20070178 Ver 1_401 Application_20070107

E N G I N E E R L N G & H Y D R p G E O L O G Y
50 COLLEGE STREET, ASHEVILLE, NC 28801 ~ ~ O 7
TEL. [phone] FAC.828.281.3351
www.altamontenvironmental.com ,~ ,, ,,~ , r, ,
January 25, 2007 1°; . r i : ~ :.'d
~FGEIVED
Mr. Steve Chapin Ms. Cyndi Karoly
US Army Corps of Engineers NCDENR, Division of Water Quality
151 Patton Avenue, Room 208 401 Wetlands Unit
Asheville, NC 28801-5006 1650 Mail Service Center
Raleigh, NC 27699-1650
Mr. Kevin Barnett Mr. David McHenry
NCDENR, Division of Water Quality NC Wildlife Resource Commission
Asheville Regional Office 20830 Great Smoky Mountain Expressway
2090 U.S. Highway 70 Waynesville, NC 28786
Swannanoa, NC 28778
Subject: Streambank Stabilization
DWR-03-Ostin Creek / Arledge Properties
Polk County, North Carolina
Dear Mssrs. Chapin, Barnett, Karoly, McHenry:
Enclosed please find the pre-construction notification (PCN) for Streambank stabilization on property
owned by the Arledge family in Polk County. Work applied for in this permit includes Streambank
stabilization and debris removal.
The project site has been identified by the Polk County Soil and Water Conservation District as one area
eligible for North Carolina Department of Environment and Natural Resources (DENR), Division of
Water Resources (DWR) Water Resources Development Project Grant funding. The State of North
Carolina has recently provided funding through the DWR for damaged areas that were not addressed by
the federal Emergency Watershed Protection (EWP) program.
The project area consists of approximately 1,600 feet of steeply eroding Streambank located along Ostin
Creek near the community of Mill Spring. A site vicinity map is included as Figure 1 of the attached
PCN document. Ostin Creek is classified by the DENR as "C, Tr" waters throughout the project area.
Mr. Ryman has signed the application as an authorized agent for Polk County and the property owner. A
letter of authorization is attached at the end of the PCN document.
Altamont appreciates your review of this application. If you would like additional information, please
contact the undersigned.
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PCN-North Pacolet River/ Schuvart Properly Streambank Restoration ~~ ~^ ; Rl~~°~``
cc (letter only): Polk County Soil and Water Conservation District
P:\Polk SWCD NRCS\Polk DWR aroiects 02-08\Arledge Site-DWR-03\PCN cover letter .doc

