SW8081222_APPLICATION_20111207

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 0� 1222
DOC TYPE
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
Z02201020
YYYYMMDD

Permit
(to be provided by DWQ)
of wATFH
NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM o
401 CERTIFICATION APPLICATION FORM
SAND FILTER SUPPLEMENT
This form must be filled out on line, printed and submitted with all of the required information.
Make sure to also fill out and submit the Required Items Checklist (Section III) and the I&M Agreement (Section IV)
Project name
Contact name
Phone number
Date
Drainage area number
Paul R. Shivers, P.E.
[phone]
10/10/08; rev 1215/08; rev 11/9/11 (permit modification)
1
Drainage area AD)
5,856.00 1? OK
Impervious area
3,675.00 112
% Impervious (IA)
62.8% %
Design rainfall depth (Rg)
1.50 in
Peak Flow Calculations
1-yr, 24-hr runoff depth
3.80 in
1-yr, 24-hr intensity
0.16 inlhr
Pre -development 1-yr, 24-hr runoff
0.28 ft'Isec
Post -development i-yr, 24-hr runoff
0.58 ft'Isec
PrelPost 1-yr, 24-hr peak control
0.30 ft /sec
Storage Volume
Design volume (WOV)
299.95 ft'
Adjusted water quality volume (WOVAd,)
224.96 ff'
Volume contained in the sedimentation basin and on lap of the sand filter
OK
455.00 fit'
Top of sand filter/grate elevation
8 it amsl
Weir elevation (between chambers)
5.67 It amsl
Maximum head on the sedimentation basin and sand filter (hMa,F;uer)
1.58 it Insufficient depth.
Average head on the sedimentation basin and sand filter (h,)
0.79 It OK
Runoff Coefficient (Rv)
0,61 (unitless)
Type of Sand Filter
Open sand filter?
SHWT elevation
Bottom of the sand filter elevation
Clearance (dsnwr)
Closed/pre-cast sand filter?
SHWT elevation
Bottom of the sand filter elevation
Clearance (dsewr)
If this is a closed, underground closed sand filter: The clearance between
the surface of the sand filter and the bottom of the roof of the underground
structure (dso,r,)
YorN
It amsl
It amsl
Y YorN
5.50 It amsl
1.58 it amsl
-3.92
1.58 it
I2ECF'I VEU
DEC 0 7 2n
BY:___
Form SW401-Sand Filter-Rev.5 2009SeptW Parts I and 11. Project Design Summery, Page 1 of 2

Permit Number:
.,
ffo be provided by DWQJ
Sedimentation Basin
Surface area of sedimentation basin (As)
144.00 1?
OK.
Meets minimum, but may need to be increased to
Sedimentation basinlchamber depth
3.00 ft
Sand Filter
Surface area of sand filter (AF)
144.00 ft'
OK.
Meets minimum, but may need to be increased to
Top of sand media filter bed elevation
5.67 it amsl
Bottom of sand media filter bed/drain elevation
3.25 ft amsl
Depth of the sand media filter bed (dF)
2.42 ft
Coefficient of permeability for the sand filter (k)
3.50 (fVday)
Outlet diameter
12.00 in
Outlet dischargelfiowrate
12.67 ft'/sec
Time to drain the sand filter (t)
40,00 hours
OK.
Submit drainage calculations.
Time to drain the sand filter (t)
1.67 days
Additional Information
Does volume in excess of the design volume bypass the sand filler?
Y
Y or N
OK
Is an off-line flow -splitting device used?
Y
Y or N
OK
If draining to SA waters: Does volume in excess of the design volume flaw
N
Y or N
Excess volume must pass through filter.
evenly distributed through a vegetated filter?
What is the length of the vegetated filter?
NIA It
Does the design use a level spreader to evenly distribute flow?
Y
Y or N
OK
Is the BMP located at least 3011 from surface waters (50ft if SA waters)?
Y
Y or N
OK
If not a closed bottom, is BMP located at least 100ft from water supply wells?
Y
Y or N
OK
Are the vegetated side slopes equal to or less than 3:1
Y
Y or N
OK
Is the BMP located in a recorded drainage easement with a recorded access
Y
Y or N
OK
easement to a public Right of Way (ROW)?
What is the width of the sedimentation chamberlforebay (Wsd)?
4.00It
OK
What is the depth of sand over the outlet pipe (dpipe)?
2.42 It
OK
fZECEIVEl ll
DEC 0 7 2011
BY!
Form SW401-Sand Filter-Rev.5 2009Ser r17 Pads I and 11. Project Design Summary, Page 2 of 2

Permit No.
(to be provided by DWQ)
mease moicate me page or pian sneet numoers wnere me supporting aocumentatlon can De iouna. An Incomplete suDmitial
package will result in a request for additional information. This will delay final review and approval of the project. Initial
in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent,
the agent may initial below. If a requirement has not been met, attach justification.
Initials Page/ Plan
Sheet No.
PRS C' I. Z 1. Plans (1"- 50' or larger) of the entire site with labeled drainage area boundaries
- System dimensions (length, width, and depth) for both the sedimentation chamber and the filter
chamber,
- Maintenance access,
- Flow splitting device,
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable), and
c, 12. • Boundaries of drainage easement.
PAS
2. Plan details (1' = 30' or larger) for the sand filter showing:
- System dimensions (length, width, and depth) for both the sedimentation chamber and the filter
chamber,
- Maintenance access, PA�'J 101:dW'y
- Flow splitting device, ioti-VA-1 001'41."
- Vegetative filter strip dimensions and slope (if SA waters),, %& C. wifi/s)
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable), and
• Boundaries of drainage easement. fe-em+y O.—�� .1
4 (ty G_I • ' 3. Section view of the sand filter (1" = 20' or larger) showing:
- Depth(s) of the sedimentation chamber and sand filter chamber,
Depth of sand filter media,
Connection between the sedimentation chamber and the sand filter chamber and weir elevation,
SHWT elevation,
Outlet pipe, and
Clearance from the surface of the sand filter to the bottom of the roof of the underground structure (if
jf;"i, 5 ° applicable).
PQS 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information.
5. Supporting calculations (including drainage calculations)
P� ,SIt'l 0.0 6. Signed and notarized operation and maintenance (0&M) agreement
7. A copy of the deed restrictions (if required).
RECEIVED
DEC 0 7 2011
BY:
Form SW401-Sand Filter-Rev.5 2009Sept17 Part III, Page 1 of 1

