20070081 Ver 2_More Info Received_20070730

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Letter ofTransmittal
AYES
To: `ti' C. ~V~1 C~
`~ V 1 ~ x ~ /2sS (fit;; ~ r i ~ ~ ~ i ~
Aiken & Yelle Associates, PA
Professional Engineers & Land Surveyors
3755 Benson Drive
Raleigh, North Carolina -27609
919-877-9992 Fax [phone]
e-mail: [e-mail]
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Date: ~ 3~
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Comments:

~kp o'1-~oBJ Y~
Aiken & Yelle Associates, PA
AYES Professional Engineers & Land Surveyors
3755 Benson Drive
Raleigh, North Carolina 27609
Phone: [phone] Fax: [phone]
July 30, 2007
NC Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Express Review Staff
2321 Crabtree Blvd
Suite 250
Raleigh, NC 27604-2260
Re: Cedar Ridge Subdivision PCN Submittal
Wake County, North Carolina
Dear Staff:
. .
_ ~ i .. .. ~~ .~1a4,
~~ .
We have modified the Cedar Ridge Drawings in the following manner:
1. We have provided class B riprap at the inlet to all bioretention areas. We have calculated the inlet
velocities at the end of each riprap section using HYDRAE software. For the 8" DWHCP inlets
we used a typical section of 2 feet wide with 3:1 side slope and used the Q1" flow. For the 15"
RCP inlets we used a typical section of 4 feet wide with 3:1 side slopes and used the Q10 flow.
The results of the calculations are attached to the bioretention worksheets.
2. We have recalculated the drawdown times for the 1" of runoff; the amount of rainfall the
bioretention areas are designed to treat. The ponding times were calculated using the RECARGA
computer software v2.3 developed by the University of Wisconsin. The summary of the results
from this analysis are attached to the bioretention worksheets.
3. We have modified our calculations to us the Simple Method of calculated the water quality
volume. The results of the calculations are included. The sizes of the bioretention areas have been
increased accordingly.
Due to the increase of required size of Bioretention area #12 and the constraints of Lot #156,
Bioretention Area # 12 has been replaced with Grassed Swale # 1. The changes have been made on
sheets 5-9a. Included with this submittal are the necessary grassed Swale worksheet, calculations
and notarized operations and maintenance manual. Please refer to sheet 9a for construction details
of Grassed Swale # 1. The length of the Swale was based on the requirement to reduce the nitrogen
30%.
4. Per the conversation with Annette Lucas on Thursday July 26, 2007, we have modified our plans
to show grass bioretention areas in all locations. The details have been modified to specify a 2.0'
depth of planting media and centipede sod has also been specified on the plans.
If you have any questions regarding the above information please call us at 877-9992
Sincerely
Andrew Klinksiek
Associate Engineer
Aiken & Yelle Associates, PA

DWQ Project No. r/~ ~ ~ ~ "Q~~ ~ `~
I. PROJECT INFORMATION
Project Name : _-~
Contact Person: ~
Swale ID:
Grass Swale Length
Tributary Drainage Area
Impervious Area
Max. Velocity from 2 Yr. Storm
Max. Velocity from 10 Yr. Storm
Min. side slopes
Steepest Effective Slope
Cover Crop
II. REQUIRED ITEMS CHECKLIST
~ U5 ft.
T ~ 12 ac.
®~ 31 ac.
~ , ~ ~ fps
~- U 2 fps
3 ratio
0 - ~, 1 ft/ft
C2v-fi Dew
Phone Number:
(at least 100 ft. per tributary acre)
(on-site and off-site drainage to the swale)
(on-site and off-site drainage to the swale)
(2 fps max.)
(3:1 min.)
(check dams may be used)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Ft f+ Vegetation Plan provided on plans
~-V The underlying soils are permeable and non-compacted
~t ~ Swale carries only stormwater flow
H y Water table depth is greater than 1 foot.
I~ t~ y Plan details for the swale provided.
I-1 #~-`/ Plan details for the inlets and outlets are provided.
f~-~ Check dams provided.
"~ -?^I The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing.
N f~~ The operation and maintenance agreement signed and notarized by the responsible party is provided.
DIVISION OF WATER QUALITY -GRASSED SWALE WORKSHEET
complete the following information):

GSl
Date: 07-30-2007
Project: CEDAR RIDGE
Description: GRASSED SWALE #1
FES#38A - 2YR VELOCITY
"~~~ Open Channel Flow - Trapezoidal Cross Section '~••
Side slope (H/lv)= 3
-------------------------------------------------------------------
Discharge Ave. Depth Area Top Froude Slope n Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s) (ft) ft) (ft)
-------------------------------------------------------------------
2.53 1.88 0.28 1.35 5.67 0.68 .01000 .0300 4.00
-------------------------------------------------------------------
Description: GRASSED SWALE #1
FES#38A -
*~ Open Channel
Side slope (H/1v)= 3
-----------------------
Discharge Ave. Depth
(cfs) vel. (ft)
(ft/s)
-----------------------
3.17 2.02 0.32
-----------------------
lOYR VELOCITY
Flow - Trapezoidal Cro
----------------------
Area Top Froude
(sq ft) width No.
Cft)
----------------------
1.57 5.90 0.69
----------------------
ss Section '~ ••
---------------------
Slope n Bottom
(ft/ value width
ft) (ft)
---------------------
.01000 .0300 4.00
---------------------
Page 1

Permit No. ~XP ~ ~ " UIJ~ ~ Y 2
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
T/zi.s form may be photocopied for use as an original.
DWO Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name
Contact Person:
(nwr t".,,1 (.~
L
Phone Number: (t11c1 1 ~ 7
For projects with multiple basins, specify which basin this worksheet applies to: ~
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation, Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
..,;
'+,
Soils Report Summary
In-Situ Soi] Type ~ ~
In-Situ Soi] Infiltration Rate ~Co a 3 in./hr. (the,nost restrictive soil layer)
SHWT Elevation ~ l7 ~" ft. (Seasonal High Water Table elevation)
Planting Soi] Texture (OCn-'Y~ Cn~IC~ (must be a sandy loam, loamy sand, or loam texture)
Planting Soil Infiltration Rate 2. d in./hr.
Basin Design Parameters
P" 5
Drainage Area X10® sq.ft. (on-site and off-site drainage to the basin)
Impervious Area ) , S~"U sq.ft. (on-site and off-site drainage to the basin)
Design Storm ~ inch (1.5 inch event for SA waters, 1 inch event for others)
Design Volume ~~~ c.f. (storage volume required)
Inlet Velocity 'u ~ X13 fps
Drawdown Time b ~ ~ hours
Basin Elevations
Temporary Pool Elevation 3`l'~ • ~~ fmsl (elevation of the bypass/oculet structure)
Planting Elevation ~`E~• 0 y fmsl (elevation of the ground surface bottom)
Bottom Elevation 34S-t~li fmsl (elevation of the bottom of the planting media)
Basin Dimensions
Basin Size G ~ ft. x ~~ ft. _ ~ 70i? sq. ft. (surfitce area at basin bottom)
Basin Volume Provided ~(~ c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings ,~ /
Number of plantings required J ~' ~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided =Trees _ + Shrubs N ~ ~ (at least 1 tree for every 3 slzrtirbs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
~"~ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
_ ~}~ b. No vertica] sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~Nc~r rZ~~u~rzt0 Pi~R NCQ~N~2g-mp ~YIANV~L E~FI~Z~IVt aU~y 2; 2C>G~
~i~'~ _ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
'~ g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~`~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
M~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~_ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~_ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, constriction schedule, etc..
SWU-108 4.07
Page 2 of 4

~~' m. Type of mulch layer and depth is specified on the plans.
~~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
H~'~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
~~~'L q. A benchmark is provided to determine the sediment accumulation in the basin area.
~_ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
~f ~'~' YY ``~~ length is 50 feet for SA waters, 30 feet for other waters).
~_ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
H ~~ t. Plans ensure that the installed system will meet design specifications (constricted or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H . ] 000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~~ber+ {~olc~nco
Title: ~02S~G~e/If
Address: 809 }~Ibric,ht 17~~~e -2c~~~i~h NC, 2~(a12
Phone:
Signatu
Date:
Note: The egally 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. h
I, ~~~ .. P ~ ~.~C-~2-- , a Notary Public for the State of ~,~ c~~~~. l.~ a~(` a~~t {1.G~.
County of ~ Jl ~~p~ , do hereby certify that _ O (r'T ~ (~~ O~.t\ C ~
personally appeared before me this ~~day of ~~~ ~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
Commission Expires 4-18-2012.
SEAL
P
My commission expires ~ ~ bbl
SWU-108 4,07
Page 4 of 4

Bioretention Area 1
RECARGA 2.X
Date: 27-7u1-2007 13:54:56
Output File: Bioretention Area l.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 21
Pervious CN= 74
Facility Area (sf)= 1700
Trib. Area (AC)= 1.9
RATIOimp2rg= 10.2238
RATloperv2rg= 38.4609
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root Zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suction head (in)= -39
Max. underdrain flow (in/hr)= 0.008
underdrain diam (in)= 4.003
WATER BALANCE TERMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.16 1.00 100.00
Runoff 0.02 0.13 12.84
Recharge 0.07 0.46 45.61
Evaporation 0.00 0.00 0.47
underdrain 0.08 0.47 46.31
Storage -0.01 -0.05 -5.23
Infiltrated 0.14
Precip. 2.50
Imp. Inflow 0.05 2.36 30.64
Perv.Inflow 0.05 0.61 29.68
Basin Stayon(in) -34.94
Total Stayon(in) 1.91
Mass Balance checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 1.414732e-001
vinf difference (%)_ -0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 7.403220e-002
vrech difference (%)= 0.0
dvsoil=inf-rech-et
dvsoil= 6.667160e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= 9.216742e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 8.3
max time ponded (h)= 8.3
total time RZ saturated (h)= 10.5
total time Rz at wilting point (h)= 0.0
total time Tz saturated (h)= 11.0
max time Rz saturated (h)= 10.3
max time RZ at wilting ppoint (h)= 0.0
max time Tz saturated (h)= 10.0
near saturated times for simulation= 2
21.5 10.3
22.3 0.3
wilting point times for simulation= 0
0.0 0.0
ponded times for simulation= 1
19.8 8.3
overflow times for simulation= 0
Page 1

BI01
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 1
PE 73A 8~~ DWHCP - Entrance Velocity
~'~ Open Channel Flow - Trapezoidal Cross Section i~'t
Side slope (H/1v)= 3
-------------------------------------------------------------------
Discharge Ave. Depth Area Top Froude slope n Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
<ft/s) (ft) ft) (ft)
-------------------------------------------------------------------
0.32 0.43 0.16 0.73 4.98 0.20 .00100 .0300 4.00
-------------------------------------------------------------------
Page 1

Permit No. ~XP C~~?' UO~ l Y 2
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
DWQ Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : ~ec~c;t~ 1~~(t=(-
Contact Person: ~'ic.,r~l d ~l~Ilc
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to: ~ ~-
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fms]).
