20091022 Ver 1_Minor Variance_20090924

• TO: DWQ 401 Unit JOB CODE: MCTH
0
Integrated Oesigo
2321 Crabtree Blvd.
Suite 250
Raleigh, NC 27604
TEL: [phone]
ATTN: Amy Chapman
RE: MCTH - Noble Townes Minor Variance
09--1022
No. Copies
1 org+2cp
3
1
1
DATE: 22 September 2009
X Attached:
Under separate cover:
QF9 c?I E on[ 9?
SEP 2 4 2009
DENR • WATER QUALITY
Description WETLANDS AND STORMWATER BRANCH
Variance Request Form
Existing and Proposed Impervious Surface Plans
Letter from Buffer mitigation bank
Stormwater Runoff and Nitrogen Quantification Calculations Package
CA - 20-It r'4'Y'on;
Notes:
Amy,
This is the project you met with Ed Sconfienza about a couple weeks back. Please let me know if you need anything else.
Thanks,
Sam Nye
VIA FAX -PAGES Including this Cover
OVERNIGHT
MAIL
X HAND CARRY
TO BE PICKED UP
COPIES TO:
Integrated Design, PA
1111 Oberlin Road
Raleigh, North Carolina 27605-1136
Please notify us immediately if enclosures are not as noted
X FOR YOUR REVIEW
FOR YOUR APPROVAL
FOR YOUR USE
AS REQUESTED
RETURN _ COPY EACH
SIGN :
G // - e,
Samuel R. Nye, PE
Phone: [phone]
Fax: [phone]
www.id-aep.com
AI
C F
C_ nor
(' H. ` C F
Lirector Secr ry
Variance Request Form
(For Minor and Major Variances)
Protection and Maintenance of Riparian Areas Rules
NOTE: This form may be photocopied for use as an original.
Check the appropriate box below:
? Major Variance
X Minor Variance
Please identify which Riparian Area Protection Rule applies (Note-this must be one of
North Carolina's four buffered river basins. The River Bain map is available at
12o.enr.state .nc.m;h )
X Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC 02B.0233)
? Tar-Pamlico River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC 02B.0259)
Part 1: General Information
(Please include attachments if the room provided is insufficient.)
1. Applicant's name (the corporation, individual, etc. who owns the property):
GHC - WHITAKER TOWNES_ LLC
2. Print owner/Signing official (person legally responsible for the property and its compliance)
Name: Craig Briner
Title: -Managing Member
Street address: 404 Glenwood Avenue
City, State, Zip: -Raleigh, North Carolina 27607
Telephone: ( 919 )_637-7587
Fax:
3. Contact person who can answer questions about the proposed project:
Name: Ed Sconfienza, P.E., Integrated Design
Telephone: L919 )_832-6658
Div-
Version 6: July 2009
Fax: ( 919 ) 839-2255
Email: _efskid-aep.com
4. Project name (Subdivision, facility, or establishment name -consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Nobel Townes
Project location:
Street address: 2530, 2532, 2544 & 2546 Noble Road
City, State, Zip: Raleigh, NC 27608
County: Wake
Latitude/longitude: 65048"45'N 78037'53"W
6. Date property was purchased: August 31, 2009
Directions to site from nearest major intersection (Attach an 8 '/2 x 11 copy of the USGS
topographic map indicating the location of the site).
From the intersection of Wake Forest Rd & 1440, south on Wake Forest Rd +0.9 mile, turn Rt on
McNeil Street, 2 blocks to the intersection with Noble Road. Property is on the left.
Stream to be impacted by the proposed activity:
Stream name (for unnamed streams label as "UT" to the nearest named stream):
UT to Crabtree Creek
Which of the following permits/approvals will be required or have been received already for this
project?
Required: Received: Date received:
_N/A_
N/A
N/A
_N/A
_Y*In Process - C.O.R. Grading Permit
_N/A
_N/A
N/A
Permit Type:
CAMA Major
CAMA Minor
401 Certification/404 Permit
On-site Wastewater Permit
NPDES Permit (including stormwater)
Non-discharge Permit
Water Supply Watershed Variance
Erosion/Sedimentation Control
Others (specify)
Part 2: Proposed Activity
(Please include attachments if the room provided is insufficient.)
Description of proposed activity [Also, please attach a map of sufficient detail (such as a plat map
or site plan in Adobe (pdf) format) to accurately delineate the boundaries of the land to be utilized
in carrying out the activity, the location and dimension of any disturbance in the riparian buffers
associated with the activity, and the extent of riparian buffers on the land. Include the area of
buffer impact in ft2.:
The brobosed develobment includes remodeling existing rental units into townhomes which were
originally constructed prior to the NRB rules. The remodel includes deck additions. We are
proposing to not extend the decks for lots 8 and 24 because that would result in an impact to Zone
1. We are proposing 365 sf of impacts to Zone 2 of the NRB. These impacts consist of a wooden
deck with mulch underneath. The existing dumpster for this project is on aumpster for this project is on a _ gravel pad and we are
Variance Request Form, page 2
Version 6 July 2009
proposing to make the pad concrete. This area is in Zone 1 but is not being considered an impact
because it is an existing dumpster pad.
2. Fill in the table below to identify the square footage of impact to Zones 1 & 2 in the protected
riparian buffers and the required mitigation (Fill in the impacts portion of the table, even if
mitigation is not required):
Buffer Impact
Zone of Impact in Number Purpose for
Multiplier Required
Impact Square Feet (Indicate on the Impact Mitigation
Plan Sheet)
Zone 1 0 NA NA 3 0
Zone 2 365 1 & 2 Deck Addition 1.5 548
Total 365 548
*Zone 1 extends out 30 feet perpendicular from the most landward limit of the top of bank or the rooted herbaceous
vegetation; Zone 2 extends an additional 20 feet from the edge of Zone 1.
State reasons why this plan for the proposed activity cannot be practically accomplished, reduced
or reconfigured to better minimize or eliminate disturbance to the riparian buffers:
The existing develobment bredates Neuse River Buffer rules and was built closer to the creek
than would be acceptable based on today's standards. We are adding to the buffer impact only for
the purpose of extending the decks on the existing buildings that are within the buffer. We have
alreadv reduced our Mans to show no impacts to zone 1 of the buffer by not adding decks to lots 8
& 24
4. Description of any best management practices to be used to control impacts associated with the
proposed activity (i.e., control of runoff from impervious surfaces to provide diffuse flow, re-
planting vegetation or enhancement of existing vegetation, etc.):
The decks will be installed with slats for drainaize. Underneath the slats we will install mulch to
prevent erosion and facilitate ground recharge
5. Please provide an explanation of the following:
(1) The practical difficulties or hardships that would result from the strict application of this Rule.
The buildings are existing and were built prior to the Neuse River Buffer rules. There would be
no way to extend the decks without a variance.
(2) How these difficulties or hardships result from conditions that are unique to the property
involved.
The situation is unique because the buildings are existing and we
(3) If economic hardship is the major consideration, then include a specific explanation of the
economic hardships and the proportion of the hardship to the entire value of the project.
The decks are all being extended in an effort to renovate and reuse existing structures. This will
reduce the need for future developments to use up green space. The lots without extended decks
will be at a distinct disadvantage and will be harder to sell.
