20010990 Ver 1_Complete File_20010702

OF W ATF
\O? 9oG Michael F. Easley _
Governor
CO William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
July 16, 2001
Jackson County
DWQ Project No. 010990
SR 1170 (Rogers Road)
APPROVAL of 401 Water Quality Certification with Additional Conditions
Mr. C.R. Styles, P.E., District Engineer
NCDOT
P.O. Box 250
Bryson City, NC 28713
Dear Mr. Styles:
You have our approval, in accordance with the attached conditions and those listed below, to impact 10
linear feet of an unnamed tributary to Tuckasegee River in order improve SR 1170 (Rogers Road) in
Jackson County. The project should be constructed in accordance with your application dated 19 June
2001. After reviewing your application, we have decided that this fill is covered by General Water
Quality Certification No. 3289 corresponding to the U.S. Army Corps of Engineers Nationwide Permit
Number 14. In addition, you should acquire any other federal, state or local permits before you proceed
with your project including (but not limited to) Sediment and Erosion Control, Non-Discharge and Water
Supply Watershed regulations. This approval will expire with the accompanying 404 permit unless
otherwise specified in the Water Quality Certification.
This approval is valid solely for the purpose and design described in your application (unless modified
below). Should your project change, you must notify the DWQ and submit a new application. If the
property is sold, the new owner must be given a copy of this Certification and approval letter, and is
thereby responsible for complying with all the conditions. If total wetland fills for this project (now or in
the future) exceed one acre, or of total impacts to streams (now or in the future) exceed 150 linear feet,
compensatory mitigation may be required as described in 15A NCAC 2H .0506 (h) (6) and (7). For this
approval to be valid, you must follow the conditions listed in the attached certification and any additional
conditions listed below.
1. In-stream work and land disturbance within the 25-foot wide buffer zone are prohibited during the
trout spawning season of October 15 through April 15, or as otherwise determined by the North
Carolina Wildlife Resources Commission, to protect the egg and fry stages of trout from
sedimentation during construction.
2. Follow the stormwater management requirements specific to WS-III as described in 15A NCAC 2H
.215.
3. Sedimentation and Erosion Control Guidelines for Sensitive Watersheds (15A NCAC 4B .0024) must
be implemented prior to any ground-disturbing activities to minimize impacts to downstream aquatic
resources. Temporary or permanent herbaceous vegetation should be planted on all bare soil within 5
days of ground-disturbing activities to provide long term erosion control.
4. The culvert required for this project shall be installed in such a manner that the original stream profile
is not altered (i.e. the depth of the channel should not be reduced by a widening of the streambed).
Existing stream dimensions are to be maintained above and below locations of culvert extensions.
5. All work shall be performed during low flow conditions.
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.us/ncwetlands/
Page 2 of 2
6. All mechanized equipment operated near surface waters should be regularly inspected and maintained
to prevent contamination of stream waters from fuels, lubricants, hydraulic fluids, or other toxic
materials.
7. The presence of equipment in the channels must be minimized. Under no circumstances should rock,
sand or other materials be dredged from the wetted stream channel under authorization of this permit,
except in the immediate vicinity of the culverts.
8. Mowing of existing vegetated buffers is strongly discouraged, so that they may be utilized for storm
water sheet flow.
9. Use of rip-rap for bank stabilization is to be minimized; rather, native vegetation is to be planted
when practical. If necessary, rip-rap should be limited to the stream bank below the high water mark,
and vegetation should be used for stabilization above high water.
10. Rock silt screens at culvert outlets should be removed at project completion.
Sincerely,
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory
hearing. You must act within 60 days of the date that you receive this letter. To ask for a
hearing, send a written petition which conforms to Chapter 150B of the North Carolina General
Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, N.C.
27699-6714. This certification and its conditions are final and binding unless you ask for a
hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water
Act. If you have any questions, please telephone Ms. Cynthia Van Der Wiele at 919.733.1786 or Mr.
Mike Parker of the Asheville Regional Office at 828.251-6452.
Attachment
T Stevens
cc: Wilmington District Corps of Engineers
Corps of Engineers Asheville Field Office
NCDWQ Asheville Regional Office
Central Files
File Copy
401 ISSUED 0 9 9 0 J61 2:
N •,A6
w? prr ??w
STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
MICHAEL F. EASLEY LYNDO TIPPETT
GOVERNOR SECRETARY
June 19, 2001
Jackson County
SR 1170
Mr. Steve Lund, NCDOT Coordinator
U. S. Army Corps of Engineers
Regulatory Branch
151 Patton Avenue, Room 208
Asheville, NC 28801-5006
Dear Mr. Lund:
The North Carolina Department of Transportation is proposing to grade, drain, base and
pave primarily along the existing roadway of SR 1170, Rogers Road in Jackson County. In