Office Use Only: Form Version May 2002
20070 1 78
USAGE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
I. Processing
Applicant: Polk County Soil and
Water Conservation
District
PO Box 236
# 4 Annex Building
Columbus, NC 28722
Telephone: [phone]
1. Check all of the approval(s) requested for this project:
® Section 404 Permit ^ Riparian or Watershed Buffer Rules
Section 10 Permit ^ Isolated Wetland Permit from DWQ
® 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide 13
3. If this notification is solely a courtesy copy because written approval for the 401 Certification is
not required, check here: ^
4. If payment into the North Carolina Wetlands Restoration Program (NCWRP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), complete
section VIII and check here: ^
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page 4),
and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further details), check here: ^
II. Applicant Information
1. Owner/Applicant Information
Name: Property Owner: Donald Arledge
Mailing Address: 540 Cow Crossing Lane
Saluda, NC 28773
Telephone: [phone]
~,jei,l I r i r ~~ l
RECEIVED
Fax: [phone]
Email: sandra.reid(a~nc.nacd.net
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter must
be attached if the Agent has signatory authority for the owner/applicant.)
Name: Stuart A. Ryman
Company Affiliation: Altamont Environmental, Inc. 0 ~ ~ ~'!~~
Mailing Address: 50 College Street ~,~
Asheville, NC 28801 ~~ i~~ ~ ~+ ZC07
Telephone Number: [phone] Fax Number : [phone]
E-mail Address: sryman(a~altamontenvironmental. com ""~'~r` `~'" ~~ `~""L'T~~
TtANp,4 M!0 5TC~fiMYuAT6R BRANGH
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III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
Name of project: DWR Project- 03-Ostin Creek/Arledge Property Streambank Stabilization
Note: The entire project area is located within the boundaries of three large tracts of land by the
Arledge family. Because the tracts are quite large, Figure 2- Site Plan does not show all property
boundaries. Correspondence regarding the properties should be addressed to Donald Arledge at
the address shown above. Correspondence regarding the permit or other aspects of the project
should be addressed to Altamont Environmental, Inc. at the address shown above.
1. T.LP. Project Number or State Project Number (NCDOT Only): N/A
2. Property Identification Number (Tax PIN): Map # P-56 Parcel # 77 Account # 12024, Map #P-
56 Parcel #78 Account # 23596, and Map # P- 43 Parcel # 81 Account # 12035
3. Location
County: Polk Nearest Town: Columbus, NC
Subdivision name (include phase/lot number): N/A
Directions to site (include road numbers, landmarks, etc.):
From I26 east, exit at the Columbus / Tryon exit # 67 and follow the signs to Columbus. Follow
Highway 108 through the town of Columbus approximately four miles to the community of Mill Spring
at the intersection of Highway 9 and 108. Turn left (north) on Highway 9 and immediately make a left
on Silver Creek Road (State Road 1138). Follow Silver Creek approximately three and one half miles
and turn left on Holbert Cove Road (State Road 1142). The site is located on the east (left) side of
Holbert Cove Road approximately 2, 000 feet from the intersection of Silver Creek Road and extends to
the bridge on Cow Crossing Lane over Ostin Creek.
4. Site coordinates, if available (UTM or Lat/Long): 035° 18' 26.33 N, 082° 13' 01.40 W
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
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5. Property size (acres): approximately 67 acres; Disturbed acreage will be approximately 0.90
acres.
6. Nearest body of water (stream/river/sound/ocean/lake): The project is adjacent to Ostin Creek.
7. River Basin: Broad River
(Note -this must be one of North Carolina's seventeen designated major river basins. The River
Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.)
8. Describe the existing conditions on the site and general land use in the vicinity of the project at
the time of this application:
Ostin Creek was significantly damaged by tropical storms Frances and Ivan in September, 2004.
Furthermore the project area exists in an area used heavily by livestock. These conditions,
coupled with development upstream in the watershed, disturbances in the watershed, and storm
events since 2004 have left the streambanks in a poorly vegetated and eroding state.
Many streams and rivers in Western North Carolina that were damaged by the 2004 tropical
storms were repaired using funds provided by the Natural Resource Conservation Service
(MRCS) as part of the Emergency Watershed Protection (EWP) program. The NRCS program
required economic justification for discrete repairs and primarily addressed flood damaged
areas adjacent to homes or commercial agricultural areas. As a result, some severely impacted
streams adjacent to undeveloped agricultural or forest land were not addressed by the EWP
program.
The State of North Carolina has provided funding for this project through the North Carolina
Department of Environment and Natural Resources (DENR) Division of Water Resources
(DWR) Water Resources Development Project Grant program for damaged areas that were not
addressed by the EWP program. The DWR grant program targets streambanks that are actively
contributing sediment to a stream and reducing water quality. The Arledge site has been
identified by the Polk County Soil and Water Conservation District as one area eligible for DWR
funding and for this project DWR funding will be coupled with NRCS cost share funds to fence
cattle out of the stream and to establish a minimum 20 foot buffer between livestock areas and
the stream.
The project area is situated on three tax lots owned by various members of the Arledge family.
The proposed project site consists of woodland areas and livestock pasture. Surrounding land
consists of rural residences, woodland and farmland. The project area encompasses a total of
approximately 1,900 feet of Ostin Creek. The project area is bounded by the Cow Crossing Lane
Bridge at the upstream extent of the project and a near vertical I S foot high eroding streambank
and river bend to the left at the downstream end of the project area (see Figure 1). A detailed
assessment of the project area is included as Attachment A.
Planned bank stabilization and riparian planting will address at least 1, 600 feet of bare eroding
bank and poorly vegetated areas. Approximately 200 linear feet of a near vertical, 1 S foot high
eroding bank on river left at the downstream end of the project area is within 60 feet of Holbert
Cove Road. streambank stabilization activities in this area may require coordination with the
North Carolina Department of Transportation (DOT) for work within their right of way.
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Ostin Creek is classified by the DENR as "C; Tr" waters throughout the project area and
therefore, a Trout Buffer Waiver will be applied for from the Land Quality Section in Raleigh.
The North Carolina Wildlife Resources Commission classifies this reach of stream as
"Undesignated Waters ".
Describe the overall project in detail, including the type of equipment to be used:
SUMMARY
The project will consist of streambank stabilization and planting of riparian vegetation. Stream
channel relocation is not anticipated. The streambanks will be stabilized using a combination of
techniques including:
• Grading to reduce the slope
• Installation of rootwads and rock or log vanes to reduce near bank stress
• Installation of erosion control matting and bioengineering structures, and
• Planting of native trees and shrubs.
streambank slopes along Ostin Creek will be made less steep with the use of a track mounted
excavator and will be adjusted to a final slope of approximately three horizontal to one vertical
in areas accessible to heavy equipment. Care will be taken to minimize damage to existing
quality riparian vegetation. In areas where large living trees are too close to the existing bank
to allow for such a slope, the slope will be softened as much as possible without causing damage
to trees that are holding the bank in place. Root wads may be installed just upstream of areas
where the bank is steeper. to deflect and dissipate stream flow away from the bank.
The toe of some repaired steambanks may be reinforced in higher stress areas with large
angular boulders. In these areas one row of boulders will be placed in a footer trench. The
footer trench will be lined with filter fabric. Depending on the vulnerability of the area, another
tier of large boulders may be placed on top of the footer rock and set back approximately one-
two feet in order to match the slope of the streambank. Void spaces behind the footer and tiers
of rock will be back-filled with material that was excavated during the installation of the footer
trench. When backfilling is complete excess filter cloth protruding from between the boulders
and the backfill will be trimmed to an elevation slightly higher than the elevation of the top of the
boulder toe protection. Single veins and cross veins constructed of either large angular rock or
hardwood tree trunks may also be used to help turn flow in bends and protect streambanks in
high stress areas on the outside of turns in the stream.
Live fascines will be buried in the streambank, where feasible, at an elevation approximately
equal to bankfull. Fascines will consist of bundles of a variety of live stakes taken from native
species of trees. The live cuttings used for fascine bundles will be no larger than one inch in
diameter and will be approximately three to four feet in length. Tips of live cuttings will be
oriented in the same direction but cut to varying lengths before placement in the fascine
bundles. Fascine bundles will be bound together with heavy biodegradable twine and placed in
trenches with the tips facing in an upstream direction. The live Fascines will take root and
quickly begin to anchor and further strengthen the toe of the streambank slope soon after
installation.
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After the streambank slopes are adjusted, and stabilization measures (e.g., toe protection,
vanes, rootwads, and fascines) are installed, disturbed non-vegetated areas of the project will
be hand seeded with grasses consistent with the recommendations contained in the North
Carolina Sediment Control, Planning and Design Manual. Coir and Jute matting will be
installed over the areas of bare soil, trenched in on all sides and held down by wooden and live
stakes. Hydro-seeding of these areas with a native seed mix will follow, and caution will be
used to keep seed, mulch and tackifiers out of the river and above the typical high water
elevation in order to reduce the risk of eutrophication. Finally the remainder of poorly or non-
vegetated streambanks will be planted with a variety of native bare-root, container and live-
stake trees and shrubs to a width no less that 20 feet from the waters edge along the reach of
the project area. All plantings will be watered in after installation and subsequently, as needed.
These plantings will help re-establish riparian vegetation within the project area reducing
sediment load to the stream, providing a more stable streambank and future shading of the river
channel.
The project may include removal of debris (i. e. large trees and brush) from the stream channel
that is currently obstructing water flow, limiting hydraulic capacity of the river channel and
forcing flow into unprotected banks. Debris that is stable and is situated such that it is
protecting vulnerable banks will be left in place. Trees removed as debris and their root balls
may be used for bank stabilization and as aquatic and terrestrial habitat as rootwad structures
and vanes in several locations within the project area.
Rootwads are planned for use where the existence of large live trees will not allow grading of
the streambank to a preferable three horizontal to one vertical slope. Trees selected for
rootwads will be at least 24 inches in diameter and will be cut I S to 20 feet up the trunk from
the roots and sharpened to a point with a chainsaw. In locations where rootwads are used, a
trench will be excavated large enough to burry a footer log parallel to the streambank at the toe
of the slope. The rootwad will be inserted, sharpened trunk first, into the bank and the trunk
just above the roots will rest on the footer log. The rootwads will be oriented so that stream
flow is deflected away from the streambank to protect large living trees in these locations.
Placement of the rootwads at an angle approximately 75 degrees from the upstream bank will
provide deflection of flow in an effort to preserve near bank mature live trees. (Note: Rooiwad
structures are not recommended in areas where there is less than 1 S percent silt and clay
content in streambank. A licensed geologist will inspect the soil at proposed rootwad locations
to determine sand content of the streambank soils.)
Rootwads and footer logs will be installed so that the bottoms of the structures extend to the
maximum scour depth of the channel and the top of footer log and bottom of rootwad log are
roughly the same elevation as the stream invert. Rootwad trunks will be inserted into the
streambank by a track mounted excavator so that the root ball is exposed and at least two thirds
of the trunk is buried in the bank. Rootwads and footer logs will be backfrlled with material
excavated from footer log and rootwad trenches and where necessary will be stabilized on
either side with large angular rock or rip rap.
Equipment used to accomplish the above tasks will include: rubber tired back-hoe /loader,
track-mounted excavator with hydraulic thumb, one or two I S ton dump trucks, and hand tools.
A wood chipper may be used to reduce the amount of debris to be hauled away from the site and
minimize potential disposal fees. Wood chips may be used to mulch areas beyond the top of
bank.
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DETAILS
The following activities are proposed within the project area:
Site vicinity and general locations of streambank and channel repair areas are provided in
Figure 1 and 2. Representative photographs with typical construction plans superimposed
are included as Figures 4a through 4c. Across-section of both the existing streambank and
proposed streambank slope plans are included as Figure 5. Typical plans for construction
of specific structures are include as Attachment B. Estimates of shear stresses within the
project area at elevations ranging from 1 to 7.2 feet above the thalweg were calculated and
a cross-section indicating elevations at which shear stress was calculated are included as
part of the Trout Buffer Waiver Request included in Attachment C. General work elements
are described below.
• Before construction at the site begins, existing live trees and vegetation to be saved will
be flagged. Project area boundaries will also be clearly identified and marked.
• Debris generally consisting of trees, stumps and woody material will be removed from
the stream channel using the track mounted excavator equipped with a hydraulic thumb.
Some of the larger dead trees may be staged on-site for use as rootwads structures.
• Using the track mounted excavator and the backhoe, streambank slopes within the
project area will be adjusted from their near vertical state to a slope of approximately
three horizontal to one vertical or flatter, except where desirable large living trees close
to the bank prohibit grading. In these areas rootwad structures may be installed and
slopes will be softened as much as possible.
• If possible, an excavator with along-arm or long-stick boom will be used for this project
to reduce or eliminate the need to enter the stream channel. The excavator to be used
for this project will be a 200 series or comparable machine and will be inspected for
fuel and hydraulic leaks prior to use on this project. Woody debris removed from the
channel maybe reused as rootwad structures or disposed of either as firewood, chipped
into mulch, hauled to an appropriate landfill or some combination there of.
• For streambank areas where rock toe protection is used, a footer trench will be
excavated at the toe of the slope. The footer trench will be excavated to a depth of
approximately two feet or deep enough to bury each footer rock to a depth equal to
three-quarters of its thickness. Ideal dimensions for large angular rock to be used at the
site are four feet by three feet by two feet, or larger. Footer trenches will be dug in a
downstream to upstream sequence in order to limit the amount of sediment discharged
to the stream and limit the flow of water into the trench. Footer trench lengths will be
dug in sections equal to the width of the filter cloth to be used for the project in order to
limit disturbance of the channel bed material. Completing the project in sections will
limit the number of times the trench will have to be re-excavated due to sediment
washing in to the trench. Footer trenches at their upstream and downstream ends will
be keyed in the streambank so that during periods of high jlow, water cannot get behind
the rock toe protection and compromise the structure.
After a section of footer trench is dug, filter cloth will be placed in the trench and a
sufficient amount of cloth will be extended up the streambank to back the footer and next
tier of rock once it is placed. Footer rock of a size described above will then be placed in
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filter cloth will be held up while .the void behind the rock is backfrlled with material that
was excavated from the trench.
• When construction of the rock toe and rootwad structures is complete, a trench will be
dug parallel to the water at an elevation approximately equal to bankfull. Live fascines
will be installed in the trench and the trench will be backfrlled. Fascine trenches will be
excavated to dimensions slightly smaller than the fascine bundle, so that the top of the
fascine is exposed. Live stakes will be driven through the fascines to secure them in
place. Subsequent growth of the fascines will further stabilize the toe of the streambank
as roots interlock with soil, matting and rock in these locations.
• After completing the work described above, all disturbed areas will be hand seeded with
annual grasses. Coir mat will be installed over the completed fascines and bare soil
near the toe of the streambank and will extend up the streambank to an elevation above
bankfull elevation. Jute mat will be used on the upper portion of the slopes to stabilize
soils during initial growth of vegetation. On-site temporary seeding and mulching will
occur on the remainder of bare soil within five days of ground disturbing activities to
provide long-term erosion control.
• When the construction portion of the project is complete all disturbed areas will be
hydro-seeded with a native seed mix above typical high water elevation. Care will be
taken to keep seed, mulch, fertilizer and tackifiers out of the stream to prevent the risk of
euotrophication downstream.
• After hydro-seeding, all disturbed areas within 20 feet of the top of bank will be planted
with a diverse variety of bare-root and live-stake native plants, shrubs, and trees based
on observations made of plants that are naturally occurring within the stream corridor
or could exist with in the region. Planting will conform to the guidelines prescribed in
the DENR Ecosystem Enhancement Program, Guidelines for Riparian Buffer
Restoration. Re-seeding will be conducted, as necessary, with a native annual and
perennial seed mix with a temporary nursery crop of wheat, millet, or other grain.
Woody vegetation will be planted during the appropriate planting season while
dormant. Planting expected to take place during cool weather months.
Stabilization of streambanks will require placement of material in wet conditions. In such
cases, sand bags, or the equivalent, will be used to deflect water flow away from the work area,
as well as prevent water from accumulating in the work area. Standard erosion and
sedimentation control measures will be utilized throughout the project.
Care will be taken to avoid adverse affects to adjacent or downstream property owners.
At the work site, work shall proceed from downstream to upstream to reduce sediment loading.
Staging areas for equipment and material will be placed in upland areas away from surface
water and out side of the floodplain. Work will proceed as follows at the work area (as
applicable).
1. Flag the work limits.
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2. Mark live trees and shrubs to be protected.
3. Construct temporary construction entrance /exits, where necessary.
4. Place erosion control fencing and other protective measures as necessary.
S. Inspect and maintain repairs.
Explain the purpose of the proposed work:
Work being conducted by the Polk County Soil and Water Conservation District Office and
Altamont, is being funded through the North Carolina Division of Water Resources grant. The
grant is intended to fund projects in hurricane damaged areas that were not addressed by the
federal Emergency Watershed Protection program. The purpose of the project in this specific
area is to stabilize the streambanks, restore and widen the riparian corridor along the banks of
Ostin creek within the project area and to reduce the amount of sediment entering the stream by
reducing erosion of the streambanks.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules.
NA
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
No
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must be shown on a
delineation map, whether or not impacts are proposed to these systems. Wetland and stream
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evaluation and delineation forms should be included as appropriate. Photographs may be
included at the applicant's discretion. If this proposed impact is strictly for wetland or stream
mitigation, list and describe the impact in Section VIII below. If additional space is needed for
listing or description, please attach a separate sheet.
1.Provide a written description of the proposed impacts:
Proposed impacts include streambank stabilization and riparian buffer widening and
enhancement. Precautions will be taken to keep heavy equipment out of the water except where
absolutely necessary to install bank stabilization measures and retrieve debris. Work will be
conducted in the dry to the extent practicable. Sediment and erosion control measures, including
sand bags, silt fences and reseeding, will be utilized to minimize sedimentation and erosion.
2.Individually list wetland impacts below:
Wetlands will not be impacted at this site.
Wetland Impact
Site Number
(indicate on ma)
Type of Impact* Area of
Impact
(acres) Located within
100-year Floodplain**
(es/no) Distance to
Nearest Stream
(linear feet)
Type of Wetland***

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: mechanized clearing, grading, till,
excavation, flooding, ditching/drainage, etc. For dams, separately list impacts due to both structure and flooding.
* * 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online at http://www.fema.gov.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: None
Total area of wetland impact proposed: N/A
3.Individually list all intermittent and perennial stream impacts below:
Stream Impact Length of
Stream Average Width
of Stream
Perennial or
Site Number (see Type of Impact* Impact Name** Before Impact Intermittent?
Figure 1) (linear feet) (ft)
Ostin streambank stabilization
Creek/Arledge and riparian buffer 1,600 Ostin Creek 31 ft @ bkf Perennial
Property project restoration
* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and a8er, and net loss/gain),
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stabilization activities (cement wall, rip-rap, crib wall, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is
proposed, plans and profiles showing the linear footprint for both the original and relocated streams must be included.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.usgs.gov. Several Internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.maP9uest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: Approximately 1, 600
linear feet
4.Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
There will be no impacts to open waters.
Open Water Impact

Site Number
(indicate on ma)
*
Type of Impact Area of

Impact
(acres)
Name of Waterbody

(if applicable) Type of Waterbody

(lake, pond, estuary, sound,
ba ,ocean, etc.)

