20110621 Ver 1_Stormwater Plans_20110707

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BEVERLY PURDUE
GOVERNOR
Stormwater Section
N C Division of Water Quality
Winston -Salem Regional Office
585 Waughtown St
Winston - Salem, NC 27107
Attention Ms Amy Euhss
v
STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
P 0 Box 25201 Raleigh, NC 27611 5202
PHONE [phone]
June 27 2011
�VTI, JR
SEC
H
Subject State Stormwater Permit Request for the replacement of Bridge #29 over Mill Creek on
SR 1322 in Surry County Debit WBS 33623 1 1 $505
Dear Ms Euhss
The North Carolina Department of Transportation is scheduled to replace Bridge #29 with a new longer
bridge at the same location Since this bridge crosses an outstanding resource water I have included a
Stormwater Application Form, the Project Scope Narrative two sets of the project plans and the authority
to debit $505 for the permit application fee Please review this project for authorization by your Division
We would like to begin construction as soon as possible If further information is required, please let me or
Ivan Dishman, PE know Your early review and consideration will be appreciated
Sincerely
_
Heath Slaughter
Division Environmental Officer
Enclosures
cc Monte Matthews US Army Corps of Engineers
Brian Wrenn, Division of Water Quality
Mike Pett -Rohn, PE Division Engineer
Ivan Dishman, PE Division Bridge Program Manager
Heath Slaughter Division Environmental Officer
Neil Trivette Roadside Environmental Field Operations Engineer
P O Box250 N WILKESBORO NC 28659
PxoNE [phone] FAx [phone]

OFFICE USE ONLY
Date Received Fee Paid Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
NORTH CAROLINA DEPARTMENT OF TRANSPORTATION
LINEAR ROADWAY PROJECT
This form may be photocopied for use as an onginal
DWQ Stormwater Management Plan Review
A complete stormwater management plan submittal includes this application form, a supplement form for each BMP
proposed (see Section V) design calculations and plans and specifications showing all road and BMP details
PROJECT INFORMATION
NCDOT Project Number 33623 1 1 County Surr
Project Name TIP# B-4284 ftlace Bridge #29 on SR 1322 over Mill Creek
Project Location 12 miles NE of Mtn Park
Contact Person Ivan Dishman. PE Phone [phone] Fax [phone]
Receiving Stream Name Mill Creek River Basin Yadkin Class C Trout, ORW
Proposed linear feet of project 400
Proposed Structural BMP and Road Station (attach a list of station and BAP type if more room is needed)
Grass fill embankment
Type of proposed protect (check all that apply)
❑ New E]Widemng ❑2 lane* ❑4 lane* ❑Curb and Gutter ®Budge Replacement
❑Other (Describe)
*2 lane and 4 lane imply that roadside ditches are used unless Curb and Gutter is also checked
II REQUIRED ITEMS CHECKLIST
Initial in the space provided below to indicate the following design requirements have been met and supporting
documentation is attached Supporting documentation shall at a minimum, consist of a brief narrative description
including (1) the scope of the project (2) how the items below are met (3) how the proposed best management practices
minimize water quality impacts and (4) any significant constraints and/or justification for not meeting a b c and d to the
maximum extent practicable
ID er s Initials
a The amount of impervious surface has been minimized as much as possible
b The runoff from the impervious areas has been diverted away from surface waters as much as possible
c Best Management Practices are employed which minimize water quality impacts
).1 d Vegetated roadside ditches are 3 1 slope or flatter

