HomeMy WebLinkAbout20100817 Ver 1_Application_20101004
STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
BEVERLY EAVES PERDUE
GOVERNOR
EUGENE A. CONTI, JR.
SECRETARY
September 30, 2010 ? @90MR
Mr. Brian Wrenn ?w( _ D
Division of Water Quality OC I - 4 2010
401/Transportation Permitting Unit 100817 ?
1650 Mail Service Center MEX4N MAN0MNftTERWANGl
Raleigh, NC 27699-1650
SUBJECT: Pipe Replacement/Secondary Road Paving on SR 2274 (Gant Road), Gaston
County
Dear Mr. Wrenn:
The North Carolina Department of Transportation requests authorization for the replacement of a
40-foot long, 24" CMP with a 60-foot long, 36" HDPE which was done in conjunction with a
secondary road paving project on SR 2274 (Gant Road) in Gaston County. Due to the excessive
amount of metal debris and trash, etc. around the outlet end of the pre-existing pipe, the pipe
itself could not be located; therefore, the pipe neither length nor invert elevations were known.
Due to these unknown factors, excavation of the old pipe and debris was allowed to determine
pre-existing pipe information and to develop an adequate plan for pipe replacement.
The replacement pipe placed on different skew at the inlet resulted in 7 feet of upstream channel
loss. After removal of some of the debris which had placed on the stream channel by the
adjacent property owner, 10 feet of downstream channel was reconstructed and stabilized with
coir fiber matting. Five feet of riprap was used at the pipe inlet and outlet for structure
stabilization. Also, due to the steep slope of the upstream channel (4%), the pipe was placed on
streambed grade to prevent upstream destabilization. Temporary cofferdams and bypass pumping
were used to manage the streamflow during construction. The scope of the work resulted in 47
feet of permanent impacts to an unnamed tributary to Long Creek, which is classified as Class C
waters by the Division of Water Quality.
The project area is not located within 'h mile of any critical watershed area nor is SR 2274 a rural
or urban arterial; therefore, hazardous spill basins are not required. Enclosed is the hazardous
spill basin checklist.
This office has conducted a GIS and field survey for the project for historical sites and
threatened/endangered species sites. No sites listed on the National Register of Historic Places
are located in the vicinity of the project nor did there appear to be any eligible structures. The
State Historic Preservation office reviewed and cleared the secondary road project 2/4/08 (ER
08-0068).
Post Office Box 47 Shelby, North Carolina 28151-0047
i
SR 2274, Gant Road
Page 2
September 30, 2010
The federally listed species for Gaston County (USFSW listed date January 31, 2008) include
Schweinitz's sunflower (Helianthus schnveinitzii) - Endangered (E) and the Bog turtle
(Glyptemys muhlenbergii)- Threatened due to Similarity of Appearance (T SIA). National
Heritage Program records document the nearest Schweinitz's Sunflower location approximately
4.0 miles east of the proposed project area. The sunflower is usually found in upland open areas
protected from shade or excessive competition. There is no potential habitat within the proposed
project area; however, no species were observed during the site visit. No impact on the species is
anticipated. National Heritage Program records document the nearest bog turtle location
approximately 2.0 miles north of the proposed project area. Bog turtles are usually found in
bogs, marshes, and wet pastures. There is no suitable habitat located within the project area and
no species were observed. T/SA species are not subject to Section 7 consultation; however, no
impact on this species is anticipated.
I have enclosed a pre-construction notification for a NW914, sketches of planned activities,
erosion control plans, and location maps relative to the project.
Project information for the 401 Automated Payment Procedure is as follows:
0 Work order number: 150456-55120005-12C.036069-3126
• TIP#: NA
• Project Category: $240.00 Fee
If you have any questions or concerns please feel free to contact me at (704) 480-9044. Thank you for
your time and consideration on this matter.
Respectfully yours,
M.L. Holder, P.E.
