20001449 Ver 1_Stormwater Info_20061115

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LandDesign _
TRANSMITTAL
223 North Graham Street, Charlotte, NC 28202 ~~ ~ ' 1~ ~,
V: 704.333.0325 F: 704.332.3246
DATE: 11/13/2006 NUMBER OF PAGES: 1
PROJECT #: 1005018
PROJECT NAME: Catawba Hills Village D Townhomes
TO: Ian McMillan BUS. PHONE:
NC Division of Water Quality Bus. FAx:
2321 Crabtree Blvd. BUS. MOBILE:
Suite 250 D LS~~o V ~ D
Raleigh NC 27604 v
cc: NOV 1 5 2006
WE ARE SENDING: VIA: PURPOSE: DENR -WATER QUALITY
WETLANDS AND STORluWATER BRANCH
® DRAWINGS ^ MAIL ®APPROVAL
^ SPECIFICATIONS ^ FAX ^ YOUR USE
^ APPLICATIONS ^ COURIER ^ YOUR INFORMATION
^ FEES ®FEDEX GROUND ^ REVIEW /COMMENT
^ REDLINES ^FEDEX OVERNIGHT ^ YOUR REQUEST
^ DISK / CD ^ HAND DELIVERY ^ SIGNATURE
^ OTHER ^ PICK UP
^ EMAIL
QUANTITY: ITEM: DESCRIPTION:
1 Revised plan sheets C-15 and C-17
1 Revised DWQ Worksheets
1 Copy of comments Per phone conversation with Sam Aghimren
1 Original submittal of wetland worksheets prior to
changes
NOTES:
Lan,
I included the original submittal of worksheets since you could not find the project on file. This may aid in your review of the revised
worksheets/design per Sam's comments.
Please call or email upon your receipt of this package.
Thank vn~i
FROM: Julie Roberts
JAR
If this document was delivered via FAX, the accompanying transmission contains confidential information intended only for the use of the individual of the entity named above.
If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on the contents of this facsimile
information is strictly prohibited. If you have received this FAX in error, please immediately notify us by telephone to arrange for disposition or return of the documents to us.
Charlotte NC
Washington DC Tampa FL Asheville NC Pinehurst NC Charlotte NC Nashville TN Beijing PRC

Catawba Hills Village D Townhomes
Phone call from Sam Aghimren with DWQ on 8/24/06
DWQ # 001449
Requested Modifications
Pond #1
1. Make bottom elevation 621.0 instead of 622.5
2. Make forebay volume 20% of total volume
3. Change orifice size from 1.5" to 2"
Pond #2
1. Make bottom elevation 621.0 instead of 622.5
2. Make forebay volume 20% of total volume
3. Change orifice size from 0.75" to 1.0"
Bioretention Area #1
1. Depth of ground water should be changed from "N/A" to 4.0'
2. Planting soil infiltration rate should be changed from 0.5 to 0.52
3. Inlet flow depth should be changed to 10".

.f'J~tl U:„~~k~,•, (lLlll`~l..tj {I`~I~ l'fl~lf ~.'.'~:I rlf7 ~l!'`~rl'.j.)C'. •lt.'-'"'i~.:'.l-..ll'r
LandDesi~n
TRANSMITTAL
223 North Graham Street, Charlotte, NC 28202
V: 704.333.0325 F: 704.332.3246
DATE: 9/5/2006
PROJECT NAME: Catawba Hills Village D Townhomes
TO: Ms. Cyndi Karoly
NC Division Of Water Quality - 401 Permit U
2321 Crabtree Blvd.
Suite 250
Raleigh NC 27604
NUMBER OF PAGES: 1
PROJECT #: 1005018
BUS. PHONE: [phone]
BUS. FAX: [phone]
BUS. MOBILE:
CC:
WE ARE SENDING: VIA:
PURPOSE:

