SW8050427_CURRENT PERMIT_20220209

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 05 OL4 2 n
DOC TYPE]
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
2 o 2 2 02 o�i
YYYYMMDD

- ROY COOPER
'Covm�or= .
EMABETH S. BISER
BiZJM VVRENN
Director •. -.
February 9, 2022
-River Ventures; LLC
: Attn: Christopher Filoy, Executive Vice President
929 North Front Street
Wilmington, NC 28401
Subject: Permit Renewal
Post=Co'nstraction Stormwater Management Permit No. SW8 050427
PPD Parking Garage
New Hanover County
Dear Mr. Fikry:
Effective August 1, 2013 the Post -Construction Stormwater Management Program has been transferred from the
Division of Water-Quality(`�WQ") to the Division of Energy; Mineral and Land Resources (" DEMLR ). All
previous references to DWQ will remain in oldei. ii its issued prior to August 1,-2013 until theyare modified.'
Please note that_this `permit will now reference DiMWR as the Division_ responsible for enforcement of the permit.
On August 5,-2009,-the Governor signed -Session Law 2009=406. This lawimpacted any: development approval
issued_ by the'foimer-Division of Water Quality under Article 21 of Chaptei 143 of the General Statute's; which -
was current and valid at any point between 3aiivary 1, 2008; and Decembei31, 2010. The law eictended the
.effective period of any permit that was set to expire during this time -frame to three (3) years from its current
expiration date. OnAugust 2, 2010, the;Gov6m6r signed Session Law 2010-177, which granted an extra year for
a total of four (4) years extension.,,
The Division of Energy, Mineral and Land Resources received a complete 8-year Permit Renewal Application for
the subject permit on February 8, 2022: ,The Divisior is hereby notifying you that permit SW80504027 has'been'`
,renewed :updated and re -issued on February 9, 2022, as attached. As requested -a copy of the current operation_
and maintenance agreement is also enclosed. Please 6e aware that the renewal and re-issuanca'of this stoiinwatei
permit does not imply that,the site is currently incompliance.
This permit shall be effective unti 'February 21, 2028,.whioh includes all available extensions;:and 'does not
supersede any other agency permit that may lie required. The project shall be subject to the conditions and
limitations as specked therein. This permit does not impose new or increased'stormwater:control requirements; i(
clarifies the riles and requirements of this program to.provide' you, with a better understanding of yo`ui obligations
under this permit: Failure.to comply with these requirerrrents will,result in future' compliance problems.:,Please.
note-thit.this.permit is not trahsferable e'kcept after notice to and approval by the Division.
If any parts, requirements,- or limitations contained in this permit areunacceptable; you have the right to request
an adjud1.icatory hearing'by;filing'a writte i petition with the Office:of Administrative Hearings'(OAH): The_;
written petition must conform to Chapter.150B of the.North Carolina General Statutes and must be filed with the
OAHLwithin thirty(30) days` of receipt of this permit..You should contact the OAH with'all guestions regarding
the filing fee:(if a filing fee is required) and/or,the details of the filing process at 6114 Mail Service Center, s
Raleigh, NC 27699-6714, or via telephone at 919431-3000;.or visit their website at www.NCOAH.com. Unless
such demands are made this permit shall be final and binding.
If you have any questions concerning this'permit, please contact Ashley Smith in the. Wilmington Regional.
--Office; at (910) 796=7215 or ashl' smith@rcdenr:gov.
Sincerely,
Brian Wrenn, Director
Division of Energy, Mineral and Land Resources
- North Carolina Doartment of Envimnunental Quarity I Division of rnergy, Afineral and land Resources
_ Wilmington Regional Office 1 127 Card -oral Drive Extension I wilrningtom Nohh,Carolina 28465
xam w

State Stormwater Permit No. SW8 050427
Page 2 of 2
- Encloslues: Attachment A - Designer's Certification Form
AttactiroentC=Permit[itg"History
Renewal Application Documents
Copy'of the ctinent operation and maintenance agreement - - -
DES/airs: \\\Storm*ater\Permits & Projects\2005\050427 HD\2022 02 permit 050427
cc: WOtnington Regional Office Stormwater File -
North Carolina Departricent of Environmental Quarry I DNfslon of Energy, Mineral and Land Resources
E� Wi�n Regional Office 11Z7 Card nal Drive Extension I Wilmmgton.North Carolina Za405
io.rq� 910.7%.7215