Division Engineer
Twelfth Division
BY:
Trish Simon
Division 12 Environmental Supervisor
Enclosures
Cc: Polly Lespinasse, Division of Water Quality, Mooresville Regional Office
o? e WArFgQc
oqqiiii? -
Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.3 Dec 10 2008
Pre-Construction Notification PC Form
A. Applicant Information
11. Processing
Ila. Type(s) of approval sought from the
Corps:
El Section 404 Permit ? Section 10 Permit
11 b. Specify Nationwide Permit (NWP) number: or General Permit (GP) number:
1 c. Has the N WP or GP number been verified by the Corps? ? Yes ® No
1d. Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification - Regular ? Non-404 Jurisdictional General Permit
? 401 Water Quality Certification - Express ? Riparian Buffer Authorization
1e. Is this notification solely for the record
because written approval is not required? For the record only for DWQ 401
Certification:
? Yes N No For the record only for Corps Permit:
® Yes ? No
If . Is payment into a mitigation bank or in-lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in-lieu
fee program. ? Yes ® No
'I g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 In
below. ? Yes ® No
I h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes ® No
Project Information
2a. Name of project: SR 2274 (Gant Road)
2b. County: Gaston
2c. Nearest municipality / town: Dallas
2d. Subdivision name: NA
2.e. NCDOT only, T.I.P. or state
project no: 12C.036069
3. Owner Information
3a. Name(s) on Recorded Deed: NCDOT Right of Way
3b. Deed Book and Page No.
3c. Responsible Party (for LLC i f
applicable):
3d. Street address:
3e. City, state, zip:
3f . Telephone no.:
3g. Fax no.:
3h . Email address:
Page 1 of 11
PCN Form -Version 1.3 December 10, 2008 Version
14. Applicant Information (if different from owner)
4a. Applicant is: ? Agent ? Other, specify:
14b. Name: Mike Holder
4c. Busines s name
(if applicable): N.C. Department of Transportation, Division 12
4d. Street address: 1710 East Marion Street
4e. City, state, zip: Shelby, NC 28151
'4f. Telephone no.: 704-480-9020
4g. Fax no., 704-480-5401
4h. Email address: mholder@ncdot.gov
5. Agent/Consultant Information (if applicable)
5a. Name: Trish Simon
5b. Business name
(if applicable): N.C. Department of Transportation, Division 12
5c. Street address: 1710 East Marion Street
Sd. City, state, zip: Shelby, NC 28151
iie. Telephone no.: 704-480-9044
5f. Fax no.: 704-480-5401
!ig. Email address: tsimon@ncdot.gov
Page 2 of 11
PCN Form - Version 1.3 December 10, 2008 Version
B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID): NA
1 b. Site coordinates (in decimal degrees): Latitude: 35.3029 Longitude: - 81.1572
(DD.DDDDDD) (-DD.DDDDDD)
1c. Property size: <.10 acres (permit site) ; Entire project = .032 acres
2. Surface Waters
I2a. Name of nearest body of water (stream, river, etc.) to UT to Long Creek
proposed project:
I2b. Water Quality Classification of nearest receiving water: Class C
2c. River basin: Catawba
3. Project Description
'3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
Existing pipe on unpaved secondary road. Surrounding landuse is designated residential and cropland/pasture.
!3b. List the total estimated acreage of all existing wetlands on the property:
0
,3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
80
3d. Explain the purpose of the proposed project:
The purpose of the proposed work is to replace a deteriorating pipe and pave an unpaved secondary road for the safety
of the travelling public.
3e. Describe the overall project in detail, including the type of equipment to be used:
Replacement of a 40-foot long, 24" CMP with a 60-foot long, 36" HDPE. The replacement pipe placed on different skew
at inlet resulted in 7 feet of stream loss. Due to the debris placed on the stream channel by the adjacent property owner
at the outlet end of the prior pipe, 10 feet of downstream channel was reconstructed and stabilized with coir fiber matting.
Five feet of riprap was used at the pipe inlet and outlet for structure stabilization. Project constructed using typical heavy
equipment (trackhoe, backhoe, etc.).
4. Jurisdictional Determinations
sta. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property / Yes ®No ? Unknown
1 project (including all prior phases) in the past?
