SW8961201_HISTORICAL FILE_19980325

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 9
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
Cp HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
MO\ 1� 0,52 5
YYYYMMDD

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
March 25, 1998
Mr. Wayne R. Jones, Treasurer
UNC Institute of Marine Sciences
3431 Arendell Street
Morehead City, NC 28557
1FAA
�
NC®ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Permit No. SW8 961201 Modification
NSF Coastal Processes and Environmental Health Building
High Density Commercial Stormwater Project
Carteret County
Dear Mr. Jones:
The Wilmington Regional Office received the Stormwater Management Permit Application for NSF Coastal Processes and
Environmental Health Building on August 12, 1997, with final information on March 24, 1998. 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. SW8 961201 Modification dated March 25, 1998, for the
construction of NSF Coastal Processes and Environmental Health Building.
This permit shall be effective from the date of issuance until March 25, 2008, 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 thirty (30) 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 Linda Lewis, or me at
[phone].
Sincerely,
RSS/arl
cc:
Rick Shiver, P.G.
Acting Regional Water Quality Supervisor
S : \ W QS\STORM W AT\PERMIT\961201. MAR
Bill Forman, P.E.
Katrina Marshall.
Carteret County Inspections
DCM-Morehead City
Lind Lewis_—
tW.ilmingtoif Regional -Office
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50 % recycled/10% post -consumer paper

State Stormwater Management Systems
Permit No SW8 961201 Modification
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGENT 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
UNC Institute of Marine Sciences
NSF Coastal Processes and Environmental Health Building
Carteret County
FOR THE
construction, operation and maintenance of an infiltration basin 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 March 25, 2008 and shall be subject to the following specified
conditions and limitations:
I. DESIGN STANDARDS
1. 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 on page 3 of this
permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from 43,323 square
feet of impervious area.
3. Due to the SA classification of Bogue Sound, this infiltration basin must be operated with a 50' vegetated filter.
4. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the
permit.
5. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved
plans.

State Stormwater Management Systems
Permit No SW8 961201 Modification
DIVISION OF WATER QUALITY
PROJECT DATA SHEET
Project Name:
NSF Coastal Processes and Environmental Health Building
Permit Number:
SW8 961201 Modification
Location:
Carteret County
Applicant:
Mr. Wayne R. Jones, Treasurer
Mailing Address:
UNC Institute of Marine Sciences
3431 Arendell Street
Morehead City, NC 28557
Application,Date:
August 12, 1997
Water Body Receiving Stormwater Runoff:
Bogue Sound
Classification of Water Body:
"SA"
Infiltration Basin Depth, feet:
1.25
Bottom Elevation, FMSL:
12
Total Impervious Surfaces, ft2:
43,323
Offsite Area entering Pond, ftz:
n/a
Provided Bottom Surface Area, ftz:
3,768 @12
Required Storage Volume, ft3:
5,233
Provided Storage Volume, ft3:
5,320
Temporary Storage Elevation, FMSL:
13.25
Seasonal High Water Table, FMSL
8.67
Type of Soil:
Sand
Expected Infiltration Rate:
15" / hour
Time to Drawdown:
1.1 hours
3

State Stormwater Management Systems
Permit No SW8 961201 MOdifi ation
The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -
upon area.
The following items will require a modification to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision of the project area.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
In addition, the Director may determine that other revisions to the project should require a modification to the
permit.
8. 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.
II. SCHEDULE OF COMPLIANCE
The permittee will comply with the following schedule for construction and maintenance of the stormwater
management system:
a. The stormwater management system shall be constructed in it's entirety, vegetated and operational for it's
intended use prior to the construction of any built -upon surface except roads.
b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be
repaired immediately.
2. 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 side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of bypass structure,catch basins and piping.
g. Access to the bypass structure must be available at all times.
h. The vegetated filter will be kept grassed with no erosion. The spreader mechanism will be kept clear.
3. 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.
4. 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.
0

