20060180 Ver 1_More Info Received_20070411

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•
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A S S O C I A T E S
April 10, 2007
Ms. Annette Lucas, Environmental Engineer III
NC Division of Water Quality
401 Oversight /Express Permitting Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
~~ ~ ~~
~,~~
AfR ~. ~. 2007
~~~a~ -'w~~~~:~ ot~~~i. ~~"..~.
~n~~a- ~~~ ,sYn~?~.vaz°r::~ saa~ach
Re: Laurelmor Development
Stormwater Management Plan
Watauga / Wilkes County, NC
Dear Ms. Lucas:
Please see enclosed items in response to your request for more information per
your letter received by our office March 16, 2007.
The items are as follows:
• 2 sets of revised plans
• 2 copies of the revised Stormwater Management Plan and calculations
which include:
o Revised Stormwater Management Narrative
o Level Spreader Operation and Maintenance Agreement
o Revised Bioretention Worksheets
o Level Spreader Worksheets
o Level Spreader Calculations
o Revised Stormwater Calculations
Please inform our office of any additional information you may need. If you have
any questions concerning this submission you can call me at [phone].
Thank-you,
McGILL ASSOCIATES, P.A.
~' - !~
CHRISTINE BROWN
Engineering Technician
Cc: Mr. Patrick Warren, Ginn
Mr. John Vilas, E'nV Environmental Consulting Services, Inc.
Engineering P l a n n i n g F i n a n c e
McGill Associates, P. A. P.O. Box 1136, Hickory, NC 28603 1236 19th St. Lane NW, Hickory, NC 2860!
828-328-2024 Far:828-328-3870

•
STORMWATER MANAGEMENT PLAN
LAURELMOR CORE AREA
WATAUGA CO., NORTH CAROLINA

DOUGLAS CHAPMAN, P.E.
McGill
A S S O C I A T E S
Engineering • Planning • Finance
Post Office Box 1136
Hickory, North Carolina 28603
January 22, 2007
Revised April 70, 2007
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•

•
LAURELMOR CORE AREA
STORMWATER MANAGEMENT PLAN
NARRATIVE
PROJECT DESCRIPTION
The proposed project consists of golf course, resort area and a surrounding residential
community. This submission is for the Laurelmor Core Area development. This area consists of
a clubhouse, condominiums, outdoor amphitheater underground parking and surface parking
areas. Drainage and erosion control measures will be designed fora 25 yr. storm period. The
total disturbed area is approximately 24.78 acres. For stormwater management, nineteen (19)
bioretention facilities have been designed and strategically located throughout the core area to
catch and treat stormwater runoff from impervious areas. Four of the bioretention areas will also
have level spreaders. The entire project site is located on about 6,100 acres of land in
southeastern Watauga County, North Carolina.
ADJACENT PROPERTY
The majority of land use in the vicinity is rural with some residential areas, but mainly
undeveloped.
• SITE DESCRIPTION
The site is presently wooded and undeveloped. The site consists of ridges and valleys with
named streams on site. These streams drain to Elk Creek, Laurel Creek, or Dugger Creek (a
tributary to Elk Creek). The entire project site lies within an Outstanding Resource Waters
(ORW) area as designated by NC Department of Environment and Natural Resources.
Post-development:
Post-development drainage patterns will remain similar to the pre-development. Stormwater
from impervious areas will be collected and a management facility, bio-retention, will be used to
treat and control discharges.
STORMWATER MANAGEMENT
There are a total of nineteen (19) bioretention facilities proposed for the core area. Throughout
the project, stormwater will be collected by swales or catch basins and piped to the bioretention
areas as storm water management facilities. In several areas, sheet flow will carry stormwater
drainage to the bioretention areas. Where piping is necessary, outlet pipes will discharge to a
level spreader to reduce inlet velocity. Bioretention areas 7, 13, 16 and 19 will have level
spreaders. Where applicable, pipes shall discharge into rip-rap swale areas, which will act as
forebays to pre-treat and dissipate flows. Piped stormwater systems are designed for the 25-year
• storm event. The level spreaders are designed for the 1" storm. Diverter boxes shall be used for
bypass flows. The bioretention facilities are designed to treat the first one inch of rainfall and to
maintain the predevelopment runoff volume using retention storage.

Each bioretention facility is comprised of a planting medium, a mulch layer, plant material, and
an underdrain pipe system. The facility is depressed to allow for a minimal ponding area. The
planting medium is made up of a homogenous soil mix of 85%-88% construction sand; 8%-12%
fines (silt and clay) and 3%-5% organic matter. This medium shall be 3' deep. The mulch layer
shall consist of 3" of hardwood mulch or chips and be at least 6 months old. The plantings shall
be of native varieties, as shown on the plans (such as Inkberry, Wax Myrtle, Common
Witchhazel and Winterberry Holly). Eighteen of the bioretention areas shall have a temporary
ponding depth of 9", while Bio-11 shall have a 12" ponding depth. Underdrain pipes shall be 6"
perforated PVC pipes with end caps, laid in a gravel layer. The underdrain pipes will be
terminated into an outlet control structure (precast concrete catch basin).
The bioretention facility shall be used to remove pollutants from stormwater runoff, by allowing
for filtration and biological activity. The plantings will also provide for an aesthetically pleasing
landscape environment.
STORMWATER MAINTENANCE
The stormwater management facilities shall initially be maintained by the Developer, and
ultimately by the Property Owners Association. (See Operation and Maintenance Agreement.)
The facilities shall be checked and maintained on a regular basis. Repairs and or replacements
• shall be made as deemed necessary to assure proper performance of the bio-retention facilities
and the level spreaders.

•
OPERATION AND MAINTENANCE
AGREEMENTS
•
•

• STORMWATER MANAGEMENT OPERATION AND MAINTENANCE AGREEMENT
LAIJRELMOR CORE AREA - BIORETENTION FACILITIES
WATAUGA CO., NORTH CAROLINA
The stormwater management system is defined as a series of bioretention facilities distributed
throughout the core area site in the Laurelmor-Development. The system re!ie.~ mainly-on sheet flow to
the numerous bioretention facilities. Other collection methods include catch basins, storm drainage
pipes, roof leaders, and grassed swales. Grassed swale areas are used as forebays to aid in mitigation
and pre-treatment of flows entering the bioretention facilities. Manifold pipes are used to disperse flow
entering the facilities directly from storm drainage pipes.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect and repair the bio-retention areas for sediment accumulation, erosion, trash
accumulation, and general condition.
b. Remove mulch from around manifold holes and cleanouts.
2. Remulch any void areas whenever needed. At least once or twice a year add mulch if necessary
(spring and fall). At least once every two years, remove old mulch and completely replace with new.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, underdrains and manifold
pipes etc.) twice a year, to maintain proper functioning.
4. Treat all diseased trees and shrubs when necessary. Remove and replace all dead and diseased
vegetation, (that which is beyond treatment), twice a year. (Replanting shall take place at
appropriate planting times.) Repair or replace planting stakes and support wires as necessary.
5. Water plant material as required for initial planting and for ongoing care.
I acknowledge and agree by my signature below that I am responsible for the performance of the five
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: J Patrick Warren P.E. Ginn-LA Laurel Creek LTD., L_LLP
Title: Vice-President Development
Address: 389 Little Laurel Road Ext. Boone North Carolina 28607
Phone:
Signature:
Date: rLl
•
Page 1 of 2

. 1, ~ Q )/~ ~~ ~ . ~ -~- ,~ ~ , a Notary Public for the State of
(~ Y lZ.l~'~J ~ i ,County of ~ ~~~~~ , do hereby certify that ~
~Qyy}~~q~~-," ~ 1~~~~'2{'~ _ personally appeared before me this ~ day of
F-ZbruG.~- d0 ,and acknowledge the due execution of the forgoing stormwater
management maintenance requirements. Witness my hand and official seal,
WANDA E. 9ENTlEY
Notary Public
North Carolina
Catawba County
SEAL
My commission expires a
•
•
~~
Page 2 of 2

•
LEVEL SPREADER OPERATION AND
MAINTENANCE AGREEMENT
•
•

LEVEL SPREADER SYSTEM OPERATION AND MAINTENANCE AGREEMENT (1/2007)
A level spreader system includes: a forebay, diverter box, level spreader, riparian buffer/vegetated filter strip,
~d flow bypass channel. /~
Name of Project: L-vure-~w~or ~Q.y-~.~O,Jm~.v~ p~.QS~ ~ lo~~r'e.S~,
Address: 3 89 L i f-~l--l ~ La u~e~ ~ c~ o~c~ ~`~'. ~oo~n2. N C ~~ $6 d 7
Maintenance activities shall be performed as follows:
MAINTENANCE ACTIVITY FREQUENCY
Post-construction monitoring-inspect for vegetation, Check after every heavy rainfall for first 6 months
settlin ,erosion, or concentrated flow. followin construction.
Inspect Diverter Box and clean and/or make repairs. Once a month and after heavy rainfalls/storms.
Look for:
• Clogged inlet or outlet pipes.
• Trash/debris in the box.
Inspect Forebay + Level Spreader. Clean and/or Once a month and after heavy rainfalls/storms.
make repairs. Look for:
• Sediment in forebay and along level spreader
lip;
• Trash and/or leaf buildup.
• Scour, undercutting of level spreader.
• Settlement of level spreader structure (no
longer level; you see silt downhill below level
spreader).
• Fallen trees on level spreader.
• #57 stone washin downhill
Inspect the Riparian Buffer and the Bypass Swale Once a month and after heavy rainfalls/storms.
and make repairs as needed'. Look for:
Dama
ed turf reinforcement or ri
ra
rollin .Tr.s ~G.~` ar..d ~r ai are,~~~o''~
~ rQ
(~
g
p
p
g .
downhill. U~S~- ~ i oI'~~r.-~-~~o~''~
• Erosion within the buffer or swale. pQ.~'c~ 'p,~ a~ /~'~0.~^'~'~^o--~C1;..
U
• Concentrated flows downhill of level ~
~~~Q,,,.~-~-
s reader-look for ullies or sediment flows.
Mow grass to a 6" height. As needed during growing season.
Remove any weeds/shrubs growing on level spreader Once a year.
or in swale.

