SW8080529_HISTORICAL FILE_20080731

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 0�8o620)
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
© HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
20o �3 of 3
YYYYMMDD

TFR
Michael F. Easley, Governor
William G. Ross Jr., Secretan
North Carolina Department of Environment and Natural Resources
Coleen 11. Sullins Director
Division of Water Quality
July 31, 2008
Ken Murphy, President of Board of Directors
The Tiller School of Carteret County
1950 Hwy. 70 East
Beaufort, NC 28516
Subject: State Stormwater Permit No. SW8 080529
The Tiller School of Carteret County
High Density Project
Carteret County
Dear Mr. Murphy:
The Wilmington Regional Office received a complete Stormwater Management Permit
Application for The Tiller School of Carteret County on July 30, 2008. 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 080529 dated July 31, 2008 for the construction of the subject project.
This permit shall be effective from the date of issuance until July 31, 2018, 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 Steve Pusey, or me at [phone].
Sincerely,
%, Edward Beck
Regional Supervisor
Surface Water Protection Section
ENB/sgp: S:\WQS\STORMWATER\PERMIT\080529.ju108
cc: Tim Summerville, ANC Engineering, Inc.
Carteret County Building Inspections
Steve Pusey
GWilmin'gton_Regional7Office�7
Central Files
No ehCarolina
Naturally
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Plrone [phone]
Wilmington Regional Office Internetwww.ncwaterqualityorg Fax [phone]
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1-877-623-6748

State Stormwater Management Systems
Permit No. SW8 080529
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY COMMERCIAL 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
Ken Murphy & Board of Directors for The Tiller School of Carteret County
The Tiller School
1950 Hwy. 70 East, Beaufort, Carteret County
FOR THE
construction, operation and maintenance of a permeable pavement parking lot
infiltration basin and 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 July 31, 2018, 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 1.7 on page 3 of this permit. The stormwater
controls for DA-1 and DA-2 have been designed to handle the runoff from 27,443
and 25,701 square feet of impervious area, respectively.
3. The permeable pavement basin and the infiltration basin must each be operated
with a 50' vegetated filter.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of
this permit, and per approved plans.
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.
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. SW8 080529
Ll�
7
The following design criteria have been permitted for the permeable pavement
and infiltration basin, and must be provided and maintained at design condition:
91
b.
C.
d.
e.
f.
h.
I
Drainage Area, 9cres:
Onsite, ft :
Offsite, ftz:
Total Impervious Surfaces, ftz:
Design Storm, inches:
Basin Depth, feet:
Bottom Elevation, FMSI�:
Bottom Surface Area, ft :
Bypass Weir Elevation, FMSy
Permitted Storage Volume, ft
Type of Soil:
Expected Infiltration Rate, in/hr:
Seasonal High Water Table, FMSL
Time to Draw Down, hours:
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
II. SCHEDULE OF COMPLIANCE
DA-1
DA-2
Permeable
Infiltration
Pavement
Basin
0.75
1.2
32,670
52,272
0
0
27,443
25,701
1.5'
1.5"
0.8
0.5
7.59
7.3
14,060
5,295
N/A
7.8
3,291
3,230
Brown fine sand w/ silt
0.99
0.99
5.33
5.33
9.7
6
Gibbs Creek / White Oak
21-35-1-10
"SA; HQW"
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 bypass structure, infiltration media, flow
spreader, catch basins, piping and vegetated filter.
g. A clear access path to the bypass 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.
5. 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.
6. 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.
Page 3 of 7

State Stormwater Management Systems
Permit No. SW8 080529
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. Access to the stormwater facilities shall be maintained via appropriate recorded
easements at all times.
9. 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.
10. Prior to the construction of any permitted future areas shown on the approved
plans, the permittee shall submit final site layout and grading plans to the
Division for approval.
11. A copy of the approved plans and specifications shall be maintained on file by
the Permittee at all times. At the time the permit is transferred to a new owner,
the permittee shall forward the approved plans to the new owner.
12. 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.
III. GENERAL CONDITIONS
This permit is not transferable to any person or entity 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 completed Name/Ownership Change form
to the Division of Water Quality, signed by both parties, and accompanied by the
supporting documentation as listed on page 2 of the form. The approval of this
request will be considered on its merits and may or may not be approved.
2. The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request.
3. 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.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW8 080529
4. 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.
5. 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.
6. 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.
7. The permit remains in force and effect until modified, revoked, terminated, or
renewed. The permit may be modified, revoked and reissued or terminated for
cause. The filing of a request for a permit modification, revocation and
reissuance, renewal or termination does not stay any permit condition.
8. 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.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. The permittee shall notify the Division in writing of any name, ownership or
mailing address changes at least 30 days prior to making such changes.
11. The permittee shall submit a permit renewal application at least 180 days prior to
the expiration date of this permit. The renewal request must include the
appropriate documentation and the processing fee.
Permit issued this the 31st day of July, 2008.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 5 of 7

P„t
_.,,f•�;DWQ�US&ONLYf �r' .�«;, , , �,.-; �, : f,, ,t ,,
Date Received
Fee Paid
Permit Number
SoS.00 V960/.6G30
&': �
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This farm 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):
The Tiller School of Carteret County
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Ken Murphy, President of Board of Directors tiller School
3. Mailing Address for person listed in item 2 above:
City:Beaufort State:NC Zip:28516
Phone: (252 ) 728-1995 Fax: (258- ) 728-3711
Email:[e-mail]
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
5. Location of Project (street address):
City:Beaufort County:Carteret Zip:28516
6. Directions to project (from nearest major intersection):
Hwy70 North of Pinners Point Road
7. Latitude:34° 44' 07" N Longitude:76° 38' 04" W of project
8. Contact person who can answer questions about the project:
Name:Robert Brown Telephone Number: (252 ) 247-2127
Email:[e-mail]
H. PERMIT INFORMATION:
1. Specify whether project is (check one): ®New Renewal Modification
Form SWU-101 Version 02.19.08 Page 1 of 4

12. , 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 ❑Igigh Density ®Redevelop ❑General Permit ®Universal SMP [:]Other
4. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑CAMA Major ®Sedimentation/Erosion Control ❑404/401 Permit ❑NPDES Stormwater
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project .
The front parking area will be paved with pervious pavement to allow infiltration of the area. Any overflow from
the parking lot will overtop the curb and travel through the existing swales on along the property lines and then
pass through a 50' vegetative shelf before exiting the site. The roof tops and school yard areas will drain to a
shallow bowl/infiltration area in the middle of the rear Yard. An emergancy spillway has been provided in the
basin to pLiss-lirger storms through a 50' vegetative shelf before exiting the site.
2. Stormwater runoff from this project drains to the While Oak River basin.
3. Total Property Area: 3.37 acres 4. Total Wetlands Area: N/A acres
5. 100' Wide Strip of Wetland Area: N/A acres (not applicable if no wetlands exist on site)
6. Total Project Area**:3.37 acres 7. Project Built Upon Area:36.2 %
8. I -low many drainage areas does the project have?2
9. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
For high density projects, com lete the table with one drainage area for each engineered stormwater device.
Basin Information
Drainage Area 1,.,
Drainage Area 2 .
Receiving Stream Name
Gibbs Creek
Gibbs Creek
Stream Class & Index No.
2I -35-IV SA ' IiQN1
21-35-/-/O SA HQvi
Total Drainage Area (sf)
32,670
52,272
On -site Drainage Area (4)
32,670
52,272
Off -site Drainage Area (sf)
0 sf
0
Existing Impervious* Area (sf)
0 sf
11,326 sf
Proposed Impervious*Area (sf)
27,443
14,374 sf
'% Impervious* Area (total)
84.0%
49.2%
Impervious' Surface Area .
Drainage Area 1 `t '
: ' ' Drainage Area.2
On -site Buildings (sf)
0
24,830
On -site Streets (sf)
0
0
On -site Parking (sf)
25128
0
On -site Sidewalks (sf)
2,315
871
Other on -site (sf)
0 sf
0
Off -site (sf)
0 sf
0
Perm SWU-101 Version 02.19.09 Page 2 of 4

