Kewaunee Scientific - 10- Storm EX 2016-090 pond design

STATESVILLE, NC IREDELL County
n/a,
Type of application:
Initials
1
2 PSB
3 PSB
4 PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
PSB
EXISTING CONDITIONS (C0.1)
c. Dimensioned property/project boundary with bearings & distances.
EROSION CONTROL PLAN
(C4.0)
ALL SHEETS
ATTACHED PSB
Click here for Express Permitting info
New Permit
Notes / Comments
Original and one copy of this application form (all worksheets) and the permit
application fee. For applications submitted to the DEMLR regular permitting
program, the fee is $505 payable to NCDENR. For Express Review, click on the
link below for information and fee schedule. Contact the appropriate regional
office Express Review Coordinator to schedule the required pre-application
meeting.
Only complete application packages will be accepted and reviewed. A complete package includes all of the items in the checklist
below. Add any comments, and indicate the page or plan sheet number where the following information can be found. Please
indicate that you have provided the following required information by initialing in the space provided next to each item.
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
STATESVILLE, NC IREDELL County
A copy of the most current property deed.
Two copies of additional calculations (as needed). Sealed, signed and dated.
LOCATED IN CALCULATIONS
LOCATED IN CALCULATIONS
ATTACHED
Part I: Submittal Checklist
Application
Two sets of sealed, signed, & dated full-sized plans of the entire site at a
readable scale, including:
ATTACHED
A USGS map identifying the site location. If the receiving stream is reported as
class SA or the receiving stream drains to and is within 1/2 mile of SA waters,
then include the 1/2 mile radius on the map.
LANDSCAPE PLAN (C3.0)
d. The boundaries of all surface waters, regulatory flood zones, and protected
riparian buffers or a note on the plans that none exist.
b. Location map with street names and SR numbers, legend, north arrow,
scale.
SITE DETAILS (C1.1)
a. Project name, engineer and firm, revision number and dates.
N/A
d. Specifications for applicable materials, such as planting media, aggregate,
sod, underdrains, outlet devices, etc.
N/A
SITE PLAN (C1.0)
c. A table of elevations, incremental volumes and accumulated volumes (if
applicable).
a. Dimensions, side slopes, length to width ratios and elevations with a
benchmark for clean-out if appropriate.
b. All applicable conveyance devices, including: bypass structure,
pretreatment area, flow distribution device, underdrains, outlet device, outlet
dissipater and level spreader.
Two sets of sealed, signed, & dated full-sized plan details of each SCM (or
typical if appropriate) in both plan view and cross-section at a scale of 1" = 30'
or larger, including:
k. A construction sequence that shows how the SCMs will be protected from
sediment until the entire drainage area is stabilized.
GRADING PLAN (C2.0)
e. The boundaries of all vegetated or protected riparian buffers.
SITE PLAN (C1.0)
LOCATED IN CALCULATIONS
f. Site layout showing all built-upon areas, drainage features, stormwater
collection systems (inlets, outlets, swales, pipe elevations, slopes and
diameters), and SCMs at ultimate build-out.
g. Existing contours, proposed contours, spot elevations, and finished floor
elevations.
h. Existing drainage (including off-site), drainage easements, pipe sizes,
runoff calculations.
SITE DETAILS (C1.1)
Item
6
SHEET D-1 AND D-2
SITE DETAILS (C1.1)
5
i. Drainage area boundaries (included in the main set of plans, not as a
separate document).
j. Existing and proposed maintenance access routes, utility easements,
drainage easements, public rights-of-way etc.
COVER (CVR)
EXISTING CONDITIONS (C0.1)
STORM-EZ
Version 1.4 Application
11/6/2018
Page 1 of 13
STATESVILLE, NC IREDELL County
n/a,
PSB
PSB
PSB
PSB
PSB
8 PSB
9 PSB
10 PSB
11 PSB
12 PSB
LANDSCAPE PLAN (C3.0)
ATTACHED
A copy of the signed and notarized operation and maintenance (O & M)
agreement.
a. The locations of each species and a planting detail.
7
For corporations and limited liability corporations (LLC): Documentation from
the NC Secretary of State or other official documentation, which supports the
titles and positions held by the persons listed in the Contact Information section.
