20061554 Ver 1_Wetland Delineation_20080124

LAND DEVELOPMENT SERVICES
To: Annette Lucas
Company: NCDENR 4010versight/Express
Address: 2321 Crabtree Blvd, Ste 250
Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
® For Review and Comment ~1 For Approval ~ As Requested ^ For your file
Copies Date No. Description
1 01.23.08 1 Water Quality BMP Plans
1 01.23.08 2 Stormwater Qualtiy and Detention Calculations
1 01.23.08 3 NCDENR Wet Detention Basin Supplement (I., II., III.)
1 01.23.08 4 High Density Commercial Subdivision Deed Restriction& Protective Covenants
1 01.23.08 5 Wet Detention Basin Inspection and Maintenance Agreement
~C~MiETS:
Ms. Lucas,
Attached are the SMP, Calculations and paperwork for the DEB 44 Ac. NW Corner 401,
NCDENR Project # 06-1554 for your review.
Regards,
Jeremia S. Murphy, P.E.
oc~- iss~{
o ~C~GD~~ D
JAN ~. 4 2.008
DENR -`AIP;t~~,jA?Ek f3RAN~
y~~pNDS AND ~
From:
Project
Name:
Project No.:
Date:
Jeremia S. Murphy, P.E.
DEB 44 Ac NW Corner (DWQ06-1554)
071021.000
01.23.2008
Re: SMP/BMP PLAN
Cc: File, client

Permit No.
(to be provided by DWQ)
~~
• o~oF w a rF9Qc
NCDENR
O Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111J must be printed, filled out and submitted along with all of the required information.
L PROJECT INFORMATION
Protect name DEB 44 Acre NW Comer (DWQ Project # 06-1554)
Contact person David F. Reese, P.E.
Phone number [phone]
Date 22,1an-08
Drainage area number 1
II. DESIGN 1NFflRA~ATION
Site Characteristics -~
Drainage area 1,655,280 ft
Impervious area 1,489,752 ft2
impervious 90 %
Design rainfall depth 1.0 in
Storage Volume: Non-SR Waters
Minimum volume required 118,628 ft3
Volume provided 120,818 .ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff .ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
Is pre/post control of the 1-yr 24-hr peak flow required? Y (Y or N)
1-yr, 24-hr rainfall depth 2.9 in
Rational C, pre-development 0.3 (unitless)
Rational C, post-development 0.9 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 0.1 in/hr
Pre-development 1-yr, 24-hr peak flow 7.7 ft3/sec
Post-development 1-yr, 24-hr peak flow 121.7 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 113.9 ft3/sec
Basin Elevations
Basin bottom elevation 653.00 ft
Sediment cleanout elevation 654.00 ft
Bottom of shelf elevation 658.00 ft
Permanent pool elevation 658.50 ft
Top of shelf elevation 659:00 ft
Temporary pool elevation 660.55 ft
Volume and Surface Area Calculations
SA/DA ratio 3.10 (unitless)
Surface area at the bottom of shelf 44530.00 ftz
Volume at the bottom of shelf 156445.00 ft3
Permanent pool, surface area required 46;280 ftZ
Permanent pool, surface area provided 4$,973 ft OK
Permanent pool volume 179,530 ft3
Average depth for SA/DA tables 3.665897535 ft OK
Surface area at the top of shelf 53572 {~
Volume at the top of shelf 205766 ft3
Form SW401-Wet Detention Basin-Rev.3 Parts I. 8 11. Design Summary, Page 1 of 2

Permit No
(to be provided by DWQJ
,11...RESIGN =tAtFLlit~lAT1~N ~?
Forebay volume 34;219 ft'
Forebay % of permanent pool volume 19 % OK
Temporary pool, surface area provided :58,426 {~
Drawdown Calculations
Treatment volume drawdown time 2 days OK
Treatment volume discharge rate 0.99 ft3/s
Pre-development 1-yr, 24-hr discharge 7.71 ft3/s OK
Post-development 1-yr, 24-hr discharge 1.74 ft3/s OK
Additional Information
Diameter of orifice 6.00 in
Design TSS removal 85 %
Basin side slopes 3 :1 OK
Vegetated shelf slope 10 :1 OK
Vegetated shelf width 10 ft QK
Length of flowpath to width ratio 3 :1 0K
Length to width ratio 2 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 1 ft OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? Y (Y or N) OK
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies DIP w/ Valve
Fonn SW401-Wet Detention Basin-Rev.3 Parts I. & II. Design Summary, Page 2 of 2

Permit No.
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST.. ~
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal 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.
Pagel Plan
Initials Sheet No.
~_ C200 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretreatment system,
-High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
s~~ C300 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
-Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
C301 3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
-Pretreatment and treatment areas, and
- Inlet and outlet structures.
C300 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
CALC'S 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for Forebay,
to verify volume provided.
C300 6. An assurance that the installed system will meet design specifications upon initial operation once the

