20071579 Ver 1_Stormwater Info_20080422

?MCKIM&C?tEED
To: NCDENR - DWQ
2321 Crabtree Boulevard
Raleigh, NC 27699
ATTENTION: Ms. Annette Lucas
LETTER OF TRANSMITTAL
DATE: April 22, 2008
PROJECT NO: 04921-0003 TASK NO:
RE: NCCAR Stormwater Submittal
TRANSMITTAL NO:
zoo-7- r ' PAGE 1 OF 1
WE ARE SENDING: ® Originals ® Prints ? Shop Drawings ? Samples
? Specifications ® Calculations ? Other -
Quantity Drawing No. Rev. Description Status
2 Sets of plans for Stormwater Permit Package G
2 Stormwater Narrative and Supporting Calculations G
1 Stormwater Management Permit Application Form (SWU-101) G
1 Low Density Supplements (original) G
7 BMP Supplements (originals) G
11 O&M Agreements for BMP's and Amenity Pond G
1 Submittal Fee ($505) G
1 Copy of Subsurface Exploration Report by S&ME, Inc.
Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid
E. Construction F. For Review & Comments G. For Approval H. See Remarks
Action Status Code: 1. No Exceptions Taken 2. Make Corrections Noted 3. Other
4. Amend & Resubmit 5. Rejected - See Remarks
REMARKS: Annette, please find enclosed the above referenced documents. Please let us know if you need
any additional information.
Thank
200 MacKenan Court, Cary, NC 27511 919/233-8091 Fax [phone]
cc: M KIM & CREED IDA
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APR. 2, ZUU$ ?? ??
_ ATERtIUAUS"?
W
. UEN uD STORMWATER

