SW8060557_COMPLIANCE_20070119

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
HOC DATE
YYYYMMDD

A�
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Coastal Management
Michael F. Easley, Governor Charles S. Jones, Director William G. Ross Jr., Secretary
January 19, 2007
MEMORANDUM:
TO: Linda Lewis
Stormwater
Division of Water Quality
FROM: Doug Huggett, Major Permits Coordinator
SUBJECT: CAMA Permit Application Review
b 05
Idti��2007
-. �I
Applicant: CJL Partners c/o Frank Majewski for Sawgrass Point S/D
Project Location: 800 block of N. New River Dr (NC Hwy 210), adjacent to Topsail -Sound,
in Surf City, Pender County
Proposed Project: to install a pier and platform, retaining wall, subdivide a parcel a�ndin�st2fll,
associated road and utilities;
Please indicate below your agency's position or viewpoint on the proposed project and return
this form by February 12, 2007. If you have any questions regarding the proposed project,
please contact Jon Giles at [phone], when appropriate, in-depth comments with
supporting data is requested.
REPLY: This agency has no objection to the project as proposed. /6) _3._ ZC?C�&.
This agency has no comment on the proposed project.
This agency approves of the project only if the recommended changes are
incorporated. See attached.
This agency objects to the project for reasons described in the attached
comments.
SIGNED iV �� DATE Z—f s-Cam
127 Cardinal Drive Ext., Wilmington, North Carolina 28405-3845
Phone: [phone] FAX: [phone] Internet: www.nccoastalmanagement.net
An Equal opportunity 1 Affirmative Action Employer - 50% Recycled 110% Post Consumer Paper

N
DIVISION OF COASTAL MANAGEMENT
FIELD INVESTIGATION REPORT
1. APPLICANT'S NAME: C.J.L. Partners % Prank Majewski -/ Sawgrass Point
2. LOCATION OF PROJECT SITE: The project site is located in the 800 Block of North New River Drive.(NC
Hwy 210), adjacent to Topsail Sound, in Surf City, Pender County.
Photo Index — 2006: 25-6581: K,L(14,15) 2000: 25-331: L,M,N(10,1 1) 1995: 25-315: M,N(21,22)
State Plane Coordinates — X: 2442234 Y: 252870 CPS File: P 122916A
Lat:34026'08.91891'N Long: 77°32'00,05651"W
3. INVESTIGATION TYPE: CAMA
4. INVESTIGATIVE PROCEDURE: Dates of Site Visit — 12-29-06
Was Applicant Present — No
5. PROCESSING PROCEDURE: Application Received — Complete on 01/04/07
Office — Wilmington
6. SITE DESCRIPTION:
(A) Local Land Use Plan -Town of Surf City
Classification From LUP — Developed
(A) AEC(s) Involved: OH & ES
CC Water Dependent: Yes
(D) Intended Use: Private / Commercial
(E) Wastewater Treatment: Existing — N/A
Planned - Municipal Sewer
(F) Type of Structures: Existing —N/A
Planned —Town homes, pier and dock, retaining wall, roadway and utilities.
(G) Estimated Annual Rate of Erosion: 2' / year Source — LTAASCR 1998 Update
7. HABITAT DESCRIPTION: 1AREA1
DREDGED I II.Lf:U c l l l I:
(A) Vegetated Wetlands
Shaded
1410 ft.'
(B) Non -Vegetated Wetlands - open water
200 ft.2
(incorporated)
(C) Other (Highground)
47,915 ft2
(disturbed)
(D) Total Area Disturbed: 49.525 ft'
(E) Primary Nursery Area: Yes .
(F) Water Classification: SA Open: Yes
8. PROJECT SUNEVIARY: The applicant is proposing to install a pier and platform, retaining pval1.
subdivide a parcel and install associated road and utilities.
127 Cardinal Drive Ext., Wilmington, North Carolina 28405-3845
Phone: [phone] FAX: [phone] Internet: www.nccoastalmanagement.net
An Equal Opportunity l Affirmative Action Employer — 50% Recycled 110% Post Consumer Paper

