20001449 Ver 1_More Info Received_20061113

7047175150 LANDDESIGN INC
FAX COVER
LandDesign ~a^ design planning civic engineering landscape architecture
04:35:31 p. m. 11-13-2006 1 i16
TO: -1..Ov h YI~LC'_ f Vl. l r 1 4~t~„
DATE: ~ ~ ~~
CC:
FROM:. ~~`-~ t 'C 1 ~~~~ ~}''S
RE:
PROJECT NAME:
PROJECT #:
FAX #: "l ~ ~ `" ~ ~' C~~~ ~ ~ # OF PAGES (including cover~~~
if this document eras delivered via FAX, the accomparrying transmission contains confidential information intended only for the use for
the individual of the entky named above. tf you are not the intended recipient, you are hereby notified that any disclosure, copying,
distribution or the taking of arty 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 disposEtion or return of the documents to us.
PO Boa ]6959 Charlotte, NC 287]6-6959 22J North Graham Scree[ Chubt[e, NC 28202 V: 704.]33.0325 F: 70.376.8235
NOV-13-2806 MON 16:14 TEL:[phone] NAME:DWQ-WETLANDS P. 1

7047175150 LANDDESIGN INC 04:35:49p.m. 11-13-2006 2,'16
Catawba Hills Vi11aQe D Townhomes
Phone call from Sam Aghimren with DWQ on 8/24/06
DWQ # 001449
Requested Modif cations
Pond #1
1.. Make bottom elevation 621.0 instead of 622.5
2. Make forebay volume 5,000 cf (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 1,500 cf (20% of total volume)
3. Change orifice size from 0.75" to 1 A"
Bioretention Area#1
I . 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".
NDU-13-2006 MON 16:15 TEL:[phone] NAME:DWQ-WETLANDS P. 2

7047175150 LANDDESIGN INC 04:36:05 p.m. 11-13-2006 3 i16
Lard
TRANSMITTAL
~rtaa~ ~;,1~~1 planni^g civil ensireerng lard>[a~e :irt^II~i'~JI':
223 North Graham Street, Charbtte, NC 28202
V: 704.333.D325 F: 704.332.3246
NUMBER OF PAGES: 1
DATE: 11/7312006 1005018
PROJECT #:
PROJECT NAME: Catawba Hills Village D Townhomes
BUS. PHONE:
TO. Ian McMillan
NC Division of Water duality sus. FAx:
2321 Crabtree Blvd. Bus. MOBILE.
Suite 250
Raleigh NC 27604
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-76 and C•17
1 Revised DYYQ Worksheets
1 Copy of comments Per phone conversation w[th Sam Aghimren
~ Original submittal of wetland worksheets prior bo
changes
unTFS
Ian,
I inGuded the original submittal of worksheets since you could not find the project on file. This may aid in your review of the revised
workstteetsldesign per Sam's comments.
Please call or email upon your receipt of this package.
Thank vrnr
JAR
FROM: Julie Roberts
If this document was delNered vfa FAX, the accompanying transmission contains confidential informaton intended only for the use of the individual of the entlty named above.
If you are not the intended redpient, you are hereby norifled that any disdosure, copying, diatributlon or the taking of any action in reliance on the cattents of this farsimile
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.
Washington DC Tampa FL Asheville NC
Charbtte NC
Pinehurst NC Charlotte NC Nashville TN Beijing PRC
NOV-13-2D06 MON 16:15 TEL:[phone] NAME:DWQ-WETLANDS P. 3