Signed
Gareth Avant, El
DENR - ?JAT ? R GLyAUI Y???.,F1
)8F-TLANDS AND ST6RM' ER

DWQ USE ONLY 11
Date Received Fee Paid Permit Number
0'1 - lsgq
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original ® 14 4
1. GENERAL INFORMATION
APR 2 1 2008
1. Applicants name (specify the name of the corporation, individual, etc. who owns the projec% ; ANDS AW3 SmRMNiaYER VAN H
North Carolina Center for Automotive Research
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Mr. Stephen E. Margolis
3. Mailing Address for person listed in item 2 above:
310 Technology Drive
City: Gar. sy burg State:NC Zip:27831
Phone: (252 ) 534-1092 Fax: (252 ) 534-1538
Email:
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
North Carolina Center for Automotive Research
5. Location of Project (street address):
310 Technology Drive
City:Gar sag County:Northampton Zip:27831
6. Directions to project (from nearest major intersection):
From I-95 take NC-46 West, left onto Lowes Blvd, then left onto Technology Drive.
7. Latitude:36° 28' 43" N
Longitude:77° 34' 40" W of project
8. Contact person who can answer questions about the project:
Name:Gareth Avant, EI Telephone Number:
Email:gavant®mckimcreed.com
II. PERMIT INFORMATION:
1. Specify whether project is (check one): ®New ?Renewal
Form SWU-101 Version 02.19.08 Page 1 of4
9 1 233-8091
?Modification
i.,,
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
®Low Density []High Density []Redevelop []General Permit []Universal SMP []Other
4. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
?CAMA Major ®Sedimentation/Erosion Control ®404/401 Permit ?NPDES Stormwater
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
In most areas, this project qualifies as a low density development. In these areas, stormwater will be sheet flowed
by natural drainage patterns or by level spreaders. Due to the large amount of wetlands on site, several areas will
require discrete stormwater management devices.
2. Stormwater runoff from this project drains to the Roanoke River basin.
3. Total Property Area: 608.4 acres 4. Total Wetlands Area: 138.9 acres
5. 100' Wide Strip of Wetland Area: N/A acres (not applicable if no wetlands exist on site)
6. Total Project Area**:608.4 acres 7. Project Built Upon Area:17.5 %
8. How many drainage areas does the project have?11
9. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
For high density projects, complete the table with one drainage area for each engineered stormwater device.
Basin Information Drainage Area 1 Drainage Area 2
Receiving Stream Name SEE ATTACHED
Stream Class & Index No.
Total Drainage Area (so
On-site Drainage Area (so
Off-site Drainage Area (so
Existing Impervious* Area (so
Proposed Impervious*Area (so
% Impervious* Area (total)
Impervious* Surface Area Drainage Area 1 Drainage Area 2
On-site Buildings (sf)
On-site Streets (so
On-site Parking (sf)
On-site Sidewalks (so
Other on-site (so
Off-site (so
Total (so:
Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation. This is the area used to calculate percent project built upon area (BUA).
Form SWU-101 Version 02.19.08 Page 2 of 4
10. How was the off-site impervious area listed above derived? N/A
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following deed restrictions and protective covenants are required to be recorded for all subdivisions,
outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot
number, size and the allowable built-upon area for each lot must be provided as an attachment. Forms can be
downloaded from http://h2o.enr.state.nc.us/su/bml2 forms.htm - deed restrictions.
Form DRPC-1 High Density Commercial Subdivisions
Form DRPC-2 High Density Developments with Outparcels
Form DRPC-3 High Density Residential Subdivisions
Form DRPC-4 Low Density Commercial Subdivisions
Form DRPC-5 Low Density Residential Subdivisions
Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, that the covenants will be binding
on all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the
sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms. Forms can be downloaded from http://h2o.enr.state.nc.us/su/bml2 forms.htm.
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
Form SW401-Permeable Pavement
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
Permeable Pavement Supplement
Form SWU-101 Version 02.19.08 Page 3 of 4
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the
interactive online map at http://h2o.enr.state.nc.us/su/msi maps.htm)
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Original and one copy of the Stormwater Management Permit Application Form 4.45
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if A 11A
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP G4-5
• Permit application processing fee of $505 ($4,000 for Express) payable to NCDENR GIPS
• Calculations & detailed narrative description of stormwater treatment/ management Gl5
• Copy of any applicable soils report G#S
• Two copies of plans and specifications (sealed, signed & dated), including: GlfS
- Development/ Project name
- Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/ project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section. (ex. designing engineer or firm)
Designated agent (individual or firm):McKim & Creed
Mailing Address:1730 Varsity Drive, Suite 500
City:Raleigh
Phone: (919 ) 233-8091
Email:[e-mail]
State:NC
Zip:27606
Fax: (919 ) 233-8031
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) Stephen E. Margolis
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H.1000.
Signature: Date: Rec. ZO U?
Form SWU-101 Version 02.19.08 Page 4 of 4
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Permit No. ID 1) - I .S1 q
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
LOW DENSITY SUPPLEMENT
This form may be photocopied for use as an original
A low density project is one that meets the appropriate criteria for built upon area and transports stormwater
runoff primarily through vegetated conveyances. Low density projects should not have a discrete stormwater
collection system as defined by 15A NCAC 2H .1002(18). Low density requirements and density factors can be
found in 15A NCAC 2H .1005 through .1007, DWQ BMP Manual (2007), and Session Law 2006-246.
1. PROJECT INFORMATION
Project Name : North Carolina Center for Automotive Research
Contact Person: Stephen E. Margolis Phone Number: (252 )534-1092
Number of Lots:I
Allowable Built Upon Area Per Lot*:6.742,286
*If lot sizes are not uniform, attach a table indicating the number of lots, lot sizes and allowable built upon area
for each lot. The attachment must include the project name, phase, page numbers and provide area subtotals and
totals. BUA shall be shown in units of square feet.
II. BUILT UPON AREA
See the Stormwater Management Permit Application for specific language that must be recorded in the deed
restrictions for all subdivisions.
For uniform lot sizes, complete the following calculation in the space provided below where:
• SA Site Area - the total project area above Mean High Water. Wetlands may be excluded when the
development results in high density pockets.
• DF Density Factor - the appropriate percent built upon area divided by 100.
• RA Road Area - the total impervious surface occupied by roadways.
• OA Other Area - the total area of impervious surfaces such as clubhouses, tennis courts, sidewalks, etc.
• No. Lots - the total number of lots in the subdivision.
• BUA/Lot - the computed allowable built upon area for each lot including driveways and impervious surfaces
located between the front lot line and the edge of pavement.
Form SW401-Low Density-Rev.2 Page 1 of 3
IV. SWALE SYSTEM MAINTENANCE REQUIREMENTS
Mowing will be accomplished as needed according to the season. Grass height will not exceed six inches at
any time.
2. Swales will be inspected monthly or after every runoff producing rainfall event for sediment build-up,
erosion, and trash accumulation.
Accumulated sediment and trash will be removed as necessary. Swales will be reseeded or sodded
following sediment removal.
4. Eroded areas of the swales will be repaired and reseeded. Swales will be revegetated as needed and in a
timely manner based on the monthly inspections.
5. Catch basins, curb cuts, velocity reduction devices, and piping will be inspected monthly or after every
significant runoff producing rainfall event. Trash and debris will be cleared away from grates, curb cuts,
velocity reduction devices and piping.
6. Swales will not be altered, piped, or filled in without approval from NCDENR Division of Water Quality.
