20071856 Ver 1_More Info Received_20071206

Arch Aluminum stormwater documents
Subject: Arch Aluminum stormwater documents
From: "Jay Keller" <[e-mail]>
Date: Thu, 6 Dec 2007 11:25:12 -0500
To: <[e-mail]>
CC: "'Brian Speight"' <[e-mail]>
Hello Joseph, Brian & I would like to thank you for your help. Please
review the attachments per your conversation with him this morning. If you
need anything else, please contact us. Have a great day. Jay
Jay Keller
Principal
Keller Environmental, LLC
7921 Haymarket Lane
Raleigh, NC 27615
[phone] office
[phone] fax
[phone] cell
Content-Type: application/pdf
Grass Swale Supplement Channel #5 12-6-07.pdf
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Content-Type: application/pdf
Grass Swale I&M Agreement 12-6-07.pdf
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Content-Type: application/pdf
Grass Swale Supplement Channel #4 12-6-07.pdf
Content-Encoding: base64
Content-Type: application/pdf
Wet Detention Basin I&M Agreement 12-6-07.pdf.pdf
Content-Encoding: base64
Content-Type: application/pdf
Wet Detention Basin Supplement 12-6-07.pdf
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1 of 1 12/6/2007 3:09 PM

Permit No.
(to be provided by DWQ)
of wAT~9
~~ ~~ 0
Y~ ~ J --I
NCDENR ~`
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 !11) must be printed, titled out and submitted along with all of the required information.
~L PROJECT:INFDRMATIOfJ ~ . ;:,k ~. ,. ~ ; , ~,.., ,: :. s F ~ r :: x :~ ~ ,.F~ ti ~., } y ;,x ~~ .~.. ,.
a ~
.,
Project name Arch Numinum
Contact person Jay Keller
Phone number 919-844.7437.
Date 12/6/2007
Drainage area number 1
r~`
II: DESIGN INFORMATION ~ z"'r ' ' ~" ~ : f'° ~ - "'~' N_
Site Characteristics
Drainage area 314,069 ftZ
Impervious area 179,904.. ftz
impervious 57.28168014
Design rainfall depth 3.0 in
Storage Volume: Non•SR Waters
Minimum volume required 14,801 ` ` fts
Volume provided 15,745 ' " 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 ft'
Volume provided ft'
Peak Flow Calculations
Is prelpost control of the 1-yr 24-hr peak flow required? Y (Y or N)
1-yr, 24-hr rainfall depth 3.0 " ' in
Rational C, pre-development SCS Method (unitless)
Rational C, post-development 'SCS Method (unitless)
Rainfall intensity: 1=yr, 24-hr storm 3:0 inlhr
Pre-development 1-yr, 24-hr peak flow 18.9 ft3lsec
Post-development 1-yr, 24-hr peak flow 0.2 ft'Isec
PrelPost 1-yr, 24-hr peak flowcontrol -18.7 ft3lsec
Basin Elevations
Basin bottom elevation 423.00 ft
Sediment cleanout elevation 424.00 - ft
Permanent pool elevation 428.00 ft
Temporary pool elevation 429.00. ft
Volume and Surface Area Calculations
SA1DA ratio 3 36 ' (unitless)
Permanent pool, surface area required ' 10,665 ftz
Permanent pool, surface area provided 11,390 ' ` fie OK
Permanent pool volume 34,776 fta
Average depth for SAIDA tables 3.053204565 ft OK
Forebay volume 6,264 ft3
Forebay % of permanent pool volume 18 % OK
Temporary pool, surface area provided 17,911 ft
Form $W4D1-Wet Detention Basin-Rev.2 Pans I. & II. Design Summary, Page 1 of 2

Permit No.
