SW8130103_HISTORICAL FILE_20130222

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 Bola 3
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
© HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
20�30222
YYYYMMDD

AM
pipaa [NR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Charles Wakild, P. E.
Governor Director
February 22, 2013
Dr. Babatunde Olatidoye, Member
Coba Ventures, LLC
PO Box 3743
Wilmington, NC 28406
Subject: State Stormwater Management Permit No. SW8130103
Serenity Point
High Density Commercial Infiltration Trench / Chamber Project
New Hanover County
Dear Dr. Olatidoye:
John E. Skvarla, III
Secretary
The Wilmington Regional Office received a complete State Stormwater Management Permit Application for Serenity
Point on February 21, 2013. Staff review of the plans and specifications has determined that the project, as
proposed, will comply with the Stormwater Regulations set forth in Session Law 2008-211 and Title 15A NCAC
2H.1000. We are forwarding Permit No. SW8130103 dated February 22, 2013, for the construction, operation, and
maintenance of the BMP's and built -upon area associated with the subject project.
This permit shall be effective from the date of issuance until February 22, 2021, 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 by filing a written petition with the Office of Administrative Hearings (OAH). The written petition
must conform to Chapter 150B of the North Carolina General Statutes, and must be filed with the OAH within thirty
(30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing
fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via
telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit
shall be final and binding.
If you have any questions, or need additional information concerning this matter, please contact Kelly Johnson, at
[phone].
Sincerely,
For Charles Wakild, P.E., Director
Division of Water Quality
GDS/kpj: S:1WQS1StormwaterlPermits & Projects120131130103 HD12013 02 permit 130103
cc: Phillip G. Tripp, PE
Inspector, New Hanover County Building Inspections
Beth E. Wetherill, New Hanover County Engineering
Division of Coastal Management
Wilmington Regional Office Stormwater File
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Locaaon 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: 91M07-63001 FAX [phone] DENR Assistance 1-877-623-6748 Noe
hCarolina
Internet. w .nmatemuahty.ora Naturally

State Stormwater Management Systems
Permit No. SW8130103
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
Coba Ventures, LLC
Serenity Point
4616 Serenity Point, Wilmington, New Hanover County
FOR THE
construction, operation and maintenance of two (2) infiltration trenches in compliance with the provisions of Session
Law 2008-211 and 15A NCAC 2H .1000 (hereafter collectively and separately referred to as the "stormwaterrulesl
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 February 22, 2021, and shall be subject to the following
specified conditions and limitations:
I. DESIGN STANDARDS
This entire project is within 575ft of a saltwater outstanding resource water (ORW). Per 15A NCAC 2H
.1007(2), the ORW Area of Environmental Concern (AEC) is delineated on the plans. The area inside the
ORW AEC must maintain a 25% maximum impervious area.
2. This project is within a half mile of and draining to shellfish (SA) waters. Per SL2008-211, Section 2(b),
(1)(c), stormwater discharges are prohibited. This project complies with this requirement by infiltrating the
design stone.
3. Both infiltration trenches have been designed to infiltrate the 10yr24hr storm at half the infiltration rate
reported in the soils report. Therefore the oftline bypass and the vegetated filter strip are not required for
either infiltration trench.
4. This permit is effective only with respect to the nature and volume of stormwater described in the application
and other supporting data.
5. This stormwater system has been approved for the management of stormwater runoff as described in
Section 1.8 of this permit. The stormwater control has been designed to handle the runoff from 11,525
square feet of impervious area in drainage area 1 and 10,775 square feet of impervious area in drainage
area 2.
6. The tract will be limited to the amount of built -upon area indicated in Section 1.10 of this permit, and as
shown on the approved plans. The built -upon area for the future development is limited to 840 square feet in
each drainage area.
Page 2 of 7

State Stormwater Management Systems
Permit No. SW8130103
7. 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.
8. The runoff from all built -upon area within the permitted drainage area of this project must be directed into
the permitted stormwater control system.
9. The project shall provide a 50' wide vegetated buffer adjacent surface waters, measured horizontally from
and perpendicular to the normal pool of impounded structures, the top of bank of streams and rivers, and
the mean high water line of tidal waters.
10. The following design criteria have been permitted for the infiltration trench system and must be provided and
maintained at design condition:
Trench #1 Trench #2
a. Drainage Area, acres:
0.48 0.38
Onsite, ftz:
20,780 16,770
Offsite, ftz:
0 0
b. Total Impervious Surfaces*, ft2:
11,525 10,775
Onsite, ft2:
11,525 10,775
Offsite, ftz:
0 0
c. Design Storm, inches (10yr24hr Storm):
7.00 7.00
d. Trench Length, feet:
e. Trench Width, feet:
See Plans
f. Trench Depth, feet:
g. Bottom Elevation**, FMSL:
3.75 4.00
h. Bottom Surface Area, ft2:
2,635 1,677
i. Bypass Weir Elevation, FMSL***:
N/A
j. Chamber Model Number.:
ER-501 Ecorain Tank
k. Number of Chambers:
See Plans
I. Permitted Storage Volume, ft3:
5,682 3,616
m. Predevelopment 1 yr 24 hr peak flow, cfs:
0.84 0.84
n. Type of Soil:
Sand Sand
o. Expected Infiltration Rate, in/hr:
7.70 3.50
p. Seasonal High Water Table, FMSL:
1.75 2.00
q. Time to Draw Down 10yr24hr Storm, hours:
7.87 25.61
(at half reported rate)
r. Receiving Stream/River Basin:
ICWW
s. Stream Index Number:
18-87-(25.5)
t. Classification of Water Body:
SA; ORW
*Pool decks must be constructed of wooden slatted decking such that no impervious area is created as shown on the
permitted plans unless a permit modification or plan revision is approved prior to installation.
*The stone base below each trench is required for structural integrity, and is not a part of the infiltration mechanism.
Therefore, the trenches are 2ft above the seasonal high water table, but the stone base is within 2ft. The `bottom
elevation' refers to the bottom of the trenches.
*** Both trenches can infiltrate the 10y24hr storm event at half the reported rate without discharge. Therefore no
vegetated filter strip or bypass is required.
Page 3 of 7

State Stormwater Management Systems
Permit No. SW8130103
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its
intended use prior to the construction of any built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired
immediately.
3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted
stormwater system functions at 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. 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.
5. 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.
6. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum
of ten years from the date of the completion of construction.
7. Records of maintenance performance activities must be kept for each permitted BMP. The reports will
indicate the date, activity, name of person performing the work and what actions were taken.
S. 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.
9. Access to the stormwater facilities shall be maintained via appropriate easements at all times.
10. The permittee shall submit to the Director and shall have received approval for revised plans, specifications,
and calculations prior to construction, for any modification to the approved plans, including, but not limited
to, those listed below:
a. Any revision to any item shown on the approved plans, including the stormwater management
measures, built -upon area, details, etc.
b. Redesign or addition to the approved amount of built -upon area or to the drainage area.
C. Further development, subdivision, acquisition, lease or sale of any, 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.
d. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
11. The permittee shall submit final site layout and grading plans for any areas noted as future development on
the approved plans, prior to construction.
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.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW8 130103
III. GENERAL CONDITIONS
Approved plans, application, supplement forms, Operation and Maintenance agreements, design
calculations and specifications for this project are incorporated by reference and are enforceable parts of the
permit.
2. This permit is not transferable to any person or entity except after notice to and approval by the Director. At
least 30 days prior to a change of ownership, or a name change of the permittee or project, or a mailing
address change, the permittee must submit a completed and signed Name/Ownership Change form to the
Division of Water Quality, accompanied by the appropriate documentation as listed on the form. The
approval of this request will be considered on its merits and may or may not be approved.
3. The permittee is responsible for compliance with all permit conditions until such time as the Division
approves the transfer request. Neither the sale of the project area in whole or in part, nor the conveyance of
common area to a third party constitutes an approved transfer request.
4. 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.
5. 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.
6. 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.
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.
8. The permit issued shall continue in force and effect until revoked or terminated. 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.
9. Unless specified elsewhere, permanent seeding requirements for the stormwater controls must follow the
guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual.
10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking
and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in
Session Law 2008-211, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et. al.
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 22^d day of February 2013.
NOR H CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
r haries Wak' , P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 5 of 7

State Stormwater Management Systems
Permit No. SW8130103
Serenity Point
Stormwater Permit No. SW8 130103
New HanoverCounty
Designer's Certification
I, , as a duly registered in the State of North Carolina,
having been authorized to observe (periodically/ weekly/ full time) the construction of the project,
(Project)
for (Project Owner) hereby state that, to the best of my abilities, due care
and diligence was used in the observation of the project construction such that the construction was observed to be
built within substantial compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
SEAL
Page 6 of 7

State Stormwater Management Systems
Permit No. SW8130103
Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage.
2. The drainage area to the system contains no more than the permitted amount of built -upon area.
3. All the built -upon area associated with the project is graded such that the runoff drains to the
system.
4. All roof drains are located such that the runoff is directed into the system.
5. The bypass structure weir elevation is per the approved plan.
6. The bypass structure is located per the approved plans.
7. A Trash Rack is provided on the bypass structure.
1
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-circuiting of the system.
11. The permitted amounts of surface area and/or volume have been provided.
12. All required design depths are provided.
13. All required parts of the system are provided.
14. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Regional Office
Inspector, New Hanover County Building Inspections
Page 7 of 7

DWQ USE ONLY
Date Received
Fee Paid
Permit Number
'
05 D�
Applicable Rules: ❑ Coastal SW - 1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Constructs
(select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ M mt Plan:
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This fonn umy be photocopied for use as an original
I. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
2. Location of Project (street address):
City:Wilmington County:New Hanover Zip:28412
3. Directions to project (from nearest major intersection):
From the intersection of Masonboro Loop Rd (SR1492) and Channel Haven Dr (SR1620), travel east 250 If on
Channel Haven Dr. and turn left onto Channel Haven Dr N., travel 0.53 mile to Serenity Point. Turn left onto
Serenity Point. Site is at the end of the road.
4. Latitude:34° 09' 04" N Longitude:77° 51' 35" W of the main entrance to the project.
II. PERMIT INFORMATION:
1. a. Specify whether project is (check one): ®New ❑Modification ❑ Renewal w/ Modificationt
tRenemals with modifications also requires SWU-102 - Renewal Application Form
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number , its issue date (if known) and the status of
construction: ❑Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification
2. Specify the type of project (check one):
❑Low Density [-]High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from DWQ
requesting a state stormwater management permit application, list the stormwater project number, if
assigned, and the previous name of the project, if different than currently
proposed, �-s
4. a. Additional Project Requirements (check applicable blanks; information on required state etrm! can b' V�
obtained by contacting the Customer Service Center at 1-877-623-6748): JAN 0 3 1013
❑CAMA Major ❑Sedimentation/Erosion Control: ac of _ pturbed Area
❑NPDES Industrial Stormwater BY.
❑404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:
5. Is the project located within 5 miles of a public airport? ❑No
If yes, see S.L. 2012-200, Part VI: http://portal.ncdenr.(
2012
Fomt SWU-101 Version 06Aug2012 Page I of

Ili. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the project):
Applicant/Organization:Coba Ventures, LLC
Signing Official & Title:Babatunde Olatidoye, Member Manager
b.Contact information for person listed in item la above:
Street Address:
City: State: Zip:
Mailing Address (if applicable):P.O. Box 3743
City:Wilmington State:NC Zip:28406
Phone: [phone] Fax: ( 1
Email:
c. Please check the appropriate box. The applicant listed above is:
❑ The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
® Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/ Organization: lohn W. Anaenost and Kathleen jewel
Signing Official & Title:Owners
b.Contact information for person listed in item 2a above:
Street Address:5 E. Fayetteville Street
City:Wrightsville Beach State:NC Zip:28480
Mailing Address (if applicable):
Phone: (910 ) 256-4421 Fax:
3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact
Signing Official &
b. Contact information for person listed in item 3a above:
Mailing Address:
Phone:
4. Local jurisdiction for building permits:
Point of
Fax:
Phone #:
JAN 0 3 2013
13 2012
0
Form SWU-101 Version 06Aug2012 Page 2 of 6 wv

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
Two Infiltration Trenches
2, a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUD Approval Date:
❑ Valid Building Permit Issued Date:
❑ Other: Date:
b.If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
❑ Coastal SW -1995 ❑ Ph II - Post Construction
3. Stormwater runoff from this project drains to the
4. Total Property Area: 2.08 acres
River basin.
5. Total Coastal Wetlands Area: 0 acres
6. Total Surface Water Area: 0 acres
7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project
Area+:2.08 acres
Total project area shall be calculated to exclude the following the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Nornal High Water (NHW) line or Mean High Water
(MHW) line, and coastal wetlands landward from the NHW (or MHW) line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 25.0 %
9. How many drainage areas does the project have?2 (For high densihj, count 1 for each proposed engineered
stonnwater BMP. For low densihj and other projects, use 1 for the whole properhj area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Basin'Inf6rniation r
Draina e Area 1'
'Draina "e Area 2
Drainage Area
Drainage Area _
Receiving Stream Name
W
ICW
ICWW
Stream Class *
SA; ORW
SA; ORW
Stream Index Number.
18-87-(25.5)
18-87-(25.5)
Total Drainage Area (so
20,780
16,770
On -site Drainage Area (sf)
20,780
16,770
OffsiteDrainage Area (so
0
0
Pro osed Impervious Area** (SO
11,525
10,775
Impervious Area** total
55.5
64.3
Im ervious ` Surface Area
Draina e Area 1
Draina e Area 2
Draina e Area _
Draina a Area _
On -site Buildings/Lots (so
5,600
5,600
On -site Streets (so
2,015
2,145
On -site Parking (so
2,430
1,490
On -site Sidewalks (so
520
580
t= A
Other on -site (so
120
120
OAK
Future (so
840
840
R
u [U J
Off -site (so
0
0
"
Existing BUA*** (so
0
0
Total (sf):
11,525
1),775
Stream Class and Index Number can be determined at: http://portaLucdenzr.or vebhoq/ps/csu/classifr'cations
'* Impervious area is defined as the built upon area including, but not lionted to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
** Report only that amount of existing BUA that will remain after development. Do not report am existing BUA that
is to be removed and which will be replaced by new B UA.
Form SWU-101 Version 06Aug2012 Page 3 of 6

11. How was the off -site impervious area listed above determined? Provide documentation. AutoCAD
Projects in Union County: Contact DWQ Central Office staff to check if the project is located within a Threatened &
Endangered Species watershed that may be subject to more stringent stormwater requirements as per 15A NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
fromhttp://portal.ncdenr.org/web/­wq/ws/su/bnip-manual.
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. A detailed application instruction sheet and BMP
checklists are available from http://portal.ncdenr.org/web/wq/ws/su/statesw/forms docs. The complete
application package should be submitted to the appropriate DWQ Office. (The appropriate office may be
found by locating project on the interactive online map at htttp://portalmcdennorg/web/wq/ws/su/maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from h_ttp://portalmcdennorg/web/wq/ws/su/statesw/forms dots.
I i 'als
1. Original and one copy of the Stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants
Form. (if required as per Part V11 below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to OYA
http://www.envhelp.org/pages/onestopexpress.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor agy
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the ow
receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the'/z
mile radius on the map.
7. Sealed, signed and dated calculations (one copy).
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale. ECEIV
g. Revision number and dates. IF— ■■ �9
h. Identify all surface waters on the plans by delineating the normal pool elevation of �Atr
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal 0 3 2013
waters, and any coastal wetlands landward of the MHW or NHW lines. A V
• Delineate the vegetated buffer landward from the normal pool elevation of impounded:_
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
1. Details of roads, drainage features, collection systems, and stormwater control measures.
m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who A,
made the determination on the plans. `AV
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculation�s7�
o. Drainage areas delineated (included in the main set of plans, not as a separate Ddocument). 3 �oi2
p. Vegetated buffers (where required). r. EC
Fonn SWU-101 Version 06Aug2012 Page 4 of 6

,9: Copy of any applicable soils report with the associated SHWT elevations (Please identify
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"xll" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verifij the SHWI' prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: 1480 Page No: 1138
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC U-
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 21-1.1003(e).
The corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
htW://www.secretary.state.nc.us/CorDorations/CSearch.aspx
VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from
http://portal.ncdennorg/web/wg/ws/su/statesw/forms does. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, that the covenants will be binding on 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 NC DWQ and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer:Phillip G. Tripp, P.E.
Consulting Firm: Tripp Engineering, P.C.
Mailing Address:419 Chestnut Street
City: W ilmington
Phone: (910 ) 763-5100
Email: [e-mail]
State:NC Zip:28401
Fax: (910 ) 763-5631
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or hjpe name of person listed in Contact Infonnation, item 2a) folm W. Anagnost , certify that I
own the property identified in this permit application, and thus give permission to (print or hjpe none of person
listed in Contact hnfornmtion, item la) Babatunde Olatidove with (print or hjpe name of organization listed in
Contact Infonnation, item la) Cabo Ventures. LLC to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
EGEI V E
1AN 0 3 2013
8Y:
Form SWU-101 Version 06Aug2012 Page 5 of 6

,As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DWQ Stormwater permit reverts back to
me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a
completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment
facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid
permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including
the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
a kee I 'L f 10/ L
Signature: W M�M, Date:
Notary Public for the State of 1, )o- fk lAca li 4; County of
4 )e..) �"04e " , do hereby certify that Jok,. LJ • AAo rosf- personally appeared
before me this J�Tday of 1)e C .20f-2 , and acknowledge the due execution for
a stormwater permit. Witness my hand and official seal,
JQyN P. a -W*
NOTARy�y
PUBLIC
X. APPLICANT'S CERTIFICATION
SEAL
My commission expires 1 I j., 3 0 t%
I, (print or type name of person listed in Contact Information, item la) Babatunde Olatidoye
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of the
applicable stormwater ru�' ° °-AC,21-1 .1000 and any other applicable state stormwater requirements.
Date: 1fA-2- /2
1, 1,)P In C. (�Lq irfj a Notary Public for the State of Nod h Canb/ IQ —County of
-PcMer do hereby certify that .iYIIXtE )(H-e nlodi6l Rpersonally appeared
before me this L day of 'iJoXf"601- 2- , and acknowledge the due execution of the application for
a stormwater permit. Witness my hand and official seal, l�((�a�� x
C'..eq�9
Acc2..PUBLAG:
�'• .........
FR COUNT
SEAL r=CF-1 W
JAN 0 3 2013
My commission expires AI - BY:
{,S-l(v
Form SWU-101 Version 06Aug2012 Page 6 of 6
�� pyyu
DEC 3 2012
13Y:.