State Stormwater Management Systems
Permit No SW8 961201 Modification
5. 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.
6. A copy of the recorded deed restrictions must be submitted to the DWQ within 30 days of the date of the recording.
The recorded copy must be signed by the permittee, dated, stamped with the deed book number and page, and bear
the stamp of the Register of Deeds.
7. 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.
8. Prior to the sale of any portion of the property, an access/maintenance easement to the stormwater facilities shall
be granted in favor of the permittee if access to the stormwater facilities will be restricted by the sale of any portion
of the property.
III. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a
name change of the Permittee, a formal permit request must be submitted to the Division of Water Quality
accompanied by an application fee, 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.
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) which
have 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 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.
Permit issued this the 25th day of March, 1998.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
C-k-" A=-� I , ti r tn
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 961201 Modification

State Stormwater Management Systems
Permit No. SW8 961201 Modification
NSF Coastal Processes and Environmental Health Building
Stormwater Permit No. SW8 961201 Modification
Carteret County
Engineer's Certification
1, as a duly registered Professional Engineer in the State of North
Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the 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.
Noted deviations from approved plans and specification:
Signature
Registration Number -
Date
SEAL
0

RECEIVED JAN 2 1 1998
CONTROLLING URBAN RUNOFF:
A Practical Manual for Planning and Designing Urban BMPs
by
Thomas R. Schueler
Department of Environmental Programs
Metropolitan Washington Council of Governments
prepared for
Washington Metropolitan Water Resources Planning Board
Copyright l u 10 WATER
July, 1987. E C E I V E
JAN 211998 D
D E M
PROJ #-

CHAPTER 6: INFILTRATION BASINS
Infiltration basins are effective in removing both soluble and fine
particulate pollutants borne in urban runoff. Coarse -grained pollutants
should generally be removed before they enter a basin. Unlike other
infiltration systems, basins can be easily adapted to provide full control of
peak discharges for large design storms. Also, basins can serve relatively
large drainage areas (up to 50 acres). Depending on the degree of
storage/exfiltration achieved in the basin, significant groundwater
recharge, low flow augmentation and localized streambank erosion control can
be achieved.
Figure 6.1: Schematic of an Infiltration Basin
Top View
Riprap
Outfall
Protection
Side View
Valve
! `.
Flat Basin Floor with
Dense Grass Turf
Back-up Underdrain
Emergency Spillway
(( E:filtration Storage
I
7Riprap Inlet
Settling
Basin and
Level Spreader /
Inlet
Back-up Underdrain Pipe in Case of Standing Water Problems

Chapter 6: Infiltration Basins - 6.3
Full Infiltration Basin
This simple design is commonly used on sites with extremely permeable
soils. The basin is sized to accommodate the entire runoff volume associated
with the two year design storm, and the only outlet from the pond is an
emergency spillway which passes larger storm events (Figure 6.1). A riprap
apron is needed near the inlet to reduce incoming runoff velocities to
promote more uniform infiltration. Otherwise, this rudimentary design has no
other features for routing stormflow or baseflow'through the structure.
Consequently, the the use. of 'a full infiltration basin is generally
restricted to smaller watersheds (5 to 20 acres) that do not have
concentrated, erosive flows.
Combined Infiltration/Detention Basin
This design is one of the more common infiltration basin designs in use
today (Figure 6.2). Runoff entering the top of the basin is first trapped in
a modified riprap settling basin. Coarse sediment drops out, and the
remaining runoff filters through the riprap apron and is spread out over the
level basin floor. The depth of runoff in the basin is controlled by a
vertical riser. The 2 year control orifice is placed several feet above the
bottom of the pond, creating a zone of dead storage. The runoff within the
dead storage zone will be completely exfiltrated. If any baseflow exists, a
low flow channel should be installed to pass it rapidly through the basin.
Figure 6.2: Combined Infiltration/Detention Basin Design
Maintenance
Right-ot-way
-'
Top View l
Side -slopes
\
i
Maximum of 3:1
E mba nkment�,
/ Q~
Flat Basin Floor
with Dense Grass
Runoff Bleeds
Turf
y-Barrel
Riser
Inlet Through Riprap
_
to Basin Floor
-
Riprap
Emergency-
outtall
Spillway
Protection
Side View
Riser
with Mood
— — _ 10 Year Water Surface
—
Elevation
_ _ _
Emergency
—' — 2 Year — —
— — — — —
---
Spillway
-- — '— -- --
-- _— _
Elevation
Embankment
Extiltration Storage
Inflow x
i „t
Anti -seep Collars
Riprap Apron
\ m
Also Serves to
/
Trap Sediments
`