I acknowledge and agree by my signature below that I am responsible for the performance of the six
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print Name and Title: Stephen E. Margolis /?F.tWg ?Z6F >s OA 77,'W-<7 5
Address:310 Technology Drive, Garysburg, NC 27831
Phone:[phone] Date:
Signature:
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
I, ,?'
,,/?L?/???%0?21? , a Notary Public for the State of ytio,?T cJg?p? ?, X7'1, County of
w?.? 1z do hereby certify that 5>ir??y??, ??12G oLls personally appeared beforeme this 19TN
day of j41 k) j_ , 200 , and acknowledge the due execution of the forgoing infiltration basin maintenance
requirements. Witness my hand and official seal,
a WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
'4L
SEA
My commission expires 2- li rI
Form SW401-Low Density-Rev.2 Page 3 of 3
o1) - 1s1) q
Amenity Pond Operation and Maintenance Agreement
I will keep a maintenance record on this Pond. This maintenance record will be kept in a
log in a known set location. Any deficient items noted in this inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures and safety of the public.
The amenity pond is defined only as an amenity pond, and no water quality is provided.
Important maintenance procedures:
- Immediately after the pond is established, the plants on all slopes should be
watered twice weekly if needed, until the plants become established (commonly
six weeks).
No portion of the pond should be fertilized after the first initial fertilization that
is required to establish the plants on slopes.
Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the amenity pond.
Once a year, a dam safety expert should inspect the embankment.
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 is in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Pond element Potential Problem How I will remediate the problem:
The entire Pond Trash/debris is resent Remove the trash/debris.
The perimeter of the pond Areas of bare soil and/or erosive Regrade the soil if necessary to
gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a one-
time fertilizer application.
Water inlets Erosion is occurring at inlets Regrade if necessary to smooth earth
and provide erosion control devices
such as reinforced turf matting or
riprap to avoid future problems with
erosion.
Main Pond Body Sediment has accumulated in the Search for the source of the sediment
bottom of the pond 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
pond.
Pond element Potential Problem How I will remediate the problem:
Main Pond Body Erosion has occurred Provide additional erosion protection
such as reinforced turf matting or rip
rap if needed to prevent future
erosion roblems
Weeds are present Remove weeds, preferably by hand.
If pesticide is used, wipe it on the
]ants rather than spraying.
Algal growth covers over 50% of Consul a professional to remove and
the area. control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of the with pesticide (do not spray).
basin surface
The embankment Shrubs have begun to row Remove shrubs immediate]
Evidence of muskrat or beaver Use traps to remove muskrats and
activity is present. consult a professional to remove
beavers.
A tree has started to grow on the Consult a dam safety specialist to
embankment remove the tree.
Annual inspection by an Make all needed repairs.
appropriate professional shows
that the embankment needs repair
The receiving water Erosion or other signs of damage Contact the local NC Division of
have occurred at the pond outlet Water Quality Regional Office, or
the 401 Oversight Unit at 919-733-
1786
I acknowledge and agree by my signature below that I am responsible for the performance of the
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or
prior to any changes to the system or responsible party.
Project name: North Carolina Center for Automotive Research
Pond ID: Ameni Pond # 1- DA #I
Print name: Stephen E. Margolis
Title: Member Board of Directors
Address: 310 Technology Drive Garysburg, NC 27831
Phone:
Signatu
Date: /(J6dP4,-
Note: The legally responsible party should not be a homeowners association, unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, w G l;i -o p a Notary Public for the State of
County of do hereby certify that
T,?aNiw r A41g126-pLJ6 personally appeared before me this day of
X949 i L 2L ,5S, and acknowledge the due execution of the forgoing pond
maintenance requirements. Witness my hand and official seal,
9 WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
'( 1 ---- I--VVV ------- J
" V CrL/l?T/
SEAL
My commission expires 09" Z/- ?O?j
Permit Number: 01) - I Sol 01
(to be provided by DWQ)
Drainage Area Number:
Stormwater Wetland Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the stormwater wetland is established, the wetland plants will
be watered twice weekly if needed until the plants become established
(commonly six weeks).
- No portion of the stormwater wetland will be fertilized after the first initial
fertilization that is required to establish the wetland plants.
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- Once a year, a dam safety expert will inspect the embankment.
After the wet detention pond is established, I will inspect it 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 will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/ debris is resent. Remove the trash/ debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to
wetland erosive gullies have formed. 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 Maintain vegetation at a height of
long. approximately six inches.
The inlet device: pipe or The pipe is clogged (if Unclog the pipe. Dispose of the
swale applicable). sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the Regrade the swale if necessary to
swale (if applicable). smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Form SW401-Wetland O&M-Rev.3 Page 1 of 4
•.j ? ?
BMP element: Potential problem: How I will rernediate the problem:
The forebay Sediment has accumulated in Search for the source of the
the forebay to a depth that sediment and remedy the problem if
inhibits the forebay from possible. Remove the sediment and
functioning well. 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 a pesticide is used, wipe it
on the plants rather than spraying.
The deep pool, shallow Algal growth covers over Consult a professional to remove
water and shallow land 50% of the deep pool and and control the algal growth.
areas shallow water areas.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray) -
the deep pool and shallow consult a professional.
water areas.
Shallow land remains flooded Unclog the outlet device
more than 5 days after a immediately.
storm event.
Plants are dead, diseased or Determine the source of the
dying. 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.
Best professional practices Prune according to best professional
show that pruning is needed practices.
to maintain optimal plant
health.
Sediment has accumulated Search for the source of the
and reduced the depth to 75% sediment and remedy the problem if
of the original design depth possible. Remove the sediment and
of the deep pools. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Form SW401-Wetland O&M-Rev.3 Page 2 of 4
BMP element: Potential problem: How I will remediate the problem:
The embankment A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
The micropool Sediment has accumulated Search for the source of the
and reduced the depth to 75% sediment and remedy the problem if
of the original design depth. possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Plants are growing in the Remove the plants, preferably by
micropool. hand. If a pesticide is used, wipe it
on the plants rather than spraying.
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.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.
Form SW401-Wetland O&M-Rev.3 Page 3 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:North Carolina Center for Automotive Research
BMP drainage area number:BMP #4 - DA#9
Print name: Stephen E. Margolis
Title:Member Board of Directors
Address: 310 Technology Drive Garysburg, NC 27831
Phone:[phone]
Signature: ffjmt?
Date: APR.. zeI-
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
a Notary Public for the State of
County of r , do hereby certify that
M1gke'0is personally appeared before me this /l
day of iglgk, L , 2 vo , and acknowledge the due execution of the
forgoing stormwater wetland maintenance requirements. Witness my hand and official
seal,
WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
SEAL

