SW7050117_CURRENT PERMIT_20050726

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW 705t9//'7
DOC TYPE
� CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
DOC DATE
YYYYMMDD

r WArF90 Michael F. Easley, Governor
p G William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
4 Alan W. Klimek, P.E. Director
Division of Water Quality
July 26, 2005
Mr. Christopher A. Sewell, Manager
900 Ehringhaus Street, LLC
PO Box 15159
Chesapeake, VA 23328-5159
Subject: Stormwater Permit No. SW7 050117
Ehringhaus Office Park
High Density Project
Pasquotank County
Dear Mr. Sewell:
On behalf of the Washington Regional Office, the Wilmington Regional Office received and
reviewed a complete Stormwater Management Permit Application for Ehringhaus Office Park
on July 25, 2005. Staff review of the plans and specifications has determined that the project,
as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC
2H.1000. We are forwarding Permit No. SW7 050117 dated July 26, 2005, for the construction
of the subject project.
This permit shall be effective from the date of issuance until July 26, 2015, and shall be subject
to the conditions and limitations as specified therein. Please pay special attention to the
Operation and Maintenance requirements in this permit. Failure to establish an adequate
system for operation and maintenance of the stormwater management system will result in
future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have
the right to request an adjudicatory hearing upon written request within sixty (60) days
following receipt of this permit. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands
are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please
contact Al Hodge at [phone].
Sincerely,
-Z,024 �'Xz`
Edward Beck
Regional Supervisor
Surface Water Protection Section
ENBlarl: S:1WQSlSTORMWATIPERMIT1SW7050117,ju105
cc: Sean Robey, P.E., Hyman & Robey, PC
Pasquotank County Building Inspections
Al Hodge, Regional Supervisor-SWPS, WaRO
=ashington _Regional=Office Filet
Central Files
North Carolina Division of Water Quality 127 Cardinale Drive Extension Phone [phone] Customer 5ervicel-877-623-6748 One
Wilmington Regional Office Wilmington, NC 28405-3845 FAX [phone] Internet: h2o.enr.state.nc.us NortilCarollna
An Equal OpportuMylAffirmative Action Employer— 50%Recycled110% Post Consumer Paper ;Vatuta!!ry

State Stormwater Management Systems
Permit No. SW7 050117
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE 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
Christopher A. Sewell & 900 Ehringhaus Street, LLC
Ehringhaus Office Park
900 W. Ehringhaus Street, Elizabeth City, Pasquotank County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the
approved stormwater management plans and specifications and other supporting data as
attached and on file with and approved by the Division of Water Quality and considered a part
of this permit.
This permit shall be effective from the date of issuance until July 26, 2015, and shall be
subject to the following specified conditions and limitations:
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 3 of this permit. The stormwater control has been
designed to handle the runoff from 105,946 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, .and per approved plans.
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.
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.
Page 2 of 7

State Stormwater Management Systems
Permit No. SW7 050117
0
The following design criteria have been provided in the wet detention pond and must be
maintained at design condition:
a. Drainage Area, acres:
Onsite, ft :
Offsite, ft2:
b. Total Impervious Surfaces, ft2:
C. Design Storm, inches:
d. Pond Depth, feet:
e. TSS removal efficiency:
f. Permanent Pool Elevation, FMSL:
g. Permanent Pool Surface Area, ft2:
h. Permitted Storage Volume, ft3:
i. Temporary Storage Elevation, FMSL
j. Controlling Orifice:
k. Permitted Forebay Volume, ft3:
1. Receiving Stream/River Basin:
M. Stream Index Number:
n. Classification of Water Body:
11. SCHEDULE OF COMPLIANCE
3.80
165,528
0
105,946
1
4.0
90%
3.00
12,888
11,598
3.85
1.5"0 pipe
6,807
UT Pasquotank River/ Pasquotank
PAS50 30-3-(7)
"SC"
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 optimum efficiency. 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. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow spreader,
catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
Page 3 of 7