Chapter 6: Infiltration Basins
Figure 6.4
Off-line Infiltration Basin Design
Top View
Sand
Filtration
Chamber
Pretreats
First Hall
Runoff
Inch of
Runoff
Diverted----
from Channel
' o,
C:) ---
Perforated
Underdrains
Lead to
Basin
Side View
Velocity
In r� Dissipation
II II Blocks
Sand
Underdrain
Spreaders
Embankment
Water
EFFECTIVENESS IN STORMWATER CONTROL
Dense Grass Cover
Infiltration basins are unique among all the KIPS reviewed here in tha
conditions. t
they can most closely reproduce natural, pre -development hydrologic
When properly designed and sized, infiltration basins can
completely manage peak discharges from design storms, provide groundwater
recharge and low flow augmentation, reduce storm runoff volumes, and protect
downstream channels from erosion.
Peak Discharge Control
Full infiltration basins are typically sized entire runoff to store and exfiltrate the
volume to
with the design storm. These basins often
have no direct outlet apart from an emeIrgency spillway which passes extreme
storm events. As a result, full infiltration basins will control
post -development peak discharge rates at or below pre -development levels.
The infiltration/detention basin design can completely attenuate the peak
discharges associated with the design storm to pre -development levels. As
with other detention ponds, the optimum level of flood control is achieved
when multiple design storms are controlled (in particular, the 2 and 10 year
storm events). The dead storage provided for enfiltration purposes also
helps to partially or completely attenuate the peak discharges of
intermediate design storms.

'j.
0 K 1 (012)
Ms. Linc
N. C. De
Division
127 Car
Wilmin9
ENGINEERING, P.A.
HESTRON PLAZA TWO
1s1-A HWY. 24
MOREHEAD CITY, NORTH CAROLINA 28557
(e19) 247-747e
Feb 26 '98 9:39
RECEIVED JAN 2 1 1998
January 16, 1998
of Environment, Health and Natural Resources
later Quality
I Drive
North Carolina 28405
Re: stgrmwater Project No, SW8 961201:
NS� Environmental Health Building
Cafteret County
Dear Ms.
Poet -It" Fax Note 7671
Date/L,
* of &
ro J .Z4
Ir, "' L.i.'Ier2Lzwi5
co/oopL
c".
Phone a
Phone k
IF II
Y"n e
This letter is in response to you letter of Nojember 10, 1997 requesting additional
information for completion,of the review of the referenced project. Sheet LA-1 has
been revised and is enclosed for your review an approval.
The fbiloi Ang, information is provided in res' onse to the items in your November 10,
1997 request for additional information: P
1. Pipe izes are Ievised on the JB-2 detail to be consistent with the,.plan.
2. The storage. in the pond has been rechecked with the overflow at JB-2 set at
eleva�on 13.25 feet and the pond bottom at elevation 12.0 feet. The 1.25 feet of
storage provides 5,246 cubic feet of storage for the first 1.5 inches of rainfall from
49,36b square feet of drainage area with a runoff coefficient of 0,85. Some
Yfreeboard is desirable to protect the integrity of the top of the containment dike.
3. A flo spreader, detalf 31LA-2, is provid d that incorporates rip -rap and a flared and
sectidn at the outlet of the.18 inch pipe,the infiltration pond. I know of no physical
justifitration or regulatory requirement f r incorporation of a flow spreader as
described in your. November, IOth letter You are referred to Figures 6.1, 6.2 and
6.4 ofj "Controlling Urban Runoff, A Preetical Manual for Planning and Designing
Urbar BI ° Rip -rap flow;spreaders ire shown in the Infiltration pond examples,
show In each of the referenced figure 1. Additionally, Chapter 4 of the "Stormwater
Manaigement Guidance Manual" publis. ed by the N. C. Department of EnAmnment,
Health and Natural Resources, contains no requirement or recommendation for flow
spreaders as required by your letter. Tle rip -rap flow spreader provided will serve
to trap sediments and distribute flow to lthe pond_ The pond bottom will be graded
a..# ..1. ♦&.o f1mA, in 4hn nnnrl will he Rver Iv distributed by gravity.