Soils Report Summary
In-Situ Soil Type ~ ~
In-Situ Soil Infiltration Rate ~ (o ~ ~ in./hr. (the most restrictive soil layer)
SHWT Elevation ~ l~ ~~' ft. (Seasonal High Water Table elevation)
Planting Soil Texture f oC~rnV S~nC1 (must be a sandy loam, loamy sand, or loam texture)
Planting Soil Infiltration Rate 2 • ~ in./hr.
Basin Design Parameters
Drainage Area y() 4 sq.ft. (on-site and off-site drainage to the basin)
Impervious Area 0(?a sq.ft. (on-site and off-site drainage to the basin)
Design Storm 1 inch (1.5 inch event for SA waters, 1 inch event for others)
Design Volume 2g2t~ c.f. (storage volccrne required)
Inlet Velocity ~ I fps
Drawdown Time ~.3 hours
Basin Elevations
Temporary Pool Elevation ~ ~~ L' fmsl (elevation of the bypass/outlet structure)
Planting Elevation ~C? fmsl (elevation of the ground sarrface bottom)
Bottom Elevation ~4 • C7 fmsl (elevation of the bottom of the planting media)
Basin Dimensions
Basin Size 50 ft. x ~ ~ ft. _ ~~OU sq. ft. (surface area at basin bottom)
Basin Volume Provided ZS~` c.f.
SWU-]08 4.07
Page 1 of 4

Basin Plantings ~
Number of plantings required d v ~ stems (400 stems per acre of bioretention area is required at a mirii,nu,n)
Total No. of plantings provided =Trees ~~ + Shrubs N ~ ~ (at least 1 rree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manua] and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
~~ b. No vertical sand bed is proposed.
~ -~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~Ne°c R~r~u4rr~Q PER Nca~rv;zemP YnANV~1L 1:1=i^~L~1Vt July 2, 2~~~7
~~~~____ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
F~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~_ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
_ ~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

~~~ m. Type of mulch layer and depth is specified on the plans.
~~' n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
~~~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ ~I p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
"` ~_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
~'` r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
~~~ length is 50 feet for SA waters, 30 feet for other waters).
""~._ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~_ t.- Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity; accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat al] diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c~b2r~ Pol~nco
Title: ~~es~tc~ent
Address; 8509 ~IbriGl~t 17m~~e 12,c~~(,rc~h (~]C, 2'j(o12.
Phone:
Signatu
Date:
Note: The egally 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, ~~ [, . P \ Q~`Ca2.,__ , a Notary Public for the State of ~~~_~. l.,.d~t"a~~f1,U~,.
County of ~ ~, ~ o.~p ~ , do hereby certify that O ~~1~~~~ ~t~ ~
personally appeared before me this ~~,day of ~~~ 1 ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WnKE COUNTY, N.C.
My Csmmission Expires 4-18-2012.
SEAL
My commission expires ~ "~ ~ ~ ~b1
SwU-108 4.07
Page 4 of 4

BI02
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretnetion Area 2
FES#61C - Inlet Velocity
'~~ Open channel Flow - Trapezoidal cross section "~~
side slope (H/lv)= 3
-------------------------------------------------------------------
Discharge Ave. Depth Area Top Froude Slope n Bottom
(cfs) vel. (ft) (sq ft) width rvo. (ft/ value width
(ft/s) (ft) ft) (ft)
-------------------------------------------------------------------
7.39 1.14 0.86 6.48 10.14 0.25 .00100 .0300 5.00
-------------------------------------------------------------------
Page 1

Bioretention Area 2
RECARGA 2.X
Date: 27-)u1-2007 14:43:17
Output File: Bioretention Area 2.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 38
Pervious CN= 74
Facility Area (sf)= 3000
Trib. Area (AC)= 2.07
RATloimp2rg= 11.4214
RATIOperv2rg= 18.635
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root Zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suction head (in)= -39
Max. underdrain flow (in/hr)= 0.015
underdrain diam (in)= 5.317
WATER BALANCE TERMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.18 1.00 100.00
Runoff 0.00 0.00 0.00
Recharge 0.11 0.59 59.38
Evaporation 0.00 0.01 0.76
underdrain 0.09 0.48 48.32
Storage -0.02 -0.08 -8.46
Infiltrated 0.18
Precip. 2.07
Imp. Inflow 0.05 1.93 25.44
Perv.Inflow 0.01 0.38 8.21
Basin Stayon(in) -57.12
Total Stayon(in) 1.58
Mass Balance Checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 1.783422e-001
vinf difference (%)_ -0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 1.058995e-001
vrech difference (%)= 0.0
dvsoil=inf-rech-et
dvsoil= 7.108488e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= 9.216742e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 5.3
max time ponded (h)= 5.3
total time Rz saturated (h)= 5.8
total time Rz at wilting ppoint (h)= 0.0
total time Tz saturated (h)= 6.0
max time Rz saturated (h)= 5.8
max time Rz at wilting point (h)= 0.0
max time Tz saturated (h)= 6.0
near saturated times for simulation= 1
17.3 5.8
wilting point times for simulation= 0
0.0 0.0
ponded times for simulation= 1
17.0 5.3
overflow times for simulation= 0
0.0 0.0
Page 1

Permit No. ~XP (,~~' ~(?~ ` ~( 2
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
DWQ Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : ~ eCf ~~' P`~ Ck
Contact Person: Hc,r~~ C.l `~~tIC
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soi] Type ~~~'
In-Situ Soil Infiltration Rate ~Co;`.3 in./hr. (the most restrictive soil layer)
SHWT Elevation ~ C9 .~ ft. (Seasonal High Water Table elevation)
Planting Soil Texture 1 oG~mV
~ 5 ~~~~~ (must be a sandy loam, loamy sand, or loam texture)
Planting Soi] Infiltration Rate 2. b in./hr.

Basin Design Parameters
Drainage Area 7C)~ sq.ft. (on-site and off-site drainage to the basin)
Impervious Area ' Z O C sq.ft. (on-site and off-site drainage to the basin) "
Design Storm 1 Inch (1.5 inch event for SA waters, 1 inch event for others)
Design Volume G1~U c.f. (storage volume re~atired)
Inlet Velocity (7, ~ fps
Drawdown Time &, 5 hours
i C
Basin Elevations
Temporary Pool Elevation °t • ~ S fmsl (elevation of the bypass/outlet stricture)
Planting Elevation 33 ~. ~ S fmsl (elevation of the grocmd surface bottom.) ""~ '` ~ '"'""
Bot[om Elevation 33 (c• 75 fmsl (elevation of the bottom of the planting media)

Basin Dimensions
Basin Size ~ ft. x ~ ft. _ _~ Jed sq. ft. (surface area at basin bottom)
Basin Volume Provided ~~Qt3 c.f.
SWU-]08 4.07
Page 1 of 4

Basin Plantings
Number of plantings required stems (400 stems per acre of bioretention. area is required at a rninimun2)
Total No. of plantings provided ~_ =Trees t~~ + Shrubs N ~ t~ (at least 1 tree for every 3 slxrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
"-~-~- a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
_ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~Ivc~r Rlrl.~Utrt6O ~~R NCQtni'~2B+~1P Y11ANViaZ EFFrCT1V~ aUL~( 2; 2007
-~ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
'~ g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ f~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
1~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~'~ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

HP~ m. Type of mulch layer and depth is specified on the plans.
~~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
~~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
"`~_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~l s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~_ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Pnme trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shnibs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. Al] components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c,ber~ Pol~nco
Title: ~OeS~~c~ent
Address: 809 }~Ibric,ht 1~m`~e I~a~~t~t~ N~ 21012
Phone:
Signatu
Date: __~Q~_
Note: The egally 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, 'i~ ~, . ~ \ ~.~C~- , a Notary Public for the State of ~,~ tx~~, l., at` Blot f1CJ~.
County of ~ ~l ~~~,~,~ ~ , do hereby certify that O t"~'" \ [~~„ O~,t\ C`_ t^~
personally appeared before me this ~_day of ~~~ ~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My Cwmmisslon Expires 4-18-2012.
SEAL
My commission expires ~ ' ~ ~~ :ZC~I .~,
SWU-108 4.07
Page 4 of 4

BI03
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 3
FES#64A - Inlet Velocity
~'~ Open Channel Flow - Trapezoidal Cross Section '~'~
side slope (H/lv)= 3
Discharge Ave. Depth Area Top Froude Slope n Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s)
-
-
------
----
-
------ (ft)
--------------- ft)
------------- (ft)
-------
---
-
--
-----
--
2.08 0.81 0.48 2.58
-------------------------------- 6.86 0.23
--------------- .00100 .0300
------------- 4.00
-------
Page 1

r
Bioretention Area 3
RECARGA 2.X
Date: 27-7u1-2007 14:54:17
Output File: Bioretention Area 3.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 17
Pervious CN= 74
Facility Area (sf)= 950
Trib. Area (AC)= 1.21
RATloimp2rg= 9.43189
RATIOperv2rg= 46.0498
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root Zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suc tion head (in)= -39
Max. underdrain flow (in/hr)= 0.005
underdrain diam (in)= 2.992
WATER BALANCE TE RMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.10 1.00 100.00
Runoff 0.02 0.18 18.14
Recharge 0.04 0.42 41.49
Evaporation 0.00 0.00 0.42
underdrain 0.05 0.45 44.55
storage -0.00 -0.05 -4.61
Infiltrated 0.08
Precip. 2.61
Imp. Inflow 0.05 2.47 46.63
Perv.Inflow 0.06 0.67 61.74
Basin Stayon(in) -28.67
Total stayon(in) 1.98
Mass Balance Checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 8.423071e-002
vinf difference (%)_ -0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 4.269741e-002
vrech difference (%)= 0.0
dvsoil=inf-rech-et
dvsoil= 4.110333e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= 8.064649e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 8.5
max time ponded (h)= 8.5
total time Rz saturated (h)= 12.8
total time Rz at wilting ppoint (h)= 0.0
total time Tz saturated (h)= 12.3
max time Rz saturated (h)= 12.8
max time Rz at wilting point (h)= 0.0
max time Tz saturated (p)= 11.5
near saturated times for simulation= 1
24.3 12.8
wilting point times for simulation= 0
0.0 0.0
ponded times for simulation= 1
20.3 8.5
overflow times for simulation= 0
Page 1

Permit No. ~XP ~~~ " (~()~ ~ v 2..
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
DWO Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : C~ ecC~~ ~tii C~-cic?
Contact Person: t~l~~p~ G( ~~tl~,'
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to: ~'
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type
In-Situ Soil Infiltration Rate ?(o=~ in./hr. (the most restrictive soil layer)
SHWT Elevation S l7 ~~' ft. (Seasonal High Water Table elevation)
Planting Soil Texture (O~YY~ G.n~l (mccst be a sandy loanx, loamy sand, or loam texture)
Planting Soi] Infiltration Rate % 2. ® in./hr.