Total (sf): 27,443 25,701
Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation. This is the area used to calculate percent project built upon area (BLIA).
10. I -low was the off -site impervious area listed above derived?
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following deed restrictions and protective covenants are required to be recorded for all subdivisions,
outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot
number, size and the allowable built -upon area for each lot must be provided as an attachment. Forms can be
downloaded from http://li2o.enr.state.nc.us/su/bmp forms.hhn -deed restrictions.
Form DRPC-1
High Density Commercial Subdivisions
Form DRPC-2
High Density Developments with Outparcels
Form DR13C-3
High Density Residential Subdivisions
Form DRPC-4
Low Density Commercial Subdivisions
Form DRPC-5
Low Density Residential Subdivisions
Form DRPC-6
Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, that the covenants will be binding
Oil all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the
sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms. Forms can be downloaded from htto://112o.enr.state.nc.us/su/bmp forms.htm.
Form SW401-Low Density
Form SW401-Curb Outlet System
Form SW401-Off-Site System
Form SW401-Wet Detention Basin
Form SW401-Infiltration Basin
Form SW401-Infiltration Trench
Form SW401-Biorelention Cell
Form SW401-Level Spreader
Form SW401-Welland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Form SW401-Permeable Pavement
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Permeable Pavement Supplement
Form SWU-101 Version 02.19.08 Page 3 of 4

VI., SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the
interactive online map at htto://h2o.enr.state,nc.us/su/msi maps.hau)
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
• 94,ig l an one c y of the Deed Restrictions & Protective Covenants Form (if /lf
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP
• Permit application processing fee of $505 $4,099-fen Express) payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/ management
• Copy of any applicable soils report
• Two copies of plans and specifications (sealed, signed & dated), including:
- Development/Project name
- Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section. (ex. designing engineer or firm)
Designated agent (individual or firm): V44-10 � Alt / cludi bi l'J oEtz�4 M
Mailing Address: C&NTKEWL. ST cr ,
City: CAP'f e1 !) State: is_ % Zip: 7 S/ 3
Phone: (1� 1 �3 O j 624, Fax: IT
Email: brad aiic t°vt9iheC//}•q.C.oen
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) K��IAlL' /�lAn
certify that the information included on this permit application form is, to the best my mf y kn wledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1000.-
UC-, &r P(?61 Pyj- &D Date: i2 44 4 Aut Zbot
Form SWU-101 Version 02.19.08 Page 4 of

RE: Tiller School
Subject: RE: Tiller School
From: "Tim Summerville" <[e-mail]>
Date: Wed, 30 Jul 2008 16:23:24 -0400
To: "Steve Pusey" <[e-mail]>
Steve,
I was told that there are 3 members on the Board of Directors: Ken Murphy, President. Alicia Durham,
Secretary, and a Treasurer. All 3 of the members can sign legal documents for the school.
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, INC 27513
919.439.7454
tim()ancengineering.com
www.ancengineering.com
From: Steve Pusey[mailto:[e-mail]]
Sent: Wednesday, July 30, 2008 4:12 PM
To: Tim Summerville
Subject: Re: Tiller School
Tim,
I received the "Infiltration Basin Operation & Maintenance Agreement" signed by the Board of
Director's Secretary, Alicia Durham. Does she have power of attorney for Ken Murphy? If so, this
will be acceptable.
Regards,
Steve
Tim Summerville wrote:
Steve,
I have attached the revised calculations and narrative. I spoke with the project manager this morning, and he is
meeting with Ken Murphy today and will have the formed signed and dropped off to you this afternoon.
I am a little confused about the deed restrictions. It looks like those are for individual lots that are to be sold off.
This property is to remain as one. I believe you sent an email on Friday saying to ignore the deed restrictions, it
was a mistake. Can you please clarify.
Thanks
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
ti m (o)ancengineering.com
www.ancengineering.com
1 of 6 7/30/2008 5:57 PM

fyL1t�t.L �
V F.rgiucering. lnc.
C'n!I EnAanirn h WnJ.Su.,xTvus
Tiller School
Storm Water Drainage Narrative
1U 17 CentrenwCourt
core, NC 37517-2015
Phonr: 919-677-1996
Fua: 919-677-199H
July 28, 2008
The referenced site is located off of US 70 (Live Oak Street) in the Town of Beaufort,
North Carolina. The site is currently occupied by a 6 buildings totaling 16,988 sq. ft.
The proposed construction activities include the demolition of 3,920 sq. ft of building and
the addition of 12,200 sq. ft of buildings as well as new curbing and walks. The existing
impervious area on the site is 0.77 acres or 22.8% of the 3.37 acres of the total site.
The proposed construction activities will increase the adjusted BUA to 1.22 acres or
36.2% of the total site.
By analyzing the existing topography and a visit to the site, it was determined that the
vast majority of the storm water runoff from the site is collected in the two ditches that
run along the east and west boundary of the site. There is also a small swale that nuns
through the middle of the lower half of the site. These ditches and Swale discharge into
heavily wooded, vacant land. In order to control the excess runoff generated by the
additional BUA, 2 separate infiltration systems are proposed to be constructed. The first
system will be to pave all of the new parking areas with pervious pavement. This will
allow storm water to be collected on the site and drain through the existing pavement to
the sandy soil below. This area is labeled as drainage area 1. Below are the calculations
used to calculate the required runoff and storage volumes:
PERVIOUS V M T INFILTRAT ON SYSTEM DRAINAGE
RUNOFF COEFFICIENT CALCULATION
LAND USE AREA (A) RUNOFF COEFFICIENT ( C )
re[)
BUILDING 0.00 095
PAVEMENT 0.53 095
GRAVEL 0.00 0.65
GRASS 0.12 0,30
WATER ow 130
TOTALAREA 075
Rv=0' 5a 009(H Re 0.01
WHERE I= PERCENT IMPERVIOUS
DESIGN VOLUME THAT MUST BE CONTROLLED
FROM THE I.5"STORM:
VOLUME=(DESIGN RAINFALL) •R✓(DRAINAGE AREA) - 3,291 c1

PERVIOUS PAVEMENT VOLUMES
TOTAL
ELEVATION
BASIN
CUMULATIV
(ft)
AREA
AVG. AREA
HEIGHT VOLUME
VOIORATIO VOLUME
0.GO
14.060
14,060
0.6 7,030
0.35 2,461
0.50
14,060
14,060
04 5,905
0.20 3.842
0.92
14,060
2e= 00
3,291 of nmoded at Z15 08
DRAWDOWN TIME
ORAWOOWN RATE 0,99 iWhr
MAX. STORAGE DEPTH 9.61n
IN BASIN
TOTAL DRAWDOWN 9.7 hr
TIME 0.40 days
The second system is to be an infiltration basin located at the rear of the site that is to
collect the additional runoff generated from the new buildings and the runoff produced by
the existing and relocated buildings. Below are the calculation used to calculate the
required runoff and storage volumes:
INFILTRATION BASIN SYSTEM DRAINAGE AREA 2
RUNOFF COEFFICIENT CALCULATION
LAND USE
AREA (A)
RUNOFF COEFFICIENT (C )
ac ez)
r0.57
BUILDING
0.95
PAVEMENT
0.02
0.95
GRAVEL
0.00
085
GRASS
0.61
0.30
WATER
0.00
IDO
TOTAL AREA
1.20
RUNOFF COEFFICIENT CALCULATION
Rv=005� ONM R, 049
WHERE I = PERCENT IMPERVIOUS
DESIGN VOLUME THAT MUST BE CONTROLLED
FROM THE 1.5' STORM:
VOLUME = (DESIGN "NFALL) - R, - (DRAINAGE AREA) 3,218 c1
INFILTRATION BASIN
BASIN
CUMULATIVE
ELEVATION AREA AVG.AREA
HEIGHT
VOLUME
VOLUME
7.3 5,295
6,460
0.5
3,230
3,230
7.8 7,625
STORAGE ELEVATIONS
Zo =
7.3
Vt,+.e.= 3,218 cf proNded at
Z,s=
7.8
DRAWDOWN TIME
DRAWDOWN RATE 0,991Whr
MAX. STORAGE DEPTH 6 in
IN BASIN
TOTAL DRAWDOWN 6.1 hr
TIME 0,25 days

Per DWQ regulations, all storm water above the 1.5" stomi must pass through a 50'
vegetative filter strip before exiting the site. As mentioned above, most of the existing
runoff from the site passes through swales on the east and west properly lines. These
swales are to be utilized for the post development overflow from the parking lot. Larger
storms will overtop the curb and travel through the swales and then pass through a 50'
vegetative filter strip, and then exit the site.
A spillway on the infiltration basin has been provided to allow larger storms to pass and
not flood the site or existing ditches. A 50' vegetative filter has been provided adjacent
to the spillway to allow the overflow storm water to be treated before exiting the site.