1 NOTE: Contact NC Division of Water Quality, 401/Wetlands Unit at 919-733-1786 BEFORE any work
in Protected Riparian Buffers.
Page 1 of 2

LEVEL
SPREADER NO. LOCATION ON SITE (DESCRIBE) HOW WILL IT BE ACCESSED?
~Ji o -`"? ~S p,-ir 6 i o- -7 in~ds~ A~e~. C~.o Park.t l~>reo,.
2 k~to -l'~ L,5 p,-F ~i o -13 ~o,.c~a (~rec~ C o•~o r'o~r~ t'~-,r~o~
3 ~ i O ` (~o l._S A~.. (~ i o - (~C C ~v~D ~ ~J S ~. Go ~ ~ `, 0.~` 1"Q~t'1
4 ~i o -1 q 1-s ~~ Q~ a • I ~ ~.o~o l~r~x~ G d 1 ~ C.Qr-~I-- I~oi.~"~
5
6

I acknowledge and agree by my signature below that I am responsible for the performance of the 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
Title:
Addr
Phor
Sign<
ate. • ~.~ .. ,, - -
'`C~ . ~?`'~~
i~
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 ~, .gQ~1~1`~~-Q.,yl , a Notary Public for the State of ~gY~t ~,(,1.~0~1/1G~.,
County of ~~~ t,U ~,~ , do hereby certify that ~~(~~~ i ~ ~. ~(~ Y Y-~-~'`--
personally appeared before me this ~~ day of ~~~i ( 2D0`~ ,and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
WANCA E. lENttEY
Notary Pubfic
North Carolina
Catawba County
SEAL
My commission expires ~ ~ ~ ~ o? ~
Page 2 of 2

