SW7960103_CURRENT PERMIT_20070404

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SWJJ(O�
DOC TYPE
CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ . COMPLIANCE EVALUATION INSPECTION
DOC DATE
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YYYYMM DD

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Michael F. Easley, Governor
William G. Ross Jr, Secretary
North Carolina Department of Environment and Natural Resources
DIVISION OF WATER QUALITY
April 4, 2007
Coastal Ready Mix Concrete
Attn: Mr. Coy Tillett
PO Box 68
Nags Head, NC 27959
Subject
Dear Mr. Tillett:
Alan W. Klimek P.E. Director
Division of Water Quality
MODIFICATION for
Stormwater Permit No. SW7960103
Moyock Concrete Plant
High Density Stormwater Project
Currituck County
The Washington Regional Office received your request to renew
Stormwater Permit SW7960103 on June 22, 2006. Revised plans and
supporting information was submitted on January 31, 2007. It has
been determined that the project, as proposed, will comply with
the Stormwater Regulations set forth in Title 15A NCAC 2H.1000.
We are forwarding Permit SW7960103 dated April 4, 2007 to Coastal
Ready Mix Concrete for the proposed modifications and continued
operation of a wet detention pond to serve the Moyock Concrete
Plant Site located near Moyock, NC.
This permit replaces all previous State stormwater permits
for this site, and shall be effective from the date of issuance
until April 4, 2017, 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.
North Carolina Division of Water Quality Internet: h2o.enr.state.nc.us
943 Washington Square Mall Phone: [phone]
Washington, NC 27889 FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled110% Post Consumer Paper
NorthCarohna
Naturally

Coastal Ready Mix Concrete
April 4, 2007
Page Two
If you have any questions, or need additional information
concerning this matter, please contact Bill Moore at (252) 948-
3919.
Sincerely,
Al Hodge, Regional Supervisor
Surface Water Protection Section
Washington Regional Office
cc: Currituck County Planning/Inspections
✓Washington Regional Office
Central Files

State Stormwater Management Systems
Permit No. SW7960103
STATE OF NORTH CAROLINA
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
Coastal Ready Mix Concrete
Currituck County
FOR THE
construction, operation and maintenance of stormwater management
systems 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 for
a wet detention pond to serve the Moyock Concrete Plant Site
located near Moyock, NC.
This permit replaces all previous State stormwater permits for
this site, and shall be effective from the date of issuance until
April 4, 2017, 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 9 of this permit,
the Project Data Sheet.
3. Approved plans and specifications for this project are
incorporated by reference and are enforceable parts of the
permit.
3

DIVISION OF WATER QUALITY
PROJECT DATA
Project Name: Moyock Concrete Plant
Permit Number: SW7960103 (Modified)
Location: Currituck County
Applicant: Coastal Ready Mix Concrete
Mailing Address: PO Box 68
Nags Head, NC 27959
Requested Permit: 06/22/2006; renewal request
Modification 01/31/2007; complete
Receiving Stream: Tulls Bay
Stream Classification: C
Total Site Area:
Total Impervious:
Area Allowed
Pond Depth:
Required Storage Volume
Provided Storage Volume
Required Surface Area:
Provided Surface Area
16.11 acres
7.61 acres
4.0 ft
27,951 cf
27,951 cf
21,918 sf
22,000 sf
Controlling Orifice: overflow pipe at elev - 6.45 ft
I

4. No homeowner/lot owner/developer shall be allowed to fill in,
alter, or pipe any vegetative practices (such as swales)
shown on the approved plans as part of the stormwater
management system without submitting a revision to the permit
and receiving approval from the Division.
5. 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.
In addition, the Director may determine that other revisions
to the project should require a modification to the permit.
6. 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
1. 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 its entirety, vegetated and operational for its
intended use prior to the construction of any built -
upon surfaces 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 facilities must be properly maintained and operated at
all times. The approved Operation and Maintenance Plan must
be followed in its entirety and maintenance must occur at the
scheduled intervals.
3. The permittee shall at all times provide the operation and
maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency including, but not
limited to:
5