My commission expires a/
1 11 Form SW401-Wetland O&M-Rev.3 Page 4 of 4

Permit No. Or) - i S / q
(to be provided by DWQ)
O?O? W A TF9QG
y
NCDENR °
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all of the required information.
Project name NCCAR
Contact person Gareth Avant, El
Phone number 919.233.8091
Date 17-Apr-2008
Drainage area number Stormwater BMP #1

Site Characteristics
Drainage area 4,317,035.00 ft2
Impervious area 1,564,313.00 ft2
% impervious 36.24 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 135,311.00 ft3
Volume provided 138,553.00 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.81 in
Rational C, pre-development 0.48 (unitless)
Rational C, post-development 0.66 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 3.85 in/hr
Pre-development 1-yr, 24-hr peak flow 24.04 ft3/sec
Post-development 1-yr, 24-hr peak flow 43.05 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 19.01 ft3/sec
Basin Elevations
Basin bottom elevation 100.00 ft
Sediment cleanout elevation 101.60 ft
Bottom of shelf elevation 106.00 ft
Permanent pool elevation 106.50 ft
SHWT elevation 107.50 ft
Top of shelf elevation 107.00 ft
Temporary pool elevation 108.65 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit No.
(to be provided by DWQ)
.." .
Volume and Surface Area Calculations
SA/DA ratio 1.30 (unitless)
Surface area at the bottom of shelf 48,849.00 ff2
Volume at the bottom of shelf 205,213.00 ft3
Permanent pool, surface area required 56,050.00 ft2
Permanent pool, surface area provided 57,304.00 ft2 OK
Permanent pool volume 231,751.00 fta
Average depth for SA/DA tables 4.04 ft OK
Surface area at the top of shelf 62,912.00 ftz
Volume at the top of shelf 261,805.00 ft3
Forebay volume 45,188.00 ft3
Forebay % of permanent pool volume 19.50 % OK
Temporary pool, surface area provided 68,620.00 ft2
Drawdown Calculations
Treatment volume drawdown time 2.10 days OK
Treatment volume discharge rate 0.51 ft3/s
Pre-development 1-yr, 24-hr discharge 24.04 ft3/s OK
Post-development 1-yr, 24-hr discharge 23.78 ft3/s OK
Additional Information
Diameter of orifice 6.5 in
Design TSS removal 85 %
Basin side slopes 3.00 :1 OK
Vegetated shelf slope 10.00 :1 OK
Vegetated shelf width 10.00 ft OK
Length of flowpath to width ratio 3.03 :1 OK
Length to width ratio 2.43 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 1.00 ft OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? (Y or N) WIU_
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies PUMP OUT
PtovrDE
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
Permit No.
(to be provided by DWQ)

Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
(cA GE 200 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
LcA 4 E.202- 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
Ge-Ar ce.76 3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
6e-4 t4 /A 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
-?_ ?- 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
g0i°t` to verify volume provided.
k 4 6rZvZ 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
CAL-/- 7. The supporting calculations.
?bL.
Gc-A t^4<_L u edP 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
Gc4 9. A copy of the deed restrictions (if required).
4k-k ING • 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 1 of 1
Permit No. 0 / _ 1 S"1 1
(to be provided by DWQ)
Op W A TF9
AWA
NCDENR °
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part ///) must be printed, filled out and submitted along with all of the required information.
Project name NCCAR
Contact person Gareth Avant, El
Phone number 919.233.8091
Date 4-Mar-2008
Drainage area number Stormwater BMP #2

Site Characteristics
Drainage area 881,416.00
ftz
Impervious area 190,224.00 ft
% impervious 21.58 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 17,939.00 ft3
Volume provided 18,344.00 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.81 in
Rational C, pre-development 0.48 (unitless)
Rational C, post-development 0.58 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 3.85 in/hr
Pre-development 1-yr, 24-hr peak flow 9.60 ft3/sec
Post-development 1-yr, 24-hr peak flow 30.02 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 20.42 ft3/sec
Basin Elevations
Basin bottom elevation 107.00 ft
Sediment cleanout elevation 108.80 ft
Bottom of shelf elevation 114.00 ft
Permanent pool elevation 114.50 ft
SHWT elevation 113.33 ft
Top of shelf elevation 115.00 ft
Temporary pool elevation 115.80 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit No
(to be provided by DWQ)

Volume and Surface Area Calculations
SAIDA ratio 1.00 (unitless)
Surface area at the bottom of shelf 9,361.00 ft2
Volume at the bottom of shelf 30,831.00 ft3
Permanent pool, surface area required 9,070.00 ft2
Permanent pool, surface area provided 11,905.00 ft2 OK
Permanent pool volume 36,147.00 ft3
Average depth for SAIDA tables 3.04 ft OK
Surface area at the top of shelf 14,196.00 ft2
Volume at the top of shelf 42,672.00 ft3
Forebay volume 6,618.00 ft3
Forebay % of permanent pool volume 18.31 % OK
Temporary pool, surface area provided 15,351.00 ft2
Drawdown Calculations
Treatment volume drawdown time
Treatment volume discharge rate
Pre-development 1-yr, 24-hr discharge
Post-development 1-yr, 24-hr discharge
Additional Information
Diameter of orifice
Design TSS removal
Basin side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build-out?
Drain mechanism for maintenance or emergencies
2.60 days OK
0.06 ft3ls
9.60 ft3ls OK
8.40 ft3ls OK
2.5 in
85 %
3.00 :1 OK
10.00 :1 OK
10.00 ft OK
3.69 :1 OK
2.57 :1 OK
Y (Y or N) OK
1.00 ft OK
Y (Y or N) OK
(Y or N) WILL PeOV IM
Y (Y or N) OK
Pk^r OccT
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
Permit N
(to be provided by DWQ)

Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
4cA GE Zoo 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
Basin dimensions,
Pretreatment system,
- High flow bypass system,
- Maintenance access,
Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
6-cA GE 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
Outlet structure with trash rack or similar,
Maintenance access,
Permanent pool dimensions,
Forebay and main pond with hardened emergency spillway,
Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
61-A ? 3. Section view of the dry detention basin (1" = 20' or larger) showing:
Side slopes, 3:1 or lower,
Pretreatment and treatment areas, and
- Inlet and outlet structures.
6 14/A 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
GCA 46r"_ 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
Ge- A- C go3 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
GGGAc.c 7. The supporting calculations.
606 K.
GLA'_ fiat ADso 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
64A- 9. A copy of the deed restrictions (if required).
GSA t.?L. 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 1 of 1
Permit Number o ` - US') 1
(to be provided by DWQ)
AWA
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WETLAND SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all the required information.
o
{
Project name NCCAR
Contact name Gareth Avant, El
Phone number 919.233.8091
Date April 17, 2008
Drainage area number BMP #4