(fo be provided by DWQ)
IL DESIGt~t;t~F~DRMATION"` .~ - ~- ~_ •";~ ~ = r
Drawdown Calculations
Treatment volume drawdown time 3 days OK
Treatment volume discharge rate ~ 0:06 ft3/s
Pre-development t-yr, 24-hr discharge ' 18.15 '' ' ft'/s OK
Post-development 1-yr, 24-hr discharge 0.18 ft3/s OK
Additional Information
Diameter of orifice 1:50 in
Design TSS removal _ gp %
Basin side slopes ' 3 :1 OK
Vegetated shelf slope ' ' 10 .1 OK
Vegetated shelf width 10 ft OK
Length of flowpath to width ratio 3 :1 OK
Length to width ratio 3 1 OK
Trash rack for overflow & orificel Y ' (Y or N) OK
Freeboard provided 1 ft OK
Vegetated filter provided? N (Y or N) Design must be based on 90% TSS removal
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 TRAIN VALVE IN RISER AND PUMP REMAINING2 FEET
Form SW401-Wet Detention Basin-Rev.2 Parts I. & II. Design Summary, Page 2 of 2

Permit No.
(to 6e provided by D4VQ)
Please indicate the page or plan sheet numbers-where the supporting docunreniation can be found. An Incomplete submittal package will
result in a requestfor addittonakfnformation. -This w(ll delay final review and appcaval of the.,project, initial in the space provided to
indicate iha toilowing designrequirements have been met: ii the applicant has designated an agent, U1e agent may initial below. If a
requirement has net been met, attach justif€cation.
Pagel-Plan
€nitia)s Sheet No:
~ ~' ~~+ 1. Plans (1" - 50' orlarger} of the entire site showing:
- Design at ultimate bti€Id-out;
-:Off: site drainage {if applicable},
-Delineated drainage basins {include Rational C caeffic€ent per basin},
- Basin dtmensians,
-Pretreatment system,.
- High flow bypass system,
- Maintenance access,
-Recorded drainage easement and publicright of way {ROW},
-Overflow device, and
- Boundaries of drainage easement.
~
~- - ~~ ~'~ 2, Partial plan (1" = 30` or larger} and details for the wet detention basin shaving:
' ~'7„ t~ ~( -Outlet structure-with Gash rack arsimilar,
-Maintenance access,
-Permanent pool dimens€ans,
- Forebay and main pond with haMened emergency spillway,
-Basin cross-section,
-Vegetation specification for planting shelf, and
-Filter strip.
.. ~ ~~f`~ y 3. Section view of the dry detention basin (1° _ 2Q' or larger} showing:.
-Side slopes, 3:1 or lower; ~ ~ ~.~ ~,~
-Pretreatment and Geatmentareas, and ,~~'' ~~/'~ ~~ ~'~" '~`'~
-Inlet and outlet structures. .
f~~'.._._ . ~ ?-+a 4. (f the basin €s used for sediment and erosion control during oonstruct€on, clean out of the bas€n is speafied
on the plans prior to use as a wet detention basin.
~;`~.. +~~ 5: A table of elevations, areas, incremental volumes & accumulated volumes #or overall pond and for forobay,
"`'''"~ sl•.~e ~ to verify volume provided,
_ ti. An assurance that the installed system wittmeet design specifications upon initial operation once the
G y , ~ i project is compete and the entire drainage area is stabilized.
~ ~-~"' 7, A cansGuclton sequence that shows how the wei detention basin will be protected from sediment until ttre
C7'. o ~ entire drainage area is stabilized.
~
r
"~~r
8. The supporting calculations.
y
4 !Y ~ j
.a
~
FW1~CA'7~'-f
[J~' /y
/V.f
V I
~''~~ g. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
:;_ ~-~,vtaar~ 10. A copy of the deed restriction.
Font SW401-Wet getentfon Basin-Rev,t Part 111. Required !tams Checklist, Page 1 of 1

Wet Detention Basin Tnspection.anci'Maintenanee Agreement
I will keep a maintenance record on this B1VIl'. This maintenance record will- be kept in a
log in a known set location:. Any deficient BMP elements noted in the: inspectioxr will ve
corrected, repaired or replaced immediately. Thsse deficiencies can effect the integrity
of structures, safety of klie public, and the xem~val efficiency of the BMP:
Tl~e .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 ~ class not. incorporate a vegetated falter at the outlet.