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 outlet structure,
orifice device and catch basins and piping.
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.
5. 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.
6. Upon completion of construction 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. Mail the
Certification to the Washington Regional Office, 943
Washington Square Mall, Washington, North Carolina, 27889,
attention Division of Water Quality.
7. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for a minimum of five
years from the.date of the completion of construction.
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 143-215.6(a) to 143-215.6(c).
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.
6

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 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.
6. At least six months prior to the expiration date, the
permittee must submit a written request for permit renewal
to the Division of Water Quality, Washington Regional
Office.
Permit issued this the 4 th day of April, 2007.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
r
Alan W. Klimek, P.E. Director
Division of Water Quality
By Authority of the Environmental
Permit Number SW7960103
7
Management Commission

Stormwater Permit
Coastal Ready Mix
Wet Pond System
Currituck County
No. SW7960103 Modification
- Moyock Plant
Designer's Certification
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)
(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.
Signature
Registration Number
Date
0

WTM
Stormwater Permit No. SW7960103 Modification
Coastal Ready Mix - Moyock Plant
Wet Pond System
Currituck County
Designer's Certification
I, _ 000GLPr5 P I 1 �t-u V
, as a duly
registered Professional Engineer in the State of North Carolina,
having been authorized to observe (periodically/weekly/full rime)
the construction of the project,
for CnN(,�Iay Cn. IN(, (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.
Signature
Registration N
Date
8
ESS/ri��ti
- : °� 'SEAL �'.
MAY 1 �) 2008

ProieotName: coastal Ready Mix Moyock
Stormwater Penn? No. SW7' 9 001 03
Designers Certification
curr�ituck Coup
REGEOVED
JUN 2 2 2006
I, Zff T c•_�asaduly ®VVQ tlVlIRO
Registered Professional Engineear in the State of North Carolina} having been authorized to observe
c
of the project,
for e// T -' o Z . oPfi�5A,� ,r.,d'd A �r� ;Project Owner)
hereby state that to the bast of my abilitles, due care and dillgence was used in the obaervaton of
the project eonstnrction such that the construction was observed to be built within substantial
compliance and Intent of the approved plans and specificatio is. Qs root ,-AeOl
Registration Number /W #
Date
;1
SEAL
19224

w'�" wArE RECEO V ED svJACK 6/a�%CYo Michael F. Easley, governor
Oar, :QG Willem G. Rose, Jr., Secretary
JUN 2 2 2006 North Carolina DepeiRment of Environment and Natural Resources
D $ Y Alen W. Kiimek, P.E. Director
✓ DWO-tl ARV DNisbnofWSW Quality
I. CURRENT PEERMIT INFORMATION. 1
1. Stormwater Management Permit Number. SW79f 0103 zo me
d ('ae Pai�J
2. Permit Holder's name: Coastal Ready Mix Moyook
3. Signing official's name: Coy Tillett .Tile: secretary/Owner
person kpriY rnDunsElefor permk) ,
4. Mailing address: Po sox 68 City: Nags Head
State: NC ZipCode: 27959 Phone:[phone]AFAX: 252-441-5898
(Arm Code and Number) pima Code and Manber)
6. Project Name: Coastal Ready Mix Myouok
6. Location cf Project: (svwaddmm) t set Caratoke, Hwy.
7. Directions to Project&=neamstmajor mroneodon) windc.hat3er Way/Caratoke Hwy(r68
II. PERMIT INFORMATION
Specify the type of stormwater treatment (wet pond, Witratm.etc): WX, cfefewfrm, PaJO
?. List any Changes (f m project that was odgbvily approved, attach oddiUmal pages if needed) nrn i n. v-w
StnvarpA�s« nffat/r<i/ c�/ram/afivtcs i /
3. Do you have a copy of the original Operation and Maintenance Agreement? Yes _No_
Applicant's Certification:
X , I, (Pant) eertlfy that the information included on this
permit ran appli Is t the best -of my knowledge, correct and complete. /
7C Signature: ` 1 _Date: 1 10
Submit this m leted form along with an application, fee of $420.00 and a copy of the
designer's certi bon to the address listed below.
Not Cemraa Dadion of WvWOualtty 943 Wa hingWn St1Un Mal PhW802)1146- 81 Cusfaner$Mice 1-8 An-6748
Weahhpmn Ragbnal Oft Weelwpbn, NC 27%9 PAX (232)546�9215 Intamat rdomrst3n.nas .Dee (;3,r^O/�/lrB
0 Equal Opporm ieAfamtadre Mtn Ernolgra— 50% Rary;adfl D% Poat Conwmer Paper �11Y( WA {(lllf