The corporation or LLC must be listed as an active corporation in good standing
with the NC Secretary of State, otherwise the application will be returned.
N/A
N/A
ATTACHED
NCDENR Deed Restriction Forms
ATTACHED
c. The source nursery for the plants.
b. A table summarizing the size, spacing and total quantity of each plant
species that should be used.
A copy of the lease agreement or pending sales agreement if applicable.
NC Dept. of the Secretary of State
A soils report based on field evaluation indicating the SHWT elevations within
the footprints of the proposed SCM(s). Provide a map of the boring locations
with the existing elevations and boring logs. For infiltration SCMs, the report
shall include the soil type, infiltration rate and method for determining the
infiltration rate. Soils information shall be signed and sealed by a licensed soil
scientist.
N/A
Two sealed, signed, & dated planting plans for each SCM (or typical) at a scale
of 1" = 20' or larger, as applicable, including:
N/A
LANDSCAPE PLAN (C3.0)
d. A one-time fertilizer specification to establish plants if necessary.
A copy of the proposed deed restrictions protecting the SCMs and limiting the
built-upon area so that it does not exceed the capacity of the SCM(s) or the high
density threshold (as applicable).
STORM-EZ
Version 1.4 Application
11/6/2018
Page 2 of 13
STATESVILLE, NC IREDELL County
n/a,
Date:
Lat:
Zip:Long:
County:
Project Applicant:
Owner / Signing Offical's Name:
Title:
Address:
City:
State:
Zip:
Phone:
Fax:
Email:
Status of applicant:
River Basin:
Receiving Stream(s):
Stream Class(es):
Surface Water Area (ac):Coastal wetland area (ac):
Total property area (ac):Total project area (ac):
Goals/characteristics:NO Volume Matching (LID) YES Drains to an offsite stormwater system
NO Low Density NO Within 575' of Saltwater ORW
YES High Density YES Within 5 miles of a public airport
Briefly summarize how the stormwater runoff will be treated:

Status of construction:
Other permits needed: YES Sedimentation & erosion control NO 404 Permit / 401 Certification
NO CAMA Major Permit NO Isolated Wetlands Permit
NO Threatened & Endangered Species NO NPDES Industrial Stormwater Permit
If an application for this project has been previously returned, provide the original project number and previous name of the project:
Provide the permit type, number and issue date for any permits that have already been obtained for this project:

If claiming vested rights, then identify (and attach) the supporting documents and approval dates:
NO Approval of a site-specific development plan or PUD Approval date:
NO Valid building permit Issue date:
NO Other Date:
Not Started
Point of Contact:Phone number:
6-Sep-18
IREDELL
2340 W FRONT STREET
SW3180903
Not Started
Project Name:
704-872-2411
Owner
9.9
City:
Yadkin
(from nearest intersection)
(Identify the corporation, organization, property owner, designated
government official, etc. which owns the project .)
n/a
n/a
28677
n/a
704-872-8281
NON-COASTAL
c
UT to Third Creek
[e-mail]
28625
TOM WILSON SR
STATESVILLE
NC
80-55-35
G.L. WILSON BUILDING CO.
Directions to Project:
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
35-47-32
Part III: Permit Information
ON W FRONT STREET, 1100 FEET WEST OF INTERSECTION OF W
FRONT ST AND MEACHAM RD
3.5
BMP Wet Pond
n/a
0
n/a
STATESVILLE
190 WILSON PARK RD
Project Street Address:
Part II: General Project and Applicant Information
STORM-EZ
Version 1.4 Application
11/6/2018
Page 3 of 13
STATESVILLE, NC IREDELL County
n/a,
Signing Official & Title:
Street address:
Part IV: Additional Contact Information
Complete this section if you wish to designate authority to another individual or firm so that they may provide information on your
behalf for this project (such as addressing requests for additional information).
190 Wilson Park Rd

P. Scott Bell, P.E./G.L. Wilson Building Co.
Part V: Consultant Information
Street address:
Email:
Phone number(s):
Consultant:
[e-mail]
(Note: Person/Organization noted above may be contacted for additional project information if applicant
cannot be reached.)
