20191337 Ver 1_I-5507_HYD_SMP_20191004

i4iftay North Carolina Department of Transportation
StOCCYIWate1 Highway Stormwater Program ?a
STORMWATER MANAGEMENT PLAN
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: TIP No.: 1-5507 County(ies): Mecklenburg Page 1 of 4
General Project Information
WBS Element:
ITIP Number: 1-5507 Project Type: Roadway Widening Date: 6/7/2019
NCDOT Contact:
Malcolm Watson
Contractor / Desi ner:
I Blythe Construction/WSP Karl Dauber
Address:
1020 Birch Ridge Drive
Address:
1001 Morehead Square Drive
Raleigh, NC 27610
Suite 610
Charlotte, NC 28203
Phone:
919 707-6614
Phone:
704 342-5403
Email:
mcwatson ncdot. ov
Email:
Karl.Dauber
WS12.com
City/Town:
Charlotte
Coun ies :
Mecklenburg
River Basins :
Catawba Yadkin -Pee Dee
ICAMA County?
1 o
Wetlands within Project Limits?
Yes
Project Description
Project Length (Iin. miles or feet):
17.5 miles surrounding Land Use: Urban (residential and commercial)
Proposed Project
Existing Site
Project Built -Upon Area (ac.)
436.7 ac.
425.6 ac.
Typical Cross Section Description:
There are several cross sections for this project in the typicals provided with the Redline Drainage Plans.
There are 2 existing cross section on 485.
Essentially, the project adds toll lanes in the median. In some cases a ditch section is revised to provide
- 3 lanes each direction with a paved median from 77- to Johnston Road.
pavement. In other cases a large paved median is reduced to account for this new traffic pattern.
- Then as you travel east its is 2 lanes either direction with a variable width grassed median to US-74.
Annual Avg Daily Traffic (veh/hr/day):
Design/Future: 1592 Year: 2040
Existing: 1186 Year: 2015
General Project Narrative:
The NCDOT is widening a section of I-485 that lies within the municipal boundaries of the Cities of Charlotte and Matthews. The Design -Build Project 1-5507 / R-0211 EC / U-4714AB will provide an eastbound and
(Description of Minimization of Water
westbound Express Lane within the 1-485 median from 1-77 to US 74 (Independence Boulevard), a distance of approximately 16.6 miles. The project will also provide an 1-485 / Weddington Road interchange, and
Quality Impacts)
modify the 1-485 / East Johns Street - Old Monroe Road interchange
Impacts for R-0211EC (sheets 60, 61) Weddington Road Interchange and U-4714AB (Sheets 64,65 and 77) John Street interchange are in separate SMPs.
Construction will unavoidably impact several streams and wetlands. Where practicable, 2:1 slopes will be used to minimize impacts. Where culverts are being extended in jurisdictional streams rip rap for stabilization
is being installed on banks only.
Best Management Practices:
1 Energy Dissipation Basin and Pre Formed Scour holes at flatter outfall locations.
*Promotion of sheet flow and infiltration with grassed shoulders except were shoulder berm gutter was required.
*Drainage systems outlet to rip rap pads or riprap lined ditches.
*Removal of exiting road fill under bridges will improve conveyance and reduce velocities in bridge opening.
*Riprap on embankments was used to prevent erosion where ditches enter streams.
Waterbody Information
Surface Water Body (1):
Sugar Creek
NCDWR Stream Index No.:
11-137
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
None
Impairments:
mercury (Hg)
turbidity
fecal coliform
Aquatic T&E Species?
Comments:
NRTR Stream ID:
SCC, S11
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
iYes
I Deck Drains Discharge Over Buffer? INo
Dissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Body?
INo
I (If yes, provide justification in the General Project Narrative)
I
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)

