20020596 Ver 1_Complete File_20020417

10 020596
M SUTE v ., i
APR 1 7 2002
'?a.?.?' WETUNDS GROUP
WATER QUALITY SECTION
S'L'ATE car NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
MICHAEL F. EASLEY LYNDO TIPPETT
Govi.'RNOR SECRETARY
April 10, 2002
U. S. Army Corps of Engineers : Fw
Regulatory Branch
151 Patton Avenue, Room 208 Joel e / ?k w'
Asheville, NC 28801-5006
Attention: Mr. John Hendrix
NCDOT Coordinator
Subject: Proposed Construction of SR 1377(Mack Town Rd.)in Jackson Co.
State Project No. 6.962098T(DWQ Minor Permit Fee $200.00)
Subject:
Dear Mr. Hendrix:
The North Carolina Department of Transportation is proposing to grade, drain, base and
pave primarily along the existing roadway of SR 1377, Mack Town Rd. in Jackson County. In
order to construct this project in accordance with our current secondary road standards, and due
to the replacement/extension of two(2) pipe culverts of an unnamed tributary to Mack Town
Br.(DEM CLASS C), 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 culvert replacements/extensions in the unnamed tributary to Mack Town Br., general notes
and standards on erosion control measures, and a marked County Map are enclosed. We
propose to install the new culverts 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.
P.O. Box 250, Bryson City, NC 28713 Phone [phone]

Mr. John Hendrix
Page 2
April 10, 2002
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 consideration will be appreciated.
Yours truly, ??4J
/7' 5y ' /7 G
C. R. Styles, P. E.
District Engineer
DSE:se
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: Form Version April 2001
USACE Action ID No. DWQ No. 02 0 59.6
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. Check all of the approval(s) requested for this project:
® Section 404 Permit
R Section 10 Permit
® 401 Water Quality Certification
? Riparian or Watershed Buffer Rules
2. Nationwide, Regional or General Permit Number(s) Requested: 14
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
2.
1. Owner/Applicant Information
Name: NC DOT - DISTRICT ENGINEER: C. R. Styles, P. E.
Mailing Address: P. O. Drawer 250, Bryson City, NC 28713
Telephone Number: 1-828-488-2131 Fax Number: 1-828-488-3518
E-mail Address: [e-mail]
Agent Information (A signed and dated copy of the Agent Authorization
attached if the Agent has signatory authority for the owner/applicant.)
Name: N/A
Company Affiliation: N/A
Mailing Address: N/A
Telephone Number: N/A
E-mail Address: N/A
letter must be
Fax Number: N/A
Page 3 of 13
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.
1. Name of project: Widening of SR 1377, (Mack Town Road) in Jackson County.
2. T.I.P. Project Number (NCDOT Only): 6.962098T
3. Property Identification Number (Tax PIN):
4. Location
County: Jackson Nearest Town: Dillsboro/Sylva
Subdivision name (include phase/lot number):
Directions to site (include road numbers, landmarks, etc.):From Asheville take I-40 West and
exit off at exit 27 onto US 19-74 . Go approx. 21.0 miles and take exit 83,Dillsboro/Franklin
Exit, onto US 441 S. Go approx. 0.70 miles through one redlight and take right on SR 1377 .
Go approx.0.70 miles and take left on SR1377. Go 0.25 miles and take right on SR 1377.
This is the project. NOTE* These directions bring you in on the end of the project(STA.
95+00) Project is a through road.
Site coordinates, if available (UTM or Lat./Long): 35D 21' 9.27"N 83D 16' 40.66"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.)
6. Describe the existing land use or condition of the site at the time of this application:
Farmland and Forestland
7. Property size (acres): 3.65 NOTE* Only constructing 0+00-13+30 and 76+50-95+00
8. Nearest body of water (stream/river/sound/ocean/lake):Unnamed Trib. to Mack Town
Branch(DEM CLASS C).
9. River Basin: Little Tennessee
Page 4 of 13
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://l12o.enr.state.nc.us/admin/maps/.)
Describe the purpose of the proposed work: To widen and pave SR 1377 to meet current
NCDOT standards. This includes cutting and filling earthwork where needed, replacing old
drainage structures that are inadequate, and making the road safer by widening shoulders and
changing the road profile.
10. List the type of equipment to be used to construct the project:
Track Hoes, Back Hoes, Dump Trucks, Bulldozers, Manual Labor, etc.
11. Describe the land use in the vicinity of this project:
Rural woodland, some 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.
No prior permits have been applied for this project.
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
Page 5 of 13
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. Wetland Impacts
Weiland 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***
N/A N/A N/A N/A N/A N/A