® DRAWINGS
^ MAIL ___
®APPROVAL
^ SPECIFICATIONS ^ FAX ^ YOUR USE
® APPLICATIONS ^ COURIER ^ YOUR INFORMATION
^ FEES ®FEDEX GROUND ^ REVIEW /COMMENT
^ REDLINES ^FEDEX OVERNIGHT ^ YOUR REQUEST
^ DISK / CD ^ HAND DELIVERY ^ SIGNATURE
^ OTHER ^ PICK UP
^ EMAIL
QUANTITY: ITEM: DESCRIPTION:
1 Revised plan sheets C-15 and C-17
1 Revised DWQ Worksheets for Bioretention area
and Wetlands #1 and #2
NOTES:
i ne revisions are per comments relayed to us by Sam Aghimren. Please contact me if you have any questions or need clarification (704-333-
0325).
FROM: Julie Roberts
IAR
If this document was delivered via FAX, the accompanying transmission contains confidential information intended only for the use of the individual of the entity named above.
If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on the contents of this facsimile
information is strictly prohibited. If you have received this FAX in error, please immediately notify us by telephone to ar2nge for disposition or return of the documents to us.
Charlotte NC
Washington DC Tampa FL Asheville NC Pinehurst NC Charlotte NC Nashville TN Beijing PRC

Permit No. DD~~q'~
State of North Carolina (ro be provided by DwQ~
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form maybe photocopied for use as an original
DWO Stonnwater Management Plan Review
A complete stormwater management plan submittal includes an application form, a wet detention ba
supplement for each basin, .design calculations, and' plans and specifications showing all basin and outl t
structure details.
I. PROJECT INFORMATION
Project Name: Catawba Hills Subdivision - Village D Townhomes
Contact Person: Kevin W. Vogel
Phone Number: (~~) 378-77~~
For projects with multiple basins, specify which basin this worksheet applies to: wetland #2
elevations
Basin Bottom Elevation (02 ~ • ° ft
Permanent Pool Elevation s24:o ft
Temporary Pool Elevation s25.6o ft
areas
Permanent Pool Surface Area 3977 sq. ft
Drainage Area 1.93
ac.
Impervious Area 1 ~ ~
ac.
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
(water surface area at the orifice elevation)
(on-site and o,,~site drainage to the basin)
(o»-site and o,,~site drainage to the basin)
volumes
Permanent Pool Volume ~ ~ } 9 Z cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume 5,416 cu ft (volume detained above the permanent pool)
Forebay Volume I , 558 cu, ft, (approximately 20% of total volume)
Other parameters
SA/DA 1
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
Form SWU-102 Rev 3.99
2.13
(surface area to drainage area ratio from DWQ table)
~ ~ m. (2 to S day tem ora
4 92 1~ ry pool draw-down required)
in.
85 % (minimum 85% required)
o ~~~~d~ ~
Page 1 of 4 N0V 1 5 2006
U£1~1R • wSTORjr(WATER BR/J~H
yrE7W'IDS ~

Footnotes:
' When using the Division SA/DA tables, the correct SA~DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stornwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative. Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
JP
JP b.
. JP
c..
JP d.
• N/A
e.
JP
N/A
N/A
N/A
N/A
JP
JP
JP
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The forebay volume is approximately equal to 20% of the basin volume.
The temporary pool controls runoff from the design storm event. •
The temporary pool draws down in 2 to 5 days.
If required, a 30-foot vegetative filter is provided at•the outlet (include non-erosive flow
calculations)
f. ~ The basin length to width ratio is greater than 3:1.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
j. A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to nearestright-
of-way.
1. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an emergency.
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one)
This system (check one) 0 does
0 d 0 does not
0 incorporate a vegetated filter at the outlet.
oes does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

Maintenance activities shall be performed as follows:
1. After every significant runofl'producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the tempora ool occur
2 to 5 days as designed. rY P s within
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow ve
cover to maintain a maximum height of six inches, and remove trash as needed. getative
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
.reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to detettnine'the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads o.ss feet in the main pond, the sediment shall be remove
d.
When the permanent pool depth reads o.s3 ~ feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
U!! in the blanks)
Permanent Pool Elevation 42~i a
Sediment Re oval El. (~2,1•~x 75 0
-----`Z - •-"" /o Sediment Removal Elevation ` I ~ o
Bottom Ele ation t,0 0 ________________ ~ • ._ 75/0
_~L ------- ZS%
Bottom Elevation (~ , p
FOREBAY MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form SWU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: Catawba Hills, LLC
Title: Robert B. Dienst, Manager
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
I, ~~ F- c~-~w,J
a Notary Public for the State of _ N D(z-~(r~- ~~tY/~t~Ll~1~-
County of h t;Z{~,E1•f ~i>2~ , do hereby certify that 1 ~~~~~-~ (j ~~) ~5~, .
personally appeared before me this ~ day of ~~ ~Gi-~
- , Z+°rT~ fo, and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
~ = PUS
{ My Comm. t c~
~~, 30, 2009r
g''•..~URa ~~J.•• ,
SEAL
My commission expires rJI ~/ D
Form S WU-102 Rev 3.99 Page 4 of 4
Address: 125 Easton Drive, Mooresville, NC 28217