Basin Design Parameters
Drainage Area 7 ~, 1 ~O sq.ft. (on-site and off-site drainage to the basin)
Impervious Area ~~ t 1C}y sq.ft. (on-site and off-site drainage to the basin) ~ ~ -
Design Storm 1 inch (1.5 inch event for SA waters, 1 inch event for otlzers)~
Design Volume o2~S$ c.f. (storage volume required) ~,
Inlet Velocity I ~ ~?~'] fps _ ~ ~ ~ :, ~ ~; ;,,~~ ;
Drawdown Time ~~ 5 hours ` ' \
Basin Elevations .., ~ _
Temporary Pool Elevation ~~ fmsl (elevation of the bypass/outlet structure)
Planting Elevation fmsl (elevation of the ground surface bottom)
Bottom Elevation ~~~ fmsl (elevation of the bottom of the planting media)
Basin Dimensions
Basin Size `Z ~ ft. x I ~' ~ ft, _ ~ 3(1u
sq. ft. (surface area ut basin bottom)
Basin Volume Provided '7 f~4 c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings ~
Number of plantings required J v ~ stems (400 sterns per acre of bioretention area is required at a minimum)
Total No. of plantings provided =Trees ~_ + Shrubs N~ 1~ (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
_~_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
--~ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~Ne~ Rlrr~v~rc60 PtR NCQ~n1~2g+~nP Y11RNVi~~ ~~1~~~T1Vtr J~t.y 2; 2CO7
d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~ ~~ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
'~ g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~`~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~ _ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours, Draw down calculations are attached.
~_ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, constriction schedule, etc..
SWU-108 4.07
Page 2 of 4

~'~~ m. Type of mulch layer and depth is specified on the plans.
~~'~' n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
~~ o: Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~r' ' p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
"`_L_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
~_ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
~},, ~ length is 50 feet for SA waters, 30 feet for other waters).
~' ° `I s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~_ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat al] diseased trees and shnibs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4,07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order,
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c~berk ~p~t~/1Co
Title: ~c'es~tc~ent
Address; g~09 ~Ib~q~~' 17~`ve ~.~~~r~h (~L 2"l~012
Phone:
Signatu
Date:
Note: The egally responsible party should not be a homeowners association unless more than SO% of the lots have been sold and a
resident of the subdivision has been named the president.
I, ~~ ~, . ~ \ ~CrC~2~- , a Notary Public for the State of ~~ b~~~ ~ Q~ ®~~~ ~CJ~,.
County of ~ A ~~,~~ , do hereby certify that b (' ~ ~ ~~~ a,n C`_ n
personally appeared before me this ~~day of ~f7Q
and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My C~mmisslon Expires 4-18-2012.
SEAL
My commission expires ~ ' ~ ~b1 ~,
SWU-108 4.07
Page 4 of 4

BI04
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 4
FES#57A - Inlet velocity
~~ open Channel Flow - Trapezoidal Cross Section '~'~
Side slope (H/lv)= 3
Discharge Ave. Depth Area Top Froude slope n Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s)
--------------------------------- (ft)
--
- ft) (ft)

5.40 1.07 0.79 5.06
--------------------------------- -----
------
8.76 0.25
-------------- -------------
.00100 .0300
------------- -------
4.00
-------
Page 1

Bioretention Area 4
RECARGA 2.X
Date: 27-7u1-2007 14:59:49
Output File: Bioretention Area 4.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 36
Pervious CN= 74
Facility Area (sf)= 2300
Trib. Area (AC)= 1.66
RATloimp2rg= 11.318
RATIOperv2rg= 20.1209
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suction head (in)= -39
Max. underdrain flow (in/hr)= 0.011
underdrain diam (in)= 4.656
WATER BALANCE TERMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.14 1.01 100.00
Runoff 0.00 0.00 0.00
Recharge 0.08 0.59 58.46
Evaporation 0.00 0.01 0.73
underdrain 0.07 0.49 48.87
storage -0.01 -0.08 -8.05
Infiltrated 0.14
Precip. 2.12
Imp. Inflow 0.05 1.98 32.19
Perv.Inflow 0.02 0.41 11.76
Basin Stayon(in) -54.98
Total Stayon(in) 1.63
Mass Balance Checks:
vinsoil=input-toff-dvh
vinsoil (ac-ft)= 1.435026e-001
vinf difference (%)= 0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 8.389297e-002
vrech difference (%)_ -0.0
dvsoil=inf-tech-et
dvsoil= 5.856870e-002
dvsfce (ac-ft)= O.000OOOe+000
dvsZ=input-toff-inf
dvs2 (ac-ft)= O.000OOOe+000
PLANT SURVIVABILITY TERMS
total time ponded (h)= 5.5
max time ponded (h)= 5.5
total time Rz saturated (h)= 6.3
total time Rz at wilting point (h)= 0.0
total time Tz saturated (h)= 6.5
max time Rz saturated (h)= 6.3
max time Rz at wilting point (h)= 0.0
max time Tz saturated (h)= 6.5
near saturated times for simulation= 1
17.8 6.3
wilting point times for simulation= 0
0.0 0.0
ponded times for simulation= 1
17.3 5.5
overflow times for simulation= 0
Page 1

Permit No. ~XP C3~~ - U~~ ~ 1r ~•
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
DWQ Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : ~Q(~Gt~l' '~ i C;(-
Contact Person: ~-kc~~ol ~( Veti~
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type
In-Situ Soil Infiltration Rate
SHWT Elevation
Planting Soil Texture
Planting Soil Infiltration Rate
~ '~
? ~ ~ ~ in./hr. (the most restrictive soil layer)
~ 1~ '~' ft. (Seasonal High Water Table elevation)
~Ctirn ~^~~~ (must be a sandy loam, loamy sand, or loam texture)
i "~ • ~ in./hr.
Basin Design Parameters
Drainage Area ~0~ sq.ft. (on-site and off-site drainage to the basin)
Impervious Area 1 t Q~0 sq.ft. (on-site and off-site drainage to the basin)
Design Storm I inch (1.5 inch event for SA waters, 1 inch event for others) :~,
Design Volume ~~_ c.f. (storage volume required)
Inlet Velocity t ~ Ol fps
Drawdown Time ~]. 2~ hours
t.!
Basin Elevations
Temporary Pool Elevation S4.'1 J` fmsl (elevation of the bypass/outlet structure) , .. "' ~:-i'i
Planting Elevation 3~3.~15 fmsl (elevation of the ground surface bottom)
Bottom Elevation 5~l 47 j fmsl (elevation of the bottom of the plmitirag merlin)
Basin Dimensions
Basin Size ~~ ft. x t OU ft. _ ?~.~~ ~~ sq. ft. (surface area at basin bottom)
Basin Volume Provided 3~~ c.f.
SWU-]08 4.07
Page 1 of 4

Basin Plantings ,~
Number of plantings required d v ~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided N) A- =Trees A~.~ + Shrubs N ~ ~F (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
~_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
_ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~tscr ~~~~,~~~© PrR tvca~r~~2~~nP mr~rv~aZ E~Frrc~rld~ Jv!_y 2; 207
~i~~ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~" f. Ponding depth of 6-12" is provided.
g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~_ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

-- m. Type of mulch layer and depth is specified on the plans.
N'~. I~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
N~~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
~~'' r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~_ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
H ~~ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Pnme trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. Al] components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. Tf the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c,ber~ Pol~nco
Title: ~t'PS•iG~e/lf
Address: g g 09 ~ I b ri q ht' 17~ ~e 12. t~~ Gr q h N L 21(012
Phone:
Signatu
Date: ~_
Note: The egally 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, ~~1.d.7~, . ~ ~ 2.~C~2,.- , a Notary Public for the State of ~,~ [x~. l~ ae-O~~~c1C~,.
County of ~_ Jl ~,~p , do hereby certify that b~ Q ~~1T \ [j~, O~,f1 C t'~
personally appeared before me this ~~day of ~o~ 1 ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My Cammisslon Expires 4-18-2012.
SEAL
r ~
My commission expires ~ l .~b1 :~
SWU-108 4.07
Page 4 of 4

BIOS
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 5
FES#51A - Inlet Velocity
~~'~ open Channel Flow - Trapezoidal Cross Section '~~
Side slope (H/1V)= 3
-----------------------
Discharge Ave. Depth ------------------------
Area Top Froude -------------
Slope n -------
Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s)
-- (ft)
------------
---------- ft)
------------- (ft)
-------
---------------------
4.48 1.01 0.72
----------------------- --
4.43 8.32 0.24
------------------------ .00100 .0300
------------- 4.00
-------
Page 1

Bioretention Area 5
RECARGA 2.X
Date: 27-~u1-2007 15:05:30
Output File: Bioretention Area 5.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 26
Pervious CN= 74
Facility Area (sf)= 2000
Trib. Area (AC)= 1.9
RATloimp2rg= 10.7593
RATloperv2rg= 30.6227
LAYER DEPTH (in) Ksat (in/h r) TEXTURE
Depression 12 --- ---
Root zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suc tion head <in)= -39
Max. underdrain flow (in/hr)= 0.010
underdrain diam (in)= 4.341
WATER BALANCE TE RMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.16 1.01 100.00
Runoff 0.01 0.05 5.28
Recharge 0.08 0.50 50.04
Evaporation 0.00 0.01 0.55
underdrain 0.08 0.51 50.26
storage -0.01 -0.06 -6.13
Infiltrated 0.15
Precip. 2.37
Imp. Inflow 0.05 2.23 30.29
Perv.Inflow 0.03 0.54 20.72
Basin Stayon(in) -42.25
Total Stayon(in) 1.81
Mass Balance Checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 1.546803e-001
vinf difference (%)= 0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 8.171515e-002
vrech difference (%)= 0.0
dvsoil=inf-rech-et
dvsoil= 7.205999e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= O.000OOOe+000
PLANT SURVIVABILITY TERMS
total time ponded (h)= 7.3
max time ponded (h)= 7.3
total time Rz saturated (h)= 7
total time Rz at wilting point (h)=
total time Tz saturated (h)= 8
max time Rz saturated (h)= 7
max time Rz at wilting point (h)=
max time Tz saturated <p)= 8
near saturated times for simulation=
19.0 7.8
wilting point times for simulation=
0.0 0.0
ponded times for simulation=
19.0 7.3
overflow times for simulation=
8
0.0
5
8
0.0
0
1
0
1
0
Page 1

Permit No. ~" X P ~% ~~ " L C~'~^ ~
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form maybe photocopied for use as an original.
DWO Stormwater Mana~;ement Plan Review:
A complete Stormwater management plan submittal includes a stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name
Contact Person:
C:id' ~11 C~ Cl ~
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fms]).
Soils Report Summary
In-Situ Soil Type ~~
In-Situ Soil Infiltration Rate ? (o ~ 3 in./hr. (the most restrictive soil layer)
SHWT Elevation ~ !~ '~ ft. (Seasonal High Water Table elevation)
Planting Soil Texture ~ t)C~t'Y1 G.(1~~ (must be a sandy loam, loamy sand, or loam texture)
Planting Soi] Infiltration Rate 2. ~ in./hr.