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REVISED BIORETENTION AREA
WORKSHEETS

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• DWQ Project
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
p~
Project Name : LQ u,.r2 v-~o!' (rev 2.~ o ~
p r+12r,~' T Y10.S e ~ Ore /'~feq
Contact Person: ta'L.r~$ row•-~ Phone Number: 13}3'1 3Z~f- aoa
For projects with multiple basins, specify which ba
si
n this worksheet applies to: ~ i o - 1
Permanent Pool Elevation ~~
``
~3(0'1.O0 ft. (elevation of the orifice invert out)
Temporary Pool Elevation a 3 ~4•-7S ft. (elevation of the outlet structure invert in)
Bioretention Surface Area 3, ~~ 7 sq. ft.
Drainage Area ~• SR ac. (on-site and off-site drainage to the basin)
Impervious Area . (n~e ac. (on-site and off-site drainage to the basin)
Rational C Coefficient . (e
Size % "7 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity i . ~ ~. fps
Inlet flow depth 5~.0 in
Depth to Ground Water 71-~ ft.
Planting Soil Infiltration Rate "~• in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Applicants Initials
C(3 No vertical sand bed is proposed
C.13 The bioretention area is at least 40 feet by 15 feet.
uS Sheet flow is provided at inlet.
(~ Water table depth is greater than 6 feet.
Gf3 Minimum of 6" ponding is provided.
~ The ponded area will draw down in less than 4 days.
~ 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.
G~-Mulch layer is specified in plans.
G'~ Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
~_1(S Plan details for the bioretention area provided.
C+~i Plan details for the inlet and outlet are provided.
C >a 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.
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information): 1.
Project Name : L-c~.~ ~ ~ r ~ 1 2 ( ar'~ ~
Contact Person: ~~.. r. c 1 r'~o ~r.-/~ Phone Number: ($a.~1 3 ~..$- ~0~.4
For projects with multiple basins, specify which basin this worksheet applies to: Q i o - 1
Permanent Pool Elevation ~~~o •OO ft. (elevation of the orifice invert out)
Temporary Pool Elevation '~ 3(uy."?$ ft, (elevation of the outlet structure invert in)
Bioretention Surface Area O sq. ft.
Drainage Area . 89 ac. (on-site and off-site drainage to the basin)
Impervious Area . 3 (n ac. (on-site and off-site drainage to the basin)
Rational C Coefficient . (o
Size % ~ % (either 5% in w/sand under drain or 7% in wlo)
Inlet Velocity . ~ $ fps
Inletflowdepth $.1(v in
Depth to Ground Water 71 ~ ft.
Planting Soil Infiltration Rate ~ in./hr. (the soil-layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ in.ihr. (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.
Applicants Initials
C..4 No vertical sand bed is proposed
GO The bioretention area is at least 40 feet by 15 feet.
c,13 Sheet flow is provided at inlet.
G13 Water table depth is greater than 6 feet.
C1~ Minimum of 6" ponding is provided.
r,:~ The ponded area will draw down in less than 4 days.
r.=.NS Planting soil infiltration rate is greater than 0.52 in/hr.
CJS The in-situ soil infiltration rate is greater than 0.2 in/hr.
UO A planting plan with species and densities is provided.
C:~ Mulch layer is specified in plans.
GES Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
c~Plan details for the bioretention area provided.
C.rS Plan details for the inlet and outlet are provided.
U3 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.
DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information): F
Pro ect Name : ~ ,-~1 0 ~ ~ '''''~-
Contact Person: G1n r ~ s ~o~ ,~ ~ __ Phone Number: (S~)_~ ~ 8' - ~ O ~ i
For projects with multiple basins; specify which trasin th is worksheet applies to: ~ e r~ -~
0 elevation of the orifice invert out)
Permanent Pool Elevation a~J~ ~ ~ ft• (
Temporary Pool Elevation ~ 3 78~ a 5 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area ~ f 2.l 3 _- sq. ft.
Drainage Area : $~~_ ac• (on-site and off-site drainage to the basin)
>: ac. (on-site and off-site drainage to the basin)
Impervious Area ~+
Rational C Coefficient
Size % ~ % (either 5% in wJsand under drain or 7% in w/o)
Inlet Velocity __~ fps
Inlet flow depth ~O in
Depth to Ground Water 7-1 ~ ft•
Planting Soil Infiltration Rate 2, in.lhr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ in.lhr. (the soil layer below 4 feet or below the sand bed)
II. REQUIRED fTEMS 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 stonnwater 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.
No vertical sand bed is proposed
G The bioretention area is at least 40 feet by 15 feet.
G Sheet flow is provided at inlet.
(~,i3 Water table depth is greater than 6 feet.
G6 Minimum of 6' ponding is provided. ,
G~3 The ponded area will draw down in less than 4 days.
~t6 Planting soil infiltration rate is greater than 0.52 irUhr.
G(j The in-situ soil infiltration rate is greater than 0.2 in/hr.
_ L+~ A planting plan with species and densities is provided.
G{~ Mulch layer is specified in plans.
GC's Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management
Practices Manual, April 1999)
U(j Plan details for the bioretention area provided.
l ~ Plan details for the inlet and outlet are provided.
G O 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
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : ~, ~ lw.s~ m ~ P I r
Contact Person: _~~~, f-; ~ rown Phone Number: I Y28) 3 "1~ ~ ~.
For projects with multiple basins, specify which basin this worksheet applies to: f3 i o - ~
Permanent Pool Elevation a~S 3C7. 6O ft. (elevation of the orifice invert out)
Temporary Pool Elevation at 330. ?~.~ ft. (elevation of the outlet structure invert in)
Bioretention Surface Area o~? sq. ft.
Drainage Area ac.
Impervious Area . '~ O ac.
Rational C Coefficient . (o
Size % ?
Inlet Velocity .7 ~ fps
Inlet flow depth ~, Z$ in
Depth to Ground Water ? t ~ ft.
Planting Soil Infiltration Rate '~. in./hr.
In-Situ Soil Infiltration Rate 1 in./hr.
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(either 5% in w/sand under drain or 7% in wlo)
(the soil layer down to 4 feet)
(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. tf 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.
Applicants Initials
~JfS No vertical sand bed is proposed
C,rS The bioretention area is at least 40 feet by 15 feet.
C.N Sheet flow is provided at inlet.
rJ3 Water table depth is greater than 6 feet.
CJ? Minimum of 6" ponding is provided.
C.-3 The ponded area will draw down in less than 4 days.
C.4S Planting soil infiltration rate is greater than 0.52 in/hr.
clJ The in-situ soil infiltration rate is greater than 0.2 in/hr.