General Data: Impervious, Drainage Area and Volume
PROJECT NUMBER: 5W8
1130103
Reviewer:
K. Johnson
DRAINAGE BASIN:
Cape Fear
Current Date
22-Feb-13
Original Run Date:
17-Jan-13
DA Number
1
2
3
4
5
6
7
8
9
10
BMP Type
Infll Trench
Infll Trench
No BMP In
DA
No BMP in
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
Receiving Stream
icwW
icwW
Stream Index
18a7g2551
18A7{255)
Class
Impervious Area
Proposed Impervious ALL IMPERVIOUS Total ft2:
SA; ORW
11,525
SA; ORW
10,775
0
0
0
0
0
0
0
0
Onsite Buildings
5.600
5.600
Onsite Streets
2,015
2,145
Onsite Parking
2.430
1 490
Onsite Sidewalks
520
580
Onsite Other
120
120
Future
840
840
Offsite
0
0
Existing
0
0
50eviou'�" shP �mijr rvi Id'R e12
0
0
0
0
0
0
0
0
0
0
Onsite Buildin s
Onsite Streets
Onsite Parkin
Onsite Sidewalks
Onsite Other
Future
Offsite
Exlshn
P,ro sed m eivwus SubectBo 008/P.hli Rule t}.
11,525
10,775
0
0
0
0
0
0
0
0
Drainage Area
Drainage AreaTotal ft2:
20,780
20,780
Onsite ft2
20,7801
16,770
Offsite ft2:
0
0
-P`""`'=P"'rinitteADraina-e'Ai-ea+ ld" 1's--
0
0
0
0
0
0
0
0
0
0
Onsite ft
Offsite ft2:
Proposed DA (Being Added By Mod), R2:
20,780
20,780
Drain a Area Subject to Old Rule fe,
0
0
0
0
0
0
0
0
0
0
Dminatie Area Subject to New Rule ft2:
20,780
20,780
Percent Impervious Overall, per DA:
Volume Required
Volume Re uired Old Rule ft':
55.46%
51.85%
Old Rule:
Design Storm Old Rule in:
Volume Required, New Rule ft':
3,285
3,071
RVP,.0..i.a,,.m, New Rule:
0.05
005
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
Rvp. O.,.aP,,,.,,i, New Rule:
0.55
0.52
Design Storm, s., in:
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1 5
Design Storm„obi,,, in:
3.801
3.80
Subject to SA? Y oN
Volume Requiredr
1,4261
2
Volume Reguired,r24n., ft :
3,285
3,071
Volume Required, Total Old +New Rule ft':
3,2851
3,071

46
Infiltration Trenches
PROJECT NUMBER: SW8
130103
Reviewer:
K. Johnson
DRAINAGE BASIN:
Cape Fear
Current Date
22-Feb-13
Original Run Date:
17-Jan-13
DA Number
1
2
3
4
6
6
7
8
9
10
BMP Type
Infll Trench
Infll Trench
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
Solis Report Data
Bottom of the Infil Trench Elevation, Reported, fmsl:
3.75
4.00
SHWT Elevation, Reported, fmsl
1.75
200
Depth to SHWT, calculated from reported, ft.
2.0
2.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Depth to SHVJT per Soils Report, in:
42.00
4200
Ground Elevation at Boring in Soils Report, firri
5.25
550
Depth to SHWT per Soils Report, in:
42.001
42001
000
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Depth to SHWT per Soils Report, ft:
3.50
350
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Resulting SHWT per Soils Report, firri
1.75
200
000
0.00
0.00
0.00
0.00
0.00
000
0.00
Infiltration Rate, Reported, inlhr:
7.70
350
Infiltration Trench Dimensions and Drawdown
Height Of Trench, ft:
2.27
227
Area, Bottom of trench, :
2,635
1,677
Invert (Bottom) Elevation, ft:
3.8
4.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
00
StoragefOverflow Elevation, ft:
6.02
6.27
Top Elevabon, ft:
6.021
6.27
Voids Volume, ft':
0.95
0.95
Volume Provided in Trench, It:
5,682
3,616
Volume Provided in Trench, Reported, ft':
5,682
3,616
Volume Required, fl
3,285
3,071
Infiltration Rate, Reported, iri
7.70
3.50
0.00
0.00
0.00
000
0.00
0.00
0.00
0.00
Volume to Drawdown, fl :
3,285
3,071
Time to Drawdown, hr
1.9
6.3
Time to Drawdown, Reported, day.
Time to Drawdown, day:
0.081
0.26
Design Options M1, 2, & 3:
Volume Required for Option, fl :
0
0
Enter Design Volume Multiplier
'2.0'forOptions 1 or 2, "2.5"forOption 3
Time Drawdown Vol. Req. for Option at 112 rate, hr.
0
0
Time Drawdown Vol. Req. for Option at 112 rate, day
0.00
0.00
Time Drawdown Vol. Req. for Option at 112 rate, day:
Reported
Storage Met at Elevation, fmsl:
Top Elevation (or Emergency Overflow Elev), fmsl
Is the Top Elev. higher than the Storage Met Elev.9
Design Option 94:
Runoff depth for 10 yr 24 hr storm, inches
7.00
7.00
Time to Drawdown 10yr volume, day:
0.33
1.07
Time to Drawdown 10yr volume, hr:
7.87
25.61
RVPmi D.,.I, ,Overall:
0.55
0.52
Volume of 10 yr. 24 hr storm, fl
6,657
6,263
Volume infiltrated in 24 hours, ft:
20,290
5,870
0
0
0
0
01
01
0
0
Remaining volume to store, fl :
-13,633
393
IS the volume Snored >=Min Vol (I 5'or ly241hrpriwNsg9
Y
Y
Is Volume Provided >= Remain Vol. to Store?
Y
Y

' DIVISION OF WATER QUALITY -I R
INFILTRATION SYSTEM INVESTIGATION
Complete and email this form to Vincent [e-mail], If there are more than 7 areas to be tested,
attach a second sheet.
State Soil Scientist Confirmation Visit date/time:
Project Name: Serenitv Point County: New Hanover
Street Address: 4616 Serenity Point
Directions from the nearest intersection of two major roads:
At the end of N. Channel Haven Drive
>1 acre being disturbed? DYES ®NO CAMA Major required? [-]YES ®NO
Consultant Name: Lee Galloway, P.E. Phone: [phone]
Consultant Firm Name: Tripp Engineering
Bore Number
1
2
3
4
5
a Existing Ground Elevation
N/A
5.25
5.5
b Proposed Bottom Elevation
N/A
3.75
4.0
c Difference a minus b
N/A
1.5
1.5
d Add 2 ft. Min. Bore Depth
N/A
3.5
3.5
e Hardpan Depth?
N/A
N/A
N/A
Approx. Elev. Of SHWT
N/A
N/A
2.0
Max. lowest bottom elev.
N/A
3.75
4.0
h Infiltration Rate OK?
i Confirmation of SHWT
ror projects requiring more than 5 hand borings, manpower or equipment to
conduct the excavation must be provided by the consultant.
*State Soil Scientist Use ONLY
Comments
Required Attachments:
1. Legible vicinity map.
2. Complete Soils Report.
3. PDF formatted site plan with the boring locations to be tested. Site plans should
be emailed or hand -delivered only. Illegible faxed maps will not be accepted.
All proposed infiltration areas and existing, active utility lines located within the proposed
basin trench 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 pavement and there is no open area nearby, equipment capable of
breaking through the impervious 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 IE
verify the soil conditions that are reported in the Soils Report, and make a determinatidnTasFto'_��
the suitability of the site to meet the infiltration design requirements under NCAC 2�10rrand
assumes no liability should the system fail. f ra 2 2�i3
S:\WQS\STORMWATER\FORMS\infiltration site visit Revised

12 Ci?
October 16, 2012
Tripp Engineering. P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Attention: Mr. Phil Tripp, P.E.
Reference: Infiltration Testing and Seasonal High Watertable Estimates q�
Serenity Point E CEI �N/ E
Serenity Point at Channel Haven
Wilmington, North Carolina JAN 0 3 2013
RFTS Job No. 782-12 11
8Y.
Dear Mr. Tripp:
RFTS is pleased to provide testing services during the design phase of the residential
development located off Serenity Point in the Channel Haven development in Wilmington, North
Carolina. Specific site grading plans had not been provided to us at the time this report was
prepared.
DESCRIPTION OF ACTIVITIES AND FINDINGS
As requested, our staff visited the site on October 9, 2012, to perform infiltration testing and
estimate the seasonal high watertable at two locations identified by you. The purpose of this
testing was to provide soil parameters for stormwater infiltration design.
Seasonal High Watertable Estimate
Hand auger borings were advanced at two locations to a depth of approximately 5 feet below the
existing ground surface in areas proposed by the civil designer for infiltration structures. The
encountered soils were logged and visually classified by depth and a Munsell Soil Color Chart
was used to determine the hue. value, and chroma of the visually distinct soil layers. Our soil
logs are presented in Table 1.
INF-1
Soils encountered in our boring at this location consisted of interbedded relatively clean fine
sands with the exception of the soils in the upper 7 inches which were clayey sands and are likely
fill soils. No distinct zones of soil cementation were encountered in the profile. Based on our
experience with similar soils and comparisons of the soil coloration to the Munsell Chart, it is
Our opinion that the seasonal high water table occurs approximately 45 inches below the ground
surface. A measurement made I hour after angering indicate a depth to standing water in the
boreholes of 48 inches below the existing ground surface.
RPTS. PLLC Connnitted to Responsive Service Phone [phone]
Caro 3a Seach. Beach Fve N
Carolina ©each. Noah Carolina 23428 re¢t•ro.rfisn!/c,com FinaiP davidwmstead Bchaner net

Tripp Engineering, P.C.
RFTS Job No. 782-12
INF-2
October 16, 2012
Page Two
Soils encountered in our boring at this location consisted of interbedded relatively clean fine
sands with no distinct zones of soil cementation in the profile. Based on our experience with
similar soils and comparisons of the soil coloration to the Munsell Chart, it is our opinion the
seasonal high water table occurs approximately 45 inches below the ground surface. A
measurement made I hour after augering indicate a depth to standing water in the borcholes of'
50 inches below the existing ground surface.
Infiltration Testinu
Infiltration testing was performed using a model 2800 Guelph Permeameter which is a
constant -head device which operates on the Mariotte siphon principle and is referenced in ASTM
D-5126. The permeameter is used to determine field saturated hydraulic conductivity in
centimeters per second for soil at a specified depth. This testing involves advancing a borehole to
the desired infiltration depth and introducing water at a constant head to determine the steady
state flow rate from which the hydraulic conductivity can be calculated.
Our testing was performed at approximately 21 inches below the ground surface at both INF-I
and INF 2, and was approximately 27 inches above the seasonal high water estimate. The results
of our permeameter testing are presented in Table 2.
RECOMMENDATIONS
Based on the results of our field testing and soil classifications at the test location, we offer the
following recommendations for stormwater infiltration design:
At the test locations INF-1 and INF-2, it is our opinion that in order to achieve the steady state
flow rates obtained during our testing; the areas of infiltration galleries or other infiltration
structure should introduce stormwater at approximately 24 inches below the existing ground
surface elevation. For purposes of sizing the structure we recommend an ultimate application rate
of 13 and 7.7 inches per hour, respectively. These recommendations should be reviewed by
appropriate regulatory authorities before finalizing the details of any civil design.

'Tripp Engineering, P.C.
RFTS Job No. 782-12
CLOSURE
October 1, 2012
Page Three
Please find attached our field data and a sketch showing the approximate test locations. If you
have any questions after reviewing this letter, please do not hesitate to contact us at your
convenience.
Sincerely,
RFTS,PLLC
David L. Winstead Steven D. Ke 1} P.E.
Field Operations Manager Senior L'-ngince
NC Registration No. 17638
DLW:SDK/dlw
Attachments otap.e.ugty .
�Oc�St1 CAR �,ya
3E d1
17638A ��

Table I
Munsell Soil Classifications
Serenity Point
Wilminaton, North Carolina
RFTS Job No. 782-12
L.oc
Soil Description
Hue
Value
Chroma
Depth
(in.)
Comments
1NF-1
Topsoil
-
-
0-2
Brownish Yellow fine to medium
SAND with Clay
IOYR
6
6
2-7
Possible Fill
Soil
Very Dark Brown fine to medium
SAND with Shell fragments
IOYR
2
2
7-13
Dark Yellowish Brown fine
SAND
IOYR
3
4
13 ?0
Yellowish Brown fine SAND
IOYR
5
6
20-33
Light Yellowish Brown fine
SAND
IOYR
6
4
33-45
Moist
Light Brownish Gray fine SAND
IOYR
6
2
45-57
SIIWT@45"
/Hz0@48"
INF-2
Topsoil
-
-
0-8
Dark Yellowish Brown fine
SAND
IOYR
4
6
8-17
Pale Brown fine SAND
IOYR
6
3
17-34
Light Yellowish Brown fine
SAND
IOYR
6
4
34-40
Yellowish Brown fine SAND
IOYR
5
6
40-45
Moist
Dark Yellowish Brown fine
SAND
IOYR
4
6
45-58
SHWT@45"
/1 iz0@50"
Dark Yellowish Brown fine
SAND
IOYR
4
4
58-63
JAN 0 3 2013

Table 2
Guelph Permeameter Test Results
Serenity Point
Wilmington, North Carolina
RI-TS Job No. 782-12
(2) C
Location
INP-1
INF-2
Depth (in.)
21
21
Hi (cm)
5
5
Ri (cm/min)
6.4
12.7
Ris
(cm/sec)
0.106
0.212
H2 (cm)
10
10
R, (cm/min)
8.8
19.0
Res
(cm/sec)
0.146
0.317
Kr, (cm/sec)
9.22x10
5.45x10-
Kr, (in/hr)
1.3
7.7
Definition of Terms
R 2 — Established 3 or more constant rate of water level change (cm/min)
Ris, 2s — Calculated steady state flow rates (cm/sec)
Hi.2 — Maintained Head of I-I2O (cm)
Kr, — Calculated field saturated hydraulic conductivity (cm/sec)
(1),,, — Matric flux potential (cm/sec)
a — Alpha parameter
Depth — Depth of well hole (in.)
Location — Test location identification number
Note: Diameter of well is 3.0 cm.

I Soils Engineering and
Testing Services
_
y
I.I
' II
INP-1
INFILTRATION TESTING AND SHWT ESTIMATES
SERENITY POINT AT CHANNEL HAVEN
WILMINGTON, NORTH CAROLINA
JOB NO. 782-12
FIGURE 1
DRAWING NOT TO SCALE
DATE: 10/16/12
SKETCH: DLW
REVIEW: SDK
Legend
e APPROXIMATE TEST LOCATION
RFTS, PLLC
1305 3A Carolina Beach Ave N
Carolina Beach, North Carolina 28428
Office: 910-470-7450

1Zo33
RF S
T,
Soils Engineering and Testing Services
Tripp Engineering, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Attention: Mr. Lee Galloway
January 18, 2013
Reference: Additional Infiltration Testing
Serenity Point
Serenity Point at Channel Haven
Wilmington, North Carolina
RFTS Job No. 782-12
Dear Mr. Galloway:
*c.\It`h ��3
"I'll",
BY:
RFTS is pleased to continue to provide testing services during the design phase of the residential
development located off Serenity Point in the Channel Haven development in Wilmington, North
Carolina.
DESCRIPTION OF ACTIVITIES AND FINDINGS
As requested, our staff visited the site on January 16, 2013, to perform an additional infiltration
test at an alternate site of the initial location INF-l. The purpose of this testing was to provide
additional soil parameters for stormwater infiltration design.
Infiltration Testing
Infiltration testing was performed using a model 2800 Guelph Permeameter which is a
constant -head device which operates on the Mariotte siphon principle and is referenced in ASTM
D-5126. The permeameter is used to determine field saturated hydraulic conductivity in
centimeters per second for soil at a specified depth. This testing involves advancing a borehole to
the desired infiltration depth and introducing water at a constant head to determine the steady
state flow rate from which the hydraulic conductivity can be calculated.
Our testing was performed at approximately 21 inches below, the ground surface at location
INF-3, and was approximately 27 inches above the seasonal high water estimate at location
INF-1. The results of our permeameter testing are presented in Table 1.
At location INF-3, it is our opinion that in order to achieve the steady state flow rates obtained
during our testing; the area of infiltration gallery or other infiltration structure should introduce
stormwater at approximately 21 inches below the existing ground surface elevation. For purposes
of sizing the structure we recommend an ultimate application rate of 3.5 inches per hour. These
recommendations should be reviewed by appropriate regulatory authorities before finalizing the
details of any civil design.
13 a, raw Committed to Responsive Service Phone: [phone]
Caro na BeacCaroh, Beach Ave N Email davidwmstead®chartecnet
Carolina Beach, North Carolina 28428 ruw:v.rftsp(lc.com

Tripp Engineering, P.C.
RFTS Job No. 782-12
CLOSURE
January 18, 2013
Page Two
Please find attached our field data and a sketch showing the approximate test locations. If you
have any questions after reviewing this letter, please do not hesitate to contact us at your
convenience.
Sincerely,
RFTS,PLLC
David L. Winstead
Field Operations Manager
DLW:/dlw
Attachments

Table 1
Additional Guelph Permeameter Test Results
Serenity Point
Wilmington, North Carolina
RIFTS Job No. 782-12
Location
INF-3
Depth (in.)
21
H, (cm)
5
Ri (cm/min)
15.6
Ris (cm/sec)
0.26
H2 (cm)
10
R2 (cm/min)
21.6
Res (cm/sec)
0.36
Krs (cm/sec)
2.53x10
Kt, in/hr)
3.5
Definition of Terms
RI,2 — Established 3 or more constant rate of water level change (cm/min)
RIs, 2S — Calculated steady state flow rates (cm/sec)
HI,2 — Maintained Head of H2O (cm)
Krs — Calculated field saturated hydraulic conductivity (cm/sec) (in/hr)
Depth — Depth of well hole (in.)
Location — Test location identification number
Note: Diameter of well is 3.0 cm.

