20031239 Ver 1_Mitigation Report_20101115

03-129
FINAL REcF1VSD
ANNUAL MONITORING REPORT
IRWIN CREEK NOV 5 2010
RESTORATION SITE "64ccPR P4
MECKLENBURG COUNTY, NORTH CAROLINA Op"M
(EEP Project Number 192)
Monitoring Year 1 of 5 (20 10)
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North Carolina Department of Environment and Natural Resources
Ecosystem Enhancement Program
Raleigh, North Carolina
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FINAL
ANNUAL MONITORING REPORT
IRWIN CREEK
RESTORATION SITE
MECKLENBURG COUNTY, NORTH CAROLINA
(EEP Project Number 192)
Monitoring Year I of 5 (2010)
Submitted to:
North Carolina Department of Environment and Natural Resources
Ecosystem Enhancement Program
Raleigh, North Carolina
Prepared by:
Axiom Environmental, Inc.
20 Enterprise Street, Suite 7
Raleigh, North Carolina 27607
Design Firm:
HDR Engineering, Inc. of the Carolinas
3733 National Drive
Raleigh, North Carolina 27612
Axiom Environmental, Inc.
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f�NGGNAM
November 2010

Table of Contents
1.0 EXECUTIVE SUMMARY ................................................................................ ............................... 1
2.0 METHODOLOGY ............................................................................................ ............................... 1
2.1 Vegetation Assessment .................................................................................. ............................... 2
2.2 Wetland Assessment ...................................................................................... ............................... 2
3.0 REFERENCES ................................................................................................... ..............................3
List of Figures
Figure1. Vicinity Map ........................................................................... ............................... Appendix A
Figure 2. Current Conditions Plan View ................................................. ............................... Appendix B
Figure 3. Annual Climatic Data vs. 30 -year Historic Data ....................... ............................... Appendix D
List of Tables
Table 1. Project Components and Mitigation Credits ............................... ............................... Appendix A
Table 2. Project Activity and Reporting History ...................................... ............................... Appendix A
Table 3. Project Contacts Table .............................................................. ............................... Appendix A
Table 4. Project Baseline Information and Attributes .............................. ............................... Appendix A
Table 5. Vegetation Condition Assessment Table ................................... ............................... Appendix B
Table 6. Vegetation Plot Criteria Attainment ........................................... ............................... Appendix C
Table 7. CVS Vegetation Plot Metadata .................................................. ............................... Appendix C
Table 8. Total and Planted Stems by Plot and Species ............................. ............................... Appendix C
Table 9. Verification of Bankfull Events .......................... ............................... .......................Appendix E
Table 10. Wetland Hydrology Criteria Attainment Summary ........................... .......................Appendix E
Appendices
APPENDIX A. PROJECT VICINITY MAP AND BACKGROUND TABLES
Figure 1. Vicinity Map
Table 1. Project Components and Mitigation Credits
Table 2. Project Activity and Reporting History
Table 3. Project Contacts Table
Table 4. Project Baseline Information and Attributes
APPENDIX B. VISUAL ASSESSMENT DATA
Figure 2. Current Conditions Plan View
Table 5. Vegetation Condition Assessment Table
Vegetation Monitoring Plot Photos
APPENDIX C. VEGETATION PLOT DATA
Table 6. Vegetation Plot Criteria Attainment
Table 7. CVS Vegetation Plot Metadata
Table 8. Total and Planted Stems by Plot and Species
APPENDIX D. STREAM SURVEY DATA
Fixed - Station Photos
APPENDIX E. HYDROLOGY DATA
Table 9. Verification of Bankfull Events
Figure 3. Annual Climatic Data vs. 30 -year Historic Data
2010 (Year 1) Groundwater Gauge Graphs
Table 10. Wetland Hydrology Criteria Attainment Summary
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year I of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Table of Contents