CJ~S A planting plan with species and densities is provided.
GS Mulch layer is specified in plans.
CC'S Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
a Plan details for the bioretention area provided.
Plan details for the inlet and outlet are provided.
CJ3 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
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name: La~I'1~1n.dr ~eve~oO~rn t.'~' ~ s ~ ~~'@. ~re0.
Contact Person: (~ lnri c rb w r~ Phone Number: (5f~d1 '31~$' - ~ O a
For projects with multiple basins, specify which basin this worksheet applies to: __.~; tl - 5
Permanent Pool Elevation 6 O ft. (elevation of the orifice invert out)
Temporary Pool Elevation 7 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area a. S S~ sq. ft.
Drainage Area _ $'y ac. (on-site and off-site drainage to the basin)
Impervious Area . '1 Z. ac. (on-site and off-site drainage to the basin)
Rational C Coefficient (p
Size % 7 % (either 5% in w/sand under drain or 7% in wlo)
Inlet Velocity L, 9 Z fps
-
Inlet flow depth ~ ~~
in
Depth to Ground Water "> 1 ~- ft.
Planting Soil Infiltration Rate __~y in./hr. (the soil-layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Applicants Initials
C-(3 No vertical sand bed is proposed
G(5 The bioretention area is at least 40 feet by 15 feet.
c.1:5 Sheet flow is provided at inlet.
LIS Water table depth is greater than 6 feet.
c_.ftS Minimum of 6" ponding is provided.
_~.I~_The ponded area will draw down in less than 4 days.
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.
C16 Mulch layer is specified in plans.
C1r~ Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
_ G~ 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.
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
1. PROJECT INFORMATION (please complete the following information): t
Project Name : ~ rh ^~
Contact Person: ~..~ri c Phone Number: (~ 81 3 ~],.~
For projects with multiple basins, specify which basin this worksheet applies to: ~j Pc~ - (e
Permanent Pool Elevation a 35 3.00 ft. (elevation of the orifice invert out)
Temporary Pool Elevation a~ S 3. 7 $ ft. (elevation of the outlet structure invert in)
Bioretention Surface Area I _ b9 ~ sq. ft.
Drainage Area I ~ 5 ~ ac. (on-site and off-site drainage to the basin)
Impervious Area . 9 O ac. (on-site and off-site drainage to the basin)
Rational C Coefficient . In
Size % -7 % (either 5% in w/sand under drain or 7% in wlo)
Inlet Velocity (~ d ~ fps
Inlet flow depth (o."~ in
Depth to Ground Water 7 I ~-. ft.
Planting Soil Infiltration Rate ~. in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Applicants Initials
C;(S No vertical sand bed is proposed
_ C.14 The bioretention area is at least 40 feet by 15 feet.
Sheet flow is provided at inlet.
G!3 Water table depth is greater than 6 feet.
~ Minimum of 6" ponding is provided.
The ponded area will draw down in less than 4 days.
Planting soil infiltration rate is greater than 0.52 in/hr.
The in-situ soil infiltration rate is greater than 0.2 in/hr.
C13 A planting plan with species and densities is provided.
_~,~Mulch layer is specified in plans.
C~ Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management
Practices Manual, April 1999)
C1CS Plan details for the bioretention area provided.
G.YS 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
DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : ~ y o ~ ~ fir
Contact Person: C I~n•5 fbw.-~ Phone Number: (rC~ 31A - ~o a~_/
For projects with multiple basins, specify which basin this worksheet applies to: b i cs - ~
Permanent Pool Elevation '~ 3 Szj. 00 ft. (elevation of the orifice invert out)
Temporary Pool Elevation "~ 3 S 3.'Z S ft. (elevation of the outlet structure invert in}
Bioretention Surface Area ~ ~ I y ~ sq. ft.
Drainage Area (. ~-f 1 ac. (on-site and off-site drainage to the basin)
Impervious Area ~(Q q ac. (on-site and off-site drainage to the basin)
Rational C Coefficient _ I;o
Size % `'7 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity .3~o fps
Inlet flow depth . 5~ in
Depth to Ground Water 7 1 ~ ft.
Planting Soil Infiltration Rate ~ in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Applicants Initials
U[S No vertical sand bed is proposed
G16 The bioretention area is at least 40 feet by 15 feet.
Sheet flow is provided at inlet.
Water table depth is greater than 6 feet.
GYM Minimum of 6" ponding is provided.
LAS The ponded area will draw down in less than 4 days.
V'S Planting soil infiltration rate is greater than 0.52 in/hr.
~',~Y~_The in-situ soil infiltration rate is greater than 0.2 in/hr.
~ A planting plan with species and densities is provided,
C.YS Mulch layer is specified in plans.
C15 Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
Plan details for the bioretention area provided.
Plan details for the inlet antl 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.
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (ple se complete the following information):
Project Name : ~..(iu~rr~r' Q -,,Q_I'd ,or-~~-.-~` ~h a3 e I ~~l
Contact Person: C~-.r i S f ac..~ ~ Phone Number: (~~.~f 3-1~
For projects with multiple basins, specify which basin this worksheet applies to: d i o ~
Permanent Pool Elevation ~ 3 tb?. Sd ft. (elevation of the orifice invert out)
Temporary Pool Elevation '~3 ~c8. ~S ft. (elevation of the outlet structure invert in)
Bioretention Surface Area _~~ N 1 ~ sq. ft.
Drainage Area I.90 ac. (on-site and off-site drainage to the basin)
Impervious Area 1. I "'~ ac. (on-site and off-site drainage to the basin)
Rational C Coefficient , ')
Size % "7 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity fps
Inlet flow depth . a in
Depth to Ground Water 7 t •~ ft.
Planting Soil Infiltration Rate ~ in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate 1 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.
Applicants Initials
~ No vertical sand bed is proposed
GIB The bioretention area is at least 40 feet by 15 feet.
L~ Sheet flow is provided at inlet.
(:JS Water table depth is greater than 6 feet.
Cx1 Minimum of 6" ponding is provided.
C~ The ponded area will draw down in less than 4 days.
C!~ Planting soil infiltration rate is greater than 0.52 in/hr.
~ The in-situ soil infiltration rate is greater than 0.2 inlhr.
CIS A planting plan with species and densities is provided.
G15 Mulch layer is specified in plans.
!^~ Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
CY5 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 parry is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains
•