Post -Construction Stormwater Management
Permit No SW8 050427
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL AND LAND RESOURCES
POST -CONSTRUCTION STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
River Ventures, LLC
PPD Parking Garage (formerly North Riverfront Parking Garage)
155 Brunswick Street, Wilmington, New Hanover County
FOR THE
construction, operation and maintenance of an underground infiltration trench in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and as outlined in
the application, approved stormwater management plans, supplement, calculations, operation and
maintenance agreement, recorded documents, specifications, and other supporting data (the
"approved plans and specifications") as attached and/or on file with and approved by the Division of
Energy, Mineral and Land Resources (the "Division" or "DEMLR"). The project shall be constructed,
operated and maintained in accordance with these approved plans and specifications. The approved
plans and specifications are incorporated by reference and are enforceable part of this permit
This permit shall be effective from the date of issuance until February 21, 2028 and shall be subject to
the following specified conditions and limitations. The permit issued shall continue in force and effect
until the permittee files a request with the Division for a permit modification, transfer, renewal, or
rescission; however, these actions do not stay any condition. The issuance of this permit does not
prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or
terminating the permit for cause as allowed by the laws, rules, and regulations contained in Title 15A
NCAC 2H.1000 and NCGS 143-215 1 et.al.
I. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater described in
the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as
described in Section 1.6 on page 2 of this permit. The stormwater control has been designed to
handle the runoff from 65,679 square feet of impervious area. This trench is designed for a 2-
inch storm event and stormwater in excess of the 2-inch event bypasses the trench and
discharges to the City stormwater system.
3. The tract will be limited to the amount of built -upon area indicated on page 2 of this permit, and
per approved plans. There is no allotment for future built -upon area at the site.
4. All stormwater collection and treatment systems must be located in either dedicated common
areas or recorded easements. The final plats for the project will be recorded showing all such
required easements, in accordance with the approved plans.
Page 1 of 7

Post -Construction Stormwater Management
Permit No. SW8 050427
5. The runoff from all built -upon area within the permitted drainage area of this project must be
directed into the permitted stormwater control system.
6. The following design criteria have been provided
in the infiltration trench and must be
maintained at design condition.
a. Drainage Area, acres:
1.51
Onsite, ft2:
65,679
Offsite, ft2:
none
b. Total Impervious Surfaces, ft2.
65,679
C. Design Storm, inches:
2.0
d. Trench Dimensions, L x W x H, ft:
North:
85 x 37 x 4.33
South:
125 x 31 x 4.33
e. Number of StormChamberTM units:
145 at 115 ft3 each
f. Bottom Elevation, NGVD:
22.0
g. Bypass Weir Elevation, NGVD:
26.33
In. Permitted Storage Volume, ft3:
18,000
i. Type of Soil:
Sand
J. Expected Infiltration Rate, in/hr:
9.1
k. Seasonal High Water Table, NGVD
20
I. Time to Draw Down, hours:
2 1
M. Receiving Stream/River Basin:
Cape Fear River / Cape Fear
n. Stream Index Number:
18-74-(61)
o. Classification of Water Body:
"SC; Sw"
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in its entirety, vegetated and
operational for its intended use prior to the construction of any built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the system
will be repaired immediately.
3. The permittee shall at all times provide the operation and maintenance necessary to assure
the permitted stormwater system functions at the design condition The approved Operation
and Maintenance Plan must be followed in its entirety and maintenance must occur at the
scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Immediate repair of eroded areas.
d. Maintenance of all slopes in accordance with approved plans and specifications.
e. Debris removal and unclogging of bypass structure, filter media, flow spreader, catch
basins, and piping.
f. A clear access path to the bypass structure must be available at all times.
g. No chemicals added to the solution for pressure -washing surfaces.
Records of maintenance activities must be kept and made available upon request to
authorized personnel of DEMLR. The records will indicate the date, activity, name of person
performing the work and what actions were taken.
The facilities shall be constructed, operated and maintained in accordance with the provisions
of this permit, the approved plans and specifications, and the supporting documents attached
to this permit and on file with the Division.
Page 2 of 7