order to construct this project in accordance with our current secondary road standards, and
due to the replacement/extension of one pipe culvert in an unnamed tributary to the
Tuckasegee River (DEM Class WS III & B, TR), we are requesting authorization under Section
404 of the Clean Water Act.
I am sending a straight-line diagram with our proposed erosion control and construction
limits at various sites along this project. In addition, a typical section of the road, drawings for
the pipe replacement/extension in the unnamed tributary to the Tuckasegee River, general
notes and standards on erosion control measures, and a marked County Map are enclosed. We
propose to install the new culvert slightly below the existing stream bed elevation where
bedrock is not encountered to minimize impact to Wildlife habitat and allow the existing stream
gradient to remain as unchanged as physically possible.
The best management practices will be used to minimize and control sedimentation and
erosion on this project. The construction foreman will review all erosion control measures daily
to ensure sedimentation and erosion controls are being effectively controlled. If the planned
devices are not functioning as intended, they will immediately be replaced with better devices.
The silt fences and other erosion control devices will be in place prior to pipe installation and will
remain in place until the project is stabilized.
J
P.O. Box 250, Bryson City, NC 28713 Phone [phone] PAYMENT
RECEIVFD
Mr. Steve Lund
Page 2
June 19, 2001
By copy of this letter I am asking Mr. Owen Anderson, Habitat Coordinator Western
Mountain District, of the NCWRC to comment directly to you concerning the 404 Nationwide
permit request.
Also by copy of this letter, I am requesting authorization to proceed under Section 401 of
the Clear Water Act from Division of Water Quality. In addition, I am asking Mr. Anderson and
Mr. Ed Ingle, Area Roadside Environmental Engineer (NCDOT), to comment directly to me
concerning this permit request.
We would like to begin construction as soon as possible. If further information is
required, please advise. Your early review and c ideration will be appreciated.
Yours tr y,
C. R. tyle P. E.
District ngi eer
CRS:sd
atta.
cc: Mr. R. G. Watson, P. E., Division Engineer
Mr. Mark Davis, Division Environmental Officer
Mr. E. L. Ingle, Area Roadside Environmental Engineer
Mr. Owen Anderson, Habitat Coordinator W. Mtn. Dist., NCWRC
Mr. John Dorney, Water Quality Certification Unit, DWQ
P.O. Box 250, Bryson City, NC 28713 Phone [phone]
Office Use Only' 010 a a a Form Version April 2001
USACE Action ID No. DWQ No.
If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A" rather than
leaving the space blank.
1. Processing
1. Chec all of the approval(s) requested for this project:
Section 404 Permit
? Se tion 10 Permit
O1 Water Quality Certification
? Riparian or Watershed Buffer Rules
2. Nationwide, Regional or General Permit Number(s) Requested:
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 (see section VIII - Mitigation), check here: ?
II. Applicant Information
1. Owner/Applicant Information
Name: NCDOT DISTRICT ENGINEER C R Styles P E.
Mailing Address: P O Drawer 250, Bryson City NC 28713
Telephone Number: [phone] Fax Number:- ($28) 488-3518
E-mail Address:
2. Agent 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: N/A
Company Affiliation: N/A -
Mailing Address: N/A
Telephone Number: NIA - Fax Number:- N/A
E-mail Address: N/A -
Page 3 of 12
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 frill-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.
-5 R
1. Name of project: Z 117 0 h ?T?.t ?c_.sor? Co
2. T.I.P. Project Number (NCDOT Only):
3. Property Identification Number (Tax PIN): N/A
4. Location
County: -, Ck?,(, n Nearest Town: (<o ?J ?N Z-g- -
Subdivision name (include phase/lot number): N/A ,
Inc r, k'?
I)Aection? to site (include road numbers, landmarks, etc.): -Z77 I<- 1I 7 0
r f . ice- ,--7 T' .I. /' - I,
5. Site coordinates, if available (UTM or Lat/Long): N/A
(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.)
6. Describe the existing land use or condition of the site at the time of this application:
State maintained secondary road used to access viral woodland and/or residential property.
7. Property size (acres): ?. yC? ^^ 11 1 / (I
/Vi?lhr,JwC'd 7! ?i•T'OS 11 4o ?hC
8. Nearest body of water (stream/river/sound/ocean/lake)--T A. sQl
9. River Basin: -'nri `" VP at. ,'In
(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 tis/admin/maps/.)
Page 4 of 12
10. Describe the purpose of the proposed work: To widen and pave SR 1110 to meet current
standards,
NCDOT 11. List the type of equipment to be used to constrict the project: Track Hoes Bulldozers,
Dump trucks Back Hoes Manual Labor etc
12. Describe the land use in the vicinity of this project: Rural woodland Residential
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. A
V. Future Project Plans
Are any additional permit requests anticipated for this project in the future? If so, describe the
anticipated work, and provide justification for the exclusion of this work from the current
application: No additional permit requests are anticipated -
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
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.
Page 5 of 12
1. Wetland Impacts
Wetland Impact
Site Number
(indicate on map)
Type of Impact* Area of
Impact
(acres) Located within
100-year Floodplain**
(yes/no) Distance to
Nearest Stream
(linear feet)
Type of Wetland***