• DWQ Project No
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : l-0.c.~r 2 r~nor' 2.v~ aDw~.Cr'~ !- wr' 0.
Contact Person: _f~hr-i 5 r'owr~ Phone Number: (881 3 ~$' ~o~~
For projects with multiple basins, specify which basin this worksheet applies to: b i o .. 9
Permanent Pool Elevation o~3~ $ 00 ft. (elevation of the orifice invert out)
Temporary Pool Elevation ~ 3 `-F g. ~7 S ft. (elevation of the outlet structure invert in)
Bioretention Surface Area _ ~. O (~ sq. ft.
Drainage Area . -2 ~ ac. (on-site and off-site drainage to the basin)
Impervious Area . ~! 3 ac. (on-site and off-site drainage to the basin)
Rational C Coefficient . (o
Size % ~ % (either 5% in w/sand under drain or 7% in wlo)
Inlet Velocity I.0 B' fps
Inlet flow depth t - 3Z in
Depth to Ground Water > IZ ft.
Planting Soil Infiltration Rate 'a in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Aoolicants Initials
C.X'~ No vertical sand bed is proposed
G3 The bioretention area is at least 40 feet by 15 feet.
_S'/~ Sheet flow is provided at inlet.
~ Water table depth is greater than 6 feet.
GVS Minimum of 6" ponding is provided.
The ponded area will draw down in less than 4 days.
Planting soil infiltration rate is greater than 0.52 in/hr.
CY3 The in-situ soil infiltration rate is greater than 0.2 inihr.
dS A planting plan with species and densities is provided.
C~ Mulch layer is specified in plans.
t~ Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management
Practices Manual, April 1999)
C~ Plan details for the bioretention area provided.
C~ Plan details for the inlet and outlet are provided.
r~ 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
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following informati n):
Project Name : a.ure ~vro,r' ve M2r. a. C ~~a
Contact Person: G1~rC c ~ [b ~,vr-~ Phone Number: (~~} 3Z B'-'3.0 '7~.y
For projects with multiple basins, specify which basin this worksheet applies to: fIJ i V - 1 O
Permanent Pool Elevation ~33~ . 6 O ft. (elevation of the orifice invert out)
Temporary Pool Elevation a. 33'1.''?5 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area ,5~ 0 a~ sq. ft.
Drainage Area . X18 ac. (on-site and off-site drainage to the basin)
Impervious Area , ~ ~. ac. (on-site and off-site drainage to the basin)
Rational C Coefficient . (o
Size % 7 % (either 5% in w/sand under drain or 7% in wlo)
Inlet Velocity 1. $ ~ fps
Inletflowdepth a.4o in
Depth to Ground Water ? ~ ~- ft.
Planting Soil Infiltration Rate '~ in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Applicants Initials
[~ No vertical sand bed is proposed
[ 1S The bioretention area is at least 40 feet by 15 feet.
c_>d Sheet flow is provided at inlet.
cyS Water table depth is greater than 6 feet.
CAS Minimum of 6" ponding is provided.
CYS The ponded area will draw down in less than 4 days.
C_YS Planting soil infiltration rate is greater than 0.52 in/hr.
G1S The in-situ soil infiltration rate is greater than 0.2 in/hr.
C~ A planting plan with species and densities is provided.
Mulch layer is specified in plans.
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
CJ'S 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
DIVI51ON OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : LQ.u.y~el•rw/' ~.v ~~oPJ M 1" I~QSe..I ~t"
Contact Person: ~~~ s 13,r-ow-~-t Phone Number: ~TQ 3~ $- a1~
For projects with multiple basins, specify which basin this worksheet applies to: Q C a• 1 ~
Permanent Pool Elevation ~3~{5. 00 ft. (elevation of the orifice invert out)
Temporary Pool Elevation Z 3 ~(~o .d d ft, (elevation of the outlet structure invert in)
Bioretention Surface Area /O~ ~~3 sq. ft.
Drainage Area _~ . 7~o ac. (on-site and off-site drainage to the basin)
Impervious Area I . ~! ~ ac. (on-site and off-site drainage to the basin)
Rational C Coefficient X
Size % _7 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity l . ~ ~ fps
Inlet flow depth (o .q'(o in
Depth to Ground Water 7 t "]~-. ft.
Planting Soil Infiltration Rate _ ~ in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Applicants Initials
CAS No vertical sand bed is proposed
C~(3 The bioretention area is at least 40 feet by 15 feet,
r~S Sheet flow is provided at inlet.
c~S Water table depth is greater than 6 feet.
GS Minimum of 6" ponding is provided.
CAS The ponded area will draw down in less than 4 days.
CXS Planting soil infiltration rate is greater than 0.52 in/hr.
Glr3 The in-situ soil infiltration rate is greater than 0.2 in/hr.
Ub A planting plan with species and densities is provided.
_~~Mulch layer is specified in plans.
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
~ 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
DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete a following information):
Project Name : `vr~rJr Q
Contact Person: _f ,~r-- S ~~-ow/~ Phone Number: fY~.81 3'a.. ~" ~0 ~
For projects with multiple basins, specify which basin this worksheet applies to: ~ ~ c~ - 12
Permanent Pool Elevation era ~ I . G 0 ft. (elevation of the orifice invert out)
Temporary Pool Elevation '~'~ ~ (. 'Z .5 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area ~ ~ I I O sq. ft.
Drainage Area (. Z.Z. ac. (on-site and off-site drainage to the basin)
Impervious Area ~ ac. (on-site and off-site drainage to the basin)
Rational C Coefficient
Size % '7 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity - [, S O fps
Inlet flow depth ~•f. Sto in
Depth to Ground Water 7 t ~ ft.
Planting Soil Infiltration Rate ~ in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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 proposed
C_Y3 The bioretention area is at least 40 feet by 15 feet.
C.13 Sheet flow is provided at inlet.
C13 Water table depth is greater than 6 feet.
C' H Minimum of 6" ponding is provided.
c~ The ponded area will draw down in less than 4 days.
CYS Planting soil infiltration rate is greater than 0.52 in/hr.
C,lrj _The in-situ soil infiltration rate is greater than 0.2 in/hr.
G15 A planting plan with species and densities is.provided.
U'S Mulch layer is specified in plans.
CJ'S Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
C.fS Plan details for the bioretention area provided.
GC3 Plan details for the inlet and outlet are provided.
G!3 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
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
1. PROJECT INFORMATION (please complete tti following information):
Project Name : L 0.c~rE,wva'r v C.. ~ 6 {~ G.
Contact Person: r' Phone Number: ~, ~ (} ~
For projects with multiple basins, specify which basin this worksheet applies to:
Permanent Pool Elevation ~ ~ ~ ft. (elevation of the orifice invert out)
Temporary Pool Elevation 7 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area S sq. ft.
Drainage Area I. ~`~ ac. (on-site and off-site drainage to the basin)
Impervious Area 55 ac. (on-site and off-site drainage to the basin)
Rational C Coefficient , ~
Size % --7 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity . 3 ~ fps
Inlet flow depth „ $~$ in
Depth to Ground Water ~ f ~-. ft.
Planting Soil Infiltration Rate ~ in./hr. (the soil-layer down to 4 feet)
In-Situ Soil Infiltration Rate I 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 mef, 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.
Applicants Initials
C.yS No vertical sand bed is proposed
Gd The bioretention area is at least 40 feet by 15 feet.
tXl Sheet flow is provided at inlet.
t:J3 Water table depth is greater than 6 feet.
_ U? Minimum of 6" ponding is provided.
r}~_The ponded area will draw down in less than 4 days.
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,
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
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.
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : ~- re-~ o ~ ~ ~'''~
Contact Person: C,1~, r? s r-oty n _ Phone Number: (~~~~1 '3 ~ 8' - ~ c
For projects with multiple basins, specify which basin this worksheet applies to: __.~ _~~ - I `-{
Permanent Pool Elevation c O ft. (elevation of the orifice invert out)
Temporary Pool Elevation '~'~9 C.T~? ft. (elevation of the outlet structure invert in)
Bioretention Surface Area
Drainage Area
Impervious Area
°~t1C.,C~ ~ CCeffiCie~t
SIZe
~ a3__ sq. ft.
a ~', -, ac.
ao ac.
~~
-]
(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 wlo)
Inlet Velocity
Inlet flow depth
Depth to Ground Water
Planting Soil Infiltration Rate
In-Situ Soil Infiltration Rate
II. REQUIRED ITEMS CHECKLIST
{,b~ fps
oK in
> i a ft.
1, in.mr
in./hr
(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 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.
_~ No vertical sand bed is proposed
G~The bioretention area is at least 40 feet by 15 feet.
G Sheet flow is provided at inlet.
(',L3 Water table depth is greater than 6 feet.
~ Minimum of 6' ponding is provided. ,
GB The ponded area will draw down in less than 4 days.
gib Planting soil infiltration rate is greater than 0.52 in/hr.
G(3 The in-situ soil infiltration rate is greater than 0.2 inmr.
c; ~_--A planting plan with species and densities is provided.
G{~ Mulch layer is specified in plans.
GCIi Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management
Practices Manual, April 1999)
G(3 Plan details #or the bioretention area provided.
~', Plan details for the inlet and outlet are provided.
G D 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
I~