* 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.fcma.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.)
List the total acreage (estimated) of existing wetlands on the property: 0
Total area of wetland impact proposed: 0
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)
1 Culvert extension 5' Unnamed Trib. to Mack
Town Branch 1' Perennial
2 Culvert replacement 20' Unnamed Trib to Mack
Town Branch Perennial

* 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 after, and net loss/gain),
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 intcrnet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.niapqucst.com, etc.).
Page 6 of 13
Cumulative impacts (linear distance in feet) to all streams on site: 25' '
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 Watble)
(if applicable) Type of Waterbody
(lake, pond, estuary, sound
bay, ocean, etc.)
N/A N/A N/A N/A N/A

* List each impact separately and identify temporary impacts. Impacts include, but arc not limited to: tdi, excavation, dredging,
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-I 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
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 SR 1377 to current NCDOT standards. All pipe replacements will be placed below
the existing stream bed gradient so natural substrate can be re-established.
Page 7 of 13
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
http://l12o.enr.state.nc.us/ncwetlands/stnngide.html.
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 13
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 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 of Non-riparian wetland mitigation requested (acres):-
Amount of Coastal wetland mitigation requested (acres): N/A
IX. Environmental Documentation (DWQ Only)
Does the project involve an expenditure of public funds or the use of public (federal/state/local)
land?
Yes ® No R
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
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 (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.
N/A
Page 9 of 13
XIII. Violations (DWQ Only)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes 0 No
Is this an after-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 Species, accessibility problems, or other issues outside of the applicant's control).