i
' I

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: mechanized clearing, grading, fill.
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.Qov,
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond.
Carolina Bay, bog, etc.)
List the total acreage (estimated) of existing wetlands on the property: N
Total area of wetland impact proposed: /V?".
2. Stream Impacts, including all intermittent and perennial streams
Stream Impact
Site Number
(indicate on map)
Type of Impact* Length of
Impact
(linear feet)
Stream Name** Average Width
of Stream
Before Impact Perennial or
Intermittent?
(please specify)

i
I

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-ra:,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss,'gai°
stabilization activities (cement wall, rip-rap, crib wall, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation :s
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 nearer:
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online a:
-.
www.usgs.gov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozonc.co
www.niapquest.co m, etc.).
Cumulative impacts (linear distance in feet) to all streams on site:
Page 6 of 12
3. Open Water Impacts, including Lakes, -Ponds, Estuaries, Sounds, Atlantic Ocean and any
other Water of the U.S.
Open Water Impact

Site Number
(indicate on map)

Type of Impact* Area of

Impact
(acres)
Name of Waterbody
(if applicable) Type of Waterbody
lake, d, estuary,
(lake, pond,
bay, ocean, etc.)

NI I/
N

rvravatinn dredvying
* List each impact separately and identity temporary impacu. unNaCLa 111?IUUc, vu? w
flooding, drainage, bulkheads, etc.
4. 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 F_? stream E] 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
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.
_ Impacts cannot be avoided Culverts must be extended in order to gain the necessary width
to construct SR1170 to current NCDOT standards All pipe replacements ??'tll be placed belo%\
the existing stream bed gradient so natural substrate can be re-established.
Page 7 of 12
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
ht p•//h2o enr state nc us/ncwetlands/stmigide,litml.
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
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
N/A
Page 8 of 12
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP) with the NCWRP's written agreement. Check the box indicating that
you would like to pay into the NCWRP. Please note that payment into the NCWRP must be
reviewed and approved before it can be used to satisfy mitigation requirements. Applicants
will be notified early in the review process by the 401/Wetlands Unit if payment into the
NCWRP is available as an option. For additional information regarding the application
process for the NCWRP, check the NCWRP website at hUa/ih2o enr state nc.us,;N%-rp'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 of Non-riparian wetland mitigation requested (acres): N/A
Amount of Coastal wetland mitigation requested (acres): N/A
IX. Environmental Documentation (DWQ Only)
Does the project involve an expenditure of public finds or the use of public (federal/state/local)
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] o review current thresholds for environmental documentation.
Yes ? No V
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 ? N/A
X. Proposed Impacts on Riparian and Watershed Buffers (DWQ Only)
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.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Neuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 213 .0250 (Randleman Rules and
Water Supply Buffer Require ents), or other (please identify )?
Yes El No if you answered "yes", provide the following information:
Page 9 of 12
Identify the square feet and acreage of impact to each zone of the riparian buffers. j1
mitigation is required calculate the required amount of mitigation by applying the
multipliers.
Zone* Impact