DWQ Project No.
DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information): F
Project Name : cl r~~ o L) ~ ~''^
' -- Phone Number: (~3'25~`1 ~ ~ R" - ~ O ~~
o .~ ~
1r, r i c r
Contact Person:
For projects with multiple basins, specify which basin this worksheet applies to: _~ i c-~ - I '~
Permanent Pool Elevation a 3 9 ~ ,~ ~ ft• (elevation of the orifice invert out)
Temporary Pool Elevation '~'3 9 „ '"~ 5 ft• (elevation of the outlet structure invert in)
Bioretention Surface Area "~O sq. ft.
~ ac
(on-site and off-site drainage to the basin)
Drainage Area
Impervious Area .
~
,fi
tt ac. (on-site and off-site drainage to the basin)
nauv~~a~ ~ u~c,~~~.....
Size % ,
-7 %
(either 5% in wlsand under drain or 7% in wlo)
Inlet Velocity ~• ~O fps
~ ~~- in
Inlet flow depth
Depth to Ground Water
Planting Soil Infiltration Rate 7 1 a ft.
2, in./hr.
(the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate I 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 fulty 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.
_ No vertical sand bed is proposed
G The bioretention area is at least 40 feet by 15 feet.
G3- Sheet flow is provided at inlet.
(~,>3 Water table depth is greater than 6 feet.
G'6 Minimum of 6" ponding is provided. ,
Gb The ponded area will draw down in less than 4 days.
G. 6 Planting soil infiltration rate is greater than 0.52 in/hr.
G(3 The in-situ soil infiltration rate is greater than 0.2 in/hr.
c, ~ A planting plan with species and densities is provided.
Gb Mulch layer is specified in plans.
GCS Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management
Practices Manual, April 1999)
G(3 Plan details for the bioretention area provided.
t3 Plan details for the inlet and outlet are provided.
G fl An operation and maintenance agreement signed and notarized by the responsible parry is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