, e1 7 ? - y i0 -0 Z
Applicant/Agent's Sig ture Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
US Army Corps Of Engineers Field Offices and County Coverage
Asheville Regulatory Field Office Alexander Cherokee Iredell Mitchell Union
US Army Corps of Engineers Avery Clay Jackson Polk Watauga
151 Patton Avenue Buncombe Cleveland Lincoln Rowan Yancey
Room 208 Burke Gaston Macon Rutherford
Asheville, NC 28801-5006 Cabarrus Graham Madison Stanley
Telephone: [phone] Caldwell Haywood McDowell Swain
Fax: [phone] Catawba Henderson Mecklenburg Transylvania
Raleigh Regulatory Field Office Alamance Durham Johnston Rockingham Wilson
US Army Corps Of Engineers Alleghany Edgecombe Lee Stokes Yadkin
6508 Falls of the Neuse Road Ashe Franklin Nash Surry
Suite 120 Caswell Forsyth Northampton Vance
Raleigh, NC 27615 Chatham Granville Orange Wake
Telephone: [phone] Davidson Guilford Person Warren
Page 1 I of 13
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TEMP SILT DITCH
EARTH EMBAN SENT
SILT FENCE
FIBERGIASS ROVING
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TEMPORARY SILT FENCE:
t off-
A temporary silt fence is commonly used at the toe of a fill at section to prey bottom
site sedimentation. It is made of permeable filter fabric buned
stretched and supported by steel posts. The silt fence reduces
flow to prooected le
retaining the -sediment. They may also be used to divert water outlets. Silt fences need to be checked after each significant
fences hal not bee
effectiveness. They must be maintained on a regular basis.
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:
Material With Wire Without Wire
Fabric Type 3 Class A Type 3 Class B
Steel posts length 5 ft 5 ft.
Post spacing 10 ft. 6 ft. maximum
17 March, 1992
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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
built
least 2 times the width of the basin. Thh ? and other devices that control generally
or slow
conjunction with temporary rock silt
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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ROCK PIPE INLET PROTECTION TYPE-A:
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A rock pipe inlet protection type-A is a horseshoe shaped structure with a
The type lt-in
sediment storage area around the outside perimeter of the
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 #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 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 settle the larger sediment
or #57 stone to produce aripple-effect in cow ? tron site. The trapped sediment
particles transported in the stream from
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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March, 1992
o?0FWAT_1__RQG
O ?
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D.
Acting Director
Division of Water Quality
DWQ Project No.: _02-OS`ip Count :
Applicant: NC-TC-r V ?_,?N
71 Project Name: c-17,,r ct T
om.
Date of Issuance of 401 Water Quality Certification:
Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable Buffer
Rules, and any subsequent modifications, the applicant is required to return this certificate to the
401/Wetlands Unit, North Carolina Division of Water Quality, 1650 Mail Service Center, Raleigh, NC,
27699-1650. This form may be returned to DWQ by the applicant, the applicant's authorized agent, or the
project engineer. It is not necessary to send certificates from all of these.
Applicant's Certification
1, / &/EPi hereby state that, to the best of my abilities, due care and
diligence was used in the observation of the construction such that the construction was observed to be built
within substantial compliance and intent of the 401 Water Quality Certification and Buffer Rules, the
approved plans ands eciffiicatio d ther supporting mater1al .
Signature:--% Date: Z?/3/ -
Agent's Certification
I, hereby state that, to the best of my abilities, due care and
diligence was used in the observation of the construction such that the construction was observed to be built
within substantial compliance and intent of the 401 Water Quality Certification and Buffer Rules, the
approved plans and specifications, and other supporting materials.
Signature: Date:
If this project was designed by a Certified Professional
1, _ , as a duly registered Professional (i.e., Engineer,
Landscape Architect, Surveyor, etc.) in the State of North Carolina, having been authorized to observe
(periodically, weekly, full time) the construction of the project, for the Permitee hereby state that, to the
best of my abilities, due care and diligence was used in the observation of the construction such that the
construction was observed to be built within substantial compliance and intent of the 401 Water Quality
Certification and Buffer Rules, the approved plans and specifications, and other supporting materials.
Signature --Registration No. Date
NOM
Division of Water Quality 1650 Mail Service Center Raleigh, NC 27699-1650
Wetlands/401 Unit: [phone]
Fax: [phone]
F W A Michael F. Easley, Governor
\O?Q qpG William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
7 Gregory J. Thorpe, Ph.D.
> y Acting Director
Division of Water Quality
April 18, 2002
Jackson County
DWQ Project No. 020596
SR 1377 (Mack Town Road)
APPROVAL of 401 Water Quality Certification with Additional Conditions
Mr. C. R. Styles, P.E., District Engineer
NCDOT
P.O. Drawer 250
Bryson City, NC 28713
Dear Mr. Styles:
You have our approval, in accordance with the attached conditions and those listed below, to impact
25 linear feet of unnamed tributaries to Mack Town Branch in order to improve SR 1377 (Mack
Town Road) in Jackson County. The project should be constructed in accordance with your
application dated April 10, 2002 (received April 17, 2002). After reviewing your application, we
have decided that this fill is covered by General Water Quality Certification No. 3375 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 only valid for the purpose and design that you described in your application except as
modified below. If you change your project, you must notify us, in writing, and send us 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 conditions. If total wetland fills for