C.J.L. Partners % Frank Majewski / Sawgrass Point
Page Two
I
ip
9. PROJECT DESCRIPTION:
The project site is located in the 800 Block of North New River Drive (NC Hwy 210), adjacent to Stump Sound.
in Surf City, Pender County. To get to the site from Wilmington take US Hwy 17 N to NC Hwy 210. Turn right
onto NC Hwy 210 and continue to NC Hwy 50. Take a right onto NC Hkw 50. Travel across the swing bridge to,
NC Hwy 210. Take a right onto NC Hwy 210. Travel approximately one mile. The property is located on the
right just past Egret Landing Subdivision and the adjacent cleared lot. The property is adjacent to NC Hwy 210
on the east side and is adjacent to Stump Sound on the west. The property is adjacent to residential properties on
the north and south sides. The property is currently vacant and appears to be in a natural undisturbed state. The
current elevation of the property ranges from 3' to 5' above mean sea level (MSL) and the property
encompasses approximately 7.89 acres including approximately 1.1 acres of highground. The remainder of the
property is §404 Wetlands and coastal wetlands. The highground portion of the property is vegetated primarily
with Wax Myrtle (k1yrica cerifera), Live Oak (Quercus virginiana). Yaupon 1 ecd (c�larti
(Juniperus virginiana) and a dense understory. The project site has approximately 1.1 acres of hi�u112YOund (h,
remaining 6.79 acres is a combination of §404 Wetlands and coastal wetlands. The high marsh portion of the
coastal wetlands ranges from 230' to 180' in width and consist mainly of Cattail (Typha, spp.), Black
Needlerush (Juncus roemarianus), Sea Lavender (Limonium, spp.), Salt Meadow- Grass (Spartina patens). Salt
Marsh Cordgrass (Spartina alterniflora) and Glasswort (Sahcornia spp). The high marsh area transitions to lo%v
marsh that consists of mainly Salt Marsh Cordgrass and varies in width -from 10' to 60'. The normal hi�(lh %�Llk2¢-
(NHW) line is located along the transition from high marsh to low marsh.
c
The Town of Surf City Land Use Plan classifies the upland areas of this project as Developed. The x%atcrs ol' 0ic
project site are classified as SA by the NC Division of Water QualitV. -1 \C DIVIS1011
designated this area of Stump Sound,as a Primary Nursery Area; and the waters adjacent to the
project are open to the harvesting of shellfish.
PROPOSED PROJECT:
The applicant is proposing to construct 17 Town homes on the 1.1 acres of highground at a density of 16
units/acre. The applicant is also proposing to install a pool, and 12,622 ft.' of driveway and parking? area. The
access to the proposed development would be located on the northern side of the property. The applicant is
proposing to install 791 linear feet of retaining wall beginning at the NC Hwy 210 right-of-way on the southern
property line and continued in a westerly direction approximately 180'. Then the retaining wall would run 110111,
the §404 Wetland line in a northerly direction, the alignment of the proposed wall would match the tbotprints of
the town homes and proposed. pool area to the northern property line and then would turn east to the intersection
of NC Hwy 210 right-of-way. The applicant is planning to connect to the Town of Surf City water and sewer
services. There are two proposed swales and an infiltration bed located at the road between the town home units
and 10" roof drains, which would receive runoff from the 9 units located on -the estuarine side of the
development. These devices would route the runoff to a stormwater storage system measuring 150' in length
and 15' in width located on the northern property line.
The applicant is also proposing a 6' x 235' pier with a 10' x 20' T-head. The channel is approximately 40 in
width at the location of the proposed pier. The water depth at the end of the pier would be approximately -0.75'
@ Normal Low Water (NLW). There are no slips proposed with the pier and dock.
127 Cardinal Drive Ext., Wilmington, North Carolina 28405-3845
Phone: [phone] FAX: [phone] Internet: www.nccoastaimanagement.net
An Equal Opportunity 1 Affirmative Action Employer - 50% Recycled ti 10% Post Consumer Paper