Comments: Jurisdictional evaluation made by Div 12 DEO.
4b. If the Corps made the jurisdictional determination, what type ? Preliminary ? Final
of determination was made?
4c. If yes, who delineated the jurisdictional areas? Agency/Consultant Company:
Name (if known): Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
(
5. Project History
5 a. Have permits or certifications been requested or obtained for ? Yes ® No ? Unknown
this project (including all prior phases) in the past?
5 b. If yes, explain in detail according to "help file" instructions.
Page 3 of 11
PCN Form -Version 1.3 December 10, 2008 Version
6. Future Project Plans
6a. Is this a phased project? ? Yes ® No
6b. If yes, explain.
Page 4 of 11
PCN Form -Version 1.3 December 10, 2008 Version
C. Proposed Impacts Inventory
1. Impacts Summary
1a. Which sections were completed below for your project (check all that apply):
? Wetlands ? Streams - tributaries ? Buffers
? Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number - Type of impact Type of wetland Forested (Corps - 404, 10 Area of impact
Permanent (P) (if known) DWQ - non-404, other) (acres)
or Temporary
IW1 ? P ? T ? Yes ? Corps
? No ? DWQ
'W2 ? P ? T ? Yes ? Corps
? No ? DWQ
W3 ? P ? T ? Yes ? Corps
? No ? DWQ
W4 ? PEI T ? Yes ? Corps
? No ? DWQ
? Yes ? Cor s
W5 ?P?T p
_ ? No ? DWQ
W6 ? P ? T ? Yes ? Corps
? No ? DWQ
2g. Total wetland impacts
21h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f. 3g.
Stream impact Type of impact Stream name Perennial Type of jurisdiction Average Impact
number - (PER) or (Corps - 404, 10 stream length
Permanent (P) intermittent DWQ - non-404, width (linear
or Temporary (INT)? other) (feet) feet)
(T)
S1 ®P ? T Increase in pipe length LIT to Long Creek ? PER
® INT ® Corps
® DWQ 1.5
20
32 ® P ? T Loss in upstream [:1 PER ® Corps 1.5 7
channel ® INT ® DWQ
:
®P ? T Downstream channel ? PER ® Corps
1.5
10
I
1 relocation/reconstruction ® INT ® DWQ
EIS4 ®P ? T Riprap stabilization @ ? PER ® Corps 1.5 10
I inlet & outlet ® INT ® DWQ
I [:1 P ®T Cofferdam/bypass E] PER ® Corps 1.5 80
pumping ® INT ® DWQ
S6 ? P F1 T ? PER ? Corps
I ? INT ? DWQ
3h. Total stream and tributary impacts 47
3i. Comments:
Page 5 of 11
PCN Form - Version 1.3 December 10, 2008 Version
1 4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individually list all open water impacts below.
4a.
Open water
impact number
- Permanent
(P) or
Temporary 4b.
Name of waterbody
(if applicable) 4c.
Type of impact 4d.
Waterbody type 4e.
Area of impact (acres)
101 ?P?T
102 ?P?T
103 ?P?T
104 ?P?T
14L Total open water impacts
14g. Comments:
15. Pond or Lake Construction
if and or lake construction proposed, then com lete the chart below.
5a.
Pond ID 5b.
Proposed use or purpose of 5c.
Wetland Impacts (acres) 5d.
Stream Impacts (feet) 5e.
Upland
(acres)
,number pond
Flooded
Filled
Excavated
Flooded
Filled
Excavated
Flooded
P1
P2
5f. Total
5g. Comments:
5h. Is a dam high hazard permit required?
? Yes ? No If yes, permit ID no:
:ii. Expected pond surface area (acres):
Size of pond watershed (acres):
5k. Method of construction:
Page 6 of 11
PCN Form -Version 1.3 December 10, 2008 Version
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then you MUST fill out Section D of this form.
6a.
? Neuse ?Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number- Reason Buffer Zone 1 impact Zone 2 impact
Permanent (P) for impact Stream name mitigation (square feet) (square feet)
or Temporary required?