this project (now or in the future) exceed one acre or stream impacts 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.
_
I . NC'DQT?ktalLadhere toBe-SLManag-emernt_Prrtetices for the Protection-of ,SiL faces Waters (March
1997).
2. Where practicable, storm water should be directed to buffer areas or retention basins and must not
be routed directly into streams. Mowing of existing vegetated buffers is strongly discouraged, so
that they may be utilized for storm water sheet flow.
3. Temporary or permanent herbaceous vegetation shall be planted on all bare soil within 10 clays of
ground-disturbing activities to provide long term erosion control.
4. The pipes required for this project shall be installed in such a manner that the original stream
profiles are not altered (i.e. the depth of the channel must not be reduced by a widening of the
streambed). Existing stream dimensions are to be maintained above and below locations of each
culvert. The culvert shall be installed one foot below the stream to allow for fish and other
North Carolina Division of Water Quality, 401 Wetfands 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/ncwetiands/
wildlife movement. If the existing pipe is perched, it shall be removed and replaced, and installed
correctly.
5. All work shall be performed during low flow conditions.
6. All mechanized equipment operated n -a.r si!rface waters must 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 must
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. Use of rip-rap for bank stabilization is to be minimized; rather, native vegetation is to be planted
when practical. If necessary, rip-rap must be limited to the stream bank below the high water
mark, and vegetation must be used for stabilization above high water.
9. Rock silt screens at culvert outlets shall be removed at project completion.
Upon completion of the project, the NCDOT shall complete and return the enclosed
"Certificate of Completion" form to notify NCDWQ when all work included in the §401
Certification has been completed. The responsible party shall complete the attached form
and return it to the 401/Wetlands Unit of the NC Division of Water Quality upon
completion of the project.
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 that 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 919.733.5715
or Mr. Mike Parker of the Asheville Regional Office at 828.251.6208.
Sincerely,
ry J. Thorpe, D.
%, \A ti g Director
Attachment
Pc: Wilmington District Corps of Engineers
John Hendrix, USACE Asheville Field Office
N.CDWQ-Asheviile Regional Office
Central Files
File Copy
*. STA7( o
STATE or NORTH CAROLINA
APR 1 2011
4?lETlAP"?S ?'
020596
DEPARTMENT OF TRANSPORTATION
MICHAEL F. EASLEY LYNDO TIPPETT
GOVERNOR SECRETARY
April 10, 2002
U. S. Army Corps of Engineers
FILE COPY
Regulatory Branch
151 Patton Avenue, Room 208
Asheville, NC 28801-5006
Attention: Mr. John Hendrix tsV??
NCDOT Coordinator
Subject: Proposed Construction of SR 1377(Mack Town Rd.)in Jackson Co.
State Project No. 6.962098T(DWQ Minor Permit Fee $200.00)
Subject:
Dear Mr. Hendrix:
The North Carolina Department of Transportation is proposing to grade, drain, base and
pave primarily along the existing roadway of SR 1377, Mack Town Rd. in Jackson County. In
order to construct this project in accordance with our current secondary road standards, and due
to the replacement/extension of two(2) pipe culverts of an unnamed tributary to Mack Town
Br.(DEM CLASS C), 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 culvert replacements/extensions in the unnamed tributary to Mack Town Br., general notes
and standards on erosion control measures, and a marked County Map are enclosed. We
propose to install the new culverts 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.
_% P.O. Box 250, Bryson City, NC 28713 Phone [phone]
Mr. John Hendrix
Page 2
April 10, 2002
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 consideration will be appreciated.
Yours truly, ??
?' /' c
C. R. Styles, P. E.
District Engineer
DSE:se
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
11.0. Box 250, Bryson City, NC 28713 Phone [phone]
Office Use Only: 0 2 n e 9 6Form Version April 2001
USACE Action ID No. DWQ No. U :J
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
Check all of the approval(s) requested for this project:
® Section 404 Permit
Section 10 Permit
® 401 Water Quality Certification
Riparian or Watershed Buffer Rules
2. Nationwide, Regional or General Permit Number(s) Requested:
14
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: NC DOT - DISTRICT ENGINEER: C. R. Styles, P. E.
Mailing Address: P. O. Drawer 250, Bryson City, NC 28713
Telephone Number: 1-828-488-2131 Fax Number: 1-828-488-3518
E-mail Address: rstyles ,dot. state. nc.us
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: N/A
E-mail Address: N/A
Fax Number: N/A
Page 3 of 13
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.
1. Name of project: Widening of SR 1377, (Mack Town Road) in Jackson County.
2. T.I.P. Project Number (NCDOT Only): 6.962098T
3. Property Identification Number (Tax PIN):
4. Location
County: Jackson
Nearest Town: Dillsboro/Svlva
Subdivision name (include phase/lot number):
Directions to site (include road numbers, landmarks, ctc.):From Asheville take I-40 West and
exit off at exit 27 onto US19-74 . Go approx. 21.0 miles and take exit 83,Dillsboro/Franklin
Exit, onto US 441 S. Go approx. 0.70 miles through one rcdlight and take right on SR 1377 .
Go approx.0.70 miles and take left on SR1377. Go 0.25 miles and take right on SR 1377.
This is the project. NOTE* These directions bring you in on the end of the project(STA.
95+00) Project is a through road.
5. Site coordinates, if available (UTM or Lat./Long): 35D 21' 9.27"N 83D 16' 40.66"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.)
6. Describe the existing land use or condition of the site at the time of this application:
Farmland and Forestland
7. Property size (acres): 3.65 NOTE* Only constructing 0+00-13+30 and 76+50-95+00
Nearest body of water (stream/river/sound/ocean/lake):Unnamed Trib. to Mack Town
Branch(DEM CLASS C).
9. River Basin: Little Tennessee
Page 4 of 13

