20001048 Ver 2_Stormwater Info_20091208

NJ Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
8262 Market St. - Suite 201 • Wilmington, NC 28411
December 8, 2009
I?
Ms. Cyndi Karoly A ID
Supervisor
NCDENR-DWQ 401 Oversight/Express Review Program
2321 Crabtree Blvd. Suite 250
Raleigh, NC 27604
RE: Lanesboro Correctional Institute formally known as Anson County Correctional Facility
DWQ Project Number 00-1048v2
Stormwater Permit Modification Express Submittal
Dear Ms. Karoly:
This modification is to the existing stormwater permit approved on June 28, 2001. The purpose of this
modification is to design and build an additional building to the already constructed Lanesboro
Correctional Institute.
The new structure will be located on the northern end of the current prison and will disturb approximately
2 acres of the 177 acre site. There are three stormwater ponds already constructed on the site that control
the runoff from the site. The new building has been designed to collect the stormwater runoff and
discharge it into Ponds 1 and 2 on site. Pond 3 will remain unchanged for this project and will collect no
additional runoff.
In order for this project to be accepted into the Express Review Program there were a number of items
required that are included in this submittal:
a. The application fee of $1,000 made payable to the North Carolina Division of Water Quality.
b. Two (2) complete and collated copies of the Express Review Stormwater Management Plan
Application.
c. Two (2) collated copies of all supporting information pertaining to this project including:
i. A breakdown of built upon or impervious areas within each drainage area.
ii. Pond sizing calculations.
iii. Water quality (design) volume calculations.
iv. Treatment volumes provided in the ponds between the permanent pool and the
next opening above the drawdown orifice.
V. Drawdown (orifice sizing) calculations of the new design volumes.
vi. Signed and notarized Operation & Maintenance Agreements for the BMPs.
d. Two collated copies of full size plans (with detailed construction information) including, but
not limited to, the following:
i. Existing conditions map of project area.
ii. Site grading plan showing existing and proposed contours, and delineated
drainage areas to the BMPs.
iii. Plan and cross sectional views of the BMPs showing detailed information.
Wilmington, NC . Telephone [phone] . Fax [phone] . email: [e-mail]
Southern Pines . Charlotte
Dec. 8, 2009
DWQ Permit Number 00-1048v2
Cover Letter to Karoly
iv. Construction sequence including sediment and erosion control measures to
ensure that the newly constructed site would be stabilized prior to sending runoff
to the BMPs.
e. One (1) data CD of full size plans.
We are proposing no additional changes to the approved stormwater permit, besides constructing this new
building and increasing the size of the orifices in Ponds 1 and 2. We feel this submittal meets all the
requirements for the Stormwater Management Program and look forward to your expedient review.
Please contact me if you have any questions or require any additional information. Thanks.
Sincerely,
Hobbs, Upchurch & Associates, P.A.
??K
Joe Boyd
Page 2 of 2
Permit No. U0 00 - % O 1A V *4'
(to be provided by Dff"Q)
State of North Carolina
Department of Environment and Natural Resources
DiAsion of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT - POND 2
This form may be photocopied for use as an original
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin. design calculations, and plans and specifications showing all basin and outlet
structure details.
1. PROJECT INFORMATION
Project Name: Lanesboro Correctional Institution
Contact Person: Jeff Thompson. PE Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: Pond 2
elevations
Basin Bottom Elevation 292.0 ft
Permanent Pool Elevation 295.0 ft
Temporary Pool Elevation 297.9 ft
areas
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
Permanent Pool Surface Area 9.402 sq. ft. (water surface area at the orifice elevation)
Drainage Area 3.93 ac. (on-site and off-site drainage to the basin)
Impervious Area 3.28 ac. (on-site and off-side drainage to the basin)
(2.91 ac. previously permitted, 0.37 ac. additional proposed)
volumes
Permanent Pool Volume 17,049 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA i
Diameter of Orifice
Design Rainfall
Design TSS Remova12
38.582 cu. ft. (volume detained above the permanent pool)
3.322 cu. ft. (approximateh, 20%oftotal volume)
3.51
(sub jace area to drainage area ratio7S•om DJ1 Q table)
1.5 in. (2 to 5 day temporary pool draw-down required)
in.
85 % (minimum 85% required)
Form S WU-102 Rev 3.99 Page 1 of 4
Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be
computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be
employed to determine the correct value for nonstandard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is
designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS
removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices
Manual (N.C. Department of Environment. Health and Natural Resources, February 1999) and
Administrative Code Section: 15 A NCAC 2H.1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management
Permit Application Form, the agent may initial below. If a requirement has not been met, attach
justification.
