HomeMy WebLinkAbout20090734 Ver 1_Year 1 Monitoring Report_20101124Stantec Consulting Services Inc.
801 Jones Franklin Road Suite 300
Raleigh NC 27606 U U
Tel: (919) 851-6866
Fax: (919) 851-7024
Stantec
November 22, 2010
North Carolina Division of Water Quality
1650 Mail Service Center
Raleigh, NC 27699
Dear Mr. Eric Kulz:
all f7
Nov 2 f 2010
WETW Ds AND sTOORR I'1?h', TER BRANCH
As requested the Buckhorn Generating Facility Removal and Stream Restoration Monitoring Year 1 report is
being submitted for review to Monte Matthews (USACE), Eric Kulz (NCDWQ), and Jeremy Thigpen (Progress
Energy).
From 401/404 permit:
As per direction from Monte Matthews (USA CE) and Eric Kulz (NCDWQ) on March 10, 2009, the project is to
be visually monitored for 5 years to prove stability. Monitoring consists of visual inspections of channel and
structure stability, photo points and a qualitative assessment of the survival of planted vegetation. All
monitoring activities will be completed for Buckhorn Creek and the two redesigned tributaries. A brief report
will be prepared and submitted to USA CE and NCDWQ annually for 5 years following completion of the
project.
Should you have any questions about the report, please do not hesitate to call.
Sincerely,
STANTEC CONSULTING SERVICES INC.
,I 1) ---,
Amber Coleman
Scientist, Environmental
Tel: (919) 865-7399
Fax: (919) 851-7024
amber.coleman(&stantec.com
Attachment: Buckhorn Generating Facility Removal and Stream Restoration Monitoring (YR1) Report
Cc: Monte Matthews, USACE
Jeremy Thigpen, Progress Energy
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Buckhorn Generating Facility Removal
and Stream Restoration 11N@EeOwL9@
h?o v ?. r 20,40
Monitoring (YRI) -F?
Chatham County, North Carolina
November 19, 2010
FINAL
Submitted By:
Stantec Consulting Services Inc.
801 Jones Franklin Rd, Suite 300
Raleigh, NC 27606
StafftC
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Table of Contents
1 Introduction and Background ...................................
2 Visual Assessment ..................................................
2.1 Stream ..............................................................
2.2 Vegetation ........................................................
3 References ..............................................................
Appendix A. Photos ........................................................
Appendix B. Figures ........................................................
Figure 1. Vicinity .............................................................
Figure 2. Monitoring Plan View & Current Condition ......
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
October 2010
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1 Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
1
October 2010
Page ii
1 INTRODUCTION AND BACKGROUND
Progress Energy Carolinas (PEC) hired Stantec Consulting Services, Inc. (Stantec) to provide
engineering work related to the demolition of the Buckhorn Generating Facility and subsequent
stream restoration of Buckhorn Creek.
As per direction from Monte Matthews (USACE) and Eric Kulz (NCDWQ) on March 10, 2009,
the project is to be visually monitored for 5 years to prove stability. Monitoring consists of visual
inspections of channel and structure stability, photo points and a qualitative assessment of the
survival of planted vegetation. All monitoring activities will be completed for Buckhorn Creek and
the two redesigned tributaries. A brief report will be prepared and submitted to USACE and
' NCDWQ annually for 5 years following completion of the project.
2 VISUAL ASSESSMENT
Stantec staff visited the site on October 15, 2010 to perform a visual assessment of post-
construction conditions at the end of the first growing season.
' 2.1 Stream
Approximately 1575 linear feet (LF) along Buckhorn Creek (Reach 1) and two unnamed
' tributaries (Reach 2 and Reach 3) was restored in conjunction with the of the removal of the
Buckhorn Power Generating Facility. Restoration techniques included channel relocation,
placement of in-stream structures, and floodplain grading.