• List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation,
dredging, flooding, drainage, bulkheads, etc.
S.Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ^ uplands ^ stream ^ wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge_PCN.doc Page 14 of 18

financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts.
On behalf of the Polk County Soil and Water Conservation District, Altamont will provide
contractors engaged in the implementation of this work both written and verbal instructions of all
impact avoidance statements provided in this document. All heavy equipment will be kept out of the
stream channel during streambank stabilization work and debris removal except where absolutely
necessary to complete work. Disturbance of the channel bottom, streambanks and equipment
access areas shall be held to the minimum necessary to allow for implementation of bank
stabilization work. Temporary grass cover shall be planted on all bare soil within 5 days of
ground disturbing activities. Straw mulch and tall fescue grass will not be used in riparian areas.
Herbaceous, woody shrub and tree vegetation will be installed on the streambank upon completion
of bank stabilization work Altamont will provide a site manager to routinely inspect and
supervise contractor work to help ensure impact avoidance instructions are being followed.
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCWRP concurrence shall be placed on hold as
incomplete. An applicant may also choose to review the current guidelines for stream restoration
in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at
htt~ //h2o.enr.state.nc.us/ncwetlands/strmgide.html.
1.Provide a brief description of the proposed mitigation plan. The description should provide as
much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge_PCN.doc Page 15 of 18

description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
N/A
2.Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): N/A
Amount of buffer mitigation requested (square feet): N/A
Amount of Riparian wetland mitigation requested (acres): N/A
Amount ofNon-riparian wetland mitigation requested (acres): N/A
Amount of Coastal wetland mitigation requested (acres): N/A
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federaUstate) land?
Yes ® No ^
If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ^ No ®xx
If yes, has the document review been finalized by the State Clearinghouse? If so, please attach a
copy of the NEPA or SEPA final approval letter.
Yes ^ No ^
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed. to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge_PCN.doc Page 16 of 18

Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify)?
Yes ^ No ® If you answered "yes", provide the following information:
Identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer
mitigation is required calculate the required amount of mitigation by applying the buffer
multipliers.
*
Zone Impact
(s uare feet)
Multiplier Required
Miti ation
1 3
2 1.5
Total
* Zone 1 extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration /Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or .0260.
XI. Stormwater (required by DWQ)
Describe impervious acreage (both existing and proposed) versus total acreage on the site.
Discuss Stormwater controls proposed in order to protect surface waters and wetlands
downstream from the property.
Impervious acreage will not change at the project site, and other than Holbert Cove Road, which
is adjacent to the project site and is asphalt; impervious surfaces do not exist at the site. Erosion
and sedimentation prevention and control will be maintained throughout this project primarily
through proper water management, construction sequencing, proper staging and stockpiling of
materials, and through maintenance, at all times, of suitable channel capacity for expected flow
events. Equipment, fuels, lubricants, or other potential sources of water pollution will not be
stored in areas that could be flooded during this project.
XII. Sewage Disposal (required by DWQ)
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.
Wastewater will not be generated as part of this project.
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge_PCN.doc Page 17 of 18

XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ^ No
Is this anafter-the-fact permit application?
Yes ^ No
XIV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened,8'~ecies, access}bility~roblems, or other issues outside of the applicant's control).
Zs'~~~
Applicant/Agent's
Date
(Agent's signature is valid only }~ an authorization letter from the applicant is provided.)
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge_PCN.doc Page 18 of 18

ACCESS AGREEMENT
This Access Agreement is made between Polk County Soil and Water Conservation
District Supervisor Board (SWCD) and:
-Streambank Stabilization -Native plant Re-vegetation
-Debris Removal -Exotic/Invasive plant removal
SWCD and the Property Owner agree:
1. Property owner grants permission to SWCD and its contractors and agents to
enter upon their land for the purpose of assessing and repairing the flood damage
caused by Hurricanes Frances and Ivan. Additionally, this agreement includes the
right of ingress and egress on the land for the purpose of maintaining the
emergency works for the period of one year from the date of completion.
2. Property owner grants permission to SWCD and its contractors and agent to
conduct stream stabilization measures, which may include debris removal, stream
bank stabilization using rocks, wood, and/or, mulching and seeding, and/or
channel relocation.
3. SWCD agrees to comply with local, state, and federal laws applicable to the work,
and further agrees to exercise due care and caution in the performance of all work
on the Property.
4. This Agreement constitutes the entire understanding between the parties. All
prior agreements or understandings, whether oral or written, are superseded. This
Agreement may be amended only by a written document duly executed by the
parties.
5. The proposed measures are intended to repair flood damage to the stream and to
.return affected areas to pre-flood conditions. Repair and/or improvements to
structures are not part of this project. Damaged bridges, driveways, and eroded
fields. are not addressed by measures. SWCD and its contractors will strive to
minimize impacts to adjacent properties. However, some impact may be
unavoidable. The Property owner releases SWCD and its contractors from
liability for any damage incurred as result of this work.
6. This agreement does not provide confirmation that the subject site is eligible for
Emergency Funds, nor does it encumber funds for any repair work at this site.
7. Property owner agrees not to remove or modify construction repairs, including
vegetation, for one year from .the date of completion.
The SWCD is requesting access to the property for the purpose of assessing and repairing
damage to the streambank, stream channel, and floodplain that was caused by hurricanes
Frances and Ivan and more recent storms. The repair work will include some or all of the
following elements:

8. SWCD will discuss the draft design with the Property Owner prior to submittal
for permitting.
9. Property Owner agrees to reimburse SWCD for all costs. associated with the
design if the property owner decides to terminate this agreement after work has
begun.
10. The Polk County Soil and Water conservation District and Polk County property
owners hereby authorize Altamont Environmental Inc. (Agent/Consultant) to sign
and execute all necessary permits and coordinate communications. with the
appropriate regulatory agencies.
Polk County Soil and Water Conservation District

Date: ll-~C~~D(~
SWCD or Representative
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50 COLLEGE: STREET, ASHEVILLE. NC 28801
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www.altamontenvuonmental.com
ARLEDGE PROPERTY
DRAWN BY: JOEL LENK SCALE (FEET) POLK COUNTY, NORTH CAROLINA
PROJECT MANAGER' STU RYMAN
CLIENT: PCSWCD ~soo 0 ~soo 3000
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www. altamontenvuonmentAl. com
DRAWN BY: PAUL DOW SCALE (FEET)
PROJECT MANAGER: STU RYMAN
CLIENT: POLK COUNTY 5 0 5 10
DATE DESCRIPTION BY CHK APV DATE: 01-25-07
CROSS-SECTIONS
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50 COLT-EGE STREET, ASHEVILLE, NC 28801
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www.alta~nuutenvironmen[al.com
ARLEDGE PROPERTIES
DRAWN BY: JOEL LENK POLK COUNTY, NORTH CAROLINA
PROJECT MANAGER: STU RYMAN NOT TO SCALE
CLIENT: PCSWCD
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E N G I N E E R I N G & H Y D R O G E O L O G Y
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL [phone] FAC' 828.281.3351
www.altamon[environmental. com
DRAWN BY: JOEL LENK
PROJECT MANAGER: STU RYMAN NOT TO SCALE
CLIENT: PCSWCD
DATE: OI-25-07
CONCEPTUAL DESIGN
PHOTO 2
DWR-03-OSTIN CREEK /
ARLEDGE PROPERTIES
POLK COUNTY, NORTH CAROLINA
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TEL [phone] FAC.828.281.3351 1
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PROPERTIES
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River Left River Right
+' 510
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Ir~pairecl Ri-Ff le
LEGEND
EXISTING STREAMBANK SLOPE
- - - - - - PROPOSED STREAMBANK SLOPE
+4-..._®_ ._..__ __ ELEVATIONS ABOVE THALWEG FOR WHICH
SHEAR STRESS WAS CALCULATED
I Y D R O C E O L O G Y
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL.[phone] FAC.828.281.3351
www. altamon[environmental. com
DRAWN BY: PAUL DOW SCALE (FEET)
PROJECT MANAGER: STU RYMAN
CLIENT: POLK COUNTY 5 0 5 10
DATE: OI-25-07
PROPOSED SLOPE FIGURE
CROSS-SECTIONAL AREAS
DWR - 03 - OSTIN CREEK / ARLEDGE PROPERTY 5
POLK COUNTY, NORTH CAROLINA

ATTACHMENT A
Level III Assessment

ENGINEERING 8~ HYDROGEOLOGY
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL. [phone] FAC.828.281.3351
www.altamontenvironmental.com
20070178
January 9, 2007
Ms. Sandra Reid
District Administrator
Polk County Soil & Water Conservation District
P.O Box 236
#4 Annex Building
Columbus, North Carolina 28722
Re: DWR Project 03
Assessment of Stream Condition - Ostin Creek on the Donald Arledge Property
540 Cow Crossing Lane
Saluda, NC 28773
Dear Mrs. Reid:
Altamont Environmental Inc. (Altamont) has completed a Level III Assessment of existing conditions on
the stream reach described above and has analyzed the stream's departure from it's full natural potential
The procedures used were consistent with those outlined in the Apri12003 North Carolina Agricultural
Cost Share Program (NCACSP) Manual. This letter documents the results of the Level III Assessment
and analysis as well as other information regarding the project area.
BACKGROUND
The Polk County Soil and Water Conservation District (SWCD) received a grant from the North Carolina
Department of Environment and Natural Resources (DENR), Division of Water Resources (DWR) to
stabilize eroding streambanks on seven properties in Polk County. To secure the grant, SWCD staff
inventoried the damage at the subject sites and obtained preliminary approval from the landowners for
the proposed repairs. However, detailed assessments were not completed. Upon receiving the grant, the
SWCD retained Altamont to complete a detailed assessment of each site, design repairs for the damaged
areas and submit the designs to the United States Army Corps of Engineers (ACOE) and the North
Carolina Department of Environment and Natural Resources (DENR) for permitting in the fornl of a Pre-
Construction Notification (PCN) for this project.
The SWCD desires to incorporate natural channel design elements into the repairs, where possible.
However, detailed natural channel design procedures are beyond the scope of this project. As an initial
step, the SWCD required Altamont to complete a Level III assessment on each reach identified by the
SWCD to quantify the impacts and establish a basis for the design of the stabilization measures.
This letter documents the assessment techniques and the findings associated with the site identified as
DWR Project 03 located on Ostin Creek. The project area, consisting originally of three reaches, lies in a
broad, gently sloped valley between Chimneytop and Piney Mountain to the southwest and White Oak
and Little White Oak Mountains to the southeast. The downstream extent of the project area is
approximately 2.6 miles upstream from the confluence with the Lake Adger /Green River. The proposed
project area is currently divided into two reaches, a short upstream reach, approximately 300 feet in
P:\Polk SWCD NRCS\Polk DWR projects 02-08\Arledge Site-DWR-03\Arledge Level III Letter.doc

Ms. Ried
January 9, 2007
Page 2 of 5
length, and a longer downstream reach that is approximately 1,900 feet in length. Altamont has focused
its assessment efforts on the downstream reach due to an extensive exotic evasive plant population that
exists throughout the upper reach and prevents cost effective implementation of repairs. The downstream
reach extends from the Cow Crossing Lane Bridge located off of State Road 1142 (Holbert Cove Rd.)
1,900 downstream to a prominent, vertical, 15 foot high bank and bend in the stream to the right. A site
location map is attached as Figure 1.
LEVEL III ASSESSMENT
Between December 4 and 6, 2006 Altamont representatives analyzed the condition of the stream. During
the assessment, Altamont utilized various forms to guide and document field data collection activities,
including: a Level III Assessment form (from pagesV-82 and V-84 of the NCACSP Manual) a Stream
Survey Data Sheet, a Qualitative Riparian Vegetation Assessment Guide, a Channel Stability Rating
form, and a Bank Erosion Hazard Index form. Copies of these documents are attached. Also attached is
a longitudinal profile, cross-sections and photographs of the assessed reach of Ostia Creek.
Ostia Creek in the project area is classified as a G4c stream using the Rosgen Classification of Natural
Rivers. The following paragraphs provide supplemental information and support the data included on the
attached forms. The bold and underlined text corresponds to specific fields on the Level III Assessment
sheet.
Riparian Vegetation within the project area is generally in very poor condition due to livestock impacts,
bank erosion and an abundance of exotic invasive plants (e.g. Kudzu). Livestock are allowed to graze to
the waters edge and cross the creek in numerous locations within lower the project area. hi areas where
livestock are present existing vegetation consists mainly of pasture grasses and mature trees. Bank
erosion has affected riparian vegetation growth on streambanks at many locations. In areas where stream
banks are vertical vegetation is non-existent and these bank are actively contributing sediment to Ostia
Creek and other waters downstream. The upstream project reach is heavily impacted by Kudzu, an
exotic invasive plant that has out competed all other plants on river right. During winter months when
Kudzu dies back, the banks along this reach are left more vulnerable to erosion than in summer months
when the plant provides some minimal erosion protection. The aforementioned factors have had an
adverse affect on the stream channel, water quality and riparian vegetation in the Ostia Creek stream
corridor. Despite relatively poor current riparian conditions scattered areas exist where the opportunity
for transplanting and variety of native herbaceous, shrub and tree species may be possible. Please refer
to the Qualitative Riparian Vegetation Assessment Guide sheet in the attachment to this letter.
Stream Size can be defined by several parameters. For this project, Altamont developed an estimated
stream size (cross-sectional area at bankfull stage in square feet (ft2)) using the regional curve for rural
Piedmont North Carolina Streams (Harman, W.H, et al, 1999). Specifically, the cross sectional area was
estimated by comparing the approximate drainage area to the bankfull cross sectional area shown on the
regional curve. Based upon this evaluation, the bankfull cross-sectional area for a stream with a drainage
area the size of the Ostia Creek should fall between 33 and 150 ftz. The actual bankfull cross-sectional
area measured by Altamont in the project reach is approximately 48 ft2.
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Srledge Site~-ledge Level III Letter.doc