State Stormwater Management Systems
Permit No. SW7 050117
5. Decorative spray fountains will be allowed in the stormwater treatment system, subject
to the following criteria:
a. The fountain must draw its water from less than 2` below the permanent pool
surface.
b. Separated units, where the nozzle, pump and intake are connected by tubing,
may be used only if they draw water from the surface in the deepest park of the
pond.
c. The falling water from the fountain must be centered in the pond, away from the
shoreline.
d. The maximum horsepower for a fountain in this pond is 1/8 horsepower.
6. The facilities shall be constructed as shown on the approved plans. This permit shall
become voidable unless the facilities are constructed in accordance with the conditions
of this permit, the approved plans and specifications, and other supporting data.
7. 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.
8. 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.
9. Access to the stormwater facilities shall be maintained via appropriate easements at all
times.
10. The permittee shall submit to the Director and shall have received approval for revised
plans, specifications, and calculations prior to construction, for any modification to the
approved plans, including, but not limited to, those listed below:
a. Any revision to any item shown on the approved plans, including the stormwater
management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project area.
The project area is defined as all property owned by the permittee, for which
Sedimentation and Erosion Control Plan approval or a CAMA Major permit was
sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
11. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction.
12. A copy of the approved plans and specifications shall be maintained on file by the
Permittee for a minimum of ten years from the date of the completion of construction.
13. 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.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW7 050117
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director. In the
event of a change of ownership, or a name change, the permittee must submit a formal
permit transfer request to the Division of Water Quality, accompanied by a completed
name/ownership change form, documentation from the parties involved, and other
supporting materials as may be appropriate. The approval of this request will be
considered on its merits and may or may not be approved. The permittee is responsible
for compliance with all permit conditions until such time as the Division approves the
transfer request.
2. Failure to abide by the conditions and limitations contained in this permit may subject
the Permittee to enforcement action by the Division of Water Quality, in accordance
with North Carolina General Statute 143-215.6A to 143-215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with any
and all statutes, rules, regulations, or ordinances, which may be imposed by other
government agencies (local, state, and federal) having jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including
those as may be required by this Division, such as the construction of additional or
replacement stormwater management systems.
5. The permittee grants DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing
of a request for a permit modification, revocation and reissuance or termination does
not stay any permit condition.
7. Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
8. Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address
changes within 30 days.
Permit issued this the 25th day of ,duly 2005.
Pil
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Nan vv. mimeK, r.t., uirector
Division of Water Quality
By Authority of the Environmental Management Commission
Page 5 of 7

State Stormwater Management Systems
Permit No. SW7 050117
Ehringhaus Office Park
Stormwater Permit No. SW7 050117
Pas uotank Count
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

State Stormwater Management Systems
Permit No. SW7 050117
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 outlet/bypass structure elevations are per the approved plan.
6. The outlet structure is located per the approved plans.
7. Trash rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
g. 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. Required drawdown devices are correctly sized per the approved plans.
13. All required design depths are provided.
14. All required parts of the system are provided, such as a vegetated shelf, and a
forebay.
15. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Regional Office
Pasquotank County Building Inspections
Page 7 of 7

OFFICE USE ONLY
Date Received
Fee Paid
Permit Number
I - 31-2W5 f9 , 7-
S 4 2011
D 5ou -7-
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
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
900 Ehringhaus Street. LLC
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Christopher Sewell, Manager
3. Mailing Address for person listed in item 2 above:
PO Box 15159
City: Chesapeake State:
Telephone Number: 757 5 4 6— 0 7 2 0
VA
Zip: 23328-5159
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Ehrincihaus Office Park
5. Location of Project (street address):
900 h in haus Street
City: Elizabeth City County: Pasquotank
6. Directions to project (from nearest major intersection):
Approximately 1.2 miles from the US 17 Bypass/Business intersection of
Ehringhaus Street, and Hughes Blvd._ On the north sideat corner of Shirley
Street.
7, Latitude: 3 60 17 ' Longitude: 7 6o 13 ' of project
8. Contact person who can answer questions about the project:
Name: Sean C. R o b e y, PE Telephone Number: ( 2 5 2 ) 3 3 5 —18 8 8
II. PERMIT INFORMATION:
1. Specify whether project is (check one): X New Renewal Modification
Form SWU-101 Version 3.99 Page 1 of 4

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 X High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
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.
Stormwater runoff will be collected in drainage structures and piped
to a wet retention pond for Lreatment to meet the 90% TSS removal
requirement.
2. Stormwater runoff from this project drains to the .,,Pasauot ank _ River basin.
3. Total Project Area: 3.8 acres
5. How many drainage areas does the project have? 1
4. Project Built Upon Area:
63.95 %
6. 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,
zB91n�Information�,i'
F ,Jr
e.. ..- w a,.. ,i, _,-+,... ,. ,i r• .,
s �;
h th :,!:�i, ., , -..., x r, i set, g k �. • N• :i'�+
' +5
Ni 1P.Dri3ina a Area 2
3 * v autt uvnag
Receiving Stream Name
pas uotank
Receiving Stream Class
SC
Drainage Area
3.8
Existing Impervious* Area
1.6 (all to be
demolished )
Proposed Impervious*Area
2 .43�
% Impervious* Area (total)
6 3 . 9 5go
Impervious*Surface Area � _ '^
�1 f
' ; , 'Drainage Area' l
7Y -F N S
t, Drainiage Area 2 .
On -site Buildings
33,750 SF
On -site Streets
On -site Parking
65,333 SF
On -site Sidewalks
6,863 SF
Other on -site
Off -site
Total: 10 6 S F
Total:
* Lrnper0ous area Is defined as the built upon area Including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

7. How was the off -site impervious area listed above derived?
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized 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.
1. The following covenants are Intended to ensure ongoing compliance with state stormwatermanagement permit number
as issued by the Division of Water Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood
decking or the water surface of swimming pools.
3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area In excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity
and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the Iand, 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.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench. Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99 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 Regional Office.
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 l / 7, S
• One copy of the applicable Supplement Form(s) for each BMP 5
• Permit application processing fee of $420 (payable to NCDENR) S
• Detailed narrative description of stormwater treatment/management _ 5
• Two copies of plans and specifications, including: S
- 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)
VIL 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.
Designated agent (individual or flan): Hyman _ & Robey, , PC
Mailing Address: 150-A US hwy 158 East
City:_
Camden
Phone: ( 252 ) 335--1888
VIII. APPLICANT'S CERTIFICATION
State: NC
Fax: ( 252
Zip: 27921
338-5552
I, (print or type name ofperson listed to General Information, item 2) C%f&! 5 i er'N I;JZ A .S ( w4F- c
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 21-1.1000.
Date: / 1 I ` OS_
Form SWU-101 Version 3.99 Page 4 of 4