' The approximately 900 LF of restoration along Buckhorn Creek is generally stable. Riffles have
become increasingly coarse, but are maintaining their constructed bankfull dimension. The
interberm features constructed in the riffle sections are showing signs of minor erosion in some
areas and minor deposition in other areas. This is expected as the channel undergoes slight
adjustments post construction. Pools have maintained their dimension and depth. The three
brush layerings utilized in the outside meander bends are protecting the banks as intended. The
' right bank from Sta. 4+54 to Sta. 5+20 is exhibiting excess erosion (Appendix A2 Photo 1). The
erosion is caused from a bedrock outcrop near the bank. This area is scheduled to be repaired
in the near future. The repair will consist of an additional rock vane constructed to turn water
away from the bank.
The approximately 200 LF of restoration along Reach 2 is stable. The banks exhibit no signs of
erosion and the bed shows no downcutting or sedimentation. All drop structures are holding
' grade as intended.
The approximately 475 LF of restoration along Reach 3 is stable. The banks exhibit no signs of
erosion and the bed shows no downcutting or sedimentation. All drop structures are holding
' grade as intended.
2.2 Vegetation
' After final grading was complete in December 2009, the riparian zone was planted with native
woody species along the entire project. Bareroot trees were planted on the floodplain and
adjacent slopes while livestake shrubs were planted along the streambanks. Overall, the
' planted vegetation onsite is doing well with no major issues. Desirable volunteers including
sycamore and eastern cottonwood are prevalent throughout the site.
1 Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Page 1
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Minor issues include one bare area located along the right bank of Reach 2. This area can be
seen at Photo Station 2 in Appendix Al is due to a bedrock outcrop. This bedrock area is
natural and will not be planted. The riparian buffer is greater than 100 feet in this area and this
bare area will not affect water quality.
' A few invasive plant species are also present onsite. The most prevalent includes Japanese
stiltgrass (Microstegium vimineum). The stiltgrass was present onsite before restoration, is
currently present in the forest outside the disturbed areas and is also present in the watershed
upstream. Currently it is located on the western half of the site. Japanese stiltgrass is difficult to
eradicate since the seeds are transported by water and it is already prolific in the surrounding
area. Due to the low-growing herbaceous nature of the plant it is not likely to negatively affect
the woody plant community.
The invasive Asiatic dayflower (Murdannia keisak) is present along the banks of Reach 2, the
downstream end of Reach 3 and the upstream end of Reach 1 (Buckhorn Creek). The native,
yet invasive, cattail (Typha latifolia) is also present in the lower half of Reach 3. These plants
can form dense stands within the stream potentially affecting function. These species will not
affect the woody plant community but will be monitored to ensure that stream stability and
' function are not compromised.
'J
Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
October 2010
Chatham County, NC Page 2
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3 REFERENCES
USACE 2003. US Army Corps of Engineers, Wilmington District; NC Division of Water Quality;
US Environmental Protection Agency, Region IV; Natural Resource Conservation Service; and
NC Wildlife Resources Commission. Stream Mitigation Guidelines. Raleigh, NC.
Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
October 2010
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
October 2010
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APPENDIX A. PHOTOS
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' Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
October 2010
Chatham County, NC Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
October 2010
Appendix
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Al. PHOTO STATIONS
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
October 2010
Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Chatham County, NC
October 2010
Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
October 2010
Appendix
Photo Point 9 - Downstream
A2. ADDITIONAL PHOTOS
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
Photo 1 - Bank Erosion Right Bank (Approximately STN 5+00)
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
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Japanese Stiltgrass on Floodplain and Slopes
October 2010
Appendix
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' Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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APPENDIX B. FIGURES
Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Figure 1. Vicinity Map
Project
Area
Buckhorn Generating -
Facility Removal
?- Railroad
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/V US Highways
/V NC Highways
Roads
Streams
Lake/pond
City Limits 0 2,500 5,000 10,000 15,000 Fe t
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Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1 October 2010
Chatham County, NC Appendix
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Figure 2. Monitoring Plan View & Current Condition
Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
Chatham County, NC
October 2010
Appendix
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' Buckhorn Generating Facility Removal & Stream Restoration - Monitoring YR1
October 2010
Chatham County, NC Appendix
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