Site Characteristics
Drainage area 171,001.00 ft2
Impervious area 89,191.00 ft2
Percent impervious 52.2%%
Design rainfall depth 1.00 inch
Peak Flow Calculations
1-yr, 24-hr runoff depth 2.81 in
1-yr, 24-hr intensity 3.85 in/hr
Pre-development 1-yr, 24-hr runoff 4.48 ft3/sec
Post-development 1-yr, 24-hr runoff 12.51 ft3/sec
Pre/Post 1-yr, 24-hr peak control 8.03 ft3/sec
Storage Volume: Non-SR Waters
Design volume (temporary pool volume) 7,402.00 ft3
Depth of temporary poollponding depth (Dpiaat) 12.00 in
Drawdown time 2.00 days
Diameter of orifice 2.00 in
Coefficient of discharge (CD) used in orifice diameter 0.60 (unitless)
calculation
Driving head (Ho) used in the orifice diameter calculation 1.00 ft
Storage Volume: SR Waters Parameters
1-yr, 24-hr depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft 3
Minimum volume required ft3
Volume provided ft 3
OK
OK
OK
Drawdown orifice diameter may be insufficient. Please
provide adequate supporting calculations.
OK
Form SW401 -Wetland-Rev. 2 Parts I and 11. Project Design Summary, Page 1 of 3
Permit Number
(to be provided by DWQ)
Surface Areas of Wetland Zones
Surface Area of Entire Wetland
Shallow Land
The shallow land percentage is:
Shallow Water
The shallow water percentage is:
Deep Pool
Forebay portion of deep pool (pretreatment)
The forebay surface area percentage is:
Non-forebay portion of deep pool
The non-forebay deep pool surface area percentage is:
Total of wetland zone areas
Add or subtract the following area from the zones
Topographic Zone Elevations
Temporary Pool
Shallow Land (top)
Permanent Pool
Shallow Water (top)
Deep Pool (top)
Most shallow point of deep pool's bottom
Deepest point of deep pool's bottom
Design must meet one of the following two options:
This design meets Option #1,
Deep pool is 6'inches below SLWT, If yes:
SLWT (Seasonally Low Water Table)
This design meets Option #2,
Has a clay liner
If yes:
Depth of topsoil above clay liner
Topographic Zone Depths
Temporary Pool
Shallow Land
Permanent Pool
Shallow Water
Deep Pool (shallowest)
Deep Pool (deepest)
Planting Plan
Are cattails included in the planting plan?
Number of Plants in planting plan recommended:
Herbacious (4'inch diameter)
Shrubs/small trees (1 gallon or larger)
Trees (1.5" dbh)
Number of Plants in planting plan provided (several species of
each plant type are recommended):
Herbacious (4'inch diameter)
Shrubs/small trees (1 gallon or larger)
Trees (2.5" dbh)
9,016.00 ft2 OK
3,319.00 ft2 OK
0.37%
3,692.00 ft 2 OK
0.41 %
1,110.00 ft2 OK
0.12%
895.00 ft2 OK
0.10%
9,016.00 ft2 OK
0.00 ft2
125.00 fmsl
124.00 fmsl
123.50 fmsl
121.50 fmsl
120.50 fmsl
Y (Y or N)
fmsl east 014 sNu/-r R - VAr VA I?ruD P1 tµ rry
ro F -:K. wrAZk.?DS , W 9 Ft et- 1M-cs p ry??
s 4PPfa-& ft rm AaO $AOK" r?wT? wAtfb?L
I•J IT AT Arta-- T A%t?S .
in
12.00 in OK
6.00 in OK
24.00 in OK
36.00 in OK
N (Y or N) OK
276
184
46
276 OK
184 OK
46 OK
Form SW401-Wetland-Rev.2 Parts I and 11. Project Design Summary, Page 2 of 3
Permit Number
(to be provided by DWQ)
Additional Information
Can the design volume be contained?
Does volume in excess of the design volume flow evenly
distributed through a vegetated filter?
What is the length of the vegetated filter?
Are calculations for supporting the design volume provided in the
application?
Is BMP sized to handle all runoff from ultimate build-out?
Is the BMP located in a recorded drainage easement with a
recorded access easement to a public Right of Way (ROW)?
The length to width ratio is:
Approximate wetland length
Approximate wetland width
Approximate surface area using length and width provided
Will the wetland be stabilized within 14 days of construction?
Y (Y or N) OK
Y (Y or N) OK
30.00 ft
Y (Y or N) OK
Y (Y or N) OK
(Y or N)
1.86:1 OK
145.00 It
78.00 ft
11,310.00 ft2 This approx. surface area is within this number of square
feet of the entire wetland surface area reported above:
Y (Y or N) OK
Form SW401-Wetland-Rev.2 Parts I and II. Project Design Summary, Page 3 of 3
Permit No.
(to be provided by DWQ)
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Initials Pagel Plan
Sheet No.
6cA F? 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Wetland dimensions (and length to width ratio),
- Pretreatment system,
Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
Boundaries of drainage easement.
Gcd GE Zo+ 2. Plan details (1" = 50' or larger) for the wetland showing:
- Wetland dimensions (and length to width ratio)
- Pretreatment system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Overflow device, and
- Boundaries of drainage easement.
GcA CE Zo+ 3. Section view of the wetland (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower
Wetland layers
All wetlands: Shallow land depth, shallow water depth, deep pool depth
Option 1, no clay liner: SLWT depth
Option 2, clay liner: Depth of topsoil on top of liner, liner specifications
&CA G6Z'>+ 4. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
A variety of suitable species (not including cattails),
Sizes, spacing and locations of plantings,
- Total quantity of each type of plant specified,
- A planting detail,
- The source nursery for the plants, and
- Fertilizer and watering requirements to establish vegetation.
GCk A 5. A construction sequence that shows how the wetland will be protected from sediment until the entire
drainage area is stabilized.
6c4 AL-e- 6. The supporting calculations (including drawdown calculations).
1500 K
GcA ,ntcc c? Pe.) 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
(<? _" I /A 8. A copy of the deed restrictions (if required).
GcAt t,j`uADW 9. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
SW401-Wetland-Rev.2 Part III, page 1 of 1
Permit No. D 1- ISO)
(to be provided by DWQ)
O?OF W AT?c9OG
y r
NCDENR °
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
Project name NCCAR
Contact person Gareth Avant, El
Phone number 919.233.8091
Date 17-Apr-2008
Drainage area number BMP #5 POND

