20061416 Ver 1_Repair and Stabilization Plan_20090928

Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
September 25, 2009
S&EC Project No. 8126.P1
Ms. Lauren Witherspoon
NCDENR-DWQ
Raleigh Regional Office
3800 Barrett Drive
Raleigh, NC 27609
www.SandEC.com
O L.P - I I+ I U
C?cL tm
Mr. Monte Matthews
US Army Corps of Engineers
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Ste. 105
Wake Forest, NC 27587
Reference: Booth MountainlWestfall
Repair & Stabilization Plan
N OV-2008-PC-0833
DWQ Project # 06-1416
Chatham County, NC
Dear Mrs. Witherspoon and Mr. Matthews:
SEP 2 8 2009
WETLANDS AND ST WATERORMWATFA BRAhV{
On behalf of Branch Banking & Trust (BB&T), on April 17, 2009 Soil & Environmental
Consultants, PA (S&EC) submitted a response to the NC Division of Water Quality's (DWQ)
December 9, 2008 Notice of Continuing Violation, Notice of Intent to Enforce and Notice of Intent
to File for Injunctive Relief letter. Within this response was a Repair & Stabilization Plan designed
by S&EC for Crossings 1, 2 & 3. Since that time we understand that the DWQ has revisited the
project site and has concluded that there are areas within Crossings 1 & 2 that have stabilized
and re-vegetated and has recommended that these areas remain undisturbed. We also
understand that the USACE has agreed with this recommendation. Therefore S&EC is providing
a revised Repair & Stabilization Plan; the Plan is attached and directly reflects agency comments.
All other responses within the April 17, 2009 letter have not changed.
We anticipate that this addresses all of the NCDWQ and USACE's concerns. If you have any
further questions or any additional explanation is needed, plgase don't hesitate to call.
Sincerely,
SOIL & ENVIRONMENTAL CONSULTANTS, PA
a,??oz_ E6_aJ 0_ ?z__
Debbie Edwards
Environmental Specialist
Attachments:
1) S&EC Repair & Stabilization Plan-April 3, 2009 (Revised September, 25, 2009)
Cc: Mr. John Rybak-BB&T, SVP Environmental Risk Manager
Mr. Mike Zaccardo - CE Group, Inc.
Mr. John Hennessey- NCDWQ NPS Assistance and Compliance Oversight
Mrs. Cyndi Karoly- 401 Oversight/Express Review Permitting Unit
BOOTH MOUNTAIN
REPAIR &
STABILIZATION PLAN
CHATHAM COUNTY, NORTH CAROLINA
S&EC Project No. 8126.1) 1
April 3, 2009
REVISED September 25, 2009

Patrick K. Smifh, P.]
N.C. License No. 25
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
Site Description
REVISED September 25, 2009
Project No. 8126.131
The project site consists of 314 acres (+/-), approximately six miles south of Chapel Hill
in Chatham County, NC. The site is located south of Lystra Road (SR 1721), 2.5 miles
east of the intersection of Lystra Road and Highway 15-501. The impacted streams
include two unnamed tributaries to Herndon Creek, as well as a portion of Herndon
Creek itself, a tributary to Jordan Lake (Class WS-IV) within the Cape Fear River Basin
(Catalog Unit 03030002). In accordance with NOV-2008-PC0833, we have identified
the impacted areas as Crossing 1, Crossing 2 and Crossing 3 in the attached Repair &
Stabilization Plan.
Onsite Observations
On May 2, 2008, Ms. Debbie Edwards, Ms. Rebecca Peterson and Mr. David Gainey of
S&EC and Ms. Lauren Witherspoon and Mr. John Hennessey of DWQ visited the
referenced site to observe reported sediment impacts to the stream channel and wetlands
and a potentially perched culvert in the vicinity of Crossing 1. During the site visit, the
impacted stream reach and adjacent areas were traversed, and the extent and severity of
the reported sediment impacts were observed.
During this site visit, site observations indicated that an area of channel approximately 30
feet in length on the upstream end of Crossing 1 and the adjacent wetlands on either side
of the stream were impacted with sediment in depths ranging from a skim layer (typically
less than 2-inches in thickness) up to 18 inches based on field measurements with a hand
auger. A skim layer of less than 2 inches of sediment was also found in uplands on the
downstream side of the road crossing. The material deposited consists of fine gravel,
sands and fine clay materials along the subject reach. This combination of materials is
easily eroded and routinely observed to migrate, particularly from sites which are not yet
stabilized. Our site observations also concluded that the wetland and stream channel
upstream of the culvert were excavated during construction of the crossing, and were not
returned to their natural grade resulting in the perched culvert. Since the May 2, 2008
site visit, S&EC provided recommendations for the cleanup and repair activities
necessary to address these issues and our recommendations were approved by DWQ.