DWQ Project No. Po~144~
DMSION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : Catawba H~u~ c. ~h.~~.,,~,,,.. .,:~~_ _ _ ..
Contact Person: Kevin W. Vogel "'° ° ~ ~ vwrir~omes
For projects with multiple basins, speafy which basin this worksheet applies to: Bioretent on #176-7777
Permanent Pool Elevation
Temporary Pool Elevation
Bioretention Surface Area
.Drainage Area
Impervious Area
Rational C Coefficient
Size %
Inlet Velocity
Inlet flow depth
Depth to Ground Water
Planting Soil Infiltration Rate
In-Situ Soil Infiltration Rate
628.0 ft.
628.5 ft
1861.59 sq. tt.
0.74 ac.
0.432 ac.
0.65
7.0 %
3.69 fps
628.5 in
`I~0 ft.
0.5Z in./hr
~o in./hr.
REQUIRED I'T'EMS CHECKLIST
(elevation of the orifice invert out)
(elevation of the outlet structure invert in)
(on-site and off-site drainage to. the basin)
(on-site and off-site drainage to the basin)
(either 5% in wlsand under drain or 7% in w/o)
(the soil layer down to 4 feet)
(the soil layer below 4 feet or below the sand bed)
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 sbr-nwater 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.
A licants Initials
JP No vertical sand bed is proposed
The bioretention area is at least 40 feet by 15 feet.
Sheet flow is provided at inlet.
JP Water table depth is greater than 6 feet.
JP Minimum of 6" ponding is provided.
The ponded area will draw down in less than 4 days.
N/A Planting soil infiltration rate is greater than 0.52 in/hr.
The in-situ soil infiltration rate is greater than 0.2 in/hr.
A planting plan with species and densities is provided.
Mulch layer is specified in plans.
JP Planting soil meets minimum soil specifications (NCDENR Stonnwater Best Management
JP Practices Manual, April 1999)
JP Plan details for the bioretention area provided.
Plan details for the inlet and outlet are provided.
An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

DWQ Project No. 4 ~ -~ ~'4~
DMSION OF WATER QUALITY .LEVEL SPREADER WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : C~hwgq• ~ ~ g Di v i S ~ eN
Contact Person: K f V i-~ w Vow - V ~ `~ D T wN H•o nn s
Level Spreader ID:. Phone Number: (? 04) 37 ~ -7Z7 7
Level Spreader Length -j p
Drainage Area ft• (perpendicular to flow)
Impervious Area ~' 7`~ ~• (on-site and off-site drainage to the level spreader)
Maximum Filter Strip/Buffer Slope 0~- 3Z "'° ac' (o°n-site and off-site drainage to the level spreader)
grass ~° (6 h for forested, leaf littler cover, 8% for thick ground cover)'
Max. Discharge from a 10 Year Storm 3, ~ I cfs
Max. Discharge to Level Spreader - 3, ~ ~ cfs
Filter Strip/Buffer Vegetation nr,c,c ca...~Na
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method ~Rf. -TQ,v.r
REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and su rtin documentation is aftached. If a
requirement has not been met, attach an explanation of why.. At a minimum, a complete stormwate~management plan submittal indudes
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.
Applicants Initials .
~ Level.spreader is at least 13 ft. per cfs for thick ground cover
litter.
~ Pre-Form Scour Holes are on flat slopes only
ATP No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document
or grass or 100 ft per cfs in canopied forest with leaf
Bypass method is specified (if applicable) and plan details and ca~ulations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No strudures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided,
' Level spreaders in series can be used on slopes of up to 15°h in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.