This system (check one};
does- ^ does riot incorporate pretreatment other than a forebay.
lmportanfi maintenance procedures:
- Innmedately after the wet detextion-basin is established, the plants an the
vegetated shelf and perimeter, of the basin should be watered twice weekly if
needed, until. thepIants i~ecome established. ,(commonly six weeks).
- Naportion of therwet detention pond should be fertilized after the first initial
fertilization that i~ required to establish the plants on the vegetated shelf.
- Stable lnoundcover should be maintained`zri the drainage area to reduce the
sediment load to the wet detention basin.
-- If the basin must be dxained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be niix-iuuzed to the
maxirnunl extent practical.
- Once a year, a dam safety expert should inspect the emb<uikanent.
After the wet detention pond is establiahed, it should be inspected ante a month and
within 24 hours after every storm event greater than 7,~ inches {ox 1.5 inches if in a
Coastal County). Records o€ inspection and maintenance should be keptin a known set
location. and must be available upon, request.
Inspection activities shall be performed as follows. Any pxoblems that are found shall
be repaired immediately.
BMA" element: Potential oblem; How I will remediatethe roblem:
The entixe BMP Trash debris is xesent. Remove the trash' debris.
The perimeter of the wvet Areas of liars soil andJor Regrade the sail if necessary M
detention basin erosive gullies have foxrned. remova the gully; and then plant a
grouxtci cover and water w1ti1 it is
established. Provide lime and a
one-tinge fertilizer a lication.
Vegetation is too shortor too Maintain vegetation at a height of
lon a roximetel six inches.

8Mi':etement: Paterttiat rablem:~ .How I will xemediate the roblem;
The inlet device: pipe or T'he pipe is•cloggc~d. Unclog the pipe. Dispose o.f the
swale sediment aff-site.

The pipe is, cxacicecl ar _
I Replace the pipe. _~
otherwise damaged. 1

Erosion is gccurring ii1 the __
~ RPgrade the Swale if necessary to
swa}e. ! .smooth it over and provide exosian
cont~al devices such a& reinforced
turf xnaltinb or iipi'ap to avoid.
~
~~~
_ ___
_ fulure probie.ms with erosion.

The farebay
__
_
Sedime:rt has accuu•~u.l.ated to ~_
Search far the source of the
a depth greater. than the sediment and remedy the provIezn if i
original design depth for possible. Remove the sediment and ~
sediment storage. dispose of it in a lorat}on where it '
will not cause izripacts to strean•~6 ar
__ _ the Lil~it'. ~
)/rosion has occurred: Provide additional erosion.
~ protection such as reinforced turf
triatting or ripra~ if needed to
~ revent future eroaion~rol?lezns.
Weeds are present, (Remove the weeds, }areferably by
hand. if pesticide is used, wipe it on

h
h _ _ _ #I~e plants rather than fraying.
T
e vegetated s
elf 13est'~z•ofessio.nal practices + i'a•a.ne according to best professional
show that pruzvng is needed , practices
to maintain aptiznal p4~nt
health.

Plants are dead, diseased or _
Determine the source of the ;
dying. prablexn: soils, hydrolagy, dtscase, ~
etc, I:enzedy t}ie problem and I
repl<zce plants. Provide a one time
ferkilizet appIica#ion to establ.is.h the
ground. cave~• if a soil test indicates

_ it is necessary. +
Y`•
Weeds are preseztl•. ~
Remove Elie weeds, preferably l~};
hand. if peshride is used, wipe it on
the plants rather than: spraying.
1
The main. treatment area _
Sedimetat has accumulated .to + _..~
Search for the source of the
a depth greater ihazi Ehe se.dzznent and remedy t}ie prnblezn if
anginal design sediment p~~ssil~Ie. liemove the sedimuit and
:storage depth. dispose of it in:a location where it
will not cause impacts to streams ar
the.BMP.

t11ga1 growth. covers aver~~ __
C;onsult a professional to remave~
50`~ of klae area:
Cattails, pliragzrzztes or atl~er az~d control the all;al Trowth.