MAR-24-1998 12:21 FROM DEM WATER QUALITY SECTION TO
WIRO P.01/02
rj
State of North Carolina
Department of Environment, Health and Natural Resources
Division of Water Quality
512 North Salisbury Street • Raleigh, North Carolina 27604
James B. Hunt, Jr., Governor
Facsimile Cover Sheet
To: --------
Fax: -IN-LE-0-------------- ---
From: �.QP
Phone: [phone] cot '53�
Fax: [phone]
OD pages, including this cover sheet_
Comments:
Wayne McDevitt, Secretary
Regional Offices
Asheville Fayetteville Mooresville Raleigh Washington Wilmington Winston-Salem
7041251-6208 919NO-1541 7041663-1699 9191571-4700 919/946.6481 919/395-3900 919/896.7W7
Pollution Prepantion Pays
P.O. Box 29535. Raleigh. North Carolina 27626-0535 Telephone [phone] Fax: [phone]
An Equal Opportunity Affirmative Action Employer

- MAR-24-1998 12:21 FROM DEM WATER QUALITY SECTION TO TIRO P.02/02
PW:1
AOondaY. Made 23, 19"
This is in response to your request for justification with respect to the NSF Environmental Health Building
project that Stroud Enginmring submitted.
Their response to your add -info letter, which requited a flow spreader in the utflitration basin, is teclu lcak
tem will not functi
we do not have
require a flow spreader s this requirefiless there is certainly that emen does not appear in the rules or the BMP Manual design
my to
raquirerr�nts.
'Cho technical reference'Controlling Urban Runoff only appears in the rules with respect to sizing stormwater
management systems and runoff calculation methods and is incorporated by reference� ttthaattppuurpos ress a pecif e
A flow spreader can be recommended based upon BPl and accepted engineering p
problem However, the design engineer may choose to propose another option to address the problem.
TOTAL f- . 02

RECEIVED JAN 2 1 1998
STROUD ENGINEERING, P.A.
HESTRON PLAZA TWO January16, 1998
151-A HWY. 24
MOREHEAD CITY, NORTH CAROLINA 28557
[phone]
Ms. Linda Lewis
N. C. Department of Environment, Health and Natural Resources
Division of Water Quality
127 Cardinal Drive
Wilmington, North Carolina 28405
Re: Stormwater Project No. SW8 961201
NSF Environmental Health Building
Carteret County
Dear Ms. Lewis:
This letter is in response to you letter of November 10, 1997 requesting additional
information for completion of the review of the referenced project. Sheet LA-1 has
been revised and is enclosed for your review an approval.
The following information is provided in response to the items in your November 10,
1997 request for additional information:
1. Pipe sizes are revised on the JB-2 detail to be consistent with the plan.
2. The storage in the pond has been rechecked with the overflow at JB-2 set at
elevation 13.25 feet and the pond bottom at elevation 12.0 feet. The 1.25 feet of
storage provides 5,245 cubic feet of storage for the first 1.5 inches of rainfall from
49,360 square feet of drainage area with a runoff coefficient of 0.85. Some
�freeboard is desirable to protect the integrity of the top of the containment dike.
A flow spreader, detail 3/LA-2, is provided that incorporates rip -rap and a flared end
section at the outlet of the 18 inch pipe to the infiltration pond. I know of no physica
justification or regulatory requirement for incorporation of a flow spreader as
described in your November 10th letter. You are referred to Figures 6.1, 6.2 and
6.4 of "Controlling Urban Runoff, A Practical Manual for Planning and Designing
Urban BMP's." Rip -rap flow spreaders are shown in the infiltration pond examples
shown in each of the referenced figures. Additionally, Chapter 4 of the "Stormwater
Management Guidance Manual" published by the N. C. Department of Environment
Health and Natural Resources, contains no requirement or recommendation for flow
spreaders as required by your letter. The rip -rap flow spreader provided will serve
to trap sediments and distribute flow to the pond. The pond bottom will be graded
flat so that flow to the pond will be evenly distributed by gravity.
107 COMMERCE ST.
3961 A MARKET ST.
HESTRON PLAZA TWO
SUITE
SUITEA
151-A HWY. 24
GREENVILLE, NC 27858
WILMINGTON, INC 28403
MOREHEAD CITY, NC 28557
[phone]
[phone]
[phone]