C300 project is complete and the entire drainage area is stabilized.
7
A
.
construction sequence that shows how the wet detention basin will be protected from sediment until the
1
vs~ entire drainage area is stabilized.
INCLUDED 8. The supporting calculations.
JSN~ INCLUDED 9
. A copy of the signed and notarized inspection and maintenance (I&M) agreement..
S1~
~1 INCLUDED 10. A copy of the deed restriction.
Form SW401-Wet Detention Basin-Rev.1 Part III. Required Items Checklist, Page 1 of 1

High Density Commercial Subdivisions
Deed Restrictions & Protective Covenances
In accordance with Title 15 NCAC 2H.1000, 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 abuilt-
upon area consistent with the design criteria used to size the stormwater control facility.
I, K~til~~ •t'~ L. ~ Pn p S'~' ,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 jZ~ y 4 p,~~,~• uW '~~~ Q,
2.
3.
4.
5.
6.
7.
8.
The following covenants are intended to ensure ongoing compliance with State stormwater
Management Permit Number p~ - ~ 5 5 ~ , as issued by the Division of Water Quality
under NCAC 2H.1000.
The State of North Carolina is made a beneficiary of these covenants to the extent necessary to
maintain compliance with the stormwater management permit.
These covenants are to run with the land and be binding on all persons and parties claiming
under them.
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.
Alteration of the drainage as shown on the approved plan may not take place without the
concurrence of the Division of Water Quality.
The maximum allowable built-upon area per lot is I 8 7 5asquare feet. {OR, if the
proposed built-upon area per lot will vary, please use the ollowing format & language (in bold):
The maximum built-upon area per lot, in square feet, is as listed below:
Lot # BUA Lot # BUA Lot # BUA Lot # BUA
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 maybe
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 swa/es 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.
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 constructio .
Signature: /~". Date: /• Z -o ~
3
I, STE~LII' / IQ Cj~~Jt~ , a Notary Public in the
State of f-1~1i!Tu CA~tos~rvA ,County of JQaoupllJ ,
do hereby certify that _IrBNN~T.tI L ICI PtT' personally appeared
before me this the 2 S day of ~'A~1! vARa , 20 0~ ,and acknowledge
the due execution of the foregoing instrument. Witness my hand and official seal,
ignature
My Commission expires y~~d/ ~I~-
Form DRPC-1 Rev.1 Page 1 of 1
!~ ~~: .

~.
_

~.
.
-t ~' ~ ~~
,yam. ;~. ; ,
~y_~

~.... z. x <~
r;.;,f~~ tn;--~

Permit Number:
(to be provided by DWQ)
Drainage Area Number: 1
Wet Detention Basin Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
® does ^ does not incorporate a vegetated filter at the outlet.
This system (check one):
^ does ®does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of inspection and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire BMP Trash/debris is resent. Remove the trash/debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer a lication.
Vegetation is too short or too Maintain vegetation at a height of
lon a roximatel six inches.
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
Drainage Area Number: 1
BMP element: Potential roblem: How I will remediate the roblem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
Swale sediment off-site.
T'he pipe is cracked or Replace the pipe.
otherwise dama ed.
Erosion is occurring in the Regrade the swale if necessary to
Swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future roblems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
revent future erosion roblems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the lants rather than s ra in .
The vegetated shelf Best professional practices Prune according to best professional
show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide aone-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessa
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the lants rather than s ra in .
The main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the al al owth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
Drainage Area Number: 1
BMP element: Potential roblem: How I will remediate the roblem:
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs re air.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is dama ed Re air or re lace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 4.5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 3V5 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
ill in the blanks)
0 Permanent Pool Elevation 658.50
Sediment Removal .655 Pe anen Pool
-------------- Volume Sediment Removal Elevation 654 Volume
-------------------------------------------- ------
Bottom Elevatio 654 -ft Min.
Sediment Bottom Elevation 653 1-ft n
Storage Sedimer
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:DEB 44-Acre NW Corner
BMP drainage area number: l
Print name: First Carolina Properties
Title: President/Owner
Address: 1036 Branchview Dr. -Suite 102 Concord, NC 28025
Phone: 70~" nn" nnnn
Signature:
Date: / ' Z. 3 -p $
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, ST~"~L'1V A cR v r ~ , a Notary Public for the State of
.~NI7'1a CARotlN~ ,County of /Q~NIJq~V , do hereby certify that
A'1'rj~fy21 iL'. piBOPfT personally appeared before me this a? ~
day of ~'AJVOrQR,y , 20b 4 ,and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
,~.~~~EN t~~it~~~``
=~' ~'
MIITARY`
PI~BLIC
'~
~~~~~~~` C01fN~~~~a~\
SEAL
My commission expires `f f ~o~ZO/2
Form SW401-Wet Detention Basin I&M-Rev.2