Post -Construction Stormwater Management
Permit No SW8 050427
6. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to
operation of this permitted facility, a certification must be received from an appropriate
designer for the system installed certifying that the permitted facility has been installed in
accordance with this permit, the approved plans and specifications, and other supporting
documentation. Any deviations from the approved plans and specifications must be noted on
the Certification. A modification may be required for those deviations
7. If the stormwater system was used as an Erosion Control device, it must be restored to design
condition prior to operation as a stormwater treatment device, and prior to occupancy of the
facility.
8. Access to the stormwater facilities shall be maintained via appropriate easements at all times.
9. The Director may notify the permittee when the permitted site does not meet one or more of
the minimum requirements of the permit. Within the time frame specified in the notice, the
permittee shall submit a written time schedule to the Director for modifying the site to meet
minimum requirements. The permittee shall provide copies of revised plans and certification in
writing to the Director that the changes have been made.
10. No person or entity, including the permittee, shall alter any component shown in the approved
plans and specifications Prior to the construction of any modification to the approved plans,
the permittee shall submit to the Director, and shall have received approval for modified plans,
specifications, and calculations including, but not limited to, those listed below For changes to
the project or SCM that impact the certifications, a new or updated certification(s), as
applicable, will be required and a copy must be submitted to the appropriate DEQ regional
office upon completion of the modification.
a. Any modification to the approved plans and specifications, regardless of size including
the SCM(s), BUA, details, etc.
b. Redesign or addition to the approved amount of BUA or to the drainage area.
C. Further development, subdivision, acquisition, lease or sale of any, all or part of the
project and/or property area as reported in the approved plans and specifications.
d. Altering, modifying, removing, relocating, redirecting, regrading, or resizing of any
component of the approved SCM(s), the stormwater collection system and/or
vegetative conveyance shown on the approved plan.
e. The construction of any allocated future BUA.
f. The construction of any permeable pavement, #57 stone area, public trails, or
landscaping material to be considered a permeable surface that were not included in
the approved plans and specifications.
g. Other modifications as determined by the Director.
III. GENERAL CONDITIONS
1. CORRECTIVE ACTIONS REQUIRED If the facilities fail to perform satisfactorily, the
permittee shall take immediate corrective actions This includes actions required by this
Division and the stormwater rules such as the construction of additional or replacement on -site
stormwater systems. These additional or replacement measures shall receive a permit from
the Division prior to construction.
2. PERMIT RENEWAL. A permit renewal request must be submitted at least 180 days prior to
the expiration date of this permit The renewal request must include the appropriate
application, documentation and the processing fee as outlined in Title 15A NCAC
02H 1045(3).
3. CHANGES TO THE PROJECT NAME, PERMITTEE NAME OR CONTACT INFORMATION.
The permittee shall submit a completed Permit Information Update Application Form to the
Division within 30 days to making any one of these changes.
Page 3 of 7

