HomeMy WebLinkAbout20011032 Ver 1_Monitoring Report_20101216North Carolina State University is a land- Office of Finance and Business
Grant university and a constituent institution Environmental Health and
Of The University of North Carolina Public Safety Division
An Equal Opportunity/Affirmative Action Employer Environmental Health & Safety Center
http://www2.ncsu.edu/ehs/ Campus Box 8007
Raleigh, North Carolina 27695-8007
Assoc. Vice Chancellor 919.515.4238
Environmental Affairs 919.515.6859
Industrial Hygiene 919.515.6860
Health and Safety 919.515.6858
Radiation Safety 919.515.2894
Business Continuity 919.515.5201
(Fax) 919.515.6307
December 21, 2010
Eric Kulz
NC DENR - Division of Water Quality
401 Wetlands Certification Unit
1650 Mail Service Center
Raleigh, North Carol ina27699-1650
C RE%D
w"OF01SQUALITY
RE: Stormwater Wetland, Stream and Buffer Restoration at the College of Veterinary
Medicine and Lake Wheeler Field Lab, DWQ Project # 01-1032
Eric:
Please find enclosed one copy of the 2010 Monitoring Report for the above-referenced
project. A copy is also being provided to Natalie Landry.
If you require additional information or have any questions, please do not hesitate to
contact me at 515-6859.
Thank you,
G
Manager, Environmental Affairs
Enclosure
2010 Monitoring Report
Additional Monitoring
Stormwater Wetland at the College of
Veterinary Medicine
Prepared by: Biological & Agricultural Engineering
North Carolina State University
Campus Box 7625
Raleigh, NC 27695
November 2010
Table of Contents
Table of Contents ........................................................................................................................................ ii
Tables and Figures ......................................................................................................................................ii
1.0 EXECUTIVE SUMMARY/ABSTRACT .........................................................................................1
2.0 BACKGROUND INFORMATION .................................................................................................1
2.1 Project Description ........................................................................................................................ l
2.2 Goals and Objectives ..........................................................................................................................1
2.3 Design Summary ................................................................................................................................. l
2.3.1 CVM Site Description and Landuse ............................................................................................1
2.3.3 Proposed CVM Stormwater Wetland .......................................................................................... 2
3.0 Upper Wetland Repair Summary ...................................................................................................... 5
3.1 Vegetation ..................................................................................................................................... 5
4.0 YEAR 2010 RESULTS AND DISCUSSION .................................................................................. 6
3.1.1 Results and Discussion .......................................................................................................... 6
Tables and Figures
Table 1. Background Information .............................................................................................................3
Figure 1. Project Location Map ................................................................................................................4
Appendix A. Site Photo Log ..................................................................................................................... 7
Appendix B. Wetland Repair Plans ........................................................................................................11
11
1.0 EXECUTIVE SUMMARY/ABSTRACT
This monitoring effort is a sub-project of the larger Stream, Buffer, and Wetland Restoration
efforts at NCSU College of Veterinary Medicine and Lake Wheeler.
Construction activities at CVM that began in 2007 resulted in a large sediment flux into the
stormwater wetland area. The forebay was completely filled and the upper wetland had been
impacted. The forebay was cleaned out once in February of 2009. The forebay was cleaned out
again in 2010, and the entire upper wetland was re-built and re-graded. The wetland was re-
planted in the spring of 2010, and plants were maintained and watered over the summer.
This report details and documents the wetland repair activities, and the development of the
vegetative community during the first growing season. An additional report is planned annually
until construction activity has been completed and the watershed draining toward the wetland
stabilized. It is expected that adjacent construction activity will be completed in the summer of
2011.
2.0 BACKGROUND INFORMATION
The background information for this report is referenced from previous monitoring reports
conducted by ARCADIS and NCSU.
2.1 Project Description
ARCADIS was retained by North Carolina State University (NCSU) to prepare
design and construction documents for the mitigation project. The CVM
project includes a 0.7-acre stormwater wetland and approximately 53,000
square feet of buffer surrounding the stream restoration site and 58,000 square
feet of pond buffer restoration at an existing pond immediately downstream of
the stream restoration site.
2.2 Goals and Objectives
The purpose of the stream restoration, the stormwater wetland, and the buffer
restoration is for NCSU to gain mitigation credit for stream impacts caused by
previous NCSU development projects.
The goal of the project is to improve water quality by reducing sediment from
eroding stream banks and by reducing nutrient input through the establishment
of a permanent riparian buffers and the stormwater wetland. The buffers will
prevent grazing and direct access by cattle to the stream and will improve the
stream habitat.