Permit No. 5W 7 d 5() ( 0-
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
I. PROJECT INFORMATION
Project Name: Ehringhaus•:office Park
Contact Person: Chris Sewell Phone Number: ( 757) 546-0720
For projects with multiple basins, specify which basin this worksheet applies to:
elevations
Basin Bottom Elevation
-1 •0
ft.
(floor of the basin)
Permanent Pool Elevation
3.0
ft.
(elevation of the orifice)
Temporary Pool Elevation
3.85
ft.
(elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area
12,888
sq. ft.
(water surface area at the orifice elevation)
Drainage Area
3.8
ac.
(on -site and off -site drainage to the basin)
Impervious Area
2.43
ac.
(on -site and of -site drainage to the basin)
volumes
Permanent Pool Volume
32,543
cu. ft.
(combined volume of main basin and foreboy)
Temporary Pool Volume
11,598
cu. ft.
(volume detained above the permanent pool)
Forebay Volume
6, 807
cu. ft.
(approximately 20% of total volume)
Other parameters
SA/DA1
5.6 5%
(surface area to drainage area ratio from DWQ table)
Diameter of Orifice
1 • 5
in.
(2 to 5 day temporary pool draw -down required)
Design Rainfall
-5sr-9 ,
in.
Design TSS Removal 2
90
%
(minimum 85% required)
Form SWU-102 Rev 3.99 Page 1 of 4

Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate 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 agent may initial below. If a requirement has not been met, attach justification.
Is
a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations)
f. The basin length to width ratio is greater than 3:1.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
j. A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
1. If the basin is used for sediment and erosion control during construction, clean out of the
J,, basin is specified prior to use as a wet detention basin.
Kd"h m. A mechanism is specified which will drain the basin for maintenance or an emergency.
111. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
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) 0 does Q does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does 0 does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of

2/'.

Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
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 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 2 . 2 5 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool EIevation 3 . 0
Sediment Re oval El. 0 _ 7 5 ---� 75 o
Sediment Removal Elevation n - n n 75%
Bottom Ele anon 0. 00 %------------------------------- �-------------------
Bottom Elevation ._ 1 • 0 25%
FOREBAY
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form SWU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: Christopher A.Sewell
Title:- Manager, 900 Phria-ghaus Street,
Address: PO Box 15159, Chesapeake, VA 23328-5159
Phone: [phone]
Signature:
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.
I, �- a Notary Public for the State of 'tl
County of C)cAf2c,utz!YV c,,,,_ - , do hereby certify that Lr
personally appeared before me this Z day of �t).� c��, and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
WWlMNE L CGM
NOTARY PUBUB
RMOTMI CWM NC
SEAL
My commission expires
Form SWU-102 Rev 3.99 Page 4 of 4

W - --C.
ROY COOPER NORTH CAROLINA
Governor Environmental Quality
MICHAEL S. REGAN
Secretary
WILL.IAM E. (TOBY) VINSON, JR
Interim Director
November 6, 2018
900 Ehringhaus, LLC
CIO Mr. Larry Torrech
831 Industrial Avenue
Chesapeake, VA 23324
Subject: Stormwater Permit Renewal
Stormwater Management Permit SW7050117
Ehringhaus Office Park
Pasquotank County
Dear Mr. Torrech:
A Division of Energy, Mineral, and Land Resources file review has determined that
Stormwater Permit SV 7050117 for a stormwater treatment system consisting of a wet
detention pond serving Ehringhaus Office Park located at 900 Ehringhaus Street in
Elizabeth City, NC expires on July 26, 2019. This is a reminder that permit renewal
applications are due 180 days prior to expiration. We do not have a record of receiving
a renewal application.
Please submit a completed permit renewal application along with a $505.00 fee for
permit renewal. Permit application forms for renewal can be found on our website at:
httns://deo.nc.izov/about/divisions/enervv-mineral-land-resources/enerizv-mineral-land-
ruies/stormwater-program/post-construction. North Carolina General Statutes and the
Coastal Stormwater rules require that this property be covered under a stormwater
permit. Failure to maintain a permit subjects the owner to assessment of civil penalties
If..you have questions, please feel free to contact me at [phone]. 1 will be glad to
discuss this by phone or meet with you. If you would like I can e-mail you a copy of the
renewal application. You can request a copy by e-mailing me at
[e-mail].
Sincerely,
Roger K. Thorpe
Environmental Engineer
�1HCMIOLINAR E Q`_`��
ay.ren.m a [„rr.vneprr o.rnr r
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Washington Regional Office 1 943 Washington Square Mall I Washington. North Carolina 27889
757 946.6481