� i
VV Iil�:A x�,
M
Legend
9 APPROXIMATE TEST LOCATION
ADDITIONAL INFILTRATION TEST LOCATION FIGURE 1
DRAWING NOT TO SCALE RFTS, PLLC
SERENITY POINT AT CHANNEL HAVEN DATE: 1/18/13 1305 3A Carolina Beach Ave N
WILMINGTON, NORTH CAROLINA SKETCH: DLW Carolina Beach, North Carolina 28428
Soils Engineering and JOB NO. 782-12 office: 910-470-7450
Testing Services REVIEW:

DIVISION OF WATER QUALITY
INFILTRATION SYSTEM INVESTIGATION
Complete and email this form to [e-mail]. If there are more than 7 areas to be tested,
attach a second sheet.
State Soil Scientist Confirmation Visit date/time:
Project Name: Serenity Point Cou ty: New Hanover
Street Address: 4616 Serenity Point
Directions from the nearest intersection of two major roads:
At the end of N. Channel Haven Drive
>1 acre being disturbed? []YES ®NO CAMA Major required? [-]YES ®NO
Consultant Name: Lee Galloway, P.E. Phone: [phone]
Consultant Firm Name: Tripp Engineering
Bore Number
1
2
3
4
5
6.
7
a Existing Ground Elevation
5.25
5.5
b Proposed Bottom Elevation
3.75
4.0
?
,�, X `
c Difference a minus b
1.5
1.5
d Add 2 ft. Min. Bore Depth)
3.5
3.5
e Hardpan Depth?
N/A
N/A:
Approx. Elev. Of SHWT
1.75
2.0
Max. lowest bottom elev.
3.75
4.0
h Infiltration Rate OK?
i Confirmation of SHWT *
Z
For projects requiring more than 5 hand borings, manpower or equipment to
conduct the excavation must be provided by the consultant.
*State Soil Scientist Use ONLY
Comments 1 ajv xlum
Required Attachments:
1. Legible vicinity map.
2. Complete Soils Report.
3. PDF formatted site plan with the boring locations to be tested. Site plans should
be emailed or hand -delivered only. Illegible faxed maps will not be accepted.
All proposed infiltration areas and existing, active utility lines located within the proposed
basin/trench 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 pavement and there is no open area nearby, equipment capable of
breaking through the impervious 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 2H.1000, and
assumes no liability should the system fail.
S:\WQS\STORMWATER\FORMS\infiltration site visit Revised 3/08

Tan Lot No.
Verified by
zactse Tax $1
RECOk"o -%Frl YFRIFJED
51EBECrA F. -uc?,R
DEC Z8 12 25 PH '89
901or :'AGE
1480 1 136
Recommit Time, itoos anct ft,
Panel identifier No.
by County on the day of 19
Mail after recording to ,..Jahn W. Anagno.5.t. and wi f a,.. Ka tb I P en-Jewe I l-
3-41 b�.. . lA. z b ��,j
This instrument 1-9 Prepared by W, Allen.. robh, Sr —
Brief elfteription for the Indc,
36 NORTH CAROLINA GENERAL WARRANTY DEED
THIS DEED road. thiJ/+. day of _December 19 89
• by and between
GRANTOR GRANTEE
WALTER F. JOHNSTON and wife,
MARGARET S. JOHNSTON
JOHN W. ANAGNOST and wife,
KATHLEEN JEWELL
Enter 10 &PVTOtwtale Uses 1ey each partly: name east U lhussct.r at enut, s,, os,pal.wa ar w1sonshl,
The designation Grantor and Grantee as used herein shall include said parties, their heirs, successors• and assfRe, and
shall include singular, plural, masculine, feminine or neuter as required by content.I \ WITNESSETH, that the Grantor, for a valuable consideration paid by the Grants,. the receipt of which is' 44by
-cknowl.dgad, has and by these presents does grant, bargain, sell and convey unto the Grantee I. fee ain,51'e.'ai that
certain lot or parcel of land situated in the City of . , _.. , . .. . - I Y.I. :
- ..; bip New Hanover., County, North Carolina and more Particularly described as follows: --ow!"
ATTACHED DESCRIPTION
MARKED "EXHIBIT A'
F-IVF.
FEB 2 12013
BY:
RMAINEDITO 40J
172367 a6q- 10,

BOUg PAGE
1480 1139
Tha property beminabove described was acquired by Grantor by Instrument recorded In ......... .
...Book 1306, Page 640
A map showing the above described property is recorded in Plat Hook ... pass ....
TO HAVE AND TO HOLD the aforesaid lot or parcel of land and all privileges and appurtenances thereto belonging to
the Grantee in fee simple.
And the Grantor covenants with the Grantee. that Grantor in seized of the premises in fee simple, hall the right to convey
the same in fee simple. that title is marketable Rod free and clear of all encumbrances, and that Grantor will warrant and
defend the title against the lawful claim, of all persona whomsoever except for the exceptions hereinafter staled.
Title to the property hereinabove described is subject to the following exceptions:
p WITNESS wR[R[OI'. 0e e..nur ft.. ...vote 4t AN ems .ad sell. er 11 rerpmue e,. oavua {nl.
a«rN•4 •m< AT n. eaY .vnoekea om,I.e an. m .ee in s< e.reue4 .Hued A, m4.nV et 4. a fir • r •e rot Hert
rn set {e N .1(vM 4 R.
A. vOttm. - e44 u 4 d
------------------
._._ n ...__...(SGL1
WAL ER F. 0 STUN
AT,
....................__.__.r.41n.•t — MAItGARET B. 3OHNSTON
wrrear:
--- --------------------(lewLi
9
------------------- ---------Nom.r ampn..w Seel
m
w NORTH CAROLINA, ,--NeN HdnOV2L C... .
A I.. N.., Snell. at A. C..my ells "Al...4nYId. ,.mV u.: __ ___
�OTAq} 9°; -Walter F. Johnston and vif-- re Margat-Sc- Johnston onm mr.
,t a.N m p<.N•.nr mpeum Yetnrf me ON An, (end .,,A.tlee..... e..,.,.. el u ..A. wlm.n m>
Rand me Official .4mp n..Nv wOYN a. December
�$� t p..__._ r er ._...__._.............................
- Nwn [•,elk
S[AL-BTAMI NORTH CAROLINA_ _ ___________ C...V.
1. • Had., Annie Ot in. Ceu.Iy and St.W {le(mld, ee.tlf> at
petweJlY umf pebre mf IRA Say and .ernea,dr{d ta., _ Re 1.
u -- _ a N.,oi C."iAn .......tba, a•. [Rat RY a thimuY .uly
a[Iran and as me act et IN I., ... HAS. Y. fe4..... InH.ument fin dined 4 Ra nme by 14 ... .
Pnalden4 ...le. NO 14 [e.pe.LLe sal Add Atta4d RY . u 14 ........... a ................ emrmn.
w1Nua an, am. and eftlem ,amr e, 4a1. wa -------W At ....
ia_........
mymmmhalen fmbn: ....................................................................... Notw> rvRue
Tat ror..eoft . cmfaa I At _.___areas L. er, a ovary u c
.............................................................................
I. t<.tH4d 4 Ra tern L T4 '
14 S.[. A. ,{same,! a•d W4 terlflu4 are duly 4l4IerN el We da4 and I1mf and In tae Re.Y end Ia>< Yewv AS taf
REBECP. __ CRER ____ ___ _ _____ N__EW HANOVER -- - - _6[GIP>R 01 O[[Oa fOa- . _COUNTS
n •M •• .... .Oepet>rAulsluLLJf[4tee Of OnY
N.C. R.. we.ee term RS A ¢ nu. R...... fin.

BOO? A,F
1480 1140
E X H I B I T A
BEGINNING at an old concrete monument in the Northern line of
a dirt road (50 feet in width), said dirt road being created
by Indenture recorded in Book 424, Page 574 of the New Hanover
County Registry, said old concrete monument being located
South 50 degrees 12 minutes 30 seconds East 345.94 feet as
measured Eastwardly along the Northern line of the above mentior
ed dirt road from its point of intersection with the South-
eastern right of way line of a road having a width of 43.6 feet
said point of intersection also being the Southwest corner of
the John J. Malpass, Jr. tract as recorded in Book 1267, Page
1547 of the New Hanover County Registry; running thence, from
,said Beginning point, along the centerline of a ditch and the
Eastern most line of the above mentioned John J. Malpass, Jr,
tract North 38 degrees 07 minutes East 153.50 feet to an old
concrete monument in said ditch at its intersection with
another ditch, said concrete monument being in the Southern
line of the Charles E. Lewis tract as recorded in Book 439, Page
376 of the New Hanover County Registry; running thence, with
the Southern line of the above mentioned Charles E. Lewis tract
and with the centerline of said other ditch South 74 degrees
22 minutes East 176.03 feet to a brass shaft inside an old pipe
at the high water line of the Masonboro Sound; running thence,
with the high water line of the Masonboro Sound as it meanders
in a Southeastwardly direction to a point that is located South
50 degrees 21 minutes East 135.07 feet, North 40 degrees 53
minutes East 25.95 feet, South 65 degrees 02 minutes East
66.64 feet, South 59 degrees 30 minutes East 252.88 feet and
South 59 degrees 30 minutes East 29 feet more or less from the
point of Beginning; running thence, North 59 degrees 30 minutes
West 29 feet more or less to an old granite stone in the
Northern line of the Dudley Malpass tract as recorded in Book
1145, Page 58 of the New Hanover County Registry; running
thence, with the Northern line of the above mentioned Dudley
Malpass tract, the same course continued North 59 degrees
30 minutes West 252.88 feet to an iron pipe; thence, continuing
with the Northern line of the above mentioned Dudley Malpass
tract North 65 degrees 02 minutes West 66.64 feet to an old
pipe, said pipe being the Northwest corner of the above mention-
ed Dudley Malpass tract; running thence, with the Western line
of said Dudley Malpass tract South 40 degrees 53 minutes West
25. 95 feet to an old pipe in the Northern line of the above
mentioned dirt road created by Indenture recorded in Book 424,
Page 574 of the New Hanover County Registry; running thence
with the Northern line of said dirt road North 50 degrees 21
minutes West 135.07 feet to the point of Beginning, containing
2.1 acres more or less.
The above described tract of land being the same lands as
described in that certain Deed dated 30 June 1955 from D.D.
Cameron and wife, Elizabeth H. Cameron to Walter F. Johnston
and wife, Margaret S. Johnston and Francis E. Newton and
wife, Miriam J. Newton and recorded in Book 571 at Page 226
of the New Hanover County Registry. Also being the same propert,
described in that certain Deed from Miriam J. Newton to Walter
F. Johnston and wife, Margaret S. Johnston dated October, 1985
and recorded in Book 1306 at Page 640 of the New Hanover County
Registry.
TOGETHER WITH AND SUBJECT TO the rights and privileges of that
certain Deed of Easement and Agreement dated 1 February, 1988
and recorded in Book 1404 at Page 1069 of the New Hanover
County Registry.

BOOB PATE
1480 1139
Tha property herein>b.ve described w.a acquired by Grantor by instrument recorded In ..
book 1306, Page _640
......................
map ah.wing the above described property is recorded in Plat Book
.Pete . ..
TO HAVE AND TO HOLD the aforesaid lot or parcel of load and all privileges and appurtenances thereto belonging W
the Grantee in fee simple.
And the infee Grantor releasimple.
rah with the Grantee, that Grantor is seized of the premises in fee simple, has the right to convey
the .sins t fee simple, that title is marketable and free and clear of all encnmbionces, and that Grantor will warrant and
defend the title against the lawful claims of all persons whom..... except for the e.ceplion9 hereinafter slated.
Title to the property hereinaboye described is subject to the following earepti.m:
wrtxess wneaeor. m< .<,,,,,, nn<mm� .n m. n. a.ae
a<..� .. '°a. ar ..,.e w. < a.r a r•u mu
.bq..Nnee .rm<. n i n<u ". in n ...kaa m as
._..__._.._-------------
---- ---_ ..__ "
lCorponte N>m[I �
WAL ER F. O STON
ar G
j
__.___._._..._---- ..__.enf1e<"< KA ARET S. ZIOHNSTON
U
___ ___ ___________ - — _MsO
0
_.9e.renrY Ieerpen{e ae.11 W
N
...s. GRouxs,__New Hanover
MAW
9m<
�OT�} 9 Y _Walter _F: Johnston and wife, Mar aret Se Johnston___ onaur.
..n> .pp ne b.I< m. ran a .ennn.ua<e n 4
..nuuiw or an r..a"ms la•wm.a<. wwn. m>
. Sm.e..e una,tN.mp w.nz rni�+}_. e.r.r
f aa4aT.aM! NOiSN CAROCINA_ ------ _-----------
...__[eonay.
r.. xnnry l.bn< er u< fe....... .u4 ... r..ua. «.rap u.r
5 > rain, buo< m. mi. a.r me uaa.nuer<e u.. er a .--------- ----
..----- _----- . . nnnn u.mm. w.
n ne..ae .. u< .<. nr m, orv"<.. "., u b e is.,
er .nun.ur aniy
r� � m.nr.mr n.,rnm.m .n n<a ra m a.ma by i
u
m.um b> __.._. _-- --- u.._..._.._._.__,____.__ .....un.
W.—m> n.ae ..e om<�a .umv or .ea, uu _.....
arY <omml..lnn expire': _,___
n. rnre[nmr ferune. _______eI2b8 .___DCBC
u. rrmlm u a. wr.. t nu . main'., eras m..
_----_._.__..._._._------_. _ _.._.._,_._. _..-
we, n.rwr aruD<.0 ..r emy rrtuurm a wn a.0 eras um..na �n �nr Ewa eras a.r< m..a on w.
-
ECC 1 CRER , .__R¢CISi Ca O¢ pCEn. as NEW AANOVER
_. .CO.NTT
x.. e.1 e.w, r"rm N.. a lra.� s...... .n.

8010 1
1480 1140
E % H� A
BEGINNING at an old concrete a dirt road 450 monument in the Northern line of
feet in widthl, said dirt road being created
by Indenture recorded in Book 424, Page 574 of the New Hanover
County Registry, said old concrete monument being located
South 50 degrees 12 minutes 30 seconds East 345.94 feet as
measured Eastwardly along the Northern line of the above mention
ed dirt road from its point of intersection with the South-
eastern right of way line of a road having a width of 43.6 feet
said point of intersection also being the Southwest corne
1547 of the New Hanover County Registrr of
the John J. Malpass, Jr. tract as recorded in Book 1267, Page
y; running thence, from
said Beginning point, along the centerline of a ditch and the
Eastern most line of the above mentioned John J. Malpass, Jr,
tract North 38 degrees 07 minutes East 153.50 feet to an old
concrete monument in said ditch at its intersection with
another ditch, said concrete monument being in the Southern
line of the Charles E. Lewis tract as recorded in Book 439, Page
376 of the New Hanover County Registry; running thence, with
the Southern line of the above mentioned Charles E. Lewis tract
and with the centerline of said other ditch South 74 degrees
22 minutes East 176.03 feet to a brass shaft inside an old pipe
at the high water line of the shaft
Sound; running thence,
With the high Water line of the Masonboro Sound as it meanders
in a southdegrees
21 twa rd ly direction to a point that is located South
50 degrees 21 minutes East 135.07 feet, North 40 degrees 53
minutes East 25.95 feet, South 65 degrees 02 minutes East
66.64 feet, South 59 degrees 30 minutes East 252.88 feet South 59 degrees 30 minutes East 29 and
Point of Beginnin feet more or less from the
g; running thence, North 59 degrees 30 minutes
West 29 feet more or less to an old granite stone in the
Northern line of the Dudley Malpass tract as recorded in Book
1145, Page 58 of the New Hanover County Registry; cunning
thence, with the Northern line of the above mentioned Dudley
Malpass tract, the same course continued North 59 degrees
30 minutes West 252. 88 feet to an iron pipe; thence, continuing
With the Northern line of the above mentioned Dudley Malpass
tract North 65 degrees 02 minutes west 66.64 feet to an old
Pipe, said pipe being the Northwest corner of the above mention-
ed Dudley Malpass tract; running thence, with the Western li
. tract South 40 dne
of said Dudley Malpass egrees 53 minutes West
2595 feet to an old pipe in the Northern line of the above
mentioned dirt road created by Indenture recorded in Book 424,
Page 574 of the New Hanover County Registry; running thence
with the Northern line of said dirt road North 50 degrees 21
minutes West 135.07 feet to the point of Beginning, containing
2.1 acres more or less.
The above described tract of land being the same lands as
described in that certain Deed dated 30 June 1955 from D.D.
Cameron and wife, Elizabeth H. Cameron to Walter F. Johnston
and wife, Margaret S. Johnston and Francis E. Newton and
wife, Miriam J. Newton and recorded in Book 571 at Page 226
of the New Hanover County Registry. Also being the same proper[
described in that certain Deed from Miriam J. Newton to Walter
F. Johnston and wife, Margaret S. Johnston dated October, 1985
and recorded rn Book 1306 at Page 640 of the New Hanover County
Registry.
TOGETHER WITH AND SUBJECT TO the rights and privileges of that
certain Deed of Easement and Agreement dated 1 February, 1988
and recorded in Book 1404 at Page 1069 of the
County Registry. New Hanover

f
TRIPP ENGINEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] • FAX: [phone]
February 20, 2013
NCDENR
Division of Water Quality t1C tJ
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Kelly Johnson ECEOVE
Re: Serenity Point FEB 2 1 2013
Project No. SW8 130103
TE 12033 BY:
Dear Kelly:
In response to your correspondence, dated January 17, 2013, we offer the following:
1. Per our conversation on 2/20/13, the entire project is located within 575' of the ORW.
Therefore allocating the impervious area per drainage area is not applicable.
2. Per our conversation, the stone bed layer below the Ecorain Tanks is for structural
integrity of the system (not for stormwater storage). All stormwater storage volume is
located within the Ecorain Tanks. For clarification, a note was added to the "EcoRain
Tank Cross Section A -A" detail on Sheet C3 that reads "Stone base is required for
structural integrity of system." Therefore the bottom of both the infiltration systems
are 2' above the SHWT elevation.
3. Attached is a second soils report in the location of infiltration trench #2 (do not
disregard previously submitted soils report). Per the soils report, the infiltration rate
below trench 42 is 3.5 in/hr. Also note that the bore test in the location of infiltration
trench #2 has been changed to Bore Test #3 to match the soils report dated 1-18-13.
The infiltration rates for each bore location have been added to Sheet C1. The
"Infiltration System Investigation" report has been revised and is attached to reflect
the information for bore test 93. Below is the completed table per your comments.
Infil Trench Infil Trench
#1 #2
Soil Report Boring # Inside Footprint
Yes
Yes �3
Is this the same location V. Lewis tested?
Yes
Yes
Existing grade at boring's location
5.25
5.5
Depth to SHWT
42
42
3.5
3.5
Resulting SHWT Elevation
1.75
2.00
Soils' Report Infiltration Rate
7.7
3.5
msl
in
ft
msl
in/hr