I131 ?P?T ?Yes
? No
B2 ?P?T ?Yes
? No
B3 ?P?T ?Yes
? No
6h. Total buffer impacts
Bi. Comments:
D. Impact Justification and Mitigation
1. Avoidance and Minimization
la. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
Due to the steep slope of the upstream channel, the pipe is placed on streambed grade to prevent upstream destabilization.
The channel is an intermittent channel with no observable fish populations.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Channel reconstruction at outlet following natural channel design prinicipals (stabilized with coir fiber matting).
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
?_a. Does the project require Compensatory Mitigation for ? Yes ®No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply): ? DWQ ? Corps
? Mitigation bank
2c. If yes, which mitigat ion option will be used for this project? ? Payment to in-lieu fee program
? Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank:
3b. Credits Purchased (attach receipt and letter) Type Quantity
Page 7 of 11
PCN Form -Version 1.3 December 10, 2008 Version
3c. Comments:
4. Complete if Making a Payment to In-lieu Fee Program
4a. Approval letter from in-lieu fee program is attached. ? Yes
4b. Stream mitigation requested: linear feet
4c. If using stream mitigation, stream temperature: ? warm ? cool ?cold
14d. Buffer mitigation requested (DWQ only): square feet
14e. Riparian wetland mitigation requested: acres
I4f. Non-riparian wetland mitigation requested: acres
I4g. Coastal (tidal) wetland mitigation requested: acres
!4h. Comments:
15. Complete if Using a Permittee Responsible Mitigation Plan
15a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) - required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation? ? Yes ® No
$b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
Zone 6c.
Reason for impact 6d.
Total impact
(square feet)
Multiplier 6e.
Required mitigation
(square feet)
?one 1 3 (2 for Catawba)
?one 2 1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in-lieu fee fund).
fh. Comments:
Page 8 of 11
PCN Form -Version 1.3 December 10, 2008 Version
E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
la . Does the project include or is it adjacent to protected riparian buffers identified ? Yes ®No
within one of the NC Riparian Buffer Protection Rules?
1b. If yes, then is a diffuse flow plan included? If no, explain why.
? Yes ? No
Comments:
12. Stormwater Management Plan
I2a. What is the overall percent imperviousness of this project? 0%
I2b. Does this project require a Stormwater Management Plan? ? Yes ®No
I2c. If this project DOES NOT require a Stormwater Management Plan, explain why: Com plies with NCDOT's individual
NPDES permit NCS000250. (Implementation, management, and inspection of erosion control devices and control of
discharge sources (ie. construction equipment).
,2d . If this project DOES require a Stormwater Management Plan, then provide a brief, na rrative description of the plan:
? Certified Local Government
2e. Who will be responsible for the review of the Stormwater Management Plan? ? DWQ Stormwater Program
? DWQ 401 Unit
3. Certified Local Government Stormwater Review
$a. In which local government's jurisdiction is this project? NA
? Phase II
3b. Which of the following locally-implemented stormwater management programs ? NSW
? USMP
apply (check all that apply): ? Water Supply Watershed
? Other:
3c. Has the approved Stormwater Management Plan with proof of approval been ? Yes ? No
attached?
4. DWQ Stormwater Program Review
? Coastal counties
? HOW
4a. Which of the following state-implemented stormwater management programs apply ? ORW
(check all that apply): ? Session Law 2006-246
? Other:
I
4
b. Has the approved Stormwater Management Plan with proof of approval been
attached? ? Yes ? No
5! DWQ 401 Unit Stormwater Review
5
i a. Does the Stormwater Management Plan meet the appropriate requirements? ® Yes ? No
i
5
b. Have all of the 401 Unit submittal requirements been met?
® Yes ? No
Page 9 of 11
PCN Form - Version 1.3 December 10, 2008 Version
F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1a. Does the project involve an expenditure of public (federal/state/local) funds or the ®Yes ? No
use of public (federal/state) land?
1 b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State ? Yes N No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
i
1 c. If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
letter.)
i ? Yes ? No
Comments: NA
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ? Yes R No
or Riparian Buffer Rules (15A NCAC 26 .0200)?