City, State, Zip:
Email:
Firm:
City, State, Zip:
704-872-2411 ext 252
Statesville, NC 28625
(Optional) Additional Contact
Person / Orginization:
P. Scott Bell, Senior Engineer
Part VI: Property Owner / Applicant Certification
Phone number(s):
STORM-EZ
Version 1.4 Application
11/6/2018
Page 4 of 13
1.00
1.40
1.86
2.78
3.36
4.89
5.80
6.53
7.27
Highlighted Storm is Design Storm
0.00 acres 6.02 acres
0.00 acres 60%
0.00 acres
Complete the breakdown of impervious area for the project
Yes
2-yr, 24-hr
Storm Event
10-yr, 24-hr
25-yr, 24-hr(Minimum Design Storm = P90 for non-SA, 1-yr, 24-hr for SA)
Loaded Rainfall:
0
203,541
Entire Site
Total Impervious Area
Project % impervious area
ALL AREAS ARE IN SQUARE FEET
100-yr, 24-hr
PROJECT INFORMATION
RAINFALL & CALCULATION DATA
Rainfall Source:
Project County:
Project City:
IREDELL
STATESVILLE
Charlotte
Design Storm:
Charlotte
1-yr, 24-hr
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
STATESVILLE, NC IREDELL County
Yadkin River Basin
Depth
(inches)
P90
First Flush / WQV
P90
P95
50-yr, 24-hr
Total Property Area
Total Coastal Wetlands Area
Total Surface Water Area
UT to Third Creek
c
Use Worksheet Data?
Total Drainage Area
On-Site Drainage Area (sf)
12-108-20-4
435,164
435,164
Data in italics is derived from application
forms and land use data worksheets and
cannot be changed by user.
Proposed Impervious Area (sf)
% Impervious Area (total)
0
262,416
60%
On-Site Buildings/Lots (sf)
On-Site Streets (sf)
49,783
0
Other On-Site (sf)
8,139
953
0
On-Site Parking (sf)
On-Site Sidewalks (sf)
Future (sf)
Off-site (sf)
Existing BUA (sf)
262,416Total
0
Impervious Surface Area
Offsite Drainage Area (sf)
Stream Index Number
Stream Class
Receiving Stream name
Basin Information Entire Site
NOTE: Please use the Storm-EZ calculation sheets to document the stormwater design
and create the O&M Agreement.
Discrete SCS Method,
Pre - PostCalculation Method
STORM-EZ
Version 1.4 Project Data
11/6/2018
Page 5 of 13
1 of 1
Pre-Development Land Use:
HSG CN %
B 61 53.23%
B 98 46.77%
Note: Enter BUA Draining to
Permeable Pavement Below
HSG
0.00 0.00%
0.00 0.00%
0.00 0.00%
0.00 0.00%
0.00 0.00%
9.99 46.77%
Existing Permeable Pavement (Infiltration):
Pavement Area Additional BUA
Soil
Infiltratio
n Rate
Gravel Void
Space
Total
Gravel
Depth
Orifice
Dia.
Orifice
Height
(sf) (sf) (in/hr) (%) (in) (in) (in)
100 0
DSD PAW Dgr
(in) (%) (in) (sf) (acres)
150 1.40 0.00
9.99 acres
0.00 acres
0.00 acres
0.00 acres
0.00 acres
9.99 acres
Pre-Development SCMs:
Imp. Open
(sf) (sf)
(cf) HSG 203541 231623
200 38119 B 146235 166071
Rainfall Volume =13.99 cf
Natural Infiltration & ET =-8.45 cf
Disconnected Impervious Surfaces =0.00 cf
SCM Infiltration =-0.20 cf
Permeable Pavement Infiltration =0.00 cf
Green Roof ET =0.00 cf
Post Filtration Discharge =0.00 cf
Total Runoff Reduction =-8.65 cf
Treated SCM Outflow =-1.99 cf
Untreated Surface Runoff =3.35 cf
435,164
0
0
-31,403
-30,681
0
-722
0
SCM Treatment:
acre-inches =12,150
The Pre-Development project area contains 203541 sf of built upon area, resulting in an overall density of 46.77%.