Ms. Ried
January 9, 2007
Page 3 of 5
Cross-sectional area at bankfull stage, bankfull width, and average bankfull depth, as measured in the
field, are represented in the cross sections of the Ostin Creek channel and Stream Survey Data Sheet
attached.
The Stream Order of Ostin Creek is borderline third order, but defiantly falls in the second order
category. A second order stream is defined as a stream in which two or more first order streams have
converged and a third order stream is defined as a stream in which two or more third order streams have
converged.
The Meander Pattern of Ostin Creek can be qualitatively described as meandering. However
topography, road building and bedrock greatly influence the pattern of the stream. Meander Length or
wavelength was calculated to be an average of 241feet. Average Radius of Curvature was measured to
be 89 feet. Average Belt Width is 106 feet, and Sinuosi was calculated to be 1.21. Detailed
assessment of meander pattern is typically completed to aid in natural channel design which is beyond
the scope of this project.
A Channel Stability Rating was calculated using the Pfankuch rating procedure (see the Phankuch
Channel Stability Rating Sheet which is included in the attachment). The Chamlel Stability Ratv~g score
for the assessed reach was calculated to be 139, which falls in the Poor/ Unstable category for a stream
reach classified as G4c.
Sediment Supply determinations were made by using a Bank Erosion Hazard Index (BEHI) method a_nd
near bank stress estimations based on chatmel pattern and cross-sectional shape observed in the field.
Based on this assessment, Altamont classified the sediment supply of Ostin Creek in the project area as
high. Near Bank Stress was observed to be high, particularly in areas where mid cham7el bars force
water to poorly vegetated streambanks and at the outside of channel bends where steep non vegetated
banks exist (see photographs and descriptions in the attachment). The Streambank Erosion Potential
was found to be high based on assessment by the Bank Erosion Hazard Index (BEHI) method and a BEHI
score of 38.
Streambed (Vertical) Stability was found to be degrading based on the Entrenchment Ratio of the
stream. The Width/Depth Ratio Condition was found to be very high. Based on field measurements
the bankfull Width is calculated to be 30.80 feet, the mean bankfull Depth is 1.49 feet and the
Width/Depth Ratio is 20.67 feet.
As discussed, the Stream Type for Ostin Creek in the project reach was determined to be G4c based
Entrenchment Ratio, Width/Depth Ratio, Sinuosity, Stream Type, Slope and Channel Material.
The Flow Regime within the project area is altered and unstable. The Depositional Pattern in the
channel within the project area shows signs of high sediment load in that pools appear to be partially
filled with new sediment and mid and side channel bars have formed in riffle and run areas of the stream.
These changes in the stream chamlel are most likely due to reduction of riparian vegetation within the
stream corridor, livestock disturbance on the streambanks and inadequate sediment and erosion control at
land disturbing activities up stream.
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge SlteWrledge Level III Letter.doc

Ms. Ried
January 9, 2007
Page 4 of 5
Evidence of Debris Blockages were observed during field assessments as stumps of trees that had fallen
into the stream channel due to under cut banks. The majority of blockages appear to have been removed
prior to Altamont's assessment of the stream. A longitudinal Profile of the stream channel was
completed by Altamont, and using the profile survey Water Surface Slope and Valley Slope were
calculated. Bed Features and their relationships were identified in the field on the longitudinal profile.
Features such as Steps, Pools, and Riffles, and Conver~ance/Diver~ance of the stream flow were noted
and entered on the Level III assessment sheet. The channel does not exhibit a Plane Bed channel.
Pool/riffle S acin can be viewed on the longitudinal profile included as Figure 3 in the attachment..
Also included in the attachment are several cross-sections produced from data collected during the
assessment of the project reach.
ADDITIONAL OBSERVATIONS AND CONSIDERATIONS
Before completing the PCN for the Ostin Creek / Arledge property project, there are several items that
should be considered. First, during the assessment, Altamont observed that the 15 foot high vertical bank
at the downstream end of the lower project area is approximately 60 feet from State Road 1142, (Holbert
Cove Road). The width of the right of way needs to be deterinined so that it may be avoided during
construction /restoration of the high bank. The width of the right of way may influence they type, and
effectiveness of repair that can be made at this location.
Altamont suggests that the SWCD consider coordinating the Arledge DWR Project 03 with the North
Carolina Agricultural Cost Share Program project to assist Mr. Arledge with fencing and livestock
crossings. Other options for live stock may also be available. One option may be to let the cattle use the
private Arledge owned bridge over Ostin Creek on Cow Crossing Lane. If this option is acceptable to the
Mr. Arledge, it may eliminate the need for costly cattle crossings over Ostin Creek and be more
beneficial to the stream as well.
Altamont understands that the SWCD estimated that approximately 450 feet of streambank is in need of
stabilization at the two project areas on Ostin Creek. On preliminary site visits Altamont was shown
three individual reaches of Ostin creek. Altamont understands that the reach furthest upstream has been
eliminated from this scope of work.
The middle project area consists of approximately 300 linear feet of 2-3 foot high vertical eroding
streambank on river right. Mr. Arledge is concenied with this area because of the accelerated rate at
which the creek is eroding away his land on river right. Altamont did not spend a great deal of time
assessing this reach of stream because a vast area (40+ acres) on river right is taken over by Kudzu an
exotic invasive perennial plant that is difficult to control. It is Altamont's opinion that until the plant is
eradicated or brought under control in this area, bank stabilization /restoration efforts in this reach would
not be effective. Kudzu grows vigorously in the summer and dies back in the winter leaving topsoil
vulnerable to erosion in the winter months. Successful streambank stabilization projects rely on
vegetation to lock and anchor hard structures and soils in place. If Kudzu is not controlled in this project
reach prior to bank stabilization activities it will shade out native tree, shrub and herbaceous plants
during the sununer and leave the project bare of vegetation the following winter. Altamont recommends
eradicating the plant in this area before installing bank stabilization measures. Streambanks on river left
P:~polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site~Arledge Level III Letter.doc

Ms. Ried
January 9, 2007
Page 5 of 5
within this reach are generally in good condition, well vegetated and host a variety of mostly native tree
shrubs and herbaceous plants.
While conducting the Level III assessment of the Ostin Creek project Altamont observed and measured
1,377 feet of low streambanks that were in need or minor repair /softening and re-vegetation and 222
feet of high vertical banks in need of more complicated repair /restoration and re-vegetation. Our
estimates indicate that approximately 1,600 total linear feet of streatnbank are near vertical, are
supporting little to no vegetation and range in height from one to 15 feet from the waters edge. These
baron banks are actively contributing large amounts of sediment to Ostin creek. Untill contractor bids
are obtained Altamont can not confirm that all of the area mentioned above can be stabilized and the
entire reach be planted with native vegetation for the project budget of approximately $130,000.
Altamont appreciates the opportunity to provide these assessments and options to the SWCD for this
project. We would be pleased to assist you in evaluating DOT right of way and Kudzu eradication if you
wish. Please feel free to contact either of us with questions or comments.
Sincerely,
el D enk, P.G.
Cc: Mr. Gerald Harbinson -Natural Resource Conservation Service
Attachments: Figure 1-Site Vicinity Map
Level III Assessment Fonn
Stream Survey Data Form
Qualitative Riparian Assessment Guide
Phankuch Channel Stability Rating Sheet
BEHI Evaluation Sheet
Figure 2-Stream Layout and Longitudinal Profile
Figure 3- Cross-Sections
Photographs and Descriptions
"Stuart A. Ryman, P.G.
P:~Poik SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge Level III Letter.doc

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• ~ ' ~ VICINITY MAP FIGURE
tN R1N Y R. Y
50 COLLEGE STREET, ASi-iEVtLLE, NC 28801
TEL.[phone] FnC.828.281.3351 DWR-03-OSTIN CREEK/
www. altamontenvvonmental. com
ARLEDGE PROPERTY
DRAWN BY: JOEL LENK SCALE (FEET) POLK COUNTY, NORTH CAROLINA
PROJECT MANAGER: STU RYMAN
CLIENT: PCSWCD X500 0 ~50o sooo
DATE: OI-25-07 P \POUC SWCD NRCS\PGUC PRWFCTS 02-OB\QRLEDGE SITE-DWR-03\FIGLRE$\FIGIC~I.DWG

~tr~amb~nk St~bi~i~~t~~~a
Definition/Purpose
A streambank Stabilization system means the use of bioengineering practices,
native material revetments, channel stablity structures, andior the restoration or
management of riparian corridors in order to protect upland BMPs, restore the
natural function of the stream corridor and improve water quality by reducing
sedimentation to streams from streambank erosion and decreasing the delivery of
nitrogen, phosphorus and other pollutants to the stream from adjacent pasture or
cropland. (DIP)
Policies
1. The use of this BMP for NCACSP funding would be firnited to agricultural
operations where the natural streambank has been severely damaged by
livestock access, or other activities associated with agricultural operations.
Each site should be reviewed by the District Board to determine the eligibility for cost
share funding and prioritize the sites as to the direct effects, Ion ;term benefits
and the landowners vrillingness to be involved, maintain, and support the
practice.
2. Planned practices require a contact with the U.S. Army Corps of Engineers and
the N. C. Wildlife Resources Commission for a}I proposed sites. A Water
Quality certification may also be needed from the N. C. Division of Water
Quality.
3. On livestock operations, fencing off the stream and the iroooded portion of the
riparian area is mandatory.
4. A minimum set-back of 20 feet of undisturbed native vegetation or restored
riparian area adjacent to the installed practice is mandatory in all situations.
5. An analysis of the existing stream condition and the degree of departure for the
existing stream condition from its full operating potential must be made as a part
of the planning and design process for this BMP. The analysis of stream
condition and departure may be made fiollowing the procedures established by
Dave Rosgen in Applied River Morphology; Chapter 6 (Rosgen, 1996).
Rosgen's field survey from, Summary of "condition" Categories for Level III
Inventory may be used to document.the analysis.
6. If the analysis when completed as outlined in Item i~o. 5, shows that the profile,
pattern, and/or dimensions of the stream need to be restored in order to restore
the natural stability and function of the stream, assistance will be required from
a person who has successfully completed P.osgen's Restoration Course or
equivalent natural channel design training.
NCACSP Pd9ANUAL, APRIL 20G3 PAGE V-82