Part 3: Stormwater
Variance Request Form, page 3
Version 6 July 2009
Provide a description of all best management practices (BMPs) that will be used to control
nutrients and sedimentation impacts associated with the proposed activity. Please ensure to include
all applicable operation & maintenance agreements and worksheets for the proposed BMPs. Also,
include the BMPs on your plan sheets.
We are not proposing any structural BMPs as our impacts are only 365 SF of decking with mulch
underneath.
2. Attach a description of how diffuse flow will be maintained through the protected riparian buffers.
Please ensure to include all applicable operation & maintenance agreements and worksheets for
the proposed diffuse flow measure(s). Also, include the diffuse flow measure(s) on your plan
sheets.
We are not proposing any adjustment to the current drainage patterns into the buffer. The decks
will not change the existing drainage patterns.
3. What will be the annual nitrogen load contributed by this site after development in pounds per
acre per year without structural BMPs (stormwater pond, wetland, infiltration basin, etc)? Attach a
detailed plan for all proposed structural stormwater BMPs.
Drainage Size of Post-development BMPnitrogen6 Final Final
basin drainage nitrogen 6 loading removal nitrogen6 nitrogen6
basin rate without BMPs4 efficiencys loading rate loading
(ac) (lbs/ac/yr) (%) (lbs/ac/yr) from
drainage
basin (lbs)
1 1.68 9.79 NA 9.79 1.59
2
3
4
5
Totals ------ ------
` Attach calculations and references.
s Attach calculations and references.
6Include Phosphorus in the Tar-Pamlico Basin
4. Attach all applicable supplement form(s) and Inspection and Maintenance (I&M) Form(s) to this
completed application. The applicable supplemental form(s) and I&M form(s) for the proposed
BMPs noted in your application can be downloaded from the following website:
http:/A12o.enr.state.nc.us/su/bmp fo is.htnl
Variance Request Form, page 4
Version 6 July 2009
Part 4: Proposed Impacts and Mitigation
Provide a description of how mitigation will be achieved at your site pursuant to 15A NCAC 213.0242
for the Neuse Basin and 15A NCAC 213.060 for the Tar-Pamlico Basin.
If buffer restoration is the method you are requesting, be sure to include a detailed planting plan to
include plant type, date of plantings, the date of the one-time fertilization in the protected riparian
buffers and a plan sheet showing the proposed location of the plantings. A guide to buffer restoration
can be downloaded at the following website: http://w w .neeep.net/ne s/reports/bgffers.pdf
If payment into a buffer restoration fund is how you plan to achieve your mitigation requirement, then
include an acceptance letter from the mitigation bank you propose to use stating they have the
mitigation credits available for the mitigation requested.
Part 5: Deed Restrictions
By your signature in Part 6 of this application, you certify that all structural stormwater BMPs
required by this variance shall be located in recorded stormwater easements, that the easements will
run with the land, that the easements cannot be changed or deleted without concurrence from the State,
and that the easements will be recorded prior to the sale of any lot.
Part 6: Applicant's Certification
I, Craig Briner (print or type name of person listed in
Part I, Item 2), certify that the information included on this permit application form is correct, that the
project will be constructed in conformance with the approved plans and that the deed restrictions in
accordance with Part 5 of this form will be recorded with all required permit conditions.
Signature:
Date:
Title:
Managing Member
Part 7: Plan Sheets
Be sure to include a copy of all of your completed application form, plan sheets and maps in Adobe
(pdf) format on a CD or floppy disk.
Variance Request Form, page 5
Version 6 July 2009
Part 8: Checklist
A complete application submittal consists of the following components. Incomplete submittals will be
returned to the applicant. The complete variance request submittal must be received 90 days prior to
the EMC meeting at which you wish the request to be heard. Initial below to indicate that the
necessary information has been provided.
Applicant's Item
Initials
EFS • Original and two copies of the Variance Request Form and the attachments
listed below.
_EFS . A vicinity map of the project (see Part 1, Item 5)
_EFS . Narrative demonstration of the need for a variance (see Part 2)
_EFS . A detailed narrative description of stormwater treatment/management (see Part
4)
_EFS . Calculations supporting nitrogen (phosphorus in the Tar-Pamlico Basin)
_EFS loading estimates (see Part 4)
• Calculations and references supporting nitrogen (phosphorus in the Tar-Pamlico
NA Basin) removal from proposed BMPs (see Part 4)
• Location and details for all proposed structural stormwater BMPs (see Part 4)
NA
• Three copies of the applicable Supplement Form(s) and I&M Form(s) for each
EFS
BMP and/or narrative for each innovative BMP (see Part 4)
_
EFS • Three copies of plans and specifications, including:
EFS 0 Development/Project name
EFS 0 Engineer and firm
EFS 0 Legend and north arrow
EFS 0 Scale (1" = 50' is preferred)