IRECEIV D
JAN 3 1 2001
DWQ-WARD
STORMWATER PERMIT SW 7960103
RENEWAL FOR
MOYOCK CONCRETE PLANT SITE
CURRITUCK COUNTY
PREPARED FOR:
Coastal Ready Mix Concrete Co. Inc.
PO Box 68
Nags Head, NC 27959
PREPARED BY:
Douglas M 7'illett PE
Coastal Ready Mix Concrete Co. Inc.
PO Box 68
Nags Head, NC 27959
[phone]
DATE:
Revised 01-25-07
o 320 'S0,06
b E.
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AW 13 ; SOM

Notes & Project Specifications
Property Owner
Coastal Ready Mix Concrete Co. Inc.
PO Box 68
Nags Head, NC 27959
Subject Property
Coastal Ready Mix Concrete Co. Inc.
Moyock Plant Site
# 13 82 Caratoke Hyw
Currituck, NC 27958
Site Description
Site consists of a concrete ready mixed plant with a material handling storage
facility. Concrete materials are brought to the site by rail and/or truck, stored on
site, and used to prepare concrete mixes as needed. Site includes buildings,
crushed stone driveways, material storage areas and work areas for trucks and
equipment
Stormwater Design Information
Entire Tract = 16.11 acres
Pervious (Farmland) = 8.5 acres
Impervious (I & 11)
= 7.61 acres
I -Buildings and Concrete
= 1.0 acres
11-Gravel Area
= 6.61 acres
Storm Water Management System
Sheet flow runoff flows form plant and gravel area into grassy swales which
convey storm water into wet detention pond. Detention pond includes forebay and
outlet control device. Pond is design to achieve 85 percent TSS removel with
surface area based on Table 3.3-2-coastal counties. Ponds temporary storage is
designed to hold the runoff that results from a I -inch rain and the outlet device is
designed to release this runoff over a 2 to 5 day period. Rains which exceed the I -
inch rain will be released over the emergency overflow. Pond outlet directs
overflow into existing grassy swale which continues for about 400 feet before
empting into drainage ditch. Existing drainage ditch flows toward highway 168.

Site modification
The following modifications will be preformed:
1) Existing pond will be enlarged to satisfy SA/DA ratio as calculated
2) Forebay will be included in new design. Forebay will contain a baffle that
separates the forebay from the remainder of wet detention basin. This baffle
will be above 1 foot below permanent pool elevation.
3) The required storage depth will be provided above permanent pool to store
runoff from 1 in storm.
4) A new outlet device will be installed, as shown on plan, to release runoff from
1 in storm over 2-5 days.
5) A 12-foot-wide aquatic bench with a gentle slope (6H:] V) extending to a
depth of 2 feet will be constructed around perimeter of pond.
6) Emergency overflow will be constructed

Wet Detention Pond Saecitications
1) Pond Depth of 4 feet
2) Permanent pond surface area of 21,918 sq.ft
3) Permanent pond size (11 OftX20011)
4) Forebay equal to 20% of pond volume
5) Temporary pond depth of 1.28 feet
6) 2in diameter orifice outlet
7) Orifice design to discharge 1 in storm over 2-5 days
8) Pond contains emergency overflow swale
9) 1 foot between temp.pool elev. And top of pond freeboard
10) 1211 vegetated aquatic beach around pond

STORNIWATER CALCULATIONS
1. Percent Impervious
2. SA/DA Ratio
3. Required SA
4. Permanent Pool Volume
5. Temporary Pool Volume
6. Temporary Pool Depth
7. Design of Outlet Structure