LEVEL III: ASSESSMENT OF STREAM CONDITION AN® DEPArcTURE
SUMMARY OF "CONDITION" CATEGORIES FOR LE`JEL III iNVENTC?RY
Stream Name Ostin Creek
Location Arledge Property, Polk County, NC
Riparian Vegetation Gennerall Poor
Stream Size, Stream order Bkf Area = 48.43. 2nd order
Meander pattern Meandering
Channel stability rating (Pfankuch) 139
Sediment supply (check appropriate category):
Extreme
Very High x
High
Moderate
Low
Streambed (vertical) stability
Aggrading
Degrading x
Stable
Width/depth ratio condition:
Normal (s:~~ie;
High
Very high 20.67
Streambank erosion Potential:
Bank erodibility: Near-bank stress:
Extreme Extreme
High x High x
Moderate Moderate
Low Low
General Remarks
Observers Lenk
Stream Type G4c Date 12-6-06
Flow regime altered and unstable
Depositional pattern excess sedimentation
Debris/channel blockages evidence of, most removed
Altered Channel State:
Dimensionishape:
Width Wbkf= 30.80
Depth Dbkf= 1.49
Width{depth ratio 20.67
Patterns: ('`show as funct. of Wbkf):
iJieander length* Lm = 241 ave.
Radius of curve* Rc = 106 ave.
Belt wdth* Wblt = 89 ave.
Sinuosity 1.21
Profile:
Water surface slope 0.0047
V~ltey sl~rpe 0.0075
Bed features:
Riffle; pool x
Steplpool
Conver_(divrg.
Plane bed
Other
Spacing* See longitudinal profile
Describe alterations: See Level III Letter
Attach photographs taken mid-stream looking up and dov~mstream. Make site map.
Attach vicinity map of reach andlor aerial photo for specific {ocation.
Note any permanent cross-section for level IV verification of cross-section stability, actual erosion rates,
change in pebble counts, deposition studies, sediment sampling, etc.
Attach copy of: ~irsam~,ctassification field form, channel Stability rating form, bank erosion rating form,
profiles, cros~section~ peb ~ounts, etc.
Signature: °- ----~,
NCACSP MANUAL, APRIL 2003 PAGE V-84

Stream Survey Data Sheet
Slte Ostin Creek, Arledge Property
Survey Crew Lenk, Yurkovich, Hazinski
Date 12-6-06
Riffle Cross-Section:
Area at Bankfull, Abp (ft2) 48.43
Width at Bankfull, Wb,~ (ft) 30.80 .
Width Flood Prone Area, W~,a (ft) 43.45
Maximum Depth Bankfull, DmaX (ft) 2.40
Max Depth Top Low Bank, DTOB (ft) 7.24
s.
Mean Depth at Bankfull, Dj,~ = Abja / Wb~ (ft) 1.49
Entrenchment Ratio; ER = W~,a / Wb~ (ft/ft) 1.41
Width to Depth Ratio, W/D = Wb~ / Db~ (ft/ft) 20.67
Bank Height Ratio, BHR = D Tos / Dm~ ($/ft) 3.02
Max Depth Ratio = Dm~ / Db~ (ft/ft) 1.61
Longitudinal Profile (minimum of 20 X bankfull width):
Length of Channel Thalweg, L,,,, (ft) 1286 Slope of Channel, Sa„e = ~ELEV / Lh„ (ft/ft) 0.006
i
' Length of Valley, L,,aijey (ft) 1573 Sinuosity, K = L,,,, / L,,alley (ft/ft) 1.21
Elevation Change (head first riffle to head last riffle), aELEV (ft) 8.08
Pool Cross-Section:
Pool Area at Bankfull, A,pool (ft2) 62.80 Pool Area Ratio = A.poo~ / A61~ (ft2/ft2) 1.30
j Pool Width at Bankfull, W poop (ft) 30.46- Pool Width Ratio = W pool / Wb~ (ft/ft) 0.99
Pool Max Depth Bankfull, Dpooi ($) 3.07 Pool Max Depth Ratio = Dpoo~ / Dike (ft/ft) 2.06
Pattern Survey (minimum of 2 wavelengths, list ranges of measurements):
Meander Wavelength, L~, (ft) 241 Meander Wavelength Ratio = Lm / Wb~ (ft/ft) 7.82
Meander Belt Width, Wbi~ (ft) 106 Meander Width Ratio = Wvu / Wt~ (ft/ft) 3.44
Radius of Curvature, ~ (ft) 89 Radius of Curvature Ratio = ~ / W,;,~ (ft/ft) 2.89
Pebble Count Results (reachwide):
Median Particle Size, d50 (mm) Gravel, Cobble
Rosgen Stream Classification:. G4c

r
Qualitative Riparian Vegetation Assessment Guide
Preliminary Assessment
Project name Ostin Creek, Arledge Prop. Date 12-6-06 proposed Project length 2,300 feet
Existing vegetation
Dominant tree species Sycamore, Wahiut, Locust, Poplar,
Size distribution of trees Most trees in the project area are mature. In wooded non livestock areas saplings exi;
Dominant shrub species Shrub sized plant are scarce in the project area. Some exotic shrubs were observed.
Dominant herbaceous species Pasture grasses, minimal rush was observed by waters edge.
Successional stage, disturbances,
or potential for natural change Succession is taking place. in a few non livestock impacted wooded areas
Patchiness Riparian vegetation is patchy and is broken up by pasture and livestock areas..
Visible Stresses Livestock and bank erosion.
Bank Conditions
Bare banks a roximately 40% of sreambanks are bare within the project area.
Presence and density of large trees Trees exist at the channel edee, tree roots are visible in the banks.
An le and presence of undercuts 70-110 degrees with occasional undercuts.
Material Predominantly clay and silt and sand with lesser amounts of gravel and cobble. Coarsens downward.
Invasive presence Invasive plants are minimal in the downstream reach and Kudzu is dominant in upstream rea
Patchiness Bank height and condition vary but are generally in poor condition
Land use
Wildlife impacts or protection No
Recreational No
Official No
A ricultural and grazing Yes
Mowing No
Herbicides No
Other disturbances Some excavation for cattle crossings
Soil
--
Composition (series if known) Clayey Sandy Silt
Compactedness Majority of soil compacted by livestock
Fertility Soils left on eroded banks appear infertile and will need amendments before planting.
Organic material scarce where erosion has taken place
Testing No
t.
~h
Construction planning
Potential #or transplants Transplant opportunities exist where wooded areas exist to streambanlcs that need stabilization
Potential for tree fencing Care will be taken to not to disturb vegetation except where necessary.
Invasive species Kud Rose
Action recommended Y Y
Dominates site Upst eam r ach N
Looming problem Y N
Insi nificant Y
Sources surround site Y Y

Worksheet 19. Modified Pfankuch Channel Stability Rating Procedure Summary
Stream: Ostiri Reach: Arledge Date: 12-6-~6 Observers: Lerik Comments:
tio
L Ke te
o
C Excellent Good Fair Poor
oca
n y g
ry
a Description Rating Description Rating Description Rating Description Rating
1 Landform Slope Bank slope gradient <30 % . 2 Bank slope gradient 30-40 % . 4 Bank slope gradient 40-60 % . 6 Bank slope gradient 60%+. x 6
y
.Y 2 Mass Wasting No evidence of past or future mass wasting. 3 Infrequent. Mostly healed over. Lvw future 6 Frequent or large, causing sediment nearly 9 Frequent or large, causing sediment nearly
C potential. year long. yearlong OR imminent danger o(same. 7t 12
tD
m
3 Debris Jam Essentially absent from immediate channel 2 Present, but mostly small twigs and limbs. x 4 Moderate to heavy amounts, mostly larger 6 Moderate to heavy amounts, predominantly

a
Potential
area.
-
sizes.
larger sizes. 8
a 4 Vegetative Bank 90%+ plant density. Vigor and variety 3 70-90 % density. Fewer species or less vigor 6 50-70 % density. Lower vigor and fewer x 9 <50 % density plus fewer species & less vigor
~ Protection suggest a deep, dense soil binding root suggest less dense or deep root mass. species from a shallow, discontinuous root indicating poor, discontinuous, and shallow 12
mass. mass. root mass.
5 Channel Ample for present plus some increases. 1 Adequate. Bank overflows are rare. W/D 2 Barely contains present peaks. Occasional R 3 Inadequate. Overbank flows common. W/D
Capacity Peak flows contained. W/D ratio <7. ratio = 8-15. overbank floods. W/D ratio = 15-25. ratio > 25. 4
N 6 Bank Rock 65%+ w/ large angular boulders. 12"+ 2 40-65 % .Mostly boulders and small cobbles 4 20110 % .With most in the 3-6" diameter R 6 <20 % rock fragments of gravel sizes, 1-3" or

Y
Content
common.
6-12".
class.
less. 8
~ 7 Obstructions to Rocks and logs frmly imbedded. Flow 2 Some present causing erosive cross 4 Moderately frequent, unstable obstructions x 6 Frequent obstructions and deflectors cause
m Flow pattern w/o cutting or deposition. Stable bed currents and minor pool filling. Obstructions move with high flows causing bank cutting bank erosion yearlong. Sediment traps full, g
L. fewer and less frm. and pool filing. channel migration occurring.
3
8
Cutting
Little or none. Infrequent raw banks <6".
4
Some, intermittently at outcurves and
6
Significant. Cuts 12-24" high. Root mat
12
Almost continuous cuts, some over 24" high.
J constrictions. Raw banks may be up to 12". overhangs and sloughing evident. Failure of overhangs frequent, R 16

9 Deposition Little or no enlargement of channel or point 4 Some new bar increase, mostly from coarse 8 Moderate depostion of new gravel and 12 Extensive deposit of predominantly fine
bars. gravel. coarse sand on old and some new bars. particles. Accelerated bar development. x 16
10 Rock Angularity Sharp edges and corners. Plane surfaces 1 Rounded corners and edges, surfaces 2 Corners and edges well rounded in 2 X 3 Well rounded in all dimensions, surfaces 4
rough. smooth, flat. dimensions. smooth.
11 Brightness Surfaces dull, dark or stained. Generally not 1 Mostly dull, but may have <35 % bright 2 Mixture dull and bright, ie 35-65 % mixture x 3 Predominantly bright, 65%+; exposed or

bright.
surfaces.
range.
scoured surfaces. 4
12 Consolidation of Assorted sizes tightly packed or 2 Moderately packed with some overlapping. 4 Mostly loose assortment with no apparent X 6 No packing evident. Loose assortment, Basil

Particles
overlapping,
overlap.
moved. 8
O 13 Bottom Size No size change evident. Stable material 80- 4 Distribution shift light. Stable material 50- 8 Moderate change in sizes. Stable materials 12 Marked distribution change. Stable materials