(square feet) Multiplier Required
Mitigation
1 N/A 3 N/A
2 N/A 1.5 N/A
Total N/A N/A
Lone t extenas out -iu feet perpenatcutar from near oanK of cnannei; /-one z extenas an
additional 20 feet from the edge of Zone I.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., D
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preserv,
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate inform;
identified within 15A NCAC 2B .0242 or.0260.
XI. Stormwater (DWQ Only)
Describe impervious acreage (both existing and proposed) versus total acreage on t
Discuss stormwater controls proposed in order to protect surface waters and v?
downstream from the property.
Existing impervious acreage = 13 Z Proposed impervious acreage = I. 5
Total acreage = `, `/0 Storm water will be routed to buffer areas or retention basins
where physically ically possible
XII. Sewage Disposal (DWQ Only)
Clearly detail the ultimate treatment methods and disposition (non-discharge or dischz
wastewater generated from the proposed project, or available capacity of the subject facili
XIII. Violations (DWQ Only)
Is this site in violation of DWQ Wetland Rules,(15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No IV
Is this an after-the-fact permit plication?
Yes ? No permit
Page 10 of 12
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 $pecies, accessibility problems, or other issues outside of the applicant's control).
CZ C? I? ?1
Applicant/Agent's Signatur Date
(Agent's signature is valid on if n authorizatio n letter from th e applicant is provided.)

US Army Corps Of Engineers Field Offices and County Coverage
Asheville Regulatory Field Office Alexander Cherokee Iredell Mitchell
US Army Corps of Engineers Avery
Buncombe Clay
Cleveland Jackson
Lincoln Polk
Rowan
151 Patton Avenue
Room 208 Burke Gaston Macon Rutherford
NC 28801-5006
Asheville Cabarrus Graham Madison Stanley
,
Telephone: [phone] Caldwell
Catawba Haywood
Henderson McDowell
Mecklenbur Swain
g Transylvania
Fax: [phone]
Raleigh Regulatory Field Office Alamance Durham Johnston Rockingham
US Army Corps Of Engineers Alleghany Edgecombe Lee Stokes
6508 Falls of the Neuse Road Ashe Franklin Nash Surry
Suite 120 Caswell Forsyth Northampton Vance
Raleigh, NC 27615 Chatham
Davidson Granville
Guilford Orange
Person Wake
Warren
Telephone: [phone] Davie Halifax Randolph Wilkes
Fax: [phone]
Washington Regulatory Field Office Beaufort Currituck Jones
US Army Corps Of Engineers Bertie Dare Lenoir
tin
M
Post Office Box 1000 Camden Gates ar
Washington, NC 27889-1000 Carteret* Green Pamlico
Telephone: [phone] Chowan Hertford Pasquotank
Fax: [phone] Craven Hyde Perquimans
Wilmington Regulatory Field Office Anson Duplin Onslow
US Army Corps Of Engineers Bladen
Brunswick Harnett
Hoke Pender
Richmond
Post Office Box 1890
Wilmington, NC 28402-1890 Carteret Montgomery Robeson
Telephone: [phone] Columbus Moore Sampson
Fax: [phone] Cumberland New Hanover Scotland
Pitt
Tyrrell
Washington
Wayne
Union
Watauga
Yancey
Wilson
Yadkin
*Croatan National Forest Only
Page 11 of 12
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TEMPORARY SILT FENCE:
A temporary silt fence is commonly used at the toe of a fill t section to prevent off-
site sedimentation. It is made of permeable filter fabric buried at
flow water f low-wed while
stretched and supported by steel posts. The silt fence reduces the
retaining the sediment. They may also be used to divert outlets. Silt fences need to be checked after each significant ra fenceto prot
s seal not bee
effectiveness. They must be maintained on a regular basis. Silt installed across streams, ditches, or waterways.
AREAS OF USE:
• At toe of fill sections where sediment runoff can be stored and contained
inside the project limits.
DESIGN CRITERIA:
M ateTJ al
Fabric
Steel posts length
Post spacing
With Wire
Type 3 Class
5 ft
10 ft.
Without Wire
A Type 3 Class B
5 ft.
6 ft. maximum
17
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SILT BASIN TYPE-B:

A silt basin type-B is a temporary basin built to collect sediment flowing through a
drainage way. The silt basin is built at the base of the ditch with its length being at
least 2 times the width of the basin. The type-B silt basin is generally built in
conjunction with temporary rock silt checks and other devices that control or slow
down water flow. This device must be.monitored closely and cleaned out on a
regular basis until grass is established along the ditch line and sedimentation is no
longer a problem.
AREAS OF USE:
• In conjunction with temporary rock silt checks and other devices used in
drainage ditches.
DESIGN CRITERIA:
• Width - variable
• Length - 2 times width
• Depth - 2 ft. minimum storage -
1800 cubic feet/acre (equals L x W x D)
23
March, 1992
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March, 1992
ROCK PIPE INLET PROTECTION TYPE-A:
o °
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A rock pipe inlet protection type-A is a horseshoe shf the structure. The type-ltt---in
sediment storage area around the outside perimeter o
rock pipe inlet protection shall be used at pipe inlets no larger than 36 inches in
diameter where it is receiving flow from several directions. The type-A rock pipe
inlet protection utilizes class-B stone lined with 4#5 or #57 stone to protect drainage
pipe structures by trapping sediment before it enters. They have a sediment storage
pit which is designed by the same procedures as a silt basin.
AREAS OF USE:
• At inlets to pipes no larger than 36 inches in diameter where it receives flow
from several directions.
• In areas where it can be cleaned and maintained on a regular basis.
DESIGN CRITERIA:
• Structural stone - class-B stone
• Sediment control stone - #5 or #57 stone
• Sediment storage area - 1800 cubic ft./acre
• Dam height - 3 ft. minimum
33 March, 1992
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ROCK SILT SCREEN:
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A
A rock silt screen is a low-level dam structure to be used in streams below culvert
sites. Rock silt screens shall be used to trap sediment transported by running water
and shall be placed in the stream below the construction site within the right-of-
way or easement boundary. The rock silt screen utilizes class B stone lined with #5
or #57 stone to produce a ripple-effect in the stream to settle the larger sediment
particles transported in the stream from the construction site. The trapped sediment
shall be cleaned out before the device is removed from the stream.
AREAS OF USE:
In live streams below construction sites where construction occurs in or
adjacent to the stream.
• In live streams below a culvert construction site.
• Where it can be cleaned before it is removed from stream.
DESIGN CRITERIA:
Structural stone - class B stone
Sediment control stone - # 5 or # 57 stone
Dam height - 1.5 ft. minimum and 3 ft. maximum ( shall not be higher than
1 ft. above normal flow of stream)
37 March, 1992
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