Site Characteristics
Drainage area 430,393.00 ft2
Impervious area 297,357.00 ft2
% impervious 69.09 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 24,095.00 ft3
Volume provided 24,226.00 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.81 in
Rational C, pre-development 0.48 (unitless)
Rational C, post-development 0.82 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 3.85 in/hr
Pre-development 1-yr, 24-hr peak flow 11.28 ft3/sec
Post-development 1-yr, 24-hr peak flow 13.32 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 2.04 ft3/sec
Basin Elevations
Basin bottom elevation 118.00 ft
Sediment cleanout elevation 119.60 ft
Bottom of shelf elevation 124.00 ft
Permanent pool elevation 124.50 ft
SHWT elevation 126.50 ft
Top of shelf elevation 125.00 ft
Temporary pool elevation 125.95 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit No
(to be provided by DWQ)
ff. DEWA MFOWTM
Volume and Surface Area Calculations
SA/DA ratio 2.80 (unitless)
Surface area at the bottom of shelf 10,814.00 ft2
Volume at the bottom of shelf 36,517.00 ft3
Permanent pool, surface area required 12,210.00 ft2
Permanent pool, surface area provided 14,030.00 ftz OK
Permanent pool volume 42,728.00 ft3
Average depth for SA/DA tables 3.05 ft OK
Surface area at the top of shelf 16,647.00 ft2
Volume at the top of shelf 50,397.00 ft3
Forebay volume 8,758.00 ft3
Forebay % of permanent pool volume 20.50 % OK
Temporary pool, surface area provided 18,209.00 ft2
Drawdown Calculations
Treatment volume drawdown time 2.10 days OK
Treatment volume discharge rate 0.15 ft3/s
Pre-development 1-yr, 24-hr discharge 4.43 ft3/s OK
Post-development 1-yr, 24-hr discharge 4.23 ft3/s OK
Additional Information
Diameter of orifice 3 in
Design TSS removal 85 %
Basin side slopes 3.00 :1 OK
Vegetated shelf slope 10.00 :1 OK
Vegetated shelf width 10.00 ft OK
Length of flowpath to width ratio 3.60 :1 OK
Length to width ratio 1.85 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 3.61 ft OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? (Y or N) Wit.(_ (evV DE
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies pa,tiP 0Wr
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
Permit N
(to be provided by DWQ)
l .,. WXMD REM& CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
d,c-A GG ZOO 1. Plans (1" 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
GcA? ?-G ?S 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
GA GE 214)5 3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
6e,A - 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
41- 4 GAtc- 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
6,ow to verify volume provided.
Gt a 4. zo5 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
GGA C-Arl C- 7. The supporting calculations.
OK
(sC-A 14.1LWD 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
G C.4 At /A 9. A copy of the deed restrictions (if required).
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 1 of 1
Permit No. 1) C) - , CJ 1
(to be provided by DWQ)
ARA DOE W A TF9Q
O G
NCDENR °
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all of the required information.

Project name NCCAR
Contact person Gareth Avant, El
Phone number 919.233.8091
Date 17-Apr-2008
Drainage area number BMP #6
H. b4WN * T10N
Site Characteristics
Drainage area 1,233,932.00 ft2
Impervious area 1,048,845.00 ft2
% impervious 85.00 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 83,805.00 ft3
Volume provided 84,144.00 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.81 in
Rational C, pre-development 0.48 (unitless)
Rational C, post-development 0.88 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 3.85 in/hr
Pre-development 1-yr, 24-hr peak flow 8.45 ft3/sec
Post-development 1-yr, 24-hr peak flow 30.62 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 22.17 ft3/sec
Basin Elevations
Basin bottom elevation 113.00 ft
Sediment cleanout elevation 114.60 ft
Bottom of shelf elevation 119.00 ft
Permanent pool elevation 119.50 ft
SHWT elevation 119.50 ft
Top of shelf elevation 120.00 ft
Temporary pool elevation 121.20 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit No.
(to be provided by DWQ)
!f.' OMEN
Volume and Surface Area Calculations
SA/DA ratio 3.60 (unitless)
Surface area at the bottom of shelf 38,522.00 ft2
Volume at the bottom of shelf 156,539.00 ft3
Permanent pool, surface area required 43,810.00 ft2
Permanent pool, surface area provided 44,048.00 ft2 OK
Permanent pool volume 177,182.00 ft3
Average depth for SA/DA tables 4.02 ft OK
Surface area at the top of shelf 48,940.00 ft
Volume at the top of shelf 200,429.00 ft3
Forebay volume 36,724.00 ft3
Forebay % of permanent pool volume 20.73 % OK
Temporary pool, surface area provided 52,561.00 ft
Drawdown Calculations
Treatment volume drawdown time 2.40 days OK
Treatment volume discharge rate 0.48 ft3/s
Pre-development 1-yr, 24-hr discharge 8.45 ft3/s OK
Post-development 1-yr, 24-hr discharge 6.62 ft3/s OK
Additional Information
Diameter of orifice 5 in
Design TSS removal 85 %
Basin side slopes 3.00 :1 OK
Vegetated shelf slope 10.00 :1 OK
Vegetated shelf width 10.00 ft OK
Length of flowpath to width ratio 3.13 :1 OK
Length to width ratio 2.83 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 3.03 ft OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? (Y or N) W i(.c.-
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies F(A X% P pwT
PQd U 10E
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
Permit No
(to be provided by DWQ)
i.ISPlease indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
6c-Ar GE 200 1. Plans (1" 50' or larger) of the entire site showing:
Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
Basin dimensions,
- Pretreatment system,
- High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW),
- Overflow device, and
Boundaries of drainage easement.
Gc.Arr GC Zeta 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
Outlet structure with trash rack or similar,
- Maintenance access,
Permanent pool dimensions,
Forebay and main pond with hardened emergency spillway,
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
&cA e-e- 3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
64A 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
!.C A 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
g°Oe` to verify volume provided.
Gc k GZo 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
Gtr c.c. 7. The supporting calculations.
6ooK
GG4 cua 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
Gck 9. A copy of the deed restrictions (if required).
6e-A ,4 e-. 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 1 of 1
kG 'I "I
Permit No. 1
(to be provided by DWQ)
O?O? W ATLC9QG
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
t 47INP WTION
Project name NCCAR
Contact person Gareth Avant, El
Phone number 919.233.8091
Date 17-Apr-2008
Drainage area number BMP #7