4. The Supplement and the Filter Strip & Offline Bypass Waiver calculations have been
revised to reflect the 3.5 in/hr infiltration rate below Trench #2.
5. When the houses are constructed, the roof drains will be connected to the infiltration
trenches by the house builder. The roof drains can be connected at any point in the
infiltration system. The "Fabric Pipe Boot for Raintank" detail on Sheet C3 is intended
for the larger drainage pipes that will be connected during the site construction.
6. The existing road is already in place. No off -site work is proposed.
7. A 50' buffer has been added to Sheet CI that is offset from the Mean High Water
Line.
8. Drainage easements have been added and labeled on Sheet C1.
9. Bearings and distances have been added to the lot lines on Sheet C1.
10. The delineated wetlands have been added and labeled to Sheet C1.
11. New Hanover County requires an emergency overflow device for the infiltration
trenches. The control structure detains the 10-yr, 24-hour storm event. The control
structure is sized such that it will activate for storms greater than the I0-year even.
The proposed system exceeds NCDENR requirements.
12. A note has been added to Sheet C 1 that the proximity of the infiltration trench to the
proposed structures should not compromise the structural integrity of the building
foundation.
13. It is unlikely that the off -site well is for water supply because the adjacent lot has a
water service line provided by CFPUA.
14. Per our conversation on 2/20/13, the ER-301 & ER-501 refer to the Vertical Inspection
Port detail shown on Sheet C3. On Sheet C1, the number of EcoRain Tanks is noted
for each infiltration trench.
15. Attached is a copy of the deed.
Please review for approval and contact us with any questions, comments or if you need
additional information. Thank you.
Sincerely,
Tripp Engineering, P.C.
Lee Galloway, P. .
ALG:dcb
Enc.
EC EOVE
FEB 2 1 2013
l3v:

J-W80Ot03
Johnson, Kelly [ACV A-ltJ n%
From:
Lee Galloway [[e-mail]]
Sent:
Wednesday, February 13, 2013 8:45 AM
To:
Johnson, Kelly
Subject:
RE: Serenity Point Question
Yes. The stone base is required by the manufacturer. It helps with the stability/support of the raintanks and to decrease
washout/erosion around the raintanks when it begins to infiltrate into the ground. The detail shows that a filter fabric
will be wrapped around the raintanks (not the stone). Therefore all of the stormwater storage will be contained in the
raintanks, not in the stone.
I took the PE in October and found out that I passed in mid December. Thanks for the congrats! It feels great to get that
over with. Studying at home for 3 months (with kids) was no easy task. haha
Lee Galloway, P.E.
Tripp Engineering, P.C.
(p)910.763.5100
(f) 910.763.5631
lee -triage nQ@ec. rr.com
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.
From: Johnson, Kelly [mailto:kelly.p.johnson(c ncdenr.gov]
Sent: Wednesday, February 13, 2013 7:54 AM
To: Lee Galloway
Subject: RE: Serenity Point Question
Lee,
That is a new one for me. I haven't seen rocks for structure of infil systems. Is that required by the manufacturer? I
think that if it is just structural and if we can somehow document in the calcs that the rocks are for structure and aren't
part of the system used for storage/infiltration then I think that that would be OK.
Also, have you always been a PE or is that recent? (Maybe I just haven't noticed?) If it is recent, congratulations!
KJ
From: Lee Galloway [mailto:lee-trippenq(@ec.rr.com]
Sent: Tuesday, February 12, 2013 9:48 AM
To: Johnson, Kelly
Subject: Serenity Point Question
Kelly,
For Serenity Point (SW8 130103), 1 have a question regarding comment #2 (See your original comment below). The stone
bed layer beneath the raintank is not used for storm water storage. Only for structural integrity of the system.

This may not be of relevance to DENR, but with the City of Wilmington we have established that the stone layer of these
systems may encroach within the 2' limit of SHWT since they are not used for storage purposes. This helps due to the
fact that the SHWT is generally very shallow around here.
Serenity Point is one of these cases where we need all the clearance we can get. Is this something you can work with us
on?
Thanks.
2. Bottom Elevation of the Trench: The bottom elevation should be the bottom of the system. In this case, the
EcoRain Tank shows a stone bed underneath the tank. The bottom elevations are therefore 3.08msl (rather than
3.75ms1) for infiltration trench #1, and 3.33msl (rather than 4.Omsl) for infiltration trench #2. Please ensure that the
bottom of each tank has a 2ft separation from its respective SHWT elevation.
Lee Galloway, P.E.
Tripp Engineering, P.C.
419 Chestnut Steet
Wilmington, NC 28401
(p)910.763.5100
(f) 910.763.5631
[e-mail]
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.

A&IM
MC®ENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
January 17, 2013
Dr. Babatunde Olatidoye, Member
Coba Ventures, LLC
PO Box 3743
Wilmington, NC 28406
Division of Water Quality
Charles Wakild, P. E.
Director
Subject: Request for Additional Information
Stormwater Project No. SW8130103
Serenity Point
New Hanover County
Dear Dr. Olatidoye:
John E. Skvarla, III
Secretary
The Wilmington Regional Office received and accepted a State Stormwater Management Permit Application for
Serenity Point on January 3, 2013. A preliminary in-depth review of that information has determined that the
application is not complete. The following information is needed to continue the stormwater review:
,-I' ORW AEC: It appears that the entire project will be located within 575ft of the ORW AEC. If this is the case,
please note this on the plans. If not, please show the ORW AEC line on the plans and delineate the amount of
project area and allocated impervious both inside and outside the ORW AEC. Please also allocate the
impervious area per drainage area.
14'� Bottom Elevation of the Trench: The bottom elevation should be the bottom of the system. In this case, the
EcoRain Tank shows a stone bed underneath the tank. The bottom elevations are therefore 3.08msl (rather
than 3.75msl) for infiltration trench #1, and 3.33msl (rather than 4.Omsl) for infiltration trench #2. Please ensure
that the bottom of each tank has a 2ft separation from its respective SHWT elevation.
`J� Soils Report: Four boring locations are shown on the proposed plans, but only two borings are listed in the soils
report. INF-2 is likely in the footprint of infiltration trench #1. INF-1 on the soils report does not appear to be
inside the footprint of infiltration trench #2. Please submit soils data from inside the footprint of each BMP if you
have not done so already. Please also show the boring locations on the plans, and clarify the following data for
each infiltration trench.
Infil Trench Infil Trench
#1 #2
Soil Report Boring # Inside Footprint
Is this the same location V. Lewis tested?
Existing grade at boring's location
Depth to SHWT
Resulting SHWT Elevation
1.75
2.00
Soils' Report Infiltration Rate
msl
in
ft
msl
in/hr
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location. 512 N Salisbury St. Raleigh, North Carolina 27604 Onet 1'
Phone, 919-807-63001 FAX, 919 807-64921 DENR Assistance' 1-877-623-6748 No U]Carohna
Internet w ncwateroualitvom
JVaturallrl

ClaAdoye
January 17, 2013
Page 2 of 3
4. jnfiltration Rate: Table 2 shows that the infiltration rate for INF-1 (trench #2) is 1.3in/hr. The reported value in
/the supplement and in the 10yr24hr drawdown calculations are 2.75in/hr. Please make any necessary
corrections.
5.\_ReaDrainage: The plans show that the roof drainage will be directed to the infiltration trenches. It appears that
the downspout will attach to the EcoRain Tank with an 8" CPP connector. Please clarify how this connector
attaches to the tank. Is this through the "fabric pipe boot for raintank" shown in the detail? Can this occur at any
spot on the tank? How will the contractor know where to connect the roof drains when the houses are being built
(after the system has been installed and buried)?
6. L3 enity Road: Is the road to the development being built to serve the development or is it in place? If
impervious area is being built for the purpose of developing this project then it must be included in the
impervious area calculation.
7. \-8Ver: Please show the 50ft vegetated buffer on the plans. Please ensure that the plans do not show
development in this area. %
$� Drainage Easements: Please provide drainage easements and show their locations and dimensions on the /
plans.
\9!Lot Lines: Please provide lot lines with bearings and distances on the plans.
\- 6'Wetlands: Please either delineate wetlands on the plans or include a note that none exist onsite.
NU!t;ontrol Structure: The control structures do not appear to be parts of collection systems directing water to the
trenches. The bypass requirement is waived since the 10yr24hr storm is being infiltrated at half the reported
rate. What is the function of this structure? Is this structure intended to discharge water that flows through the
system? If so, please clarify how this will comply with the no -discharge requirement to SA waters, SL2008-211,
Section 2(b),(1)(c). C)\�_, W Cw 11n 0.5
00�e 1
Q-�Trench Proximity to Structures: Trenches are not typically permitted this close to structures because of the risk
to structural stability (see page 16-2 of the manual). Since the trenches are within 15ft of the homes please
provide a statement in the sealed calculations or on the sealed plans that the infiltration trenches will not
compromise the structural integrity of the proposed structures.
ell: Is the well shown a water supply well? If so, please ensure that the infiltration systems are at least 100ft
from the well per 15A NCAC 2H .1008(d)(2).
UA EcoRain Tank: If this is a chambered system, please provide the number of chambers used for each ER-301 1"
Drainage Cell and ER-501 EcoRain Tank for each trench. 0(1,
45-Deed: Please provide a copy of the deed showing that John Anagnost and Kathleen Jewel own the property.
Vi-�ata: Please review the data to ensure that it is consistent throughout. For instance, the supplement and plans
have differing values for the storage/overflow elevation. Please also revise any data that changes as a result of
this letter.

Olatrttoye
January 17, 2013
Page 3 of 3
Please remember that a change to one number may have a domino effect on other numbers. Please check all plans,
calculations and forms to ensure that the numbers are consistent throughout.
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 February 18, 2013, or the application will be returned as
incomplete. The return of a project will necessitate resubmission 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,
i
\ Ily Jhnso
Environ al Engineer
GDS/kpj: S:1WQS1Stormwater\Permits & Projects120131130103 HD12013 01 addinfo 130103
cc: Phillip G. Tripp, PE, Tripp Engineering, PC
Wilmington Regional Office Stormwater File

Co pleteness Review Checklist
Project Name: '—)eQ< k-(LA \ 0%&ff Received Date:�;)A( '2,
Project Location: TLor\ 0 (axn5toE Qtty) Accepted Date:
Rule(s) 02008 Coastal 1:11995 Coastal El Phase II (WiRO) Universal �1988 Coastal
Type of Permit New or Mod or PR Existing Permit # (Mod or PR): MPE Cert on File?
Density: &)_or LD Type: Commercial or Res e ial F-1NCG:
%: ____D(% 00) Stream Class: [:]SA Map [::]Offsite to SW8
Subdivided?: Sub visio or Single Lot JMORW Map FlExempt
Paperwork Emailed Engineer on:
FlSupplement(s) (1 original per BMP) BMP Type(s): e�,r.o,� TnQr<5 pn��G+
F1O&M with correct/original signatures (1 original per BMP except LS/VFS and swales) Y
Application with correct/original signatures
❑Corp or LLC: Sig. Auth. per SoS or letter Note to Reviewer:
M$505 (within 6mo)
cn ,2ii¢C�
Soils Report with SHWT h�5 ��4lIJ C(NEIZ �6-7-t
Calculations (signed/sealed) n � � 4fl'fj �� qA�6
1:1No obvious errors C�1 1
Density includes common areas, etc V
Deed Restrictions, if subdivided: �j
Signed & Notarized 2 y�
MCorrect Template (Comm/Res & HD/LD) or Dec. CovenantslKK&& Rest.
C"J
Plans
�2 Sets Details (roads, cul-de-sacs, curbs, sidewalks, BMPs, Buildings, etc)
Grading Wetlands: Delineated or No Wetlands
Vicinity Map Layout (proposed BUA dimensions)
Legend �DA Maps 11 Project Boundaries
Infiltration Wet Pond Offsite
Soils Report Soils Report MPE Cert for Master Lot #:
SHWT:SHWT: El Deed Rest for Master El Lot # Matches Master
Bottom: PP: BUA Permitted (Master): sf
Visited: BUA Proposed (Offsite): sf
Additional Information:
Permitted Proposed:
BUA (sf)
DA (sf)
PP (el)
SHWT (el)
Depth (ft)
Proposed:
Proposed:_
SA (sf)

Revised 1/2/13 TE 12033
Stormwater Drainage System & Erosion Control
Narrative
Serenity Point
4616 Serenity Point, Wilmington, NC
The Serenity Point project is a proposed residential development located at 4616 Serenity
Point in Wilmington, NC, New Hanover County, parcel ID # R07217-007-003-000.
Serenity Point is owned by Coba Ventures, LLC. The entire site is approximately 2.04
acres of land, of which 1.5 acres is proposed for disturbance. Serenity Point will be
serviced by CFPUA for public sewer and water. The site is adjacent to the Intracoastal
Waterway and includes CAMA setbacks as shown on the plan.
Coba Ventures, LLC is proposing four residential lots, gravel roadway, future sidewalks,
and two underground infiltration systems. New impervious area for this project is
estimated to be 22,645 sf. (0.52 acres). After project completion, the total amount of
impervious area for this site will be approximately 25.0% of the entire site. The
estimated amount of disturbed area is 1.5 acres.
The site will have two drainage areas. No off -site runoff flows onto the site and
therefore, none will be routed to the proposed BMP's. All outflow from the drainage
basins will drain to the Intracoastal Waterway; classification SA;ORW, Index No. 18-87-
(25.5), in the Cape Fear River Basin. All built up areas (BUAs) will be collected and
routed to the underground infiltration system BMP's.
The infiltration basins are designed to meet the State's 1.5" requirement and alternately
sized for the 1-yr, 10-yr, 25-yr, and 100-yr storm events. Calculations have also been
provided to demonstrate that the 10-yr 24-hour storm event can be infiltrated without
discharging the system using an infiltration rate of one-half of the infiltration rate
reported in the soils report, therefore waiving the State required off-line bypass and
vegetated filter strip. To evenly distribute discharge to the infiltration basin, separate drop
inlets are proposed around the perimeter of the basin. The maximum volume allowed per
inlet is 2.0 acre -inches (NCDENR BMP Manual section 16.3.3,2). The infiltration
system was designed to meet or exceed current State and County requirements and is
designed for high density projects. Outflow from the infiltration systems wiHp elTer g'4E
through proposed control structures that will discharge stormwater via o erl Jdd fl WAN , 2013
The SHGWT elevation is approximately 2' below the proposed bottom elvation ine
infiltration systems. ' a

TE 12033
Prior to clearing of the site, a construction entrance and temporary silt fence will be
installed. The removal of trees and vegetation will occur. The roadway and building
locations will then be graded. Underground utilities, including the stormwater drainage
system will be installed and inlet protection put into place. Temporary erosion control
measures will remain in -place until such time as when areas are stabilized. Permanent
measures include permanent stands of grass. Specific measures and directions to the
contractor are noted on the plans. Please refer to Sheet C2 for detail erosion control
measures and construction sequence.
Summary
For this project, all on -site drainage will be collected by a stormwater drainage system
and routed to two underground infiltration systems. The infiltration systems have been
sized to detain the pre/post development runoff for the 24-hour 1-yr, 2-yr, 10-yr. 25-yr.,
and 100-yr. storm events and to capture the first 1.5" of runoff from the new
development. Temporary erosion control measures include one gravel construction
entrance, silt fence, and seeding. Permanent erosion control measures include established
grass areas.