• DWQ Project No
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete
Project Name : ~ ~_
Contact Person;
For projects with multiple basins, specify which basi
Permanent Pool Elevation ~3 ~~.00 ft. (elevation of the orifice invert out)
Temporary Pool Elevation a 3$a .7 S ft. (elevation of the outlet structure invert in)
Bioretention Surface Area 7, 0 ~3' 3 sq. ft.
Drainage Area a . I (Z_ ac. (on-site and off-site drainage to the basin)
Impervious Area , $'~o ac. (on-site and off-site drainage to the basin)
Rational C Coefficient , (o
Size % '7 % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity I ~ 1 ~- fps
Inlet flow depth . 5 0 in
Depth to Ground Water 7 I ~ fl,
Planting Soil Infiltration Rate ~, in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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 proposed
G~ The bioretention area is at least 40 feet by 15 feet.
C;1~ Sheet flow is provided at inlet.
Water table depth is greater than 6 feet.
Minimum of 6" ponding is provided.
The ponded area will draw down in less than 4 days.
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.
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
(~_Plan details for the bioretention area provided.
_~.l? Plan details for the inlet and outlet are provided.
C:~-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
DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : L•. w+ [' o rr.~r~ qS ~ O/'
Contact Person; __~' ~r` i s rd~,~ Phone Number: ($~8)
For projects with multiple basins, specify which basin this worksheet applies to: t3 i O ~ 1;3~Zg ^7.0
Permanent Pool Elevation ~~~9 ~ O~ ft. (elevation of the orifice invert out)
Temporary Pool Elevation '~"~~i~-I,7 S ft. (elevation of the outlet structure invert in)
Bioretention Surface Area (~ lQ 17 sq. ft.
Drainage Area . (o $' ac. (on-site and off-site drainage to the basin)
Impervious Area .) (o ac. (on-site and off-site drainage to the basin)
Rational C Coefficient , y
Size % "7 % (either 5% in w/sand under drain or 7% in w/o}
Inlet Velocity x.80 fps
Inlet flow depth , ~~{ in
Depth to Ground Water 71"1. ft.
Planting Soil Infiltration Rate '1 in./hr. (the soil-layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
Applicants Initials
[~ No vertical sand bed is proposed
C.13 The bioretention area is at least 40 feet by 15 feet.
_L~_Sheet flow is provided at inlet.
r.Y1 Water table depth is greater than 6 feet,
~,~_Minimum of 6" ponding is provided.
['~_The ponded area will draw down in less than 4 days.
l J3 Planting soil infiltration rate is greater than 0.52 in/hr.
fyS The in-situ soil infiltration rate is greater than 0.2 in/hr.
CX3 A planting plan with species and densities is.provided.
Mulch layer is specified in plans,
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
(~ Plan details for the bioretention area provided.
r.I~ Plan details for the inlet and outlet are provided.
_~,1'~_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
r~
L J

• DWQ Project No
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete t following information):
Project Name : ~ ~ ,r ~.
Contact Person: ~ Phone Number: F1i. t
For projects with multiple basins, specify which basin this worksheet applies to: did - 1
Permanent Pool Elevation a37~ •QO ft. (elevation of the orifice invert out)
Temporary Pool Elevation ~'~~7]~.. 7 5 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area o~~87-Z- sq. ft.
Drainage Area 1.'73 ac. (on-site and off-site drainage to the basin)
Impervious Area ac, (on-site and off-site drainage to the basin)
Rational C Coefficient
Size % '7 % (either 5% in w/sand under drain or 7% in wlo)
Inlet Velocity . 3 g fps
Inlet flow depth . 5$ in
Depth to Ground Water ? ~ "~-- ft.
Planting Soil Infiltration Rate ~. in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~ 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.
[.Ci No vertical sand bed is proposed
C.-3 The bioretention area is at least 40 feet by 15 feet.
~- Sheet flow is provided at inlet.
C.13 Water table depth is greater than 6 feet.
C.13 Minimum of 6" ponding is provided.
C.13 The ponded area will draw down in less than 4 days.
~~ Planting soil infiltration rate is greater than 0.52 in/hr.
Gl3 The in-situ soil infiltration rate is greater than 0.2 in/hr.
cY3 A planting plan with species and densities is provided.
Mulch layer is specified in plans.
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
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
•

•
LEVEL SPREADER WORKSHEETS

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : Laurelmor Develo pment Phase 1 Core Area
Contact Person: Chris Brown Phone Number: [phone]
Level Spreader ID: Bio-7 LS
Level Spreader Length 36 ft. (perpendicular to flow)
Drainage Area .77 ac. (on-site and off-site drainage to the level spreader)
Impervious Area .56 ac. (on-site and off-site drainage to the level spreader)
Forebay Area 49 cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 0 % (6% for forested/leaf littler cover, 8% for grass/thick cover)

Max. Discharge from 1 "/Hr Storm .53 cfs
Max. Discharge to Level Spreader .53 cfs (Discharge rate from extended detention wetland or pond)
Filter Stripl Zone 1 Buffer Vegetatio Bioretention (Grass/Thick ground cover or Forested)
Filter Stripl Zone 1 Buffer Width 66 ft.
Filter Stripl Zone 2 Buffer Vegetation NIA ft.
Filter Stripl Zone 2 Buffer Width NIA ft.

Bypass Method Used Diverter Box Please include a worksheet for this.
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, please explain 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
subm-ttal package wrll result -n a request for additional information and will substantially delay final review and approval of
the project.
Aoolicants Initials
CB Project Site was visited prior to designing level spreader system.
NIA Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
CB Level spreader length is at least: 13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
CB All ground cover types and their widths have been labeled on the construction plans.
CB All contours have been depicted on the construction. plans.
CB No structures are located in protected buffers (must meet no practical alternatives criteria).
CB No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
CB Construction details for the level spreader have been provided.
CB The operation and maintenance agreement signed and notarized by the responsible party is provided.
NIA No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
CB Bypass conveyance method is specified and construction details and calculations are provided.
NIA Alternative design option is specified and plan details and calculations are provided.
• CB Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
CB Construction details for the bypass and outlets are provided.