1.0 EXECUTIVE SUMMARY
The North Carolina Ecosystem Enhancement Program ( NCEEP) has completed level II stream
enhancement and wetland creation at the Irwin Creek Restoration Site (hereafter referred to as the "Site ")
to assist in fulfilling stream and wetland mitigation goals in the area. The Site is located on the western
side of the City of Charlotte, approximately 2 miles southeast of the Charlotte Douglas International
Airport, in Mecklenburg County. The Site is located in United States Geological Survey Hydrologic Unit
03050103020020 (North Carolina Division of Water Quality [NCDWQ] Subbasin 03- 08 -34) of the
Catawba River Basin and will service USGS 8 -digit Cataloging Unit (CU) 03050103. This report
(compiled based on EEP's Procedural Guidance and Content Requirements for EEP Monitoring Reports
Version 1.3 dated 1115110) summarizes data for year 1 (2010) monitoring.
The Site is located in a NCEEP Targeted Local Watershed within the Sugar Creek watershed; this
watershed in conjunction with the Little Sugar, McMullen, and McAlpine Creek watersheds in CU
03050103 drain point and nonpoint sources of pollution from the metropolitan center of Charlottle
severely impacting aquatic health of the watershed. The waters are listed as impaired for elevated levels
of fecal coliform bacteria and turbidity; the main goal in this CU is to provide better stormwater
management ( NCEEP 2007).
Prior to construction, the Site was located within a FEMA buyout area where several homes were
demolished and removed. Surrounding land uses include commercial and residential areas with narrow
riparian corridors adjacent to streams; greater than 85 -90 percent of the contributing watershed having
been cleared and developed.
The goals and objectives of this project focus on improving local water quality, habitat, and stream
stability. The project approach was designed to provide restoration - oriented improvements to maximize
environmental benefits while working within Site constraints, technical guidelines, and availability of
funds. These goals were accomplished by the following.
1. Creating a floodplain bench including off -line wetlands to reduce the amount of sediment
entering the stream by acting as a repository for soils suspended in the water column during high
flow events, providing water storage to further allow sediment to settle out, and slow recharge of
stormwater into the groundwater subsurface network.
2. Enhancing vegetation to provide habitat /food sources, shade the stream, filter overland runoff,
and remove soil particles and other nutrients from stormwater.
3. Protecting a Site identified in a watershed that is listed as impaired for elevated levels of fecal
coliform bacteria and turbidity ( NCEEP 2007).
This project was constructed between the spring and early winter of 2009. The project consisted of
enhancement (level II) of 980 linear feet of stream by laying back stream banks, excavating an extensive
90- to 100 -foot wide floodplain bench along the entire project stream length, creating 0.5 acres of
wetlands within the floodplain bench, and planting with native forest species. Several structures were left
at the downstream end of the Site rather than removing them to avoid disturbance to the wetland area and
stream banks. In addition, it was verified by HDR Engineering that the structures will not cause an issues
with FEMA and may provide aquatic habitat and grade control. Site activities provide 653 Stream
Mitigation Units and 0.17 riparian riverine Wetland Mitigation Units. The Site will be protected by a
permanent conservation easement held by the State of North Carolina.
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina page 1