TRIPP ENGINEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] • FAX: [phone]
January 3, 2013
NCDENR
Division of Water Quality
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Kelly Johnson
Re: Serenity Point
TE 12033
Dear Kelly:
RMO JAN 0 8 ZOf3
In response to your correspondence, dated December 14, 2012, we offer the
following:
1. a. A site visit was conducted with Vince Lewis on 1/2/13. The site visit
investigation form was entailed to Vince Lewis upon completion of the site
visit.
b. The trenches will not be located in fill. They will be located in the existing soil
condition.
c. The elevation of the existing ground where Vince Lewis's bores were taken are
noted in the site visit investigation form that was submitted to Vince. Please
see your file for further detail.
d. Noted.
2. The overall maximum impervious percentage of the site has been reduced to
25.0%. See revised plans and calculations.
3. Attached to the resubmittal are the deed restrictions for each lot.
4. The "Property Boundary/Project Area" has been noted on the revised plans.
5. Attached to the resubmittal is the Drainage Area Map.
Please review for approval and contact us with any questions, comments or if you
need additional information. Thank you.
Sincerely,
Tripp Engineering, P C.
Lee Galloway JAN 0 3 2M
ALG:dcb
Enc. By:— — — — -- --

Revised. 1013
ALG
Serenity Point
CN and C Values
"`REfvuiE5
#14'At i
12033
PRE DEVELOPMENT
Determine Composite CN Value from TR-55 Table
2-2
-Soil Type Sand
Description HSG
CN
A(ac)
CNxA
Impervious A
98
0.00
000
Woods (Fair) A
36
086
3096
0 86
30 96
Composite CN Value =
36
Pre Development Composite Runoff Coefficient
Description
C
A (ac)
C x A
Impervious
095
000
0
Woodlands(2%-7%)
020
086
0172
0.86
0.172
Composite C Value =
Q.20
POST DEVELOPMENT- INFILTRATION TRENCH #1
Determine Composite CN Value from TR-55 Table 2-2 •Sml Type Sand
Description HSG
CN
A (ac)
CN x A
Impervious -
98
0.26
2548
Open Space (Good) A
39
0.22
8.58
Woods (Good) A
30
000
000
0 48
34.06
Composite CN Value =
71
Post Development Composite Runoff Coefficient
Description C
A (ac)
C x A
Impervious 095
026
0.25
Pastures, Grass (Sandy) 015
022
0.03
Woodlands(0%-2%) 0.10
000
0
048
028
Composite C Value = D.58
POST DEVELOPMENT -INFILTRATION TRENCH #2
Determine Composite CN Value from
TR-55 Table
2.2
'Soil Type Sand
Description HSG
CN
A (a0)
CN24x A
Impervious -
98
025
50
Open Space (Good) A
39
013
507
Woods (Good) A
30
000
000
0.38
29 57
Composite CN Value =
78
Post Development Composite Runoff Coefficient
Description
C
A (ac)
C A
Impervious
095
025
024
Pastures, Grass (Sandy)
0.15
013
0.02
Woodlands(0%-2%)
010
000
0
038
0257
Composite C Value =
0.68
Total Drainage Area
s , it
acres
20,780
048
Post Development Impervious Area
Land Use
sq. ft.
acres
Proposed Building
5.600
013
Gravel Road
2,015
0.05
Concrete Drivewa IUtitit Pad)
2,550
0 06
Future Sidewalk
520
0.01
Future Im ervious
840
0.02
Total
11,525
026
% impervious = 0555
= 555%
Total Drainage Area
sq M 1 acres
6.770 1 038
Post Development Impervious Area
Land Use
s . 0.
acres
Pro sed Building5.600
0.13
Gravel Road
2.145
0.05
Concrete (Driveway/Utility Pad
1,610
004
Future Sidewalk
580
0 01
Future Impervious
840
0.02
Total
10,77.5
0.25
\\\\,,,' 1 111,/
�•\ Q��N CA •,ROB
O;..........
'FESS/6 /.y
r\SEALI
% impervious = 0 643
= 64.3%
rim
JAN 03 2013
G VO6S72012\t 203&Serenitylcalcs112033-CN 8 C Value Calcs 1-2-13

Revised 1/2/13 Serenity Point
ALG Infiltration Trench #1
Simple Method - Volume Required / Provided Calculations
OPTION #1:
Storage Volume - SA Waters -1.5" Runoff
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area) Total Drainage Area
sq. h. acres
where 1 20,780 1 0.48
Rv= 0 05+0 009(1r)
Rv = Runoff Coef cent = storm runoff (inches) / storm rainfall (inches)
la = Impervious Fraction = Impervious portion of the drainage area (aces) / Drainage area (acres)
1A= 555 %
Rv= 055
Design Rainfall Depth = 1.50 in.
Drainage Area = OAR acres
Volume Required 1,426 Ra
OPTION #2'
Storage Volume - SA Waters - Pre -Development Runoff
1 -Year, 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv = 0 05-0.009(ta)
Rv = Runoff Coefficient = storm runoff (Inches) / storm rainfall (inches)
IA = Impervious Fraction = Impervious portion of the drainage area (acres) / Drainage area (aces)
Pre-Dev. Impervious Area=
0 Ra
Pre-Dev. Drainage Area =
20.780 ff2
'Am
000 %
Rv=
0050
Design Rainfall Depth = 3.88 in.
Drainage Area = 048 aces
Volume = 336 Ra
Storage Volume - SA Waters - Post -Development Runoff
1 - Year. 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv= 0.05,0.009((J
Rv = Runoff Coeffictenl = storm runoff (inches) / storm minfall (inches)
IA = Impervious Fraction = Impervous portion of the drainage area (acres) / Drainage area (aces)
Post-Dev. Impervious Area 11,525 f'
Post-Dev. Drainage Area 20,780 112
Ia= 55.5 %
Rv= 0.549
Design Rainfall Depth = 388 in
Drainage Area= 0.48 acres
Volume = 3.690 fls
DIFFERENCE IN VOLUME BETWEEN PREIPOST (1YR, 24 HR) = 3,354 fl'
Volume Provided (Raintank Infiltration System
Surface Area of Trendy = 2.635 R2
Depth of Trench = 2.27 #
Void Space = 0.95 (for Ramtanks)
VOLUME PROVIDED= 5,682 h' Vprovlded> Vrequired OK
Post Development Impervious Area
Land Use
sq. ft.
acres
Proposed Building
5,600
0.13
Gravel Road
2,015
0.05
Concrete (DdvewaytUtilily Pad)
2,550
0.06
Future Sidewalk
520
0.01
Future Impervious
840
0.02
Total
11,525
026
%impervious = 0.555
1#: 12033
G VuMX2012U203a-5aenmkaln\1rtnm e1\12030 mnvTnn Lenm.r Slware vdume o101 smm 1.2-13

Revised: 1/2/13
ALG
Serenity Point
Infiltration Trench #1
Filter Strip & Offline Bypass Waiver
(Half Infiltration Rate)
'NOTE: Calculations provided below are for the Vegetated
Filter Strip & Offline Bypass Waiver per NCDENR BMP
Manual Section 16.3.9(4). Option #4.
Design Option #4:
Infiltration Rate, Reported, in/hr:
7.70
Area, Bottom of trench, ft :
2,635
Volume Required, Total, ft :
3,354
Volume Provided in Trench, ft :
5,682
Runoff depth for 10 yr 24 hr storm, inches
7.00
Time to Drawdown 10yr volume, day:
0.33
Time to Drawdown 1oyr volume, hr:
7.87
Proposed Impervious, Total, ft2:
11,525
Drainage Area, Total , ft2:
20,780
RVpost Development, Overall:
0.55
Volume of 10 yr. 24 hr storm, ft :
6,657
Volume infiltrated in 24 hours, ft :
20,290
Remaining volume to store, ft :
-13,633
Is the Volume Stored >= Min. Vol. (1.5' or 1 y24hr pre"st)?
Y
Is Volume Provided >= Remain Vol. to Store?
Y
J#: 12033
G:\1085\2012\12033-Serenity\calcs\Trench #1\32033 - Filter Strip & Bypass Waiver Option #4 Trench 1 1-2-13

Revsed: 1/2/13 Serenity Point
ALG Infiltration Trench #2
Simple Method - Volume Required / Provided Calculations
OPTION #1
Storage Volume - SA Waters -1.5" Runoff
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Dram urge Area) Total Drainage Area
sq. If acres
where 16,770 0.38
Rv= 0,05-0009(1a
Rv = Runoff Coefficient = storm runoff (inches) / storm rainfall (Inches)
IA = Impervious Fractimn = Impervious portion of the drainage area (acres) / Drainage area (acres)
la= 643 %
Rv= 0.63
Design Ramfatl Dept = 1.50 in.
Drainage Area = 038 acres
Volume Required = 1,317 W
OPTION #2:
Storage Volume - SA Waters - Pre -Development Runoff
1 - Year, 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design RainiaY Depth) (Rv) (Dranage Area)
where
Rv = 0 05+0.009(I,J
Rv = Runoff CoeffrAanl = storm mnod (inches) / storm rainfall (inches)
IA = Impervious Fraction = Impetuous potion of the drainage area (aues) / Drainage area (acres)
Pre-Dev. Impervious Area = 0 11`
Pre-Dev. Drainage Area 16,770 ffg
Iq 000 %
Rv= 0050
Design Rainfall Dept = 388 in.
Drainage Area = 038 aues
Volume= 271 R2
Storage Volume -SA Waters - Post.Development Runoff
1 - Year. 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv= 0.05-0009(1r)
Rv = Runoff Coefficient = storm runoff (inches) / storm rainfall (inches)
la = Impervious Fraction = Impervious ponwn of the drainage area farces) / Drainage area (acres)
Post-Dev. Impervious Area 10.775 fie
Post-Dev. Drainage Area 16.770 ffg
(s= 64.3 %
Rv= 0628
Design Rainfall Depth = 388 In
Drainage Area 0.38 acres
Volume = 3,407 ff3
DIFFERENCE IN VOLUME BETWEEN PRE/POST (1 YR, 24 RR) = 3,136 ft,
Volume Provided (Raintank Infiltration System)
Surface Area of Trench = 1,677 /t2
Dept of Trench = 2.3 it
Void Space = 095 (for Ralntanks)
VOLUME PROVIDED= 3,616 g' I Vprovid ed>Vrequired Ok
Post Development Impervious Area
Land Use
sq. ft.
acres
Proposed Building
5,600
1 0.13
Gravel Road
2,145
0.05
Conaete(Oriveway/Utihly Pad)
1,610
0.04
Future Sidewalk
580
0.01
Future Impervious
940
0.02
Total
10,775
0.25
%Impervious = 0 643
= 64.3%
Jk: 12033
0 V0.\2012\12033 .2\130=Oln61n. Wn menu r2 Sto,ege Volume Cale:, S.,61-2-13

Revised: 2/19/13 Serenity Point J#: 12033
ALG Infiltration Trench #2
Filter Strip & Offline Bypass Waiver
(Half Infiltration Rate)
*NOTE: Calculations provided below are for the Vegetated
Filter Strip & Offline Bypass Waiver per NCDENR BMP
Manual Section 16.3.9(4). Option #4.
Design Option #4:
Infiltration Rate, Reported, in/hr:
3.50
Area, Bottom of trench, .
'1,677
Volume Required, Total, ft :
3,136
Volume Provided in Trench, ft :
3,616
Runoff depth for 10 yr 24 hr storm, inches
7.00
Time to Drawdown 10yr volume, day:
1.05
Time to Drawdown 10yr volume, hr:
25.13
Proposed Impervious, Total, ftZ:
10,775
Drainage Area, Total , ftZ:
16,770
Rvpost Development, Overall:
0.63
Volume of 10 yr. 24 hr storm, ft :
6,146
Volume infiltrated in 24 hours, ft :
5,870
Remaining volume to store, ft :
277
Is the Volume Stored >= Min. Vol. (1.5"or ly24hr pre/post)?
Y
Is Volume Provided >= Remain Vol. to Store?
Y
N, .CA �0 �'i�.
2� 2
y
SEAL Ive
n17374
ininii�°• 2 Iq 13
j-CFOVE
FEB 2 1 2013
G:\10BS\2012\12033-Serenity\calcs\Trench #2\12030 - Filter Strip & Bypass Waiver Option #4 Trench #2 2-19-13

t
Revised: 1/2/13 Serenity Point J#: 12033
ALG Infiltration Trench #2
Filter Strip & Offline Bypass Waiver
(Half Infiltration Rate)
'NOTE: Calculations provided below are for the Vegetated
Filter Strip & Offline Bypass Waiver per NCDENR BMP
Manual Section 16.3.9(4). Option #4.
Design Option #4:
Infiltration Rate, Reported, Whir:
2.75
Area, Bottom of trench, ft :
1,677
Volume Required, Total, ft:
3 6
Volume Provided in Trench, ft :
616
Runoff depth for 10 yr 24 hr storm, inches
7.00
Time to Drawdown 10yr volume, day:
1.33
Time to Drawdown 10yr volume, hr:
31.98
Proposed Impervious, Total, ft2:
10,775
Drainage Area, Total , ft2:
16,770
Rvpost Development, Overall:
0.63
Volume of 10 yr. 24 hr storm, ft :
6,146
Volume infiltrated in 24 hours, ft :
4,612
Remaining volume to store, ft :
1,534
Is the Volume Stored >= Min. Vol. (1.5" r 1yr24hr pm"st)7
Y
Is Volume Provided >= Remo Vol. to Store?
Y
G:VOBS\2012\12033-Serenity\calcs\Trench #2\12030- Filter Strip & Bypass Waiver Option #4 Trench #21-2-13

Ali i AF
NC®ENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P. E.
Governor Director
December 14, 2012
Babatunde Olalidoye, member
Coba Ventures, LLC
PO Box 3743
Wilmington, NC 28406
Subject: APPLICATION RETURN
Serenity Point
New Hanover County
Dear Mr. Olatidoye:
Dee Freeman
Secretary
On December 13, 2012, the Division received an incomplete State Stormwater Management Application for the
project listed above. The application and check number 5026, in the amount of $505 are being returned because the
application package lacked the necessary elements to accept it for review. Please provide the following information
upon the next submittal of this application package:
1 Soils:
a. Please contact Vince Lewis for a site visit.
b. Please discuss the fact that the trenches will be in fill with Vince Lewis. That is prohibited by rule
unless he allows an exception.
c. Please provide the elevation of the existing grade where the borings were taken so that the
elevation of the SHWT can be determined from the depth to the SHWT measurement.
d. The boring for BMP #2 isn't inside the footprint. Please discuss this with Vince Lewis.
2. ORW: Projects within 575ft of ORW have a maximum 25% imperviousness.
3. Deed Restrictions: Please provide deed restrictions.
4. Project Area: Please show the project area on the map.
5. Drainage Area Maps: Please provide DA maps.
Please visit DWQ's website at http://h2o.enr.state.nc.us/su/bmp forms.htm to download the latest available forms.
Please provide the requested information and return the package to the address below. Note that the 90-day
statutory permit review time begins upon receipt of a complete application. If you have any questions, please do not
hesitate to call me at [phone] or email me at [e-mail].
Sincerely,
elly John n
Environmental Engineer
GDS/kpj: S:1WQS1StormwateAPermits & Projects\Application Returns1201212 Serenity Point
cc: Phil Tripp, PE
Wilmington Regional Office Stormwater File
Wilmington Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 One
Phone. [phone] FAX [phone] DENR Assistance. 1-877-623-6748 NorthCarolina
Internetvn+rv.nmaterquality org n j�Nn//I.
An Equal Opportunity l Affirmative Action Employer Na sli(`IU,/

;DWQUSEONLY -
Date Received
Fee Paid
Permit Number
Applicable Rules: ❑ Coastal SW -1995 ❑ Coastal SW
(select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters
❑ Other WQ M mt Plan:
- 2008 ❑ Ph II - Post Construction
❑ Universal Stormwater Management Plan
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
1. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
2. Location of Project (street address):
4616 Serenitv Point
City:Wilmington County:New Hanover Zip:28412
3. Directions to project (from nearest major intersection):
From the intersection of Masonboro Loop I d (SR1492) And'd3itriel I 0 Dr (SR1620) travel east 250 If on
Channel Haven Dr. and turn left onto Channel Haven Dr N., travel 0.53 mile to Serenity Point Turn left onto
Serenity Point. Site is at the end of the road.
4. Latitude:34° 09' 04" N Longitude:77° 51' 35" W of the main entrance to the project.
II. PERMIT INFORMATION
1. a. Specify whether project is (check one): ®New ❑Modification ❑ Renewal w/ Modificationt
tRenewals with nmdifications also requires SWU-102 - Renewal Application Form
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number , its issue date (if known) , and the status of
construction: []Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification
2. Specify the type of project (check one):
❑Low Density ❑High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from DWQ
requesting a state stormwater management permit application, list the stormwater project number, if
assigned, and the previous name of the project, if different than currently
proposed,
4. a. 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):
❑LAMA Major ❑Sedimentation/Erosion Control: ac of Disturbed Area
❑NPDES Industrial Stormwater 0404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:
5. Is the project located within 5 miles of a public airport? ❑No ❑Yes
If yes, see S.L. 2012-200, Part VI: http:lZportal.ticdenr.ore/web/wci/ws/`lu/`Mtesw`/r—ule's%loa7�n
DEC 13 2012
Form SWU-101 Version 06Au92012 Page 1 of Ry:-------

III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the proiect):
Applicant/Organization:Coba Ventures, LLC
Signing Official & Title:Babatunde Olatidoye, Member Manager
b.Contact information for person listed in item la above:
Street Address:
City State: Zip:
Mailing Address (if applicable):P.O. Box 3743
City:Wilmington State:NC Zip:28406
Phone: (910 ) 2644858 Fax:
c. Please check the appropriate box. The applicant listed above is:
❑ The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
® Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization: John W. Anaenost and Kathleen Jewel
Signing Official & Title:Owners
b.Contact information for person listed in item 2a above:
Street Address:5 E. Fayetteville Street
City:Wrightsville Beach State:NC Zip:28480
Mailing Address (if applicable):
City: State: Zip:
Phone: (910 ) 256-4421 Fax:
3. a. (Optional) Print the name and title of another contact such as the projects construction supervisor or other
person who can answer questions about the project:
Other Contact
Signing Official &
b.Contact information for person listed in item 3a above:
Mailing Address:
Phone: ( ) Fax:
4. Local jurisdiction for building permits:
Point of Contact:
Phone #:
Form SWU-101 Version 06Aug2012 Page 2 of