Reinave the pants by wiping tlie;n
invasive plants raver 509'0 of.
the basin surface. 1 with pesticide (ci.o not spray).
!

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 damn 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 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 4 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
X11 in the blanks)
Sediment Removal
Bottom
Pennanent Pool Elevation 428
424 ---------- ~ Pe anen
- Volume
423 -ft Min.
Sediment
Storage
FOREBAY
Pool
------Sediment Removal Elevation 424 Volume
Bottom Elevation
MAW POND
1-ft
Storage

1 acknowledge and agxee by nay signature below that I am,responsible far the
perfornzar-ce of the maiu~tenance.proeedures listed above. 1'agree to notify D~WQ of any
problems with the system ar prior to any changes- to the system ar responsible party.
Print name: ~ t (.. G ~ t=~ o~~
Title: D u~n/,En S ~+~ P
.Address: (~ ~" W~RTr~f~ct~-S Si ~7y~%(~~et~ ,~•~G• 2?y~'.6 ____
1`3ote: The legally responsible party should nest be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdvision'has been. named the president.
~cz.~.vv~.-,..~~,,,~- ~k ~',,c.x~, ,,a Natary Public for the State of
~~ _ ,County of J•~ ~~.~~? , do hereby certify that
T
(:t ~, E ~ c ~~-~rvt f~ ~ ~•,~~, ~~ personally appeared before me this _~__,
day of ~~'~a~.f,~,_, G'U ,and acknowledge the die' execution of the
forgoing wet detention basin maintenance requirements. ~Vitness my hand anal offrciaf
seal,
F"",~C3 7',~;~y
~. ~
~a ~8 t.e~ •~;
SEAL

My commission expires ~~ ~ ~`d "` ~b 1 '~
date: C ~ ~ " Q 7

Permit Number.
(to be provided by DWQ)
of W AT~9
~~~ O~ ~G
_~~~111 >
NCDENR T
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
GRASSED SWALE SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part !ll) must also be filled out, printed and submitted along with all of the required information.
I: PROJECT.:INFORMATION'~~2~~~fi7x~ ~ ;;.~r ~. a-, :rst,~,'~.~.~ yG:. ,x_, >,.r. ~ ~.~~ ~~~a~~_t'~,~ = a~.
Project name Arch Aluminum
Contact name Jay Keller
Phone number [phone] -
Date December fi, 2007
Drainage area number Channel #4
II: DESIGNINFORMATION• ~ '~~ ~ ~ f. }~ ~ 1 ~ jt ~ - 3' ~~• ~+
.. ,,,,.. _ .... _~....., ti.„_._,. ..
Site Characteristics
Drainage area ' 59,677 ~
Impervious area 3Q928 ftz
Percent impervious 51.8%
Design rainfall depth PEAK RED. inch
Peak Flow Calculations
10-yr, 24-hr runoff depth -0:47' in
10-yr, 24-hr intensity 7,19 ' inlhr
Post-development 10-yr, 24-hr peak flow ' 6.02 ft3lsec
Velocity
Maximum non-erosive velocity (peak 10-year storm) 4.5 ft/sec
.,Soil characteristics (enter "x" below)
Sand/silt (easily erodible) X
Clay mix (erosion resistant)
Grass Type (enter "x" below)
Bermuda
Tall fescue X
Bahiagrass
Kentucky bluegrass
Grass-legume mixture
Swale type: Fill out one of the options below:
Option 1: Curb Outlet Swale: N ' ! (Y or N)
Maximum velocity
Side slopes :1
Swale length ft
Option 2: Convevance Swale, Seeking Pollutant Credit: Y ' (Y or N)
Maximum velocity for 10-yr storm 1:0 ftlsec
Side slopes 5 :1
.Swale length 220 ft
Option 3: Convevance Swale. Not3: Convevance Swale. Not Seeking Pollutant Credit: N ` ` (Y or N)
Maximum velocity
Side slopes :1
OK
OK
OK
Form SW401-Grassed Swale-Rev.t Parts I and II. Project Design Summary, Page 1 of 2

Permit Number:
(to be provided by DWQ)
Swale Characteristics
Swale Shape: Enter an "x" in the appropriate cell below:
Trapezoidal x
Parabolic
V-shaped
Width of the bottom of the Swale 6' '' ft
Width of the top of the swale 18 ft
Maintenance agreement: Is this included in the application? Y (Y or N)
This design is for the following design option:
Option 1: Curb outlet Swale N
Option 2: Conveyance Swale, seeking pollutant credit Y OK. Maintenance provision not needed
Option 3: Conveyance Swale, not seeking pollutant credit N
Additional Information
Is the Swale sized for all runoff from ultimate build-out?