Bioretention Facilities O eration and Maintenance A reement:
The homeowners association is responsible to periodically clean the facility, remulch and replace dead,
dying or diseased plant material. Under no circumstances will there be allowed to have any sediment or
erosion transported material to the bioretention facilities of any other influent which may create an
impermeable layer on the facilities.
The bioretention system is defined as the retention area (ponding area), mulch and landscaping within the
retention area, amended soil or planting soil subgrade and subdrain with gravel bed and filter fabric.
For the first couple of years, plants and trees may need water until they become established.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Visually inspect and repair any eroded areas, remove trash and debris.
b. Re-mulch any void areas by hand as needed.
c. After rainstorms, inspect the retention cell and make sure drainage paths are clear and
that ponding water dissipates over 4-6 hours. Keep in mind, the bioretention cell is not a pond.
should not provide a breeding ground for mosquitoes. Mosquitoes need at least 4 days of
standing water to develop as larva.
d. Weed regularly, if needed.
2. Every 6 months:
a. Add a fresh layer of mulch'as needed. The previous mulch niay be removed and discarded to an
appropriate disposal area or retained if it is decayed. The mulch should be placed to depths not to
exceed 3". Seeded ground cover.or grass areas should not receive mulching.
b. Visually inspect vegetation for disease or pest problems, if treatment is warranted use least toxic
approach. Remove and replace all dead and diseased vegetation considered beyond treatment.
3. Annually: ~ .
a. Check the pH of the planting soils. Apply an alkaline. product, such as limestone, if needed.
b. Prune excess growth. Trimmed materials may be recycled back in the replenished mulch or
land filled if there is a concern of heavy metals accumulation.
c. Core aeration or cultivating of unvegetated areas may be required to ensure adequate filtration.
d. The overflow structure should be inspected to ensure that it is functioning. Accumulated
trash and debris should be removed as necessary.

I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: Catawba Hills LLC
Title: Robert B. Dienst Manager
Address: 125 Sharon Lane Mooresville NC 28217
Phone: [phone] ~
Signature:
Date: p
Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been sold and a resident of the subdivision has been named the president.
I' ~ ~ ~ ~)20~/N , a Notary Public for the State of V1?i
County of ' , do hereby certify that _ (2b~~yL.-T i~3 , ~ ~ ~-~ T ~'~'~^I ~---
personally appeared before me this Z day of A~l~,u--
execution of the forgoing wet [wetland] detention basin maintenance requi~~tsn Witne swmvhand antis
official seal, _ ~ _,
SEAL '-~~~ 1 -~ " v v v ~~
My commission expires ~ r 3b/p ~
,..~~
EGA F• eiq •.
O '
N01~RY ti ~ ~;
PlIBM~
MY
~~ =v F
•• ,~ •

Permit No. ~D`144q
State of North .Carolina (ro be provided by DwQ,~
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form maybe photocopied for use as an original
DWO Stormwater Management Plan Review
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
I. PROJECT INFORMATION
Project Name: Catawba Hills Subdivision - Village D Townhomes
Contact Person: Kevin W. Vogel
Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: wetland #1
elevations
Basin Bottom Elevation X21.0 ft.
Permanent Pool Elevation s24.o ft
Temporary Pool Elevation 62s.so ft.
areas
Permanent Pool Surface Area so5s sq ft
Drainage Area 9.as
ac.
Impervious Area 4.72
ac.
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA ~
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
Form S WU-102 Rev 3.99
/y. 32~
cu. ft.
19,051 cu. ft.
? ~~D`' cu. ft.
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
(water surface area at the orifice elevation)
(on-site and o, f~site drainage to the basin)
(on-site and off-site drainage to the basin)
(combined volume of main basin and forebay)
(volume detained above the permanent pool)
(approximately 20% of total volume)
2.06
- (surface area to drainage area ratio from DWQ table)
2'0 in• (2 to S day temporary pool draw-down required)
4.92 (50-yr 6 hr)
in.
85 % (minimum 8S% required)
Page 1 of 4

Foot- notes:
' When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR BMP manual provides design tables for both 85%TSS removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stonnwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural' Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and sup ortin
documentation is attached. If the applicant has designated an agent in the Stormwater Management Penm
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
JP
JP
a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet)
b

JP .
. The forebay volume is approximately equal to 20% of the basin volume

JP .
c. The tem or ~ .
P azY pool controls runoff from the design storm event

JP .
d. The temporary pool draws down in 2 to 5 days.
~
e. If required, a 30=foot vegetative- filter is provided at the outlet (include non-erosive flow
calculations)
JP

JP
f. The basin length to width ratio is greater than 3:1.
N/A g.. The basin side. slopes above the permanent pool are no steeper than 3:1