Re: 'Filter School
Subject: Re: Tiller School
From: Steve Pusey <Steven.Pusey@ncmail. net>
Date: Mon, 28 Jul 2008 14:28:09 -0400
To: Tim Summerville <[e-mail]>
'rim,
1 received your revised Application Form. Thanks.
I still need the following items before I can issue the permit:
. Revise calculations with new drainage area and impervious areas.
3. Infiltration Basin Operation & Maintenance Agreement, signed by Ken Murphy and notarized.
Please advise if you have any questions.
Thanks,
Steve
Tim Summerville wrote:
Steve,
I have been confused since the beginning on the BUA. I was having a hard time figuring how the existing,
proposed and demoed impervious areas work into the application worksheet. I think I have it down now
and modified the application to reflect the 36.2% BUA. The numbers I used in the application worksheet
were taken directly from the drainage calculations, so those sheet should be good. I will put a copy of the
revised application in the mail today. Please confirm if you need any thing else.
Thanks and have a nice weekend.
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
tim onancenoineerino.com
www.ancengineering.com
From: Steve Posey[mailto:Steven. [e-mail]]
Sent: Friday, July 25, 2008 10:18 AM
To: Tim Summerville
Subject: Re: Tiller School
Thanks, Tim. I am looking at it now.
I of 5 7/28/2008 2:28 PM

Re: Tiller School
The numbers have changed significantly. Drainage areas are now smaller for both I & 2. Total
BUA has increased from 1.11 ac. to 1.22 ac. There was an increase in parking and a decrease in
buildings (now 0) for Drainage Area 1. There was an increase in buildings in Drainage Area 2
and a decrease in sidewalks. From our discussions, this does make some sense.
Overall project BUA is 36.2% according to my calculation. Please verify and correct item 7 on
page 2 of application.
The changes in drainage area and impervious area will effect your calculations. Therefore, please
revise and resubmit that part of your application package. Also, please submit a hard copy of the
new Application page 2 so I can incorporate it into the previous signed Application.
Thanks,
Steve
Tim Summerville wrote:
Steve,
Attached is the revised application.
Let me know if you have any comments/questions.
Thanks
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
timQancengineerinq.com
www.ancengineering.com
From: Steve Pusey[ma ilto:Steven. [e-mail]
Sent: Thursday, July 24, 2008 6:01 PM
To: Tim Summerville
Subject: Re: Tiller School
Thanks,
Steve
Tim Summerville wrote:
Steve,
I sent Kenneth the form and told him to sign it and mail it directly to you.
I'll send you an updated application.
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
2 of 5 7/28/2008 2:28 PM

Re: Tiller School
tim(o)ancengineering.com
www.ancengineering.com
From: Steve Pusey [ma Ito: Steven. Pusey@ncmait. net]
Sent: Thursday, July 24, 2008 9:31 AM
To: Tim Summerville
Subject: Re: Tiller School
Tim,
Only one more thing needed. Please complete the infiltration basin Operation & Maintence
Agreement and have it signed by Kenneth Murphy of Tiller School and notarized. Let me know
if you have any questions.
Also, please make any necessary corrections to the Application Form page 2.
Thanks,
Steve
Tim Summerville wrote:
Steve,
Please find the revision attached as we discussed this afternoon. I also included a calculation of the
10-year storm velocity across the emergency spillway. The velocity came to about 1 ft/sec. I added a note
the plans that the spillway needs to be 20 ft long. Please contact me with any questions.
Thanks, again.
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Cf.
Cary, NC 27513
919.439.7454
tim(a)ancengineering.com
www.ancengineering.com
From: Steve Pusey[maiIto: Steven. [e-mail]
Sent: Thursday, July 17, 2008 3:57 PM
To: Tim Summerville
Subject: Re: Tiller School
Tim,
Ijust reviewed your resubmittal for Tiller School. Everything is complete except I would like to
see a detail ofthe overflow spillway. Remember, we had talked about several types of "bypass
structures" designed to bypass excess flow above 1.5" storm. Are you using the overflow structure
as a bypass for excess flow? Does the Swale normally channel the flow into the basin, but once
the level is above the storage elevation of 7.8', water flows over the spillway?
You are showing the overflow at 7.5'. Wouldn't this cause the flow to bypass the basin entirely?
3 of 5 7/29/2008 2:28 PM

Re: Tiller School
You may need to modify some of the contours on your drawing to show the path of the water.
Please explain.
Steve
Tim Summerville wrote:
Steve,
Just an FYI, I put the revised plans in the mail yesterday so you should be receiving them today or
tomorrow.
Please let me know if you need anymore information and let us know what the next step is. The school is
in a time crunch to have this school open by the beginning of this school year.
Thanks again.
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
tim(a)ancengineering.com
www.ancengineering.com
Steve Pusey
Environmental Engineer
NCDENR - Division of Water Quality
Wilmington Regional Office
910-796-7334
Steve Pusey
Environmental Engineer
NCDENR - Division of Water Quality
Wilmington Regional Office
910-796-7334
Steve Pusey
Environmental Engineer
NCDENR - Division of Water Quality
Wilmington Regional Office
910-796-7334
4 of 5 7/28/2008 2:28 PM

Re: 'Filler School
Steve Posey
Environmental Engineer
NCDENR - Division of Water Quality
Wilmington Regional Office
910-796-7334
Steve Posey
Environmental Engineer
NCDENR - Division of Water Quality
Wilmington Regional Office
910-796-7334
5 of 5 7/28/2008 2:28 I'M

®1 Y Engineering, Inc.
Cidl E,,giG LnnASumeroec
117 Centrcwest Court
Care, NC 27513-2015
Phone: [phone]
Fax: [phone]
Letter of Transmittal
ANC # 07-521
Date July 22, 2008
TO: Steve Posey
Water Quality Section Storm Water
127 Cardinal Drive Extension
Wilmington, NC 28405
RE: Tiller School
Revised Drawings
We are sending the following:
[ ] Bluelines [ ] Samples
[ x ] Originals [ ] Submittal
[ I Specifications [ ] Addenda
[ ] Shop Drawings [ ] Copy of Letter
] Other:
VIA: [] Mail [x] Overnight
JUL 2 3 2008
Purpose:
[ ] For Approval [ ] Returned for Approval
[ ] For Review [ ] For Your Use
[ ] Approved as Noted [ x ] As Requested
[ ] Other:
[] 2"aDay [] Other: HANDDELIVERY
Quantity
Drawing/Spec
Latest Date
Description
2
Revised
Construction
Drawings
7-11
Revised plans per your email approval on Friday
July 11
BY: TinrSunvnerville
ANC ENGINEERING, INC.
Cc: File

FHWA Urban Drainage Design Program, HY-22
HYDRAULIC PARAMETERS OF OPEN CHANNELS
Trapezoidal, Rectangular, or Triangular X-Section
Date: 07/21/2008
Project No. :07-521
Project Name.:Tiller School
Computed by :TRS
Project Description
Vegitative Swale from Pond Overflow
INPUT PARAMETERS
1.
Channel Slope (ft/ft)
0.0010
2.
Channel Bottom width (ft)
20.00
3.
Left Side Slope (Horizontal to 1)
0.00
4.
Right Side Slope (Horizontal to 1)
0.00
5.
Manning's Coefficient
0.030
6.
Discharge (cfs)
9.70
7.
Depth of Flow (ft)
0.50
OUTPUT RESULTS
Cross Section Area (Sgft) 10.00
Average Velocity (ft/sec) 0.97
Top Width (ft) 20.00
Hydraulic Radius (ft) 0.48
Froude Number 0.24

I
L Entrineerini.,. Inc.
Letter of Transmittal
ANC # 07-521
Date July 15, 2008
TO: Steve Pusey
Water Quality Section Storm Water
127 Cardinal Drive Extension
Wilmington, NC 28405
RE: Tiller School
Revised Drawings
We are sending the following:
( ] Bluelines [ ] Samples
[ x ] Originals [ ] Submittal
[ ] Specifications [ ] Addenda
[ ] Shop Drawings [ ] Copy of Letter
[ ] Other:
VIA: [I Mail [x] Overnight
117 Centrewest Court
Cary, NC.27513-2015
Phone:-919-677-1996
Fax::[phone]
'EIV ED
JUL 1 7 2008
Purpose:
[ ] For Approval [ ] Returned for Approval
(] For Review [ ] For Your Use
[ ] Approved as Noted [ x ] As Requested
[ ] Other:
[] 2nd Day ( ] Other: HAND DELIVERY
Quantity
Drawing/Spec
Latest Date
Description
2
Revised
Construction
Drawin s
7-11
Revised plans per your email approval on Friday
July 11
BY: Tim Summerville
ANC ENGINEERING, INC.
Cc: File