EFS 0 Revision number & date
NA 0 Mean high water line (if applicable)
_EFS 0 Dimensioned property/project boundary
_EFS 0 Location map with named streets or NC State Road numbers
_EFS 0 Original contours, proposed contours, spot elevations, finished floor
elevations
NA 0 Details of roads, parking, cul-de-sacs, sidewalks, and curb and gutter
_EFS 0 Footprint of any proposed buildings or other structures
_EFS 0 Wetlands delineated, or a note on plans that none exist
_EFS 0 Existing drainage (including off-site), drainage easements, pipe sizes, runoff
calculations
_EFS 0 Drainage basins delineated
_EFS
EFS 0 Perennial and intermittent streams, ponds, lakes, rivers and estuaries
_ 0 Location of forest vegetation along the streams, ponds, lakes, rivers and
estuaries
Variance Request Form, page 6
Version 6 July 2009
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/ ~ / / \ \ r V ~ 1 r , ~ J
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~ \ ~ ~ C ~ ~r i rr r rrr ri y1/M"'"' ( rr T 54 i C ~ ~ , % i~ UNDISTURBED BUFFER AREA: 8,912 SF / 0.205 AC, Z U
\ 1 % NCR r , WM / ~
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~ , ~ ~ , r ~ IPF c ~ , I I d' I ~ r / I I I
v , ~ J , WM ~ 41 r NO
ii ~ / XISTIN CLOSET ~ _ - 51 ~ r 1 SI ~ ~ E G r ~ r ~ , WITH ROOF ~ ~ ~ ,IP,S ® q(K-.,, ~ ! ~ I j ~ ~ ' 1 ~ 1 / ISSUED: , / I ~ ~ LEGEND: / 22 SEPT 2009
I ~ ~ ~ 51 ~ ~ , t ~ r IP~~~,_~ i .rte / J 51 ~ , r ~ r _ A N I ~ ~ i l ~ l ~j ~ IPS 3/4" gPEN TOP PIPE SET
; r, Lot 11 ~ r - 1 r ~ r , ? I Ij ~ / ~ I I ~ ~ ~ O~ IPF IROA~ PIPE FOUND
I ~ ~ / ' ~ (p r~ ! IBS r 59 r`~ ~ ~ ~II~ ~ \ N 86'12'09" IPF Lot 1 , , , _ r W ~ I 1 ~ ~ ~ ~ ~ _ _ 85.45 T1~ L ~ I\ ~ r I ~ ~ ; ~ I + ~ I+ I I I mo! I u O CC CA~/CULATED POINT
NCGS M0~IUMENT FIVE POINTS ~ ~ _ ~ ~ ~ J cr7 r ~ + h'`` ~ i ~ ~ ~ ~ _ - \ ~ +r,,~ ~r; Lot 13 ~ ~ ~ r ri ~ + W ~$jr r~
(PIN#EX6~50) NAD 83(2001)/NAV9 88. % ~ ~ ~ _ _ _ ~ ~ Lot 14 r 52 ~ ' ' + ' v I I r i II I I I I I f pi STRE~T ADDRESS
NORTH; 7147672,81 EAST; 2105044,.0 / ~ ~ ~ - t, ~ r r `.r, `.t., r r X62 + r f~~~, ~ ~ rtP~-- - '`r~`. Lot 15 , 1 1 r r , ELEVATIOryh 320, ; ' i ~ - _ _ ~5 r ` rN L63 + ~~6 '~j~ J ~ I ~ I ~ r1 WM~ V~ATER METER
~ ~ _22 _ 0 Lot 16,x. r 52 52 r M INE FA T R; 0, 99991 1 _ _ - 0 _ ~ r 1 r ~ r ~ COB DI C 0 ~9 ~ , d~ - ~ - L4 ~ ~ t J 3! rr-'r II I I I I n
i ~ ~ ~ r'~ ~ ; ~ ~ - EXISTING DECK ~ ! `'Z:~. / R7 ~ / I I I I J/J J d `,r~ /WATER VALVE
~ ~ ' - - - ~ 48 ~ ~ ,1 ~ 'tr cn r Cb 52 _ ~ ~ 5 `j ~M L65~ ,/1L I `I P I /l ~/"I~1 FIRE HYDRANT
~ _ B , ~ 1~ r I ~I ~j ~ ~ ~t ~ CURB INLET
B I ~ ~ - _ - _ ~ ~ L4 0 ' ~ I ~ Lot 17 ~ I i / 'i~ _ _ _ 6 ~ r ~ I l ~ ~ ~ ~ _ ~ - _ _ 5 ~ PF J ~ l ~ 53 rr 53 ` j / I / I ~ ~ jl 1 ~ / ~ UTILITY POLE ~ rr ~ / I I~ ~ q 1
i ~ ~ ~ ~ ~ _ ~ ~ ~ E ~ , r ~ Lot 18 1 ~ ,o, - ~ - ~ 93r° ~ r ` Lot 9 J IN , / ~ I r ~ ~ ELECe ELECTRIC BOX
4 w t~, N v ~ R T~ ( ~ ~ i ~ _ R oo/ IPF ~ Lot 2 ~ ~ r I / 1 / + 5~ I ~ / +r 4 TRANSFORMER r
E R~ 43 IPS ~y. of L1 J t 21 ~ r+ / / ~ !~r r / ~ I I ~ / ~ ril ` T ~ TELEPHONE RISER ~
' ~ I ~ ~ ' , _ _ _ _ (ING r ~ - ~ _ _ ~ / _ ~ 1 _ ~ W ' ~~~J ~~~J ` / + / v ~ I ~ ~ / ~ ~ / / rCB CABLE RISER
`r~. I ~ ~ - ~ ~ ~ ~ o _ ~ ~ Lot 2 Lot 2~ Qst 23 ! I -J j / , / / ri ® MAIL BOX /
/ ~O / ~ LIGHT POLE / (C) Copyright 2009 r
/ ~ ` ~ r ~ `~Z~J / ~ ~ ~ I ~ rr HW-SW HEADWALL (W/ SPILL WAY) ?his dc~cunnent Ord the
~ ' ~ h`~, ~ ~ ~ ~ ELE o _ ! F~ f-.~ r ~ ~ l „ / design are The proper ly o? ~d ~ I ~ ,r HW HEADWALL ~ , ~ ~ / ntegrated Design, f'A.
F ; / / ~ ~ 2 p / ~ ` r ~ ~ ~ rr / Any reproduction withcul
/ ~ C1- ~ ~ ~ ~ o~ ~ 4 v T y ~ ; ~ ~ 8' ~ ~ v C0~lMON CB® , ` prior written consent ~ r ~ ' ~ ~ 1' ~ / / I'
N ~ ~ ~ v ~ 1 Cyq ~ v ! 1 ~ N AREA ~ 2
~ ICJ Dw c algid for 34x22 plr>is cor l t., ~ 1 / TWE WHITAKER CONDOS COTTAGES. L~L~C g
N ~ ~ ~ A V ~C A \ ;.[l I y ~ v ' ~ _ ~ WAKE COUNTY v v ~ V' ~ , I ~ ~ ~ ~ ~ i DB: 11595. PG. 231 /
~ y y v 1 ~ v ~ % ~ ~ ~ ~ ~ DB:128 ,PG.2649 I I ! + ; rn I 1 ~ i I i EXISTING 1 ~ ~ PIN#1705-91-6265
i ~ ~ v\ ~ , ~ ~ ~ ~v - f 1 ~ 1 r r ~ , 1 IMPERVIOUS 1 ~ / / ! ZONE: R-10 /
~ , , ~ ~ ~ PIN~170~ 91-2122 I \ ~i v ~ / I t ~ / SURFACE
g ' ! ~ _ ` 2~ ZONE: R-10 I , _ _ \ + , , / / /,r~ ~ PLAN
/ _ ~ v I ~ ~ ~ ` ~ / / ^ ~ ~ ~ ~ Sri 1
W ~ \ ~ THIS PROPERTY IS LOCATED IN A SPECIAL FL000 HAZARD ZONE I ~ ~ / ~ 1 ~ 1/ / F i , E,~ S T I N G I M P E R V I O U S ~oB cooE: MCTH
W \ PER FLOOD INSURANCE RATE MAP (F,LR,M,} 37201170500J, 1 l r ` ri / i,
~ ~ v FFECTIVE 5 2 06. 1 I ~ ~ v 11 I 1 ' ` ~~UR~ACE PLAN 1~ ~~EXISITING '1 ~
v ` I ~ 1 ~ v v I I I
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~ I V I ~ ~ ~ I ~ I t
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2 3 4 5
' STORK F STORM RUNOFF CALCULATION.. _ - p
LINE TABLE LO~~NUMBER ADDRESS P1N NUMBER OLD AREA SF, NEW AREA SF, N ~A N / (SEE ST( (SEE STORM DRAINAGE DESIGN CAZCtfLATIONS) / ~ ~~P~~~~tE Cti P
I LINE LENGTH BEARING LINE LENGTH BEARING ~ 55 1705-91-4528 987.9 SF 1016.6 SF DES Lot 1 0 0 J DESCRIPTION ~ AREA CN l S Q / Q10 ~ w~`~° c°~$ ~
L1 53,51 Ni6'05'44"E L43 19,00 N73'49'S6"W 1. ALL MATERIALS AND METHODS OF CONSTRUCTION SHALL BE IN ACCORDANCE WITH THE PRE-DE1 PRE-DEVELOPMENT ONSITE ~tJNOFF 1.68 AC 79 445' 4.7~~- ' 4.63cfs 8.72cfs " CERT. N0.