Applicants Initials
_5513 a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
.\1515 b. The forebay volume is approximately equal to 20% of the basin volume.
,X45 c. The temporary pool controls runoff from the design storm event.
1\5$ d. The temporary pool draws down in.) to S days.
-)1515 e. If required. a 30-foot vegetative filter is provided at the outlet (include non-erosive
flog- calculations)
_`g f. The basin length to width ratio is greater than 3:1.
.a55 g. The basin side slopes above the permanent poo 1 are no steeper than 3:1.
_ 1566 h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show
detail).
-'15S i. Vegetative cover above the permanent pool elevation is specified.
.,sg j. A trash rack or similar device is provided for both the overflow and orifice.
.1569 k. A recorded drainage easement is provided for each basin including access to
nearest right-of-way.
. 1. If the basin is used for sediment and erosion control during construction, clean out
of the basin is specified prior to use as a wet detention basin.
in. 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 ,vet detention basin. pretreatment including forebays
and the vegetated filter if one is provided.
This system (check one) X does _ does not incorporate a vegetated filter at the outlet.
This system (check one) _ does X does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool
occurs within 2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be
disposed of in an appropriate manner and shall be handled in a manner that will not adversely
impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an
accurate depth reading and not readily penetrate into accumulated sediments.
When the permanent poo 1 depth reads 2.25 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 3.0_ feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
299.0
Permanent Pool Elevation 295.0
Sediment Re val El. 296.0 75%
75%
Sediment Removal Elevation 292.75
BottomEle lion 295.0 LSo. ______________..__ _
Bottom Elevation 292.0 1 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 he minimized to the maximum extent practical.
7. All components of the wet detention basin system shall he maintained in good working order.
Form SWU-102 Rev 3.99 Page 3 of4
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: William N. Stovall PE
Title: Director of Engineering Central Engineering Division, NC Department of Correction
Address: 2020 Yonkers Road, Raleigh, NC 27609
Phone: [phone]
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless inure than 50% of the lots
have been sold and a resident of the subdivision has been named the president.
I, i?n,'C © 13.; 4,11J , a Notary Public for the State of 4)ur LcrtJ, h4.
County of J jj r, 5 f err , do hereby certify that r Aj. V /.I
personally appeared before me this ` day of 124°C&,u &e v -?D and
acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness
my hand and official seal,

SEAL
My commission expires l-'Z - v? /- Q 2
Form SWU-102 Rev 3.99 Page 4 of 4
btp co 1 0 4 8 1) a
OFFICE USE ONLY
Date Received Fee Paid Permit Number(s)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality 401/Wetlands Unit
EXPRESS REVIEW PROGRAM STORMWATER MANAGEMENT APPLICATION FORM
This form may be photocopied for use as an original
1. GENERAL INFORMATION
1. APPLICANT'S NAME (specify the name of the corporation, individual, etc. who owns the project):
North Carolina Department of Corrections
WNER/SIGNING OFFICIAL'S NAME AND TITLE (person legally responsible for facility and
2.O
compliance): William N. Stovall, Director of Engineering
3. OWNER MAILING ADDRESS (for person listed in item 2 above):
2020 Yonkers Road
Raleigh, NC 27604
4. OWNER ADDITIONAL CONTACT INFORMATION:
Phone: [phone] Fax: [phone] Email:
5. PROJECT NAME (subdivision, facility, or establishment name - should be consistent with project name
on plans, specifications, letters, inspection and maintenance agreements, etc.):
Lanesboro Correctional Institute
6. PROJECT LOCATION:
Street Address: 552 Prison Camp Road
City: Polkton County: Anson State: NC Zip Code: 28135
Latitude: 34 59' 12" N Longitude: 80 11' 3" W
DIRECTIONS TO PROJECT SITE (from nearest major intersection):
7
.
The site is located about 0.75 miles south of Prison Camp Road (SR 1121) and U.S. Hwy 74 intersection, near the
city of Polkton.
8. CONTACT PERSON (who can answer stormwater-related questions about the project):
Name: Jeff Thompson Company: Hobbs, Upchurch & Associates
Phone: [phone] Fax: [phone] Email: [e-mail]
1/2009 Version 1.1 Page 1 of 5
II. PERMIT INFORMATION
A RENEWAL ?X A MODIFICATION
1. THE PROJECT IS (check one): ? NEW ?
2. OTHER JURISDICTIONS:
Which local government(s) has jurisdiction over the project (e.g. Town of Cary or Johnston County)?:
North Carolina Department of Corrections
3. STORMWATER MANAGEMENT PROGRAM
Check all of the state-approved stormwater management programs (implemented by either the State or
local government) that apply to your project:
Neuse or Tar-Pamlico NSW
? Phase II Post Construction ? Water Supply Watershed ?