I
C.J.L. Partners % Frank Majewski / Sawgrass Point
Page Three
10. ANTICIPATED IMPACTS
The proposed project would disturb approximately 47,915 ft.2 of highground located entirely in the High Hazard
Flood Area of Environmental Concern (AEC). The road installation would create approxitnatek, 47.91 ft.' of
impervious area located in the High Hazard Flood Area (AEC). The proposed pier would sli idc .tppru�in .tt•_ i�
1410 ft.z of coastal wetlands and the T-head would incorporate approximately 200 ft.' of estt.tarine v, atcrs 111d
public trust area.
Submitted by: J. W. Giles Date: January 10, 2007 Office: Wilmington
127 Cardinal Drive Ext., Wilmington, North Carolina 28405-3845
Phone: [phone] FAX: [phone] Internet: www.nccoastalmanagement.net
An Equai Opportunity.l Affirmative Action Empioyer — 50% Recycled 1 10% Post Consumer Paoer

RECEIVED
Stormwater Treatment & DCM WILMINGTON, NC DEC � s zoos
Erosion Control Narrative
Sawgrass Point
CJL Partners, Inc. proposes to build a residential townhome development on a 7.89 acre
tract located on NC 210 (New River Drive) close to its intersection with NC 501210 in Surf
City, N.C. (Topsail Township), Onslow County. The site is currently vacant. The proposed
development includes seventeen (17) townhome units, pool, and associated sitework. The
intended use of the project, when complete, is RESIDENTIAL.
The project is to be designed and constructed in accordance with NC Division of
Environmental Management Stormwater Management Rules (15A NCAC 2H.1000).
Section .1005(2)(b). The proposed project is "High Density" (i.e., percent impervious >
25%). Division of Water Quality requires that the first 1.5" of rainfall be treated in an
infiltration system.
The project site is located less than 1 mile from the Intracoastal Waterway (SA:HQW) in the
Cape Fear Basin. Existing site topography is gently sloping (0 -- 6%), draining towards the
rear (northwestern) portion of the site. Topography suggests that precipitation currently
infiltrates into the sandy soils or sheet flows into adjacent wetlands. Soils are Medium to
Coarse Sands (see attached soils evaluation) which have hydraulic conductivities ranging
from 10 — 20 in/hr.
In order to provide adequate cover over proposed stormwater infiltration facilities, it is
necessary to fill the upland portion of the project area to approximately Elevation 8.5. A
retaining wall is proposed upgradient of the 404 and coastal wetland delineations.
Retaining wall is to be of conventional design/construction (treated wood piles, vinyl panels).
No fills are proposed in wetland areas. Upon placement of fill, proposed grading activities
will be limited to installation of building pads and sloping parking areas as minimally required
for drainage. The site will be drained to one proposed infiltration system.
The developer plans to construct a wooden walk and dock (total .length 235') to provide
access to adjacent, existing canal. Dock will be of conventional design/construction (treated
wood piles, treated wood decking & railing).

Form DCM-MP- I RECEIVED
DCh1 WILiMINGTON, NC
APPLICATION
(To be completed by all applicants)
1. APPLICANT
a. Landowner:
Name C.r.L Partners, Inc. tr-,
Address 2828 Brenfield Dr. -
City Raleigh State NC
Zip 27606 Day Phone [phone]
Fax [phone]
b. Authorized Agent:
Name David K. Newsom (Crystal Coast Engineering, PA)
Address 3817-3 Freedom Wav
City Hubert
State NC
Zip 28539 Day Phone [phone]
Fax [phone]
c. Project name (if any) Sawgrass Point
NOTE: Permit will be issued in name of landowner(s), and/or
projecl name.
2. LOCATION OF PROPOSED
PROJECT
a. County Pender
b. City, town, community or landmark
Surf City, NC
c. Street address or secondary road number
NC Hwy 210 (N. New River Drive)
d. Is proposed work within city limits or planning
jurisdiction? X Yes No
e. Name of body of water nearest project (e.g. river,
creek, sound, bay) Topsail Sound 1 Adandc Intracoastal Waterway
3. DESCRIPTION AND PLANNED USE
OF PROPOSED PROJECT
a. List all development activities you propose (e.g.
building a home, motel, marina, bulkhead, pier, and
excavation and/or filling activities.
Propose grading of lot, construction of associated
roadways, parking, stormwater system, utility poles,
sewer system and public water system_ 0
I ?, 4c
i
b. Is the proposed activity maintenance of an existing
project, new work, or both? newwork
c. Will the project be for public, private or commercial
use? private (new residential homes)
d. Give a brief description of purpose, use, methods of
construction and daily operations of proposed
project. If more space is needed, please attach
additional pages. Heavy machinery will be used to
clear & grade the building lots, as well as the associated
infrastructure that includes. constructing drives/parking,
stormwater treatment system, sewer and water systems
and utility poles_
Revised 03/95