Distribution
100 % .
80 % .
20-50 % .
0-20 % . - 16
x
m 14 Scouring and <5 % of bottom affected by scour or 6 5-30 % affected. Scour at constrictions and 12 30-50 % affected. Deposits and scour at 18 More than 50 % of the bottom in a state of flu
Deposition deposition. where grades steepen. Some deposition in obstructions, constrictions and bends. Some or change nearly yearlong. x 24
pools. filling of pools.
15 Aquatic Abundant growth moss-like, dark green 1 Common. Algae forms in low velocity and 2 Present but spotty, mostly in backwater. 3 Penenial types scarce or absent. Yellow-
Vegetation perennial. In swift water, too. pool areas. Moss here, too. Seasonal algae growth makes rocks slick. green, short term bloom may be present. q
X
Excellent Total =I n
Good Total =I d
Fair Total = 36
Stream Type Al A2 A3 A4 AS A6 81 82 83 B4 B5 86 C1 C2 C3 C4 C5 C6 D3 D4 D5 D6
Good (Stable) 38-43 38-43 54-90 60-95 60-95 50-80 38-45 38-45 40-60 40-64 48-68 40-60 38-50 38-50 60-85 70-90 70-90 60-85 85-107 85-107 85-107 67-98
Fair (Mod. unstable 44-47 44-47 91-129 96-132 96-142 81.110 46-58 46-58 61-78 65-84 69-88 61-78 51-61 51-61 86-105 91-110 91-110 86-105 108-132 108-132 108-132 99-125
Poor Unstable 48+ 48+ 130+ 133+ 143+ 111+ 59+ 59+ 7g+ g5+ gg+ 79+ 62+ 62+ 106+ 111+ 111+ 106+ 133+ 133+ 133+ 126+
Stream T e DA3 DA4 DA5 DA6 E3 E4 ES E6 F1 F2 F3 F4 F5 F6 G1 G2 G3 G4 GS G6
Good (Stable) 40.63 40-63 40-63 40-63 40-63 50-75 50-75 40-63 60-85 60-85 85-110 85-110 90-115 80-95 40-60 40-60 85-107 85-107 90-112 85-107
Fair (Mod. unstable 64-86 64-86 64-86 64-86 64-86 76-96 76-96 64-86 86-105 86-105 111-125 111-125 116-130 96-110 61-78 61-78 108-120 108-120 113-125 108-120
Poor Unstable 87+ 87+ g7+ 87+ 87+ 97+ g7+ 87+ 106+ 106+ 126+ 126+ 131+ 111+ 7g+ 7g+ 121+ 121+ 126+ 121+
Poor Total = 99
Grand Total = 139
Stream Type =G4C
~ Modified Channel ~
~ Stability Rating = ~
j Poor (unstable) j

Bank Erosion Hazard Index
site Ostin Creek, Arledge Site
Survey Crew Lenk
Category Bank Ht
Ratio
(ft/ft) Root Depth
Ratio
(%) Root
Density
(%) Bank
Angle
(degrees) Surface
Protection
(%) Total
Index
Very Low Value 1.0 - 1.1 100 - 80 100 - 80 0 - 20 100 - 90
Index 1-Z 1-2 1-2 1-2 1-2 <10
Low Value 1.1- 1.2 80 - 55 80 - 55 20 - 60 90 - 50
Index 2-4 2-4 2-4 2-4 2-4 10-20
Moderate Value 1.2 - 1.5 55 - 30 55 - 30 60 - 80 50 - 30
Index 4-6 4-6 4-6 4-6 4-6 20-30
High Value 1.5 - 2.0 30 - 15 30 - 15 80 - 90 30 -15
Index 6-8 6-8 6-8 6-8 6=8 30-40
Very Value 2.0-2.8 15-5 15-5 90-120 15-5
High Index 8=9 8-9 8-9 8-9 8-9 40-45
Extreme .Value > 2.8 < 5 < 5 > 120 < 5
Index 10 10 10 10 10 > 45
Field Value 3.0 ?0 50 Z0~ ,-15
Measure Index 10 7 5 5- - b "33
Total Field Index 3 ~''
Numerical Adjustments +~ for sand °%
Bedrock: BEHI Very Low
Boulders: BEHI Low
Cobble: Decrease by one category if gravel/sand less than 50%
Gravel: Adjust Index up 5 - 10 points depending on sand %
Sand: Adjust Index up 10 points
Silt/Clay: No Adjustment
Stratification: Adjusi: Index up 5 - 10 points depending on position of unstable layers in
relation to bankfull stage
Date 12-6-06
Adjusted BEHI ~~

o+
2+00
4+00
Layout Scaler
1 inch = 200 feet
6+00
8+00
Flog plredion
r~
12+00
10+00
TFgI•eg Location
Layout

A~
O/n
14+00 16+00 P~r,~
18+00
18+96
510
+~
a,
~ 505
0
+~
° 500
_v
W
N
495
d
v
490
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 ]0+00 I1+00 12+DO 13+00 14+00 15+00 16+00 17+00 18+00 18+96
Longitudinal Profile
Profile Scale
Horizontal Scales 1 inch = 200 feet
Vertical Scales 1 inch = 10 feet
N I N R I N H Y R Y
50 COLLEGE STREET, ASHEVll.LE, NC 28801
TEL.[phone] EAC.828.281.3351
www.altmnontenvuonmental.com
DRAWN BY: PAUL DOW
PROJECT MANAGER: STU RYMAN SCALE AS NOTED
CLIENT: POLK COUNTY
DATE DESCRIPTION BY CHK APV DATE: 1/09107
LAYOUT & FIGURE
LONGITUDINAL PROFILE
OSTIN CREEK
ARLEDGE PROPERTY .
POLK COUNTY, NORTH CAROLINA
FILE PATH: P:IPOLK SWCD NRC5IPOLK DWR PROJECTS 02-OB 1ARLEDGE SITEIFIGURE51 PROFILESBX-SECT.DWG

River Left River Right
v 505 __ ............._ _ ...__......._ _.._...._ ............_..__ .......__....._....................... _ _.._....._ _ _...._
a, Area at Flood :Prone Area.
a- Bankfull Elevation ~ -~
.,
~ 500 ..._ _ _....... 0 _.._., „'' ..~.. _~.. ~,.,,.'._ . .
o _......._ ...........................................................__ _ _. ; 0 5 5 _. _<..
+' +~
d d
,...
o>, .495 _..._ _..... _....... _v 50 _........_.. _._.... _ ......
~' Bankfull Elevation Top of Low Bank 0
w w Area at
v v Top of Low Bank-
Bankfull Eleva
490 __. _._... _. _ .: _ >
_.. .
-- _.
d 0+00 0+10 0+20 0+30 0+40 0+50 0+56 0 0+00 0+10 0+20 0+30
v ~
~ ~
Reference Cross-Section A Ir~paire~ Pool C
3 Cross-Section 3
River Left River Right
510 _ ..... _ .._ .._ .._ _ .. _ ........_ ....___ _...... .
v
~ Area at Bankfull Elevatio Top of iLow Bank
~` 505 _
0
a 500 __ _ - __.: - _..
v loocl Prone Area
w
495 __.. _.. _ _..
°i Bankfull Elevation
d
490 ___. _.. _._...
v _...........__..._..._ _..__..._..........._..___......._ .................._.......................
~ 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70
0+72
Ir~paire~ Rif f ~e B
Cross-Section 3
AI.TAMONT ENVIRONMENfAI,, INC.
t ~•,
SD COLLEGE STREET, AS»EVQ,LE, NC 28801
TEL.[phone] Fnc.828.281.33S1
www. altamon tenvvonmental. c om
DRAWN BY: PAUL DOW
PROJECT MANAGER: STU RYMAN SCALE (FEET)
CLIENT: FOLK COUNTY o 5
DATE DESCRIPTION BY CHK APU DATE: I/09107
FIGURE
CROSS-SECTIONS
OSTIN CREEK
ARLEDGE PROPERTY
FOLK COUNTY, NORTH CAROLINA
~o
~ FILE PATH: P:IPOLK SWCD NRCS IPOLK DWR PROJECTS 02-081ARLEOGE SITEIFIGURESI PROFILES&A-SECT.OWG

PHOTOGRAPHS & DESCRIPTIONS
DWR PROJECT 03-ARLEDGE PROPERTY,
OSTIN CREEK, POLK CONTY, NC
r
_~ ~/~
- .~,-
~- ~,
View north, downstream of 15 foot vertical eroding bank near downstream extent of project area.
P:\Polk SWCD NRCS\Polk DWR projects 02-08\Arledge Site-DWR-03\photos for Level IlLdoc

Vie«~-~~~!??~~~"~t <~l~same bank as above, looking upstream from the downstream extent of project.
~~ s~..~_

rte---~--:-
~~
~`.~p,
P:\Polk SWCD NRCS\Polk DWR projects 02-08\Arledge Site-DWR-03\photos for Level IILdoc

View northeast of former livestock crossing area in foreground, mid-channel bar in center, poor riparian vegetation on
View southeast looking upstream of impaired streambank, property owners attempt to stabilize with brush and multiple
mid channel bars in background.
P:\Polk SWCD NRCS\Polk DWR projects 02-08Wrledge Site-DWR-03\photos for Level III.doc

View east, of
field of Kudzu.
P:\Polk SWCD NRCS\Polk DWR projects 02-08\Arledge Site-DWR-03\photos for Level IILdoc
View southwest of three foot high vertical streambank adjacent to Kudzu field.

ATTACHMENT B
Illustrations of Typical Structure Design

12" - 18"
Step 1 -Prepare Fascine Bundles: Cigar-shaped Bundles Of Live,
Rootable Brush And Branches With Butts Alternating, 6 To 8-inch
Diameters, Tied 12 To 18 Inches On Center
Backfill
2/3 Fascine
Diameter \
\\ . \ \
\\\ \
Step 2 - Dig Trench (2/3 Fascine Step 3 -Place Bundles In Trench.
Diameter In Depth) Backfill And Tamp, Leave
Top Exposed
3" Above Bundle \
\ ~\
Step 4 -Cover Slope With Matting, Step 5 -Add Stakes Below Bundles
If Needed, Stake On
2 - 4' Cuttings.
Construction Note: Installation Begins At The Bottom
Of The Slope And Proceeds Upslope
Following Step 1 Through Step 5
xNote~t Adapted From
Fascines may be totally Maryland's Waterway
buried NOT TO SCALE onstruction Guidelines
FASCINE SCHEMATIC
N I N R I N H Y Y
SO COLLEGE STREET, ASHEVILLE, NC 28801
TEL.[phone] FAC.828.281.3351
www.altamon[cnvironmental.com DWR-03-OSTIN CREEK /

ARLEDGE PROPERTY

DRAWN BY: JOEL LENK
PROJECT MANAGER: STU RYMAN

CLIENT: POLK CO. SWCD
souRCE: rNE vIRGBJIA STREAM RESroRAnoN
8 STABILIZATION BEST MANAGEMENT
PRACTICES GUIDE, 2004 POLK COUNTY, NORTH CAROLINA
DATE: 01-25-07 P:\PO~K SWCD NRCS \PO~K DWR Peaecrs 02-08 \AaIEDGE SirE-DWR-03 \FlGURES\FACwe Flc.owc

Grade Streambank
to a Stable Slope
~_---

Qcf Elevation / ,~~~;~~~, Stable Cut
Slope
- Bracing Boulder
,~ ~ ~ ~ a
Extend
Bench
0 0 1-2 Feet
,,•
Past
Footer
Stream Bed Invert
Log
Top Of Footer Log At
Or Below Stream Invert
SECTION Root Wad and Footer Log
Extends To
Max. Scour Depth
. ~ Footer Log
Flow
b Root Fan
Trunk
Root Wads Oriented \
Perpendicular To
Flow Direction °

Id
Construction Note: Bracing
A Brace Log Can Be Used Boulders
For Additional Stability /
And Should Be Pinned To (~~ ~
Adjacent Rootwads
,\
PLAN
Section & Plan Views Adapted
NOT TO SCALE From Rosgen (1999)
• ~
~
~ ROOTWAD SCHEMATIC
_
__
N G I N E E R I N G H Y D R O G E O L O G Y~
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL.[phone] Fnc.828.281.3351
DWR-03-OSTIN CREEK /
www.altamontenv ironmentaLcom
ARLEDGE PROPERTY
DRAWN BY: JOEL LENK POLK COUNTY, NORTH CAROLINA
PROJECT MANAGER: STU RYMAN
SWCD
CLIENT: POLK CO souRCE: rNE vlRCwIA srREAM RESroRAnoN
9 STABILIZATION BEST MANAGEMENT
.
DATE: OI-25-07 PRACTICES GUIDE, 2004
P:\POLK SWCD NRCS \POLK DWR PROdeci 02-08 \Aa~eoce Sire-DWR-03 \RCUaes\ROOrwno Fic.owc