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwa ter runoff will be treated.
Two Infiltration Trenches
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUD Approval Date:
❑ Valid Building Permit Issued Date:
❑ Other: _ Date:
b.If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
❑ Coastal SW -1995 ❑ Ph II - Post Construction
3. Stormwater runoff from this project drains to the Cape Fear River basin.
4. Total Property Area: 2.08 acres
5. Total Coastal Wetlands Area: 0 acres
6. Total Surface Water Area: 0 acres
7. Total Property Area (4) -Total Coastal Wetlands Area (5) -Total Surface Water Area (6) = Total Project
Area+:2.08 acres
Total project area shall be calculated to exclude the following the normal pool of inn ounded structures, the area
between the banks of streams and rivers, the area below the Nornal Hi In Water (NM line or Mean High Water
(MHW) line, and coastal wetlands landward from the NHW (orW hne. The resultant project area is used to
calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 =
9. How many drainage areas does the project have?2 (For high density, count I for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
xDraina —Wan 1'.
�'Drairia' e-Area 2'
Draina e Area :'
)Drains �e�Aiea-icy
Receiving Stream Name
ICWW
ICWW
Stream Class *
SA; ORW
SA; ORW
Stream Index Number *
18-87-(25.5)
18-87-(25.5)
Total Drainage Area (so
20,780
16,770
On -site Drainage Area (so
20,780
16,770
Off -site Drainage Area (so
0
0
Proposed Impervious Area** (so
11,685
10,935
% Impervious Area** total
56.2
65.2
I'M' eivious'?;S6rface'Area;: ;, . ;
.Drains 'e Area'1
'.Drainage Area 2
Drainage Area :'
Draiha e Area
On -site Buildings/Lots (so
5,600
5,600
On -site Streets (so
2,015
2,145
On -site Parking (so
2,430
1,490
On -site Sidewalks (so
520
580
Other on -site (so
120
120
Future (so
1,000
1,000
Off -site (so
0
0
Existing BUA*** (so
0
0
Total (so:
1 11,685
10,935
Stream Class and Index Number can be determined at: http://portal.nedenr.orQhoeMioalpslcsulclassificatiais
hnpermous area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Report only that amount of existing BUA that will remain after development. Do not report any existing BUA that
is to be removed and which will be replaced by new BUA.
Form SWU-101 Version 06Aug2012 Page 3 of6

11. How was the off -site impervious area listed above determined? Provide documentation. AutoCAD
Projects in Union County: Contact DWQ Central OJJ1ce staff to check if the project is located within a Threatened &
Endangered Species watershed that may be subject to more stringent stormwater requirements as per 15A NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
from http://portal.ncdenr.org/web/wq/ws/su/bmD-manual.
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. A detailed application instruction sheet and BMP
checklists are available from hUp: I Z portal.ncdenr.org/ web/ wq / ws/ so / sta tesw /forms does. The complete
application package should be submitted to the appropriate DWQ Office. (The appropriate office may be
found by locating project on the interactive online map at http://portal.ncdenr.org/ web/wq /ws/su /maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from http://portal.ncdenr.org/web/wq/ws/suZstatesw/forms does.
I i 'als
1. Original and one copy of the Stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to
http:/ /www.envhelp.org/pages/onestopexpress htmI for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the 1/2
mile radius on the map.
7. Sealed, signed and dated calculations (one copy).
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
1. Details of roads, drainage features, collection systems, and stormwater control measures.
m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations.
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
p. Vegetated buffers (where required).
Form SWU-101 Version 06Aug2012 Page 4 of 6

9. Copy of any applicable soils report with the associated SHWT elevations (Please identify
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"xll" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verifij the SHWT prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: 1480 Page No:1138 ad-10i
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC 01M—
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 2H.1003(e).
The corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
ht!p://www.secretary.state.nc.us/Corr)orations/­CSearch.as�px
VIL DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from
http://portal.ncdenr.orgZweb/wg/ws/su/statesw/forms does. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, that the covenants will be binding on 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 NC DWQ, and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer:Phillip G. Tripp, P.E.
Consulting Firm: Tripp Engineering, P.C.
Mailing Address:419 Chestnut Street
City: W ilmington
Phone: [phone]
Email:[e-mail]
State:NC Zip:28401
Fax: (910 ) 763-5631
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Information, item 2a) John W. Anagnost , certify that I
own the property identified in this permit application, and thus give permission to (print or hjpe name of person
listed in Contact Information, item la) Babatunde Olatidoye with (print or hjpe name of organization listed in
Contact Information, item la) Coba Ventures LLC to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
Form SWU-101 Version 06Aug2012 Page 5 of

As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DWQ Stormwater permit reverts back to
me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a
completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment
facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid
permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including
the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
nn� a Jko i z 10/ L.
Signature: JtA W Date: l
I, 91 rc IA i. >k-A-. cf11 1 � Notary Publicforthe State of & hr 1-k `Lilo /i , a County of
n) N +o�e1�� , do hereby certify that JokI LJ DtnctrnOSF personally appeared
before me this JET day of J)e C 201-2 _ and acknowledge the due execution for
a stormwater permit. Witness my hand and official seal,
SEAL
My commission expires i cro . , 3 D 0 t-7
X. APPLICANT'S CERTIFICATION
I, (print or hjpe name of person listed in Contact Information, item la) Babatunde Olatidoue
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of the
applicable stormwater rule�a.�21-1.1000 and any other applicable state stormwater requirements.
Date:
I. 0c [it,_ C (W I rd a Notary Public for the State of N(Ab Colo lj' 1]ac , County of
PCM eC do hereby certify that Zaz)AY-d,1 C) f 0-fidc j 0 personally appeared
before me this L day of �` 2 " and acknowledge the due execution of the application for
a stormwater permit. Witness my hand and official seal, C o� 'zci(`
SEAL
My commission expires_ /0 -
Form SWU-101 Version 06Aug2012 Page 6 of 6

Johnson, Kelly
From: Lee Galloway [[e-mail]]
Sent: Friday, December 14, 2012 11:43 AM
To: Johnson, Kelly; [e-mail]
Cc: Lewis, Vincent
Subject: RE: Serenity Point
1 misread where you were going with the trench/fill question. Let me clarify and revise my response. The revised
response to question 1, b is No. The trenches will be installed on top of natural soil. Fill material will be added on too of
the trenches to bring everything else up to proposed grade. Therefore the trench design will be in compliance with DENR
regs. Sorry for the confusion.
Just send the package back and I will re -submit it (with comments below addressed) after I have a site meeting with
Vince.
Have a good weekend.
Thanks.
Lee Galloway
Tripp Engineering, P.C.
(p) 910.763.5100
(f) 910.763.5631
[e-mail]
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.
From: Johnson, Kelly [mailto:[e-mail]]
Sent: Friday, December 14, 2012 11:27 AM
To: Lee Galloway; [e-mail]
Cc: Lewis, Vincent
Subject: RE: Serenity Point
Lee,
The fill may be an issue. Infiltration in fill is prohibited by rule unless it is approved on a case by case basis [15A NCAC 2H
.1008(d) (7)]. This would be considerably more fill than I have seen Vince approve in the past. I just looked at his
calendar and he is out until 12/27 (-2 weeks). I think it would be best to return the application until Vince can get out to
the site. I will send the attached letter today. (As a side note, if infil trenches don't work out you may want to think
about permeable pavement. The design as re -done in October and it now gives 75% credit for A&B soils and you can
also route adjacent roofs to the pavement and get some credit for the roofs, too. You may be able to get under the LD
threshold that way, and perm pavement can go on fill if you do it the way the manual specifies.)
Kelly
From: Lee Galloway [mailto:lee-trippeng(alec.rr.com]
Sent: Friday, December 14, 2012 11:04 AM

To: Johnson, Kelly; ptripp0)ec.rr.com
Cc: Lewis, Vincent
Subject: RE: Serenity Point
Kelly,
We should be able to get this back to you early next week. I left Vince a voicemail to set-up a site visit. Hopefully we can
get it completed early next week. The other items I should be able to address quickly.
See my responses below in red.
Thanks.
Lee Galloway
Tripp Engineering, P.C.
(p) 910.763.5100
(f) 910.763.5631
[e-mail]
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.
From: Johnson, Kelly[mailto:kelly.p.johnson()ncdenr.gov]
Sent: Friday, December 14, 2012 10:33 AM
To: Lee Galloway; ptripp0)ec.rr.com
Cc: Lewis, Vincent
Subject: Serenity Point
Phil & Lee,
We received this application, and I have a couple of questions for you:
1.) Soils
a. Has Vince been to this site? No. I have called Vince to set-up a site visit.
b. Will the trenches be in fill? The existing grade reads—5-6msl and the proposed grade will be 8.5. Yes,
the trenches will be in fill because we have to raise the lots to get the FFE above the floodplain
elevation.
c. Can you send the elevations of the existing grade, the depth to the SHWT and the resulting SHWT
elevation? Can you clarify "resulting SHWT"?
d. The boring for BMP H2 isn't inside the footprint. We need the boring in the footprint unless Vince has
made an alternate determination based on his site visit. We will note this with Vince and address.
2.) ORW: It looks like this will be within 575ft of ORW which has a max 25%. This is 25.4%. If this is subject to the
ORW clause (see yellow highlighting attached), please make sure the project is 25%. Noted. We will revise the
plan to be in compliance with the 25% density requirement.
3.) Deed Restrictions: Please provide deed restrictions. We will provide in resubmittal.
4.) Project Area: Please show the project area on the map. If the entrance drive is being built to service this
development please make sure that it is counted in the BUA calcs. We will note the project area on the revised
plan. The entrance drive is existing and we are not making any revisions/improvements to it.
5.) Drainage Area Maps: Please provide DA maps. We will provide in resubmittal.
Are these items fairly simple and can be resolved by early next week? If not, please let me. I will have to return the
application because I cannot hold uncashed checks for more than a few days.
Thanks,

KJ
***My email has changed to kellv.o.iohnson@@ncdenr.gov
►LeLL' ohwsow
Kelly Johnson
Environmental Engineer
Division of Water Quality
Stormwater Permitting
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Office: 910.796.7331
Fax: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.

Johnson, Kelly
From:
Johnson, Kelly
Sent:
Friday, December 14, 2012 10:33 AM
To:
'Lee Galloway'; [e-mail]
Cc:
Lewis, Vincent
Subject:
Serenity Point
Attachments:
0000_Regulations_2008 Coastal Rule.doc
Phil & Lee,
We received this application, and I have a couple of questions for you:
1.) Soils
a. Has Vince been to this site?
b. Will the trenches be in fill? The existing grade reads—5-6msl and the proposed grade will be 8.5.
c. Can you send the elevations of the existing grade, the depth to the SHWT and the resulting SHWT
elevation?
d. The boring for BMP #2 isn't inside the footprint. We need the boring in the footprint unless Vince has
made an alternate determination based on his site visit.
2.) ORW: It looks like this will be within 575ft of ORW which has a max 25%. This is 25.4%. If this is subject to the
ORW clause (see yellow highlighting attached), please make sure the project is 25%.
3.) Deed Restrictions: Please provide deed restrictions.
4.) Project Area: Please show the project area on the map. If the entrance drive is being built to service this
development please make sure that it is counted in the BUA calcs.
5.) Drainage Area Maps: Please provide DA maps.
Are these items fairly simple and can be resolved by early next week? If not, please let me. I will have to return the
application because I cannot hold uncashed checks for more than a few days.
Thanks,
KJ
*** My email has changed to [e-mail]
►ceLLW0hws0w
Kelly Johnson
Environmental Engineer
Division of Water Quality
Stormwater Permitting
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Office: 910.796.7331
Fax: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.

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Review Checklist
Project Name: \-b\ \r-T Received Date: 13 2EG 00 1 A
Project Location: (C\rts to6 cv-t\,) Accepted Date:
IRule(s) OrO08 Coastal 1995 Coastal Phase II (WiRO) Universal �1988 Coastal
Type of Permit:ye or Mod or PR Existing Permit # (Mod or PR): EDPE Cert on File? 1
Density: l HAD J or LD
%: Lk ❑(%OK?)
Type: Commercial or Msidentia
uNCG:
[--]Offsite to SW8
nExempt
Stream Class: SR�oR\J SA Map
Subdivided?: Subdivision or Single Lot
I FlCRW Map
Paperwork Emailed Engineer on: )L( Wg, , ),a,
DSupplement(s)(loriginalperBMP) BMPType(s): �•r�•\ Trtav\c�c, oOliorJ LI
"O&M with correct/original signatures (1 original per BMP except LS/VFS and swoles) n
Dgpplication with correct/original signatures Wh A 1bc\r\cj m 4Mo 15n • �Dlpnrlt �
`J'
ki\Y\G.e %SITED Tti\j StT>: ;
nCgr-p o LLC: Sig. Auth. per SoS or letter Note to Reviewer:
(within 6mo)
Soils Report with SHWT
REalculations (signed/sealed)
ONb obvious errors
includes common areas, etc
Restrictions, if subdivided:
!ned & Notarized
'OQIV•• (3N'(t1w 5'15 V-T M H W ? (d6% mo.x)
• l CCO 5Lt<IP-1kt)N 5 0 F 5 tiWl e kr
r —P%5 -�E cteDI\60EQ
?(Ueck- qnx 7 C I Oo p 1v\c.ludd 7 �Uiu7
q,c `I,�C 9,)( poFae of �(v�v\J �Qn,s dzve)opfAW7�
UY Xm eNICw
Plans
M2 Sets Details (roads, cul-de-sacs, curbs, sidewalks, BMPs, Buildings, etc)
Grading Wetlands: Delineated or No Wetlands
Vicinity Map M Layout (proposed BUA dimensions)
Legend �DA Maps El Project Boundaries
Infiltration Wet Pond Offsite
oils Report Soils Report MPE Cert for Master Lot #:
SHWT SHWT: El Deed Rest for Master Lot # Matches Master
Bottom: PP: BUA Permitted (Master): sf
Visited: BUA Proposed (Offsite): sf
Additional Information:
Permitted Proposed: Proposed: Proposed:
BUA (sf)
DA (sf)
PP (el)
SHWT (el)
Depth (ft)
SA (sf)

TRII'P ENGINEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] • FAX: [phone]
December 13, 2012
NCDENR
Division of Water Quality
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Kelly Johnson
Re: Serenity Point
TE 12033
Dear Kelly:
2012
Enclosed please find the following items for the above referenced project:
. 2 sets of plans
. $505 check
. Narrative
• Stormwater application — one original and one copy
• (2) Infiltration Trench Supplements
• Operation and Maintenance Agreement
. 2 sets of calculations
• USGS map
• Soils Report
• Copy of the Deed
• Secretary of State Information
Please review for approval and contact us with any questions, comments or if
you need additional information. Thank you.
Sincerely,
Tripp Engineering, P.C.
2Valtlow�a�yW4
ALG:dcb
Enc.
c=cF=aVF-
DEC 13 2012
BY:

TE 12033
Stormwater Drainage System & Erosion Control
Narrative
Serenity Point
4616 Serenity Point, Wilmington, NC
The Serenity Point project is a proposed residential development located at 4616 Serenity
Point in Wilmington, NC, New Hanover County, parcel ID # R07217-007-003-000.
Serenity Point is owned by Coba Ventures, LLC. The entire site is approximately 2.04
acres of land, of which 1.5 acres is proposed for disturbance. Serenity Point will be
serviced by CFPUA for public sewer and water. The site is adjacent to the Intracoastal
Waterway and includes CAMA setbacks as shown on the plan.
Coba Ventures, LLC is proposing four residential lots, gravel roadway, future sidewalks,
and two underground infiltration systems. New impervious area for this project is
estimated to be 22,965 sf. (0.53 acres). After project completion, the total amount of
impervious area for this site will be approximately 25.4% of the entire site. The
estimated amount of disturbed area is 1.5 acres.
The site will have two drainage areas. No off -site runoff flows onto the site and
therefore, none will be routed to the proposed BMP's. All outflow from the drainage
basins will drain to the Intracoastal Waterway; classification SA;ORW, Index No. 18-87-
(25.5), in the Cape Fear River Basin. All built up areas (BUAs) will be collected and
routed to the underground infiltration system BMP's.
The infiltration basins are designed to meet the State's 1.5" requirement and alternately
sized for the 1-yr, 10-yr, 25-yr, and 100-yr storm events. Calculations have also been
provided to demonstrate that the 10-yr 24-hour storm event can be infiltrated without
discharging the system using an infiltration rate of one-half of the infiltration rate
reported in the soils report, therefore waiving the State required off-line bypass and
vegetated filter strip. To evenly distribute discharge to the infiltration basin, separate drop
inlets are proposed around the perimeter of the basin. The maximum volume allowed per
inlet is 2.0 acre -inches (NCDENR BMP Manual section 16.3.3,2). The infiltration
system was designed to meet or exceed current State and County requirements and is
designed for high density projects. Outflow from the infiltration systems will be directed
through proposed control structures that will discharge stormwater via overland flow.
The SHGWT elevation is approximately 2' below the proposed bottom elevation_in the„ —
infiltration systems. �Q lE M �N E
DEC 112111
13v:.

r
TE 12033
Prior to clearing of the site, a construction entrance and temporary silt fence will be
installed. The removal of trees and vegetation will occur. The roadway and building
locations will then be graded. Underground utilities, including the stormwater drainage
system will be installed and inlet protection put into place. Temporary erosion control
measures will remain in -place until such time as when areas are stabilized. Permanent
measures include permanent stands of grass. Specific measures and directions to the
contractor are noted on the plans. Please refer to Sheet C2 for detail erosion control
measures and construction sequence.
Summary
For this project, all on -site drainage will be collected by a stormwater drainage system
and routed to two underground infiltration systems. The infiltration systems have been
sized to detain the pre/post development runoff for the 24-hour 1-yr, 2-yr, 10-yr. 25-yr.,
and 100-yr. storm events and to capture the first 1.5" of runoff from the new
development. Temporary erosion control measures include one gravel construction
entrance, silt fence, and seeding. Permanent erosion control measures include established
grass areas.
F�EIVE..
DEC 13 2012
BY:---- —_