Basin Design Parameters
Drainage Area ~ ~tO~ sq.ft. (on-site and off-site drainage to the basin)
Impervious Area ~P ~(~ sq.ft. (on-site and off-site drainage to the basin)
Design Storm ~ inch (1.5 inch event for SA waters, 1 inch event for others)
Design Volume _ ~.'S~ c.f. (storage volume required)
Inlet Velocity U. ~~ fps b~"`~ '~` ~~
Drawdown Time a ~ $ hours
i;;;,~
Basin Elevations
Temporary Pool Elevation ~i7~. ~ fmsl (elevation of the bypass/outlet structure)
Planting Elevation ~a? 3. f3 fmsl (elevation of the ground surface bottom) ,~ ; : , , ~ , „ ;i,:;
Bottom Elevation ~1 f < ~ fmsl (elevation of the bottorn of the planting media)
Basin Dimensions
Basin Size ~ ~ ft. x ~ ft. _ ~ ~u sq. ft. (surface area at basin bottom)
Basin Volume Provided I (75~ c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings ~ /
Number of plantings required J v stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided = Trees + Shrubs N ~ V~ (at least 1 tree for every 3 sh,-c~.bs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package wil] result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
~_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
__ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~N~r Rtr~v~r~E© ~tR Nco~r~~2~+mP Y-1ANVA~ E1=F~tT-VE av~.y Z; 2co7
_ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~ ~'~ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~' k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, constriction schedule, etc..
SWU-108 4.07
Page 2 of 4

~_ m. Type of mulch layer and depth is specified on the plans.
~~1 n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
N~'y o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
~~` _ q. A benchmark is provided to determine the sediment accumulation in the basin area.
+~ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~~~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
-~ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat al] diseased trees and shnibs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-]08 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: _~~,ber+ l~ol~nco
Title: ~~eS~~c~ent
Address: g ~ 09 ~ I b ri G ~~ ~n~ ~ e 12, c,.~ L~ q h N L 2~ (012
Phone:
Signatu
Date:
Note: The egally 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, '1~~17J` ~.. P \ Q.~C~- , a Notary Public for the State of ~,~ c~~~n.. l.,a~c-®~~tRCJ~.
County of ~ Jl ~~,~,(~ ~ , do hereby certify that _ O C~"T \" (~1 0.t1 C C'7
personally appeared before me this ~_day of ~~~ 1 ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My C®mmisslon Expires 4-18-2012.
SEAL
My commission expires ~ ~ ~ 'dam ~b~ r.Z,
SwU-108 4.07
Page 4 of 4

BI06
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 6
PE#40A - Inlet Velocity
•~'° Open Channel Flow - Trapezoidal Cross Section ~~'
side slope (H/lv)= 3
-------------------------------------------------------------------
Discharge Ave. Depth Area Top Froude Slope n Bottom
(cfs) vel. (ft) (sq ft) width tvo. <ft/ value width
(ft/s) (ft) ft) (ft)
-------------------------------------------------------------------
0.25 0.47 0.20 0.53 3.22 0.20 .00100 .0300 2.00
Page 1

Bioretention Area 6
RECARGA 2.X
Date: 27-7u1-2007 15:11:21
Output File: Bioretention Area 6.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 34
Pervious CN= 74
Facility Area (sf)= 850
Trib. Area (AC)= 0.64
RATIOimp2rg= 11.1514
RATIOperv2rg= 21.6468
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root Zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suc tion head (in)= -39
Max. Underdrain flow (in/hr)= 0.008
Underdrain diam (in)= 4.003
WATER BALANCE TE RMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.06 1.01 100.00
Runoff 0.00 0.00 0.00
Recharge 0.03 0.58 57.76
Evaporation 0.00 0.01 0.69
Underdrain 0.03 0.50 49.25
Storage -0.00 -0.08 -7.71
Infiltrated 0.06
Precip. 2.17
Imp. Inflow 0.05 2.03 84.28
Perv.inflow 0.02 0.43 34.80
Basin Stayon(in) -52.66
Total Stayon(in) 1.67
Mass Balance Checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 5.537047e-002
vinf difference (%)_ -0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 3.198352e-002
vrech difference (%)= 0.0
dvsoil=inf-rech-et
dvsoil= 2.300225e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= 2.304185e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 5.8
max time ponded (h)= 5.8
total time Rz saturated (h)= 6.5
total time Rz at wilting point (h)=
total time Tz saturated (h)= 7.3
max time Rz saturated (h)= 6.5
max time Rz at wilting ppoint (h)=
max time Tz saturated (h)= 7.3
near saturated times for simulation=
18.0 6.5
wilting point times for simulation=
0.0 0.0
ponded times for simulation= 1
17.5 5.8
overflow times for simulation= 0
0.0
0.0
1
0
Page 1

Permit No. ~XP ~• ~' U~~ ~ ~~.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
DWO Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : [~ eC,l~~' ~ ~
Contact Person: ~Y~t`c~ G~ ~2L1~
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fms]).
Soils Report Summary

In-Situ Soil Type ~ _~
~'
In-Situ Soil Infiltration Rate ~ (o ~ `3 in./hr. (the most restrictive soil layer)
SHWT Elevation ~ l~ .~ ft. (Seasonal High Water Table elevation)
Planting Soil Texture ~ OGm C~(l~~ (must be a sandy loam, loamy sand, or barn texture)
Planting Soil Infiltration Rate 2 . © in./hr.
Basin Design Parameters
Drainage Area 33, ~U~ sq.ft. (on-site and off-site drainage to the basin)
Impervious Area ~.~~IpLV sq.ft. (on-site and off-site drainage to the basin)
Design Storm 1 inch (1.5 inch event for SA waters, 1 inch event for otliersJ - -- -; ,•
Design Volume 1,$~~~ c.f. (storage volume required)
Inlet Velocity ~ fps
Drawdown Time ~ 8 hours r~ r
Basin Elevations
Temporary Pool Elevation 3? 2-Gt7 fmsl (elevation of the bypass/outlet structure) .k: ; ,';~.k.~
Planting Elevation ~~7~~p0 fmsl (elevation of the ground surface bottom)
Bottom Elevation `~bct~00 fmsl (elevation of the bottom of the plmiting media)
Basin Dimensions
Basin Size ~~ ft. x ~P4 ft. _ ~ U~ sq. ft. (surface area at basin bottom)
Basin Volume Provided l pd c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings ~
Number of plantings required J v ~ stems (400 stems per acre of bioretention urea is required at a minimum)
Total No. of plantings provided =Trees N ~(~- + Shrubs N ~ {~ (at least 1 tree for every 3 shrubs)
This system (check one) does , does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
_ b. No vertical sand bed is proposed.
~ -~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~Nec R~~v+r~~o PrrR tvc.a~rvaemP ml~ntVaL ~~~~~Slv~ Jui'_y 2; ZC~~7
~~_ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
~_ g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~`~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~_ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

~~' m. Type of mulch layer and depth is specified on the plans.
~~" n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
~~~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
"" L_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
~_ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
' ""~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
_~_ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat al] diseased trees and shn~bs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8, Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H . ] 000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c~ber~- ~O~c~nCo
Title: }~c'es~,clent
Address: 8509 ~~briGtlt' 17n~~e 12.a~f~c~h (~(.~ 2](012
Phone:
Signatu
Date:
Note: The egally 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, ~ , . P 1 ~«..- , a Notary Public for the State of ~,~ [~~~~c~. l..,at.t'a~ti1CJ~.
County of ~ A ~ ~.~~ ~ , do hereby certify that b ~~~~~ 0.f1 C' t'~
personally appeared before me this ~_day of ~~,~ ~~~ ~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance regt.itrements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
Commission Expires 4-18-2x)12.
SEAL
My commission expires ~ r ~ ~ .Zb~
SwU-108 4,07
Page 4 of 4

BI07
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 7
PE#33A - Inlet velocity
*~~ open Channel Flow - Trapezoidal Cross section *••
side slope (H/lv)= 3
-------------------------------------------------------------------
Discharge Ave. Depth Area Top Froude Slope n Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s) (ft) ft) (ft)
-------------------------------------------------------------------
0.46 0.56 0.29 0.82 3.72 0.21 .00100 .0300 2.00
Page 1

Bioretention Area 7
RECARGA 2.X
Date: 27-7u1-2007 15:16:06
Output File: Bioretention Area 7.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 68
Pervious CN= 74
Facility Area (sf)= 1850
Trib. Area (AC)= 0.76
RATloimp2rg= 12.1685
RATIOperv2rg= 5.72637
LAYER DEPTH (in)
Depression 12
Root zone 24
Storage 4
Native ---
Ksat (in/hr) TEXTURE
4.14 1
10.00 1
1.28 3
Init. Cond.: suction head (in)= -39
Max. underdrain flow (in/hr)= 0.008
underdrain diam (in)= 4.003
WATER BALANCE TERMS
volu me(ac-ft) Depth (in)
Inflow 0.07 1.00
Runoff 0.00 0.00
Recharge 0.05 0.71
Evaporation 0.00 0.01
underdrain 0.03 0.42
Storage -0.01 -0.14
Infiltrated 0.07
Precip. 1.51
Imp. Inflow 0.03 1.37
Perv.Inflow 0.00 0.15
Basin Stayon(in) -81.69
Total Stayon(in) 1.09
Mass Balance checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 6.700968e-002
vinf difference (%)= 0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 4.775393e-002
vrech difference (%)_ -0.0
dvsoil=inf-rech-et
dvsoil= 1.841844e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= O.000OOOe+000
PLANT SURVIVABILITY TERMS
total time ponded (h)= 2.8
max time ponded (h)= 2.8
total time Rz saturated (h)= 3.0
total time Rz at wilting ppoint (h)= 0.0
total time Tz saturated (h)= 3.0
max time Rz saturated (h)= 3.0
max time Rz at wilting point (h)= 0.0
max time Tz saturated (h)= 3.0
near saturated times for simulation= 1
14.8 3.0
wilting point times for simulation= 0
0.0 0.0
ponded times for simulation= 1
14.8 2.8
overflow times for simulation= 0
%of Inflow
100.00
0.00
71.26
1.25
41.54
-14.05
51.31
2.65
Page 1

Permit No. ~~P ~~' ~?(?~ ~ v ~.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an origir2al.
DWQ Stormwater Management Plan Review
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : C2c~c,~ ~ ~ Cji
Contact Person: ~-kc.rol rl Veli~
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type
In-Situ Soil Infiltration Rate
SHWT Elevation
Planting Soil Texture
Planting Soil Infiltration Rate
Basin Design Parameters
Drainage Area
Impervious Area
Design Storm
Design Volume
Inlet Velocity
Drawdown Time
Basin Elevations
Temporary Pool Elevation
Planting Elevation
Bottom Elevation
Basin Dimensions
Basin Size
Basin Volume Provided
? ~ ~ ~ in./hr. (the most restrictive soil layer)
~ l7 .E ft. (Seasonal High Water Table elevation)
~ ~~m ~~~~ (must be a sandy loam, loamy sand, or loam texture)
,Z ~ ~ in./hr.