RECEIVED JAN 2 1 199d
Ms. Linda Lewis
January 12, 1998
Page 2
Completion of your review of the referenced application is requested at the earliest
possible date.
Please call me if you have questions concerning this submittal.
Sincerely,
STROUD ENGINEERING, P.A.
J. W. Forman, Jr., P
Project Engineer
Enclosures
CC: OBrien Atkins Architects

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
November 10, 1997
Mr. Ron Cullipher, P.E.
Stroud Engineering
151-A Highway 24
Morehead City, NC 28557
g,qqCDEN'K
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 961201
NSF Environmental Health Building
Carteret County
Dear Mr. Cullipher:
The Wilmington Regional Office received previously requested information for the Stormwater
Management Permit Application for NSF Environmental Health Building on November 10, 1997. A
preliminary review of that information has determined that the application is not complete. The following
information is needed to continue the stormwater review:
1. The JB-1 detail still shows a 15" pipe to the vegetated filter while the culvert data tables
clearly show pipe #8 to be 18".
2. You have not provided 2' of storage in the pond. The overflow in JB-1 is set at 13.25,
therefore, if the pond bottom is 12, only 1.25' of storage is provided. Please either recalculate
the volume or raise the invert of the 18" pipe to the vegetated filter up to 14.
3. A flow spreader mechanism to get the runoff evenly spread over the entire infiltration area
has not been provided, as previously requested. Something on the order of what was provided
at the Community College Banks Street project will be fine.
127 North Cardinal Dr., Wilmington, North Carolina 28405 - Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10°/ post -consumer paper

Mr. Cullipher
November 10, 1997
Stormwater Project No. SW8 961201
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to December 10, 1997, or the application will
be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
RSS/arl:
cc:
Sincerely,
Ms. Linda Lewis
Environmental Engineer
S: \W QS\STORM W AT\ADDINFO\961201. NOV
Linda Lewis
Central Files
127 North Cardinal Dr., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50 % recycled/10 % post -consumer paper

STROUD ENGINEERING, P.A.
Hestron Plaza One
Suite 102
MOREHEAD CITY, NORTH CAROLINA 28557
[phone]
DET6(~t✓11fJ�. NIAXI%IC�f� . ST<
1N,: 12�LEr,IC-1hJE'Lj f'Cb
JOB Pt`z5cC-SSFS HUtIS
SHEET NO. I OF /I
CALCULATED �L DATE `�
CHECKED BV 00 DATE �n 9
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SEAL
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.... ..
........

STROUD ENGINEERING, P.A.
HESTRON PLAZA TWO
151-A HWY. 24
MOREHEAD CITY, NORTH CAROLINA 28557
[phone]
Ms. Linda Lewis
NCDEHNR
Division of Water Quality
Water Quality Section
127 Cardinal Drive Extension
Wilmington, North Carolina 28405-3845
RE: NSF Coastal Processes Building
SW8 961201 Modification
Dear Ms. Lewis:
OCT 0 6 1997
BY:
October 3,1997
Please find enclosed two copies of revised grading plan of the construction set for the
above referenced project. This letter is in response to your request for additional information
dated September 9, 1997. A more detailed breakdown is as follows:
1. Calculations for the revised pond are included with this letter.
2. Application has been corrected.
3. Even though the pond was previously permitted, we have added and FES with
flow spreader and rip -rap as requested to distribute the incoming flow.
4. References to pond 2 have been removed.
5. Drainage area has been delineated.
6. J13-2 is the correct manhole for the detail.
7. Detail has been corrected.
8. Detail has been corrected.
9. Storage height is shown correctly on included calculation sheet.
If you have any additional questions or comments concerning this project please feel
free to contact me.
Sincerely,
Joseph R. Leveille, E.I.T.
107 COMMERCE ST. 3961 A MARKET ST. HESTRON PLAZA TWO
SUITE B SUITE A 151-A HWY. 24
GREENVILLE, NC 27858 WILMINGTON, NC 28403 MOREHEAD CITY, NC 28557
[phone] [phone] [phone]