The proposed cleanup and repair activities were however not executed.
On February 25 and March 5, 2009 we revisited the site to evaluate current site
conditions and collect supplemental site data. We have determined that at Crossing 1 a
significant portion of the area upstream of the crossing has stabilized and re-vegetated
since the original site visit; however, the area downstream of Crossing 1 appears to be
generally in the same condition as previously reported. See Photos 1 through 4.
At Crossing 2, the sewer easement appears to have been constructed greater than the
approved width of 50 feet. The wetlands within the cleared area were determined to be
unstable and show evidence of excavation and spoil displacement. Additionally, the
banks of Herndon Creek appear somewhat unstable for approximately 45 LF of stream
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Booth Mountain Repair & Stabilization Plan REVISED September 25, 2009
Soil & Environmental Consultants, PA Project No. 8126.1) 1
channel and as such this area will require local repair and stabilization. And although the
stream appears to have been trafficked by heavy vehicles, no sediment was observed in
the stream channel. See Photos 5 and 6. Since the submittal of our original Repair &
Stabilization Plan on April 17, 2009 further stabilization of the stream and wetland area
at Crossing 2 has occurred. Based on our most recent discussions with both USACE and
DWQ it was agreed that the originally proposed grading operations in this area are no
longer warranted. Accordingly only planting operations as described on the attached
Construction Drawings will occur.
At Crossing 3, it was determined that approximately 70 LF of stream channel on the
upstream end of the culvert is unstable and has formed an approximate 18-inch head cut
which is actively migrating upstream. At the downstream end of the culvert, the stream
appears to be flowing beneath the existing riprap. Based on site conditions it appears that
a portion of the originally installed riprap apron immediately downstream of the culvert
was subsequently removed leaving the culvert perched. Limited in-channel sediment was
observed downstream of the culvert at the time of our visit. See Photos 7 and 8.
Delineation of Sediment Impacts
Sediment impacts were only delineated in the vicinity of Crossing 1. Based on
discussions with DWQ personnel during the May 2, 2008 site visit, S&EC delineated the
boundaries of the observed sediment deposition within the impacted stream and wetlands.
These areas were flagged with sequentially numbered S&EC logo pin flags and GPS
located. As no sediment impacts were observed in the vicinity of Crossings 2 and 3
during our most recent site visits, no delineations were performed nor cleanup
recommendations made.
A total of 0.000961 acres (41.84 square feet) of stream, of 0.0196 acres (855.27 square
feet) of wetland, and of 0.00292 acres (127.21 square feet) of upland appear to have been
impacted by the deposition of sediment at Crossing 1. Sediment deposition observed
onsite varies considerably. For ease of evaluations we have divided observed sediment
impacts into two categories:
Category 1 - Sediment deposition in excess of approximately two (2) inches in
thickness which will require removal and proper disposal.
Category 2 - Sediment deposition less than approximately two (2) inches in
thickness which will remain in place.
NOTE: Based on experience with similar sediment deposition and
subsequent cleanup operations, it is our opinion that deposition layers less
than approximately two (2) inches in thickness should remain in place.
Cleanup of thin layers can result in damage to the underlying soils which
will exceed the temporary nature of localized thin layered deposition.
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Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.D1
These originally delineated impacted areas are identified on the attached Construction
Drawings. Since our original sediment delineation in May of 2008, the identified
sediment has not been removed, and these areas have largely stabilized and re-vegetated
(See Photos 3 and 4). As a result, we have modified our proposed cleanup operations
from the original submission on May 19, 2008. Our recommendations are described in
Proposed Sediment Cleanup Operations below.
Proposed Sediment Cleanup Operations
This Repair & Stabilization Plan (sediment clean-up recommendations) was prepared in
part for the purpose of providing a systematic approach to remove and/or stabilize in
place sediment impacts onsite. Some modifications to our originally proposed and
approved plan have been made based on observed changes to site conditions from our
most recent site visits.
Based on our site observations and experience with similar projects, S&EC proposes the
following steps be performed to remove the existing sediment impacts onsite and reduce
the potential for future sediment impacts:
Step 1 Repair as necessary and augment existing site Erosion and Sediment
(E&S) control measures including silt fence, existing sediment traps,
sediment basins, and temporary stabilization measures. All
additional E&S control measures and repairs should be performed /
installed in accordance with NCDENR approved standards and the
approved Erosion and Sediment Control Plan (by others).
Temporary and permanent seeding measures should be applied at the
earliest opportunity across exposed (non-actively graded) portions of
the site.
All existing and new E&S devices should be inspected and cleaned
out (sediment removed from upstream of the devices) as required.
Typically the frequency of inspection is weekly, and after each
rainfall event of 0.5 inches (or greater).