-7,216
acre-inches =
acre-inches =
acre-inches =
acre-inches =
acre-inches =
acre-inches =
BUA %
SCM #
SCM #
From Land Use Tables: 435,164
Preserved Surface Waters & Non-Coastal Wetlands :
0
Runoff Reduction Components:
acre-inches =
50,769acre-inches =
acre-inches =
Design Storm Runoff Fate Summary:
435,164
Subtotal:
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
(acres)
4.67Impervious
Pasture or Open Space 231,623
203,541
STATESVILLE, NC IREDELL County
Yadkin River Basin
PRE-DEVELOPMENT LAND USE CALCULATIONS
Drainage Area #
(sf)Land-use
5.32
Area
0
User Defined Drainage Areas:Comp.
CNDescription
Area
(ac.)Area (sf.)
Subtotal:
Area (sf.)
WQ Volume
Provided
% Imp
Drainage Area
435,164 9.99
0
Downstream
SCM
Description
Total Site Area:
Land Use Summary:
Description
Preserved Coastal Wetlands :
Notes
SCM #
Area DS SCM #
Has Synthetic
Liner?
Permeable Pavement + Additional BUA:
Green Roofs :
0
Existing Green Roofs:
HSG
SCM Type
Dry Detention
D.S.
BMP
STORM-EZ
Version 1.4 Pre-Development
11/6/2018
Page 6 of 13
1 of 1
Permeable Pavement:
Infiltration
Rate Void Space
Total
Gravel
Depth
Orifice
Dia.
Orifice
Height
(sf) (acres) (sf) (acres) (in/hr) (%) (in) (in) (in)
500 0 0.00 0.00 No
DSD PAW Dgr
(in) (%) (in) (sf) (acres)
600 1.40 0%0.00 No
Residential Lot CN Calculator (Excluding R/W and dedicated open spaces):
Max Imp / Lot Woods / Lot
(ac.) (sf) (sf)
0.00
Remaining Land Use:
HSG CN (sf) (acres) %
B 98.0 262,416 6.02 60.30%
B 61.0 172,748 3.97 39.70%
N/A 0 0.00 0.00%
N/A 0 0.00 0.00%
435,164 9.99 100.00%
Land Excluded, or Partially Excluded, from Volume Calculations:(sf.) (ac.)
0 0.00
0 0.00
435,164 9.99
Rainfall Volume =13.99 cf
Natural Infiltration & ET =-6.86 cf
Disconnected Impervious Surfaces =0.00 cf
SCM Infiltration =-0.58 cf
Permeable Pavement Infiltration =0.00 cf
Green Roof ET =0.00 cf
Post Filtration Discharge =0.00 cf
Total Runoff Reduction =-7.44 cf
Treated SCM Outflow =-5.51 cf
Untreated Surface Runoff =1.04 cf
Pre-Development Runoff =3.35 cf
Difference =-2.31 cf
Comments
Check PAW
Retrofit?
Drainage Area #
Down-
stream
SCM
Additional BUA
SCM #
Downstream
SCM #
HSG
Avg Lot Size
Pavement Area
% Imp.(sf.)
Permeable Pavement + BUA:
Sub-Total:
Green Roofs:
# of Lots
Land-Use
Open Space (Managed Open Space)
Lot Area
Impervious
Total Site Area:
Surface Waters & Non-Coastal Wetlands :
Green Roofs :
Coastal Wetlands :
acre-inches =
-2,105
0
-26,999
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
STATESVILLE, NC IREDELL County
Yadkin River Basin
Detention
Check
Has
Synthetic
Liner?
Infiltration
Check
POST-DEVELOPMENT LAND USE CALCULATIONS
Pvmt Type
SCM #
Area
Runoff Reduction Components:
Design Storm Runoff Fate Summary:
acre-inches =
acre-inches =
acre-inches =
acre-inches = -24,894
acre-inches =
0
acre-inches =
0
acre-inches =-19,996
acre-inches =
0
SCM Treatment:
3,774
acre-inches =-8,376
acre-inches =12,150
The Post-Development project area contains 262416 sf of built upon area, resulting in an overall density of 60.3%.