2.3 Design Summary
2.3.1 CVM Site Description and Landuse
The CVM project area is along an unnamed tributary to House Creek, an
intermittent stream in Wake County, North Carolina. The project is
approximately 2,000 feet west of the Hillsborough Street (NC Highway 54) and
Interstate 440 intersection in Wake County. Land use surrounding the project
area includes residential, commercial, recreational, and industrial. The NCSU
property is bounded to the north by the Wade Avenue extension, with the North
Carolina Art Museum beyond. Blue Ridge Road is immediately to the west of
the NCSU property, with the North Carolina State Fairgrounds beyond.
Hillsborough Street borders the property to the south with the North Carolina
State Arboretum and commercial properties beyond. East of the veterinary
school property is the NCSU faculty club facility, with Interstate 440 beyond.
The NCSU CVM Campus is approximately 190 acres, with the project area
near the south-central portion of the property. The headwaters of the project
stream are almost entirely contained within the research facility. The entire
project area is within the Neuse River drainage basin. The upstream limit of
the project is at the outfall of an existing 42-inch concrete pipe draining the
existing CVM parking lots and associated grounds. The downstream project
limit is at the upper end of an existing pond in the center of the campus.
2.3.3 Proposed CVM Stormwater Wetland
The stormwater wetland will be located at the upstream limit of the stream
restoration project and was designed to treat stormwater runoff from the future
developed condition of the watershed. The design was based on the North
Carolina Department of Environment and Natural Resources (NCDENR)
Stormwater Best Management Practices, the NCSU Cooperative Extension
document "Designing Stormwater Wetlands for Small Watersheds, " and the
NCSU CVM Stormwater Master Plan.
The wetland will begin immediately downstream of the existing 42-inch pipe
and will extend along the stream valley approximately 600 feet. The wetland
volume and surface area were designed to treat the runoff produced from 1 inch
of rainfall over the contributing watershed, assuming fully developed
conditions. Based on the NCSU CVM Stormwater Master Plan, the future
watershed will consist of 38.1 acres with 18.9 acres impervious area.
The wetland will include a normal pool similar to a wet detention pond with a
forebay and areas of shallow water, deep pools, shallow land (submerged
during storms), and upland (not submerged during storms). A riser-barrel
principal spillway was designed to slowly release the outflow allowing
treatment of the runoff from the first inch of rainfall. Runoff volumes
exceeding that from the first inch of rainfall will flow through an emergency
spillway and will bypass the treatment area. Both spillways from the wetland
will discharge into the stream. The emergency spillways were designed to
accommodate the 100-year storm. Flood routing calculations were performed
for the 2-, 10-, 50-, and 100-year storm events using the "chainsaw" method, as
described in "Elements of Urban Stormwater Design, " (Malcom 1989).
The stormwater wetland design included a planting plan that consists of native
species selected with consideration of existing soils, topography, drainage, and
the design guidance documents mentioned previously. The planting plan
includes a variety of species locally adapted to encourage a diverse natural
ecosystem. Included are fringed sedge, waterweed, soft rush, pickerelweed,
arrowhead, soft-stem bulrush, and bushy bluestem.
2
Table 1. Background Information
Project Name Stormwater Wetland Creation and Stream and Buffer
Restoration of Unnamed Tributary to House Creek at the NCSU
College of Veterinary Medicine
Stream Buffer Restorations at Lake Wheeler Road Field
Laboratory
Designer's Name Arcadis, Inc
801 Corporate Center Drive
Raleigh, NC 27606
Project County Wake County
Directions to Project
From 1-440 in Raleigh, exit onto Hillsboro Street. Follow toward
Site NC Fairgrounds (away from downtown). Vet School will be on
the right. Creek begins downstream of stormwater wetlands in
field next to Hillsboro Street.
Drainage Area 0.059 sq. mi. (upper end)
0.097 s q. mi. (lower end
USGS Hydro Unit 03020201
NCDWQ Subbasin 12-33-13 (House Creek)
27-43-5 (Swift Creek
Project Length 810 linear feet stream restoration
Restoration Approach 810 linear feet of dimension, pattern, and profile
0.7 acre stormwater wetland creation
111,000 square feet of buffer restoration at College of
Veterinary Medicine Site
71,000 square feet of buffer restoration at
Lake Wheeler Field Road Site
Date of Completion Summer 2004
Monitoring Dates October 2004 (as-built survey)
December 2005 (MY-01)
April 2007 (MY-02)
January 2008 (MY-03)
December 2008 (MY-04)
February 2010 (MY-05)
November 2010 (Additional
Wetland Monitoring)
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WHEELER FIELD LAB
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FIGURF 1. SITE I OCATION MAP R?oLoWi. l,bc ?-p,,,, %. FNG7625
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3.0 Upper Wetland Repair Summary
NCSU Water Quality Group was hired to manage repair activities for the upper wetland. They
worked with NCSU Construction Management and the NCSU Environmental Health and Safety
Center to develop a plan to assess the extent of damage, prepare a repair plan, and manage
construction activities during repairs.