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��f III �I

State Stormwater Management Systems
/ Permit No. SW8 081222
Pump Station 35 Expansion
Stormwater Permit No. SW8 081222
New Hanover Countv
Designer's Certification -(e, ter-"i N° S W g
I, PQui R S1,).VC0,J , as a duly registered m-,$S.., in the
State of North Carolina, having been authorized to observe (periodically eekl full
time) the construction of the project,
for (,,pry Feet., tU61. f }:I;}„ A.r4 iti j (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:
Cq
�,`,``�� S'Ro�2
Signature !'n.%�i1,�_ 03A�236
/a3/tt
Registration Number 0 3 02 3 L
Date 2�t3 / rz ','••,,'�R
�[E(CE0VE
FEB 2 7 2012
BY:�_
Page 7 of 8

1.1os
�I•oL=i2.N.•� '=v�N�ech.

State Stormwater Management Systems
Permit No. SW8 081222
Certification Requirements:
P k5 1. The drainage area to the system contains approximately the permitted
acreage.
A5 2. The drainage area to the system contains no more than the permitted
amount of built -upon area.
i0-s 3.✓ All the built -upon area associated with the project is graded such that the
runoff drains to the system.
P �S 4.✓ All roof drains are located such that the runoff is directed into the system.
/�S_5. ✓ The bypass structure elevations are per the approved plan.
LtLS 6. ✓ The bypass structure is located per the approved plans.
IC S 7.✓ A Trash Rack is provided on the outlet/bypass structure. Sq„ J-9he. G.',Kf• s
PKS 8 All slopes are grassed with permanent vegetation.
W 9. `' Vegetated slopes are no steeper than 3:1.
KS 10.`/ The inlets are located per the approved plans and do not cause short-
circuiting of the system.
?A,S 11.1,/ The permitted amounts of surface area and/or volume have been
provided.
12.v/ All required design depths are provided.
r �S 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
New Hanover County Building Inspections
Page 8 of 8

l � '

High Density Commercial Subdivisions
Deed Restrictions & Protective Convenances
In accordance with Title 15 NCAC 2H.1000 and S.L. 2006-246, the Management Regulations, deed
restrictions and protective covenants are required for High Density Commercial Subdivisions where
lots will be subdivided and sold and runoff will be treated in an engineered stormwater control facility.
Deed restrictions and protective covenants are necessary to ensure that the development maintains a
built -upon area consistent with the design criteria used to size the stormwater control facility.
1 Matthew W. Jordan , acknowledge, affirm and agree by my signature below, that
I will cause the following deed restrictions and covenants to be recorded prior to the sale of any lot
within the project known as Pump Station 35 Expansion
1. The following covenants are intended to ensure ongoing compliance with State Stormwater
Management Permit Number SW8 081222 as issued by the Division of Water Quality
under the Stormwater Management Regulations.
2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to
maintain compliance with the stormwater management permit.
3. These covenants are to run with the land and be binding on all persons and parties claiming
under them.
4. The covenants pertaining to stormwater may not be altered or rescinded without the express
written consent of the State of North Carolina, Division of Water Quality.
5. Alteration of the drainage as shown on the approved plan may not take place without the
concurrence of the Division of Water Quality.
6. The maximum allowable built -upon area per lot is square feet.
*Note: If the BUA per lot varies, please substitute the following statement for the one above and
provide a complete listing of the proposed BUA for each lot:
The maximum built -upon area per lot, in square feet, is as listed below:
Lot # BUA Lot # BUA Lot # BUA Lot # BUA
1 10,049
This allotted amount includes any built -upon area constructed within the lot property boundaries,
and that portion of the right-of-way between the front lot line and the edge of the pavement. Built
upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate,
coquina and parking areas, but does not include raised, open wood decking, or the water
surface of swimming pools.
All runoff from the built -upon areas on the lot must drain into the permitted system. This may be
accomplished through a variety of means including roof drain gutters which drain to the street,
grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff
and directing them into a component of the stormwater collection system. Lots that will naturally
drain into the system are not required to provide these additional measures.
8. The owner of each lot, whose ownership is not retained by the permittee, is required to submit a
separate stormwater permit application to the Division of Water Quality and receive a permit
prior to construction.
9. The project and each lot will maintain a 30** foot wide vegetated buffer between all impervious
areas and surface waters.
**50 foot for projects located in the 20 coastal counties. [kne1�' VE+ li
DEC 0 7 2011
Form DRPC-1 Rev.2 05Nov2009 Page I of 2

High Density Commercial Subdivisions
Si
I, ygDd ►'POD --I M . V9r,�n a Notary Public in the
State of NorfA Caro II;no- County of A/w iNawUNe-
do hereby certify that M j4_,]YjOCr,J w • SOrO(OLA personally appeared
before me this the � day of /VoV e n�E/' 201( and acknowledge
the due execution of the foregoing instrument. Witness my hand and official seal,
fi)nC e- ,A avda ti
Signature
My Commission expires
Form DRPC-1 Rev.2 05Nov2009 Page 2 of 2
SEAL
113 LY
.1E;L 7 ZO»