RECEIVED
DCM WILMINGTON, NC
Form DCM-MP-1
4. LAND AND WATER
CHARACTERISTICS
a. Size of entire tract 7.89 acres
b. Size of individual lot(s) see plans
c. Approximate elevation of tract above MHW or
N W L Existing-4.0 1 Proposed-9.0
d. Soil type(s) and textures) of tract
medium to coarse sand & coarse sand with shell; very friable to loose
e. Vegetation on tract Grass scrub, pine, small oaks
f. Man-made features now on tract none
g. What is the CAMA Land Use Plan land
classification of the site? (consult the local land use plan,)
Conservation Transitional
X Developed Community
Rural Other
h. How is the tract zoned by local government?
AIfu
Is the proposed project consistent with the applicable
zoning? X Yes No
(Attach zoning compliance certificate, if applicable)
Has a professional archaeological assessment been
done for the tract? Yes X No
if yes, by whom? NIA
k. Is the project located in a National Registered
Historic District or does it involve a National
Register listed or eligible property?
Yes X No
Are there wetlands on the site? X Yes No
Coastal (marsh) X Other
If yes, has a delineation been conducted? YES
(Attach dncumentation. if available)
D E C 0 8 2006
m. Describe existing wastewater treatment facilities.
None existing. Proposed sewer system will be public ('town
of Surf City), w/ maintenance agreement with developer (i.e.
developerihomeowners pay for maintenance.)
n. Describe location and type of discharges to waters
of the state. (For exam le, surface runoff, sanitary
wastewater, Industrial/commercial effluent, "wash
down" and residential discharges.) Stormwateronly;
collected & treated with infiltration system; discharged to wetlands
via vegetated filter in accordance with DWQ requirements.
o. Describe existing drinking water supply source.
None existing. Proposed water distribution system will
be supplied by Town of Surf City.
5. ADDITIONAL INFORMATION
In addition to the completed application form, the
following items must be submitted:
• A copy of the deed (with state application only) or
other instrument under which the applicant claims title
to the affected properties. If the applicant is not
claiming to be the owner of said property, then
forward a copy of the deed or other instrument under
which the owner claims title, plus written permission
from the owner to carry out the project.
• An accurate, dated work plat (including plan view
and cross -sectional drawings) drawn to scale in black
ink on an 8 1/2" by l I" white paper. (Refer to
Coastal Resources Commission Rule 7J.0203 for a
detailed description.)
Please note that original drawings are preferred and
only high quality copies will be accepted. Blue -line
prints or other,larger plats are acceptable only if an
adequate number of quality Copies are provided by
applicant. (Contact the U.S. Array Corps of
Engineers regarding that agency's use of larger
drawings.) A site or location map is a part of Plat
requirements and it must be sufficiently detailed to
guide agency personnel unfamiliar with the area to the
Revised 03/95