JP ,
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less show detail
i
V
( )
N/A .
egetative cover above the permanent pool elevation is specified
JP .
j. A trash rack or similaz device is provided for both the overflow and orifice
.
k. A recorded drainage easement is provided for each basin including access to nearest -
n
ht
f
JP g
o
-way.
1. If the basin is used for sediment and erosion control during construction, clean out of the
ba
i
i

JP s
n
s specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an e
mergency.
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one)
This system (check one) 0 does
0 d 0 does not incorporate a vegetated filter at the outlet.
oes 0 does not incorporate pretreatment other than a forebay.
Form S WU- ] 02 Rev 3.99
Page 2 of 4

Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads o.sa feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads o.s3 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
Ull !n the blanks)
Permanent Pool Elevation bZ'f . o
Sediment Re oval EI. ~ I.~S 75 0
-'-"""'----- Sediment Removal Elevation X02.1. ~
BottomEle ation t:21,t~ % ______________________ 75%
-------------- ------
Bottom Elevation ~I,,b 25%
FOREBAY MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form S WU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: Catawba Hills, LLC
Title: Robert ~ Dienst, Manager
(704) 309-n~~~
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
I, -~~ ~ ~~vv ~r' , a Notary Public for the State of
County of ~],i~i(,~.1I~~r/~ j~~~ , do hereby certify that _ ~f71i'~I2~ g ; ~ ~ ~{~~'
personally appeared before me this Z day of ~~C~N~ , ?ia~~, and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness'my hand and official seal,
~~d.••~;Gp F. 8g0~1.
~ r''~NOTARY''ti,4Z
PUBUC t=
~ ~ ~~~
30, 200 fr
s, ....... ~ r
y'••~~R~ Cw..•••°
SEAL
~~ V~-~
My commission expires_ ~I ~jb' c~Gj
Form SWU-102 Rev 3.99 Page 4 of4
Address: 125 Easton Drive, Mooresville, NC 28217

,~--~
LandlL~
~ urban design planning crvif engineering far.dscape archrteCurc
TRANSMITTAL
223 North Graham Street, Charlotte, NC 28202
V: 704.333.0325 F: 704.332.3246
~~ -1
DATE: 3/9/2006 ~~Py OF OR~(,fntl4t.sVa~'c'f"kNUM ER OF PAGES: 1
PROJECT NAME: Catawba Hills Village D ome ~ ~IZC PR ECT #: 1005018
TO: Ms. Cyndi Karoly I'~~1~.LKf7D AlS gU .PHONE: [phone]
NC Division Of Water Quality - 401 Permit U BUS. FAX: [phone]
2321 Crabtree Blvd. Bus. MOBILE:
Suite 250
Raleigh NC 27604
CC:
WE ARE SENDING:
VIA:
PURPOSE:
DRAWINGS
^ SPECIFICATIONS
^X] APPLICATIONS
^ FEES
^ REDLINES
^ DISK / CD
^ OTHER
^ MAIL
^ FAX
^ COURIER
^ FEDEX GROUND
® FEDEX OVERNIGHT
^ HAND DELIVERY
^ PICK UP
^ EMAIL
® APPROVAL
^ YOUR USE
^ YOUR INFORMATION
^ REVIEW /COMMENT
^ YOUR REQUEST
^ SIGNATURE
QUANTITY: ITEM: DESCRIPTION:
3 Sets of Plans
2 Revised Detention Calculations
1 DWQ Worksheets for Bioretention, level
spreader, and 2 wetlands along with the
maintenance agreements
NOTES:
Cyndi:
Please do not hesitate to call me at 704.376.7777 should you have any questions or comments.
FROM: Jeremy Pruett JJP
If this document was delivered via FAX, the accompanying transmission contains confidential information intended only for the use of the individual of the entity named above.
If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on the contents of this facsimile
information is strictly prohibited. If you have received this FAX in error, please immediately notify us by telephone to arrange for disposition or return of the documents to us.
Charlotte NC
Washington DC Tampa FL Asheville NC Pinehurst NC Charlotte NC Nashville TN Beijing PRC