L2 19,00 44 1 LOt 2 25 X1705-91-4528 728:0-SF 749.1 SF CITY OF RALEIGH AND THE STATE OF NORTH CAROLINA STANDARDS ANO SPECIFICATIONS. J UN[ S73 53 37 E L 3,90 N73 49 56 w ~ _ - 0 UNDISTURBED \ ` ~ - 0 2-1- AC 55- - -
MAP L3 14,00 S73'S3'37"E L45 14,00 N73'49'56"w Lot 3 25 1705-91-4557 745.0 SF 987:$ SF 2. CONTRACTOR SHALL HAVE NORTH CAROLINA ONE CALL {1-800-632-4949) LOCATE ALL J IMP MANAGED OPEN SPACE 0.79 AC 69 a 51063 z° OQ.. ~ . IMPERVIOUS 0.68 AC 98 ~
L4 1$,50 $73'53'37"E L46 14,00 N73'49'S6"W EXISTING UTILITIES PRIOR TO BEGINNING CONSTRUCTION. / ~ i ~CN ~ • yO~rh CARO~'\~
L5 53,50 $16'05'39"W L47 14,00 N73'49'56"w Lot 4 25 1705-91-4598 754.0 SF 783,0 SF ~ DE. L6 18.50 N73'S4'21"W L4$ 14,00 N73'49'S6"w 3. CONTRACTOR SHALL VERIFY THE LOCATION AND DEP1H OF ALL EXISTING UTILITIES AND / POST-DE DESCRIPTION AREA CN L S Q~ Q i 0 F~<< ~Q G_
L7 14,00 L49 14 " Lot 5 54 1705-91-5507 728.0 SF 749.0 F UN[ N73'54 21 W ,00 N73 49 56 w D ~ NOTIFY THE ENGINEER OF ANY DISCREPANCIES OR CONFLICTS PRIOR TO BEGINNING / POST-DEVELOPMENT ONSITE RUNOFF 1.68 AC 80 445' 4.7% 4,83cfs 8.96c~s pP SITE R~ '~~EIGH,N UNDISTURBED 0.21 AC 55 0 ~ ~
CONSTRUCTION. / MAP L8 19.00 N73'S4'21"W L50 19,00 N73'49'56"w Lot 6 54 1705-91-5517 987.9 SF 749,0 , MANAGED OPEN SPACE 0.73 AC 69 4.1% 2Tl% ~~v ~ ,,11`~I~','I`'/~,~
" 0 IMP L9 53,51 S16'05 39 W L51 56,95 N16'0719 E ~ IMPERVIOUS 0.74 AC 98 INCREASE CREASE ~~0 ~ _ ~ ~ o ~P
L10 53.50 $16'05'39"W L52 56,97 N16'05'39"E Lot 7 54 1705-91-5526 728,0 SF 749.0 S 4. BOUNDARY AND SURVEY INFORMATION IS TAKEN FROM A SURVEY 8Y SUMMIT COASTAL I ~ ~ ~ ~ ;~~~y ~ f y
Lll 54 SURVEYING ANO MAPPING TITLED RECOMBINATION SURVEY LOTS 1 - 24 WHITAKER ~ ,00 N16'O6 23 E L53 56,98 Sl6 05 39 W TOWNES PROPERTY OF GHC WHITAKER TOWNES LLC DATED 17 SEPT 2009. TOPOGRAPHY /
• " ~ Lot 8 54 1705-91-5535 754,0 SF 674,3 SF ~ / L12 14,50 S73 53 37 E L54 56.99 N16'05 39 E
L13 10, 50 L55 7 TAKEN FROM~WAKE COUNTY GIS, / S 8 ~ o~ 6 ~ 5 ~ E 4 2 , 5 7' S16 O6 23 W 5 .00 S16 05 39 w Lot 9 50 1705-91-2499 1062,8 SF 1081.3 SF 4 2.5 7' 1( ~ ~ ~ I
L14 14,00 $73.53'37"E L56 57,01 N16'05'39"E 5. -ALL CONSTRUCTION ALL CONFORM TO A.D.A. STANDARDS. ~ ` ~ ~ i - L15 14,00 S73'S3'37"E L57 57,02 N16'O6'21"E Lot 10 50 1705-91-3419 783,1 SF 794.6 SF .dJ l ~ \ ITgKER M1LC RD (gin
_ 0 0 = ' " ' " 6. PROPERTY LINES SHOWN ON THIS PLAN MATCH THE PROPERTY LINES SHOWN ON THE ' s%'r " L16 4,00 N16'06 23 E L58 57,28 N16'06 21 E ~ _
17 14 Lot 11 50 1705-91-3428 783J SF 798.1 SF RECOMBINATION PLAT SUBMITTED TO CITY OF RALEIGH FOR APPROVAL ON 18 SEPT 1009 ! ~ ~ _ L .00 S73'S3'37"E L59 19,00 S73'53'S7"E ~ .F _ ~
, " ~ ~ _ _ Cl$ 11.00 N16'06 23 E L60 14,00 S73'53 57 E 50 1705-91-3438 783.1 SF 798.1 SF + i'~ ,;Y, - - ~ Lot 12 0 0
L19 ~ , 14,50 S73'S3'37"E L61 14,00 S73'53'S7"E J ' - - i''"~ ~ IPS ~ - ~ _ ~ - JPF ~ _ 6'Q' ~ f VICINITY MAP o a0 I 1 ~ ~ o ~ ~ E
• " " 50 1705-91-3457 783.1 SF 798,1 SF ' L20 46,50 S160623 W L62 14,00 S73'5357 E Lot 13 0 0 1 I I 1 1~ I ~ ~ ~ ~j~/ ~ I ~ CO CON ~ ~
63 00 I o „ L21 14.50 " L 14. " N73'S3 37 w S73'S3 56 E 51 1705-91-3461 783.1 SF 798,1 SF I _ - _ Lot 14 0 0 ~ N$2Z 05E 'Z~,'05"E 4.63' ~ ~ ~T, , ~ N ~ N u z, ~ ~ ~ ~ I ~ ~ N
L22 4,00 Nth 06 23 E L64 14,00 S73 53 57 E , ~r , ~ , , - L23 ta,00 N73'53'37"w L65 14.00 S73'53'56"E Lot 15 51 1705-91-3467 778.6 SF 792.8 SF I - i i i I I ~ ~ ~ ~ 1u `i PRE-DEVELOPMENT NI~ROGEN LOADING a~ z °O o0• °
0 0 _ I - , , I L24 4.00 S16'O6'23"w L66 14,25' S73'S3'57"E ' ' ~ ' - I ~ I ~ E X. W ~ ~.P ~ i rn rn I W
