Heather Coats with NC Division of Coastal Management During that meeting it was determined
that solids should be removed from both the open marsh as well as the wooded areas of the
wetland
12 Project Goals and Objectives
The overarching goals of the Beaverdam Creek Wetland Restoration project are
• Improve wetland functions which include wildlife habitat aquatic habitat and flood water
retention
• Improve water quality
The objectives which specify how each of the goals will be obtained are
• Remove solids as practical from the wetland while preventing resuspension of solids into
surface waters to the greatest extent practical and minimizing Impacts to the surrounding
wetlands
• Reestablish wetland vegetation by planting with native vegetation
Oct be 2011
AECOM Beaverdam Creek Wetland Restoration Plan 2
13 Methods
AECOM visited the Beaverdam Creek Water Treatment Plant in Southport North Carolina
(Figure 1) on November 17 2010 and January 5 and 6 2011 to perform the wetland
assessment AECOM field personnel mapped the extent of the residual solids within the wetland
using Global Positioning System (GPS) technology with sub meter accuracy Numerous borings
were performed using soil augers soil probes or shovels to determine the presence /absence of
solids When only trace amounts of solids (about 1 Inch or less) were detected the location of that
boundary/line was surveyed Additionally numerous soil bonngs were performed throughout the
area containing solids At each location notes on vegetation cover type surface water depth and
depth of solids were recorded in a field logbook The location of each boring was mapped using
GPS Figure 1 depicts the boundary of the solids along with representative borings
Wetlands and streams were delineated within the area The protocol used for the wetland surveys
was based on the Regional Supplement to the Corps of Engineers Wetland Delineation Manual
Atlantic and Gulf Coast Region (Environmental Laboratory 2010) These methods define
characteristic hydrophytic vegetation hydnc soil and hydrologic indicators that are normally
present in wetlands Wetland characteristics were recorded on field datasheets and the location
of the wetland boundary was recorded using GPS Linear water features (i a streams and
ditches) were also identified and mapped
2 0 Site Description
The following site description is based upon a review of available resources including topographic
maps aerial photographs and reports Site visits were conducted on November 17 2010 and
January 5 and 6 2011 to collect information on vegetation and depth of solids
21 General Site Descrpption
The project site is approximately fourteen acres In size and contains a water treatment plant that
treats groundwater for municipal use The property is bordered on the north by NC 211 the south
by residential development light Industry to the east and to the west by a low lying area that
contains Beaverdam Creek and a wetland complex See Figure 1 for site features
22 Beaverdam Creek
Beaverdam Creek is a perennial stream that flows along the west edge of the site from north to
south It is a blackwater stream that originates north of NC 211 and eventually flows into the
Intracoastal Waterway As the stream enters the site the channel is Indistinct due to ponding
from a remnant beaver dam Below the dam it forms a braided channel South (downstream) of
the site the channel is more defined Where there is a defined channel it is approximately 3-4 feet
in width At the site it is a freshwater stream that is non tidal
Octobe 2011
AECOM Beaverdam Creek Wetland Restoration Plan 3
Beaverdam Creek has been classified by DWQ as a Class SC with supplemental classifications
of High Quality Water (HWQ) and Swamp Water (Sw) Based on mapping at the NC Division of
Marine Fisheries neither the stream nor the adjacent wetland is considered a Primary or
Secondary Fishery Nursery Area
23 Beaverdam Creek Wetlands
A wetland complex borders Beaverdam Creek The complex consists of a freshwater marsh with
a mosaic of forested and shrub /scrub areas In the past beaver activity created a ponded area at
the northern edge of the property dust south of the highway Several remnant beaver dams were
observed in the wetland According to WTP personnel the beaver dam washed out due to
hurricane related runoff around 2005 This area currently consists of a non tidal freshwater
marsh
On the plant property the wetland area is approximately 5 acres in size and can be characterized
as moderate to high quality emergent/forested wetland The wetland area is only a small portion
of a much larger wetland complex system that occurs upstream and downstream of the project
site along Beaverdam Creek Within the project area three different communities comprise the
wetland area a freshwater marsh an area dominated by common reed and a nvenne
shrub /forested community Figure 2 shows the wetland communities Dominant vegetation in
the freshwater marsh consists of cattails (Typha latifolia) and sedges (Carex spp ) with scattered
young willows (Sal►x n►gra) Other emergent vegetation included soft rush (Juncus effuses)