State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr. Division of Water Quality Wayne McDevitt
Governor Water Quality Section Secretary
September 9, 1997
Mr. Joey Leveille
Stroud Engineering
151-A Highway 24
Morehead City, NC 28557
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 961201 Modification
NSF Environmental Health Building
Carteret County
Dear Mr. Leveille:
The Wilmington Regional Office received a Stormwater Management Permit Application for NSF
Environmental Health Building on August 12, 1997. A preliminary review of that information has
determined that the application is not complete. The following information is needed to continue the
stormwater review:
1. Calculations for the revised pond were not included with the submittal.
2. The project area and the built -upon area have been placed in the wrong blanks on the
application. Please switch them around.
3. Add a flow spreader mechanism in the pond to evenly distribute the runoff over the entire
surface area of the pond.
4. Delete the reference to Pond 2 on the plans,ie., the "hatched areas".
5. Delineate and label the entire drainage area boundary.
6. JB-lA is not labelled on the plans. (Possibly labelled as JB-2?)
127 Cardinal Drive Extension. Wilmington, N.C. 2W5-3845 • Telephone [phone] • Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Leveille
September 9, 1997
Stormwater Project No. SW8 961201 Modification
7. The JB-lA detail is incorrect. The pipe size to the basin is 18", not 15". The overflow goes
to the vegetated filter, not JB-4, and is 18", not 15". The inverts of the pipes are not labelled.
8. If the invert of the overflow pipe is set at 13.25, and the top of the weir is 13.06, doesn't that
mean that the water level will reach 13.25 before it exits to the filter? If you intend to provide
storage to only 13.06, then you need to drop the invert of the overflow piping at or below
13.06. If you intend to provide storage to 13.25, then the weir wall can be no higher than
13.25.
9. Use of 13.06 as the storage elevation results in a deficient volume. Please indicate in the
calculations that 13.25 is the storage elevation.
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to October 9, 1997, or the application will be
returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\961201.SEP
cc: Linda Lewis
Central Files
01

AUG 12 1997
STROUD ENGINEERING, P.A. IBY: =
HESTRON PLAZA TWO August 11, 1997
151-A HWY. 24
MOREHEAD CITY, NORTH CAROLINA 28557
[phone]
Ms. Linda Lewis
NCDEHNR
Division of Water Quality
Water Quality Section
127 Cardinal Drive Extention
Wilmington, North Carolina 29405-3845
RE: NSF/Coastal Processes and Environmental Health Building
SWQ8961201
Dear Ms. Lewis,
Please find enclosed two copies of the revised stormwater management plan for the
above referenced project. This project is being submitted as a modification to the existing
permit that was approved on April 23, 1997. Redesign of the system was done due to budget
restrictions in the hopes of eliminating the concrete storage tanks and pump controls. This
was achieved by piping the stormwater previously routed to the tanks under the building to a
single infiltration basin. The second basin was eliminated and the remaining one was
enlarged to accomidate all of the calculated runoff.
If you have any questions or comments concerning this project, please feel free to
contact me.
Sincerely,,
Joseph R. Leveille, EIT
107 COMMERCE ST. 3961 A MARKET ST. HESTRON PLAZA TWO
SUITE B SUITE A 151-A HWY. 24
GREENVILLE, NC 27858 WILMINGTON, NC 28403 MOREHEAD CITY, NC 28557
[phone] [phone] [phone]