®®' 117 Centrewest Cana
Cary, NC 27513-2015
®1 Y Engineering„ /nc. Phone: [phone]
CScH h"i" ni k Lond'S ....... Fax: [phone]
July 15, 2008
Tiller School
Storm Water Drainage Narrative
The referenced site is located off of US 70 (Live Oak Street) in the Town of Beaufort,
North Carolina. The site is currently occupied by a 6 buildings totaling 16,988 sq. ft.
The proposed construction activities include the demolition of 3,920 sq. ft of building and
the addition of 12,200 sq. ft of buildings as well as new curbing and walks. The existing
impervious area on the site is 0.77 acres or 22.8% of the 3.37 acres of the total site.
There is an existing building on site with associated parking and driveways that was built
prior to 1988. The Built Upon Area (BUA) for pre-1988 construction is 0.17 Ac. Below
are the existing area impervious area calculations as well as the adjusted area calculation
for the pre-1988 construction:
EXISTING CONDITIONS
RUNOFF COEFFICIENT AND BUA CALCULATION
LAND USE AREA (A) RUNOFF COEFFICIENT (C)
oecne)
BUILDING 0.39 095
(Area pre 1988 - 0.09 Ae)
PAVEMENT 0.23 0.95
GRAVEL
0.15 0.85
(Area pre 1988 - 0 08 Act
GRASS
260 0.30
TOTAL AREA
3.37
ADJUSTED AREA CALCULATION
Total Site Area
337 Ac
BUA Pre 1988 =
0.17 Ae
Adjusted Site Area
3.20 Ac
CALCULATE THE PERCENT IMPERVIOUSIBUAI'
TOTAL DRAINAGE ARENIMPERVIOUS PORTION OF THE DRAINAGE AREA
PERCENT IMPERVIOUS (BOA)• 228 %
The proposed construction activities will increase the adjusted BUA to 1.11 acres or
34.7% of the total site. Below is a calculation for the post development adjusted BUA:
PROPOSED CONDITIONS
RUNOFF COEFFICIENT AND BUACALCULATION
USING ADJUSTED AREA CALCULATIONS
LAND USE AREA (A) RUNOFF COEFFICIENT(C)
(acres)
BUILDING 048 095
PAVEMENTISIDEWALKS
PERVIOUS PAVEMENT
GRASS
TOTAL AREA
a 30 0.95
0.33 095
209 030
320
CALCULATE THE PERCENT IMPERVIOUS,
TOTAL DRAINAGE ARENIMPERVIOUS PORTION OF THE DRAINAGE AREA
PERCENT IMPERVIOUS ISLA). 343 %

P/
By analyzing the existing topography and a visit to the site, it was determined that the
vast majority of the storm water runoff from the site is collected in the two ditches that
run along the east and west boundary of the site. There is also a small swale that runs
through the middle of the lower half of the site. These ditches and swale discharge into
heavily wooded, vacant land. In order to control the excess runoff generated by the
additional BUA, 2 separate infiltration systems are proposed to be constructed. The first
system will be to pave all of the new parking areas with pervious pavement. This will
allow storm water to be collected on the site and drain through the existing pavement to
the sandy soil below. This area is labeled as drainage area 1. Below are the calculations
used to calculate the required runoff and storage volumes:
PERVIOUS PAVEMENT INFILTRATION SYSTEM DRAINAGE AREA 1
RUNOFF COEFFICIENT CALCULATION
CALCULATE THE PERCENT IMPERVIOUS:
TOTAL DRAINAGE AREA/IMPERVIOUS PORTION OF THE DRAINAGE AREA
LAND USE AREA (A)
RUNOFF COEFFICIENT(C)
(wind)
PERCENT IMPERVIOUS • 04.0 %
BUILDING 0.00
0.95
PAVEMENT 0.63
0.95
GRAVEL 000
005
GRASS 0,12
030
WATER 000
100
TOTALAREA 075
RUNOFF COEFFICIENT CALCULATION
Rv= 0.05-0.009(I)
Re 001
WHERE I= PERCENT IMPERVIOUS
DESIGN VOLUME THAT MUST BE CONTROLLED
FROM THE 1.5" STORM:
VOLUME -(DESIGN RAINFALL)' Rv- DRAINAGE AREA) 3,291 o1
PERVIOUS PAVEMENT VOLUMES
TOTAL
ELEVATION
BASIN
CUMU
AREA
AVG. AREA
HEIGHT VOLUME
VOID RATIO
LUMF
VOME
0
000
14060
14.060
0.5 ),OJO
095
2p61
0.50
14,060
16060
OA 5905
0.20
3,6R
092
1<Ofi0
4- 0.0
0 provided at 2,e- 0.0
DRAWDOWN TIME
DRAWDOWN RATE
099 iNN
MAX. STORAGE DEPTH
9a id
IN BASIN
TOTAL DRAWDOWN
97 hr
TIME
0 e0 days
The second system is to be an infiltration basin located at the rear of the site that is to
collect the additional runoff generated from the new buildings and the runoff produced by
the existing and relocated buildings. Below are the calculation used to calculate the
required runoff and storage volumes:

INFILTRATION BASIN SYSTEM DRAINAGE AREA 2
RUNOFF COEFFICIENT CALCULATION
LAND USE
AREA (A)
RUNOFF COEFFICIENT(C)
(acres)
BUILDING
057
0.95
PAVEMENT
002
095
GRAVEL
0.00
0.85
GRASS
061
0.30
WATER
0.00
100
TOTALAREA
120
RUNOFF COEFFICIENT CALCULATION
RvOOSM.009(0 R.r 049
WHERE I= PERCENT IMPERVIOUS
DESIGN VOLUME THAT MUST BE CONTROLLED
FROM THE IS' STORM:
VOLUME = (DESIGN RAINFALL)' R, - (DRAINAGE AREA)
CALCULATE THE PERCENT IMPERVIOUS:
TOTAL DRAINAGE AREAI MPERVIOUS PORTION OF THE DRAINAGE AREA
PERCENT IMPERVIOUS• 492 %
3,210 cf
INFILTRATION
BASIN
BASIN
CUMULATIVE
ELEVATION
AREA AVG. AREA
HEIGHT
VOLUME
VOLUME
7.3
5.295
6.460
0.5
3,230
3,230
8
7.625
STORAGE ELEVATIONS
Ze =
].3
V,,is-=
3,21E of provided at
Z'r
7.8
DRAWDOWN TI
DRAWDOWN RATE
099 iNr
MAX. STORAGE DEPTH
6 in
IN BASIN
TOTAL DRAWDOWN
6.1 hr
TIME
0.25 days
Per DWQ regulations, all storm water above the 1.5" storm must pass through a 50'
vegetative filter strip before exiting the site. As mentioned above, most of the existing
runoff from the site passes through swales on the east and west property lines. These
swales are to be utilized for the post development overflow from the parking lot. Larger
storms will overtop the curb and travel through the swales and then pass through a 50'
vegetative filter strip, and then exit the site.
A spillway on the infiltration basin has been provided to allow larger storms to pass and
not flood the site or existing ditches. A 50' vegetative filter has been provided adjacent
to the spillway to allow the overflow storm water to be treated before exiting the site.

RE: Tilley School
a
Subject: RE: Tiller School
From: "Tim Summerville" <[e-mail]>
Date: Fri, 11 Jul 2008 09:28:17 -0400
To: "Steve Posey" <[e-mail]>
CC: 'Brad Rhinehalt" <[e-mail]>
Steve,
I have revised the Tiller School Plans per your review letter and our telephone
and e-mail conversations. I have attached the revised sheets here. I have also
included the revised supplements. Please review the revised plans at your
earliest convenience and let me know if there are still any outstanding issues. I
will re -send you a formal submittal once we agree that the plans are satisfactory.
In addition to the revised plans, please see my response to your comments bellow
in blue.
Thanks and I look forward to hearing form you soon.
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
[e-mail]
www.ancengineering.com
-----Original message -----
From: Steve Pusey[mailto:[e-mail]]
Sent: Wednesday, June 25, 2008 4:16 PM
To: Tim Summerville
Subject: Tiller School
Tim,
Please reference our request for additional information below. A formal
letter will be sent via mail.
Regards,
Steve Pusey
DWQ-Wilmington Office
---------------------
June 25. 2008
Ken Murphy, President of Board of Directors
The Tiller School of Carteret County
1950 Hwy. 70 East
Beaufort, NC 28516
Subject: Request for Additional Information
Stormwater Project No. SW8 080529
The Tiller School
Carteret County
Dear Mr. Murphy:
The Wilmington Regional Office received a State Stormwater Management
Permit Application for The Tiller School on May 27, 2008. A preliminary
review of that information has determined that the application is not
complete. The following information is needed to continue the stormwater
review:
OPlease either delineate all wetlands on site, disturbed or
undisturbed, or note on the plans that none exist.
I of 7/11/2008 10:42 AM