seedbox (Ludwig►a sp ) and woolgrass (Scirpus cypennus) On the northern portion of the site
much of the freshwater marsh is inundated with water from an old beaver dam Depth of water
vanes from 1 to 2 feet to several inches Based on recent field data it appears that the remnant
beaver dam is artificially elevating the water in the wetland by about 1 foot
The area dominated by common reed (Phragm►tes austrahs) is very dense monoculture of reed
A few scattered willows can be found along the edge of the stands of reed
Dominant vegetation in the forested areas consists of willows and wax myrtle (Morella cenfera)
The forested area appears to occur on a slightly drier portion of the floodplain Very little
understory vegetation was present in the forested area most likely due to heavy shading from the
closed canopy
The wetland community on the site best fits the Coastal Plain Semipermanent Impoundment
(Marsh Zone) community type described in Shafale and Weekley s Classification of the Natural
Communities of North Carolina — Third Approximation This community type covers portions of
Coastal Plain floodplains shallowly impounded by beaver dams or long established small artificial
dams Subtype covers portions or examples with emergent vegetation but little or no tree cover
The Coastal Plain Semipermanent Impoundment type is distinguished from all other Coastal Plain
communities by occurring in places with long term flooding produced by impoundment of drainage
by beaver dams or old man made dams The Marsh Zone is distinguished by dominance of
emergent shrub or herbaceous vegetation and the lack of a substantial tree canopy
24 Other Site Features
A third site feature is an outfall /discharge ditch originating at the water treatment plant This
feature begins as a large ditch dug in the upland area adjacent to the plant Two separate outfalls
October 2011
AECOM Beaverdam Creek Wetland Restoration Plan q
discharge Into the ditch Where the ditch enters the wetlands a small channel has formed It
flows to the north Into the wetland and eventually loses form
25 Soils
Soils along Beaverdam Creek are mapped by the Natural Resource Conservation Service
(NRCS) as a Muckalee loam This is a nearly level poorly drained soil on floodplains of
freshwater streams Typically the surface layer is very dark grayish brown loam that is underlain
with grayish brown loamy sand This soil is flooded frequently for brief periods but on wider
floodplains water ponds in the low places for a long time during wet periods
26 Solids
The boundary of the area covered by residual solids is depicted in Figure 1 along with
representative depths The solids cover an area of approximately 17 acres The maximum
depth of solids is about 6 feet Typically the solid boundary Is quite abrupt transitioning from 6
inches in depth to less than an Inch over a short distance The residual solids are primarily
confined to the Brunswick County Property with only trace amounts occurring off site
downstream An old beaver dam downstream appears to form the southern extent of trace
amounts One trace deposit was located about 200 feet downstream of the property line This
trace deposit was found in a small depression near the stream The solids were about 0 5 to 1
Inch thick and were overlain with organic deposits about 6 Inches in depth
Very little solids were found in Beaverdam Creek and no solids were found to the west of the
creek
3 0 Proposed Wetland Restoration
31 Proposed Areas of Feasible Removal of Solids
Based on discussions with DWQ personnel on February 1 2011 and confirmed In a meeting held
with DWQ on April 26 2011 solids in the freshwater marsh reed stand and forested /shrub area
will be removed The area proposed for removal Is shown on the Wetland Restoration Planview
In Figure 3 The removal area consists of the primary area where solids have been deposited at
depths exceeding 4 to 6 inches This area is about 14 acres in size and it is estimated to contain
about 5 400 cubic yards of residual solids Solids are not proposed for removal at the very
southern end of the site This area is well vegetated and the distribution of solids is patchy The
removal of solids would require removal of a large amount of vegetation while only removing a
small percentage of the solids The wetlands in this area appear to be functioning well and are
not significantly affected by the solids deposition
Oct be 2011
AECOM Beaverdam Creek Wetland Restoration Plan
32 Proposed Method of Removing Solids
In proposing a method to remove solids from the protect site the two primary considerations that
have been expressed by DWQ are 1) that solids are prevented from resuspending Into surface
waters and transported downstream during construction to the maximum extent practical 2) that
Impacts to the surrounding wetland be minimized In addition to these two factors other
engineering considerations have been taken Into account In developing a removal plan for the
site Including cost and safety nsks
The removal area has a variety of hydrological conditions mainly affected by vanations in