? Randleman WSWS ? USMP ? Coastal Counties ? HQW ? ORW
4. PERMIT HISTORY (renewal or modification requests must complete this item):
Date Issued: June 28, 2001
Existing DWQ Permit Number: 004048
5. PROJECT TYPE (check one): ? Low Density* ?X High Density*
* Low Density projects shall be under 24% Impervious with only vegetated stormwater conveyances. A
curb and gutter or pipe system for stormwater conveyance shall result in reclassification of project as
High Density even if below 24%, except when pipes are used for road or driveway crossing purposes.
6. ADDITIONAL PROJECT REQUIREMENTS (check all that apply):
? CAMA Major 0 Sedimentation/Erosion Control ? NPDES Stormwater
? 404/401 Permit ? Non-404 Jurisdictional Permit ? Other:
Note: Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748
III. PROJECT INFORMATION
1. STORMWATER TREATMENT METHODS (Describe briefly how stormwater will be treated):
Stormwater will be collected and treated in Wet Detention Basins
Important Note: attach a detailed narrative (one to two pages) describing stormwater management for the
project.
2. RIVER BASIN/STREAM INFORMATION
a. Stormwater runoff from this project drains to which River Basin?: Yadkin
b. Nearest named stream: Little Brown Creek
c. Water quality classification of nearest named stream: C
1/2009 Version 1.1 Page 2 of 5
3. TOTAL PROJECT AREA: I 177.3 (acres)
4. PROJECT BUILT UPON AREA: I 7%
5. DRAINAGE AREAS (How many drainage areas does the project have?): 3
n ervious* Surface Area Determination (Breakdown) Drainage Area 2
Impervious* Surface Area Drai?n,ge Area I
On-site Buildings
On-site Streets
On-site Parking
On-site Sidewalks
Other on-site
Off-site
Total: Total:
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking
areas, sidewalks, gravel areas, etc.
6. EXPLAIN HOW THE OFF-SITE IMPERVIOUS AREA WAS DERIVED:
n/a
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
Deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and
future development draining to the proposed stormwater management devices prior to the sale of any lot. If
applicable, please complete and submit a copy of the deed restrictions and protective covenants along with
your application.
1/2009 Version 1.1 Page 3 of 5
Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
V. SUPPLEMENT FORMS
The applicable stormwater management supplement form(s) listed below must be submitted for each
BMP specified for this project. The most current form(s) located on the 401/wetlands unit website at
http://h2o.enr.state.nc.us/su/bmp forms.htm must be used. Please include both the Design Summary and
the Required Items Checklist along with all required items and supporting design calculations.
(Check the supplement forms that will be required for your project):
A B ff
? Bioretention Supplement
? Dry Detention Supplement
? Grassed Swale Supplement
? Infiltration Basin Supplement
? Infiltration Trench Supplement
VI. SUBMITTAL REQUIREMENTS
? Level Spreader/Filter Strip/Restore u er
Supplement
? Sand Filter Supplement
? Stormwater Wetland Supplement
?X Wet Detention Supplement
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the DWQ Central Office.
1. Please indicate that you have provided the following required information by initialing in the space
provided next to each item. Initials
• Original and two copies of the Express Review Stormwater Management Application
• Signed and Notarized Inspection and Maintenance Agreement
• Three copies of the applicable Supplement Form(s) for each BMP
• Application processing fee (payable to DWQ)
• Detailed narrative description of stormwater treatment/management --
• Three copies of plans and specifications, including:
?X Development/Project name
X? Engineer and firm
XO Legend
?X North arrow
?X Scale
X? Revision number & date
?X Mean high water line
?X Dimensioned property/project boundary
?X Location map with named streets or NCSR numbers
?X Original contours, proposed contours, spot elevations, finished floor elevations
?X Details of roads, drainage features, collection systems, and stormwater control measures
?X Wetlands and streams delineated, or a note on plans that none exist
?X Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations
?X Drainage areas delineated
?X Vegetated buffers (where required)
1/2009 Version 1.1 Page 4 of 5
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
1. DESIGNATED AGENT (individual or firm): Hobbs, Upchurch & Associates
2. MAILING ADDRESS:
8262-201 Market Street
Wilmington, NC 28411
Phone: [phone] Fax: [phone]
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2)
William N. Stovall , certify that the information included on this application form is, to
the best of my knowledge, correct and that the project will be constructed in conformance with the approved
plans, that the required deed restrictions and protective covenants (if applicable) will be recorded, and that the
proposed project complies with the requirements of 15A NCAC 2H.1000.