Area
Open Space / Lot
(sf)
50,769
acre-inches =
STORM-EZ
Version 1.4 Post Development
11/6/2018
Page 7 of 13
1 of 1
Impervious
(sf)
262,416 (cf) (cf) (cf) (cf) (cf) (cf)
700 Kewaunee SCM 1 Wet Detention B 224,197 85% 68%29450 22101 22101 2105 0 19996 71%
Rainfall Volume =13.99 acre-inches =cf
Natural Infiltration & ET =-6.86 acre-inches =cf
Disconnected Impervious Area =0.00 acre-inches =cf
SCM Infiltration =-0.58 acre-inches =cf
Permeable Pavement Infiltration =0.00 acre-inches =cf
Green Roof ET =0.00 acre-inches =cf
Post Filtration Discharge =0.00 acre-inches =cf
Total Runoff Reduction =-7.44 acre-inches =cf
SCM Treatment:
Treated SCM Outflow =-5.51 acre-inches =cf
Untreated Surface Runoff =1.04 acre-inches =cf
3.35 acre-inches =cf
-2.31 acre-inches =cf
STORMWATER CONTROL MEASURES
% of SCM
Volume
Utilized
Post
Filtration
Outflow
Treated
Outflow
Type of Device
SCM
# Name / Location
Contributing Area
HSG
Note: Large storage devices such as wet/dry detention ponds, constructed wetlands, or infiltration basins may require pond routing calculations. The routing calculations should be provided in addition to this spreadsheet.
117,247
% of Total
Impervious
Area
% of Total
Pervious
Area
Storage
Volume
Offsite Impervious
Area Treated
Infiltration &
ET
0 sf
Total
Inflow
Volume
Enter only runoff volume below that will be infiltrated or drawn down over 2 to 5 days. Additional volume provided in devices should not be entered in this worksheet.
Drawdown time requirement applies to all storm events.
Drainage Area #
PROPOSED SIPs & STRUCTURAL RUNOFF VOLUME CONTROLS
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
STATESVILLE, NC IREDELL County
Yadkin River Basin
0
117247 sf open space entered
compared to 172748 sf total
open space.
Pervious
(sf)
172,748
12,150
Warnings:
Design Storm Runoff Fate Summary:
The Post-Development project area contains 262416 sf of built upon area, resulting in an overall density of 60.3%.
0
0
**BASIC TREATMENT MET**
Difference =
Pre-Development Runoff =
-19,996
3,774
85% of total
impervious
area.
68% of total
pervious
area.
Runoff Reduction Components:
-24,894
224197 sf impervious area entered
compared to 262416 sf total impervious.
Down-
stream SCM
#
Drainage
Area Inflow
Volume
-8,376
-26,999
-2,105
0
50,769
STORM-EZ
Version 1.4 Stormwater Controls
11/6/2018
Page 8 of 13
1 of 1
Compliance Storm = P90 Storm - Rainfall Depth = 1.4 inches
Drainage Area #
FATE OF RAINFALL
Select Storm:
The"Fate of Rainfall" charts display the hydrologic processes to which rainfall volumes are subjected based on the combinations of land use, soil type, and stormwater controls entered by the user. The charts are designed to display the stormwater
plan in a form which illustrates changes to the hydrologic cycle which result from urbanization and various stormwater management strategies.
STATESVILLE, NC IREDELL County
Yadkin River Basin
P90
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
P90 Storm - Rainfall Depth = 1.4 inches
VOLUME MATCHING SCALE
Volume Matching Threshold
Basic Treatment Threshold
BASIC TREATMENT SCALE
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Infiltration and ET - 26999 cf Treated Outflow from BMPs - 19996 cf Untreated Surface Runoff - 3774 cf% of Total Rainfall VolumePost Development Fates
Post Filtration Outflow - 0 cf
Other
Infiltration by BMPs - 2105 cf
Permeable Pavement Infiltration - 0 cf
Disconnected Impervious Infiltration - 0 cf
Green Roof Evapotranspiration - 0 cf
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Infiltration and ET - 31993 cf Treated Outflow from BMPs - 13120 cf Untreated Surface Runoff - 5656 cf% of Total Rainfall VolumePre Development Fates
Post Filtration Outflow - 0 cf Other
Infiltration by BMPs - 1312 cf Permeable Pavement Infiltration - 0 cf