Post -Construction Stormwater Management
Permit No. SW8 050427
4. TRANSFER. This permit is not transferable to any person or entity except after notice to and
approval by the Director. Neither the sale of the project and/or property, in whole or in part, nor
the conveyance of common area to a third party constitutes an approved transfer of the permit.
a. TRANSFER REQUEST The transfer request must include the appropriate application,
documentation and the processing fee as outlined in 15A NCAC 02H.1045(2). This
request must be submitted within 90 days of the permit holder meeting one or more of
the following:
i. A natural person who is deceased,
ii. A partnership, limited liability corporation, corporation, or any other business
association that has been dissolved,
iii. A person or entity who has been lawfully and finally divested of title to the
property on which the permitted activity is occurring or will occur through
foreclosure, bankruptcy, or other legal proceeding.
iv. A person or entity who has sold the property, in whole or in part, on which the
permitted activity is occurring or will occur.
b. TRANSFER INSPECTION. Prior to transfer of the permit, a file review and site
inspection will be conducted by Division personnel to ensure the permit conditions
have been met and that the project and the on -site stormwater system complies with
the permit conditions. Records of maintenance activities performed to date may be
requested. Projects not in compliance with the permit will not be transferred until all
permit and/or general statute conditions are met.
5. COMPLIANCE. The permittee is responsible for compliance with the terms and conditions of
this permit until the Division approves the transfer request.
a APPROVED PLANS AND SPECIFICATIONS. A copy of this permit, approved plans,
application, supplement, operation and maintenance agreement, all applicable
recorded documents, and specifications shall be maintained on file by the permittee at
all times
b. DIVISION ACCESS. The permittee grants Division Staff permission to enter the
property during normal business hours to inspect all components of the permitted
project.
C. ENFORCEMENT. Any individual or entity found to be in noncompliance with the
provisions of a stormwater management permit or the requirements of the stormwater
rules is subject to enforcement procedures as set forth in NCGS 143 Article 21.
d. ANNUAL CERTIFICATION. The permittee shall electronically submit to the Division an
annual certification completed by either the permittee or their designee confirming the
projects conformance with permit conditions
e. OBTAINING COMPLIANCE The Director may notify the permittee when the permitted
site does not meet one or more of the minimum requirements of the permit. Within the
time frame specified in the notice, the permittee shall submit a written time schedule to
the Director for modifying the site to meet minimum requirements. The permittee shall
provide copies of modified plans and certification in writing to the Director that the
changes have been made.
f. OTHER PERMITS. The issuance of this permit does not preclude the permittee from
complying with and obtaining any other permits or approvals that are required for this
development to take place, as required by any statutes, rules, regulations, or
ordinances, which may be imposed by any other Local, State or Federal government
agency having jurisdiction. Any activities undertaken at this site that cause a water
quality violation or undertaken prior to receipt of the necessary permits or approvals to
do so are considered violations of NCGS 143-215.1, and subject to enforcement
procedures pursuant to NCGS 143-215.6.
Page 4 of 7

Post -Construction Stormwater Management
Permit No. SW8 050427
Permit renewed, updated and reissued this the 9th day of February 2022.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
. nan Wrenn, Director
Division of Energy, Mineral and Land Resources
By Authority of the Environmental Management Commission
Page 5 of 7

Post -Construction Stormwater Management
Permit No SW8 050427
PPD Parking Garage (formerly North Riverfront Parking Garage)
Stormwater Permit No. SW8 050427
New Hanover County
Attachment A
Designer's Certification
I, , as a duly registered in the
State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the
construction of the project,
(Project)
for (Project Owner) hereby state that, to the best
of my abilities, due care and diligence was used in the observation of the project construction
such that the construction was observed to be built within substantial compliance and intent
of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
SEAL
Page 6 of 7

Post -Construction Stormwater Management
Permit No. SW8 050427
Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage.
2. The drainage area to the system contains no more than the permitted amount
of built -upon area.
3. All the built -upon area associated with the project is graded such that the runoff
drains to the system.
4. All roof drains are located such that the runoff is directed into the system.
5. The bypass structure elevations are per the approved plan.
6. The bypass structure is located per the approved plans.
7. A Trash Rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-circuiting
of the system.
11. The permitted amounts of surface area and/or volume have been provided.
12. All required design depths are provided.
13. All required parts of the system are provided.
14. The required system dimensions are provided per the approved plans.
cc: NCDEQ-DEMLR Wilmington Regional Office
New Hanover County Building Inspections
Page 7 of 7

Attachment C - Permitting History
PPD Parking Garage
Permit No. SW8 050427
Approval
Date
Permit Action
BIMS
Version
Description of the Changes
5/23/2005
Original
Approval
1.0
changing the permittee from City of Wilmington, Sterling
B. Cheatham, City Manager to River Ventures, LLC, Fred
Davenport, Jr., Vice President; changing the project name
from North River -front Parking Garage to PPD Parking
2/21/2006
Modification
1.1
Garage; reducing the drainage area and impervious area,
each previously 67,340 sq ft, to 65,679 sq ft each;
modifying the infiltration trench system configuration and
increasing the number of StormChamberTM units from 80
to 145 at 115 f13 of design storage each.
2/9/2022
Renewal
2.0
Expires February 21, 2028