Site Characteristics
Drainage area 630,043.00 ftz
Impervious area 495,265.00 ftz
% impervious 78.61 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 39,770.00 ft3
Volume provided 41,113.00 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.81 in
Rational C, pre-development 0.48 (unitless)
Rational C, post-development 0.86 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 3.85 in/hr
Pre-development 1-yr, 24-hr peak flow 8.45 ft3/sec
Post-development 1-yr, 24-hr peak flow 20.90 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 12.45 ft3/sec
Basin Elevations
Basin bottom elevation 118.00 ft
Sediment cleanout elevation 119.40 ft
Bottom of shelf elevation 123.00 ft
Permanent pool elevation 123.50 ft
SHWT elevation 120.50 ft
Top of shelf elevation 124.00 ft
Temporary pool elevation 125.15 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit No
(to be provided by DWQ)

Volume and Surface Area Calculations
SA/DA ratio 3.30 (unitless)
Surface area at the bottom of shelf 17,055.00 ft2
Volume at the bottom of shelf 55,895.00 ft3
Permanent pool, surface area required 20,750.00 ft2
Permanent pool, surface area provided 21,345.00 ft2 OK
Permanent pool volume 65,495.00 ft3
Average depth for SA/DA tables 3.07 ft OK
Surface area at the top of shelf 24,597.00 ft
Volume at the top of shelf 76,980.00 ft3
Forebay volume 12,000.00 ft3
Forebay % of permanent pool volume 18.32 % OK
Temporary pool, surface area provided 26,933.00 ft
Drawdown Calculations
Treatment volume drawdown time 2.50 days OK
Treatment volume discharge rate 0.23 ft3/s
Pre-development 1-yr, 24-hr discharge 6.01 ft3/s OK
Post-development 1-yr, 24-hr discharge 5.90 ft3/s OK
Additional Information
Diameter of orifice 3.5 in
Design TSS removal 85 %
Basin side slopes 3.00 :1 OK
Vegetated shelf slope 10.00 :1 OK
Vegetated shelf width 10.00 ft OK
Length of flowpath to width ratio 3.13 :1 OK
Length to width ratio 3.03 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 2.73 ft OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? (Y or N) wiL%- F," V i P s
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies pant i> 0 11rr
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
Permit
(to be provided by DINQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
eA C E Zoo 1. Plans (1" 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Basin dimensions,
Pretreatment system,
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW),
Overflow device, and
Boundaries of drainage easement.
Gc G r- 7.o-7 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
Outlet structure with trash rack or similar,
Maintenance access,
Permanent pool dimensions,
Forebay and main pond with hardened emergency spillway,
Basin cross-section,
Vegetation specification for planting shelf, and
Filter strip.
4e-As 1C E2-07 3. Section view of the dry detention basin (1" = 20' or larger) showing:
Side slopes, 3:1 or lower,
Pretreatment and treatment areas, and
Inlet and outlet structures.
6c 4 N 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
Gc.A Gau- SoOfL 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
ce-A LEZ07 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
Gc A, C LC_ 7. The supporting calculations.
$300 V_
ae-A, I,.!?O 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
cA 9. A copy of the deed restrictions (if required).
&Z-A- &D 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basi n-Rev.4 Part III. Required Items Checklist, Page 1 of 1
Permit Number: O 1 - , C-)*) `
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/ debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The Swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:North Carolina Center for Automotive Research
BMP drainage area number:DA #3
Print name: Stephen E. Margolis
Title:Member Board of Directors
Address:310 Technology Drive Garysburg, NC 27831
Phone:[phone]
Signature: i67
Date:-, 41 -, 0 e, 00c) r
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, Wi4i- oi/_ /2 a Notary Public for the State of
N/o?1 T? Ctl?2„Li, v?9 , County of rvdQK 1? , do hereby certify that
Sy???l??w /5. ?r?g/LGOL?t personally appeared before me this
day of 1 1?2)L , Z ooh , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
^W '? WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
SEAL ?????"?
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Permit Number: Or) - IS 7 _ `
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
® does r_1 does not incorporate a vegetated filter at the outlet.
This system (check one):
? does ® does not incorporate pretreatment other than a forebay.
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).
- 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.
- 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.
- Once a year, a dam safety expert should inspect the embankment.
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.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/ debris is resent. Remove the trash/ debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin erosive gullies have formed. 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 Maintain vegetation at a height of
long. approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 1 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
swale sediment off-site.
The pipe is cracked or Replace the pipe,
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. 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 vegetated shelf Best professional practices Prune according to best professional
show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. 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 main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
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.
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 401 Oversight Unit at 919-733-
1786.
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.
When the permanent pool depth reads 4.1 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 2.5 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
ill in the blanks)
Sediment Removal
Bottom
0 Permanent Pool Elevation 123.50
121.00 YPe anen Po ol