Is the BMP located in a recorded drainage easement with a
recorded access easement to a public Right of Way (ROW)?
What is the distance from the bottom of the Swale to the SHWT?
What is the ground level elevation?
What is the elevation of the bottom of the Swale?
What is the SHWT elevation?
What is the longitudinal slope of the Swale?
What is the depth of freeboard?
YES OK
YES (Y or N) OK
12.0 ft OK
435.0 fmsl
434.0 fmsl
422.0 fmsl
0.1 % OK
0.5 ft OK
Form SW401-Grassed Swale-Rev.t Parts I and II. Project Design Summary, Page 2 of 2

rGnun~w.
(to be assigned by l)iNC~)
Please indicate the page orplan sheet numbers where the 5uppordng documentation can be found. An incomplete eubm<hal package
viii 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, Ifthe applicant has designated an agent, the agent may initial
below. tf a requirement has not been-met, attacl~ justification.
Initials Page! Ptan
Sheet iJo,
~~~ Ca `C~ 1. Plans {1" + 50' or larger} of the entire site showing;
• t7esign at ultimate build-out;
- Offsite drainage (if applicable),
- Delineated drainage basins (include Rational C coettioient per basin),
- Swale dimensions (width; length, depth),
- Maintenances access,
- Recorded drainage easement and public right of way {ROAN),
-Grass species, and
-Boundaries of drainage easement.
C `~ 2. Plan details {t" = 50' or larger) for the grassed-swale showing:
C?,mot • Swale dimensions {width, length, depth),
• Maintenance access;
-Recorded drainage easement and public right of way{ROW);
- Dosign at ultimate'bu11d-out,
-Crass species,
- Off-site drainage (ifappficablej,and
-Boundaries of drainage easement.
,~ ~ ~- .~~ 3. Section vlewof the grassed Swale {1" = 20' or larger] showing:
~,` orb ~ 4. Support(ng calculations (including maximum velocity calculations for applicable stoma}
~"`~" ~ sy p~t~u-~Fs
5. An.assurance that the installed system will meet design specifications upon initial operation once the
C y G f project Incomplete and the entire drainage area is stabilized:
~~ C'?, of 6. A constructlan sequence that shows how the bioret©ntion cell will be protected from sediment until the
entire drainage area is stabilized:
-Side slopes,
• l.angltudlnei slope,
-Freeboard
- Swa{e dimensions, and
- SHWT level{s}
~i,_ m z~l~.c*.fs 7. The supporting calculations (including underdrain ealeulatlons, if applicable}.
,,~~„ ~¢~ 8. A copy of the signed and natarized inspection and maintenance (I&M) agreement.
,,,_ ~% 9. A copy of the deed. restriction.
s~~~
_....,.. -...____. h._~_ .,..., PaR ln, page 1 ar t

Permit Number:
(to be provided by DWQ)
~~ OF W A TFq
~'a~/~ O~ - 9G
s+.~~._~ } r'
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
GRASSED SWALE SUPPLEMENT
This form must be fitted out, printed and submitted.
The Required Items Checklist (Part Ill) must also be filled out, printed and submitted along with all of the required information.