DEMLR USE ONLY
Date Received
Fee Paid
i Permit Number
I Zt.o 2022
L40003g8 to8 50
2"l
NC DEQ Division of Energy, Mineral and Land Resources
STATE STORMWATER:
PERMIT RENEWAL APPLICATION FORM
In accordance with 15A NCAC 2H.1045(3), the current permit holder shall renew their high density permit 180 days
prior to its expiration. Renewed permits are valid for a period of 8 years per Session Law 2011-398 (SB 781)
Section 60. (c). This application form is for permit renewals only.
A. PROJECT INFORMATION
1. State Stormwater Permit Number. SW8 050427
2. Protect name: PPD Parking Garage
3. Protect street address 155 Brunswick Street
City: Wilmington County: New Hanover
ZIP: 28401
4. What, if any, changes have been made to the project as permitted?
If the project has changed from the original approved plans, please complete SWU-101 for a Major
Modification or Minor Modification Application form available at: https://deg.nc.gov/abouUdivisions/energy-
mineral-land-resources/energy-mineral-la nd-rules/stormwater-program/post-construction.
B. PERMITTEE INFORMATION
If changes to the permittee or project name have been made, please complete either the Permit Update form
or the Permit Transfer form available at https://deg.nc.gov/abouUdivisions/energv-mineral-land-
resources/energv-mineral-land-rules/stormwater-program/post-construction. State Stormwater Permits do not
automatically transfer with the sale of the property.
1. Current Permit Holder's Company Name/Organization: River Ventures, LLC
2. Signing Official's Name. Henry W. Gerock, III
3. Signing Official's Title. Assistant Secretary
4. Mailing Address: 929 North Front Street
City: Wilmington State: NC ZIP: 28401
5. Street Address: 929 North Front Street
City: Wilmington State: NC ZIP : 28401
6 Phone:( 910 ) 251-0081 Email hank.gerockCa)ppd.com
Stormwater Permit Renewal Form Page 1 of 3 May 11, 2018

C. SUBMITTAL REQUIREMENTS
Submit the application package to the appropriate DEMLR Regional Office (Coastal, SA Waters) or DEMLR
Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal HQ W/ORM. Only applications packages that
include all required items listed below will be accepted and reviewed.
Initial each item below to indicate that the required information is provided in the application package:
X 1 A permit application processing fee of $505.00 payable to NCDEQ.
X 2. One original signed hard copy and one electronic copy of this completed form. The signing official
named on this application to represent the current permittee must meet one of the following:
a. Corporation — a principle executive officer of at least the level of vice-president,
b. Limited Liability Company (LLC) — a manager or company official as those terms are defined
in G.S. 57D "North Carolina Limited Liability Company Act;"
c. Public Entity — a principal executive officer, ranking official, or other duly authorized employee;
d. Partnership or limited partnership — the general partner;
e. Sole proprietor; or
f. Letter of authorization signed by one of the signatories noted in a — e above authorizing the
signature of another entity.
3. One hard copy and one electronic copy of recorded documents required by the original permit that
have not yet been received by DEMLR, including: deed restrictions, protective covenants,
condominium/planned community declaration and easements. If the project has been built, include
documentation that the maximum BUA per lot or maximum total BUA has not been exceeded. If
the project has not been built, include a signed agreement that the final recorded deed restrictions
and protective covenants will be submitted at a later date.
X 4. O&M Agreements, Please select one.
❑ I have a copy of the current recorded O&M Agreement for all SCMs, and I will continue to
keep this on file with the permit; or
® I do not have a copy of the current recorded O&M Agreement for all SCMs and am
requesting a copy be sent to me. I agree to keep this on file with the permit.
5. Designer Certifications, Please select one:
❑ A copy of the certification(s) confirming that the project was built in accordance with the
approved plans have been previously provided to the Division; or
❑ A copy of the certification(s) confirming that the project was built in accordance with the
approved plans are enclosed; or
❑ The project has not yet been built.
6. [IF APPLICABLE] If the project has been built, one original hard copy and one electronic copy of a
signed, sealed, and dated letter from a licensed professional stating that the SCMs have been
inspected, and that they have been built and maintained in accordance with the permit.
7. [IF APPLICABLE] When the permittee is a corporation or a limited liability corporation (LLC):
Provide one hard copy and one electronic copy of documentation from the NC Secretary of State,
or other official documentation, which supports the titles and positions held by the persons listed in
Section C.2 per 15A NCAC 2H. 1043(3)(b)
https://www.sosnc.gov/online services/search/by title/ Business Registration
JAN 2 6 2022`
a.
BY: --
Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018