----------------olume Sediment Removal Elevation 119.40 Volume
120.00 Min. ------------------------------------ediment Bottom Elevation 118.00 1-ft r
Storage Sedimei
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:North Carolina Center for Automotive Research
BMP drainage area number:BMP #7 - DA#y2$ bcA
Print name: Stephen E. Margolis
Title:Member Board of Directors
Address:310 Technology Drive Garysburg, NC 27831
Phone
Signat
Uate: HFW'VC (! --C VC-16
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, w?9? X122 f3 , ,C ?/%rJ?21? , a Notary Public for the State of
County of 1411,q /C) 7- , do hereby certify that
A14i-GaGIS personally appeared before me this 1 '/ rX
day of 191X,) L ,Zoo k , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
SEAL
My commission expires (f)
Form SW401-Wet Detention Basin O&M-Rev.3 Page 4 of 4
Permit Number: 0 r) ` 15 1 01
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
® does ? does not incorporate a vegetated filter at the outlet.
This system (check one):
? does ® does not incorporate pretreatment other than a forebay.
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).
- 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.
- 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.
- Once a year, a dam safety expert should inspect the embankment.
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.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/ debris is resent. Remove the trash/ debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin erosive gullies have formed. 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 Maintain vegetation at a height of
long. approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 1 of 4
;- ? ff ? - ?
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. 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 vegetated shelf Best professional practices Prune according to best professional
show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying, 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 main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will rernediate the problem:
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
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.
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 401 Oversight Unit at 919-733-
1786.
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.
When the permanent pool depth reads 3.25 feet in the main pond, the
sediment shall be removed.
When the permanent pool depth reads 2.5 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
ill in the blanks)
0 Permanent Pool Elevation 106.5
Sediment Removal . 104.0 YPe anen Po ol
- - - - - - - - - - - - - - - olume Sediment Removal Elevation 103.25 Volume
Bottom Elevatio 103.0 Min.
-------------------------------------------- ediment Bottom Elevation 102 1-ft n
Storage Sedimer
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:North Carolina Center for Automotive Research
BMP drainage area number:BMP #1 - DA#10
Print name: Stephen E. Margolis
Title:Member, Board of Directors
Address:310 Technology Drive Garysburg, NC 27831
Phone:[phone]
Signat;4C ?•
Date: "17
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
a Notary Public for the State of
ti/?i27t! Gt92oLwvl9 , County of w/gl?y , do hereby certify that
39i /°/2?rz`v ?i !ter ?l?Go s personally appeared before me this./ 'y If/
day of &dkj L Zook , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
SEAL IZI? ?

My commission expires o t/ z9/a q
Form SW401-Wet Detention Basin O&M-Rev.3 Page 4 of 4
Permit Number: O 1) ' S 1 I
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will rernediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/ debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
.,
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip,
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:North Carolina Center for Automotive Research
BMP drainage area number:DA #8
Print name:Stephen E. Margolis
Title:Member, Board of Directors
Address:310 Technology Drive Gar ssburg, NC 27831
Phone:
Signati

Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
a Notary Public for the State of
County of do hereby certify that
S ri??Xi?`v lam . 1411412 1_ /S personally appeared before me this 1 ??tl
day of > L , Z dc, !?/ , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
WALTER B. BYFORD
STATE OF NORTH CAROLINA
tlWAKE COUNTY
SEAL
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Permit Number: 0 r) ' I S 1 R
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will rernediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged, of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will rernediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed, remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:North Carolina Center for Automotive Research
BMP drainage area number:DA #9
Print name: Stephen E. Margolis
Title:Member Board of Directors
Address:310 Technology Drive Gar ssburg, NC 27831
Phone
Signa
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
a Notary Public for the State of
?ZZ t I G 1?120L? ?? , County of W,?, ij , do hereby certify that
1? Iz , y4 f9?2 LD L IS personally appeared before me this _LZrN
day of n1o 4 ? L 2 Da , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
SEAL
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Permit Number: .0 el IS I
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/ debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:North Carolina Center for Automotive Research
BMP drainage area number:DA #10
Print name:Stephen E. Margolis
Title:Member Board of Directors
Address:310 Technology Drive Garysburg, NC 27831
Phone:[phone]
Signature:
Date: ?? / 7i ,ZorJ?'
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, 1ti?9?11yZ, Qs//%D/? J7 , a Notary Public for the State of
ti??ttl Cl?P26L??>+9 , County of do hereby certify that
ST ??° 1? iz w l= , 14'1LqA G aL 1S personally appeared before me this L2 r1l
day of ?1/°l I L , Z do , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
WALTER B. BYFORD
STATE OF NORTH CAROLINA
WAKE COUNTY
SEAL
-v
y
My commission expires 61"z
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3