Permit No. 00"~ q'4°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
WET DETENTION BASIN SUPPLEMENT
This form may 6e photocopied for use as an original
DWO Stormwater Management Plan Review
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, .design calculations, and plans and specifications showing all basin and outlet
structure details.
I. PROJECT INFORMATION
Catawba Hills Subdivision - Village D Townhomes
Project Name:
Contact Person: Kevin w. Vogel Phone Number: ,' 7oa 13~s-7~7~
For projects with multiple basins, specify which basin this worksheet applies to: wetland #2
elevations
Basin Bottom Elevation
Permanent Pool Elevation
Temporary Pool Elevation
x22.5
ft• '(floor of the basin)
s24:o ft, (elevation of the orifice)
s25.bo ft. (elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area 3977 sq. ft.
Drainage Area ~ ~ 93 ac.
Impervious Area 1.00
ac.
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA1
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
Form SWU-102 Rev 3.99
(water surface area at the orifice elevation)
(on-site and o, ff site drainage to the basin)
(on-site and o, f,~`-site drainage to the basin)
7,533 cu. ft. (combined volume of main basin and forebay)
5,416 cu. ft. (volume detained above the permanent pool)
1,943 cu. ft. (approximately 20% of total volume)
2.13
(surface area to drainage area ratio from DWQ table)
0.75 ~ 2 to S da tem ora
( Y P ry pool draw-down required)
4.92
in.
85 % (minimum 8S% required)
. GCS ~=~aC~ p
Page 1 of 4 NUV 1 ~ Z~O6
UENR -WATER QUALITY
WETLANDS ANO STONIdWATEIt BRANCH

Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90%TSS removal. The NCDENR BMP manual provides design tables for both 85%TSS removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative. Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
JP
JP
.JP
JP
N/A
JP
N/A
N/A
N/A
N/A
JP
JP
JP
a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
e. If required, a'30-foot vegetative filter'is provided at'the outlet (include non-erosive flow
calculations)
f. ~ The basin length to width ratio is greater than 3:1. .
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to nearestright-
of-way.
1. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an emergency.
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one) 0 does 0 does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does 0 does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
.reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine`the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads o.s3
When the permanent pool depth reads o.s3
Sediment
Bottom
gal El. (022.13
~ation ~L(, S
C
FOREBAY
feet in the main pond, the sediment shall be removed.
feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
Ull in the blanks)
Permanent Pool Elevation 42~ n
Sediment Removal Elevation 6ZZ. !; 75 /o
----------------------------------------
Bottom Elevation (~ Zl. S = 25%
MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form SWU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: Catawba Hills, LLC
Title: Robert B. Dienst, Manager
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
I' ~~'~ ~' ~ ~`~~ , a Notary Public for the State of D(LTr{' «t~1~ln1F~-
County of ~ ~ L~F~' (/r1-g, ~ do hereby certify that ~ 1~~G12~ (3 _ ~~ ~(S7 ~. .
personally appeared before me this ~ day of ~~ ~~ , ~7~-p (o ~ and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements
~.~ GPF. Bgply••.
.• ~
,~. ~ ~• .......~~ ,I- ,. .
~ ;~ NOTARY ~'•• i~ ~'•.
PUBLIC '~
s" ~...
~ = My Comm. E> ~
~ ~yMay 30, 2008: ? ~:
L
SEAL
My commission expires ~I ~l ~
Witness my hand and official seal,
Form SWU-102 Rev 3.99 Page 4 of 4
Address: 125 Easton Drive, Mooresville, NC 28217
Ph.,,,P• [phone]

DWQ Project No. po~144~
DMSION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : Catawba Hills Subdivision -Villa e D Townhomes
Contact Person: Kevin W. Voqel Phone Number: (704 )376-7777
For projects with multiple basins, speaty which basin this worksheet applies to: Bioretention #1
Permanent Pool Elevation 628.0 ff, (elevation of the orifice invert out)
Temporary Pool Elevation 628.5 fl. (elevation of the outlet structure invert in)
Bioretention Surface Area 1861.59 sq. ft.
.Drainage Area 0.74 ac, (ori-site and off-site drainage to.tlie basin)
Impervious Area 0.432 ac. (on-site and off-site drainage to the basin)
Rational C Coefficient 0.65
Size % 7.0 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity 3.69 fPs
Inlet flow depth 628,5 in
Depth to Ground Water N/A ff
Planting Soil Infiltration Rate 0.5 in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate 0.0 in./hr. (the soil layer below 4 feet or below the sand bed)
II. REQUIRED ITEMS CHECKLIST ~ - -
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.
A licants Initials
No vertical sand bed is
ro
osed
JP p
p
The bioretention area is at least 40 feet by 15 feet.
Sheet flow is provided at inlet

J P .