Success criteria for stream enhancement will include 1) success of riparian vegetation and 2)
documentation of two bankfull channel events. Three bankfull events were documented to occur during
the year 1 (20 10) monitoring season.
Vegetation success criteria dictate that an average density of 320 stems per acre must be surviving in the
first three monitoring years. Subsequently, 290 stems per acre must be surviving in year 4 and 260 stems
per acre in year 5. Stem counts will be based on an average of the evaluated vegetation plots. Based on
the number of stems counted, average densities were measured at 502 stems per acre surviving in year 1
(2010). The dominant species identified at the Site were planted stems of red chokeberry (Aronia
arbutifolia), river birch (Betula nigra), and green ash (Fraxinus pennsylvanica). In addition, each
individual vegetation plot met success criteria when counting planted stems alone with the exception of
plot 4, which was one stem short. When including a naturally recruited stem this plot was above success
criteria with 324 stems per acre. In general herbaceous vegetation within the Site has been slow to
establish, planted ball and burlap trees appear to be in poor health, and many of the planted trees died
over the summer as the result of dry conditions. These issues encompass the majority of the Site and
should be monitored closely in subsequent monitoring years.
Success criteria for wetland groundwater hydrology at the Site require inundation or saturation within 12
inches of the ground surface for a consecutive period of 10 percent of the growing season or greater than
23 consecutive days (the growing season in Mecklenburg County begins March 22 and ends November
11 [233 days]). Groundwater hydrology was not successful for either of the groundwater gauges for the
year 1 (2010) growing season. Gauge data presented in this document extends to September 23, 2010;
gauge data will continue to be collected through the remainder of the growing season and will be
available upon request.
Summary information and data related to the occurrence of items such as beaver or encroachment and
statistics related to performance of various project and monitoring elements can be found in tables and
figures within this report's appendices. Narrative background and supporting information formerly found
in these reports can be found in the mitigation and restoration plan documents available on EEPs website.
All raw data supporting the tables and figures in the appendices is available from EEP upon request.
2.0 METHODOLOGY
2.1 Vegetation Assessment
Five vegetation plots were established and marked after construction with four foot metal U -bar post
demarking the corners with a ten foot, three- quarter inch PVC at the origin. The plots are 10 meters
square and are located randomly within the Site. These plots were surveyed in September for the year 1
(2010) monitoring season using the CVS -EEP Protocol for Recording Vegetation, Version 4.0 (Lee et al.
2006) ( http: / /cvs.bio.unc.edu /methods.htm); results are included in Appendix C. The taxonomic standard
for vegetation used for this document was Flora of the Carolinas, Virginia, Georgia, and Surrounding
Areas (Weakley 2007).
2.2 Wetland Assessment
Two groundwater monitoring gauges were installed at the Site within off -line wetlands in June 2010 and
have been maintained and monitored throughout the remainder of the year 1 (2010) growing season.
Graphs of groundwater hydrology and precipitation are included in Appendix D.
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina page 2

3.0 REFERENCES
Lee, Michael T., R.K. Peet, S.D. Roberts, and T.R. Wentworth. 2006. CVS -EEP Protocol for Recording
Vegetation, Version 4.0. (online). Available: http : / /cvs.bio.unc.edu /methods.htm.
National Oceanic and Atmospheric Administration (NOAA). 2004. Climatography of the United States
No. 20; Monthly Station Climate Summaries, 1971 -2000. National Oceanic and Atmospheric
Administration, National Environmental Satellite, Data, and Information Service, National
Climatic Data Center, Asheville, North Carolina.
North Carolina Ecosystem Enhancement Program (NCEEP). 2007. Catawba River Basin Restoration
Priorities. Available: http: / /www.nceep. net / services /restplans /RBRPCatawba2007.pdf [June
2010]. North Carolina Department of Environment and Natural Resources, Ecosystem
Enhancement Program. Raleigh, North Carolina.
Weakley, Alan S. 2007. Flora of the Carolinas, Virginia, Georgia, and Surrounding Areas (online).
Available: http: / /www. herbarium .unc.edu /WeakleysFlora.pdf [February 1, 2008]. University of
North Carolina Herbarium, North Carolina Botanical Garden, University of North Carolina,
Chapel Hill, North Carolina.
Weather Underground. 2010. Station at Charlotte Douglas International Airport (KCLT) in Charlotte,
North Carolina. (online). Available:
http: / /www.wunderground.com/history/ airport /KCLT /2010 /4 /19 /CustomHistory.html [October
19, 2009].
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina page 3

APPENDIX A
PROJECT VICINITY MAP AND BACKGROUND TABLES
Figure 1. Vicinity Map
Table 1. Project Components and Mitigation Credits
Table 2. Project Activity and Reporting History
Table 3. Project Contacts Table
Table 4. Project Baseline Information and Attributes
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year I of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