2b. Is this an after-the-fact permit application? N Yes ? No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s): Due to the
excessive amount of metal debris and trash, etc. around the outlet end of the pre-existing pipe, the pipe itself could not be
located; therefore, the length of the pipe nor the location of the pipe inverts were known. Due to these unknown factors,
i;xcavation of the old pipe was allowed to determine pre-existing pipe information and to develop an adequate plan for pipe
replacement.
t. Cumulative Impacts (DWQ Requirement)
ia. Will this project (based on past and reasonably anticipated future impacts) result in ?Yes N No
additional development, which could impact nearby downstream water quality?
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
The project is a minimum criteria project which has low potential for cumulative/indirect impacts and will not result in
additional development which could impact water quality.
4'. Sewage Disposal (DWQ Requirement)
4a. 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.
Page 10 of 11
PCN Form -Version 1.3 December 10, 2008 Version
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or ? Yes ®No
habitat?
I5b. Have you checked with the USFWS concerning Endangered Species Act ? Yes ®No
impacts?
?
Raleigh
ISc. If yes, ind icate the USFWS Field Office you have contacted.
? Asheville
Sd. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
NC Natural Heritage Program database.
I6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat? ? Yes ®No
$b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
No salt marshes, oyster reefs, or seagrass beds in the vicinity of the project.
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation ? Yes ®No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
The State Historic Preservation office reviewed and cleared project 2/4/08 (ER 08-0068).
t?. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain? ? Yes ® No
Sb. If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination? FEMA FIRM panal number: 3710355700J
q,36LIa
Applicant/Agent's Printed Name Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant
is provided.)
Page 11 of 11
PCN Form -Version 1.3 December 10, 2008 Version
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Date: 9/29/2010 Caption: Secondary Road Paving/Pipe Replacement, SR 2274 (Gant Rd),
Scale: 1 inch equals 1333 feet UT to Long Creek, Class C Water, Catawba River Basin
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Pipe Replacement/Secondary Road Paving
Gant Road, SR 2274, Gaston County
Downstream area before pipe replacement
,f
)ownstream
Post-construction)
Upstream
(Post-construction)
NCDOT
HAZARDOUS SPILL BASIN CHECKLIST
Division: 19 County: C,acrnn Project ID: 12.203611
River Basin: Catawba Bridge No: NA
Route: SR 2274, Gant Road
Stream: UT to Long Creek
Water Quality Criteria:
Yes No
Stream Crossing Blue Line On USGS r r?
ORW r r
WS1 r r
WS 11,111 OR IV, Crossing Within 0.5mi of W.S. Critical Area r r
Roadway Criteria:
Route Designation-
Yes No
Arterial Urban r r
Arterial Rural C F
Additional Site Information:
Yes No
Is a Hazardous Spill Basin Required? r it
Criteria Based Upon NCDOT "Best Management Practices for the
Protection of Surface Waters" (March, 1997).
EROSION AND SEDIMENTATION
CONTROL PLAN
GASTON COUNTY, NC
DATE August 5, 2010
DIVISION OF HIGHWAYS
DEPARTMENT OF TRANSPORTATION
STATE OF NORTH CAROLINA
W.O. # 12C.036069
PURPOSE
The purpose of this Erosion and
Sedimentation Control Program of the
Division of Highways is to control accelerated
erosion and sedimentation resulting from the
construction and maintenance of roads and
highways in North Carolina. This program is
developed pursuant to the requirements
contained in the Rules and Regulations for
(Erosion and Sedimentation Control which
were adopted by the North Carolina
Sedimentation Control Commission on April
M 1974.
PROJECT
DESCRIPTION
Gantt Rd. The NCDOT will be grading, widening, and paving Gantt Rd. No problem
areas are anticipated. The work will be completed during the 2010/2011 construction
season.
CONSTRUCTION SEQUENCE
1. Grading to be started by state forces. Install all necessary silt fences, sediment basins, and check dams
and begin clearing construction area.