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FW: Tiller Dishes
Subject: FW: Tiller Ditches
From: "Tim Summerville" <[e-mail]>
Date: Wed, 9 Jul 2008 08:32:12 -0400
To: "Steve Pusey" <Steven.Pusey@ncmail. net>
Steve,
Please see below note and attached photos from the property owner representative. I explained our discussion
Monday of discharging the ditches back onto our property and pass through the 50' vegetative filter. I looked at
the grading and it would be possible, however, it would require us gaining an offsite grading easement which
could delay the project.
Please review the attached information about the swales ultimate discharge, and if necessary, we will start the
process of gaining the offsite grading easements.
Again, thank you for your help on this project and I look forward to hearing from you shortly.
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
tim(o)ancengineering.com
www.ancengineering.com
From: Robert Brown [mailto:[e-mail]]
Sent: Tuesday, July 08, 2008 10:10 AM
To: Tim Summerville
Subject: Tiller Ditches
Tim,
I went out to Tiller this moming and walked the ditches. The two side ditches make it to the end of the
site. They do outflow into a single ditch that is on the contiguous property line. It however runs
approximately 360' before it stops. The ditch appear to have overgrown and silted full. I have attached
some photos and will call to explain their location.
Thanks,
Robert M. Brown, AIA
Architect/ Director
EDA pa
architects -engineers -planners
4206 Bridges Street Ext., Suite C
Morchead City, NC 28557
252-247-2127 (Office)
252-247-0674(Fax)
rbrowntc4EDApa.com.
www.EDApa.com
I of 7 7/9/2008 9:40 AM

v
1 �

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Re: 'Cil ler Scbool
-Subject: Re: Tiller School
From: Steve Pusey <[e-mail]>
Date: Thu, 26 Jun 2008 10:32:08 -0400
To: Tim Summerville <[e-mail]>
CC: Brad Rhinehalt <[e-mail]>
Gentlemen,
Thank you for your comments.
I have the following comments back to you on some of these issues, numbered according to the
original items. If there is no comment on an item, it is accepted.
8. The emergency overflow weir is not acceptable. The overflow or stormwater in excess of 1.5"
storm must be directed to a vegetated filter area by other means. This can be accomplished by
directing the sheet flow into a swale which will lead to an overflow device that will allow the 1.5"
storm to enter the infiltration basin and direct the overflow to a vegetated filter at least 50' in length.
For example, the overflow device can be either a cast -in -place downspout / splash guard or a flash
board in the swale. Please call if you need guidance on this item.
10. Simply eliminating the curb is not acceptable. The solution may involve changing or eliminating
the curb but further changes are necessary. The parking lot should be regraded to direct the overflow
or excess flow to a vegetated filter at least 50' in length. The overflow must sheet flow through this
filter before entering the drainage ditches. This can be accomplished by gently grading the pervious
concrete area to an open area where the vegetated filter can be installed. You do have some open
areas on your site that can be utilized.
13. With the exception of the relocated building, roof drainage for pre-1988 buildings does not have to
be directed to the infiltration basins. It can run off to the existing drainage ditches.
1 hope this helps to clear things up. I apologize for any confusion we may have caused.
I look forward to your earliest response.
Regards,
Steve Pusey
Tim Summerville wrote:
Steve,
Please findbelowmy responses to your comments in blue as we discussed over
the phone. Let me how to proceed as soon as possible so that we can get
revised plans back to you.
Thanks
ANC Engineering, Inc.
I of 5 6/26/2008 10:33 AM

Re: Tiller School
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
[e-mail]
www.ancengineering.com
-----Original Message -----
From: StevePosey[mailto:[e-mail]]
Sent: Wednesday, June 25, 2008 4:16 PM
To: Tim Summerville
Subject: Tiller School
Tim,
Please reference our request for additional information below. A formal
letter will be sent via mail.
Regards,
Steve Pusey
DWQ-Wilmington Office
----------------------------------------------
June 25, 2008
Ken Murphy, President of Board of Directors
The Tiller School of Carteret County
1950 Hwy. 70 East
Beaufort, NC 28516
Subject: Request for Additional Information
Stormwater Project No. SWS 080529
The Tiller School
Carteret County
Dear Mr. Murphy:
The Wilmington Regional Office received a State Stormwater Management
Permit Application for The Tiller School on May 27, 2008. 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. Please either delineate all wetlands on site, disturbed or
undisturbed; or note on the plans that none exist.
There are no wetlands on site and the revised plan will state this.
2. Please locate each BMP and all swales in common areas and/or access /
drainage easements, to be recorded.
All BMP's will be placed in an easement.
3. The drainage area for each basin or trench should be clearly
delineated and numbered to match up to the calculations and supplement.
The relocated building is considered new impervious area and should be
located in a drainage area to be treated by an infiltration basin.
The drainage areas will be labeled accordingly. The roof top runoff from the
relocated building will be directed to the infiltration basin.
4. It appears that you have used an infiltration trench supplement for
an infiltration basin. A separate supplement must be provided for a
basin or trench, as applicable. Please be sure to use the correct form,
depending on whether you have a basin or trench.
2 of 5 6/26/2008 10:33 AM

Re: Tiller School
An infiltration basin supplement will be provided in place of the infiltration
trench supplement.
5. Basin section detail should show 3:1 side slope for sides stabilized
with vegetation.
Per our discussion, we are proposing 10:1 side slopes in the basin and this
will be labeled on the revised plan.
6. Permeable pavement systems should only be used for low traffic
volume, less than 100 vehicles per day. Reference section 18.3.3 of BMP
manual for this and additional design requirements.
Permeable pavement is only proposed in the parking areas. The main drive
aisles are to be asphalt.
7. If desired, you can complete the permeable pavement supplement to
determine credit for the proposed pervious concrete area. This credit
will lower the percent impervious, thus lowering the required storage
volume for the necessary infiltration trench or basin. If a trench is
installed underneath the parking lot, then pervious credit will not be
allowed and the design should be treated as if it were an impervious
parking lot.
Per our discussion, we are proposing to use the pervious pavement as a control
device and will not be seeking the credit for using the permeable pavement.
8. The infiltration trench or basin should be designed to handle runoff
for the 1.5" design storm. In addition, all runoff in excess of the
design storm must bypass to a vegetated filter instead of entering the
basin or trench and prior to being discharged into a receiving stream.
The vegetated filter must be at least 50 feet long for SA waters. Please
show this filter area on the plans, located either in a common area or
in an access / drainage easement.
The infiltration basin has been sized to contain the 1.5" storm. An emergency
overflow weir has been provided to pass larger storms. The overflow will pass
through an existing, undisturbed vegetative filter before exiting the site.
This area exceeds 5o foot in length.
9. An offline bypass structure must be provided to route larger storms
to the vegetated filter. A spillway on the infiltration basin does not
meet this requirement. Please provide a bypass structure detail showing
a trash rack with c/= 6" square openings, and the necessary bypass weir
and pipe elevations. Several types of bypass structures are acceptable.
Per our discussion, due to the flatness of this site, the high water table,
and the depth of the infiltration basin, a bypass structure and piping cannot
be used. In order to pass larger storms, we have proposed a overflow weir and
vegetative filter to pass the storm water.
10. For larger storms in the pervious pavement area, stormwater
overtopping the curb and running out existing ditches is not acceptable.
This area should be graded such that runoff flows to an inlet or Swale
and eventually to a vegetated filter prior to being discharged into a
receiving stream.
Per our discussion, eliminating the curb would be the best option. The
parking lot will be regarded so that water is slowly directed towards the
edges of the parking lot. As smaller storms work there why toward the edges,
the water will pass through the pervious pavement. Larger storms will runoff
into the 2 existing side ditches and run off site. These vegetative side
ditches are approximately 600 feet long.
3 of 6/26/2008 10:33 AM

Re: Tiller School
11. Please provide a table of elevations, areas, incremental volumes,
and accumulated volumes to demonstrate that the minimum required volume
has been provided.
An elevations table will be provided.
12. Please provide dimensions for each line and arc formed by the bottom
contour of the infiltration basin.
The bottom of the infiltration basin will be labeled.
13. All roof drainage must be directed to the system. Show the roof
drain collection piping on the plans.
Per our discussion, all roof drainage from the new buildings will be directed
to the infiltration basin. Rooftop runoff from the existing buildings will be
directed to a small new infiltration basin where it can be treated. The
existing rooftop runoff is currently running directly off site.
14. The elevations, areas, and volumes reported on the supplements
should match up to the numbers used in the calculations and shown on the
plan details.
All numbers will be matched to the calculations.
15. Please remember that a change to one number may have a domino effect
on other numbers. Please check all plans, calculations and forms and
make changes as needed.
Comment noted
Please note that this request for additional information is in response
to a preliminary review. The requested information should be received in
this Office prior to July 23, 2008, 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 need additional time to submit the information, please mail,
email or fax your request for a time extension to the Division at the
address and fax number at the bottom of this letter. The request must
indicate the date by which you expect to submit the required
information. The Division is allowed 90 days from the receipt of a
completed application to issue the permit.
The construction of any impervious surfaces, other than a construction
entrance under an approved Sedimentation Erosion Control Plan, is a
violation of NCGS 143-215.1 and is subject to enforcement action
pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all
correspondence. Any original documents that need to be revised have been
sent to the engineer or agent. All original documents must be returned
or new originals must be provided. Copies are not acceptable. If you
have any questions concerning this matter please feel free to call me at
[phone] or email me at [e-mail].
Sincerely,
Steve G. Pusey
Environmental Engineer
ENB/sgp: S:\WQS\STORMWATER\ADDINFO\2007\080529.jun08
cc: Brad Rhinehalt, PE, ANC Engineering, inc., Cary, NC
Steve Pusey
Steve Pusey
4 of 5 6/26/2008 10:33 AM