elevation and the presence of a relict beaver dam that has created a backwater pond downstream
of the Highway 211 bridge A large portion of the solids are located adjacent to this backwater
area In the freshwater marsh and reed stand and are either saturated by groundwater or slightly
Inundated by the pond The remaining solids are located at a slightly higher elevation In the
wetland in the forested /shrub area or are downstream of the beaver pond where Beaverdam
Creek is a narrow well defined channel As a result these solids are much drier with water table
elevations measured at 6 inches to 3 feet The difference in hydrology /groundwater between
these two areas affects the proposed method of removal In general there Is a greater nsk of
resuspension of solids during construction In the areas where solids are In contact or close
proximity to the surface waters of the relict beaver pond and thus greater caution and effort must
be undertaken to remove solids In these areas Moreover because the soils are saturated and
mucky in this area with lots of organic debris excavation by any method will proceed at a slower
pace than In the dner areas Additionally access will be more difficult
The removal of solids from the work area will be accomplished with mechanical excavation This
will require the contractor to use log mats to reach the wetter portions of the site Although there
are often concerns with mobilizing heavy equipment through wet sods several excavation
contractors who visited the site do not feel that the site is unsuitable for access by excavators
To Isolate the work area from surface waters and thereby help prevent the re- suspension of
solids sheet piling will be used At a meeting held with DWQ on June 30 2011 the possibility of
creating several cells of excavation was discussed wherein an individual area would be
cordoned off with sheet piling then excavated and then the sheet piling removed to another cell
of excavation After further review of this approach and discussion with several sheet pile
contractors It was determined that the process of placing and then removing sheet piling from
many small areas of excavation would possibly have greater impacts on the wetland and
significantly slow down the removal process However to maintain consistency with this
approach two cells of removal are are proposed The plan Is to Install a sheet pile wall around
the northern portion of the removal area for a total distance of approximately 300 feet excavate
this area then remove the sheet piling to the southern portion of the removal area where the
sheet pile wall will be approximately 300 feet The sheet piling will be buried to a minimum depth
of 8 feet to help separate the work area from groundwater Once an area Is Isolated pumps will
be used in the active excavation area to remove groundwater while excavation proceeds The
pumped groundwater will be sent through a sediment filter bag that will prevent re suspension of
solids by filtering out any suspended solids pumped out of the work area before discharging into
Beaverdam Creek In addition prior to installation of the sheet pile wall the relict beaver dam will
be removed to lower the water surface elevation In the pond and to facilitate installation of the
sheet piling and dewatenng of the work area The difference In water surface elevation between
the beaver pond and the downstream creek is approximately 1 ft Water depths In the pond are
Ocione 2011
AECOM Beaverdam Creek Wetland Restoration Plan g
approximately 15 feet during low flow conditions so removing the beaver dam will remove
surface water inundation from the majority of the removal area
Prior to beginning excavation work herbaceous and woody vegetation will be removed to the
extent necessary to remove the solids An attempt will be made to preserve some of the larger
more mature trees in the freshwater marsh area such as several swamp tupelos (Nyssa biflora)
to the extent that excavation can still be accomplished without their removal The contractor will
excavate the solids material until organic soils are encountered This will be accomplished both by
visual observation of excavated soils by the contractor and oversight personnel as well as by
placing grade stakes ahead of the excavation that indicate the depth of solids to be removed
The depth will be determined based on representative borings in the removal area Based on
field observations and soil bonngs the solids material has a distinctive light grey color and slick
texture that is easy to distinguish from the dark sandy organic matenal which underlies the
solids Because the nature of this project requires removal of solids without over - excavation and
with minimization of wetland impacts the excavation work will be performed by a contractor who
is qualified to perform wetlands restoration work These contractors have extensive experience in
excavating in situ soils with great precision while at the same time minimizing impacts to native
wetland soils
In addition to the main area of solids which are present in the freshwater marsh and wax