11/1212 Serenity Point 12033
ALG CN and C Values
PRE DEVELOPMENT
Determine Composite CN Value from TR-55 Table 2-2
'Soil Type Sand
Description HSG
CN A (ac)
CN x A
Impervious A
98 0.00
000
Woods (Fair) A
36 0.86
3096
086
3096
Composite CN Value = 36
Pre Development Composite Runoff Coefficient
Description
C
A (ac)
C x A
Impervious
0.95
0.00
0
Woodlands (2%-7%)
0.20
0.86
0 172
086
0,172
Composite C value =
0 20
POST DEVELOPMENT- INFILTRATION TRENCH #1
Determine Composite CN Value from TR-55 Table 2-2
'Soil Type: Sand
Description HSG CN A (ac)
CN x A
Impervious - 98 027
26.46
Open Space (Good) A 39 021
8.19
Woods (Good) A 30 0.00
000
0.48
34.65
Composite CN Value = 72
Post Development Composite Runoff Coefficient
Descnption
C
A (ac)
C x A
Impervious
0.95
0.27
0.26
Pastures, Grass (Sandy)
015
021
0.03
Woodlands (0%-2%)
0.10
000
0
048
0.288
Composite C Value =
0.60
POST DEVELOPMENT - INFILTRATION TRENCH 42
Determine Composite CN Value from TR-65 Table 2-2 `Soil TypeSand
Description HSG
CN
A (ac)
CN x A
Impervious -
98
0.25
24.50
Open Space (Good) A
39
0.13
5.07
Woods (Good) A
30
0.00
0.00
0.38
29.57
Composite CN Value =
78
Post Development Composite Runoff Coefficient
Descnption
C
A (ac)
C x A
Impervious
0.95
025
024
Pastures, Grass (Sandy)
015
0.13
0.02
Woodlands(0%-2%)
0.10
000
0
0.38
0 257
Composite C Value =
0.68
Total Drains a Area
s tt
acres
20,780 1
048
Post Development Inn rvlous Area
Land Use
I scI ft.
I acres
Pro sed Building
5.600
0 13
Gravel Road
2.015
0.05
Concrete (Driveway/Utility Pad
2.550
0.06
Future Sidewalk
520
0.01
Future Impervious
1,000
002
Total
11,665
027
%impetuous = 0 562
= 56 2%
Total Drains a Area
s . ft acres
16,770 0 38
Post Develo mant III m rvious Area
Land Use
s . ft
acres
Proposed Building
5,600
0.13
Gravel Road
2,145
005
Concrete Dnvewa /Utih Pad)
1,610
0.04
Future Sidewalk
580
0.01
Future Impervious
1,000
0.02
Total
10.935
0.25
•'V
1111111111//�1�
�N CARO�tip.
.�oFEssio;�.:;L9
9< i
t, SEAL n a
% impervious = 0 652
= 65 2%
rj0)ZCE13 2b12
G UOBS12012112033SerenitylcalcsU2033CN 8 C Value Calcs 11-12-12

11112/12 Serenity Point 12033
ALG 25 and 100 Year Storm Pipe and HGL Calculations
LOCATION
AREA
RUNOFF
RAIN
INCREMENTAL
TOTAL
I PIPE DATA
COEFF.
INT.
FLOW
FLOW
O-CIA
O=CIA
O
Friction
Pontl
Inlet WS
Rim
FROM
TO
TOTAL
TOTAL
C
(C.F.S.
(C.F.S.
TYPE
N
LENGTH
S%
SIZE
VEL.
AVAIL.
Loee (Hf)
I.
Elev.
Elov,
(SUB
Acm)
IAcre
(INhr)
REO'D
REO'D
"
in
f s
cra(H
ry)
(ri
ry)
25 YEAR
GI #1
Infilt. #1
0.26
026
1 0.70
8 15
1 48
1A8
HOPE
0.011
20
1.50%
15
1.2
9.38
0.0073
5.00
5.01
550
GI #4
JB #1
008
0.08
070
8 15
0.46
046
HOPE
0 011
24
0 40%
12
06
267
00025
5.50
552
5.20
GI #3
GI #2
007
0,15
070
8 15
040
086
RCP
0 013
50
1 00 %
15
0.7
648
0,0060
5.50
552
5.50
GI #2
JB #1
0.04
0 19
070
8 15
023
1 08
HOPE
0 011
25
0 40%
15
0.9
4.84
0.0048
550
5 51
610
JB #1
Infilt. #2
000
0.27
0 70
8.15
000
1 54
HOPE
0.011
22
0 90%
15
1 3
726
0.0086
550
551
7.50
100 YEAR
GI 91
Infilt #1
0.26
026
070
9.60
1.75
1 75
HDPE
0 011
20
1 50%
15
1 4
938
0,0101
500
501
550
GI#4
JB#1
008
008
070
960
054
054
HOPE
0011
24
040%
12
0.7
2,67
00035
550
553
520
GI #3
GI #2
007
0 15
070
9.60
0.47
1.01
RCP
0 013
50
1 00%
15
08
648
0.0084
550
553
550
GI #2
JB #1
004
0.19
070
960
0.27
1 28
HDPE
0.011
25
0 40%
15
1.0
4.84
00067
550
5 52
6.10
JB #1
Infilt.#2
000
027
070
9.60
000
181
HDPE
0011
22
0.90%
15
1.5
Z26
00119
550
551
750
c UOBS251ZI20D-Serem alm112033 i5pL IWn aen ppn n HeL I1-11.4

11/12/12 Serenity Point J#: 12033
AL6 Infiltration Trench #1
Simple Method - Volume Required / Provided Calculations
OPTION #V
Storage Volume -SA Waters -1.5' Runoff
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv= 005-00090,)
Rv = Runoff CoeKcrent = storm runoff (inches) / storm rainfall (inches)
h = Impervious Fraction = Impervious Penton of the drainage area (acres) ) Drainage area (acres)
I,t= 562 %
Rv= 056
Design Rainfall Depth = 1 50 In
Drainage Area = 048 cans
Volume Required = 1,444 fta
OPTION #2:
Storage Volume - SA Waters - Pre -Development Runoff
1 - Year, 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
vrliere
Rv= 0 05+0 0090a)
Rv = Runoff Coemaent = storm mnoff hnrhes) / storm rainfall (inches)
IA = Impervious Fraction = Impemous portion of the damage area (acres)) Drainage area (acres)
Pre-Dev. Impervious Area =
0 ft`
Pre-Dev. Drainage Area=
20,780 Ra
V
000 %
Rv=
0050
Design Rainfall Depth = 388 in
Drainage Area = 048 acres
Volume = 336 ft3
Storage Volume - SA Waters - Post -Development Runoff
1 - Year, 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Dranage Area)
%mere
Rv = 0 05+0 DWI,)
Rv = Runoff Coefficient = storm runoff (Incites) / storm rainfall (Inches)
h = Impervious Fraction = Impervious portion of the drainage area (acres) ) Drainage area (acres)
Post-Dev. Impervious Area = 11,685 ft'
Post-Dev. Drainage Area 20.780 ft'
l 562 %
Rv = 0 556
Design Rainfall Depth = 388 In
Drainage Area 0.48 acres
Volume = 3.736 ft'
DIFFERENCE IN VOLUME BETWEEN PRE)POST (1YR, 24 HR)= 3.400 ft,
Volume Provided (Raintank Infiltration Svstem
Surface Area of Trench = 2.635 ft'
Depth of Trench = 2 27 ft
Void Spare= 095 (for Ramtanks)
VOLUME PROVIDED= 5,682 R'I Vprovided>Vrequiretl OK
Total Drainage Area
zq. ft. acres
20,780 1 0.48
Post Development Impervious Area
Land Use
St. ft.
acres
Proposed Building
5,600
0.13
Gravel Road
2,015
0.05
Concrete (Drrveway/Utilay Pad)
2,550
0.06
Future Sidevralk
520
0.01
Future Impervious
1,000
002
Total
11,685
027
%impervious = 0 562
= 56 2%
GVOWN2012\12033-$eeeniry\[a kt\rrenN 11\1203U Infi-1- nTI-11 11 Sloiage Vdume cal. 15—h11-13-12

11/12/12 Serenity Point
ALG Infiltration Trench #1
Filter Strip & Offline Bypass Waiver
(Half Infiltration Rate)
'NOTE. Calculations provided below are for the Vegetated
Filter Strip & Offline Bypass Waiver per NCDENR BMP
Manual Section 16.3.9(4). Option #4.
Design Option #4:
Infiltration Rate, Reported, in/hr:
1.30
Area, Bottom of trench, :
2,635
Volume Required, Total, ft :
3,400
Volume Provided in Trench, ft :
5,682
Runoff depth for 10 yr 24 hr storm, inches
7.00
Time to Drawdown 10yr volume, day:
1.97
Time to Drawdown 10yr volume, hr:
0.08
Proposed Impervious, Total, ft2:
11,685
Drainage Area, Total , ft2:
20,780
RVpost Development, Overall:
0.56
Volume of 10 yr. 24 hr storm, ft :
6,741
Volume infiltrated in 24 hours, ft :
3,426
Remaining volume to store, ft :
3,315
Is the Volume Stored>= Min. Vol. (1.5"or lyr24hrpre/post)?
Y
Is Volume Provided >= Remain Vol. to Store?
Y
J#:12033
G:UOBS\2012\12033-Serenity\calcs\Trench 41\12033 -Filter Strip & Bypass Waiver Option p4 Trench 111-12-12

11/12/12 Serenity Point
ALG Infiltration Trench #2
Simple Method - Volume Required / Provided Calculations
OPTION #1'
Storage Volume - SA Waters -1.5" Runoff
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
Total Drainage Area
sq. h.
acres
where
1 16,770
1 038
Rv= 0.05+0.009(Ia)
Rv = Runoff CcefRuent = storm runoff (inches) I storm rainfall (inches)
h = Impervious Fraction = Impervious Portion of the drainage area (acres) I Drainage area (aces)
I,= 65.2 %
Rv= 064
Design Rainfall Depth = 1 50 in
Drainage Area = 038 acres
Volume Required = 1,335 f13
OPTION #2:
Storage Volume - SA Waters - Pre -Development Runoff
1 - Year. 24 hour Runoff Volume
Volume of Runoff = V = (36W) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv = 0.05+0 009(1a)
Rv = Runoff Coefficient = storm runoff pnUtes) I storm rainfall (inches)
Iq = Impervious Fraction = Imperious portion of the drainage area (acres) I Drainage area (acres)
Pre-Dev. Impervious Area= 0 ft,
Pre-Dev. Drainage Area= 16,770 ft'
la= 000 %
Rv = 0 050
Design Rainfall Depth = 388 in.
Drainage Area 0.38 acres
Volume = 271 h3
Storage Volume - SA Waters - Post -Development Runoff
1 - Year. 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv = 0 05+0.009(Ir,)
Rv = Runoff Coeffuenl = $loam runoff Qnches) I storm rainfall (inches)
1„ = Imperaws Frac on = Impervious potion of the drainage area (rues) I Drainage area (acres)
Post-Dev. Impervious Area 10.935 h'
Post-Dev. Drainage Area 16,770 ft'
1, 652 %
Rv= 0.637
Design Rainfall Depth = 388 in
Drainage Area = 038 acres
Volume = 3.453 ft,
DIFFERENCE IN VOLUME BETWEEN PREIPOST (1 YR, 24 HR) = 3,182 ft,
Volume Provided (Ralntank Infiltration Svstem
Surface Area of Trench = 1,400 h2
Depth of Trench = 29 It
Void Space = 095 (for Rainlanks)
VOLUME PROVIDED = 3,844 ft' I Vprovided> Vrequired OK
Post Development Impervious Area
Land Use
sq h.
acres
Proposed Building
5,600
0.13
Gravel Road
2,145
0.05
Concrete (Driveway/Utiiity Pad)
1,610
0.04
Future Sidewalk
Sg0
0.01
Future Imperwaus
1,000
0.02
Total
10,935
0.25
% impervious = 0.652
= 65.2%
)8: 12033
a VOM\2012U2033seremMramgnm[h I2\12030I fll,atPon nmN 92 Slu,age vdume CLn IsInm 1142az

11/12/12 Serenity Point
ALG Infiltration Trench #2
Filter Strip & Offline Bypass Waiver
(Half Infiltration Rate)
'NOTE: Calculations provided below are for the Vegetated
Filter Strip & Offline Bypass Waiver per NCDENR BMP
Manual Section 16.3.9(4). Option #4.
Design Option #4:
Infiltration Rate, Reported, in/hr:
5.00
Area, Bottom of trench, ft :
1,400
Volume Required, Total, ft :
3,182
Volume Provided in Trench, ft :
3,844
Runoff depth for 10 yr 24 hr storm, inches
7.00
Time to Drawdown 10yr volume, day:
0.89
Time to Drawdown 10yr volume, hr:
0.04
Proposed Impervious, Total, ft2:
10,935
Drainage Area, Total , ft2:
16,770
RVPost Development, Overall:
0.64
Volume of 10 yr. 24 hr storm, ft :
6,230
Volume infiltrated in 24 hours, ft:
7,000
Remaining volume to store, ft :
_770
Is the Volume Stored >= Min. Vol. (1.5" or lyrNhrpre/post)?
Y
Is Volume Provided >= Remain Vol. to Store?
Y
1#: 12033
G:\JOBS\2012\32033-Serenity\calcs\Trench #2\12030- Fitter Strip & Bypass Waiver Option 114 Trench #2 11-12-12

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http://Map-pass.mytopo.comlmapslprint—Mytopo.asp?print--20&scale=5&layer--DRG&la... 11/12/2012

I

RFIS
Soils Engineering and Testing Services
Tripp Engineering, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Attention: Mr. Phil Tripp, P.E.
October 16 2012 ,02
Reference: Infiltration Testing and Seasonal High Watertable Estimates
Serenity Point
Serenity Point at Channel Haven
Wilmington, North Carolina
RFTS Job No. 782-12
Dear Mr. Tripp:
RFTS is pleased to provide testing services during the design phase of the residential
development located off Serenity Point in the Channel Haven development in Wilmington, North
Carolina. Specific site grading plans had not been provided to us at the time this report was
prepared.
DESCRIPTION OF ACTIVITIES AND FINDINGS
As requested, our staff visited the site on October 9, 2012, to perform infiltration testing and
estimate the seasonal high watertable at two locations identified by you. The purpose of this
testing was to provide soil parameters for stormwater infiltration design.
Seasonal High Watertable Estimate
Hand auger borings were advanced at two locations to a depth of approximately 5 feet below the
existing ground surface in areas proposed by the civil designer for infiltration structures. The
encountered soils were logged and visually classified by depth and a Munsell Soil Color Chart
was used to determine the hue, value, and chroma of the visually distinct soil layers. Our soil
logs are presented in Table 1.
fNF-1
Soils encountered in our boring at this location consisted of interbedded relatively clean fine
sands with the exception of the soils in the upper 7 inches which were clayey sands and are likely
fill soils. No distinct zones of soil cementation were encountered in the profile. Based on our
experience with similar soils and comparisons of the soil coloration to the Munsell Chart, it is
our opinion that the seasonal high water table occurs approximately 45 inches below the ground
surface. A measurement made 1 hour after augering indicate a depth to standing water in the
boreholes of 48 inches below the existing ground surface.
5, PLLC 130 mry
5 3A Carolina Beach Ave N p Cnrtted to Responsive Service Phone [phone]
130
Carolina Beach, North Carolina 28428 muntr.rftspllc,com Email davidwinstead@charter net

Tripp Engineering, P.C.
RIFTS Job No. 782-12
fNF-2
October 16, 2012
Page Two
Soils encountered in our boring at this location consisted of interbedded relatively clean fine
sands with no distinct zones of soil cementation in the profile. Based on our experience with
similar soils and comparisons of the soil coloration to the Munsell Chart, it is our opinion the
seasonal high water table occurs approximately 45 inches below the ground surface. A
measurement made 1 hour after angering indicate a depth to standing water in the boreholes of
50 inches below the existing ground surface.
Infiltration Testing
Infiltration testing was performed using a model 2800 Guelph Permeameter which is a
constant -head device which operates on the Mariotte siphon principle and is referenced in ASTM
D-5126. The permeameter is used to determine field saturated hydraulic conductivity in
centimeters per second for soil at a specified depth. This testing involves advancing a borehole to
the desired infiltration depth and introducing water at a constant head to determine the steady
state flow rate from which the hydraulic conductivity can be calculated.
Our testing was performed at approximately 21 inches below the ground surface at both INF-1
and INF-2, and was approximately 27 inches above the seasonal high water estimate. The results
of our permeameter testing are presented in Table 2.
RECOMMENDATIONS
Based on the results of our field testing and soil classifications at the test location, we offer the
following recommendations for stormwater infiltration design:
At the test locations INF-1 and INF-2, it is our opinion that in order to achieve the steady state
flow rates obtained during our testing; the areas of infiltration galleries or other infiltration
structure should introduce stormwater at approximately 24 inches below the existing ground
surface elevation. For purposes of sizing the structure we recommend an ultimate application rate
of 1.3 and 7.7 inches per hour, respectively. These recommendations should be reviewed by
appropriate regulatory authorities before finalizing the details of any civil design.