Structure spans 1 /2 to 2/3 of stream width.
Flow
Note:
-Rocks in vane are not
spaced.
~,s; i,,
Bankfull Stage
F
I
Slope and
Vegetate Banks
Bankfull
\\ -_ ~ Bench
\\-
/1_ ~i
.Legend eed ~
,~ eleven
~a~r Rodt
~ ~ Vegetation
~.~~ Footer Rodt
NOT TO SCALE
NGtNEERiNC do W YDROGEOLOGY
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL.[phone] FAC.828.281.3351
www.altamontenvironmental.com
DRAWN BY: JOEL LENK souRCe: NoRrH caROUNa
PROJECT MANAGER: STU RYMAN srRean ResroRanoN
CLIENT: PCSWCD uNSrirure
DATE: OI-25-07
PROFILE
CROSS-SECTION
SINGLE ROCK VANE
ILLUSTRATION
DWR-03-OSTIN CREEK / ARLEDGE PROPERTY
POLK COUNTY, NORTH CAROLINA
P: \PaK SWCD NRCS\Pacn DWR PROJECTS 02-08\lw~oce Sire-DWR-03\FlS~ees\Sir+uciwES luisreanaws.owG '

-Rocks in "J" section are
spaced ~2 rock width.
-Use of geotextile
upstream of logs
is recommended
F
~ Flow
Y Y2 of Bottom Width
,•
NI
PROFILE
~~~
L_- O~
Log
~ Diameter
14"-36"
PLAN sioPa and
Vegetate Banks
Rankfi ip
For logs Q4" diameter, cable 3 logs
(10"-12") on ends using Yz" cable.
Bottom two logs should be below the
stream bed.
NOT TO SCALE
• 1
N G i N E E R I N G H Y D R O G E p L O G Y
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL.[phone] FAC.828.281.3351
www.altamontendvonmcntal.com
DRAWN BY: JOEL LENK
PROJECT MANAGER: STU RYMAN SOURCE: NORTH CAROLINA
CLIENT: PCSWCD STREAM RESTORATION
DATE: OI-25-07 INSTITUTE
LOG J-HOOK
ILLUSTRATION
DWR-03-OSTIN CREEK / ARLEDGE PROPERTY
POLK COUNTY, NORTH CAROLINA
P: \Part SWCD NRCS\PCUt DWR rROJECrs 02-OB\GRIEDGE Slre-DWR-03\FIGUFES\Srmxrw[s luisrRnna+s.owc I
CROSS-SECTION

Structure spans 1/2 to 2/3 of stream width.
/FLOW
s
I ~=~
-r~r
r
~. ~r~rrl
~~~
~ >'
~ l,,/ ~
!~
~~
PLAN
F
Notes:
-Rocks in vane are not
spaced.
-Rocks in "J"section are
spaced 1/2 rock width.
PROFILE
Slope and
Vegetate Banks
BankfuN
~ Bench
-~-_
%1\~1
Legend ~-~'''~' ...Bed
~Jl Els _ ~
Header Rode .Tree \`\~~\\\ \\\:
Footer Rods ~ Vegetation
NOT TO SCALE
~Gi N_~ ~RtNG & ~H YDROGE OI.OG Y
SO COLLEGE STREET, ASIIEVILLE, NC 28801
TEL.[phone] FAC.828.281.3351
www.altamontenvironmental.com
DRAWN BY: JOEL LENK
PROJECT MANAGER: STU RYMAN SOURCE: NORTH CAROLINA
CLIENT: PCSWCD STREAM RESTORATION
DATE: OI-25-07 wsnrurE
CROSS-SECTION
ROCK J-HOOK
ILLUSTRATION
DWR-03-OSTIN CREEK / ARLEDGE PROPERTY
POLK COUNTY, NORTH CAROLINA
P: \POEx SWLD NRLS\POLX DWR rROJEtrs 02-OB\ARIEDGE SirE-DWR-03\FIGURE$\STm1CTUtES ILLISIgAiILM.DWG I

~`
~~ankfull Stage ~ )
4 - 15% -innerBenn
Flow -~ ~~
PROFILE
Note: Use of geotextile
material on upstream
side of logs is strongly
recommended
FLOW
Slope and
Vegetate Banks
Bankfull
Legend
~ ~ ~- ~k aQ r~aer ~
``' // Footer
NOT TO SCALE
N G IN E E R I N G ~Y.t)-R-0 G E O L O G Y
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL.[phone] Fnc.828.281.3351
www.altamontenvironmental.com
DRAWN BY: JOEL LENK souRCE: NoRTrI cAROUNA
PROJECT MANAGER: STU RYMAN
CLIENT: PCSWCD STREAM RESTORATION
DATE: INSTITUTE
LOG VANE
ILLUSTRATION
DWR-03-OSTIN CREEK / ARLEDGE PROPERTY
POLK COUNTY, NORTH CAROLINA
P' \PaR SWCD NRCS\POIA DWR PaO~ECrs 02-08\PALE~GE SITE-DWR-03\FIGURES\STm1CTWE$ ILLISiRATIgA.OWG
CROSS-SECTION

ATTACHMENT C
Trout Buffer Waiver Request and
Shear Stress Calculations and Figures

~ ' / ~ ~ ~
E N G C N E E R I N G° & H Y D R O G E O L O G Y
50 COLLEGE STREET, ASHEVILLE, NC 28801
TEL. [phone] FAC.828.281.3351
www. altamontenvironmental. com
January 25, 2007
Mr. Gray Hauser
Division of Land Resources
1612 Mail Service Center
Raleigh, NC 27699-1612
Subject: Polk County, DWR -03-Ostin Creek / Arledge Family Properties Streambank
Stabilization
Dear Mr. Hauser:
With this letter Altamont Environmental, Inc. (Altamont) requests a Trout Buffer Waiver for the above
referenced project. The project is being completed by the Polk County Soil and Water Conservation
Board using grant monies provided by the North Carolina Water Resources Department. The project is
being implemented to stabilize significantly impaired and rapidly eroding streatnbanks that were
damaged by tropical storms in 2004 and subsequent high flow events. An access agreement for the
Arledge family properties authorizing Altamont to make this request is attached. Specifically the last
line of the agreement (Section 10) authorizes Altamont, to sign and execute all necessary permits and
coordinate communications with the appropriate regulatory agencies.
The approximate disturbed area for the Ostin Creek project will be no more than0.90 acres. Ostin Creek
is located in the Broad River basin and is classified as "C, Tr" waters throughout the project area by the
North Carolina Department of Environment and Natural Resources. The North Carolina Wildlife
Resources Commission classifies Ostin Creek as "Undesignated Waters". The project reach of the
stream is approximately 1,900 feet in length. Approximately 1,600 linear feet of Streambank is planned
to be stabilized. The balance of the project length will not be disturbed.
We have enclosed a site location map (Figure 1) and an aerial map (Figure 2) depicting the limits of
proposed disturbed area for the site. The total disturbed area exceeds the permitting threshold of 100
contiguous feet of disturbed riparian area in trout waters. For this reason we are requesting a Trout
Buffer Waiver. We do not anticipate the need for a formal Erosion and Sediment Control plan in order to
proceed with bank stabilization on this site because we do not anticipate greater than one acre of total
disturbance.
The project will utilize live fascines, coir matting, and large angular rock to stabilize eroding steambanks
in the permitted reach. Typical construction details for bank stabilization work applied for in a Pre-
construction Notification requesting 404 and 401 permits are attached for reference.
Calculations used to estimate shear stress at elevations above the channel thalweg (i.e., deepest point) are
included along with a table listing allowable shear stresses for materials planned for use in the project.
Readily available hydrologic data does not exist for Ostin Creek. For this reason Altamont used a
conservative approach to estimating shear stress by calculating shear stress for elevations at intervals
above the channel thalweg to the top of the low bank. Shear stresses were calculated at a measured cross
section (Figure 3), for both straight and sinuous channels. Shear stress design calculations are attached.
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Ar1edgeTrout WaiverRequest Letter-1-18-2007.doc

Mr. Gray Hauser
January 25, 2007
Page 2 of 2
When calculating shear stress for the sinuous channel, the tightest bend in the stream within the project
reach was measured and a Radius of Curvature was calculated from those measurements. The radius of
curvature is shown on Figure 2. The measured cross section shown on Figure 3 is within the radius of
curvature. This Radius of Curvature. value was then used to predict the shear stress at each elevation (1,
2, 3, 4, 5, 6, and 7.2 feet) for the sinuous channel flow. As shown by the calculations, the maximum
estimated shear. stresses for the sinuous channel at 6 feet and 7.2 feet above the channel thalweg is 3.3
and 4.2 pounds per square foot (lb/sq ft), respectively, which exceeds the permissible shear stress for
some of the specified materials.
Specified permissible shear stresses for the proposed materials are as follows:
• live fascines - 1.25 - 3.101b/sq ft
• coir roll -and 3 - 5 lb/sq ft
• large angular rock - 10.1 lb/sq ft
With the exception of the two highest depth conditions at the most sinuous point in the project reach, the
estimated shear stress does not exceed the literature values of permissible shear stress for the materials
specified.
The Mean Depth at Bankfull (Db~), as measured by Altamont in a riffle cross-section on Ostin Creek,
was 1.49 feet above the channel thalweg. The Db~ was also estimated using the North Carolina Piedmont
Regional Curve for Drainage Area (square miles) versus Depth (feet) found in the Journal of the
American Water Resources Association, Yol. 38, No.3, and sourced from the Stream Restoration A
Natural Channel Design Handbook's translation to English measurements. The regional curve analysis
determined a Db~ of approximately 2.6 feet. Using the more conservative of the two estimate, for Db~
(2.6 feet), this flow can be expected to occur, on average once every 1.5 years (Rosgen stream-
classification system (Rosgen 1996)). A Db~ of 2.6 feet is 3.4 feet lower than the lowest elevation where
the calculated shear stress exceeded the permissible shear stress for some materials.
The contractor used on this site will be required to utilize standard erosion control measures to minimize
environmental impacts related to land disturbing activities. Work within the buffer will be completed
using proper construction sequencing to minimize. the production of sediment and other pollutants. Each
segment of work undertaken will be stabilized at the end of each workday using erosion control cover
and temporary seeding. Equipment staging areas will be situated more than 25 feet from the top of the
streambank. All materials will be on hand prior to beginning construction. Work will be done in
accordance with the 404 and 401 permits issued for the project.
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Ar1edgeTrout WaiverRequest Letter-1-18-2007.doc

Mr. Gray Hauser
January 25, 2007
Page 2 of 2
The Polk County Soil and Water Conservation District and Altamont appreciate your assistance with this
project. If you would like additional information, please contact the undersigned.
Sincerely,
Chri opher F. Gilbert, P.E.
r
r
Jo D. Lenk, P.G.
Attachments: Access Agreement/Agent Authorization Letter
Figure 1. Vicinity Map
Figure 2. Site Plan and Limits of Disturbed Area
Shear Stress Design Calculations
Figure 3. Cross Section for Shear Stress Calculations
cc: Sandra Reid -Polk County District Administrative
Gerald Harbison -Polk County District Conservation Officer NRCS
Mel Nevils -Chief, Land Quality Section
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03\ArledgeTrout WaiverRequest Letter-1-18-2007.doc