myrtle /bayberry portions of the site solids will also be removed by mechanical excavation from a
discharge channel located on the eastern edge of the site The residual solids in this channel
have a uniform depth of approximately 3 ft Following excavation of this material coir fiber
matting will be installed on the sides of the channel to prevent erosion In addition there is a
portion of the Beaverdam Creek stream channel downstream of the relict beaver dam where
some solids may need to be removed from the existing banks of the stream channel Following
excavation in this area the banks will be restored to a natural profile based on a reference
condition immediately downstream of the site The restored banks will be stabilized with coir fiber
matting and live stake plantings of native species
To help ensure that impacts are minimized qualified wetland restoration personnel will perform
on site observation of the wetland restoration during the length of the construction process This
person will conduct water quality monitoring during construction and perform any necessary
stake out prior to excavation which may include the boundary of solids removal any trees to be
preserved and installing cut depth stakes indicating depths of excavation Moreover this person
will be able to issue a stop work order to the contractor if at any time it appears that solids are
being re suspended into downstream surface waters
A preliminary plan view of the removal plan and associated details are shown in Figures 3
through 5 It should be noted that these plans are preliminary and will be updated with additional
detail prior to submittal to the Division of Land Quality for an erosion control permit
321 Dewatering of Solids and Ultimate Disposal
The ultimate disposal site of the removed solids will be the Brunswick County Construction and
Debris Landfill which is located approximately 17 miles from the project site Prior to transport
the material will be dewatered on site by creating a temporary dewatenng /stockpile area uphill of
the wetland (See approximate location on the Wetland Restoration Planview Figure 3) The
material will be spread out in this area as it is excavated and a small dozer will "work the material
Odobe 2011
AECOM Beaverdam Creek Wetland Restoration Plan
to dry it out prior to loading on trucks to haul to the landfill To prevent sediment laden water from
running off from this area a temporary diversion dike will be placed around the perimeter to trap
runoff The soils are sandy and should allow Infiltration of runoff however an outlet from the
dewatenng area may be provided Into the adjacent discharge channel if necessary
322 Construction Costs
A preliminary construction cost - estimate was created from discussion with contractors
examination of past bid tabulations on wetland restoration projects and from past experience
The preliminary cost estimate can be found in Appendix B The following assumptions were
used in these cost estimates
1) All excavated sludge material and woody debris will be transported 17 miles to the
Brunswick County Construction and Demolition Landfill
2) An estimated 5 400 cubic yards of solids will be removed
3) The county tipping fee at the landfill will be waived
4) All sludge material will be dewatered prior to transportation
5) The construction access path will be repaired and reseeded following construction
6) Removal depths will be staked by AECOM prior to construction
33 Vegetation
Revegetation efforts will emulate a natural freshwater marsh vegetation community typical to what
is found along blackwater stream systems in the Coastal Plain of North Carolina As described
above this community type is best described as the Coastal Plain Semipermanent Impoundment
(Marsh Zone) community type found in Shafale and Weekley (1990) Vegetation will be
reestablished by using a combination of seeding live stakes and bare root seedlings Temporary
seeding will be used to stabilize the site immediately following construction Depending on the
time of year this seeding will either be a cool season species mix such as winter wheatlrye or a
warm season mix such as brown top millet or Japanese millet Permanent herbaceous species
will be allowed to re- establish based on seed sources adjacent to the site and will not be planted
Rather the focus of planting efforts will be on woody species that are typical of a blackwater
stream system Depending upon final elevations and depth of water bare root seedlings of the
following species will be planted on site
Common Name Species
Button bush Cephalansus occ►dentalis
Swamp tupelo Nyssa b►flora
Cypress Taxodium d1shchum
In addition to bare root seedlings live stakes of tag alder (Alms serrulata) and black willow (Sala
n►gra) will be planted along stream bank restoration areas downstream of the relict beaver dam
and on the banks of the discharge channel as these species are well known for their ability to
stabilize streambanks through rapid growth The areas to be stabilized with live stakes will be
relatively few and thus tag alder and black willow will comprise only a small percentage of the