RECEIVED
DCM WILMINGTON, NC
Form DCM-MP-I
site. Include highway or secondary road (SR)
numbers, landmarks, and the like.
• A Stormwater Certification, if one is necessary
• A list of the names and complete addresses of the
adjacent waterfront (riparian) landowners and
signed return receipts as proof that such Owners
have received a copy of the application and plats
by certified mail. Such landowners must be advised
that they have 30 days in which to submit comments
on the proposed project to the Division of Coastal
Management. Upon signing,this form, the applicant
further certifies that such notice has been provided.
Name
Address
Phone
Name Mctr,s Gnc� L ,,�c,n5
Address
DEC 0 S 2006
6. CERTIFICATION AND PERMISSION
TO ENTER ON LAND
I understand that any permit issued in response to this
application will allow only the development described in
the application. The project will be subject to conditions
and restrictions contained in the permit.
I certify that to the best of my knowledge, the proposed
activity complies with the State of North Carolina's
approved Coastal Management Program and will be
conducted in a maaner'consistent with such program.
I certify that I am authorized to grant, and do in fact,
grant permission to representatives of state and federal
review agencies to enter on the aforementioned lands in
connection with evaluating in related to this
permit application and follow-up monitoring of the
project.
Phone
I further certify that the information provided in this
Name 1oft11r,QrzfS "�'l�lty application is truthful to the best of my knowledge.
Address �,r�r Gu;�ncl l�ri� mac sat��.I1F}'�L45H0
Phone -f i Liv —�-,(`C'
• A list of previous state or federal permits issued for
work on the project tract. Include permit numbers,
permittee, and issuing dates.
NCDENR Erosion6edimentation Control permit issued 7/13106 to CJL Partners,
Inc. (Project ID Pende-2006-425). Others pending (see attached)
A check for $250 made payable to the Department of
Environment, Health, and Natural Resources
(DEHNR) to cover the costs of processing the
application.
• A signed AEC hazard notice for projects in
oceanfront and inlet areas.
A statement of compliance with the N.C.
Environmental Policy.Act (N.C.G.S. 113A - I to
10) If the project involves the expenditure of public
funds or use of public lands, attach a -statement
documenting compliance with the North, Carolina
Environmental Policy Act.
This is the15� day of (� PT.
Please indicate attachments pertaining to your proposed
project.
DCM MP-2 Excavation and Fill Information
DCM MP-3 Upland Development
DCM MP-4 Structures Information.
DCM MP-5 Bridges and Culverts
DCM MP-6 Marina Development
NOTE. Please sign and date each attachment in the
space provided at the bottom of each form.
Revised 03195

Form DCM-MP-3
UPLAND
DEVELOPMENT
(Construction and/or land disturbing activities)
Attach this form to Joint Application for CAMA. Major
Permit, Form DCM-MP-1. Be sure to complete all
other sections of the Joint Application that relate to this
proposed project.
a. Type and number of buildings, facilities, units or
structures proposed 17Residential Townhcmeunits and
associated parking, dock, stormwacer treatmont system, water & sewer systems.'
b_ Number of lots or parcels 17 units.
c. Density (give the number of residential units'aad the
units per acre) 17 units; approx. 2 units/acre.
(approx. l6 units/acre if 404 Wetlands area excluded)
d- Size of area to be graded, filled or disturbed
including roads, ditches, etc. 1.1 acre
If the proposed project will disturb more than one
acre of land, the Division of Land Resources must
receive an erosion and sedimentation control plan at
least 30 days before land disturbing activity begins.
If applicable, has a sedimentation and erosion
control plan been submitted to the Division of Land
Resources? x Yes No
-If yes, date submitted permit issued on 7/13/06
f. List the materials (such as marl, paver stone,
asphalt, or concrete) to be used for paved surfaces.
1.5" SF 4.5 Asphalt; 6" ABC stone base
1 lV — i ad, S-.
g. Give the percentage of the tract within 75 feet of
MEW or NWL, or within 575 feet in the case of an
Outstanding Resource Water, to be covered by
impervious and/or built -upon surfaces, such as
pavement, buildings, rooftops, or to be used for
vehicular driveways or parking. 0%(only wood walk/deck)
RECEIVED
DCM ljkllLMINGTOK MC
JAN 4 4 2007
h. Projects that require a CAMA Major Development
Permit may also require a Stormwater Certification.
Has a site development plan been submitted to the
Division of Environmental Management for review?
x Yes No
If yes, date submitted approx, July 25, 2006
Describe proposed method of sewage disposal.
Connect to public Sewer system (Town of Surf City);
8" D.I. gravity sewer Lines.
Have the facilities described in Item i. above
received state or local approval? pending DWQ Sw=—w
(Attach appropriate documentation) ri �r �{ 1 SS't1 Cc� I C4.31 U4a
Describe location and type of proposed discharges to
waters of the state (for example, surface runoff;
sanitary wastewater, industrial /commercial effluent,
"wash down" and residential discharges).
Storrnwater collected & treated in infiltration system &
discharged to wetlands via vegetated filter in
accordance with DWQ requirements.
I. Describe proposed drinking. water supply source
(e.g. well, community, public system, etc.)
Connect to public water distribution systems (Surf City)
m. Will water be impounded? Yes X No
If yes, how many acres?
n. If the project is a oceanfront development, when
was the lot(s) platted and recorded? NIA
C.J.L. Partners, Inc. (Sawgrass Point)
Applicant :ii: !I
E
Revised 03/95