14 7 LOt 16 51 1705-91-3496 1064,8 SF 1082.8 SF ' N63 20 03 E 42.38 ~ COMMON L25 ,00 L6 50,k ~ 0 0 N73 53 37 W Slfi O6 22 W I ~ ~ IPF I C OI~M ON ~ ~ 48' ~M P ` ~ y~ ~ SITE TN EXPORT TN EXPORT TN cXT'ORT r-- Q' ~ ~ 7 I p TYPE OF I ^~3000VER I AREA COEFF. BY LAND USE FROM SITE T N 3
L26 14,00 N73'53'37"w L68 1~. g N73'30'S0"w , I AREA I i ~ o f » f S; '~{I~ \ (ACRES) (LB/AC/YR} (LB/YR) (l6/AC/YR) ~ p X ~ ARE~~A ~ I ~68 d9 3 , ~ 49.67 ~ ~ ~
. „ Lot 17 52 1705-91-4445 1064.2 SF 1088.6 SF , , ~ I p L27 1 ,00 S16 06 23 w L69 1 Ni 6 07 58 E r ~ I ~ I, I I I ~ ! ' ~ ~ u pERMANENTLv RVFO UN0137UR ED I
L28 14; 0 N73'53'37"w L70 1~ ~ ,7 N73'56'32"w 1 g 52 1705-91-4as4 741,1 sF eo1.6 sF I i' ! M~ PROPOSED I Lot ~ ~ D , 1 ` PBpI SPACE ( . ~ yt UNMOWN ME~DOW) 0 O.B 0 _ i ~ ~ ~ ~ I1
L29 a3,5b~ S16'06'23"w L71 3.~~0 N16'03'28"E I ~ ' , ; " . 52 1705-91-4474 783.1 SF 801.5 SF ~Y ~ / ~ . 10X1 ~ DECK , 7 14 `,7 Lot 19 ® D D f - ~ D~ r, , 1 ~ p PERMANENTLY'rR LRVE~n MANAGEyD
L30 53.50 ~ S16 06 23 w L 2 N73'56 32 w ~ ~ ; m ADDi TION TYP " , h TB t ) + L31 49,50 546'06 23 w L73 14 ~ N73'S6 32 w I , . ~ r ~ , I ~ I ~ ~ ° ~ ~ OPEN SPACE (GRA,.LAMDSCAP NG, ETC) 1.00 , .2 9.20 `
, " LOt 20 52 1705-91-4483 783.1 SF 801.3 SF , i ~ 'V r M ®@ i L32 42,50 516'0$'23"W L74 14..) N73'S6 32 W I/ CB , I j ~ Z ~ ~ / IMPERVIOUS SURFACES (RnnDS, PARKING o~
i ~ 6 94 L75 1~~' J ' " 52 1705-91-4493 783.1 SF 801,2 SF ~ ! Y r ~ti ~ IPS I L33 5 . N16'0719"E N735632 W Lot 21 0 0 , / 'lj ; ELEC ~ I F- ~ ' / i j I II LOTS, DRIVEWAYS. ROOFS, ''~VED STORAGE 0.68 21,2 14.42 i I~ I I I II AREAS, ETC)
L34 19,00 S73'52 41 E ~ L76 t . ~ N73'56 32 W , , / , 12 I ~ n
' " ~t " Lot 22 - 53 1705-91-5413 783.1 SF 801,0 SF ~'~r' o Q IPS ~2 / I i' 10 I L35 13,97 S73'S4 21 E 177 1 ~ ,1 N73'56 32 w ~ ~ ~ex1z ~
14 00 " U8 ~ 57 ~ " 1 ~3 _ _ - 21 _ ar ^ TB L36 S735241 E S164539 W Lot 23 53 1705-91-5422 783.1 SF 751.9 SF , ,a !okf? _ - , ~ ~ J I 0 0 II 1 h Ii rv II ~ ,y`~;' II ii ToT,u / 1,se ,s.62 ~
L37 14,00 " L79 57 5 "W ' \ ''FCk , ~ ~ ~ S73524t"E 5160539 PF ~ _ 1 ~4 ~~4 ~EL~C~ ~ ~ i I I ' II AVERAGjE~FOR SRE I 9.30
7.""4 ~ 53 1705-91-5442 1063.5 SF 718,9 SF , r , i ~ Dxi i ~ ~ ELEC L38 14.00 S73'S2 41 E L80 5 L $16'05 39 W Lot 24 ® 0 D ~ n , " i',4' i' i 1 ~ ,Okl ` r. ~ I ~ 15 L39 14,00 S73'S2'41 E L81 57,23 $`16'0539 W 1705-91-45 2 0 54 SF 5 146.5 5F CaMM~N/ tom. `pfCA? 1pa.1? C15 ~ c ~ I b' ; ~ I / ii ~
1 1 " L8z 57,zz " COMMON 3 53 9 , 0 , . ~ IPS cc L40 3,9 S73'52 41 E S16 39 W / ~R A 1 ^ ~ ~ 1 ° sF l ~ {
L41 18,97 L83 53,71 N1 ' 7 AREA 2522 MCNEIL % ~ E J , F`- ^ ~ °,cK ~r S73'52 41 E 6 05 ~ E / ~ CKSF' J ~ ~ ~ 1 iJ ; ~ ~ / tl i .
' - LINE J L42 57,04 5160441 W L84 50,43 N16'0539 ~ ~ ~oaD .,r~, Lot 4 1 ~ ~ / ~I ~ / SITE TN EXPORT TN EXPORT TN EXPORT .~ENCA~ED /PIPE X ( TYPE p; LANOCOVER AREA COEFF. BY LAND USE FROM SITE
' ~ 1~ F r o . ~ ' ' FFMA ~ - ,y~ o, ` i1 _ ~ $F ` ` x~ ; ~r ~ / (ACRES) (LB/AC/YR} (LB/YR) (LB/AC/YR) ~
' i' i' i / _ _ --1- - r . n "~c.Tf , ~ II - ` i J/ i li ~ N i pERMANENTLY PRF RUED UNDISTURBED
. . / .r ~ / I PROPOSED SITE DATA: ~ ~ _R~ + , ~ rn ~ . ~ Lot 5 ~ / ~i r ~ r J V LOt 3 ri ~ 55 r L lg h/-y ' ~ OPEN SPACE (FC~s :,i, UNMOWN MEADOW) 0 0.6 O
I T ~ '~f i ~~I , ~ ~ I ~ ` /II PERMANENTLY PRF ;ERVEI} MANAGED
TOTAL SITE AREA: 73,114 SF / 1,68 AC, , ~ A/C~ , r LOt 2 rrJ i ~ r. N r + ~ LOt 6r ~ , /r r ~ wq J , r 55 r v I O ~ ~ i ' i ' ` II OPEN SPACE (GRA ,S, LANDSCAPING,' ETC) 0.44 , .2 1.13 II