JP Water table depth is greater than 6 feet.
"
Minimum of 6
ponding is provided.

JP The ponded area will draw down in less than 4 days.

N/A Planting soil infiltration rate is greater than 0.52 in/hr.
The in-situ soil infiltration rate is greater than 0.2 in/hr.
A planting plan with species and densities is provided.
Mulch layer is specified in
lans

JP p
.
Planting soil meets minimum soil s
if
ti
pec
ica
ons (NCDENR Stormwater Best Management
Practices Manual, April 1999)
JP Plan details for the bioretention are
id
d

J P a prov
e
.
Plan details for the inlet and outlet
id
are prov
ed.
An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

DWO Project
©o-1~4g
DNISION OF WATER QUALITY • LEVEL SPREADER WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name: Ca--rkwBA~ ~i~~s $ugD~ViS~eN -V1LLA•~f. D TpwN~roM~t
Contact Person; KtV i.,r w. VoG-EL Phone Number: (? 04) 37 a -7277
Level Spreader ID: .
Level Spreader Length ~ 0 ft
Drainage Area fi.7d~ ac.
Impervious Area _ 0.432 ac.
Maximum Filter Strip/Buffer Slope re %
grass
Max. Discharge from a 10 Year Storm 3, r I cfs
Max. Discharge to Level Spreader _ 3, r i cfs
Filter Strip/Buffer Vegetation
Pre-treatment or Bypass Method
REQUIRED ITEMS CHECKLIST
TRICK GRAND
~R£ -T2frl~fYVq;~,rr
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick groundcover)*
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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.
A~olicants Initials
SP Level .spreader is at least 13 ft. per cfs for thick ground cover or grass or t00 ft per cfs in canopied forest with leaf
litter.
7P Pre-Form Scour Holes are on flat slopes only
ATP No structures are located in protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
Bypass method is specified (if applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
* Level spreaders in series can be used on slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.

Bioretention Facilities Operation and Maintenance Agreement•
The homeowners association is responsible to periodically clean the facility, remulch and replace dead,
dying or diseased plant material. Under no circumstances will there be allowed to have any sediment or
erosion transported material to the bioretention facilities of any other influent which may create an
impermeable layer on the facilities.
The bioretention system is defined as the retention area (ponding area), mulch and landscaping within the
retention area, amended soil or planting soil subgrade and subdrain with gravel bed and filter fabric.
For the first couple of years, plants and trees may need water until they become established.
Maintenance activities shall be performed as follows:
After every signii'icant runoff producing rainfall event and at least monthly:
a. Visually inspect and repair any eroded areas, remove trash and debris.
b. Re-mulch any void areas by hand as needed.
c. After rainstorms, inspect the retention cell and make sure drainage paths are clear and
that ponding water dissipates over 4-6 hours. Keep in mind, the bioretention cell is not a pond. It
should not provide a breeding ground for mosquitoes. Mosquitoes need at least 4 days of
standing water to develop as larva.
d. Weed regularly, if needed.
2. Every 6 moritfis: .
a. Add a fresh layer of mulch'as needed. The previous mulch may be removed and discarded to an
appropriate disposal area or retained if it is decayed. The mulch should be placed to depths not to
exceed 3". Seeded ground cover.or grass areas should not receive mulching.
b. Visually inspect vegetation for disease or pest problems, if treatment is warranted use least toxic
approach. Remove and replace all dead and diseased vegetation considered beyond treatment.
3. Annually:
a. Check the pH of the planting soils. Apply an alkaline. product, such as limestone, if needed.
b. Prune excess growth. Trimmed materials may be recycled back in the replenished mulch or
land filled if there is a concern of heavy metals accumulation.
c. Core aeration or cultivating of unvegetated areas may be required to ensure adequate filtration.
d. The overflow structure should be inspected to ensure that it is functioning. Accumulated
trash and debris should be removed as necessary.