7047175150 LANDDESIGN INC 04:36:23 p.m. 11-13-2006 4 i16
Land.Desigri
TRANSMITTAL
l.r'.?hi') CiC'_J~~ ~)Iarlrlt°{,; CI'vII 1.-1~ICCCI'fl~? 'df'Cj3f.iI7C ilrr"11iC'.C~'Jr-:
223 Norih Graham Street, Charlotte, NC 28202
V 704.333.0325 F: 704.332.3246
DATE: 9/5!2006 NUMBER OF PAGES: 1
PROJECT NAME; Catawba Hills Village D Townhomes PROJECT ~: '1005018
T0: Ms. Cyndi Karoly BUS. PHONE: [phone]
NC Division Of Water Quality -401 Permit U BUS. FAX: (919} 733-6893
2321 Crabtree Blvd. Bus. MOBILE:
Suite 250
Raleigh NC 27604
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
UANTITY:
plan sheets C-15 and C-17
Ised DWQ Worksheets for eforetention area
Wetlands Mi and A2
NOTES:
The revisions era per comments relayed to us by Sam Aghimrert. Pease contact me H you have any questions or need clarification (704333-
0325).
FROM: Julie Roberts JAR
tt this document was delivered via F/Vt, the accompanying transmission cordains confidential informaton intended only for the use of the individual of the entlty named above.
If yw are not the intended recJpienl, ya, are hereby notified that any discbsure, copying, distribution or the taking of any action in reliance on the contents of this facsimile
information is strictly prohibited. K you have received this FAX in error, please immediately notify us by telephone to arrar>ge for disposition or return of the documents to us.
Washington DC Tampa FL Asheville NC
Charlotte NC
Pinehurst NC Charbtte NC Nashville TN Beijing PRC
NOU-13-2006 MON 16:15 TEL:[phone] NAME:DWQ-WETLANDS P. 4

7047175150
LANDDESIGN INC 04:36:41 p.m. 11-13-2006 5116
Permit No. Oa•-1 ~j°I
State of North Carolina (to be provided by DWQ,J
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopttr! for use as an original
DWO Stormwater Manaeement 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 - Yllage d Townhomes
Contact Person: Kevin w, vogei Phone Number: ~~ 37&n7r
For projects with multiple basins, specify which basin this worksheet applies to: Wetland #2
elevations .. ~ ~ .. .
$asin Bottom•Elevation (021.0.
ft. ~ (door of the basin) ~ •
Permanent Pool Elevation t324.o !}, (elevation of the orifice)
Temporary Pool Elevation s25.ao #}. (elevation of the discharge structure over,~low}
areas
Pernaanent Pool Surface Area 3,977 s .~ft.
q (water surface area at the orifice elevation)
Drainage Area 1' 93 ac. (on-site and of f sile drainage to the basin)
Impervious Area 1.0o ac. (on site and o,,~site drainage to the basin)
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA t
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
Form SWU-102 Rev 3.99
~'5~ cu. ft. (combined volume of main basin and forebay)
5,416
_ cu, ft. (volume detained above the permanent pool)
I, fioo cu, ft, (approximately lt7% of total volume)
2.13
(surface area to drainage area ratio from DI3'Q table}
+' ~ in. 2 to S da tem ora
( Y p ry pool draw-down required)
4.92
in.
85 % (minimum 8S% required)
Page 1 of 4
NOU-13-2006 MON 16:16 TEL:[phone] NAME:DWQ-WETLANDS P. 5

