20080398 Ver 1_More Info Received_20081218 (2)

Permit No. D ~ - 02> q 6
(to be provided by DWQ)

111I. 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.

0&

Pagel Plan
Sheet No.
C l{)(-t..lot.!

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.

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DEe 2 3 2008

OeNR. WA1ER QuAL! (V
weTLANOll AN(J fJtORMWATER BRANCH

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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.

3. Section view ofthe dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.

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.

5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided,

6. An assurance that the installed system will meet design specifications upon initial operation once the
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
entire drainage area is stabilized,

8. The supporting calculations.

9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.

PPt/Jt Iit{XY10, A copy of the deed restriction.
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Form SW401-Wet Detention Basin-Rev.1

Part III. Required Items Checklist, Page 1 of 1

Permit No.

(to be provided by DWQ)

6A.
NCDENR

STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT

O~~fWATl:-9Oc;..
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This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.

II. PROJECT INFORMATION
Project name
Contact person
Phone number
Date
Drainage area number

Peddler's Square
Kevin RAiford, PE

828-506-3411
12/18/2008

III. DESIGN INFO~MATION
Site Characteristics
Drainage area
Impervious area
% impervious
Design rainfall depth

Storage Volume: Non-SR Waters
Minimum volume required
Volume provided
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is pre/post control of the 1-yr 24-hr peak flow required?
1-yr, 24-hr rainfall depth
Rational C, pre-development
Rational C, post-development
Rainfall intensity: 1-yr, 24-hr storm
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Basin Elevations
Basin bottom elevation
Sediment clean out elevation
Permanent pool elevation
Temporary pool elevation
Volume and Surface Area Calculations
SAfDA ratio
Permanent pool, surface area required
Permanent pool, surface area provided
Permanent pool volume
Average depth for SAfDA tables
Forebay volume
Forebay % of permanent pool volume
Temporary pool, surface area provided

255,697 ff
118,048 ff
46.16714314 %
1.0 in
fe
fe
in
ft3
ft3
ft3
ft3
N (Y or N)
in
(unitless)
(unitless)
in/hr
ft3/sec
ft3/sec
fe/sec
2934.00 ft
2935.50 ft
2940.00 ft
2941.00 ft
2.30 (unitless)
5,881 ff
5,894 ft2 OK
17.716 ft3
3.005768578 ft OK
3,607 ft3
20 % OK
6,250 ff

Form SW401-Wet Detention Basin-Rev.2

Parts I. & II. Design Summary. Page 1 of 2

Permit No. 0 ~ - 0.3 q B
(to be provided by DWQ)

III. DESIGN INFORMATION

Drawdown Calculations
Treatment volume drawdown time
Treatment volume discharge rate
Pre-development 1-yr, 24-hr discharge
Post-development 1-yr, 24-hr discharge

Additional Information
Diameter of orifice
Design TSS removal
Basin side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build-out?
Drain mechanism for maintenance or emergencies

4.3 days
0.03 fe/s
26.11 fels
23.92 fels

1.00 in
90 %
3 :1
10 :1
10 ft
3 :1
3 :1
Y (Y or N)
1 ft
N (YorN)
Y (YorN)
Y (Y or N)
:mergency Spillway

Form SW401-Wet Detention Basin-Rev.2

OK

OK
OK

OK
OK
OK
OK
OK
OK
OK
Design must be based on 90% TSS removal
OK
OK

Parts I. & II. Design Summary. Page 2 of 2

WET [WETLAND] DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
[Wetland maintenance wording is bracketed. Please modify the document as appropriate.]

The wet [wetland] detention basin system is defined as the wet [wetland] detention basin, pretreatment
including forebays and the vegetated filter if one is provided.

Maintenance activities shall be performed as follows:

1. After every significant runoff producing rainfall event and at least monthly:

a. Inspect the wet [wetland] detention basin system for sediment accumulation, erosion, trash
accumulation, vegetated cover, and general condition.

b, Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.

2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.

3. Inspect and repair the collection system (Le, catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.

4, Remove accumulated sediment from the wet [wetland] detention basin system semi-annually or when
depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be
disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact
water quality (Le. stockpiling near a wet [wetland] detention basin or stream, etc.).