RE: 'filler School
m
Subject: RE: Tiller School
From: "Tim Summerville" <[e-mail]>
Date: Thu, 26 Jun 2008 08:17:36 -0400
To: "Steve Pusey" <[e-mail]>
CC: 'Brad Rhinehalt" <[e-mail]>
Steve,
ND S per e0,7v.ersC47;,,,
L-f�a(q Lewi$ n-�l
Please find below my responses to your comments in blue as we discussed over the
phone. Let me how to proceed as soon as possible so that we can get revised plans
back to you.
Thanks
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
[e-mail]
www.ancengineering.com
-----Original Message -----
From: Steve Pusey[mailto:[e-mail]]
Sent: Wednesday, June 25, 2008 4:16 PM
To: Tim Summerville
Subject: Tiller School
Tim,
Please reference our request for additional information below. A formal
letter will be sent via mail.
Regards,
Steve Pusey
DWQ-Wilmington Office
----------------------------------------------
June 25, 2008
Ken Murphy, President of Board of Directors
The Tiller School of Carteret County
1950 Hwy. 70 East
Beaufort, NC 28516
Subject: Request for Additional Information
Stormwater Project No. SW8 080529
The Tiller School
Carteret County
Dear Mr. Murphy:
The Wilmington Regional Office received a State Stormwater Management
Permit Application for The Tiller School on May 27, 2008. 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. Please either delineate all wetlands on site, disturbed or
undisturbed, or note on the plans that none exist.
There are no wetlands on site and the revised plan will state this.
I of
6/26/2008 9:12 AM

w —{
Michael P. Easley, Governor
William G, Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleco If Sullins Director'
Division of Water Quality
June 25, 2008
Ken Murphy, President of Board of Directors
The Tiller School of Carteret County
1950 Hwy. 70 East
Beaufort, NC 28516
Subject: Request for Additional Information
Stormwater Project No. SW8 080529
The Tiller School
Carteret County
Dear Mr. Murphy:
The Wilmington Regional Office received a State Stormwater Management Permit Application
for The Tiller School on May 27, 2008. A preliminary review of that information has determined
that the application is not complete. The following information is needed to continue the
stormwater review:
Please either delineate all wetlands on site, disturbed or undisturbed, or note on the
plans that none exist.
2. Please locate each BMP and all swales in common areas and/or access / drainage
easements, to be recorded.
3. The drainage area for each basin or trench should be clearly delineated and
numbered to match up to the calculations and supplement. The relocated building is
considered new impervious area and should be located in a drainage area to be
treated by an infiltration basin.
It appears that you have used an infiltration trench supplement for an infiltration basin.
A separate supplement must be provided for a basin or trench, as applicable. Please
be sure to use the correct form, depending on whether you have a basin or trench.
Basin section detail should show 3:1 side slope for sides stabilized with vegetation.
Permeable pavement systems should only be used for low traffic volume, less than
100 vehicles per day. Reference section 18.3.3 of BMP manual for this and additional
design requirements.
7. If desired, you can complete the permeable pavement supplement to determine credit
for the proposed pervious concrete area. This credit will lower the percent impervious,
thus lowering the required storage volume for the necessary infiltration trench or
basin. If a trench is installed underneath the parking lot, then pervious credit will not
be allowed.
8. The infiltration trench or basin should be designed to handle runoff for the 1.5" design
storm. In addition, all runoff in excess of the design storm must bypass to a vegetated
filter instead of entering the basin or trench and prior to being discharged into a
receiving stream. The vegetated filter must be at least 50 feet long for SA waters.
Please show this filter area on the plans, located either in a common area or in an NortltCaroGna
access / drainage easement Jl aura//y
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone [phone] Customer Service
Wilmington Regional Office Internet:- L'"v,.nmaterqualitv.ore Fax [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled110% Post Consumer Paper

The Tiller School of Carteret County
June 25, 2008
Stormwater Application No. SW8 080529
9. An offline bypass structure must be provided to route larger storms to the
vegetated filter. A spillway on the infiltration basin does not meet this
requirement. Please provide a bypass structure detail showing a trash rack
with </= 6" square openings, and the necessary bypass weir and pipe
elevations. Several types of bypass structures are acceptable.
10. For larger storms in the pervious pavement area, stormwater overtopping the
curb and running out existing ditches is not acceptable. This area should be
graded such that runoff flows to an inlet or swale and eventually to a vegetated
filter prior to being discharged into a receiving stream.
11. Please provide a table of elevations, areas, incremental volumes, and
accumulated volumes to demonstrate that the minimum required volume has
been provided.
12. Please provide dimensions for each line and arc formed by the bottom contour
of the infiltration basin.
13. All roof drainage must be directed to the system. Show the roof drain collection
piping on the plans.
14. The elevations, areas, and volumes reported on the supplements should match
up to the numbers used in the calculations and shown on the plan details.
15. Please remember that a change to one number may have a domino effect on
other numbers. Please check all plans, calculations and forms and make
changes as needed.
Please note that this request for additional information is in response to a
preliminary review. The requested information should be received in this Office prior to
July 23, 2008, 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 need additional time to submit the information, please mail, email or fax
your request for a time extension to the Division at the address and fax number at the
bottom of this letter. The request must indicate the date by which you expect to submit
the required information. The Division is allowed 90 days from the receipt of a
completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance
under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-
215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. Any
original documents that need to be revised have been sent to the engineer or agent. All
original documents must be returned or new originals must be provided. Copies are not
acceptable. If you have any questions concerning this matter please feel free to call me
at [phone] or email me at [e-mail].
Sincerely,
�� -+--
S evf e G. Pusey /
Environmental Engineer
ENB/sgp: S:\WQS\STORMWATER\ADDINFO\2007\080529.jun08
cc: Brad Rhinehalt, PE, ANC Engineering, inc., Cary, NC
Steve Pusey
W �' 3 Page 2 of 2

Letter of Transmittal
ANC # 07-521
Date June 4, 2008
TO: Linda Lewis
Water Quality Section Storm Water
127 Cardinal Drive Extension
Wilmington, NC 28405
RE: Tiller School
Revised Drawings — Extra Copy
We are sending the following:
[ ] Bluelines [ ] Samples
[ x ] Originals [ ] Submittal
[ ] Specifications [ ] Addenda
[ ] Shop Drawings [ ] Copy of Letter
[ ] Other:
VIA: [] Mail [x] Overnight
117 Cenlrerveit Court
Cary, NC 27513-2015
V
RMCEavED
JUN 0 6 2008
BY: i
Purpose: . '
[ ] For Approval [ ] Returned for Approval
[ ] For Review [ ] For Your Use
[ ] Approved as Noted [ x ] As Requested
[ ] Other:
[ ] 2°" Day [X] Other: HAND DELIVERY
Quantity
Drawing/Spec
Latest Date
Description
1
Revised
Construction
Drawings
5/22/08
Extra copy of revised drawings per your 6/04/08
email request.
BY: Tim Summerville
ANC ENGINEERING, INC.
Cc: File

Tiller School
Subject: Tiller School
From: Linda Lewis <[e-mail]>
Date: Wed, 04 Jun 2008 10:11:08 -0400
To: Tim Summerville <[e-mail]>
Tim:
You only submitted 1 set of the 5/22/08 revised plans. We require a minimum of 2
sets of plans. Please send in another set of the 5/22/08 plans. The application
cannot be accepted for review until it is complete.
Linda
1 of 1 6/4/2008 10:16 AM