"I
Form DCM-MP-4
STRUCTURES
(Construction within Public Trust Areas)
Attach this form to Joint Application for CAMA Major
Permit, Form DCM-MP-1. Be sure to complete all
other sections of the Joint Application which relate to
this proposed project.
a. Dock(s) and/or Pier(s)
(1) _ Commercial Community X Private
(2) Number I
(3) Length 235 ft
(4) Width 6 ft
(5) Finger Piers Yes X No
(1) Number
(ii) Length
(ill) Width
(6) Platform(s) X Yes No
(i) Number I
(ii) Length 20 tc
(iii) Width 4-f- i D
(7) Number of slips proposed 0
(8) Proximity of structure to adjacent riparian
property lines 59 ft
(9) Width of water body 3
(IO)Water depth at water -ward end of pier at
ML W or N \VL, -*77- 1. 7 5" ` r/-
b. Boathouse (including covered lifts) Ik
(1) Commercial Private
(2) Length
(3) Width
c. Groin (e.g. wood; sheetpile, etc.) fV! i4-
(1) Number
(2) Length(s)
d. Breakwater (e.g. wood, sheetpile, etc.)
(1) Length
(2) Average distance from MHW, NWL or
wetlands
(3) Maximum distance beyond MHW, NWL or
wetlands
RECEIVED
DCM WILMING i ON. NC
{,3Fc 0 S 200E
Mooring buoys 04
(1) Commercial Community _ Private
(2) Number
(3) Description of buoy
(Color, inscription, size, anchor, etc.)
(4) Width of water body
(5) Distance buoy(s) to be placed beyond
shoreline
Mooring structure (boatlift, mooring pilings, etc.) /)IA-
(1) —Commercial _Community —Private
(2) Number
(3) Length
(4) Width
g. Other (ci e complete description)
79 �.S�� t iCf�sc j2��Gi r1rf?�i ti %�i l ll
C.J.L. Partners, Inc. (Sawgrass Poi
Signature
Date
Revised 03195

Front Elo-vation
L'
NOTE-6
i� d�� "drQc �F L7c�r'LIrY - �Ti;-�rZ
—u7l /- T- = Zo, <- LtD r
Crystal Coast Engineering, P.A.
Civil and Environmental Consulting Engineers
David K. Newsom, PE
3817-3 FREEDOM WAY, HUBERT, N.C. '28539
PHONE: [phone] FAX: [phone]
I
FRONT BUILDING ELEVATION SUPPLEMENT
PREPARED FOR
SAWGRASS POINT
Topsail Township - Pender County
SCALE; NO SCALE REV:
DATE: JANUARY 10, 2007
PROJECT: 05-027
DRAWN BY: BA/DKN SHEEP SUPPLEMENT