~5! ~~~ sq.ft. (on-site and off-site drainage to the basin)
~~ r ~Q sq.ft. (on-site and off-site drainage to the basin)
Inch (1.5 inch event for SA waters, 1 inch event for others)
.t(a'SZo c.f. (storage volume required)
(+ I~ fps
~ ~ c7 hours
37'~~7~ fmsl (elevation of the bypass/outlet structure)
3 7:3.75 fmsl (elevation of the ground surface bottom)
37 ~ <7,S fms] (elevation of the bottom of the planting media)
~~ ft. x ~ ~ ft. _ ~1 ~~ sq. ft. (surface area at basin bottom)
u C3 c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings ~
Number of plantings required J v ~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided =Trees ~_ + Shrubs N ~ t~ (at least 1 rree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials.
+~ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
-~ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~Ne~r R~t~vorttfl PAR Nco~nl~emP mr~rv;rAL "E~F~~~r1Y~ JUr..y 2; 2c>o~7
d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
l~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~_ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
_~_ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, constniction schedule, etc..
SWU-108 4.07
Page 2 of 4

H~' m. Type of mulch layer and depth is specified on the plans.
~~' n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
~~~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
~i q. A benchmark is provided to determine the sediment accumulation in the basin area.
r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
M~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~_ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Pnme trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shn~bs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-]08 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline st.~bstances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c~b2r~ Pol~nco
Title: ~c'e5~tclent
Address: 8$09 l~lbriq~l' 17r-t`ye 12, a1(,i~h (~L 2.~(pl2
Phone:
Signatu
Date:
NO[e: The egally 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, 'i~.7` ~, . ~ \ 2.«- , a Notary Public for the State of ~~ t~e~. l.. at' G,~~t1CJ4.
County of ~ A ~~.~~ ~ , do hereby certify that O t"~1~" ~ ~Z~~ 0.~ C C'~
personally appeared before me this ~~day of ~i i~,,~ ~~~ 1 ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My G.mmisslon Expires 4-18-2012,
SEAL
My commission expires ~~ ~ ~~ iZbl °.~
SWU-108 4.07
Page 4 of 4

BI08
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 8
FES#24A - Inlet velocity
~~' open Channel Flow - Trapezoidal Cross Section '~'~
Side slope (H/lv)= 3
-----------------------
Discharge Ave. Depth ------------------------
Area Top Froude -------------
Slope n -------
Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s) (ft)
----------------------- ft)
------------- (ft)
-------
-----------------------
6.68 1.13 0.89
----------------------- -
5.90 9.32 0.25
------------------------ .00100 .0300
------------- 4.00
-------
Page 1

Bioretention Area 8
RECARGA 2.X
Date: 27-~u1-2007 15:20:22
Output File: Bioretention Area 8.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 41
Pervious CN= 74
Facility Area (sf)= 2700
Trib. Area (AC)= 1.74
RATIOimp2rg= 11.5095
RATloperv2rg= 16.5625
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suc tion head (in)= -39
Max. underdrain flow (in/hr)= 0.008
underdrain diam (in)= 4.003
WATER BALANCE TE RMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.15 1.00 100.00
Runoff 0.00 0.00 0.00
Recharge 0.09 0.62 61.54
Evaporation 0.00 0.01 0.81
underdrain 0.07 0.47 46.70
storage -0.01 -0.09 -9.05
Infiltrated 0.15
Precip. 2.00
Imp. Inflow 0.04 1.86 29.37
Perv.Inflow 0.01 0.35 7.94
Basin stayon(in) -60.36
Total Stayon(in) 1.53
Mass Balance checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 1.502551e-001
vinf difference (%)_ -0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 9.246062e-002
vrech difference (%)_ -0.0
dvsoil=inf-rech-et
dvsoil= 5.657247e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= 2.304185e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 5.0
max time ponded (h)= 5.0
total time Rz saturated (h)= 5.0
total time Rz at wilting point (h)= 0.0
total time Tz saturated (p)= 5.5
max time Rz saturated (h)= 5.0
max time Rz at wilting point (h)= 0.0
max time Tz saturated (p)= 5.5
near saturated times for simulation= 1
16.5 5.0
wilting point times for simulation= 0
0.0 0.0
ponded times for simulation= 1
16.8 5.0
overflow times for simulation=
Page 1

Permit No. ~XP G~' UU~ I Y 2.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
DWO Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : ~~ QCf ~~' ~..i ~
Contact Person: F~(u.('G~~ C~ ~1eliN
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level -
(fmsl).
,;
Soils Report Summary ~ , i., ~ /
In-Situ Soil Type L ~ ,
In-Situ Soil Infiltration Rate ? ~ ~ ~ in./hr. (the most restrictive soil layer)
SHWT Elevation ~ (~ .~ ft. (Seasonal High Water Table elevation) '` ' ''}
Planting Soi] Texture (C)GYY~ G. (lit (must be a sandy loam, loamy sand or loam texture)
Planting Soil Infiltration Rate .Z . ~ in./hr.
Basin Design Parameters
Drainage Area 54t~U0 sq.ft. (on-site and off=site drainage to the basin)
Impervious Area L 1700 sq.ft. (on-site and off-site drainage to the basin)
Design Storm 1 inch (1.5 inch event for SA waters, 1 inch event for others)
Design Volume ~ OZ c.f. (storage volume required)
Inlet Velocity ~~ fps
Drawdown Time ~ hours
Basin Elevations
Temporary Pool Elevation 3~ (< O fmsl (elevation of the bypass/outlet structure)
Planting Elevation ~<~ fmsl (elevation of the ground surface bottom)
Bottom Elevation 3T1f~.0 fmsl (eleva.tion of the bottom of the planting media)
Basin Dimensions
Basin Size ~ ft. x _~~ ft. = 2.~5o sq. ft. (surface area at basin bottom)
Basin Volume Provided ,~4~r )_ c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings
Number of plantings required ~ ~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided =Trees _ + Shrubs N 11`~ (at least 1 tree for every 3 shrubs)
This system (claeck one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
_~_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
-~ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
$~Nc~s RlI~UtRi;O ~~R NC~arN~'i3+~1P Y11ANvAL 1=.F~~CTIV~ ~UL~J 2; 2.007
d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~ ~'~ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
'~ g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ l~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
r~ suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~`' I i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
F~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~_ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~_ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

H~' m. Type of mulch layer and depth is specified on the plans.
Mme' n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
Nl~~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
~_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~_ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
Y~ t. Plans ensure that the installed system will meet design specifications (constricted or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shnibs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to deternune pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. Al] components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~~,ber~- Pol~nco
Title: ~~25`,G~~nf
Address: 8 S 09 191 b ri c, lit 17r-i ~ e 12, a.~ t/r g h N L 2~ (0l 2
Phone:
Signatu
Date:
Note: The egally 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, __5~~ . ~ \ 2~C-G2.-- , a Notary Public for the State of ~,~ t~~~~ l...a~t`a,~tRC74.
County of ~ Jl ~ Q,,~~ ~ , do hereby certify that O ("~'" ~1j~ 0.rf1 C t]
personally appeared before me this ~_day of ~ ~o~ ~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
C.mm)sslon Expires 4-18-212.
SEAL
My commission expires ~ r ~ ~~ ~b~ .~,
SWU-108 4.07
Page 4 of 4

BI09
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretent ion Area 9
PE#13A - Inlet velocity
•~~' open Channel Flow - Trapezoidal Cross section ~~
Side slope (H/lv)= 3
-----------------------
Discharge Ave. Depth ------------------------
Area Top Froude -------------
Slope n -------
Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s)
----------------------- (ft)
------------------------ ft)
------------- (ft)
---

0.24 0.46 0.20
-----------------------
0.52 3.21 0.20
------------------------
.00100 .0300
------------- ----
2.00
-------
Page 1

Bioretention Area 9
RECARGA 2.X
Date: 27-7u1-2007 15:25:00
Output File: Bioretention Area 9.txt
Number of time steps= 289
cPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 44
Pervious CN= 74
Facility Area (sf)= 2050
Trib. Area (AC)= 1.26
RATloimp2rg= 11.7803
RATIOperv2rg= 14.9931
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root Zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suction head (in)= -39
Max. underdrain flow (in/hr)= 0.008
underdrain diam (in)= 4.003
WATER BALANCE TERMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.11 1.00 100.00
Runoff 0.00 0.00 0.00
Recharge 0.07 0.63 62.42
Evaporation 0.00 0.01 0.85
underdrain 0.05 0.46 46.19
storage -0.01 -0.09 -9.46
Infiltrated 0.11
Precip. 1.94
Imp. Inflow 0.04 1.80 40.01
Perv.Inflow 0.01 0.32 9.10
Basin stayon(in) -63.50
Total Stayon(in) 1.48
Mass Balance checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 1.092775e-001
vinf difference (%)= 0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 6.821088e-002
vrech difference (%)_ -0.0
dvsoil=inf-rech-et
dvsoil= 4.013878e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= -6.912556e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 4.8
max time ponded (h)= 4.8
total time Rz saturated (h)= 5.0
total time Rz at wilting ppoint (h)= 0.0
total time TZ saturated (h)= 5.3
max time Rz saturated (h)= 5.0
max time RZ at wilting ppoint (h)= 0.0
max time TZ saturated (h)= 5.3
near saturated times for simulation= 1
16.5 5.0
wilting point times for simulation= 0
0.0 0.0
ponded times for simulation= 1
16.5 4.8
overflow times for simulation= 0
Page 1

Permit No. ~xfa ~ ~' UUrG ~
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
DWQ Stormwater Management Plan Review
A complete Stormwater management plan submittal includes a stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : ~~ QC~c.~r ~ i C~
Contact Person: ~ic,r~l d VetIN
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to: ~ 4
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fms]).
Soils Report Summary
In-Situ Soil Type
In-Situ Soil Infiltration Rate
SHWT Elevation
Planting Soil Texture
Planting Soil Infiltration Rate
L~, -~
? ~ ~ 3 in./hr. (the most restrictive soil layer)
~ ~ 't` ft. (Seasonal High Water Table elevation)
t)CtiYYt ~~CI (must be a sandy loam, loamy sand, or loam texture)
2 . d in./hr.
Basin Design Parameters ~~ ~QO
Drainage Area i sq.ft. (on-site and off-site drainage to the basin)
Impervious Area J~,~QV sq.ft. (on-site and off-site drainage to the basin)
Design Storm ~ inch (1.5 inch event for SA waters, 1 inch event for others)
Design Volume ~_ c.f. (storage volume required)
Inlet Velocity t~.t~~ fps
Drawdown Time t~ hours
Basin Elevations
Temporary Pool Elevation ~ 7~ fmsl (elevation of the bypass/outlet structure)
Planting Elevation ~~~~ fmsl (elevation of the ground sarrface bottom)
Bottom Elevation . ~~ fmsl (elevation of the bottom of the planting media)
Basin Dimensions
Basin Size i~ ft. x 3~ ft.