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
• I. PROJECT INFORMATION (please complete the following information):
Project Name : Laurelmor Develo pment Phase 1 Core Area
Contact Person: Chris Brown Phone Number: j 828) 328-2024
Level Spreader ID: Bio-13 LS
Level Spreader Length 50 ft. (perpendicular to flow)
Drainage Area 1.10 ac. (on-site and off-site drainage to the level spreader)
Impervious Area .17 ac. (on-site and off-site drainage to the level spreader)
Forebay Area 15 cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 0 % (6% for forested/leaf littler cover, 8% for grass/thick cover)

Max. Discharge from 1 "/Hr Storm .77 cfs
Max. Discharge to Level Spreader .77 cfs (Discharge rate from extended detention wetland or pond)
Filter Stripl Zone 1 Buffer Vegetation Bioretention (Grass/Thick ground cover or Forested)
Filter Strip/ Zone 1 Buffer Width 64 ft.
Filter Stripl Zone 2 Buffer Vegetation NIA ft.
Filter Stripl Zone 2 Buffer Width NIA ft.
Bypass Method Used Diverter Box Please include a worksheet for this.
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, please explain 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 requesf for additional information and will substantially delay final review and approval of
the project.
Applicants Initials
CB Project Site was visited prior to designing level spreader system.
NIA Date of the Site visit. Please attach time•dated digital photos of existing buffer conditions.
CB Level spreader length is at least: 13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the bufferlfilter strip).
CB All ground cover types and their widths have been labeled on the construction plans.
CB All contours have been depicted on the construction plans.
CB No structures are located in protected buffers (must meet no practical altematives criteria).
CB No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
CB Construction details for the level spreader have been provided.
CB The operation and maintenance agreement signed and notarized by the responsible party is provided.
NIA No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
CB Bypass conveyance method is specified and construction details and calculations are provided.
NIA Alternative design option is specified and plan details and calculations are provided.
• CB Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
CB Construction details for the bypass and outlets are provided.

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : Laurelmor Develo pment Phase 1 Core Area
Contact Person: Chris Brown Phone Number: [phone]
Level Spreader ID: Bio-16 LS
Level Spreader Length 38 ft. (perpendicular to flow)
Drainage Area .65 ac. (on-site and off-site drainage to the level spreader)
Impervious Area .19 ac. (on-site and off-site drainage to the level spreader)
Forebay Area 17 cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 0 % (6% for forested/leaf littler cover, 8% for grass/thick cover)

Max. Discharge from 1 "/Hr Storm .59 cfs
Max. Discharge to Level Spreader .59 cfs (Discharge rate from extended detention wetland or pond)
Filter Stripl Zone 1 Buffer Vegetation Bioretention (Grass/Thick ground cover or Forested)
Filter Strip/ Zone 1 Buffer Width 60 ft.
Filter Stripl Zone 2 Buffer Vegetation NIA ft.
Filter Stripl Zone 2 Buffer Width NIA ft.

Bypass Method Used Diverter Box Please include a worksheet for this.
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, please explain 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
submiftal package will result in a request for additional information and will substantially delay final review and approval of
the project.
Aoolicants Initials
CB Project Site was visited prior to designing level spreader system.
N/A Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
CB Level spreader length is at least:13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
foot canopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
CB All ground cover types and their widths have been labeled on the construction plans.
CB All contours have been depicted on the construction plans.
CB No structures are located in protected buffers (must meet no practical alternatives criteria).
CB No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
CB Construction details for the level spreader have been provided.
CB The operation and maintenance agreement signed and notarized by the responsible party is provided.
NIA No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
CB Bypass conveyance method is specified and construction details and calculations are provided.
NIA Alternative design option is specified and plan details and calculations are provided.
. CB Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
CB Construction details for the bypass and outlets are provided.

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
• I. PROJECT INFORMATION (please complete the following information):
Project Name : Laurelmor Develo pment Phase 1 Core Area
Contact Person: Chris Brown Phone Number: X828) 328-2024
Level Spreader ID: Bio-19 LS
Level Spreader Length 48 ft. (perpendicular to flow)
Drainage Area .91 ac. (on-site and off-site drainage to the level spreader)
Impervious Area .56 ac. (on-site and off-site drainage to the level spreader)
Forebay Area 49 cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 0 % (6% for forested/leaf littler cover, 8% for grass/thick cover)

Max. Discharge from 1 "/Hr Storm .73 cfs
Max. Discharge to Level Spreader .73 cfs (Discharge rate from extended detention wetland or pond)
Filter Strip/ Zone 1 Buffer Vegetation Bioretention (Grass/Thick ground cover or Forested)
Filter Strip/ Zone 1 Buffer Width 53 ft.
Filter Stripl Zone 2 Buffer Vegetation NIA ft.
Filter Strip/ Zone 2 Buffer Width NIA ft.
Bypass Method Used Diverter Box Please include a worksheet for this.
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, please explain 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.
Applicants Initials
CB Project Site was visited prior to designing level spreader system.
NIA Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
CB Level spreader length is at least: 13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
CB All ground cover types and their widths have been labeled on the construction plans.
CB All contours have been depicted on the construction plans.
CB No structures are located in protected buffers (must meet no practical alternatives criteria).
CB No draws are located in the buffer or filter step in the vicinity of the proposed level spreader.
CB Construction details for the level spreader have been provided.
CB The operation and maintenance agreement signed and notarized by the responsible party is provided.
NIA No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
CB Bypass conveyance method is specified and construction details and calculations are provided.
NIA
Alternative design option is specified and plan details and calculations are provided.
• CB Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
CB Construction details for the bypass and outlets are provided.

•
LEVEL SPREADER DESIGN CALCULATI®NS
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