I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: _ Catawba Hills. LLC
Title: Robert B. Dienst Manager
Address: 125 Sharon Lane. Mooresville NC 28217
Phone: [phone] ~
Signature:
Date: p
Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been sold and a resident of the subdivision has been named the president.
I, ~~' ~` ~Y~CJV`/N , a Notary Public for the State of ~( ~,~(,t~--
Counry_ of 'M _, do hereby certify that (~13LYL~ F3 . ~ I C-N -T-
personally appeared before me this 2~ day of 1~lA~GN-- ~g~, and acknowledge the due
execution of the forgoing wet [wetland) detention basin maintenance requirements. Witness my hand and
official seal,'1 _ ~„~, r-,
SEAL `"- -"
My commission expires ~ (3d/ o ~
Gp F. B '•.
~f NOTgRY ': ~ ~:
PUBLIC ';
~ =MYCom ~
m• ~~es:
04?~'~, 2008,,~.~

PennitNo. ©D`144°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
WET DETENTION BASIN SUPPLEMENT
This form may 6e photocopied for use as an original
DWO Stormwater Management Plan Review
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specif cations showing all basin and outlet
structure details.
I. PROJECT INFORMATION
Project Name:
Catawba Hills Subdivision - Village D Townhomes
Contact Person: Kevin W. Vogel Phone Number: (704 37s-7777
For projects with multiple basins, specify which basin this worksheet applies to: wet-and #1
elevations
Basin Bottom Elevation ~ s22.5 ft
Permanent Pool Elevation s24.o ft
Temporary Pool Elevation s2s.so ft
areas
Permanent Pool Surface Area 9o5s sq ft
Drainage Area 9'89 ac.
Impervious Area 4.72 ac.
volumes
(floor of the basin) •
(elevation of the orifice)
(elevation of the discharge structure overflow)
(water surface area at the orifice elevation)
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
Permanent Pool Volume 13,527 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume 19,051 cu. ft. (volume detained above the permanent pool)
Forebay Volume 2,714 cu. ft. (approximately 20% of total volume)
Other parameters
SA/DAi 2.os
Diameter of Orifice 1.5
Design Rainfall 4.92 (50-yr 6 hr)
Design TSS Removal 2 85
(surface area to drainage area ratio from DWQ table)
in. (2 to 5 day temporary pool draw-down required)
m.
(minimum 85% required)
Form S WU-102 Rev 3.99 Page i of 4

Footnotes:
' When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90%TSS removal. The NCDENR BMP manual provides design tables for both 85%TSS removal and 90%TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
~P a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
~P b. The forebay volume is approximately equal to 20% of the basin volume.
~P c. The temporary pool controls, runoff from the design storm event.
~P d. The temporary pool draws down in 2 to 5 days.
~P ~ ~ e. If required, a 30=foot vegetative filter is provided at the outlet (include non-erosive flow
calculations)
JP f. The basin len h to width ratio is
~ greater than 3:1.
~P g.. The basin side. slopes above the permanent pool are no steeper than 3:1.
N/A h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
~P i. Vegetative cover above the permanent pool elevation is specified.
N/A j, A trash rack or similar device is provided for both the overflow and orifice.
~P k. A recorded drainage easement is provided for each basin including access to nearest right-
, of-way.
JP 1. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
~P m. A mechanism is specified which will drain the basin for maintenance or an emergency.
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one) 0 does 0 does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does 0 does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original. design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall b'e' such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 0.63 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads o.ss feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
Ull in the blanks)
Permanent Pool Elevation bZ~. o
Sediment Re oval El. 22.13 75 0
--------------- - Sediment Removal Elevation (022.13 75%
Bottom Ele anon G21~5 % ----------------------------------------------
Bottom Elevation >~1.5 2$%
FOREBAY MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form S W1J-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: Catawba Hills, LLC
Robert ti Dienst, Manager
Address: 125 Easton Drive, Mooresville, NC 28217
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
I, ~~'~ ~ ~~~"v ~r' , a Notary Public for the State of ~Q~2~1~-+ Gil ~•(~
County of ~~ ~ , do hereby certify that ~~~~ ~ ; 1> ~ (il~(5T
personally appeared before me this Z day of .~1?~fL~'1' ,'?it7E~(~~ and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
.• ~ p~~.
,.0~, ~••.......•• • 2
.i NOTARY '•
PUBLIC =
~.~
,= My Comm. Expires: ~,
c~, s•1May 30, 2009.•,'x?
SEAL

My commission expires_ ~I /b ~ ~~
Form SWU-102 Rev 3.99 Page 4 of 4