~~b sq. ft. (surface area at basin bottom)
Basin Volume Provided U ~ c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings ,~ /
Number of plantings required J v ~ stems (400 stems per acre of bioretention area is regctired at a rnini~num)
Total No. of plantings provided ~_ Trees + Shrubs N ~ L~ (at least I tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Cazolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justrfication. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
_~_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
-~ b. No vertical sand bed is proposed.
~ -~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~NC`v R~4u12~C1 Pi~R 1vco~N~2emP mr~rv~~aZ l:i=Frrc~ly~ .)v~.y 2; 200
__~1~___ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ ~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
F~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

HP~ m. Type of mulch layer and depth is specified on the plans.
~~" n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
~~ o. Plan details for the inlet and outlet stn~ctures are provided. (including dimensions and
elevations)
~`-' ' p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
"` "~_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
~~ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
~~,,~ length is 50 feet for SA waters, 30 feet for other waters).
'~_ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
H~_ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
3. Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shn~bs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media,
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications, If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c~b2c'+~ Polanco
Title: ~c'es~~c~ent
Address: 8 ~ 09 ~ I b riG ht 17~` ~ e 12 ~~ c~ ~ h (~1 C, 21(0) Z
Phone:
Signatu
Date:
Note: The egally 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, 'I~_ , . P ~ 2C~c~- , a Notary Public for the State of ~ Dc~~. l.. at-~,~~nc~,.
County of ~ Jl ~,~p , do hereby certify that O ~ ~" \ (j~ Cklf\ C t
personally appeared before me this ~_day of ~0~ ~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My G.mmisslon Expires 4-18-2012.
SEAL
My commission expires ~ ~ ~ 'O ~bl °~,
SwU-108 4.07
Page 4 of 4

BIO10
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 10
FES#l0A - Inlet Velocity
*'~ Open Channel Flow - Trapezoidal Cross Section **
Side slope (H/lv)= 3
-----------------------
Discharge Ave. Depth ------------------------
Area Top Froude -------------
Slope n -------
Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s) (ft)
--------
- ft)
------------- (ft)
-------
-----------------------
1.06 0.65 0.33
----------------------- --------------
-
1.63 5.96 0.22
------------------------ .00100 .0300
------------- 4.00
-------
Page 1

Bioretention Area 10
RECARGA 2.X
Date: 27-7u1-2007 15:29:14
output File: Bioretention Area l0.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 29
Pervious CN= 74
Facility Area (s f)= 500
Trib. Area (AC)= 0.43
RATIOimp2rg= 10.8639
RATIOperv2rg= 26.5977
LAYER DEPTH (in) Ksat (in/h r) TEXTURE
Depression 12 --- ---
Root Zone 24 4.14 1
Storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suc tion head (in)= -39
Max. Underdrain flow (in/h r)= 0.008
Underdrain diam (in)= 4.003
WATER BALANCE TE RMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.04 1.01 100.00
Runoff 0.00 0.00 0.00
Recharge 0.02 0.54 53.97
Evaporation 0.00 0.01 0.61
Underdrain 0.02 0.52 52.19
storage -0.00 -0.07 -6.77
Infiltrated 0.04
Precip. 2.29
Imp. Inflow 0.05 2.15 130.16
Perv.Inflow 0.03 0.49 73.14
Basin Stayon(in) -46.29
Total Stayon(in) 1.77
Mass Balance Checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 3.699040e-002
vinf difference (%)_ -0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 1.996507e-002
vrech difference (%)= 0.0
dvsoil=inf-rech-et
dvsoil= 1.679903e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= 1.152093e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 6.8
max time ponded (h)= 6.8
total time Rz saturated (h)= 7.8
total time Rz at wilting ppoint (h)=
total time Tz saturated (h)= 8.0
max time Rz saturated (h)= 7.8
max time Rz at wilting ppoint (h)=
max time Tz saturated (h)= 8.0
near saturated times for simulation=
19.3 7.8
wilting point times for simulation=
0.0 0.0
ponded times for simulation= 1
18.5 6.8
overflow times for simulation= 0
0.0
0.0
1
0
Page 1

Permit No. ~XP U-?"UU~I ~~
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
Tlxis form may be photocopied for use as an original.
DWQ Stormwater Management Plan Review:
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all Stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : ~ ~Cic:~~'
Contact Person: 1°~~~~~ C
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl). - ~ ~ '~
1
1
Soils Report Summary
In-Situ Soil Type O ~~' i ' ~ ` ~ i
In-Situ Soil Infiltration Rate ? ~ ~ ,~ in./hr. (the most restrictive soil layer)
SHWT Elevation ~ l`5 .F ft. (Seasonal High Water Table elevation) ~ '7 ,, , ~
Planting Soil Texture (~Grny ~ G~r1C1 (must be a sandy loam, loamy~a'nd;'or loam texture)
Planting Soil Infiltration Rate 2. ~ in./hr.
Basin Design Parameters
Drainage Area ~OSi ~aa sq.ft. (on-site and off-site drainage to the basin)
Impervious Area ~ ()~ sq.ft. (on-site and off-site drainage to the basin)
Design Storm 1 inch (1.5 inch event for SA waters, 1 inch event for otlaers)
Design Volume l ~1 c.f. (storage volume required)
Inlet Velocity 0-5( fps
Drawdown Time ~.~3,-hours
Basin Elevations
Temporary Pool Elevation (a ((3< D fmsl (elevation of the bypass/outlet structure)
Planting Elevation ~~~, a fmsl (elevation of the ground surface bottom)
Bottom Elevation ~L) v fmsl (elevation of the bottorn of the planting media)
Basin Dimensions
Basin Size 3~ ft. x ~ ft. _ ? ~~ ® sq. ft. (surface area at basin bottorn)
Basin Volume Provided SU c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings A ~
Number of plantings required 3 v ~ stems (400 stems per acre of bioretention urea is required at a rninirnum)
Total No. of plantings provided N ~ A- =Trees 1~,/~ + Shrubs N~ i~- (at least 1 tree for every 3 slzrc~bs)
This system (claeck one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
~_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
-~ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~Ncr Rar~v~rztp PrrR NL~~~v.2B~1P Y11ANv~L EpF~C~C1V~ .)~Zy 2; 2r,~~7
_ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ }~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
r~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~~ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

N~'`~ m. Type of mulch layer and depth is specified on the plans.
~~' n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
~" I o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
".~_ q. A benchmark is provided to determine the sediment accumulation in the basin area.
r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~_ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~_ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-]OS 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~c~b2r~ hol~nco
Title: ~c'eS~~c~ent
Address; 8509 {~IbriGht 17~`ve 12.a~t/~gh NC. 21(012
Phone:
Signatu
Date: __ (~~ I ~ ~ lj~`_
Note: The egally 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, ~ ~.. ~ \ 2~G2.-- , a Notary Public for the State of ~~ b~~~ 1... at" a~~t f1C7~.
County of ~ ~ ~ Q~,P , do hereby certify that O ~n~ \" (~~. O~,t~ c d
personally appeared before me this ~_day of ~ ~~~ / ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My C•mmission Expires 4-18-2012,
SEAL
My commission expires ~ ~ ~ 'b~ .~b~ :~
SWU-108 4.07
Page 4 of 4

Permit No. ~XP ~% ~' UU~ ~
(to be provided by DW Q)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use a.s an original.
DWQ Stormwater Management Plan Review
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all Stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : __CQ~Qcti~ ~i (:t~<L
Contact Person: Hc,ro~ C:~ ~CtC~,'
Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
R';- ~
'.
.~ - .,. ~~
Soils Report Summary , _ '
r~
In-Situ Soil Type ~ ~ ~r' ~
In-Situ Soil Infiltration Rate ? ~ ~ ~ in./hr. (the most restrictive soil layer)
SHWT Elevation ~ l7 •~' ft. (Setasonal High Water Table elevation) „fit ,
Planting Soil Texture (~ ~ Cni~1L` (must be a sandy loam, loamy sand, or loam texture)
Planting Soi] Infiltration Rate 2 . ~ in./hr.
Basin Design Parameters
Drainage Area sq.ft. (on-site and off-site drainage to the basin)
Impervious Area sq.ft. (on-site and off-site drainage to the basin)
Design Storm I inch (1.5 inch event for SA waters, 1 inch event for others)
Design Volume c.f. (storage volume required) + ~` ' _ -
Inlet Velocity fps -
Drawdown Time hours -

Basin Elevations ~/
Temporary Pool Elevation fmsl (elevation of the bypass/outlet structure) ~,;; ; ,,,.
Planting Elevation fmsl (elevation of the ground surface bottom)
Bottom Elevation fmsl (elevation of the bottom of the planting rnedia)
Basin Dimensions
Basin Size ft. x ft. _ _ sq. ft. (surface area at basin bottom)
Basin Volume Provided c.f.
SWU-108 4.07
Page 1 of 4

Basin Plantings
Number of plantings required _ stems (400 steins per acre of bioretention area is required at a minimum)
Total No. of plantings provided N~ A- Trees + Shrubs N 1 ~ (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
_ b. No vertical sand bed is proposed.
~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
$>LNer RIrGUtrt~O ~rrR NCQ~f~li2~~1P YYIANV~1L EpFrrCTIY~ aUly 2; 2007
d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~ ~~_ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~' f. Ponding depth of 6-12" is provided.
"'' 1-- g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
~ I~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
F~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~~~ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
__~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

H~' m. Type of mulch layer and depth is specified on the plans.
~~'~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
H~'~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
Nt q. A benchmark is provided to determine the sediment accumulation in the basin area.
~_ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~~~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~_ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
3. Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system fo perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shnibs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. Al] components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: _~c~b2r~- Pol~nco
Title: ~t'eS~~G~ent
Address: 8509 ~Ibright 17~~~e 12,a~C~Ic~h IBC. 2~(al2
Phone:
Signatu
Date:
Note; The ega]]y 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, 'li~V117-.~ ~, . P ~ Q.~C.~-. , a Notary Public for the State of ~~ n~~ 1...Qt'~~~tRCJ~.
County of ~ ~ ~ a~„~p , do hereby certify that O (' ~ \" Z1 x.r~ C h
personally appeared before me this ~~day of ~~~ ~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
KELLY E. PIERCE
NOTARY PUBLIC
WnKE COUNTY, N.C.
~Y Cammisslon Expires 4-18-2012.