III. OPERATION AND MAINTENANCE AGREEMENT
I acknowledge and agree by my initials below that the North Carolina Department of Transportation is responsible for the
implementation of the four maintenance items listed I agree to notify DWQ of any operational problems with the BMP s
that would impact water quality or prior to making any changes to the system or responsible party
Maintenance Engineer s Initials
;9,ca BMP s shall be inspected and maintained in good working order
b Eroded areas shall be repaired and reseeded as needed
Stormwater collection systems including piping mlets and outlets shall be maintained to insure proper
functioning
Maintenance Engineer s Name
Title %�1,217f
IV APPLICATION CERTIFICATION
I (print or type name) Zyav\'I o of --0 V ( I ' --,, D H Branch,
certify that the information included on this permit application form is to the best of my knowledge correct and that the
protect will be constructed in conformance with the approved plans and that the proposed project complies with the
requirements of 15A NCAC 2H 1000
Title y s%oh -8 r,, J Q -? o i, .,
Address P- B ck -2w M W 14ps�.Q o N C a Sto S9
Signature
V SUPPLEMENT FORMS
Date Lv1a7111
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BUT
specified for this protect Contact the Stormwater and General Permits Unit at (919) 733 -5083 for the status and
availability of these forms
Form SW401 Low Density
Form SW401 -Curb Outlet System
Form SW401 -Off Site System
Form SW401 -Wet Detention Basin
Form SW401- Infiltration Basin
Form SW401- Infiltration Trench
Form SW401 Bioretention Cell
Form SW401 Level Spreader
Form SW401- Wetland
Form SW401- Grassed Swale
Form SW401 -Sand Filter
Low Density Supplement
Curb Outlet System Supplement
Off Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader /Filter Strip /Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement

STORMWATER MANAGEMENT PLAN
Project 33623 1 1 TIP# B -4284 June 22 2011
Surry County
Project Engineer Ivan Dishman, PE
Roadway Description
This project consists of replacing Bridge #29 over Mill Creek on SR 1322 and improving the
roadway bridge approaches The existing 20 x 36 bridge is structurally deficient and will be
replaced with a new 30 x 110 bridge at the same location An off -site detour will be utilized
during construction Total project length is 400 linear feet The existing 8' travel lanes will be
widened to 13' including the paved shoulders Due to tapering impervious surface area will
increase by approximately 0 05 acres The project drainage consists of one drop inlet and stub
out pipe near station 10+75 left as well as a rock lined ditch running through an already ditched
and disturbed wetland in the southwestern quadrant of the bridge
Environmental Description
This project is located in the Yadkin River Basin and is not subject to riparian buffer rules Mill
Creek is classified as Class C Trout ORW at this location No other jurisdictional streams will
be impacted by this proposed project
Best Management Practices and Mai or Structures
The primary goal for Best Management Practices (BMPs) is to prevent degradation of the state's
surface waters by the location, construction and operation of the highway system BMPs are
activities practices and procedures taken to prevent or reduce stormwater pollution Due to
steep terrain and limited right -of -way there is not a suitable location for a structural BMP
11 Required Items Checklist
The proposed structure is a 110 long 2 span 21 cored slab bridge with spill through abutments
Approximately 400 linear feet of roadway is being widened, including the bridge
a Minimized to the extent hydraulically possible
b Stormwater on the southern end of the project will sheet flow off of the roadway
Due to the required superelevation of the bridge flow from the northern section of
the bridge is concentrated into a drop inlet near station 10 +75 It This inlet will
discharge as far away from Mill Creek as reasonably possible Due to steep terrain,
it is not possible to install a preformed scour hole but we can and will install a rock
energy dissipater pad Stormwater will sheet flow from there to the creek, which is
located about 20 feet to the west No deck drains are called for in the plans There
will be no slots in the railing so all drainage will be routed to the ends of the bridge

c Topographic and nght -of -way constraints make the installation of a structural BMP
infeasible We did consider piping stormwater from the DI at station 10 +75 (It ) to
the small flat landing zone on the other side of the road It was thought that we may
have room there for at least an undersized preformed scour hole at the pipe outlet
Doing so however would increase discharge velocities due to the excessive pipe
slope needed to accomplish the task We saw no benefit to this proposal so the idea
was abandoned Roadway fill slopes will be vegetated All appropriate construction
BMPs will be employed during bridge demolition and reconstruction
d N/A The only roadside ditch associated with the project is running through a
disturbed wetland adjacent to the road The slope on this ditch line ranges between
4% - 8% which requires a rock liner per DLQ rules for stability purposes
Flattening side slopes of this ditch line would result in an increase in wetland
impacts

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