(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/.)
Describe the purpose of the proposed work: To widen and pave SR 1377 to meet current
NCDOT standards. This includes cutting and filling earthwork where needed, replacing old
drainage structures that are inadequate, and making the road safer by widening shoulders and
changing the road profile.
10. List the type of equipment to be used to construct the project:
Track Hoes, Back Hoes, Dump Trucks, Bulldozers, Manual Labor, etc.
11. Describe the land use in the vicinity of this project:
Rural woodland, some 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.
No prior permits have been applied for this project.
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
Page 5 of 13
1
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. 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***
N/A N/A N/A N/A N/A N/A

* 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.fcma.gov.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, ctc.)
List the total acreage (estimated) of existing wetlands on the property: 0
Total area of wetland impact proposed: 0
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 Culvert extension 5 Unnamed Trib. to Mack
Town Branch Perennial
2 Culvert replacement 20' Unnamed Trib to Mack
Town Branch Perennial

* 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 after, and net loss/gain),
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 arc 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.mapqucst.com, etc.).
Page 6 of 13
Cumulative impacts (linear distance in feet) to all streams on site: 25'
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 Wat)
(if applicable) Type of Waterbody
(lake, pond, estuary, sound,
bay, ocean, etc.)
N/A N/A N/A N/A N/A

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
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): E] uplands F-1 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 SR 1377 to current NCDOT standards. All pipe replacements will be placed below
the existing stream bed gradient so natural substrate can be re-established.
Page 7 of 13
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
littp:Hh2o.enr.state.nc.us/ncwetlands/strmgide.htm1.
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 13
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 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 of Non-riparian wetland mitigation requested (acres):-
Amount of Coastal wetland mitigation requested (acres): N/A
IX. Environmental Documentation (DWQ Only)
Does the project involve an expenditure of public funds 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] to review current thresholds for environmental documentation.
Yes ? No
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 (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.
N/A
Page 9 of 13
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Neuse), 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 infonnation:
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
(square feet) Multiplier Required
Mitigation
1 3
2 1.5
Total
Gone I extcnas out su tcet perpcnaicular trom near oanK of channel; Lone z 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.
N/A
XI. Stormwater (DWQ Only)
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.
The existins compacted gravel roadway acts as an impervious surface. Paving of the roadway
should eliminate sedimentation from fines associated with gravel surface treatment. The roadway
surface will be approximately 40% of the right-of-way area. Stormwater will be diverted through
settling basins or grass lined buffers prior to entering streams. ( See erosion control plan).
XII. Sewage Disposal (DWQ Only)
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.
No wastewater will be generated from the project.
Page 10 of 13
XIII. Violations (DWQ Only)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes E] No
Is this an after-thc-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 Species, accessibility problems, or other issues outside of the applicant's control).
G
-OZ
Applicant/Agent's Sig6dture Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
US Army Corps Of Engineers Field Offices and County Coverage
Asheville Regulatory Field Office Alexander Cherokee Iredell Mitchell Union
US Army Corps of Engineers Avery Clay Jackson Polk Watauga
151 Patton Avenue Buncombe Cleveland Lincoln Rowan Yancey
Room 208 Burke Gaston Macon Rutherford
Asheville, NC 28801-5006 Cabarrus Graham Madison Stanley
Telephone: [phone] Caldwell Haywood McDowell Swain
Fax: [phone] Catawba Henderson Mecklenburg Transylvania
Raleigh Regulatory Field Office Alamance Durham Johnston Rockingham Wilson
US Army Corps Of Engineers Alleghany Edgecombe Lee Stokes Yadkin
6508 Falls of the Neuse Road Ashe Franklin Nash Surry
Suite 120 Caswell Forsyth Northampton Vance
Raleigh, NC 27615 Chatham Granville Orange Wake
Telephone: [phone] Davidson Guilford Person Warren
Page 11 of 13
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EARTH _EMBAN yjvZNT
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FISERGUALSS ROVING
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TEMPORARY SILT FENCE:
A temporary silt fence is commonly used at the toe of a filled at section to prevent off-
site sedimentation. It is made of permeable filter fabric bun
stretched and supported by steel posts. The silt fence reduces the
flow to water floec ed le
retaining the sediment. They may also be used to divert
outlets. Silt fences need to be checked after each significant
fences seal not bee
effectiveness. They must be maintained on a regular basis.
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 ateri al
Fabric
Steel posts length
Post spacing
With Wire Without Wire
Type 3 Class A Type 3 Class B
5 ft 5 ft.
10 ft. 6 ft. maximum
17 March, 1992
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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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ROCK PIPE INLET PROTECTION TYPE-A:
JeR..
A rock pipe inlet protection type-A is a horseshoe shaped s?c?e wrne taybpe ltt--in
sediment storage area around the outside perimeter of the s
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 drainage
inlet protection utilizes class-B stone lined with #5 or #57 stone to protect
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
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March,1992
ROCK SILT SCREEN:
7
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 the site. Thee trapped sediment
shall be cleaned out before the device is removed
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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