Tripp Engineering, P.C.
RFTS Job No. 782-12
CLOSURE
October 1, 2012
Page Three
Please find attached our field data and a sketch showing the approximate test locations. If you
have any questions after reviewing this letter, please do not hesitate to contact us at your
convenience.
Sincerely,
RFTS,PLLC /
David L. Winstead Steven D. Ke 1 P.E.
Field Operations Manager Senior Enginee
DLW:SDKPoIw
NC Registratio No. 17638
Attachments CARpt�`°`•.
SEAL
17638
L

Table 1
Munsell Soil Classifications
Serenity Point
Wilmington, North Carolina
RFTS Job No. 782-12
Loc
Soil Description
Hue
Value
Chroma
Depth
(in.)
Comments
INF-1
Topsoil
-
-
0-2
Brownish Yellow fine to medium
SAND with Clay
1 OYR
6
6
2-7
Possible Fill
Soil
Very Dark Brown fine to medium
SAND with Shell fragments
1 OYR
2
2
7-13
Dark Yellowish Brown fine
SAND
IOYR
3
4
13-20
Yellowish Brown fine SAND
1 OYR
5
6
20-33
Light Yellowish Brown fine
SAND
1 OYR
6
4
3345
Moist
Light Brownish Gray fine SAND
1 OYR
6
2
45-57
SHWT@45"
/11120 48"
INF-2
Topsoil
-
-
0-8
Dark Yellowish Brown fine
SAND
I OYR
4
6
8-17
Pale Brown fine SAND
1 OYR
6
3
17-34
Light Yellowish Brown fine
SAND
1 OYR
6
4
3440
Yellowish Brown fine SAND
I OYR
5
6
40-45
Moist
Dark Yellowish Brown fine
SAND
IOYR
4
6
45-58
SHWT@45"
/1120 50"
Dark Yellowish Brown fine
SAND
1 OYR
4
4
58-63

Table 2
Guelph Permeameter Test Results
Serenity Point
Wilmington, North Carolina
RFTS Job No. 782-12
Location
INF-1
INF-2
Depth (in.)
21
H, (cm)
5
5
R, (cm/min)
6.4
12.7
Ris
(cm/sec)
0.106
0.212
Hz (cm)
10
10
Rz (cm/min)
8.8
19.0
Res
(cm/sec)
0.146
0.317
K& (cm/sec)
9.22x10
5.45x10
Kr, (in/hr)
1.3
7.7
Definition of Terms
R%2 — Established 3 or more constant rate of water level change (cm/min)
RIS, 2S — Calculated steady state flow rates (cm/sec)
Hi,2 — Maintained Head of H2O (cm)
Kt, — Calculated field saturated hydraulic conductivity (cm/sec)
rpm — Matric flux potential (cm/sec)
a — Alpha parameter
Depth — Depth of well hole (in.)
Location — Test location identification number
Note: Diameter of well is 3.0 cm.

RFIS
Soils Engineering and
Testing Services
INFILTRATION TESTING AND SHWT ESTIMATES
SERENITY POINT AT CHANNEL HAVEN
WILMINGTON, NORTH CAROLINA
JOB NO. 782-12
M
FIGURE I
DRAWING NOT TO SCALE
DATE: 10/16/12
SKETCH. DLW
REVIEW: SDK
Legend
19 APPROXIMATE TEST LOCATION
RFTS,PLLC
1305 3A Carolina Beach Ave N
Carolina Beach, North Carolina 28428
Office: 910-470-7450

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.... .. ._ .. .. County o. the ...... day of 19
Mail after recording to . John W_ Anagnost and Wife, .Eathleen Jewell.......
This instrument wd Prepared by W. A1Len.Lohb[ Sr.. .
Brief description for the Index "
36 NORTH CAROLINA GENERAL WARRANTY DEED
THIS DEED made thiJ/3o7f day of ... December 19 89
by and between
GRANTOR 1 GRANTEE
WALTER F. JOHNSTON and wife,
MARGARET S. JOHNSTON
JOHN W. ANAGNOST and wife,
KATHLEEN JEWELL
Ent's In .11nIn 4 [Neh ter ore Wty: don, sder s.. .ed, u ayynprlale, eh.r.eler .t snort. a¢ earpanWe er Wtaerfhl}
The deaign.fion Grantor and Grantee as used herein shell include said parties, their heirs, eucceaso,s and assigps, and
shall include singular, plural, m"oulme. feminine or neuter a. required by context.
WITNESSETH, that the Grantor, for a valuable considentmn p.ld by the Grantee, the receipt of which ie^tierlby
acknowledged,`r
has and by these presents does ent, bargain, sell and convey unto the Grantee In fee simple; al� that
certain lot or parcel of land situated in the City of ...., -.
lldhiv,
...New Hanover .County, North Carolina and more Particularly described'
asfollows: -----
'
ATTACHED DESCRIPTION
MARKED "EXHIBIT A"
RETURNED To Oil
172367 asq- t�l
N.C. L[ Aw[ I.[m N..10 Irir, a[rn[e Iyl).

a LIMITED LIABILITY COMPANY ANNUAL
NAME OF LIMITED LIABILITY COMPANY: Coba Ventures, LLC
SECRETARY OF STATE ID NUMBER: 1080927
REPORT FOR THE YEAR: 2012
SECTION A: REGISTERED AGENrs INFORMATION
1. NAME OF REGISTERED AGENT: Cbristance Olat
2. SIGNATURE OF THE NEW REGISTERED AGENT:
3. REGISTERED OFFICE STREET ADDRESS 8. COUNTY
416 West Ridge Street
Rose Hi!!, NC 284S8 Dup/in
SECTION B: PRINCIPAL OFFICE INFORMATION
1. DESCRIPTION OF NATURE OF BUSINESS: Real Estate
STATE OF FORMATION: NC
SOSID: 1080927
Date Filed: 2/1/2012 2:19:00 PM
Elaine F. Marshall
North Carolina Secretary of State
CA201203200374
q on use my
Changes® o
SIGNATURE CONSTITUTES CONSENT TO THE APPOINTMENT
4. REGISTERED OFFICE MAILING ADDRESS
P.O. Box 3743
Wilmington, NC 28406
2. PRINCIPAL OFFICE PHONE NUMBER: [phone]
3. PRINCIPAL OFFICE EMAIL: ndps awe/lsouth.net
4. PRINCIPAL OFFICE STREETADDRESS & COUNTY
S. PRINCIPAL OFFICE MAILING ADDRESS
416 Wes[ Ridge Street
P.O. Box 3743
Rose i1i/!, NC 28458 Dup/in County
Wilmington, NC 28406
SECTION C: MANA ERsfMEMBERS/ORGANIZFRc
(Enter additional Managers/Members/Organizers in Section E.)
NAME: Constance Olatidoye NAME: Babatunde Olatidoye NAME:
TITLE: Member
TITLE: Member ADDRESS: s,.�yj�
a �� TITLE:
ADDRESS:
P.O. Box 3743 ADDRESS:
P.O. Box 3743
Wilmington, NC 28406
Wilmington, NC 28406
SECTION D: CERTIFICATION OF ANert IAL REPORT
Section D must be completed in its entirety by a person/business entity.
Fam mull be sgnm SIGNATURE
by a Mang,, plied urMer cs C ohms form DATE
Constance
Pnnt or Type Name -(Manager/Member
member/manager
THIS ENTITY DOES NOT QUALIFY FOR THE 2011 ANNUAL REPORT FILING FEE EXEMPTION GRANTED UNDER SL2010-31TITLE ---
S LMIT THIS ANlyl, R�ORT WITH TH II IIIIIIIIIIIIII�IIIIIIIIIIIIII III
MAIL TO $enetery of State Co EFFOI IR D FI IN F E OF g200 rpora6ons Dirsron, Posl OKce Box 29625, Raleigh, NC 27626-0526

State of North Carolina
Department of the Secretary of State
Limited Liability Company
ARTICLES OF ORGANIZATION
SOSID: 1080927
Date Filed: 1/26/2009 4:28:00 PM
Elaine F. Marshall
North Carolina Secretary of Stale
C200836600238
Pursuant to §57C-2-20 of the General Statutes of North Carolina, the undersigned does hereby submit
these Articles of Organization for the purpose of forming a limited liability company.
1. The name of the limited liability company is: Coba Ventures, LLC
2. If the limited liability company is to dissolve by a specific date, the latest date on which the
limited liability company is to dissolve: (Ifno date for dissolution is specified, there shall be no
limit on the duration ofthe limited liability company.)
3. The name and address of each person executing these articles of organization is as follows:
(State whether each person is executing these articles of organization in the capacity of a
member, organizer or both. Note: This document must be signed by all persons listed here).
Constance Olatidoye, member and organizer PO Box 3743 Wilmington, NC 28406
Babatunde Olatidoye, member PO Box 3743 Wilmington, NC 28406
4. The street address and county of the initial registered office of the limited liability company is:
Number and Street 1414 42nd Street
City, State, Zip Code Wilmington, NC 28403
County New Hanover
5. The mailing address, if different from the street address, of the initial registered office is:
PO Box 3743 Wilmington, NC 2a406
6. The name of the initial registered agent is: Constance Olatidoye
7. Principal office information: (Select either a or b)
a. 0 The limited liability company has a principal office.
The street address and county of the principal office of the limited liability company is:
Number and Street 1414 42nd Street
City, State, Zip Code Wilmington, NC 28403
County New Hanover
The mailing address, if different from the street address, of the principal office of the corporation is:
PO Box 3743 Wilmington, NC 28406
b. ❑ The limited liability company does not have a principal office.

8. Check one of the following:
X (i) Member -managed LLC: all members by virtue of their status as members shall be
managers of this limited liability company.
(ii) Manager -managed LLC: except as provided by N.C.G.S. Section 57C-3-20(a), the
members of this limited liability company shall not be managers by virtue of their status as
members.
9. Any other provisions which the limited liability company elects to include are attached.
10. These articles will be effective upon filing, unless a date and/or time is specified:
This is the 20 day of January 2009
Signature
Constance Olatidoye, member and organizer
Type or Print Name and Title
StgAnature
Babatunde Olatidoye, member
Type or Print Name and Title
NOTES:
I. Filing fee is S125. This document must be filed with the Secretary of State.
CORPORATIONS DIVISION P.O. Box 29622 RALEIGH, NC 27626-0622
(Revised January 2002) (Form L-01)

2t S'
�' N srarER qRoal�EstatepRour�Axclas OttteTs e 5. o o
gactm 1Ya,e, 'z i
Tar Lot No
Bihir '`AGE
RECDhDEJ.thD VERIFIED
g REBECrA P.-Dr.,R 1480 1 138
p RUMI-,-, ".
NEI. r
DEC 18 12 2s PII r89
Hook and Pate
...... Parcel Identifier No.by ......
arified by .. ... .. .._.. ... County on the . .. day of to
hLil after recording to .John. W. Anagnost-and..Wife, Kathleen .Jewell....
__._..... .3.Yt...D�r•.:4 .k G-rmc�_Or-. u.IM.N� zSs4o3
This instrument was peepamd by . ,W„ Allen Cobb, .Sr.. ...
Brief description for the Index
36 NORTH CAROLINA GENERAL WARRANTY DEED
THIS DEED made thiJ//y% day of December. , 19 89 , by and between
GRANTOR ' GRANTEE
WALTER F. JOHNSTON and wife,
14ARGARET S. JOHNSTON
JOHN W. ANAGNOST and wife,
KATHLEEN JEWELL
Enter In apprepriase pates rent sacs partr:..e. Wdmer. and. If appropriate, eeuwea. at county. ow orepetaue. or parleeres"
The designation Grantor and Grantee as used herein $hall include said parties, their heirs, successor., and smIgna, and
shall include singular, plural, masculine, feminine or neuter as required by context.
WITNESdged, that the Grantor, for a valuable t,bagainconsideration paid by the Grantee, the receipt f which ,i ii that aeknowledged, has and by these Presents does grant, bargain, sell and convey unto the Grantee In fee etmple; al� t)tat
certain lot or parcel of land situated in the City of _ . (ij,U
owdbip,
.New Hanover. .. County, North Carolina and more particularly described as follows; '
ATTACHED DESCRIPTION
MARKED "EXHIBIT A"
RMIRMED To 0/4_)
172367 dsq 4 fad "" "av
lee. y. w.w coin ro r m u.......... un.

B00 PAGE
1480 1139
The property bereioabove described wa. acquired by Grantor by instrument recorded in _. . .. .. .... .. .. ....
., Book 1306< Pdge 640
A map showing the above described properly is recorded iD Plat Back .. ., page..... . .
TO HAVE AND TO HOLD the aforesaid lot or parcel Of land and all privilege. and appurtenances thereto belonging to
the Grantee in fee simple.
And the Grantor covenants with the Grantee, that Grantor is seited Of the premises in fee simple, has the right to convey
the same in fee simple. that title is marketable and free and clear of all encumbrances, and that Grantor will svArrant and
defend the title against the lawful claims of all persons whomsoever except for the exceptions hereinafter stated.
Title to the properly hereinabove described is subject to the following esreplinns:
tN wrtn[as w..... x, 0. m.n<.. ... ev<umo aft nn Nne ... ...L era <vrpenu. nu u.«e m. . !H Y .. <I <w Y W
:iwr :rui<M< y na ew> <vne(heG eRlem <n< m Ku Y t..."an'. .m.m tr <.tn..u> er w e e <u m< e.> .va Y. ruu
-__.__..------------------------- ___ _ _
ICOrpv..lf N<n<1 .1 ' ' -
WAL ER F. O STON
by:
2
__.._.__.._. _..._._._................ cauW
---------------------------- — MAEtARET S. ZJONNSTON
At-rasx: 1
U
•e ... .. ... .. .. ... .I..ALI
- . — _N<.fYrr (C.Iw.Y a..11 y
s�
AQl% Neat" CAtouNA..— New_ Hanover-------C.vntY.
a'�rGAr�f�
. L a N.Yf) e.um .1 Y. cwew e.a BW. aer.me, anw m.: __._. __._..._.__.................___
�OTARy 9 ai ; .Walter Fc Johnston and wife,,-M- garet--S- Johnston._,_ ._ Dr..Yr,
epees n v<rY..ur w a eeYrf YI. /e�Y( q� .ne t ........ Ye .u<ou.n p1 I.A. 1 ...... mawmfm. wmYa mr
..... .Ymp er 1, UXyl__. a r 1 December .. - ....
n .�f :/_/.j/.._1...................
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/eAL-/LAMP NO.tfl CAROLINA........ ....... _...... ___ _ _Cvan,
L . N.11 Pvt1Y H ON Cev.tY ua .YY a-NAII. —1.1, N.t _____ __ __________________
9 p.wev.n> um. INNI, m. tth Y> A. utn.wl.Yea un se b ........................... /Kret<q al
................._____....._.__..-...._.___.__._..__ . N.". C<.alm <v.pauns. ma Y.t.Y ..ue.u>."
a .wm see u Yf ut ar u. e.r1«ub., Y. re.uay. Y--a"Ai pu Hrvfa 1 n...m. ey As ---...-_.
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NWm mY Nve .W M. a4mp sr .eq Wa _. _.e.Y .1 .. .. . p...._....
MYwmnlnlan rtHeea:--------------- ---- ......... .-------------------------------------- NHYY PANIA
ta! I....... c.vxAY< j =r. D Otary U e
<lNVlea Y N f.n! L .\Y Numevt .ve {p4 ..nuffk.Y a<! 1.1. «H.......t Ye .. v ..A I... <ne Iv Ina a..t ... P.a. a.. Ye
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Arcane
-- --- 1'_- __ (ICBR ________ _________ _ N_E_W_ H_A_N__0_V_E__R___________
t> - __nrpptY:ba�ly(/ppaeta"r of DOY
N.4 Y< aoK .arm Ne 1 e tale. R<rlu< 1.11.

800f ASF
1480 1140
E X H I B I T A
BEGINNING at an old concrete monument in the Northern line of
a dirt road (50 feet in width), said dirt road being created
by Indenture recorded in Book 424, Page 574 of the New Hanover
County Registry, said old concrete monument being located
South 50 degrees 12 minutes 30 seconds East 345.94 test as
measured Eastwardly along the Northern line of the above mention
ed dirt road from its point of intersection with the South-
eastern right of way line of a road having a width of 43.6 feet
said point of intersection also being the Southwest corner of
the John J. Malpass, Jr, tract as recorded in Book 1267, Page
1547 of the New Hanover County Registry; running thence, from
said Beginning point, along the centerline of a ditch and the
Eastern most line of the above mentioned John J. Malpass, Jr,
tract North 38 degrees 07 minutes East 153.50 feet to an old
concrete monument in said ditch at its intersection with
another ditch, said concrete monument being in the Southern
line of the Charles E. Lewis tract as recorded in Book 439, Page
376 of the New Hanover County Registry; running thence, with
the Southern line of the above mentioned Charles E. Lewis tract
and with the centerline of said other ditch South 74 degrees
22 minutes East 176.03 feet to a brass shaft inside an old pipe
at the high water line of the Masonboro Sound; running thence,
with the high water line of the Masonboro Sound as it meanders
in a Southeastwardly direction to a point that is located South
50 degrees 21 minutes East 135.07 feet, North 40 degrees 53
minutes East 25.95 feet, South 65 degrees 02 minutes East
66.64 feet, South 59 degrees 30 minutes East 252.88 feet and
South 59 degrees 30 minutes East 29 feet more or less from the
point of Beginning; running thence, North 59 degrees 30 minutes
West 29 feet more or less to an old granite stone in the
Northern line of the Dudley Malpass tract as recorded in Book
1145, Page 58 of the New Hanover County Registry; running
thence, with the Northern line of the above mentioned Dudley
Malpass tract, the same course continued North 59 degrees
30 minutes West 252.88 feet to an iron pipe; thence, continuing
with the Northern line of the above mentioned Dudley Malpass
tract North 65 degrees 02 minutes West 66.64 feet to an old
Pipe, said pipe being the Northwest corner of the above mention-
ed Dudley Malpass tract; running thence, with the Western line
of said Dudley Malpass tract South 40 degrees 53 minutes West
25.95 feet to an old pipe in the Northern line of the above
mentioned dirt road created by Indenture recorded in Book 424,
Page 574 of the New Hanover County Registry; running thence
with the Northern line of said dirt road North 50 degrees 21
minutes West 135.07 feet to the point of Beginning, containing
2.1 acres more or less.
The above described tract of land being the same lands as
described in that certain Deed dated 30 June 1955 from D.D.
Cameron and wife, Elizabeth H. Cameron to Walter F. Johnston
and wife, Margaret S. Johnston and Francis E. Newton and
wife, Miriam J. Newton and recorded in Book 571 at Page 226
of the New Hanover County Registry. Also being the same propert
described in that certain Deed from Miriam J. Newton to Walter
F. Johnston and wife, Margaret S. Johnston dated October, 1985
and recorded in Book 1306 at Page 640 of the New Hanover County
Registry.
TOGETHER WITH AND SUBJECT TO the rights and privileges of that
certain Deed of Easement and Agreement dated 1 February, 1988
and recorded in Book 1404 at Page 1069 of the New Hanover
County Registry.