Step 2 To the extent required by DWQ, manually remove excess Category 1
sediment as identified, and as directed by S&EC on site at the time
of cleanup. Where still evident and not already stabilized with
vegetation, sediment will be excavated to a depth that reaches the
approximate natural grade (as determined by S&EC personnel). All
excavation will be performed by hand. Excavation will be
performed with manual labor using shovels (flat head or "sharp
shooter") and 5 gallon buckets. Caution will be applied so as not to
disturb the original wetland surface.
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Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.1) 1
Existing easements or site trails and roads will be used for vehicular
and mechanized equipment access to assist in mass sediment
removal. Where heavy equipment is used every effort will be made
to reduce the impact to the existing vegetation. No thinning or
clearing of vegetation will be performed. Delineated wetland areas
or streams will not be trafficked with motorized equipment to
perform cleanup operations. Recovered sediment will be transported
away from any channel, wetland, or ponds and disposed of properly
(in accordance with State and local regulations).
Step 3 Impacted wetland areas onsite, (where sediment has been removed)
will be seeded with a native wetland seed mix following cleanup.
The seed mix should include a minimum of four of the following
herbaceous wetland species.
• Virginia Wild Rye (Elymus virginicus)
• Soft Rush (Juncus effusus)
• Sedge (Carex lurida, lupulina, or vulpinoidea)
• Woolgrass (Scirpus cyperinus)
• Cardinal Flower (Lobelia cardinalis)
• Lizard's Tail (Saururus cernuus)
Acceptable wetland seed mixes are commercially available that
include many more species and are designed for specific site
situations. Preference should be given to southeastern seed sources
and/or NC ecotype seeds in order to ensure seeds are adapted to the
local climate. Seed should be applied at a rate of 15 pounds per acre
(or as directed by the seed supplier) and covered with light straw
mulch.
Cleanup operations will be performed under the direct supervision of an individual with a
thorough understanding of the purpose and the delicate manner in which manual methods
should be performed.
Proposed Repair & Stabilization Activities
Based on the findings of the site engineer (CE Group, Inc. of Cary, NC) we understand
that the existing 60-inch culvert at Crossing 1 was installed at the correct elevation. As
previously described it appears that the stream and wetland immediately upstream of the
culvert was excavated (during pipe and headwall installation) and left at the same
elevation as the culvert, thereby perching the culvert. To restore this area, it was
originally proposed that suitable fill material be placed in select locations as directed by
S&EC (after the removal of Category 1 sediment impacts) to raise the elevation of
portions of this area. However based on our most recent site observations (with Agency
representatives) the majority of this area has stabilized with vegetation and as such only a
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Booth Mountain Repair & Stabilization Plan REVISED September 25, 2009
Soil & Environmental Consultants, PA Project No. 8126.D1
limited amount of sediment removal and incidental grading remains to be done. The
restored upstream wetland area will then be planted with appropriate woody vegetation
including Itea virginica (Virginia Sweetspire) and Alnus serrulata (hazel alder) as well as
various herbaceous wetland plants (no woody vegetation shall be planted within 5 feet of
the headwall or wing walls).
NOTE: The original invert elevation of the stream at the culvert was 394.10 feet
and the installed upstream invert elevation of the culvert is 392.91 feet. We
estimate that the surrounding impacted wetland area (including an undefined
channel) was likely at an elevation of approximately 394.30 feet to 394.50 feet.
Any fill placed following the removal of existing sediment will be graded to
roughly restore these elevations.
We also recommend that on the downstream side of the road crossing coir matting be
place on the right hand side (right and left are referenced facing downstream) of the
channel. We also recommend that both the right and left hand side of the stream on the
downstream side be planted with woody vegetation shown on the Construction Drawings
as well as the wetland seed mix described above. No woody vegetation shall be planted
within 5 feet of the headwall or wing walls. To enhance aquatic passage, we recommend
that the top layer of rip rap be removed from the rip rap dissipater within the first 10 feet
closest to the culvert outlet on the downstream side of the road crossing. Coir logs will
also be installed on either side of the dissipater as shown on the Construction Drawings to
reduce the potential for localized erosion at the edges of the existing apron and restrict
sedimentation from the adjacent land surface.
On February 25 and March 5, 2009, S&EC performed a limited-engineering survey of the
existing stream and wetland areas in the vicinity of Crossings 2 and 3, which require
repair and stabilization. The following activities are proposed as part of the attached
Repair & Stabilization Plan. At Crossing 2 approximately 50 feet of Herndon Creek will
be planted with live stakes. Minor grading operations on the stream bank which were
originally proposed are no longer required (described above). The originally proposed
grading operations within the crossing vicinity are no longer warranted (described above)
however the wetland area will be replanted with bare root seedlings except for a 30-foot
wide portion within the sewer easement. See the attached Construction Drawings.