SEAL
My commission expires ~' ~ ~ ~b1
SwU-108 4.07
Page 4 of 4

BI011
Date: 07-27-2007
Project: Cedar Ridge
Description: Bioretention Area 11
PE#2A - Inlet Velocity
~'° open channel Flow - Trapezoidal Cross Section 't~'
Side slope (H/lv)= 3
-------------------------------------------------------------------
Discharge Ave. Depth Area Top Froude Slope n Bottom
(cfs) vel. (ft) (sq ft) width No. (ft/ value width
(ft/s) (ft) ft) (ft)
-------------------------------------------------------------------
0.34 0.51 0.24 0.66 3.45 0.21 .00100 .0300 2.00
-------------------------------------------------------------------
Page 1

Bioretention Area 11
RECARGA 2.X
Date: 27-7u1-2007 15:33:20
Output File: Bioretention Area ll.txt
Number of time steps= 289
CPU elapsed time (s)= 0
INPUT TERMS
%Impervious= 34
Pervious CN= 74
Facility Area (sf)= 2000
Trib. Area (AC)= 1.51
RATloimp2rg= 11.1819
RATIOperv2rg= 21.7059
LAYER DEPTH (in) Ksat (in/hr) TEXTURE
Depression 12 --- ---
Root Zone 24 4.14 1
storage 4 10.00 1
Native --- 1.28 3
Init. Cond.: suc tion head (in)= -39
Max. underdrain flow (in/h r)= 0.008
underdrain diam (in)= 4.003
WATER BALANCE TE RMS
volume(ac-ft) Depth (in) %of Inflow
Inflow 0.13 1.00 100.00
Runoff 0.00 0.00 0.00
Recharge 0.08 0.58 58.08
Evaporation 0.00 0.01 0.70
underdrain 0.06 0.49 48.96
Storage -0.01 -0.08 -7.74
Infiltrated 0.13
Precip. 2.16
Imp. Inflow 0.05 2.02 35.89
Perv.Inflow 0.02 0.43 14.72
Basin stayon(in) -52.50
Total stayon(in) 1.67
Mass Balance Checks:
vinsoil=input-roff-dvh
vinsoil (ac-ft)= 1.297359e-001
vinf difference (%)_ -0.0
vrechargl=inf-et-dsws
vrechar~l (ac-ft)= 7.535017e-002
vrech difference (%)= 0.0
dvsoil=inf-rech-et
dvsoil= 5.348058e-002
dvsfce (ac-ft)= O.000OOOe+000
dvs2=input-roff-inf
dvs2 (ac-ft)= 4.608371e-017
PLANT SURVIVABILITY TERMS
total time ponded (h)= 5.8
max time ponded (h)= 5.8
total time RZ saturated (h)= 6.8
total time Rz at wilting point (h)=
total time Tz saturated (h)= 7.3
max time Rz saturated (h)= 6.8
max time Rz at wilting point (h)=
max time Tz saturated (h)= 7.3
near saturated times for simulation=
18.3 6.8
wilting point times for simulation=
0.0 0.0
ponded times for simulation= 1
17.5 5.8
overflow times for simulation= 0
0.0
0.0
1
0
Page 1

BIORETENTION
AREA TOTAL AREA
(sq ft) IMP
(sq ft) la Rv WQV
(cu ft)

1 82,900 17,500 0.21 0.240 1,658
2 90,300 34,000 0.38 0.389 2,926
3 52, 700 9, 200 0.17 0.207 910
4 72,100 26,100 0.36 0.376 2,258
5 82,800 21,800 0.26 0.287 1,980
6 27,900 9,600 0.34 0.360 836
7 33,100 22,600 0.68 0.665 1,833
8 75, 800 21, 200 0.41 0.420 2 656
9 54, 900 24, 000 0.44 0.443 2, 029
10 18, 700 5, 400 0.29 0.310 483
11 65,800 22,100 0.34 0.353 1,935

~wp o ~ - oo g ~ Y,~
STORMWATER
OPERATION & MAINTENANCE MANUAL
AND BUDGET
FOR BIO RETENTION AREAS
IN
CEDAR RIDGE SUBDIVISION
PHASES 2, 3, & 4
Prepared by:
Aiken & Yelle Associates, PA
3755 Benson Drive
Raleigh, NC 27609

OPERATIONS AND MAINTENACE MANUAL
SECTION I- INTRODUCTION:
This manual establishes procedures for maintenance and operation of stormwater in
accordance with the guidelines as set forth in the NCDWQ Stormwater Management
Design Manual. The NCDWQ rules require that stormwater devices be inspected
annually and that they be maintained in accordance with this document. Any repairs that
become necessary as a result of periodic inspections shall be completed within thirty (30)
calendar days of filing the report unless written approval of and extension is obtained
from the Town of Rolesville or NCDWQ.
The storm water management plan for this site consists of only water quality Bio
- __
Retention areas. The Bio Retention areas are to serve as a bio-filtration to reduce the
nitrogen loading from the proposed impervious surface.
This development will be developed in four phases as approved by the Town of
Rolesville as depicted on the preliminary site plan on file in the Town of Rolesville
Planning Department. All phased will be developed in accordance with construction
drawings entitled "Cedar Ridge Subdivision", prepared by Aiken & Yelle Associates,
PA, dated July 9, 2007 and approved by Town of Rolesville Central Engineering
Division. Therefore the water quality Bio Retention areas will also be installed by
phases. The Bio Retention areas to be constructed by phases are as follows:
A. Phase 2
Phase 2 of this development plan includes the construction of one (1) water quality
Bio Retention area as shown on the "Cedar Ridge Subdivision- Phase 2, 3, 4 and 5
Construction Drawings", prepared by this firm, dated 07/09/07.
Bio Retention area #1 will be constructed within a public drainage easement on Lot
111 of the proposed subdivision. More specifically the Bio Retention area will be
located down stream from storm sewer manhole #73. The Bio Retention surface area
required is be 1700 SF (approx. 95 feet in length and 18 feet in width) with side
slopes of 3 (H): 1'(V) and a depth of 1 foot.
B. Phase 3
Phase 3 of this development plan includes the construction of one (1) water quality
Bio Retention area as shown on the "Cedar Ridge Subdivision-.Phase 2, 3, 4 and 5
Construction Drawings", prepared by this firm, dated 07/09/07.
Bio Retention area #11 will be constructed on Lots 65 & 66 of the proposed
subdivision. More specifically the Bio Retention area will be located down stream
from storm sewer manhole #2 (SMH#2). The Bio Retention surface area required is
Page 2 of 14

2,000 SF (approx. 65 feet in length and 36 feet in width) with side slopes of 3 (H):
1'(V) and a depth of 1 foot.
C. Phase 4
Bio Retention area #2 will be constructed within a designated open space area
proposed for this subdivision. More specifically the Bio Retention area will be
located down stream from storm sewer manhole #61 B (SMH#61 B). The Bio
Retention surface area will be 3,000 SF (approx. 85 feet in length and 50 feet in
width) with side slopes of 3 (H): 1'(V) and a depth of 1 foot.
Bio Retention area #3 will be constructed within a designated open space area
proposed for this subdivision. More specifically the Bio Retention area will be
located down stream from storm sewer manhole #64 (SMH#64). The Bio Retention
surface area will be 950 SF (approx. 66 feet in length and 50 feet in width) with side
slopes of 3 (H): 1'(V) and a depth of 1 foot.
Bio Retention area #4 will be constructed within a public drainage easement on Lot
100 of the subdivision. More specifically the Bio Retention area will be located down
stream from storm sewer manhole #57 (SMH#57). The Bio Retention surface area
will be 2,300 SF (approx. 141 feet in length and 23 feet in width) with side slopes of
3 (H): 1'(V) and a depth of 9 inches.
Bio Retention area #5 will be constructed within a public drainage easement on Lot
94 of the subdivision. More specifically the Bio Retention area will be located down
stream from storm sewer manhole #51 (SMH#51). The Bio Retention surface area
will be 2,000 SF (approx. 100 feet in length and 27 feet in width) with side slopes of
3 (H): 1'(V) and a depth of 1 foot.
Bio Retention area #6 will be constructed within a public drainage easement on Lot
87 of the subdivision. More specifically the Bio Retention area will be located down
stream from storm sewer manhole #40 (SMH#40). The Bio Retention surface area
will be 850 SF (approx. 54 feet in length and 18 feet in width) with side slopes of 3
(H): 1'(V) and a depth of 1 foot.
Bio Retention area #7 will be constructed within a public drainage easement on Lot
80 of the subdivision. More specifically the Bio Retention area will be located down
stream from storm sewer manhole #33 (SMH#33). The Bio Retention surface area
will be 1,850 SF (approx. 64 feet in length and 39 feet in width) with side slopes of 3
(H): 1'(V) and a depth of 1 foot.
Bio Retention area #8 will be constructed within a public drainage easement on Lot
70 of the subdivision. More specifically the Bio Retention area will be located down
stream from storm sewer manhole #24 (SMH#24). The Bio Retention surface area
will be 2,700 SF (approx. 119 feet in length and 27 feet in width) with side slopes of
3 (H): 1'(V) and a depth of 1 foot.
Page 3 of 14

Bio Retention area #9 will be constructed within a designated open space area
proposed for this subdivision. More specifically the Bio Retention area will be
located down stream from storm sewer manhole # 13 (SMH# 13). The Bio Retention
surface area will be 2,050 SF (approx. 88 feet in length and 32 feet in width) with
side slopes of 3 (H): 1'(V) and a depth of 1 foot.
Bio Retention area #10 will be constructed within a designated open space area
proposed for this subdivision. More specifically the Bio Retention area will be
located down stream from storm sewer manhole #10 (SMH#10). The Bio Retention
surface area will be 500 SF (approx. 36 feet in length and 17 feet in width) with side
slopes of 3 (H): 1'(V) and a depth of 1 foot.
SECTION II- WATER QUALITY BIO RETENTION AREA MAINTENANCE
REQUIREMENTS:
1. Watering: Plants should be selected to be tolerant of the bioretention facility's
particular conditions. Watering should not be required after establishment
(about 2 to 3 years). However, watering may be required during prolonged dry
periods after plants are established.
2. Erosion Control: Inspect flow entrances, ponding area, and surface overflow areas
periodically. Replace soil, plant material, and/or mulch in areas where erosion
has occurred. Erosion problems should not occur with proper design except
during extreme weather events. If erosion problems do occur, the following
issues should be re-assessed: flow volumes from the contributing drainage area
and bioretention size; flow velocities and gradients within the bioretention
facility; flow dissipation and erosion protection methods in the pretreatment and
in-flow areas. If sediment is deposited in the bioretention facility, immediately
determine the source, remove excess deposits, and correct the problem.
3. Plant Material: Depending on plants selected and aesthetic requirements,
occasional pruning and removal of dead plant material may be necessary.
Replace all dead plants. However, if specific plants consistently have a high
mortality rate, assess the cause and replace with appropriate species. Periodic
weeding is necessary until groundcover plants are established. Weeding should
become less frequent if an appropriate plant density has been used.
4. Nutrients and Pesticides: The soil media and plant material should have been
selected for optimum fertility, plant establishment, and growth within the
particular conditions of each bioretention facility. Nutrient and pesticide inputs
should NOT be required and will degrade the pollutant processing capability of
the bioretention facility, as well as contribute to additional pollutant loading to
receiving waters. By design, bioretention facilities are typically specified in
watersheds where phosphorous and nitrogen levels are often elevated.
Therefore, these should not be limiting nutrients with regard to plant health. If
in question, have the soil analyzed for fertility.