Directions to the Site from Charlotte, North Carolina:
-> Take Interstate 77 to exit 7 (Clanton Road) �" i? • f rA �: i
> Travel northeast on Clanton Road for • v -rte -
`�.'`,y� � i � � - °. ✓,;i
approximately 0.6 mile ,
> Take the fourth left on Fieldcrest Road
> Take the second right onto Crestridge Drive
-> Take the first right onto Abeline Road
> Take the first left onto Whitehurst Road; the
Site runs parallel to Whitehurst Road between IV
Whitehurst Road and Irwin Creek'i r a ��t 7. ;
°'
-> Coordinates in center of the Site:
Latitude 35.199345 0N, Longitude 80.900418 0W
(NAD83/WGS84)
Charlotte;,
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Charlotte Douglas
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20 Enterprise Street
suite 7
Raleigh, NC 27607
(919) 215 -1693
VICINITY MAP
IRWIN CREEK STREAM RESTORATION SITE
EEP PROJECT NUMBER 192
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FIGURE
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Table 2. Project Activity and Reporting History
Irwin Creek Restoration Site /EEP Project Number 192
Elapsed Time Since Grading Complete: 1.5 years
Elapsed Time Since Planting Complete:l year
Number of Reporting Years: 1
Activity or Deliverable
Data Collection
Complete
Completion
or Delivery
Restoration Plan
--
October 2003
Site Construction and 1st Planting
--
Spring 2009
2nd Planting
--
Late fall/early winter 2009
As -built Analysis Report
--
March 2010
As -built Record Drawings
--
March 2010
Baseline Monitoring Document
June 2010
October 2010
Year 1 (20 10) Monitoring Document
November 2010
October 2010
Table 3. Project Contacts Table
Irwin Creek Restoration Site /EEP Project Number 192
Designer
HDR Engineering of the Carolinas, Inc.
3733 National Drive
Raleigh, NC 27612
919 - 785 -1118
Construction and
Blythe Development Company
Seeding and Matting Contractor
1415 E. Westinghouse
Charlotte, NC 28273
Planting Contractor
North State Environmental, Inc.
2889 Lowery Street, Suite B
Winston Salem, NC 27101
336 - 725 -2010
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

Table 4. Project Baseline Information and Attributes
Irwin Creek Restoration Site /EEP Project Number 192
Project Information
Project Name
Irwin Creek Restoration Site
Project County
Mecklenburg County, North Carolina
Project Area
5.7 acres
Project Coordinates
35.199345 °N, 80.900418 °W
Project Watershed Summary Information
Physiographic Region
Piedmont
Ecoregion
Southern Outer Piedmont
Project River Basin
Catawba
USGS 8 -digit HUC
03050103
USGS 14 -digit HUC
03050103020020
NCDWQ Subbasin
03 -08 -34
Project Drainage Area
20,000 acres
Project Drainage Area Impervious Surface
>30%
CGIS Land Use Classification
Reach Summary Information
Enhanced length
980 linear feet
Drainage Area
31 square miles
NCDWQ Index Number
11 -137 -1
NCDWQ Classification
C
Dominant Soil Series
Monacan
Drainage Class
Moderately well- somewhat poorly
Soil Hydric Status
Contains 5% hydric Wehadkee soils
Wetland Summa Information
Size of Wetland
0.5 acres
Wetland Type
Riparian riverine
Mapped Soil Series
Monacan
Drainage Class
Moderately well- somewhat poorly
Soil Hydric Status
Contains 5% hydric Wehadkee soils
Source of Hydrology
Stormwater, stream overbank
Regulatory Considerations
Regulation
Applicable
Waters of the U.S. — Sections 404 and 401
No
Endangered Species Act
No
Historic Preservation Act
No
CZMA/CAMA
No
FEMA Floodplain Compliance
No
Essential Fisheries Habitat
No
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (20 10)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

APPENDIX B
VISUAL ASSESSMENT DATA
Figure 2. Current Conditions Plan View
Table 5. Vegetation Condition Assessment Table
Vegetation Monitoring Plot Photos
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