D. PERMITTEE'S CERTIFICATION
I, Henry W. Gerock III , the person legally responsible for the permit, certify that I have
a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am
responsible for the performance of the maintenance procedures, and the site has been and will be maintained
according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs
or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the
project, SCMs, or ownership. All information provided on this permit renewal application is, to the best of my
knowledge, correct and complete.
11
Signature: Date. _) a+!= 1 �4
NOTARIZATION:
I, Donna R.
a Notary Public for the State of
North Carolina County of New Hanover do hereby certify
that Hen W. Gerock III personally appeared before me
this the day of January 2022 and acknowledge the due
execution instrument. Witness my hand and official seal,
Dt �yeat) ,
My
June 7, 2025.
JAN 2 6 2022
BY.•
Stormwater Permit Renewal Application Form Page 3 of 3 May 11, 2018

��Y r

PermitNo. SW $ OF)b421 rn-cd
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
UNDERGROUND INFILTRATION TRENCH SUPPLEMENT
This form maybe photocopied for use as an original
DWO Stormwater Management -Plan Review:
A completestormwater management plan submittal includes a stonmwater management permit application, an
underground infiltration trench supplement for each system, design calculations, and plans mid specifications
sbowing-all stonnwatecconveyances and system details.
I. .PROJECT INFORMATION
Project Name: PA:i2-W-1MC G—d•R G-+�
Contact Person: MA .Y,-r."-A4ZeeAM,Fr=, Phone Number: (9)D)'S97-Z929
For projects with multiple infiltration systems, a supplement_ form must be completed for each system. This
worksheet applies-tos- Tieneh= :- - . in' Drainage Area
`(from plans) (from Form SWU-101)
II. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report,Summary (based upon an actupl field investigation and soil borings)
Soil Type S4 nfU
Infiltration Rate,>>�,._. .: - `i • f inlhr r ef/hr/sf (circle appropriate units)
SHWT Elevation (Seasonal High Water Table elevation)
n1&%it> Z9
Trench Design Parameters,
Design Volume 000 c.f. r1ao�*It2-1 o,���i 0$
Design Storm inch event (1.5"inch event for SA waters, 1 inch event./or others)
Drawdown Time Z • p daye- 14a to pe;F
:..4 t;,me.. (,o'f5�.-",�'r�rtz►+T
Perforated,PipeaSize �.ra;. ,;�_ inch 34.
Perforated Pipe•Lengtfi ft.
No. Observation Wells" (may be required on a case -by -case basis)
Stone Type (if used),
Stone Void Ratio, 40,10
Trench Elevations ftnjeetmean sea level
]3ottorri,Elevation;' "t - =2.2 '0 Una 9&—V D
Storage%Overflow Elevation ..V_�-�� /•)

TrenchDimensions
Height
Width, '�T—PIr�TFF �'SI� �S�tATI-I ft.
III.., REQUIRED:ITEM&CHECKLIST'
Length t 7-i - 'PGu"i+4 ft.
Volume Provided lfa 000tcu.ft.
The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N.C.
Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15
A NCAC 2H .1008:= ii a.6
initial in thespace provided to indicate that the following design requirements have been met and supporting
documentation is attached. If the.applicant has designated an agent in the Stormwater Management Permit
Application Form;•the agenE may initial, below. Attach justification if a requirement has not been met.
Applicants. Initials*-
t a. System-isdocate-d 50 feet from class SA waters and 30 feet from other surface waters.
TIC— b.• System is located'at least 100 feet from water supply wells.
c. Bottom of system is at least 2 feet above the seasonal high water table.
DNA: d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
A r ti-= ae.-,:Off.line.system;.tunoff iii excess of the design volume bypasses the system (bypass detail
T — - propided):'
{N f System,is designed to,dr'aw down the design storage volume to the proposed bottom
eIevation.under seasonal high water conditions within five days based upon infiltration
through the bottom only (a hydrogeologic evaluation may be required).
_PAT g. Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
j h. System is not sited on or in fill material or DWQ approval has been obtained.
;- Plaiis'ensare'that the installed system will meet design specifications (constructed or
upon initial operation once the project is complete and the entire drainage area is
stabilized_
j.
System is sized -to take into account the runoff at the ultimate built -out potential from all
surfhccs'draining,to the system, including any off -site drainage.
Nh k.
System is located in a recorded drainage easement for the purposes of operation and
maintenance and has recorded access easements to the nearest public right-of-way.
11.-..System:
captures and infiltrates the runoff from the first 1]/ inch of rainfall,(1.5 inch event'
_ ._far;a`ress�drainirig;toSA
waters)- 2.0
Drainage: area for the device'is less than 5 acres.
i� n.
A. pretreatment device ( filter strip, grassed swale, sediment trap, etc.) is provided.
Pier- o.
Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
1A p. Sides of the infiltration trench are lined with geotextile fabric.
:.. Or ' .,, q.; ,Rock; used is free of fines.(washed stone) and has a large. void ratio.
rSide'to bottom aimratio is less than 4:1.