Disconnected Impervious Infiltration - 0 cf Green Roof Evapotranspiration - 0 cf
Infiltration and ET - 30681 cf
FATE OF RAINFALL GRAPHS
STORM-EZ
Version 1.4 Rainfall Fate Graph
11/6/2018
Page 9 of 13
1 of 1
TIME OF CONCENTRATION CALCULATIONS:
Pre-Development
Length (ft) Slope (ft/ft)Tt (hrs)
85 0.03 0.17
125 0.05 0.01
Length (ft) Slope (ft/ft) n-value
Flow Area
(ft2)Tt (hrs)
Channel Flow:
Channel Flow:
Pre-development Tc =10.98 min (Minimum 5 minutes)
Post Development
Length (ft) Slope (ft/ft)Tt (hrs)
85 0.03 0.17
125 0.05 0.01
Length (ft) Slope (ft/ft) n-value
Flow Area
(ft2)Tt (hrs)
Channel Flow:
Channel Flow:
Post-development Tc =10.98 min (Minimum 5 minutes)
ADJUSTED CURVE NUMBER CALCULATIONS:
Pre-Development
F.F. P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50-Yr 100-Yr
Rainfall (in) = 1.00 1.40 1.86 2.78 3.36 4.89 5.80 6.53 7.27
Q*(in) =0.10 0.16 0.22 0.77 1.16 2.29 3.02 3.63 4.25
CNadj =81 76 71 74 74 74 74 74 74
Post Development
F.F. P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50-Yr 100-Yr
Rainfall (in) = 1.00 1.40 1.86 2.78 3.36 4.89 5.80 6.53 7.27
Q*(in) =0.07 0.10 0.15 0.80 1.24 2.47 3.24 3.88 4.54
CNadj =79 73 68 75 76 76 76 76 76
PEAK FLOW CALCULATIONS:
F.F.P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50-Yr 100-Yr
Pre-Development
Q* (in) 0.10 0.16 0.22 0.77 1.16 2.29 3.02 3.63 4.25
qu (csm/in)363.71 363.71 363.71 607.53 607.53 743.97 743.97 743.97 743.97
Q (cfs)0.59 0.89 1.26 7.27 10.97 26.62 35.07 42.10 49.39
Post Development
Q* (in) 0.07 0.10 0.15 0.80 1.24 2.47 3.24 3.88 4.54
qu (csm/in)284.56 284.56 284.56 607.53 743.97 743.97 743.97 743.97 743.97
Q (cfs) 0.31 0.46 0.68 7.57 14.35 28.69 37.68 45.07 52.69
-47.5%-48.3%-46.0%4.1%30.9%7.8%7.4%7.1%6.7%
Analysis Area = 9.99 Acres (0.016 sq. miles)
Sheet Flow:
Shallow Flow:
Sheet Flow:
Shallow Flow:
Unpaved
Wetted Perimeter (ft)
Sheet Flow:
Note: To use a more sophisticated modeling software (TR-20,HydraFlow, Pondpack, etc) and routings to calculate peak flows for the project, remove the
storage provided in large scale BMPs from the data on the Stormwater Controls sheet, and use the adjusted Post-Development CN's listed above as the
watershed CN to generate the inflow hydrograph for each storm event. The CN may vary by storm event due to the ratio fo Connected Impervious are to
Site Area, and the impact of small scale BMPs on the anticipated runoff volume.
Shallow Flow:
**Note: To decrease Post-development peak flows - increase storage volume being drawdown or infiltrated or lengthen post-
development time of concentration. See LID HELP for more information.
Wetted Perimeter (ft)
Sheet Flow:Grass
Surface Cover
Analysis Area = 9.99 Acres (0.016 sq. miles)
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
STATESVILLE, NC IREDELL County
Shallow Flow:
Drainage Area #
Surface Cover
Grass
Unpaved
Yadkin River Basin
ADDITIONAL CALCULATIONS
STORM-EZ
Version 1.4 Peak Flow Calcs
11/6/2018
Page 10 of 13
The BMP(s) on this project include (check all that apply & corresponding O&M tables will be added automatically):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: 1 Location(s):
Present: No Location(s):
Present: No Location(s):
I,, a Notary Public for the State of
County of , do hearby certify that
personally appeared before me this day of and
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal, _____________________________________________.
A PROPOSED EXPANSION FOR KEWAUNEE SCIENTIFIC
STATESVILLE, NC IREDELL County
Operation & Maintenance Agreement
Date:
Permeable Pavement
Proprietary System
Rainwater Harvesting
Sand Filter
* Responsible Party:
Title & Organization:
Stormwater Wetland
Wet Detention Basin
Disconnected Impervious Area
Kewaunee warehouse addition
[e-mail]
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party.