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.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks,]

When the permanent pool depth reads 1.5
removed.

feet in the forebay [and micro-pool], the sediment shall be

BASIN DIAGRAM
(fill in the blanks)

\7

~~~~~-~~-~-

Bottom E vation 2938.0 5%

Permanent Pool Elevation 2940

_ _~~~ ?~_<!i~~~! _~~~~~~! ~I~y?!~,,-~ ~~~~, 5 _ u 17_5.0(0__

FOREBAY

MAIN POND

Page 1 of2

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PAGE 02
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IfQr \'\'Itianda: Wetland ~.a.ctaMIIta. i!1the~...~ t>> !MintMntfby ~P!rinG"ba.....
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6. If the tlaain lIW$l be draW1ed for an emergency at to pertorm m.tm.nanee. the1lu*hing. fit ~nt through.
mW''''''''OllnCYnn Mairbe rmnlmiQd totMmal{imuM &lMnt ~.

1. Atl ~ ~ the w.t {Wlltlend) dal'ltlon blain ayat..-n ihaU M malntaintd in good WOIldna orciM'.

8. t6\itlt epr...,. or otherli;uctufM that provtd. dIfIU.. flow .halt be rna"*'ntd everyal:( month$,AJ{
tiOCum*ed'~ Gt14~tA'-..t.~ t~.om tho! str~..'and l iewf ~ioft thali be
me:""'imtd eetOU tfte enth ~ -,pNBdII'\tI.fItnJet\.l", .My-.cfcmm~nt--ttf~~b.,,1"8p1tlledand'or
r.a."\t5d"~,

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LINE LENGTH BEARING --
L1 12.91 N65011'44"E
L2 23.85 S05059' 42"E
L3 20.87 N81055'57"\J ,/
L4 8.80 S02051'52"\J

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THIS INSTAllED SYSTEM Will MEET All DESIGN
SPECIFICATIONS UPON INITIAL OPERATION ONCE THE PROJECT
IS COMPLETE. THE AREA AROUND THIS PROJECT HAS BEEN
STABiliZED AS IT HAS BEEN IN EXISTENCE FOR OVER TWO
YEARS. A PERMANENT STABiliZED GROUND COVER HAS BEEN
ESTABLISHED. ALL CONSTRUCTION SHALL PROTECT THE WET
DETENTION BASIN FROM ANY SEDIMENT AS THE WET
DETENTION BASIN IS THE ONLY CONSTRUCTION TO TAKE PLACE
ON THIS SITE..

( IN FEET )
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TOTAL ACREAGE == 5..87 ae
IMPERVIOUS ACREAGE == ,2.71 ae
% IMPERVIOUS == 2.71/5.87 = 46%

46% IMPERVIOUS @ 4' DEPTH == 2.30% FOR 90% POLLUTANT
REMOVAL EFFICIENCY

PERMANENT POOL SA == (2.30/100) * 5.87 == .135 ac = 5881 SF

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Rv = 0,.05 + 0.009(46) = 0.46 in/in

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VOLUME == (1 in)(1/12 ft/in)(0.46 injin)(5.87 ae)
VOLUME == 0.225 ae..ft == 9801 ef

FOREBAY VOLUME == 20% DESIGN RUNOFF VOLUME
VOLUME == (20%)(9801 ef) == 1960 ef

ACTUAL DESIGN
FOREBAYVOLUME == 3607 ef
FOREBAYVOLUME == 3607 ef > 1960 ef DESIGN VOLUME
PERMANENT POOL VOLUME = 17,716 cf
TOTAL VOLUME == 17,716 cf > 9801 ef DESIGN VO,LUME

PERMANENT POOL SA == 5894 sf > 5881 sf DESIGN SA

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PROJECT NUMBER

2008- 26

SHEET

C-103

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411 PVC PIPE GROUTED INTO BOX
411 PVC SCREw CAP ~ COUPLING
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EL 2940,00

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EL 2934,00
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6fi #57 wASHED STONE BASE

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2,950.00

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2,945.00

2,940.00

2,935.00
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PERMANIEN'T POOL VOLUME CALCULATIONS

AREAS

CALCULA 1110NS

VOLUME

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@ TO @ (4791 sf.. 680 s1)(2.75 ft) + (680 81)(5.5 ft)

2671 cf

15,045 of

PERMANENT POOL TOTAL VOLUME

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1910 sf /FOREBAY POOLI

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FOREBAV POOL VOLUME CALCULATIONS

AREAS

CALCULATIONS

VOLUME

<D TO @

(2160 8f..1910 sf)(1.0ft).. (1910 sf)(2.0 ft)

3607 of

FOREBAYPOOLTOTALVOlUME

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PROJECT NUMBER
2008- 26
I SHEET I
C--104

2934

2940

2938