Highway North Carolina Department of Transportation
Stormwater
Highway Stormwater Program
STORMWATER MANAGEMENT PLAN_='
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: TIP No.: 1-5507 Count ies : Mecklenburg Page 2 of 4
Additional Waterbody Information
Surface Water Body (2): McMullen Creek
NCDWR Stream Index No.:
11-137-9-5
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
None
Impairments:
mercury (Hg)
turbidity
fecal coliform
Aquatic T&E Species?
Comments:
NRTR Stream ID:
S4,S6
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
iYes
Deck Drains Discharge Over Buffer? INo
Dissipator Pads Provided in Buffer? INo
Deck Drains Discharge Over Water Body?
INo
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body (3): McAlpine Creek
NCDWR Stream Index No.:
11-137-9
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
None
Impairments:
fecal coliform
turbidity
Aquatic T&E Species?
No Comments:
NRTR Stream ID:
S3,S2,S1,SB
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
Yes
Deck Drains Discharge Over Buffer? INo
Dissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Body?
No
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body (4): Four Mile Creek
NCDWR Stream Index No.:
11-137-9-4
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
None
Impairments:
None
Aquatic T&E Species?
Comments:
NRTR Stream ID:
SD, SE, SF, SG, SSC, SAJ, SM, SBG, SSH, SBD, SAI, SAH, SAR, SV, SAE
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
Yes
Deck Drains Discharge Over Buffer? No
Dissipator Pads Provided in Buffer? N/A
Deck Drains Discharge Over Water Body?
INo
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body (5): 1 Kings Branch
NCDWR Stream Index No.:
11-137-6
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
None
Impairments:
None
Aquatic T&E Species?
No Comments:
NRTR Stream ID:
S12,SNH
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
No
Deck Drains Discharge Over Buffer? INo
Dissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Body?
No
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)

Highway North Carolina Department of Transportation
Stormwater
Highway Stormwater Program
STORMWATER MANAGEMENT PLAN_='
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: TIP No.: 1-5507 Count ies : Mecklenburg Page 3 of 4
Additional Waterbody Information
Surface Water Body (6): Flat Branch
NCDWR Stream Index No.:
11-138-3-2
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
None
Impairments:
None
Aquatic T&E Species?
No Comments:
NRTR Stream ID:
SAO,SSB, SSA
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
INo
Deck Drains Discharge Over Buffer? N/A
Dissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Body?
N/A
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body (7): 1 Six Mile Creek
NCDWR Stream Index No.:
11-138-3
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
Impairments:
None
Fish Community (Nar, AL, FW)
Aquatic T&E Species?
Comments:
NRTR Stream ID:
(SAN, SAM, SAL, SBH)
Buffer Rules in Effect:
Project Includes Bridge Spanning Water Body?
INo
I Deck Drains Discharge Over Buffer? N/A
Dissipator Pads Provided in Buffer? N/A
Deck Drains Discharge Over Water Body?
N/A
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body (8):
NCDWR Stream Index No.:
NCDWR Surface Water Classification for Water Body
Primary Classification:
Supplemental Classification:
Other Stream Classification:
Impairments:
Aquatic T&E Species?
Comments:
NRTR Stream ID:
Buffer Rules in Effect:
Project Includes Bridge Spanning Water Body?
Deck Drains Discharge Over Buffer?
Dissipator Pads Provided in Buffer?
Deck Drains Discharge Over Water Body?
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body (9):
NCDWR Stream Index No.:
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Other Stream Classification:
Impairments:
Aquatic T&E Species?
Comments:
NRTR Stream ID:
Buffer Rules in Effect:
Project Includes Bridge Spanning Water Body?
Deck Drains Discharge Over Buffer?
Dissipator Pads Provided in Buffer?
Deck Drains Discharge Over Water Body?
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)

Highway North Carolina Department of Transportation 44�
Stormwater Highway Stormwater Program°
STORMWATER MANAGEMENT PLAN
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: TIP No.: 1-5507 County ies : Mecklenburg Page 4 of 4
Preformed Scour Holes and Energy Dissipators
Sheet
No.
Station & Coordinates
(Road and Non Road
Projects)
Surface
Water Bod
Energy Dissipator
Type
Ri ra T e
Drainage
Area
ac
Conveyance
Structure
Pipe/Structure
Dimensions
(in)
010
(cfs)
V10
(fps)
BMP
Associated w/
Buffer Rules?
31
-Y2 RPD- 14+50 LT
PSH
Class'B'
1.9
Pipe
18
1.7
12.3
No
38
-L-489+50 LT
Riprap Energy
Dissipator Basin
Class 1
179.2
Culvert
6'X5' RCBC
294.0
6.0
No
Additional Comments
" Keter to the NUUU I best Management Yractices I OOIboX (LU14), N( UU I Standards, the Federal HigriWay Admmistration (F-HVVA) HydraUllC Engineering Urcular No. 14 (Fit(;-14), I hlyd Ealtlon, HyaraUlIC Ueslgn of Energy
Dissipators for Culverts and Channels (July 2006), as applicable, for design guidance and criteria.