A MA s. '.Observation well(s) are provided (case -by -case basis).
l�lP. t,• . Vegetated filter is provided for overflow (50 feet for SA waters, 30 feet for other waters)
and detail'is shown on plans.
11� u: A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND IWII:TRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT
1_ After every,runoff producing iaiiifall'event and at least monthly inspect the bypass/overflow structure for
blockage and deterioration and the infiltration system for erosion, trash accumulation, grass cover, and general
condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash and blockages as needed to maintain
3. Remove accumulated :sediment annually of when depth is, reduced to 75% of the original design depth. Restore
depth to original de,sign,depth without over -excavating. Over -excavating may cause the required water table
separation to bereduced and may compromise the ability of the system to perform as designed.
4. The water level in any monitoring wells will be recorded after a I inch rainfall event and at least once a month.
Chronic high water table elevations (within 1 foot of the bottom of the system for a period of three months)
shall be reported to DWQ immediately.
5. If I3_W,Q-dWrftiiues_that tlle;system.is failing, "the system tivill immediately be repaired or replaced to original
design specifioations�,If the system cannot be repaired to perform its design function, other stormwater control
devices as allowed by-NCACG 2H..1000 must be designed, approved and constructed.
6. -Remove accumulated!sediment from the infiltration system annually or when depth in the unit is reduced to
75% of the original design depth. The system shall be restored to the original design depth without over -
excavating. Qver-excavating may cause the required water table separation to be reduced and may
compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an
appropriate manner and shall not -be handled in a manner.that will adversely impact water quality (i.e.
stockpiling,nesr.astbiAiwafer tiratmefit device or stream, etc.).
A benchmark shah be'established in the, infiltration system. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used to
determine the deptli'at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
When the depth at the benchmark reads -4alS , the accumulated sediment shall be removed
_ nd
�PARA _�.;y..._.. a
"I'JA iT W.Iw l2' SPLAMP laV11. —-r,
�C�u�tu,t� • �u•t Maw To G'� G�� �oP.

I acknowledge and agree by my signature below that I am responsible for maintaining the stormwater
collection system in accordance with the six maintenance procedures listed above. I agree to notify DWQ
of any probiems,.with,the. system or prior to any changes to the system or responsible party.
Print Name and Title:'2'C> M%lem &92f, '!r2 J I GAG pai. 51 DEMT
Addiess: in SpuTt+'IT weer, , Wit AW&,rom Mr, Z941S
Phone: QIU-%'7 - 4 BO(p Date: 81 23•0(>
;r:J le"gatly,rOpq`Aob..{¢'p„oL;y}sh'du_ra,not*a',Omeowners association unless more than 50% of the'lots have been sold and a
resident of the'mbdivisidn has been named the president. ,
I, O a Notary Pub c for the State of - County of/
do hereby certify that p tsonally appeared before me this
day of _, and acknowledge the due execution of the forgoing infiltration basin maintenance
'require ts:� imessin handendofficiatseal,
' SE.kL. . ' , � ' My commission expnes
:i.._. _...,.. i... .:vim+.;; i�u "Lir: ''. {et,"n.•:. � _