7047175150 LANDDESIGN INC 04:37:01 p.m. 11-13-2006 6;16
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 empbyed to determine the correct value for non-
standard table entries.
In the 20 coastal counties, the requirement far a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDSNR 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 fogowing 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 requireenegt has not been met, attach justification.
Applicants Initials
JP a. The ermanent
P pool depth is between 3 and 6 feet (required minimum of 3 feet}.
JP b. The foreba volume is a roximatel
y PP y equal to 20% of the basin volume.
JP a The ~ . .. ,
temporary poo! controls runoff from the design storm event.
JP d. The temporary pool draws down in 2 to S days.
Kin e. If re uir
q ed, a ~30-foot vegetative filter is provided at'tbe outlet (include non-erosive flow
calculations)
JP
f. • The basin length to width ratio is greater than 3:1.
NtA g. The basin side slo above the
1~ permanent pool are no steeper than 3:1.
Hia h. A submer ed and ve elated
g g perimeter shelf with a slope of 6:1 or less {show detail).
wA i. Vegetative cover above the
H/A permanent pool elevation is specified.
j. A trash rack or siarilar device is provided for both the overflow and orifice.
JP k. A recorded drainage easement is provided for each basin including access to nearestright-
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.
JP 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 Ater if one is provided.
This system (check one) 0 does 0 dcea not incorporate a vegetated fetter at the ouNet.
This system (check one) 0 does 0 does not incorporate pretreatment other than a forebay.
Form SWi1-102 Rev 3.99 Page 2 of 4
NOV-13-2D06 MON 16:16 TEL:[phone] NAME:DWQ-WETLANDS P. 6

7047175150 LANDDESIGN INC
Maintenance activities shall be performed as follows:
04:37.21 p.m. 1 1 -13-2006 7 i16
1. After every significant runoffproducing 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 S 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 wilt not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The mdasuring device used to determine`tht: sediment elevation shall be such that it will give an accurate
depth reading aad not readily penetrate into accumulated sediments. -
When the permanent pool depth reads o.ss 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
(Jill i+r the blmuFs)
Permanent Pod Elevation 4Z~ o
Sediment Re al El. 621.7~x 75 0
--------- •---- - o/ Sediment Removal Elevation ~/. 75%
Bottom E1e ation ~ -------------~------------------ ~-------- --_.
Bottom Elevation 4Li.o 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 SWU-102 Rev 3.99
Page 3 of 4
NOU-13-2006 MON 16:16 TEL:[phone] NAME:DWQ-WETLANDS P. 7

7047 1 751 50 LANDDESIGN INC 04:37:40 p.m- 11-13-2006 8 i16
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 g. Dienst, Manager
Address: 125 Easton Drive, ~llooresvilie, NC 282!7
Phon
Sign
Date:
Note: The legally 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, -~ ~~ ~r~~~ , a Notary Public for the State of_ND~-7--~' G~-t3Ltnli?~-
County of h ~~;fLl.-E1~1~P~(~/~-g, , ~do hereby oertify that ~ i20~"~Z'~ ~j- ~) ~iNs 7 .. .
personally appeared before me this ~ day of ~~i~~ , ~p fo, and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
Nt)TARIf
PUBIx
..+
r ~0 ~' ~~~~'r
SEAL
My commission expires ~1~~0
Form SWU-102 Rev 3.99
Pagc 4 of 4
NOV-13-2006 MON 16:17 TEL:[phone] NAME:DWQ-WETLANDS P. 8

7047175150 LANDDESIGN INC
DWQ ProieCt N0. ~"t4~
DIVISION OF w~TER pl1AL11Y - BIORETENTION AREA WORKSF~ET
04-37:58 p.m. 11-13-2006 9 i16
L PROJECT INFORMATION (please complete the following information):
Project Name : Catawba Hills Subdivision - Village D Totivnhomes
Contact Person; Kevin W. Vogel Phone Number: (704 1376-777"7
For projects with mukiple basins, speafy which basin this worksheet applies tfl: Bioretention ~1
Permanent Pool Elevation
Temporary Pool Elevation
628.0 ft.
628.5 ft.
(elevation of the orifice invert out)
(elevation of the outlet structure invert in)
8iaretention Surface Area
.Drainage A-ea
Impervious Area
Rational C Coeffiaent
Size % .
1861.59 sy. R.
0.74 ~.
a~,~ _ ac.
7.0 ~,
Inlet Velocity 3.69 ~
Inlet flow depth 628.5 m
Depth to Ground Water 9. v ~
Planting Sow Irrfltration Rate 0.5Z mJhr.
h-Sku Soil infiltration Rate ro _ _ in,lhr.
L REQUREO ITEMS CHECKLIST
{on-site and oS-site drainage to.the basin)
{on-site and otr-site drainage b the basin)
{either 596 h wlsarld under dram ar 796 in wloj
{the soil layer down to 4 feet)
{the sow layer bebw 4 feet or below the sand bed)
Initial in the space provided to indicate the fdbwing design requirements have been met and supportlng documentation Is attached: ~a
ragrarenaent has not been mar, attach err explanation of why. At a minimum, a complete stormwater rnanagernent plan sutimwtal indudes
a worksheet for each l3MP, design cak,ulalions, plans and specificatons showing ak BMPs and outlet structure details, a deiawed
drainage plan and a luky executed operation and maintenance agreement. An iruomplete sutamiltat package wiw resuk n a request for
additlonal irnforrnlation and wwf substantiaNy delay final review and approval of the project.
lice l • t .
No vertical sand bed is proposed
P The Iaioretention area is at least 40 feet by 15 feet,
~
~ Sheet tiow is provided et inlet.
JP Wafter table depth !s greater than 6 feet.