Page 4 o f 1=l

5. Mulch: Replace mulch annually in bioretention facilities where heavy metal
deposition is likely (e.g., drainage areas that include commercial/industrial uses,
parking lots, or roads). In residential or other settings where metal deposition is
not a concern, replace or add mulch as needed to maintain a 2 to 4 inch depth at
least once every two years.
6. Soil media: Soil mixes for bioretention facilities are design to maintain long-term
fertility and pollutant processing capability. Estimates from metal attenuation
research indicates that metal accumulation should not present a toxicity concern
for at least 20 years in bioretention facilities (USEPA 2000). Further, replacing
mulch where heavy metal deposition is likely provides an additional factor of
safety for prolonged bioretention performance. If in question, have soil analyzed
for fertility and pollutant levels.
When the filtering capacity diminishes substantially (e.g., when water ponds on the
surface for more than 12 hours), remedial actions must be taken. One possible problem
is that underdrain pipe systems can become clogged. Annual flushing through pipe
cleanouts is recommended to facilitate unclogging of the pipes without disturbing the
bioretention areas. If the water still ponds for more than 12 hours, the top few inches of
material should be removed and replaced with fresh material. The removed sediments
should be disposed of in an acceptable manner (e.g., landfill). If that does not solve the
problem, more extensive rebuilding is required.
Examples of When to Perform Maintenance
Thin Mulch in the Bioretention Cell
^ Remove top layer of fill media when the pool does not drain quickly. The pool is
designed to drain within 12 hours.
Operation and Maintenance procedures:
-Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
-Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
-Heavy equipment will NEVER be driven over the bioretention cell.
-Special care will be taken to prevent sediment from entering the bioretention cell.
- Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.0 inches. Records of inspection and
maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
Page ~ of 1=l

Inspection and Maintenance Provisions for Bioretention Areas
BMP element Potential problems How to remediate the
roblem
The entire BMP Trash/debris is present Remove the trash/debris
The perimeter of the Areas of bare soil and/or Regrade the soil if
bioretention cell erosive gullies have necessary to remove the
formed. gully, and then plant a
ground cover and water
until it is established.
Provide lime and a one-
time fertilizer a plication.
The inlet device: pipe, the pipe is clogged (if Unclog the pipe. Dispose
stone verge or swale applicable). of the sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable). Regrade the swale if
necessary to smooth it
Erosion is occurring in over and provide erosion
the control devices such as
swale (if applicable). reinforced turf matting or
riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and
covered in sediment (if clogged stone and
applicable) replace with clean stone.
Inspection and Maintenance Provisions for Bioretention Areas continued
BMP element::: Potential problems How to remediate the
problem
The pretreatment area Flow is bypassing Regrade if necessary to
pretreatment area route all flow to the
and/or gullies have pretreatment area.
formed. Restabilize the area
after radin
Sediment has Search for the source of
accumulated to a depth the sediment and
greater than three remedy the problem if
inches. possible. Remove the
sediment and restabilize
the pretreatment area.
Page 6 of 1

Erosion has occurred. Provide additional
erosion protection such
as reinforced turf
matting or riprap if
needed to prevent future
erosion roblems.
Weeds are present Remove the weeds,
preferably by hand.
The bioretention cell: Best professional Prune according to best
Vegetation practices professional
show that pruning is practices.
needed
to maintain optimal plant
health.
Plants are dead, Determine the source of
diseased or the problem: soils,
dying. 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
Tree stakes/wires are Remove tree stake/wires
present (which can kill the tree if
six months after not removed).
lantin .
The bioretention cell: Mulch is breaking down Spot mulch if there are
soils and mulch or only random void areas.
has floated away. Replace whole mulch
layer if necessary.
Remove the remaining
much and replace with
triple shredded hard
wood mulch at a
maximum depth of three
inches.
Page 7 o f 1

The bioretention cell:
soils and mulch
The underdrain system
(if applicable
The drop inlet
The receiving water
SECTION V: OPERATION
A. Record Keeping
Soils and/or mulch are
clogged with sediment.
An annual soil test
shows that
pH has dropped or
heavy
metals have
accumulated in
the soil media.
Clogging has occurred
Clogging has occurred
The drop inlet is
damaged
Erosion or other signs of
damage have occurred
at the outlet.
. Determine the extent of
the clogging-remove and
replace either just the
top layers or the entire
media as needed.
Dispose of the spoil in
an appropriate off-site
location. Use triple
shredded hard wood
mulch at a maximum
depth of three inches.
Search for the source of
the sediment and
remedy the problem if
possible
Dolomitic lime shall be
applied as
recommended per the
soil test and toxic soils
shall be removed,
disposed of properly and
replaced
with new lantin media. '~
Wash out the underdrain
system
Clean out the drop inlet.
Dispose of the sediment
off-site.
Repair or replace the
drop inlet.
Contact the NC Division
of Water Quality 401
Oversight Unit at 919-
733-1786.
Operation of the storm water maintenance device should include recording of the
following:
• Annual Inspection Reports- Inspections should be conducted. A
professional engineer or his/her representative should conduct the
Page 8 of 1 ~

inspection. Reports should be kept on file with the Homeowner's
Association and a copy given to the Central Engineering Division of the
Town of Rolesville.
Observations- All visual observations should be recorded. Where periodic
visual inspections are performed following significant rainfall events (2"
of rainfall in 24 hours or greater event), these inspections should be logged
into the Periodic Inspections, Operation & Maintenance Form in Section
X of this manual.
Maintenance- Written reports of maintenance and/or repairs should be
recorded on the Periodic Inspections, Operation & Maintenance Form in
Section X of this manual.
B. Other Operational Procedures
The Owner's Association should maintain a complete and up-to-date set of plans
(as-built drawings) and all changes made to the storm water maintenance devices
over time should be recorded on the as-built plans.
SECTION VI: BUDGET
A. Annual Budget- Water Quality Bio Retention areas 1-12
Annual Inspection & Report
Registered Engineer 1 visit @ 8hrs/visit x $90/hour= $ 800.00
Miscellaneous Visits=
$ 500.00
Maintenance Cost for mowing, seeding fertilizing
And trash removal (2xs annual) $ 600.00
Sediment cost removal (every 5 years) annualized cost $ 600.00
Total Annual Budget (Water Quality Grass Lined Bio Retention areas=
$2,500.00
Page 9 o f 1 ~l

B. Total of Construction Cost for Water Quality Grass Line Bio Retention
areas.
Water Quality Bio Retention areas
Bio Retention areas 12 @ $6,000/per = $ 72,000.00
Seeding 664 LF (a~ $ 0.50/LF = $ 332 00
Sub-total = $ 72,332.00
Total Construction Cost for Water Quality Grass Line Bio Retention areas:
$72,332.00
Page 10 of 1 ~

WATER QUALITY BIO RETENTION AREA INSPECTION CHECKT.TST
CEDAR RIDGE SUBDIVISION
INSPECTOR/(S): DATE:
WEATHER: TIME:
Q
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U WATER QUALITY BIO RETENTION AREA

CHECK/CIRCLE
CONDITION NOTED OBSERVATION ACTION

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W a z
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Bio Retention area # Location:
Vegetation
Erosion
Sediment
Trash
Bio Retention area # Location:
Vegetation
Erosion
Sediment
Trash
Bio Retention area # Location:
Vegetation/ cover
Erosion
Sediment
Trash
Bio Retention area # Location:
Vegetation/ cover
Erosion
Sediment
Trash
Bio Retention area # Location:
Vegetation/ cover
Erosion
Sediment
Trash
Bio Retention area # Location:
Vegetation/ cover
Erosion
Sediment
Trash
GENERAL COMMENTS, SKETCHES & FIELD MEASUREMENTS:
Page 11 o f 1 ~

CEDAR RIDGE SUBDIVISION
WATER QUALITY BIO RETENTION AREAS
PERIODIC INSPECTION, OPERTIAON AND MAINTENANCE REECORDS
RAIN WEATHER GENERAL
DATE TIME OBSERVATIONS OR RECORDED BY
(in.) CONDITIONS COMMENTS
DATE ~ MAINTENANCE PERFORMED ~ COMMENTS ~ RECORDED BY
Page 12 o f 14

MAINTENANCE AGREEMENT
Project: Cedar Ridge Subdivision
Responsible Party: Cedar Ride Subdivision Homeowners' Association
Address: 8804 Albri ht Drive
Ralei h North Carolina
9-614-1
I. Monthly Inspection-
A. Visual inspection for signs of erosion after aone-inch or more rainfall event
over a 24-hour period to determine if any appreciable damage occurred which
would require repair to the stormwater device.
B. Remove thrash and debris from inlets and outlets, emergency spillways and
Bio Retention areas.
II. Quarterly Inspections and Maintenance:
A. Same as the monthly described above.
III. Semi-Annually and Maintenance:
A. Same as quarterly inspection
B. Grassing and mowing as required.
C. Reseed or re-vegetate disturbed vegetative areas.
IV. Annual Inspection and Maintenance:
A. Same as quarterly and semi-annual inspections.
B. Registered Engineer inspects and confirms that the stormwater devices are
operating properly and are in good physical condition. A copy of the
inspection reports in Section X of this report shall be submitted to the Central
Engineering Department of the Town of Rolesville. The date set as a deadline
to perform this annual inspection is one year after the date the as-built
drawings were first certified to the Town of Rolesville.
C. Sediment shall be removed if it is impeding the water flow.
Page 13 of 1 ~

V. General Maintenance:
A. Mowing of Bio Retention areas according to the season. Maximum grass
height of 4-6 inches.
B. In case the ownership of the Impoundment transfers, the current owner shall
within thirty (30) days of transfer of ownership, notify the Town of Rolesville
Engineering Department, Stormwater Management Division of such
ownership transfer.
C. This property and impoundment is also subject to the Stormwater Operation
and Maintenance Manual and budget filed relative to this project.
D. All trash and debris removal should occur as needed. Bioretention areas
should be inspected for trash and debris monthly.
I, ~©ber~ QO~G.y1c~ ,for ~c~t Lc~~e~1T ~t~~.~o¢~yt~y'~ ,~/t(. hereby
acknowledge that I, or my assigns, are the financially responsible party for
maintenance of these water quality Bio Retention areas. I or my assigns will perform
the maintenance as outlined in this document.
Signature: ~~~"~V ~ ~ Date: Z ~U ~
Company/Partnership: ~~ ~`~~ ~ ~ .
I, ~ '~~, a Notary Public for the State of (~ • C • ,County
of ~~~ ~~p~, , do hereby certify that ~ pbp~.~ Q o1 a.n.C O personally
appeared before me this,~Qday of 3' , 208±1 ,and acknowledge the due
execution of the foregoing instrument.
Witness my hand and official seal,
(SEAL)
KELLY E. PIERCE
NOTARY PUBLIC
WAKE COUNTY, N.C.
My Commission Expires A-18-2012.
•
Notary
My commission expires ~{ ~ ( ' e? Q 1 a.
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