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Vegetation Monitoring Photographs
Taken September 2010
Irwin Creek (final)
EEP Project Number 192
Mecklenburg County, North Carolina
Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
November 2010
Appendices

VEGETATION PLOT DATA
Table 6. Vegetation Plot Criteria Attainment
Table 7. CVS Vegetation Plot Metadata
Table 8. Total and Planted Stems by Plot and Species
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

Table 6. Vegetation Plot Criteria Attainment
Irwin Creek Restoration Site (EEP Proiect Number 192)
Vegetation Plot ID
Vegetation Survival Threshold Met?
Tract Mean
1
Yes
80%
2
Yes
3
Yes
4
No*
5
Yes
*Based on planted stems alone, this plot is one stem shy of meeting success criteria; however, with the additional natural recruit
of red maple (Acer rubrum) this plot contains 324 stems per acre.
Irwin Creek (final)
EEP Project Number 192
Mecklenburg County, North Carolina
Axiom Environmental, Inc. Monitoring Year 1 of 5 (20 10)
November 2010
Appendices

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Irwin Creek (final)
EEP Project Number 192
Mecklenburg County, North Carolina
APPENDIX D
Fixed - Station Photos
Axiom Environmental, Inc. Monitoring Year 1 of 5 (20 10)
November 2010
Appendices

Irwin Creek
Taken July 2010
Photo Point 1: Downstream structure left in
place to avoid disturbance to wetlands and
stream banks in addition to provide potential
aquatic habitat and channel grade control
.. r
s
Photo Point 4: 6 >'.
Topo break looking from the
excavated bench up to the levee
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year I of 5 (20 10)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

APPENDIX E
HYDROLOGY DATA
Table 9. Verification of Bankfull Events
Figure 3. Annual Climatic Data vs. 30 -year Historic Data
2010 (Year 1) Groundwater Gauge Graphs
Table 10. Wetland Hydrology Criteria Attainment
Irwin Creek (final) Axiom Environmental, Ina Monitoring Year 1 of 5 (20 10)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

Table 9. Verification of Bankfull Events
Irwin Creek Restoration Site (EEP Proiect Number 1921
Date of Data
Date of Occurrence
Method
Photo (if
Collection
available)
Total of 2.14 inches* of rain reported to fall over 2 days
September 23, 2010
July 12, 2010
(July 11 -12, 20 10) as well as a brief spike in groundwater at
--
groundwater gauge 2
Total of 1.1 inches* of rain reported to fall over 2 days
(August 18 -19, 2010) after a total of 4.43 inches* of rain the
September 23, 2010
August 19, 2010
preceding 4 weeks as well as brief spike in groundwater at
groundwater gauges 1 and 2
October 18, 2010
September 29, 2010
Total of 4.04 inches* of rain reported to fall over 6 days
-
(September 25-30,2010)
* Reported at KCLT Weather Station at the Charlotte Airport (Weatherunderground 2010).
Figure 3. Annual Climatic Data vs. 30 -year Historic Data
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*Charlotte Douglas International Airport 30 -year historic data (NOAA 2004)
* *Charlotte Douglas International Airport rainfall data (Weatherunderground 2010)
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year I of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices

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Table 10. Wetland Hydrology Criteria Attainment Summary
Irwin Creek Restoration Site (EEP Project Number 192)
* Data is presented from June 10, 2010 through September 23, 2010; gauges will continued to be
downloaded through the remainder of the growing season and will be available upon request.
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices
Success Criteria Achieved/Max Consecutive Days During Growing Season
Gauge
(Percentage)
Year 1 (2010)*
Year 2 (2011)
Year 3 (2012)
Year 4 (2013)
Year 5 (2014)
1
No/ 1 day
(0.004%)
2
No /3 days
(0.01%)
* Data is presented from June 10, 2010 through September 23, 2010; gauges will continued to be
downloaded through the remainder of the growing season and will be available upon request.
Irwin Creek (final) Axiom Environmental, Inc. Monitoring Year 1 of 5 (2010)
EEP Project Number 192 November 2010
Mecklenburg County, North Carolina Appendices