JP _
tAnimum of 6' ponding is provided.
The taonded area wiN draw down in tee than 4 days.
Plantirng sow infiltration rate is greater than 0.52 inlhr.
The in-situ soi infiltraton rate is greater ttmn 0.2 inltr.
A planting talon with spectres and denslfies is provided.
Mulch layer is specified in plans.
JP Planting sow meets minimum sal specifications (NCDFJVR Stonnwater t3est Management
Practices Manual, AprA 1999)
JP
- Dian details for the bioretertion area provided.
~ Plan details far the inlet and outlet are provided.
An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrafns beneath the planting sail are acceptable in the Piedmont and Mountains
NOV-13-2886 MON 16:17 TEL:[phone] NAME:DWQ-WETLANDS P• `~

7047175150 LANDDESIGN INC 04.38:19 p.m. 11-13-2006 10 i16
DWQ Project No. ©d -~ k~
DMSiON OF WATER QUALRY - LE1113 SPREADER WOftiCSHEE'T
L PRQIECT INFORMATION (please complete the fdbwing information):
Project Name: _~,Iar/~wgl4 --ruS Sk9Diyr5r•N -Vr~tAr.E. D "rausNt+eMt<t
Contact Person: _ KEU r~+ w. Vob[t Phone Number: (704} 3~ ~ -777 7 ..
[.eve) Spreader ID:
Level Spreader Length ? a fl. (perpendicular io flow)
Drainage Area _ 0.'74 aC. (on-site and cif-sib drainage to the level spreader)
Impervious Area 0.431 ac. (on-site and off--site drainage io the level spreader)
Maximum Filler StriplBuffer Sbpe G 9< (696 for forested, leaf Iktler c~v~, 896 for thick ground cover)"
9~
Max. Discharge from a 10 Year Storm 3. r t ds
Max. Discharge io Level Spreader 3. r t cds ..
F'~ter Sbfp/Buffer Vegetation ,r«ncr ~r~~ (thick ground cover or grass, canopied forest with leaf fitter
groundcover)
Pre-treatment or Bypass Method Pte. -Ta~,NrrwF„rr
1. REOURED (TENS CHECKLJST
Initial in the space provided to indicate the fdbvrfng design requiremems have been met and supporting documentation is 8tiadtEd. If a
regreremenf has not been met, attach an explanation of why., At a n-inimum, a complete stormwater management plan submittal inductee
a worksheet for each 13MP, design calculations, plans and spepfications showing aN BMPs and outiet stnx~ure details, a detaaed
drainage plan and a (oily executed operation and maintenance agreement. M incomplete sutxnlttaal package wiU result in a iequest for
additional inforrrration and wE subslantiaNy delay final review and approval of the project.
~leolican~ ~ .
JP Level spreader b at leant 13 ft. per cfs br thick ground cover or grass or 100 R per cis in canopied forest with leaf
litter.
~ Pre-Form Scour Hiles are on flat slopes onty
sP No structures are locaed in protected bufbrs"
If bypass method speafi®d in the Draft Level Spreader Design Option Document:
Bypass method is spedfied (il applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent tJter strip is hydraulicaAy and spatiatiy separate from the bypass
discharge.
No stnrdures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement inductee 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 1596 in forested areas with leaf littler cover or on slopes of up to 25% in areas
with flock ground cover or grass if designed according to the Drafi Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In arty event the second level spreader cannot be located in Zone 1 of a protected buffer area.
NOV-13-2DD6 MON 16:17 TEL:[phone] NAME:DWQ-WETLANDS P. 1D