I..PR05EGT<IN,DRMATIONF~~` ~~.~`~~,a.~=a ~.>;>ra 'nom,":~r`s~ ` r= ~~,ny~ r~ ,~ .s.h~,, ,~°_ -~
Project name Arch;,lw,~irum
Contact name Jay Keller
Phone number [phone]
Date December 6; 2007
Drainage area number Channel #5
'II, DESIGN INFORMATIONaxx~ ^h; ~z~'~~ .,~~~•~ _~;.,~:~.c~ ~~-, '~;,. .:''~:~;~~, ~,~ `:r.< ~ .: F~ ~ .
Site Characteristics
Drainage area 314,068 ftz
Impervious area 179,903. ftZ
Percent impervious 57.3%
Design rainfall depth ` ' -PEAK RED. inch
Peak Flow Calculations
10-yr, 24-hr runoff depth 0.53 in
10-yr, 24-hr intensity 7.19 in/hr
Post-development 10-yr, 24-hr peak flow 2.55 ft3lsec
Velocity
Maximum non-erosive velocity (peak 10-year storm) 4.5 fUsec
Soil characteristics (enter "x" below)
Sandlsilt (easily erodible) X
Clay mix (erosion resistant)
Grass Type (enter "x" below)
Bermuda
Tall fescue X
Bahiagrass
Kentucky bluegrass
Grass-legume mixture
Swale type: Fill out one of the options below:
Option 1: Curb Outlet Swale: N (Y or N)
Maximum velocity -
Side slopes :1
Swale length ft
Option 2: Conveyance Swale. Seeking Pollutant Credit: Y (Y or N)
Maximum velocity for 10-yr storm 1.0 ft/sec
Side slopes 5'"' :1
Swale length 152 " ' ft
Option 3: Convevance Swale. Not Seeking Pollutant Credit: N (Y or N)
Maximum velocity
Side slopes ' ! ;1
OK
OK
OK
Form SW4l)1-Grassed Swale-Rev.1 Parts I and II. Project Design Summary, Page 1 of 2

Permit Number:
(to be provided by DWQ)
Swale Characteristics
Swale Shape: Enter an "x" in the appropriate cell below:
Trapezoidal x
Parabolic
V-shaped
Width of the bottom of the Swale ' ' 2 ft
Width of the top of the swale 14 ft
Maintenance agreement: Is this included in the application? Y (Y or N)
This design is for the following design option:
Option 1: Curb outlet swale N
Option 2: Conveyance Swale, seeking pollutant credit Y OK. Maintenance provision not needed
Option 3: Conveyance swale, not seeking pollutant credit N
Additional Information
Is the Swale sized for all runoff from ultimate build-out? YES OK
Is the BMP located in a recorded drainage easement with a

recorded access easement to a public Right of Way (ROW)? YES (Y or N) OK
What is the distance from the bottom of the Swale to the SHWT1 2.2 ft OK
What is the ground level elevation? 428.0 fmsl
What is the elevation of the bottom of the swale? 424.2.fmsl
What is the SHWT elevation? 422.0 fmsl
What is the longitudinal slope of the swale7 0.2 % OK
What is the depth of freeboard? 0.5 ft OK
Forrn SW401-Grassed Swale-Rev.1 Parts I and II. Project Design Summary, Page 2 of 2

Permit No:
(to Le assigned by OWf,2J
Please indicate th8 page or plan sheet numbers where the supporting documentation can be found. An incampiete submittal package
wilt result in a regaest for addwonat informagon Thls wtll 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. tf a requirement has not been met, attach justification,
inittats Page! Plan
Sheet Ho. -
~,,,.,, G'a •i~'r6 1: Plans {1" +'50' or larger} of the entire sife showing;
• Design at ultimate build-out,.
- Off--site drainage {if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Swale dimensions (width, length; depth),
- Maintenance acxess,
- Recorded drainage easement and'public right of way (ROW),
-Grass species, and
-Boundaries of drainage easement: -
~ `~ 2. Plan details {1" = 50' or larger) for the grassed swale showing:
C7.~'~ 3. Section view of the grassy Swale (1" = 20' or larger) showing:
C ~. oC -Swale dimensions {width, length, depth),
- Maintenance access,
• Recorded drainage easement and public right of way (ROW),
- Design at ultimate build-out,
-Grass species,
-Off-site drainage (ifapplicable),and
• Boundaries of drainage easement.