C r ~ rl NEUSE RIPARIAN BUFFER (INCLUDING PARCELS): 18,837 SF / 0.43 ~~C. ' / ~ ,c„ C + r ? ^ ~ ~ ~ ~ y I r 55 rl , r I Lot ~ , ~ A'S ~ ? ~ i ~ ~ / N J ~ ' II IMPERVIOUS SURFACES ROADS, PARKING ~ I Lot ~ (
WM YH ! i - , ~ 4~ '1 IP ~ r ~ '1M. RVI RFA E 32 423 SF 0,74 AC i o ~ r ~ 55 U + r~ ? , PE OUS SU C S [ / ] ~ , , , ~ T , ~ ~ I \ I ~ ~ i ` II LOTS, DRIVEWAYS, R' .,IFS. PAVED STORAGE 0.74 21.2 15.69 i I ~ ~ N AREAS, ETC) ~ ( J
~ / i ~ ' , rl , ! r Y'~ I ~
PARKING AREA /SIDEWALK: 16,849 SF / 0,387 AC. ~ / > - ~ _ Ir V~`~r r J r ~ 4 1 J ~ J Lots ~ 1 I= , 1 I I ~ ~ Q
~ ~ / ~ 6 d J 1 r~~. BUILDINGS, PORCHI=S1 PATIOS; 14,649 SF / 0,336 AC. ~ , / ~ \ r ~ ~ I ~ . ~ TOTAL ~ 1.68 18.82
~ ~ ' rJ J r ! ' 54 ~ 8 5 54 I`~i ~ I ii - ~ ~ Q JI N V \ V , DM ~ AVERAGE FOR SRE 10.01 ~,LJ Z
CKS~ 805 SF 0.0185~C:~. ' / ~ ~ ~ r ~ I DE / ~ ~ ~ ~ r ~ ~ NOTE: ~ ~ ~ , ~-f
DUMPSTER PAD: 120 SF / 0.00275 AC,, , ~ BUFFER PERMIT FROM coN ~ ~ + WM r r ~ ~ 54 ~ IC ~ 7D~/ II ~ ~ ~
C ~ , ? ~,OR~ _ e ! r ';yJ r I ' ~n ' ~ / ' ~ S/ r l~~, << -1'__f ~21i-,~; ~ m ~ ~ „ PdST-DEVELOPMENT NITROGEN LOADING (APPORTIONED a Z Q
P RVI RFA E 40,691 SF 0,94 AC ~ ~ ~ ~ - ~ 0 `,.r ! j E oUS SD ~ S [ / ] , , ~ NCDENR REQ D PRIOR ~ , _ Ew r ~ 7• _ _ U
pp I ' ~ T~ r UNDISTURBED BUFFER AREA; 8,912 SF / 0.205 AC. ~ ~ _ _ _.TQ1~7DT~~NIN~j BLDG J i ' " ` ~ 1 -Q i I ' I ~ _l / SITE TN EXPORT TN EXPORT TN EXPORT L` I P,'~ ~ I Z ~ I ~ TYPE OF LANDCO'VER AREA COEFF. BY LAND USE FROM SITE
1 ! _ V r~ ~ r , - - PERMIT FOR DECKS _ ~ _ ~ I ` ~ / / (ACRES) (LS/AC/YR) (LB/YR) (LB/AC/YR} W f-
LAWN /LANDSCAPE: 30,974 SF / 0,711 AC. , c / IPF I ~ I , , ~ = 'y, ` I 1 1 I Z I ~ ~ ~ i / I ~ PERMANENTLY PRESERVED UNDISTURBED ~ E+-~ Q 1 Z ' ~ 'I I Z ~ r ~J OPEN SPACE (FOREST, UNMOWN MEADOW) 0 0.6 O Q ~ ~ Z
~ ON LOTS 7,8 & 23. I DECKS: 805 SF / 0.0185 AC. ~ ,f / ~ ~ COMMON ~ I I ~~~~j E ~ ~ 1y ~ I~ I I , I m + rl PERMANENTLY PRESERVED MANAGED ~
~ ~ i / , ~ I ~ ~ ,'i IPS ~3~ 1 ~ - AREA ASp ~ ~ I ~ I I I ~ j ~ , / I 3j OPEN SPACE (GRASS, LANDSCAPING, ETC} 0.08 1 2 0.10 m
~ , r~ ~ HA ~ I NOTE: DECKS ARE 50~ IMPERVIOUS; 50% PERVIOUS ~ ~ r , (T A m I _ ~ , ~ X35 r ~ ~ q~k I ~ I y '?7 ~ I r1 ~ (0.06/0.74} 0.94 - O.D9 Ac ~ Z J Fr1 I I ` m W ~ ~ ~ i ~ I II
50~ 1610 SF - 805 SF ~ ~ COMMON ~ . ~ ^ LNG NEW 10X12 CONC y/ , ~ o ~ I 11 ~ ~ ( I ~ ~ l ~ I 11 IMPERVIOUS SURFACES (ROADS, PARKING J Z J
~ ~ AREA , `~y--. 1 ( ; ~ DUMPSTER PAD I -IJ I 1 ~ I N I fT'1 ~ I II LOTS, DRIVEWAYS, ROOFS, PAVED STORAGE 0.06 21.2 1.27 ~ ~ Q ~ ~ I ~ I I ~ ~ j ~ AREAS. ETC) ~ ~
~ ~ ~ wM, 3~ I ~ ~I o ~ ~ r ~ ~ ~ ~ ~ ~ ~ r + 50 5o rl.' ON L''X1,ST GRAVEL PAD - I c ( ) ~ r ~ 3 r ~
r r 8 ~ ~ D r / ' ' ` C ~ ~ EXTEND TO PAVEMENT EDGE ~ + f 3 r ~ ) D i I I ~m I I I ~ ' /i W Z r i~ I I t ~ I I Ir j I I i
~ EX1~T DECK TO / ,Lot 9 9, - ~ ~ ~ / r Lot 10 50 5 ~ + 40r , ~ ~ , r 1 1 r e ~ ~ ~ I I ~ ! roTAL o,,4 ,,37 ~ DWG BY: SRN
REMAIN (TYP) IPF , c + I .,;I , I ~ d' t ~ I I I ~ ~ I AVERAGE FOR SfTE I 79
V? m ~ ~ I I ~ CHK BY: EFS
~ / % PORTION OF EXIST DECK ~ ~ ~ - ~ of q~ ~ , ~ I I I I~~ I
~ ~ TO BE REMOVED T ~ ~ J ~ 51 r r ~ , ~ , , I P~ I 11 I ~ NUTRIENT REMOVAL SUMMARY: ' ~ II / II I I I ~ ~ ~ (SEE "DESIGN GALCULATIONS: STORMWATER DETENTION AND NUTRIENT REMOVAL ANALYSIS" REPORT) ISSUED:
~ ~ Lot 11 ~ ~ , ~ , - ~ ~ U? r + J 150 ~ ~ 1 m I
• ~ ~ ~ ~ ~ N ~ " Lot 1 to r fbS J 1 s''~ I ~ ~ 66'1209 W 89.45'71 ~ IPF ~ n r ~ r r r + ~ ~ I q I ~ I I I Q/ <<~__ 22 SEPT 2009 ~ REQUIRED PAYMENT TO NC EEP: (9.79 - 3.6 LB/AC/YR)(0.14 AC)(f850.50) _ (737.04 I I J ~ ` 11 PAYMENT TO THE NCEEP MEETS THE CITY'S STORMwATER NITROGEN REDUCTION REQUIREMENTS.