7047175150 LANDDESIGN INC 04.38:38 p.m. 11-13-2006 11 ;16
Bioretention Facilities Operation and Maintenance Aareement•
The homeowners association is responsible to periodically clean the facility, remulch and replace dead,
dying or diseased plant material. Under no circumstances will there lie allowed to have any sediment or
erosion transported material to the bioretention fac8ities 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 sign cant 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 ce0 and make sure drainage paths are clear and
that ponding water dissipates over 4-6 hours. Keep in mind, the bioretentlon cell is not a pond. It
should not provide a breeding ground for mosquitoes. Mosquftoes 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 may be remflved artd 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.
Annually:
a. Check the pH of the planting soils. Apply an alkaline. product, such as Nmestone, if needed.
b. Prune excess growth. Trimmed materials may be recyded 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.
NOU-13-2006 MON 16:18 TEL:[phone] NAME:DWQ-WETLANDS P. 11

7047175150 LANDDESIGN INC 04:38:58 p.m. 11-13-2006 12 i16
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures Irsted 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 Hlis. LLC
Title: Robert 13: Dienst. Manaoer
Address_ 125 Sharon Lane. Mooresville. NC 28217
Phone: 309- 12
Signature:
Date: O
Note: The legally responsible party should not be a homeowners association unless more than 50°/a of the
lots have been sold and a resident of the subdivision has been named the president.
I, li~' ~ ~Zyi~/i'~ , a Notary Public for the State of '07 n~,~---
County ofLV1 _ do hereby certify that F3 • ~ T
personally appeared before me this 2 day of 1~tM8f.>~ ~ , ?~. and acknowledge the due
executbn of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,` _ _-.~,~ n
SEAL - - -
My commission expires ~ ~ 3bl ~ `~
D" . !~- ~, .. . .
~,`~~
~~• ;
lpv_~~a
NOV-13-2006 MON 16:18 TEL:[phone] NAME:DWQ-WETLANDS P. 12

7047175150 LANDDESIGNINC 04:39:15 p. m. 11-13-2006 13;16
Permit No. ©D`144q
(ro lre 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 maybe photocopied for use as an odgina!
DWO Storrnwater Manaeement 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 speci6eations showing alt basin and outlet
structure details.
I. PROJECT INFORMATION
Project Name: Catawba HiNs Subdivision - Vrllage D Townhomes
Contact Person: Kevin w. vogel ~ Phone Number: (~~) 37s-~~n
For projects with multiple basins, specify which basin this worksheet applies to: Wetland ~1
elevations
Basin Bottom Elevation ~ X21'0 ft. (floor of the basin)
Permanent Pool Elevation s2a.0 ft, (elevation of the or~ce)
Temporary Pool Elevation s2eso g, (elevation of the discharge structure over, flow)
areas .
Permanent Pool Surface Area 9o5s sq. ft. ~ (water surface area at the orifice elevation)
Drainage Area 9.89 ac. (on-site and o,,~`site drainage to the basin)
Imperv>ous Area 472 ac. (on-site and o
~'=site drai
t
th
b
_,
nage
o
e
asin)
volumes
Permanent Pool Volume 13.52;' cu. ft. {combined volume of main basin and forebay}
Temporary Pool Volume 19051 cu. ft. (volume detained above the permanent pool)
Forebay Volume 5. °0D cu. ft. (approximately 20% of total volume)
Other parameters
SA/DAi 2'06
{surface area to drainage area ratio from DWQ table)
Diameter of Orifice 2~0 in. (2 to S day temporary pool draw-down required)
Design Rainfall 4.92 (50-yr s hr) in.
Design TSS Removal Z 8s % (mi»imum 85% required)
Form SWU-1Q2 Rev 3.99 Page 1 of 4
NOU-13-2DD6 MON 16:18 TEL:[phone] NAME:DWQ-WETLANDS P. 13