INFILTRATION TRENCH ANALYSIS
Filename: S:1WQS11NTRENCH1060557.ju106
Project # SWE
Project Name
Recvng Stream
Drainage Basin
Site Area
0 5
Sawgrass Point ' .
C:F .2
Impervious Area Calculation
Volume/Storage Calculation
acres
If Rational Method is used, place a 1 in this box 0 Cc= 0.85
Required
Design Storms in
RV 0.79
Volume to Store 35fiS CF
Provided
Pipe Diameter
Length Of a Single run of Pipe
Number of Pipe Runs in Trench
Storage In Piping
Total Storage in Piping
Cross -Sectional Area Of Pipe Runs
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume, 40%
Total Voids Volume
Total Volume Provided
Bottom Elevation
SHWT Elevation
Overflow Elevation
V �WIOHQ n1 CQ QluCwlllUcl Vlll%O
Pibe Size 1 Pipe Size 2
2.5 Feet
Feet;:..: :::.:_:.::<
......5: :.: each
Cubic Feet
Cubic Feet
24.544 0.000 SF
34.50
:......... 7 13:
... ...... :...... Ia
Exfiltration Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area of Sidewinder Units
Drawdown Time
25 YEAR 24 HOUR STORM N/A
Intensity, i = .33 inches / hour
Qr=CiA=
Op through the bottom of the basin=
10 YEAR 10 MIN HIGH INTENSITY EVENT
Intensity, i = 6.3 inches / hour
Volume for 10 yr. 10 min. event =
0.23 CFS
0.0263 CFS
2691.19 CF <
Feet
Feet
Feet
SF
CF
CF
Cubic Feet
Mean Sea Level
Mean Sea Level
Mean Sea Level
Q 667: Cubic Feet Per Hour Per Sq Ft
142.0 Square Feet
37.65 hours
Must be > Qr
3755 CF

Design Calculations
Infiltration System
for
Sawgrass Point
December 12, 2005
(Revised 5/31/06)
I. Project Description
The project consists of construction of residential condominiums and associated sitework on a 7.89 acre
tract located on N.C. Hwy. 210 in Surf City near its intersection with Shell Drive.
2. Design Requirements
Project will be designed in accordance with NC Administrative Code Section 15A NCAC 2H.1000 —
Stormwater Management (hereinafter "Regulations". Due to density, the project is considered "high
density development". Runoff in excess of the design volume must flow overland through a vegetative
filter.
3. Impervious Surface Areas
On -site Buildings
On -site Streets
On -site Parking
On -site Sidewalk
Reserve for Future
Total
Drainage Area
Percent Impervious
4. Design Volume
= 29,683 sf / 36,332 sf
= 81.70 %
16,068 sf
12,622 sf
993 sf
5 E P Q 5 2006
0 sf
SfN�GYpO���-
29,683 sf
36,332 sf
In accordance with Section. 1008(c)(1), the required design volume is computed as follows:
Using Schuler "Simple Method":
Rv — 0.05 + 0.009(l) where I = Percent Impervious (81.70%)
= 0,78530 in/in
Design Volume = Design Rainfall (1.5") x Rv x Drainage Area
= 1.5" x 0.78530 x 36,332 sf
= 42,798 in-sf or 3,567 cf
5. Storage Volume
The "Storage Area" is sized accommodate the Design Volume in a series of 30" HDPE pipes:

30" HDPE Manifold 15 If @ 4.906 cf/If 73 cf
30" HDPE Pipe 750 If @ 4.906 cf/lf 3,680 cf
Total Storage Volume 3,753 cf
6. Infiltration Area
Infiltration area is sized to accommodate actual storage volume (3,753 cf) pumped down in 2.0 days.
Required infiltration rate (and associated stormwater pumping rate) is computed as follows:
Infiltration (Pump) Rate = 3,753 cf / (2.0 day x 24 hr/day)
= 78.19 ct hr (9.75 gpm)
Stormwater Pump Station shall be designed and adjusted to deliver approximately 10 gpm to the infiltration
system which is sited upland from the Storage Area in order to comply with required separations from
SHWT.
The Soil and Sue Evaluation Report (copy attached) indicates that existing soils are clean, well graded,
coarse to medium sands with hydraulic conductivities ranging from 10-20 in/hr. Assuming conservatively
that existing soils have a minimum hydraulic conductivity of 8.0 in/hr, required infiltration area is
computed as follows:
Req'd Infiltration Area = 78.19 cflhr 1 (8.0 indtr / 12 in/ft)
= 117.28 sf
Use eight (8) standard "Infiltrator" units which will provide 142 sf of surface area.