NCGS MONUMENT FIVE POINTS / _ _ _ _ ~ 1z ~ ~ ~ ~ , . , I - _ _ _ ; ~ sx, i Lot 13 ~.r J ~ r ~ ~ / / 7~5k1 ' J ? ! W 6j nom-. I ``'I ti~1 I ~ I I , II
(PIN#EX6~50) NAD 83(2001)/NAVD 88, / ~ - _ ` _ •>'4no+~ - Lot 14 r 52 ~ ! + NORTH; 7147672,81 EAST; 2105Q44,©8 ~ ~ _ - r, 'a:' •1' ~ r r f , ~s2 ~r ; _ + III I I I I~ WE ARE SHOWING BOTH METHOD 2 AND THE APPORTIONED METHOD TO HELP CLARIFY CALCULATIONS. I ' I I I I I jj WE ARE USING THE APPORTIONED METHOD BECAUSE OUR EXISTING PROPERTY INCLUDES LARGE EXISTING
~ - - NEW 12.5X14- CONS - ~ ~ , Lot 15 r . r ' , ~ ELEVATION; 320, Q% ~ ~ ~~0 ~ ;ag5xr+, LOt 16 , 4 6~ r.'r _1 ~ 1 ' i 1 I I i J' I „ IMPERVIOUS AREAS. 1 ;~~~~,r~~ ~ I I I I ~ LEGEND:
, ~ ~ PATIO TYP s~, > nD 'd' i 52 52 r r _ - ~ ~ r 1 M I FA T R 99$91 1 _ _ - _ - . r ~ r CO BNEDI C 0 . 0, ,89 , - ~ ~ _ C4 ~ ~t' r
I / / ~ L ~ ~'S ~ skr . r ~r ! 47 52 HVM ~ I 1 ~ L6 ~ r PSi j ~ ~ IPS 3/4" OPEN TOP PIPE SET YVM ~ S , ~I `1 ~l_ _ ~ I m ii
/ ; 'i ~ $ ~ j , Ano ~ . ~ ,
-L~ I' ~~L~.. /JC661 `~-'I ~I~ ' ~I ~ it O IPF IRON PIPE FOUND I , U ,r
/ / / % 4` ' - _ ~ ~ `"h :~°,~o r ~pA~sk14~ . i r Lo t 17 J ~ 1 ' / / ,i ~ ~ - _ - ~ 4 0 ~ 53 / _ _ _ PF ~ I / = 5 ^ ~ _ of 1 1~~ 53 / ~ }w~ /l I ~ ~ ~Ir OO CC CALCULATED POINT Jet 1 p Jc~ I~ ~ ti q STREET ADDRESS
/ , ~ ' ~ _ _ ~ ~ ~ 4b9 Lot 19 ;
_ i ~ - - - ~ / rry - - ~ - Rip ~'~-~..,?8 IP Lot 20 1,,,.., l I ~ / N ,I / ~ j ~ ~ j~ ~ W II ~ y+y~,~~ WATER METER
/ , n ~ IPS ' ~ . ~ ro c,~' - - ~ R~rA~ 1 p4np14r of ,~1 + d- i d- ~ ~ I ~ ~ ii WATER VALVE
~ i9~ u /
~ ~ 0 ~ ~ ~ rzs'' ~t 23 . , ~ ~ ~7 .p~~+,~_~ P~ x14 Lot 2 dt 23 /,Irr ° ii ~ ~ ~ FIRE HYDRANT
/ ~ ~ ~ ~ nD ~ na l w ~ ~ ~~t 24 ~ ~ / ~I / ® CURB INLET ,I /
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09°1022
NOBLE TOWNES
NOBLE ROAD
AND
MCNEIL STREET
RALEIGH, NORTH CAROLINA
DESIGN CALCULATIONS
STORMWATER RUNOFF AND
NUTRIENT QUANTIFICATION
JOB CODE: MCTH
22 SEPT 2009
SEP 2 4 2009
DENR • WATER QUALITY
WETLANDS AND STORMWATM BRANCH
' Ai
s
2 S IF
INTEGRATED DESK
INTEGRATED DESIGN, P.A.
1111 OBERLIN ROAD
RALEIGH NC 27605 USA
architects engineers planners
TELEPHONE [phone]
TELEFAX 919 839 2255
MCTH
22 September 2009

Integrated Design
STORMWATER RUNOFF ANALYSIS - NOBLE TOWNES
RALEIGH, NORTH CAROLINA
EXECUTIVE SUMMARY
Noble Townes is an existing 24 lot townhome community that is situated on 1.68 acres in Raleigh, North
Carolina. Our client is renovating the interiors and exteriors of these townhomes. Part of the exterior
renovation includes increasing the size of the existing decks and adding patios. The purpose of this
report is to document the increase in impervious surface and runoff due to the new decks and patios
meets the requirements of the City's Stormwater Management regulations.
GROUND COVER SUMMARY
Parking Area
Buildings, Porches, Patios
Decks
Gravel Area
Dumpster Pad
Undisturbed Buffer
Lawn, Landscape
Total
Pre Development (SF)
16,849
12,024
1,192
200
0
8,912
33,937
73,114
Post Development (SF)
16,849
14,649
1,610
0
120
8,912
30,974
73,114
EXISTING AND POST DEVELOPMENT PEAK STORMWATER DISCHARGE
ON SITE DRAINAGE
PRE-DEVELOPMENT
_2 10
4.63 8.72
POST DEVELOPMENT
Q t0
4.831 8.96
(4.1% 2.7% Increase)
The proposed detention provides an overall reduction in storm water runoff. The following pages
document the methodology used to develop the stormwater management system.
NUTRIENT REMOVAL REQUIREMENTS
The proposed development is subject to the City's requirements for quantifing post development nutrient
loads. Portions of the site have existing impervious areas. The City `Apportioning Method' was used to
credit the existing impervious areas. The post development nutrient export load level is calculated at
below 10 lb/ac/yr as required by City Code. The proposed post development nutrient export load, after
taking the apportioning credit is 9.79 lb/a/c/yr. Payment to the Ecosystem Enhancement program in the
amount of $737.04 is required.
Integrated Design, PA Phone: [phone]
1111 Oberlin Road 1/3 Fax: [phone]
Raleigh, North Carolina 27605 www.id-aep.com
MCTH
22 September 2009
METHODOLOGY
Methodology described in Soil Conservation Service Technical Release No. 55, Urban Hydrology for
Small Watersheds (TR 55), was used to generate 2 year and 10 year storm hydrographs for this project.
Commercially available computer software, Hydraflow Hydrographs 6.02 by IntelisolveTM, was used to
generate pre-development and post development hydrographs.
DESIGN ASSUMPTIONS
The existing area is predominately composed of Cecil soils (CeC2) and manmade soils (Ma). Cecil soils
are Hydrologic Soil Group B soils. All Curve Numbers (CN's) were taken from Table 2.4 of the City of
Raleigh Storm Drainage Design Manual. Following is a summary of the CN's used in developing the
storm hydrographs:
Impervious areas CN = 98
Existing Woods CN = 55 [Woods, good cover]
Landscape & grass areas CN = 69 [Lawn, fair condition]
RAINFALL AMOUNTS
All hydrographs are based on 24 hour rainfall events. Rainfall depths for the 24 year storm were taken
from Malcom's Exhibit 2 and the U.S. National Weather Service Technical Paper No. 40, Rainfall
Frequency Atlas of the United States as follows:
2 year 24 hour storm 3.60 inches
10 year 24 hour storm 5.38 inches
TIME OF CONCENTRATION
Initially both the `Lag Method' and the SCS method of determining time of concentration were analyzed.
Both methods gave similar results; the `Lag' method was utilized for this analysis.
Integrated Design, PA Phone: [phone]
1111 Oberlin Road 2/3 Fax: [phone]
Raleigh, North Carolina 27605 www.id-aep.com
MCTH
22 September 2009
NUTRIENT REMOVAL
The proposed development is subject to the City's requirements for reducing the post development
nutrient loads. Portions of the existing site have impervious areas. The City `Apportioning Method' is
used to credit these existing impervious areas in the following calculations. This development is
proposing to provide a payment to the State's Ecosystem Enhancement Fund to meet City Code
requirements.