-Side stapes,
- Langltudinal slope,
-Freeboard
- Swale dimensions, and
- SHWT levei(s}
_ rk l4c~s 4. Supporting catoulatians (including. maximum veloclty calculations for applicable storms]
5. An assurance that the installed system will meet. design specifications upon initial operation once the
C~ ~~ project Is complete and the entire drainage area is stabilized.
,,~,_„ ~ ~ °! 6. A construction sequence that shows- how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
~. , ~„rk?~*~ 7, The supporting calculations (including underdrain caicuiations, if applicable},
~~~ 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
~,,,_ +~-%~' 9. A copy of the deed restriction.
5W40t•Grassed Swale-Rev.1 Pert III, Page 7 or i

Grassed Swale Inspection and Maintenance Agreement
I will keep a maintealance retard on this 13MP. This. maintenance record will be kept in a
log in a known setlocation. Ariy deficient BMI' eleznents noted in the inspection will be
corrected, repaired or xeplaeed immediately. 'T`hese deficiencies can affect the integrity
of'struetures, safety of tlze<pu'~lic, and the removaTefficiency of the BMl'.
Important maintenance procedures:.
- The. drainaage area of -the: grassed Swale will be carefully managed to reduce the
sediment Ioad`to tTze ~a5sed Swale.
- Aftex the first-time fertilization to estaUlisl~ the grass in the swale, fertilizer will
not be applied to the grassed Swale.
The grassed swale will be inspected once a.quartcr. Records of inspection and
maintenance will be kept in a known set location and will be available upon request:
Inspection activities shall),e performed as follows: Any problems that ate found shall
be-repaired immediately:
BMP element: Potential. roblem How T will reniediafe the roblem:
The entire Iength of the 'TrashJdebcis is present. Removethe-trash/debris.
Swale
Areas of Uare, soil acid/or Regrace the soil if necessary to
erosive gullies have formed. remove the gully, and then re-sad
(or plant with other appropriate
spedes) and water until established,
Provide lime and cone-time
fertilizer a licatian.
;3edirnent covers the grass at Reulove sediment and dispose in an
the batitom of the s~wale. area that wi11 nvt unpack streams or
I3iVIPs. Re-sod if necessar .
Vegetation.is too short or tno Maintain. vegetation at a height of
ton . a mximatel stir niches.
The receiving water Erosion ox other sigiie of :Contact the.NC Uivisian of Water
damage have occurred at the C,~uality 401 C3versight-Unit at R19-
6utlet. 733-1786.

I aelcuowledge and agree by my signttiure below that. Y am responsible fqr the
performance of the maintenance procedtues listed above. I agree to notify T3WQ of any
problems with the systemor prior to any changes to th.e system orresponsible-party.
Prinfi name: ~ t (. C. ~ L~0 ~n
Address: 2y- ~' w~P'r'N~n•S 51 ya/G~Sycc.~,E //C 2?>'9'~
Note: T7ae legally responsible party shauicl not be a homeowxtets association unless more -than Sd% of
the' lots. have been sold and a resident of the subdivision has been named. the president
1, l cz~w..v.r.~.. ~~ ~-~r~~n ti, , a Notary Public .for the State of
~.,~ ,County of "`~ ~ do hereby certify that
l ,1 J, t ~ ~.~, ,,~1 ~ y~j ~~,~~ personally appeared before me dais „
day of }~{~ t% ,~~~ ^G'~' „and acicnawledge the due execution of the
forgoing wet detention basin maua~tenance requirements. Witness my hand and official
F _ _
seal, "-1 ' ---__~-.-..
..~'~ ...~«...... ~'+. a
comm. ,
A~/61.1~
SEAL.
My conimissiax expires ~ _ a ~ ~' ~d 1
Date: t! ' ~` °