Existing Condition Survey
NCSU Water Quality Group staff conducted a topographic survey in the summer of 2009 to
determine the extent of sedimentation in the upper wetland. The survey data was be used in
combination with soil sampling to estimate the amount of sediment deposited, and to determine
the earthwork required to restore design conditions. The survey was later used as a base map for
construction schematics and developing the repair plan.
Wetland Repair/Redesign
A repair plan was developed for the wetland using the latest recommendations and design
specifications. A series of schematics were developed to guide grading, soil preparation, and
planting activities. The repair required 1200 cubic yards of soil removal to restore proper function
of the forebay and wetland, the installation of new topsoil, and minor modification of the outlet
structure.
The wetland redesign was approved through internal NCSU review and submitted to NCDWQ
for approval. This plan was approved in the winter of 2009 and bidding and construction was
scheduled for the spring of 2010. The approved plans are provided in an Appendix of this report.
Construction
Construction and repair activities began in late April 2010. Construction was completed in a span
of approximately 2 weeks and the site was planted in early May.
3.1 Vegetation
The repaired site was planted with approximately 3,000 wetland plugs. Plants were set at a 2ft
center spacing to maximize coverage in the first year. All disturbed areas outside the wetland
interior were seeded with grass and covered with straw mulch.
Wetland Plant Species List
Shallow Water Areas Shallow Land Areas
Pontedaria Cordata Juncus effuses
Petlandria vir inica Scir us validus
S ar anium americanum Carex critina
Saurus cernus Panicum vir alum
Sa ittaria lati olia
A total of 100 wetland shrubs were planted on slopes and areas above the normal pool level.
Wetland shrubs
Hibiscus moscheutos
Rosa alustris
Lobelia cardinalis
Vernonia noveboracensis
4.0 YEAR 2010 RESULTS AND DISCUSSION
3.1.1 Results and Discussion
Stormwater Wetland
The CVM wetlands were visited many times over the summer and several times in the fall of
2010.
Vegetation.
Extended periods of no rainfall occurred twice over the summer of 2010. During these periods,
water level in the wetland became dangerously low for plant survival. A temporary sprinkler
system was set up to irrigate the plants and spread water from the deep pools. Irrigation efforts
appear to have kept mortality to a minimum. However, dry conditions led to the volunteer growth
of several grass and the spread of polygonum (smartweed). Polygonum is a common volunteer in
shallow wetlands and can spread aggressively. In addition, to extended dry periods, several large
rainstorms (> I") created flooded conditions that submerged young plants. The outlet structure
was actively managed during these times to prevent extended submergence.
By the end of the first growing season, the wetland is very well vegetated. The wetland interior
has nearly reached 100% coverage. The dominant plant species in the wetland interior are
Pondetaria cordata (pickerelweed), petlandria virginica (arrowhead), and polygonum. The
wetland sideslopes have shown the survival of most species, however growth and coverage are
less prolific. Wetland shrubs appear to have survived and are healthy.
It is recommended that wetland vegetation continued to be monitored over the next growing
season. Some additional planting around the wetland borders may improve the growth and
coverage of shallow land species. Polygonum should be monitored to ensure it does not
outcompete more desirable vegetation.
Hydrology.
The alternating droughty and flooded conditions of this summer made maintaining the design
water levels a challenge. It appears that the wetland system is functioning properly and water
levels are now being maintained at the proper level. Maintenance of the wetland inlet structures
and regular cleanout of debris is critical to continued function. Both cells appear to be
maintaining water levels appropriate for wetland vegetation. It is expected that site hydrologic
conditions have stabilized, and that conditions will improve as construction activity nears
completion. However, the wetland water level should be carefully managed in the spring of 2011
to ensure proper conditions during the beginning of the growing season.
6
NCSU College of Veterinary Medicine
Wetland Repair Photo Log
2010
H. Sediment excavation
N -'-x
P-). SUHacc with topsoil added
P3. Loading trucks for hauling
N. Forebay and inlet structures cleanout
P6. Interior deep pools added
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P 1 't. Irrigation/sprinkter setup 1112. Initial growth
P7. Inlet apron repair
P8. Planting wetland interior
P9. Planting around deep pools
P10. Wetland shrubs
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P15. Hibiscus
P16. First rainfall completely filled the wetland.
P17. Upper Wetland - August 2010
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P 18. Upper Wetland - August 2010
P 18. Lower Wetland - August 2010
Appendix B. Wetland Repair Plans
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