2. Rough grade the construction area and begin installing any storm drainage and/or cross lines. Install
inlet and outlet protection as storm drainage is being installed.
3. As an area is brought to finish grade and the black base is placed for the road, and the shoulder
finished, then seed, mulch and tack should be provided for denuded areas.
4. Leave all erosion control devices in place until vegetation has been established sufficiently to
withstand erosion. DO NOT remove any erosion control devices until directed by the County
Engineer.
MAINTENANCE PLAN
1. All erosion and sediment control practices will be checked for stability and operation following every
runoff producing rainfall but in no case less than once every week. Any repairs will be made
immediately to maintain all practices as designed.
2. Sediment will be removed from behind the sediment fence when it becomes about 0.5 feet deep at the
fence. The sediment fence will be repaired as necessary to maintain a barrier.
3. All seeded areas will be fertilized, reseeded as necessary and mulched according to the instruction in
the seeded specifications to maintain a vigorous, dense vegetative cover.
4. Outlet protection will be installed when outlets are installed. Filter fabric will be placed under the
entire stone section and will be repaired and replaced if damaged during any phase of construction.
5. Sediment will be removed from the basin when it reaches 1.0 foot below the emergency spillway. The
filter stone is to be cleaned or replaced when basin no longer drains properly.
GROUND COVER FOR SLOPES, FILLS AND OTHER GRADED AREAS
The angles for graded slopes and fills shall be no greater than the angle which can be retained by vegetative
cover or other adequate erosion control devices or structures.
Seeding should be done in accordance with the specifications for that season of the year.
Additional erosion control measures may be required depending on the actual field conditions.
4.2 PIPE/CULVERT INSTALLATION
(Taken from BMP Aug.2003, page 26)
This section describes the steps to take when an existing pipe or
culvert is being constructed or replaced on a jurisdictional stream.
1. Prior to installing Erosion Control, identify permit conditions
and impact area limits. Contact the Division Environmental
Officer (DEO) for information on permit drawings or
jurisdictional areas.
Erosion Control
2. Install temporary silt fence or sift ditch to treat runoff from the
work area or isolate the work area from the jurisdictional
areas, such as wetlands or riparian buffers (See Section 5.1).
3. Install Temporary Rock Sift Check Type "A" or Temporary
Sediment Dam Type "B" in ditch lines to contain sediment
prior to discharge into the watercourse (See Section 5.1).
- Do not install Temporary Rock Silt Check Type
"A" or Temporary Sediment Dam Type "B" in
stream channel
Manaoina the Water Course
4. On larger streams, flow diversion may be used to isolate the
work area using bypass pumping, piped diversion or fabriclined
channel (See Section 5.2). On smaller streams, or at low
flow conditions, an impervious dike may be used to
temporarily dewater the work area within the stream channel
(See Section 5.3).
- All temporary in-stream structures must be
installed with geotextlle fabric beneath them, and
removed in their entirety immediately upon
completion of in-stream work
" In CAMA-AECs, the type of flow diversion is
identified in the permit.
5. Temporary stream crossings may be utilized in order to
provide equipment access, if underlain by geotextile fabric, so
that the riprap may be entirely removed (See Section 5.5).
" Confirm that the temporary stream crossing is
shown in the permit drawings as an approved
temporary impact.
- In CAMA-AECs, the type of temporary
Managing the Work Area
6. Dewatering devices are typically needed to keep the work
area dry (see Section 5.4). The permit conditions and the
amount of available space and length of pipe replacement or
project limits will determine the type of dewatering device to
be used. Every effort should be made to minimize the extent
of the area to be dewatered and the length of time the site is
dewatered.
" In CAMA-AECs, the type of dewatering device is
identified in the CAMA permit
7. Install the pipe/culvert per the NCDOT standards and
specifications, and any specified permit conditions. Note that
pipes and culverts shall be buried a minimum depth below the
existing streambed, as defined below, in order to allow for
aquatic organism passage during low flow conditions.
Variance may be obtained by the DEO to allow for deviations
in pipe burial depths due to bedrock, steep gradients in the
stream channel, existing headcutting, potential for drainage of
upstream wetlands, or other concerns.