7047175150 LANDDESIGN INC 04:39.35 p.m. 11-13-2006 14 i16
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 °/s and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
1 In the 20 coastal counties, the requirement for a vegetative feller may be waived if the wet detention basin is designed to provide
90% TS5 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 Naturdi~ Resources, February 1999) and Administrative Code
Section: IS A NCAC 2H .1008.
Iaitial 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 Fotm, the agent may initial below. If a req>slrement 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).
JP
. ~ ~ b.
~ The forebay volume is approximately equal to 20°10 of the basin volume.
~P c. ,The temporary pool con11'o1.S
runoff from the design storm event

~~
d. ,
.
The temporary pool draws dawn in 2 to 5 days.
~P ~ e. If required, a 30~foot vegetative filter is provided at the outlet (include non-erosive ~flovir
calculations)
JP f. The basin length to width ratio is greater than 3:1.
~p g.. The basin side. slopes above the permanent pool are no steeper than 3:1.
wa h. A submerged and vegetated perimeter shelf with a slope of b: l or Less (show detail).
~P i. Vegetative cover above the permanent pool elevation is specified.
wA j, A trash rack or sinvlar device is provided for both the overflow and orifice.
JP 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.
JP 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 of4
NOU-13-2006 MON 16:19 TEL:[phone] NAME:DWQ-WETLANDS P. 14

7047175150 LANDDESIGN INC
Maintenance activities shall be performed as follows:
04-39:55 p.m. 1 1 -13-2006 15 !16
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 beIow). 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 ar stream, etc.).
The measuring device used to deteimiae 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 !)_83
Sediment Re val Et. ~ ! ,~5
Bottom Eie ation G 2 i . O
FOREBAY
feet in the main pond, the sediment shall be removed.
feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in thie blanks)
Pemlanent Pool Elevation b1~, o
Sediment Removal Elevation bZJ. ~$ 73"~0
Bottom Elevation ~ --------- 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 S W U-102 Rev 3.99
Page 3 of 4
NOU-13-2006 MON 16:19 TEL:[phone] NAME:DWQ-WETLANDS P. 15

7047175150 LANDDESIGN INC 04:40:14 p.m. 11-13-2006 16 i16
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.
Note: The legally responsible party should not be a homeowners association unless more than 50'/0 of the bts have been sold and a
resident of the subdivision has been gamed the president.
I, `~~~~~ ~' 8~/~ ,., , a Notary Public for the State of "i't-~ G>~~lr.~f~
County of ~~ ~. do hereby certify that ' ~~ ~1j ~ ~{~-~
personally appeared before me this ..Z, day of NIA~f~' , ?~tJl/~ and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness'my hand and official seal,
I~..~~ ~0~~,
NOTARY
WS1JC
~~OOY ~'
SEAL
~~ ~ v~
My commission expires ~ :/~ ~
Form SWU•102 Rev 3.99
Page 4 of 4
NOV-13-2DD6 MON 16:19 TEL:[phone] NAME:DWQ-WETLANDS P. 16
Print name: Catawba Hills, LLC
Title' Robert ~ Dienst, Manager
Address: 125 Easton prive, Mooresville, NC 28217