117 Ceti trewest Coo it
Cary, RC 27513-2015
®1 Y t/ /'77�Ir7L'eYing, /nC. Phone: [phone]
Civi(C'ngineers & LnnASurveyorn (((,,,,J// ��, Fax: [phone]
TRANSMITTAL LETTER
May 22, 2008
To: Linda Lewis
Water Quality Section Storm water
127 Cardinal Drive Ext. RECEIVEr)
Wilmington, NC 28405
MAY 2 7 2008
Re: Tiller School
Storm water management permit re -submittal By'------
Linda,
Please find enclosed the following items:
1 copy of the revised plans
1 revised copy of the infiltration trench supplements for each proposed storm
water control system.
This package corresponds to an e-mail sent to you on May 22, 2008. All revisions are
based off of an e-mail received May 20, 2008. In addition to the revised items, we
would like to offer the following responses based on your e-mail:
1. Please use the original signature page for the infiltration basin.
2. 1 have revised the grading and raised the infiltration basin and the parking areas to
be 2 feet above the SHWT. I have included the revised volume calculations on sheet 2.
3. 1 revised the pervious pavement supplement to report the bottom, overflow and top
elevations. I have also revised the grading to make the permeable pavement sections
flatter and have directed the impervious pavement sections towards the pervious areas.
Thank you for your assistance with this review and please feel free to contact by e-mail
or at 919-439-7454.
Sincerely,
ANC Engineering, Inc.
Tim Summerville
Enclosures

Tiller School
Subject: Tiller School
From: Linda Lewis <linda.lewis n ncmail.net>
Date: Tue, 20 May 2008 13:59:51 -0400
To: Tim Summerville <[e-mail]>
Tim
The Division received an incomplete stormwater application for the subject project
on may 13, 2008. The following items are needed in order to accept the application
for review:
1. The revised application was not signed. Do you want me to use the original
signature page from the application that was previously returned as incomplete?
2. The bottom of the infiltration basin and the permeable pavement must be a
minimum of 2' above the SHwT.
3. A bottom, overflow and top elevation must be reported on the infiltration
supplement for the permeable pavement basin. The permeable pavement should be flat,
or have very little slope in order to claim the most storage volume out of the
system. Depending on the overflow elevation (i.e., the lowest point in the system)
sloping the pavement too much may render the higher part unusable.
Please either submit the requested items within 5 business days, or the application
will be returned.
Linda
1 of 1 5/20/2008 2:00 PM

117 Centrewest Court
l Y C Engineering, Inc. Cary, NC 27513-2015
Phone: [phone]
Cii(Engineeo d Good Surveyr's Fax: [phone]
TRANSMITTAL LETTER
To: Linda Lewis
Water Quality Section Storm water
127 Cardinal Drive Ext.
Wilmington, NC 28405
Re: Tiller School
Storm water management permit re -submittal
Linda,
April 24, 2008
FtECEIVEIM
MAY 13 2008
BY:
Please find enclosed the following items:
• 2 copies of the revised plans
• 1 original and 1 copy of the revised permit application
• 1 copy of the infiltration trench supplements for each proposed storm water
control system.
• 1 copy of the revised narrative and storm water control calculations
• 1 copy of the signed Operation and Maintenance agreements
All revisions were made based on your review letter we received via fax dated March
25, 2008. In addition to the revised items, we would like to offer the following
responses based on your letter;
1. The receiving stream name and classification have been added to the
application.
2. The drainage area acreages have been added to the application.
3. The calculations have been revised to count the entire permeable pavement as
impervious BUA.
4. The main drive aisle has been changed from permeable pavement to solid
asphalt. All of the parking areas are to remain as permeable pavement.
5. A section detail for the permeable pavement has been provided on sheet of the
plan set.
6. A column has been completed for each infiltration system.
7. A supplement form, checklist, and signed Operation and Maintenance plan has
been provided for each infiltration system.

-2-
8. The BUA calculations have been adjusted on both the application and the
narrative.
9. Signed and sealed calculations have been included. The calculations have been
incorporated into the storm water impact narrative.
10. A dimensioning plan has been provided on sheet 1 of the plan set.
11. The location map has been expanded to include the intersection of US-70 with
NC Highway 101.
12. Vincent Lewis has visited the site in late May, 2007. It was based on his
recommendation to place the infiltration basin in the proposed location and to
utilize the permeable pavement.
13. In order to promote infiltration from small storms, and not have significant
ponding in parking areas during larger storms, 4" curb as been proposed around
the perimeter of the site. Smaller storms will remain on site and infiltrate through
the pavement while larger storms will overtop the curb so large puddles will not
be sitting in the parking areas.
14. The infiltration supplement has been revised to report the surface area of the
pervious pavement.
If you have any questions or require any additional information, please feel free to
contact me at 919-439-7454
Sincerely,
ANC Engineering, Inc.
Tim Summerville
Enclosures

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Re: Tiller School Stormwater Permit
Subject: Rt: Tiller School Stormwater Permit
From: Linda Lewis <[e-mail]>
Date: Thu, 24 Apr 2008 10:31:52 -0400
To: Tim Summerville <[e-mail]>
What you submit to us depends on what you're doing. If this is a new application or
if we returned an incomplete application, including the check, then you will need
to resend everything. If we accepted your package, and deposited the check, and
only requested additional information, then you would submit only the revised
information.
If you know your permit / application number, please be sure to reference it on
your correspondence.
Linda
Tim Summerville wrote:
Thank you for your help, Linda
have
updated our package and will
re -submitting, would you like
package,
or only what we have revised?
Thank you for your help and I
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
[e-mail]
www.ancenQineerinQ.com
-----Original Message -----
From: Linda Lewis [mailto:
April 18, 2008 3:36 PM
To: Tim Summerville
Cc: Janet Russell
Subject: Re: Tiller School
Tim:
That cleared things up for me. I
be re -submitting today. When
us to re -send everything in the
hope to hear from you soon.
[e-mail]] Sent: Friday,
Stormwater Permit
I'm sorry I haven't responded sooner- got a little sidetracked.
For low density projects that have existing pre-1988 BUA and are
expanding, the percent BUA is based on an adjusted site area that
is calculated by subtracting only the existing pre-1988 BUA from
the total site area (any post-1988 BUA constructed without a permit
may not be subtracted) and finding the percent impervious based on
the total post 1988 and new BUA divided by the adjusted site area.
Example: 6 acre site area with 1 acre of pre-1988 BUA and 0.5 acres
of post-1988 unpermitted BUA. Adjusted site area is 6 - 1 = 5
acres. If the
1 of 4 4/28/2008 10:45 AM

Re: Tiller School Stormwater Permit
project is located in Brunswick, New Hanover or Onslow county and
is within 1/2 mile of SA waters, it is subject to the NPDES Phase
II rules,
which limit the density to 12%, so the new BUA (all post -1988)
would be
limited to no more than .12 x 5 = 0.6 acres. With .5 acres of
existing post-1988 BUA, the actual new BUA can be no more than 0.6
- 0.5 = 0.1 acres. For non -SA Phase II projects, the density limit
is 24%, or .24 x 5 = 1.2 acres of post-1988 BUA. For all other
coastal counties, the density limit for SA waters is 25% and the
limit for non -SA waters is 30%. So, .25 x 5 = 1.25 acres, or .3 x 5
= 1.5 acres.
I'm not sure why permeable pavement could not be used. It may be
that at
the time you asked about he permeable pavement, we did not have
anything
in regard to supplement forms or procedures in place. The BMP
manual lists the specifics for using permeable pavement. They
include:
1. Sloped at less than 0.5%.
2. Minimum soil infiltration rate of 0.52 inches per hour in the
first 3
feet of soil.
3. Maximum of 2 acre-feet of soil per acre disturbed can be graded
for the pavement footprint.
4. Soil texture in top 3 feet no finer than Loamy Very Fine Sand.
5. No concentrated flows from roofs (i.e., gutter downspouts) or
other impervious surfaces.
6. A low traffic volume- no more than 100 cars per day.
7. SHWT at least 2' below base of pavement or gravel storage layer.
8. No overhanging trees.
9. No upland ground disturbance that could potentially clog the
system.
If you can demonstrate these things, plus whatever other conditions
and requirements are listed in the Permeable Pavement chapter in
the BMP design Manual, you can use permeable pavement. Keep in mind
that if the project is within 1/2 mile of SA waters, the managed
grass credit is cut
in half. Instead of 40% or 60%, you could only get 20% or 30%
credit.
You would report the reduced amount of built -upon area for the
permeable
2 of 4 4/28/2008 10:45 AM

Re: Tiller School Stormwater Permit
pavement in a separate box on the application form. There is a
Permeable
Pavement supplement form and Operation and Maintenance plan
available on
the website to assist in calculating the correct amount of BUA to
be credited and the correct amount to be reported as BUA.
The website address is: http://h2o.enr.state.nc.us/su/bmp forms.htm
Linda
Tim Summerville wrote:
Linda,
Good morning. I am working on the Tiller School
Project located in Beaufort, North Carolina and I
had a couple questions pertaining to your review
and the permit application.
* Section III, line 7 of the application asks
for Built Upon Area
percentage. Since this project is an
addition to an existing
site, is BUA all of the impervious area post
addition on the
site, or is it just the areas that we are
improving?
* Your comment number 3 says that the permeable
pavement cannot be
used for BUA credit. Table 18-1 of the
current BMP manual
states that 30% of permeable pavement area
can be counted as
managed grass. It is my understanding that
BUA counts
impervious areas. Is managed grass and BUA
separate? Does
pervious pavement count as 100% impervious?
3 of 4 4/28/2008 10:45 AM