At Crossing 3 approximately 80 feet of the stream channel will be repaired and stabilized.
The stream channel upstream of the crossing will be returned to a more appropriate cross-
section to mimic the immediately adjacent (upstream and downstream) channel segments.
A series of in-channel rock cross-vanes will be installed upstream of the culvert to
stabilize the banks, maintain channel grade and reduce the potential for head-cutting.
Coir matting and live stakes will be utilized to provide additional stability. On the
downstream end of the crossing the riprap apron will be modified to meet the permitted
thickness and dimension. A single rock cross-vane will be installed immediately
downstream of the culvert to maintain grade and allow for aquatic passage. The
downstream end of the apron will be repaired to form a smooth transition with the
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Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.1) 1
downstream (receiving) stream channel. Any exposed channel segments immediately
downstream of the riprap apron will be stabilized with coir matting and live staked.
The approximate areas recommended for stream repair can be seen on the attached
Repair & Stabilization Plan. The full extent of necessary repairs including the number
and location of in-channel structures may be field modified based on site conditions
observed at the time of construction. See the attached Construction Drawings.
Implementation Schedule
Following the review and approval of this Plan by DWQ, cleanup, repair and stabilization
activities will be performed under the supervision of S&EC. We estimate that the
proposed work will be completed (barring any inclement weather) within 60 to 90 days of
the approval of this plan. A close-out letter will be submitted to DWQ following the
completion of site cleanup work and a close-out site visit by S&EC.
Future Monitoring & Maintenance
Once sediment cleanup, repair, and stabilization activities have been completed, we
recommend that the impacted areas be monitored until such time as major site
construction (excluding the construction of individual residences) is completed and
exposed site surfaces have been stabilized with vegetative cover, leaf litter, or a
combination thereof or a period of (3) years, whichever is longer.
Monitoring should consist of observing the impacted areas for the purpose of observing
the condition of the repaired channel bed and banks and stabilized wetland areas.
Observations should be recorded regarding identified sediment loading (if any), its
apparent source, and recommendations made for supplemental cleanup measures and
other necessary stabilization repairs to graded streams and wetland areas.
Existing and Supplemental Erosion & Sediment Control Measures
S&EC recommends that all new and existing E&S devices will continue to be inspected
and cleaned out (sediment removed from upstream of the devices) as required in the
approved site Erosion and Sediment Control Plan and the associated NCGO10000
NPDES General Stormwater Permit. Inspections should continue to be performed
weekly, and within 24 hours after each rainfall event of 0.5 inches (or greater).
Deficiencies and recommendations should be recorded, where applicable, for necessary
repairs or supplementary measures. Corrective actions should be taken as necessary to
eliminate noted deficiencies. All records should be maintained onsite and available on
request to DWQ or other Agencies.
Limitations
Our evaluations, conclusions, and recommendations are based on project and site
information available to us at the time of this letter and may require modification if there
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Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.1) 1
are any changes in the project or site conditions, or if additional data about the project or
site becomes available in the future. This report is intended for use by our Client,
USACE and DWQ on this project. These findings are not intended or recommended to
be suitable for reuse on extensions of the project or on any other project. Reuse on
extensions of this project or on any other project shall be done only after written
verification or adaptation by SOIL & ENVIRONMENTAL CONSULTANTS, PA, for
the specific purpose intended.
Attachment: Repair & Stabilization Plan
Site Photographs 1 through 8
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Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.1) 1
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Photo 1- Crossing 1, Upstream End, Looking Downstream
Toward Impacted Channel/Wetland Segment, May 2008
Photo 2 - Crossing 1, Downstream End, Looking Northeast
Toward Existing Dissipaters, May 2008
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Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.D1
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Photo 3 - Crossing 1, Upstream End, Note Significant Stabilizing
Vegetation and Limited Visible Sediment, February 2009
Photo 4 - Crossing 1, Downstream End, Note Little Change from
Previously Observed Conditions, February 2009
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Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.D1
Photo 5 - Crossing 2, Wetland Area, Note Disturbed Areas,
Depressions and Spoil Piles, January 2009
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Photo 6- Crossing 2, Herndon Creek, Note Destabilized Channel
Banks and Adjacent Disturbed Areas, January 2009
10 of 11
Booth Mountain Repair & Stabilization Plan
Soil & Environmental Consultants, PA
REVISED September 25, 2009
Project No. 8126.1) 1
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Photo 7- Crossing 3, Upstream End, Looking Downstream
Note Incised Channel and Limited Vegetation, January 2009

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Photo 8- Crossing 3, Downstream End, Looking Northwest,
Note Excessive Riprap Apron Thickness, February 2009
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