Design Calculations
Stormwater Pump Station
for
Sawgrass Point
located in
Surf City, North Carolina
1. Project Description
CA
.C,Q�4F�' •b��C 9
,i 5 AL
it 148
P.
rOi�, n, �tNG��.•0���� i
K. NLV r
The stormwater treatment system serving Sawgrass Point will require a small pumping system to deliver
stormwater from the storage area to the infiltration bed.
2. Pipe Effective Lengths
2" Pump Station Piping
Actual Length = 8
No.
Fitting Type
LID
L
Total
1
gate valve
35
5.8
5.8
1
check valve
135
22.5
22.5
2
90 bend
20
3.3
6_6
FittingNalve Length —
34.9
2" Forcemain Pipe
Total Effective Length = 42.9'
Actual Length = 348'
No. Fitting Type LID L
Total
2 90 degree bend 20 3.3
6.6
0 45 degree bend 10 1.7
0.0
0 22.5 degree bend 5 0.8
0_0
FittingNalve Length
6.6
Total Effective Length = 354.6'
3. Pump Selection & Operating Conditions
Pump Selection — Myers S33
Operating Conditions: 26 GPM @ I TDH — See attached spreadsheet
Throttle pump in field to deliver 10.0 gpm.

Forcemain/Pump System Model
Enter data in shaded areas.
Project:
By:
Date:
Pump Off Elevation
Forcemaln High Point:
Forcemain Discharge Elevation:
Pipe
Section
Pipe
Material
C
Diameter
1(inches)
Actual Equiv. Effective
I Length Length Length
Section 1
Section 2
SSection 3
ection 4
........
.::.
sy�y
v>
='
r,
.......
�
yy.
42.9
354.E
F'lo
Flow Rate Interval:
Head loss calculated using Hazen -Williams e
H, _ .2083(100/C) "'(Q 1.B5ro48555)
where: Hf - friction loss in ft/100
0 - Row in gpm
D - diameter in inches
Pump Rate
(gpm)
Section 1
Hf Velocity
Section 2
Hf Velocity
Section 3
Hf Velocity
Section 4
Hf Velocity
Total
Friction Loss
0
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2
0.01
0.20
0.07
0.20
0.00
0.82
0.00
0.82
0.07
4
0.03
0.41
0.24
0.41
0.00
1.63
0.00
1.63
0.26
6
0,06
0.61
0.50
0.61
0.00
2.45
0.00
2.45
0.56
8
0.10
0.82
0.85
0.82
0.00
3.27
0.00
3.27
0.95
10
0.15
1.02
1,28
1.02
0.00
4,09
0.00
4.09
1.44
12
0.22
1.23
1.79
1.23
0.00
4.90
0.00
4.90
2.01
14
0.29
1.43
2.39
1.43
0.00
5.72
0,00
5.72
2.67
16
0.37
1.53
3.05
1.63
0.00
6.54
0.00
6.54
3.42
18
0.46
1.84
3.80
1.84
0.00
7.36
0.00
7.36
4.26
20
0.56
2,04
4.62
2.04
0,00
8.17
0,00
8.17
5.17
22
0.67
2.25
5.51
2.25
0.00
8.99
0.00
8.99
6.17
24
0.78
2A5
6.47
2.45
0.00
9.81
0.00
9.81
7.25
26
0.91
2.66
7.50
2.66
0.00
10.63
0.00
10.03
8.41
28
1.04
2.86
8.60
2.86
0.00
11.44
0.00
11.44
9.64
30
1.18
3.07
9.77
3.07
0,00
12.26
0.00
12.26
10.95
32
1.33
3.27
11.01
3.27
0.00
13.08
0.00
13.08
12.34
34
1.49
3.47
12.32
3.47
0.00
13.90
0.00
13.90
13.81
36
1.66
3.68
13.69
3.68
O.DO
14.71
0.00
14.71
15.35

equation:
Static
Bead
TDH
(ft)
3.50
3.50
3.50
3.57
3.50
3.76
3.50
4.06
3.50
4.45
3.50
4.94
3.50
5.51
3.50
6.17
3.50
6.92
3.50
7.76
3.50
8.67
3.50
9.67
3.50
10.75
3.50
11.91
3.50
13.14
3.50
14.45
3.50
15.84
3.50
17.31
3.50
18.85

SYSTEM CURVE
VS.
PUMP CURVE
35.00
30.00
25.00
0 20.00
15.00
10.00
5.00;�
0.00
0 4 8 12 16 20 24 28 32 36 40 44 48
PUMP RATE (GPM)
TDH (f#) PUMP