total planted species
Oct be 2011
AECOM Beaverdam Creek Wetland Restoration Plan
The use of material that is genetically adapted to specific site conditions enhances long term
growth and survival and avoids contaminating the gene pool of the surrounding vegetation with
non adapted ecotypes Plant material will be native species collected or propagated from material
within a similar physiographic province
34 Monitoring
Monitoring of the Beaverdam Creek WTP site will fall Into two phases construction monitoring
and post construction monitoring The purpose of the monitoring during construction is to ensure
that solids are not being resuspended Into downstream surface waters while excavation is
occurring Post construction monitoring will be conducted to ensure the success of planted
wetland vegetation and to monitor the water quality downstream and upstream of the site The
proposed monitoring is as follows
Construction Monitoring
During the excavation of solids from the wetlands downstream water quality sampling will be
conducted to ensure that solids are not being resuspended Into the surface waters Water quality
data to be collected will Include turbidity pH and conductivity Three sampling locations will be
established An upstream (background) location north of Highway 211 a downstream location
Immediately downstream of the restoration site and a second downstream location at Players
Club Drive Water quality samples will be collected on a dally basis and the results reported to
DWQ after each sampling If the results downstream indicate unacceptable levels in the water
quality parameters above the background level a stop work order will be issued to the contractor
until the problem can be remedied
Post - construction Vegetation Mon►tonng
Vegetation will be monitored on an annual basis during the growing season for three consecutive
years If the plan shows that vegetation is not successful during that three year growing season
additional monitoring years may be added Monitoring will consist of visual observation and photo
documentation Permanent photo stations will be established at 5 locations If it becomes
apparent that vegetation is not becoming established than a more rigorous sampling protocol will
be developed and implemented to evaluate vegetative cover and species composition and a
corrective action plan will be developed to address the issue
Post construction Water Quahty Monitoring
Water quality will be sampled for three consecutive years following removal of the solids
Immediately following sludge removal and site stabilization sampling will be conducted on a
weekly basis for up to a month and then tapered down to a monthly basis for one year provided
monitoring is demonstrating no deleterious water quality effects Sampling will be on a quarterly
basis for the remaining two years AECOM will establish sampling stations immediately upstream
and downstream of the site Water quality data to be collected will include temperature pH and
conductivity
35 Schedule
The following timeline is proposed for the project
Oct be 2011
AECOM Beaverdam Creek Wetland Restoration Plan 9
October November 2011 Obtain necessary permits (Sod and Erosion Control and
December-January
February 2012
February 2012
February 2013
February 2014
February 2015
36 Permits
USACE Nationwide Permit)
Complete removal of solids from wetland
Complete planting of wetland vegetation
Conduct baseline monitoring of vegetation
Conduct Year 1 monitoring of vegetation
Conduct Year 2 monitoring of vegetation
Conduct Year 3 monitoring of vegetation
It will be necessary to obtain permits for Implementation of the restoration plan The permits that
are anticipated to be required for this project are a Sedimentation and Erosion Control permit and
a USACE 404 permit Personnel with the USACE Wilmington District indicated that a Nationwide
Permit # 27 would be required for this project 401 Water Quality Certification from the NC DWQ
will be part of the Nationwide permitting process General Water Quality Certification 3689 would
apply Upon approval of this restoration plan by DWQ permits will be obtained for the project
prior to construction
Octobe 2011
AECOM Beaverdam Creek Wetland Restoration Plan 10
FIGURES
Figure 1 Site Map
Figure 2 Vegetation Cover Map
Figure 3 Wetland Restoration Plan View
Figures 4 and 5 Wetland Restoration Details
Oct be 2011
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Appendix A
Photographs
October 2011
AECOM Beaverdam Creek Wetland Restoration Plan 12
Photo 1. Freshwater marsh area at north end of site.
Photo 2. Freshwater marsh area at north end of site.
October 2011
AECOM Beaverdam Creek Wetland Restoration Plan 13
Photo 3. Willow and wax myrtle ticket on central portion of wetland.
Photo 4. Monotypic stand of common reed
October 2011
AECOM Beaverdam Creek Wetland Restoration Plan 14
Photo 5. Beaverdam Creek occurring as a single thread channel.
Photo 6. Discharge /Outfalf ditch from water treatment plant.
October 2011
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