Stormwater Calculations
1. percent impervious 7.5 acres/16 acres
2. SA/DA ratio (Coastal counties-85%TSS)
Average permanent pool depth
SA/DA ratio(at 4ft, 47% impervious)
3. Surface area SA = (3.09xl6acres)/100
Existing pond is 110 ft wide (use same width)
Use permanent pond size-(110ft x 200ft)
4. Permanent Pool Volume
5. Forebay volume equal 20%
Perm.pool volume =60,576 cu.ft
Forebay volume = 60,576 x .20
6. Temporary pond volume
Use simple method ( lin storm)
Rv--.05+.009I
=.47
= 4ft
= 3.09
= .497 acres
= 21,918 sq.ft
=60,576 cu.ft
=12,115.20 cu.ft
I=(7.5x100)/16 = 47
Rv--.05+.009(47) = .473
Volume=lin x .473 x (Ift/12in) x 16.08acres x 44,100ft2 = 27,951 cu.ft
6. Temporary pond Depth
Depth = 27,951.5cu.ft/21,918 sq.ft =1.28
7. Design of outlet device
2 to 5 days outflow 27,951.50 cu.ft
Q = orifice discharge
Q = CoA(2gHo)^.5
2-days-Q=.1618 ft/sc^2
Given Co=.6 g=32.2ft/sec^2 Ho=1.28 ft
A=.029699 ft^.5
R=1.17in
Diameter for orifice on outlet control = 2in

Coastal Ready Mix Concrete, Inc.
Moyock Facility
STORMWATER MANAGEMENT PLAN
OPERATION AND MAINTENANCE
The proper operation and maintenance of the stormwater management plan for this
facility shall be the responsibility of the owner, Coastal Ready Mix Concrete, Inc.
Operation and maintenance of stormwater management system
I- Detailed inspection by qualified inspector should occur annually. Schedule
maintenance during wet weather to verify facility in operating correctly.
Qualified inspector should inspect the following:
a) Inspect plantings -grasses and aquatic plants
b) Inspect for settling, woody growth, and animal burrowing.
c) Inspect for excessive erosion or sedimentation in or around the basin
d) Inspect riprap around inlets, outlets, and emergency overflow
e) Check that emergency spillway meets design
f) Check that outlet control is operating correctly
g) Check sediment build-up in pond and swales
Il- Operation and maintenance activities should be preformed, by Moyock plant
operator, after every significant runoff and at least monthly.
a) Remove debris and litter at inlet and outlet after storms -producing runoff
b) Check and clear orifice after storms -producing runoff
c) Vegetation management / mowing of grassy swales and area around pond
d) Remove wetland plant when they cover 50% of basin surface. These
plants shall be encouraged to grow along shelf and forebay berm.
e) Check sediment build up every six months, remove if required
f) Check for erosion along swales, pond, inlet and outlet areas
g) Inspect and repair collection system (piping, swales, riprap, etc.)
** Sediment removal is required when basin has lost 25%capacity or swales have lost
25% depth.
I, the undersigned, agree to properly oversee the operation and maintenance of the
stormwater management system as described above. I agree to notify DWQ of any
blems Q' the ystem or prior to any changes to the system or responsible party.
07
NAM AND TITLE DATE

W,1M
Coastal Ready Mix Concrete Co., Inc.
PHONE [phone]
FAX [phone]
®< P.O. Box 68 • 303 W. 8th St. • Nags Head, N.C. 27954
Division of Water Quality
Attn: Mr. William J. Moore
943 Washington Square Mall
Washington, NC 27889
Dear Mr. Moore
January 30, 2 007 REGEDVE®
JAN 3 1 2J'V1
DWQ-WARD
Subject: Stormwater Permit SW7960103
Renewal for
Moyock Concrete Plant Site
Currituck County
Please find enclosed 2 sets of revised plans and specifications for Moyock plant
site. The following modifications have been made to the existing storm water
management system. These modifications are as follows:
1) Support for outlet control device.
2) The stormwater management operation and maintenance plan has been assign
to the Moyock facility
3) Operation and maintenance plan has been signed by responsible party.
Please let me know if these modifications will satisfy requirements for renewal of
stormwater permit #SW7960103.
If additional information is needed or if you have any questions, please feel free
to contact me at [phone]
Sincerely,
Douglas M Tillett PE
Coastal Ready Mix Concrete Co Inc.
"CONCRETE FOR PERMANENCE"

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