PRE DEVELOPMENT EXPORT EXPORT
COEFF LOAD
AREA lb/ac/ r lb/ r
Permanently Preserved Undisturbed OS 0.00 AC. 0.6 0.00
Permanently Preserved Managed OS 1.00 AC 1.2 1.20
Impervious Surfaces 0.68 AC 21.2 14.42
Total 1.68 AC 15.62
Average for Site 9.30 lb/ac/yr
POST DEVELOPMENT EXPORT EXPORT
COEFF LOAD
AREA lb/ac/ r ONO
Permanently Preserved Undisturbed OS 0.00 AC. 0.6 0.00
Permanently Preserved Managed OS 0.94 AC 1.2 1.13
Impervious Surfaces 0.74 AC 21.2 15.69
Total 1.68 AC 16.82
Average for Site 10.01 lb/ac/yr
POST DEVELOPMENT (APPORTIONED) EXPORT EXPORT
COEFF LOAD
AREA lb/ac/ r lb( /yr)
Permanently Preserved Undisturbed OS 0.00 AC. 0.6 0.00
Permanently Preserved Managed OS 0.08 AC 1.2 0.10
Impervious Surfaces 0.06 AC 21.2 1.27
Total 0.14 AC 1.37
Average for Site 9.79 lb/ac/yr
Multi-family residential developments must be under 10 lb/ac/yr and must be bought down to 3.6
lb/ac/yr via a payment to the NCEEP.
PAYMENT TO ECOSYSTEM ENHANCEMENT FUND:
(9.79-3.6 LB/AC/YR)*(0.14 AC)($850.50/LB/YR) = $737.04
Integrated Design, PA Phone: [phone]
1111 Oberlin Road 3/3 Fax: [phone]
Raleigh, North Carolina 27605 www.id-aep.com
Hydrograph Summary Report
Page 1
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(cuft) Return
period
(yrs) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(cuft) Hydrograph
description
1 SCS Runoff 4.63 1 719 9,757 2 ---- ------ ------ 2 YR - PRE
2 SCS Runoff 8.72 1 718 18,589 10 ---- ------ ------ 10 YR - PRE
4 SCS Runoff 4.83 1 719 10,185 2 ---- ------ ------ 2 YR - POST
5 SCS Runoff 8.96 1 718 19,156 10 ---- ------ ------ 10 YR - POST
Proj. file: MCTH-PRE-POST.GP OF file: Sample.IDF Run date: 09-17-2009
Hydrograph Plot
English
Hyd. No. 1
2YR-PRE
Hydrograph type = SCS Runoff Peak discharge = 4.63 cfs
Storm frequency = 2 yrs Time interval = 1 min
Drainage area = 1.68 ac Curve number = 79
Basin Slope = 4.7% Hydraulic length = 445 ft
Tc method = LAG Time of conc. (Tc) = 7.9 min
Total precip. = 3.60 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484

Total Volume = 9,757 cuft
1 - SCS Runoff - 2 Yr - Qp = 4.63 cfs
5
4
3
C'1
2-
1-
0
=F=
0 5 10 15 20 25
Time (hrs)
/ Hyd. 1
Hydrograph Plot
English
Hyd. No. 2
10 YR - PRE
Hydrograph type = SCS Runoff Peak discharge = 8.72 cfs
Storm frequency = 10 yrs Time interval = 1 min
Drainage area = 1.68 ac Curve number = 79
Basin Slope = 4.7% Hydraulic length = 445 ft
Tc method = LAG Time of conc. (Tc) = 7.9 min
Total precip. = 5.38 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Total Volume = 18,589 cuft
2 - SCS Runoff -10 Yr - Qp = 8.72 cfs
10
8
6
C'1
4
2
0
0 5 10 15 20 25
Time (hrs)
/ Hyd. 2
Hydrograph Plot
English
Hyd. No. 4
2 YR - POST
Hydrograph type = SCS Runoff Peak discharge = 4.83 cfs
Storm frequency = 2 yrs Time interval = 1 min
Drainage area = 1.68 ac Curve number = 80
Basin Slope = 4.7% Hydraulic length = 445 ft
Tc method = LAG Time of conc. (Tc) = 7.6 min
Total precip. = 3.60 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Total Volume = 10,185 cuft
4 - SCS Runoff - 2 Yr - Qp = 4.83 cfs
5
4
3
CY
2
1
0
0 5 10 15 20 25
Time (hrs)
/ Hyd. 4
Hydrograph Plot
English
Hyd. No. 5
10 YR - POST
Hydrograph type = SCS Runoff Peak discharge = 8.96 cfs
Storm frequency = 10 yrs Time interval = 1 min
Drainage area = 1.68 ac Curve number = 80
Basin Slope = 4.7% Hydraulic length = 445 ft
Tc method = LAG Time of conc. (Tc) = 7.6 min
Total precip. = 5.38 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Total Volume = 19,156 cuft
5 - SCS Runoff -10 Yr - Qp = 8.96 cfs
10
8
6
CJ
4
2
0
0 5 10 15 20 25
Time (hrs)
/ Hyd. 5
Nitrogen loading calculation for additions or expansions
Calculation of nitrogen loading for additions and expansions using the apportioning method. Under the apportioning method, the "area" associated with the new portion of
the development (the addition or expansion) is based on the area of the new impervious surfaces plus a portion of the site's remaining open space. The portion of the
remaining open space assigned to the new development is based on the ratio of existing impervious to new impervious surfaces.
Example: Assume a 10 acre site with 5 acres of existing impervious surface and 5 acres of managed open space
Assume an expansion to include 3 more acres of impervious surface is proposed
Assume 21.2 Ibs N / acre for impervious areas and 1.2 Ibs N / acre for managed open space
The calculation to determine the apportioned open space and nitrogen loading would be as follows:
Apportioned open space = (new impervious area / total impervious area) (remaining open space)
Apportioned open space = (3 acres / 8 acres) (2 acres) = (0.375) (2 acres) = 0.75 acres open space allocated to the new development
New nitrogen loading = load from new impervious surface + load from allocated open space / combined areas
New nitrogen loading = (3 acres new impervious)(21.2 Ibs N / acre) + (0.75 acres managed open space)(1.2 Ibs N / acre) / (3 acres + 0.75 acres)
New nitrogen loading = 63.6 Ibs N from new impervious + 0.9 Ibs N from apportioned open space / 3.75 acres = 17.2 Ibs N / acre
New nitrogen loading = 17.2 Ibs N /acre
Following is a spreadsheet that may be used to calculate the apportioned open space and new nitrogen loading for additions and expansions
Input the following information (in blue)
acres of existing impervious area = 0.68 acres
acres of existing managed open space = 1 acres
acres of proposed new impervious surfaces = 0.06 acres
The following are calculated by the spreadsheet:
Pounds of nitrogen from new impervious surfaces (Ibs) = 1.272 Ibs
Remaining open space (acres) = 0.94 acres
Apportioned open space (acres) = 0.07622 acres
Area associated with loading from "new" development (ac) = 0.13622 acres
Nitrogen loading associated with the new development = 10.0095 Ib/ac/yr
Total pounds of nitrogen assoc w/ new development = 1.36346 lb
Pounds of nitrogen required to be removed = 0.87308 lb
Pounds of nitrogen removed through BMPs = 0 lb
Cost for buydown = $742.56
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