• Foundation material shall be confined to the
pipe culvert area and shall not be placed in the
existing stream channel outside of the permitted
impact area.
• Excavation of the stream channel shall not exceed
10 feet on either end of the new pipe or culvert
unless the stream is being relocated per Section
4.9, or if indicated in the permit
• Within river basins subject to the Riparian Buffer
Rules, projects may be exempt if work in the
stream channel is limited to a total of 40 feet of
additional impact, including pipe extension.
• In CAMA AECs (within the twenty coastal
counties), all pipes and culverts must be buried
one foot below the existing average streambed
elevation.
• In other parts of the state, pipes(culverts must be
buried as follows:
o Culverts 48-Inches in diameter or greater shall be
buried one foot below the streambed elevation.
Average streambed elevation shall be measured
from multiple measurements taken outside of the
area of scour or road crossing disturbance,
outside of the ROW limits, if necessary.
o Culverts less than 48-inches shall be buried a
depth equal to 20•/ of the pipeiculvert diameter,
such as the following examples. The hydraulic
conveyance of the culvert however should not be
compromised.
Examples:
• 36" = 7"
• 30„ = 6„
•24"=5n
• 18" = 4"
8. Stream pattern, dimension and profile shall be maintained
by pipe/culvert installation.
• A 4-foot diameter pipe culvert installed in a 2-foot
wide stream may require baffles in order to
maintain aquatic organism passage (AOP) during
low flow conditions.
• Pipe size should at least match stream width
wherever possible, but a 2-foot wide culvert
installed In a 4-foot wide stream may also need
baffles to reduce velocities.
• Two 48 inch pipes installed in a 10-foot wide
stream would require that one pipe be installed at
a lower elevation, and in alignment with the low
flow stream channel elevation, so that AOP is
maintained during low flow conditions.
• The low flow pipe should be aligned with the
deepest part of the stream channel, so that flow is
maintained during low flow conditions.
• No "live" or fresh concrete shall come into contact
with jurisdictional waters until the concrete has
cured.
9. Install the riprap shoulder slope and outlet protection on
upstream and downstream channels where indicated on
the permit drawings (See Section 5.6). Do not exceed
approved limits in the permit. Contact the DEO if the
permit or permit drawings are not clear.
• Riprap shall consist of clean rock or masonry
material free of debris or pollutants (such as
asphalt).
• Outlet protection should be countersunk at least
one foot below the average stream bed elevation.
• Placement of riprap within jurisdictional waters
must be the minimum necessary to protect or
ensure shoulder slope and streambank stability.
10. Remove temporary flow diversion or dewatering devices and
accumulated sediment before allowing stream flow to resume
through the new pipe or culvert.
• The impervious dike shall be completely removed
to pre-project conditions.
• Care should be taken to not disturb or destabilize
the undisturbed streambed during removal of
temporary devices.
11. Stream realignment can occur within approved permit impact
limits. Minimize sharp or acute angles in stream alignment
wherever possible. Stream channel pattern, dimension and
profile should be maintained similar to the upstream and
downstream stream reach.
12. Bioengineering techniques may be used to stabilize
streambanks where feasible.
13. Begin backfill operations. Intermediate erosion and
sedimentation control BMPs shall be installed prior to the
backfill operation to provide containment between the work
area and the watercourse.
14. If the pipe/culvert is part of a larger roadway project, enough
backfill should be placed to allow for the removal of the
temporary stream crossing. If no temporary stream crossing
is required then enough backfill should be placed to prevent a
washout during a minor storm event.
Ground Stabilization
15. Upon completion of backfill operations, prepare slopes and
other disturbed areas and stabilize (See Section 5.6).
16. Maintain erosion and sedimentation control measures until
ground vegetation is well established.
Site Cleanup
17. Upon establishment of vegetation, remove remaining erosion
and sedimentation control BMPs, stabilize and reestablish
remaining disturbed areas to proper grade, such as buffers,
wetlands, and water.
• Within jurisdictional waters & wetlands all
temporarily disturbed areas shall
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