ACCESS AGREEMENT
This Access Agreement is made between Polk County Soil and Water Conservation
District Supervisor Board (SWCD) and:
-Streambank Stabilization -Native plant Re-vegatation
-Debris Removal -Exotic/Invasive plant removal
SWCD and the Property Owner agree:
1. Property owner grants permission to SWCD and' its contractors and agents to
enter upon their land for the purpose of assessing and repairing the flood damage
caused by Hurricanes Frances and Ivan. Additionally, this agreement includes the
right of ingress and egress on the land for the purpose of maintaining the
emergency works for the period of one year from the date of completion.
2. Property owner grants permission to SWCD and its contractors and agent to
conduct stream stabilization measures, which may include debris removal, stream
bank stabilization using rocks, wood, and/or, mulching and seeding, and/or
channel relocation.
3. SWCD agrees to comply with Iocai, state, and federal laws applicable to the work,
and further agrees to exercise due care and caution in the performance of all work
on the Property.
4. This Agreement constitutes the entire understanding between the parties. All
prior agreements or understandings, whether oral or written, are superseded. This
Agreement may be amended only by a written document duly executed by the
parties.
5. The proposed measures are intended to repair flood damage to the stream and to
return affected areas to pre-flood conditions. Repair and/or improvements to
structures are not part of this project. Damaged bridges, driveways, and eroded
fields are not addressed by measures. SWCD and its contractors will strive to
minimize impacts to adjacent properties. However, some impact may be
unavoidable. The Property owner releases SWCD and its contractors from
liability for any damage incurred as result of this work.
6. This agreement does not provide confirmation that the subject site is eligible for
Emergency Funds, nor does it encumber funds for any repair work at this site.
7. Property owner agrees not to remove or modify construction repairs, including
vegetation, for one year from the date of completion.
The SWCD is requesting access to the property for the purpose of assessing and repairing
damage to the streambank, stream channel, and floodplain that was caused by hurricanes
Frances and Ivan and more recent storms. The repair work will include some or all of the
following elements:

8. SWCD will discuss the draft design with the Property Owner prior to submittal
for permitting.
9. Property Owner agrees to reimburse SWCD for all costs. associated with the
design if the property owner decides to terminate this agreement after work has
begun.
10. The Polk County Soil and Water conservation District and Polk County property
owners hereby authorize Altamont Environmental Inc. (Agent/Consultant) to sign
and execute all necessary permits and coordinate communications with the
appropriate regulatory agencies.
Polk County Soil and Water Conservation District
~ ~`J ~~~~
By: ~~ ~r~ ~-~r~ ~ Jy ~ c~
Date: 1 ~-~G~ `1~~.~
SWCD or Representative
By:
Date:
Property Owner
By:
Date: ~^ ~ - L ~ ~ tl C~

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SOURCE•• USGS MILL SPRING QUADRANGLE ' \ t _ '- :` •'
124,000 SCALE, 1982, REVISED 1990 `, 1, 7 I - ~ ~ ~ ~~ ! - 7 .^
VICINITY MAP FIGURE
E N G I N E E R I N G & H Y D R O C E O l O C Y
50 COLLEGE STREET, ASHEVIl.LE, NC 28801
TEL [phone] FAC 828.281.3351
www. alta~nontem~ironmental.com
DRAWN BY: JOEL LENK SCALE (FEET)
PROJECT MANAGER' STU RYMAN
GLIFNT: PCSWCD 1500 o isoo
DATE: OI-25-07 I
DWR-03-OSTIN CREEK/
ARLEDGE PROPERTY
POLK COUNTY, NORTH CAROLINA
3000
- P:\POL1( SWCD NRCS\POLn PROJECTS OZ-06\ARLEDGE SITE-DWR-03\FIGLRES\FIGl1RE.OWG

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N I N R I N H Y R Y
50 COLLEGE STREET, ASHEVILLE, NC 28801
iEL.828.2813350 Fncszs.zs133s' DWR-03-OSTIN CREEK /
www. altainoutenvironmental.com
ARLEDGE PROPERTY
DRAWN BY: PAUL DOW SCALE (FEET) POLK COUNTY
PROJECT MANAGER: STU RYMAN ,NORTH CAROLINA
CLIENT: PCSWCD 50 0 50 goo
DATE: OI-25-07 FILE PATH: P:\POLK SWCD NRCS\PoLrc DWR PROJECrs 02-OS\AR~eocE Site-DWR-03\FIGURFS\ Fi;.:-~ ii. ~:ve,.r r~ _ ~. .,.,

Ostia Creek
Arledge Property
Polk County, NC
Streambank Stability Calculations
Find shear stress with z = yRH S
where: y = 62.41b/ft3 (density of water)
RH =hydraulic radius (ft)
S =average stream slope (ft/ft)
Calculate shear stress for depths up to the top of bank. Using channel dimensions from a
cross-section measured by Altamont personnel in the field with the proposed 3:1 slope on
the streambank (see attached cross-section), calculate hydraulic radius for the following
depth conditions (*Note: depth measured from the channel thalweg):
• 1 ft;
• 2 ft;
• 3 ft;
• 4 ft;
• 5 ft;
• 6 ft and;
• 7.2 ft (elevation at top of low bank)
Set S = 8.08 (elevation difference, head of first riffle to head of last riffle) / 1,573 (length
of thalweg) = 0.005 ft/ft (based on measurements made by Altamont in the field)
Calculate shear stresses for the straight channel.
__ Area
RH Wetted Perimeter (WP)
Straight
Proposed Cross- Wetted Hydraulic Top Width Channel Shear
Elevation (ft) Sectional Area (sf) Perimeter (ft) Radius (ft) of Channel Stress (lb/ftz)
1 14.30 21.90 0.65 21.69 0.2
2 41.04 32.31 1.27 31.87 0.4
3 77.47 40.55 1.91 39.82 0.6
4 120.14 47.63 2.52 46.56 0.8
5 171.70 56.34 3.05 55.00 1.0
6 229.86 62.98 3.65 61.33 1.1
7.2 310.95 71.24 4.36 69.20 1.4
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge Shear stress calculations.doc Page 1 of 2

7.2 feet is the elevation at top of existing low bank
Db~=2.60=Mean Depth at Bankfull as sourced from the Journal of the American Water
Resources Association, Vol. 38, No. 3, and sourced from the Stream Restoration A
Natural Channel Design Handbook's translation to English measurements.
Permissible shear stress for large angular rock at toe of slope =10.1 lb/ft2 (see attached
Table)
Permissible shear stress for coir matting on streambank = 3 - S lb/ftz (see attached Table)
Permissible shear stress for live fascine on streambank =1.25-3.10 lb/ftz (see attached
Table)
Adiust calculated shear stress values to account for channel sinuosity.
(Equation 10 of "Stability Thresholds for Stream Restoration Materials - ERDC TN-
EMRRP-SR-29" prepared by Craig Fischenich of the USAF Research and Development
Center, Environmental Laboratory, 3909 Halls Ferry Rd, Vicksburg, MS 39180, May
2001)
-o.s
z~,~ = 2.652
Rc =Radius of Curvature
Rc = 50 feet (see Figure 2)
W =Top Width of Channel
W =top widths of channel at depths of 1,2,3,4,5,6,and 7.2 feet indicated on the table
above.
Max Shear Stress for
Elevation Straight Channel Sinuous Channel
(ft) Shear Stress (]b/ft2) (lb/ft2)
1 0.2 0.4
2 0.4 0.8
3 0.6 1.4
4 0.8 2.0
5 1.0 2.6
6 1.1 3.3
7.2 1.4 4.2
Permissible shear stress for large angular rock at toe of slope =10.1 lb/ft2 (see attached
Table)
Permissible shear stress for coir matting on streambank = 3 - S lb/ft2 (see attached Table)
Permissible shear stress for live fascine on streambank = 1.25-3.10 lb/ft2 (see attached
Table)
P:~Polk SWCD NRCS~PoIk DWR projects 02-08~Arledge Site-DWR-03~Arledge Shear stress calculations.doc Page 2 of 2

~~
Soils Fine colloidal sand 0.02 - 0.03 1.5 A
-. - Sandy loam (noncolloidal) 0.03 - 0.04 1.75 A
- Alluvial sift (noncolloidal) 0.045 - 0.05 2 A
Silty loam (noncolloidal) ~ 0.045 - 0.05 1.75 - 2.25 A
Firm loam 0.075 2.5 A
Fine gravels 0.075 2.5 A
Stiff clay 0.26 3 - 4.5 A, F
Alluvial silt (colloidal) 0.26 3.75 A
Graded loam to cobbles 0.38 3.75 A
Graded silts to cobbles 0.43 4 A
Shales and hardpan 0.67 6 A
GravellCobble 1-in. 0.33 2.5 - 5 A
2-in. .0.67 3 - 6 A
6-in. 2.0 4 - 7.5 A
12-in. 4.0 5.5 - 12 A
Vegetation Class A turf 3.7 6 - 8 E, N
Class B turf 2.1 4 - 7 E, N
Class C turf 1.0 3.5 E, N
Long native grasses 1.2 - 1.7 4 - 6 G, H, L, N
Short native and bunch grass 0.7 - 0.95 , 3 - 4 G, H, L, N
Reed plantings 0.1-0.6 N/A E, N
Hardwood tree plantings 0.41-2.5 N/A E, N
Temporar~Degradable RECPs Jute net 0.45 1 - 2.5 E, H, M
Straw with net 1.5 - 1.65 1 - 3 E, H, M
Coconut fiber with net 2.25 3 - 4 E, M
Fiberglass roving 2.00 2.5 - 7 E, H, M
Non-Degradable RECPs Unvegetated 3.00 5 - 7 E, G, M
Partially established 4.0-6.0 7.5 - 15 E, G, M
Fully vegetated 8.00 8 - 21 F, L, M
R~ 6-in.d50 2.5 5-10 H
9-in.dso 3.8 7-11 H
12-in. d~ 5.1 10-13 H
18-in.d~ 7.6 12-16 H
24 - in. d~ 10.1 14 - 18 E
Soii Bioengineering Wattles 0.2 = 1.0 3 C, I, J, N
Reed fascine 0.6-1.25 5 E
~j Coir roll 3 - 5 8 E, M, N
Vegetated coir mat 4 - 8 9.5 E, M, N
Live brush mattress (initial) 0.4 - 4.1 4 B, E, I
Live brush mattress (grown) 3.90-8.2 12 B, C, E, I, N
Brush layering (initial/grown) 0.4 - 6.25 12 E, I, N
-~ Live fascine 1.25-3.10 6 - 8 C, E, I, J
Live willow stakes 2.10-3.10 3 - 10 E, N, O
Hard Surfacing Gabions 10 14 - 19 D
Concrete 12.5 >18 H
Ranges of values generally reflect multiple sources of data or different testing conditions.
Q Chang, H.H. (1988). F. Julien, P.Y. (1995). K Sprague, C.J. ( 1999).
B. Florineth. (1982) G. Kouwen, N.; Li, R. M.; and Simons, D.B., (1980). L. Temple, D.M. ( 1980).
C. Gerstgraser, C. (1998). H. Norman, J. N. (1975). M. TXDOT (1999)
D: Goff, K. (1999): I. Schiechtl, H. M. and R. Stern. (1 996). N. Data from Author (2001)
E Gray, D.H., and Sotir, R.B. (1996). J. Schoklitsch, A (1937). O. USACE (1997).
ERDC TN-EMRRP SR 29
5
Table 2. Permissible Shear and Velocity for Selected Lining Materials'

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