Re: Tiller School Stormwater Permit
I am having some confusion in filling out the storm
water permit application as it pertains to the BUA
calculation. Please give me a call at the number
below or respond directly to this e-mail.
Thanks
ANC Engineering, Inc.
Tim Summerville
117 Centrewest Ct.
Cary, NC 27513
919.439.7454
[e-mail]
<mailto:[e-mail]>
www.ancengineering.com
<http://www.ancengineering.com>
4 of 4 4/28/2008 10:45 AM

ATF9 Michael F. Easley, Governor
�G William G. Ross Jr., Secretary
rNorth Carolina Department of Environment mid Natural Resources
i
Y Colecn IF Sullins Director
Division of Water Quality
FAX COVER SHEET
Date: March 25, 2008 No. of Pages: 4444444i/I/
To: Tim Summerville From: Linda Lewis
Company: ANC Engineering Water Quality Section Stormwater
FAX #: [phone] FAX # [phone]
Phone # [phone]
DWQ Stormwater Project Number: SW8 not assigned
Project Name: Tiller School
MESSAGE:
[1 1
On March 19, 2008, the Division received an incomplete Stormwater Management Permit
application regarding the subject project. The application cannot be accepted for review until
the following items are addressed:
Add the receiving stream name and its classification to Section 111.9 of the
application. If you need help in making this determination, please complete and
submit the attached "Water Quality Classification" request form. Depending on the
classification of the receiving stream, sufficient storage for either the 1.0" storm (all
non -SA classifications) or the 1.5" storm (all SA classifications) must be provided.
Add the drainage area acreage to Section 111.9 of the application.
Infiltration systems located underneath of permeable pavement are permittable,
however, no BUA credit for the use of the permeable pavement can be given.
Please revise the calculations to account for the entire permeable pavement area as
impervious.
4. Permeable pavement is limited to a maximum of 100 cars per day. Unless you can
demonstrate that less than 100 cars per day will utilize this parking lot, you may want
to consider redesigning the site to have the driveway as regular concrete or asphalt,
and only the parking spaces as permeable pavement.
5. Please add section details for the permeable pavement.
6. It appears that 2 separate infiltration systems are being proposed, one a trench
system in the front of the property under the permeable pavement and the second, a
basin in the rear of the property. Please complete 1 column on the application for
each proposed infiltration system.
7. Please submit a completed supplement form, checklist, and signed Operation &
Maintenance plan for the proposed infiltration basin.
No liCarrilum
,Al zturally
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone [phone] Customer Service
Wilmington Regional Office Internet: www.newaterguality.org Fax [phone]
An Equal Opportunity/Affirmative Action Employer - 50% Recycledl10% Post Consumer Paper

Tiller School
March 25, 2008
Page 2 of 2
8. The BUA reported in the narrative is 1.25 acres (37.1 %), whereas the
application lists only 1.08 acres (32%) proposed.
Please provide signed, sealed and dated design calculations for each
proposed infiltration system.
10. Please provide a dimension plan, including dimensions for all of the
proposed and existing BUA.
11. Please add the nearest intersection of 2 major roads to the vicinity
map. A major road is any 1, 2 or 3 digit NC, US or interstate highway.
12. Has our soils scientist, Vincent Lewis, confirmed the information in the
soils report? If he has not, I've attached a "Site Visit" request form to
be completed and submitted. An appointment for Vincent to visit the
site and verify the soils information will then be scheduled.
13. All of the runoff from the permeable pavement must be collected and
directed to the storage area underneath. The proposed grading of the
permeable pavement indicates that in many areas, runoff will simply
sheet flow off of the permeable pavement. Please revise the grading
around the perimeter of the permeable pavement such that the runoff
is contained and will not sheet flow off.
14. You will need to tweak the infiltration trench supplement. Essentially,
the area of the parking lot is the trench, but that supplement asks for a
trench length, width and height. The best thing to do is to combine the
length and width and report the surface area of the pervious pavement
in square feet.
cc: Ken Murphy, President, BOD for Tiller School
ENB/arl: S:\WQS\STORMWATER\ADDINFO\2008\tillerschool.mar08

L,Engineering, Inc.
117 Cenlre%vest Court
Cary, NC 27513-2015
Phone: [phone]
Fax: [phone]
Letter of Transmittal
Job # 07-521
Date March 18, 2008
TO: Rhonda Hall
Surface Water Protection
We are sending the following:
[ ] Bluelines [ ] Check
[ ] Originals [ ] Submittal
[ X ] Specifications [ ] Addenda
[ ] Shop Drawings [ ] Contract
[ ] Other:
VIA: [] Mail [x] Overnight
c�z �)rr)
RE: Tiller School
Purpose:
[ ] For Approval [ ] Returned for Approval
[ ] Approved as Submitted [ ] For Your Use
[ ] Approved as Noted [ X] As Requested
[ ] Other:
[ ] 2"J Day [ ] Other: HAND DELIVERY
Quantity
Drawing/Spec
Latest Date
Description
2 copies
Plans
1
Specifications
REMARKS:
Please note changes based on the renumbering lots and phase lines per Engineer.
Thanks,
BY: Tim Summerville
ANC ENGINEERING, INC.
R2ECEIVED
MAR 19 2008
BY:.

'May 15 07 06:18p Brad Rhinehalt 919-552-6124 p.2
INFILTRATION SITE VISIT REQUEST R I�
Name of the Project: TL ELF fL S eNUo L— _ l >EA-(Alfififd Ivy
Location (attach a clear vicinity map): Us 7U &Arz ef— &9'kA Pil
Street
adidressss. SR
number, tommunlly�,.�sic.
C�VCj' J lJw+ �vJ w� t 1
Directions from the nearest major intersection:
Owner/Applicant Na
Consultant
-!9cJ'ioaL
Consultant Contact information:'I t'
A,�r� Phony
Existing ground elev. @basin/trench=
SHWT elev.=
SHWT plus 2' (max. bottom elev.)=
a
Q IEEE E12A c,5-
3q
fax, email, etc. O /..G t'),1�—/L� . co A
#1 #2 #3 #4 #5 #6 #7 #8
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:Oo
Dateffime of Soils Investigation: U,d k S
Summary/Comments:
Q C..!
n.ftr� CUp*&s • M
'I� 4� G'Hi1°1 0401
All proposed infiltration areas and existing, active utility lines located within the proposed basinftreno It
must be marked and flagged. If these areas are not flagged, the Soils Scientist reserves the right to
decline to do the investigation. If the proposed Infiltration system will be located in an area of existing �R p���
pavement and there is no open area nearby, equipment capable of breaking through the impervious r
layer must be provided. The soils investigation does not take the place of a soils report prepared by
an appropriate professional. The Soils Scientist will only verify the soil conditions that are reported in
the Soils Report, and make a determination as to the suitability of the site to meet the infiltration
design requirements under NCAC 2HAD00, and assumes no liability should the system fail.

May 15 07 06:19p Brad Rhinehalt 919-552-6124 p.3
14
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May 15 07 06:19p Brad Rhinehalt 919-552-6124 p.4
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May 15 07 06:20p Brad Rhinehalt 919-552-6124 p.6
From:
04/18/21107 15:50
Infiltration Evaluation
Tiller School
Beaufort, North Carolina
ECS Project No. 22.12999
April 13, 2007
Location DCDth coil Description
#1 0-24" Black SILT w/ sand
9708 P.005/005
Seasonal Higb Water Table was estimated to be at 18 inches below the existing
grade elevation.
Groundwater was encountered at 24 inches below the existing grade elevation.
Location D-ert Soil Description
#2 0-24" Black SELT w/ sand
Seasonal High Water Table was estimated to*be at 18 inches below the existing
grade elevation.
Ground water was encountered at 24 inches below the existing grade elevation,
Location peoth Soil Description
#3 0-10" Brown silty SAND (fill)
10"-20" Brown fine SAND w/silt
20"-30" Grey sandy CLAY
Seasonal High Water Table was estimated to be at 20 inches Wow the existing
grade elevation.
lu itration Rate: 0.017 inches per minute (0.99 inches per hour)
Test was conducted at 10 inches below existing grade elevation
Ground water was encountered at 30 inches below the existing grade elevation.
Location Depth Soil Description
#4 0"-20" Brown fine SAND w/silt
20"-30" Grey sandy CLAY
Seasonal High Water Table was estimated to be at 18 inches below the existing
grade elevation.
Groundwater was encountered at 30 inches below the existing grade elevation.