Phone number(s):
Email:
Signature:
Street address:
City, state, zip:
Grassed Swale
Infiltration Basin
Infiltration Trench
Green Roof
Statesville, NC 28625
704-872-2411
Soil Amendments
Level Spreader/VFS
G.L. Wilson Building Co.
Tom Wilson, Sr.
190 Wilson Park Rd
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set
location. Any deficient BMP elements noted in the inspection will be corrected, repaired, or replaced immediately. These
deficiencies can affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the BMP(s).
Bioretention Cell
Dry Detention Basin
Cover Page
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Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if
one is provided.
Wet Detention Pond Maintenance Requirements
Important maintenance procedures:
Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the
basin should be watered twice weekly if needed, until the plants become established (commonly six weeks).
The vegetated shelf Best professional practices
show that pruning is needed
to maintain optimal plant
health.
Prune according to best professional practices
Plants are dead, diseased or
dying.
Determine the source of the problem: soils, hydrology, disease, etc.
Remedy the problem and replace plants. Provide a one-time fertilizer
application to establish the ground cover if a soil test indicates it is
necessary.
Weeds are present.Remove the weeds, preferably by hand. If pesticide is used, wipe it on
the plants rather than spraying.
The forebay Sediment has accumulated to
a depth greater than the
original design depth for
sediment storage.
Search for the source of the sediment and remedy the problem if
possible. Remove the sediment and dispose of it in a location where it
will not cause impacts to streams or the BMP.
Erosion has occurred.Provide additional erosion protection such as reinforced turf matting or
riprap if needed to prevent future erosion problems.
Weeds are present.Remove the weeds, preferably by hand. If pesticide is used, wipe it on
the plants rather than spraying.
The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or
otherwise damaged.
Replace the pipe.
Erosion is occurring in the
swale.
Regrade the swale if necessary to smooth it over and provide erosion
control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or
covered in sediment (if
applicable).
Remove sediment and replace with clean stone.
If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the
emergency drain should be minimized to the maximum extent practical.
How I will remediate the problem:
The perimeter of the BMP Areas of bare soil and/or
erosive gullies have formed.
Regrade the soil if necessary to remove the gully, and then plant a
ground cover and water until it is established. Provide lime and a one-
time fertilizer application.
Vegetation is too short or too
long.
Maintain vegetation at a height of approximately six inches.
No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to
establish the plants on the vegetated shelf.
Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention
basin.
Once a year, a dam safety expert should inspect the embankment.
Wet Detention Pond Maintenance Requirements (Continued)
After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event
greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a
known set location and must be available upon request.
BMP element: Potential problem:
The entire BMP Trash/debris is present. Remove the trash/debris.
My commission expires
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951.5 951.5
956.75 956.75
1'1'
948/950 948
Yes 947/949 947
Sediment Storage El:
Bottom El:Bottom El:Has Veg. Filter?
Pretreatment other
than forebay?No
Sediment Storage El:
Clean out depth:
Normal Pool El. Proposed Pond 1
Temporary Pool El:
Wet Detention Pond Design Summary
Normal Pool El.
Clean out depth:
The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
WET POND ID FOREBAY MAIN POND
Temporary Pool El:
The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
An annual inspection by an
appropriate professional
shows that the embankment
needs repair. (if applicable)
Make all needed repairs.
The main treatment area
The receiving water Erosion or other signs of
damage have occurred at the
outlet.
Contact the local NC Department of Environment and Natural
Resources Regional Office.
The embankment Shrubs have started to grow
on the embankment.
Remove shrubs immediately.
Evidence of muskrat or
beaver activity is present.
Use traps to remove muskrats and consult a professional to remove
beavers.
A tree has started to grow on
the embankment.
Consult a dam safety specialist to remove the tree.
Sediment has accumulated to
a depth greater than the
original design sediment
storage depth.
Search for the source of the sediment and remedy the problem if
possible. Remove the sediment and dispose of it in a location where it
will not cause impacts to streams or the BMP.
Algal growth covers over 50%
of the area.
Consult a professional to remove and control the algal growth.
Cattails, phragmites or other
invasive plants cover 50% of
the basin surface.
Remove the plants by wiping them with pesticide (do not spray).
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11/6/2018
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