CC
Y1 . Date:
Signature:
1/2009 Version 1.1 Page 5 of 5
Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT - POND 1
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
1. PROJECT INFORMATION
Project Name: Lanesboro Correctional Institution
Contact Person: Jeff Thompson PE Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: Pond 1
elevations
Basin Bottom Elevation 295.0 ft. (floor of the basin)
Permanent Pool Elevation 298.0 ft. (elevation of the orifice)
Temporary Pool Elevation 300.9 ft. (elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area
17,395
sq. ft. (water surface area at the orifice elevation)
Drainage Area 16.61 ac. (on-site and off-site drainage to the basin)
Impervious Area 7.25 ac. (on-site and off-side drainage to the basin)
(7.07 ac. previously permitted, 0.18 ac. additional proposed)
volumes
Permanent Pool Volume
39,303
cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume 69,844 cu. ft. (volume detained above the permanent pool)
Forebay Volume 8,822 cu. ft. (approximately 20% of total volume)
Other parameters
1 1'86 (surface area to drainage area ratio from DWQ table)
SA/DA
Diameter of Orifice 2.0 in. (2 to 5 day temporary pool draw-down required)
Design Rainfall 1 in.
Design TSS Remova12 85 % (minimum 85% required)
Form SWU-102 Rev 3.99 Page 1 of 4
Footnotes:
1 When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be
computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be
employed to determine the correct value for nonstandard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is
designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS
removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices
Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and
Administrative Code Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management
Permit Application Form, the agent may initial below. If a requirement has not been met, attach
justification.
Applicants Initials
a.
>' 515
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
?S=v b. The forebay volume is approximately equal to 20% of the basin volume.
1ST c. The temporary pool controls runoff from the design storm event.
1?`?' d. The temporary pool draws down in 2 to 5 days.
S e. If required, a 30-foot vegetative filter is provided at the outlet (include non-erosive
flow calculations)
5 f. The basin length to width ratio is greater than 3:1.
?s g. The basin side slopes above the permanent poo 1 are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show
detail).
i. Vegetative cover above the permanent pool elevation is specified.
j. A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to
nearest right-of-way.
1. If the basin is used for sediment and erosion control during construction, clean out
of the basin is specified prior to use as a wet detention basin.
15 ' in . 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) X_ does _ does not incorporate a vegetated filter at the outlet.
This system (check one) _ does X does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool
occurs within 2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be
disposed of in an appropriate manner and shall be handled in a manner that will not adversely
impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an
accurate depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 2.25 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 3.4 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
ill in the blanks)
304.0
Sediment Re val E. 300.6 75%
Bottom Ele tion 299.5 25%
FOREBAY
Permanent Pool Elevation 299.0
75%
Sediment Removal Elevation' 295.75
--------------------- ---
Bottom Elevation 295.0 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 he minimized to the maximum extent practical.
7. All components of the wet detention basin system shall he maintained in good working order.
Form SWU-102 Rev 3.99 Page 3 of 4
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: William N. Stovall, PE
Title: Director of En ineering, Central Engineering Division, NC Department of Correction
Address: 2020 Yonkers Road, Raleigh, NC 27609
19/716-3400
Signature:
Date: ??CCel
Note: The legally responsible party should not be a homeowners association unless inure than 50% of the lots
have been sold and a resident of the subdivision has been named the president.
1, e-onn+c-- , a Notary Public for the State of AL)?A o-,, /-f,l,`NQ
County of Je) do hereby certify that 011l('a wt ?)- j /G cq /
personally appeared before me this _ day of ;T ec e-,Y be,-I'
, -? 60 , and
acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness
my hand and official seal,
SEAL
cz.?...w fi??-sue
My commission expires IR -a / -I,IjO V
Form SWU-102 Rev 3.99 Page 4 of 4
Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT - POND 2
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
1. PROJECT INFORMATION
Project Name: Lanesboro Correctional Institution
Contact Person: Jeff Thompson, PE Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: Pond 2
elevations
Basin Bottom Elevation 292.0 ft. (floor of the basin)
Permanent Pool Elevation 295.0 ft. (elevation of the orifice)
Temporary Pool Elevation 297.9 ft. (elevation of the discharge structure overflow)

areas
Permanent Pool Surface Area 9,402 sq. ft. (water surface area at the orifice elevation)
Drainage Area 3.93 ac. (on-site and off-site drainage to the basin)
Impervious Area 3.28 ac. (on-site and off-side drainage to the basin)
(2.91 ac. previously p ermitted, 0.37 ac. additional proposed)
volumes
Permanent Pool Volume 17,049 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DAI
Diameter of Orifice
Design Rainfall
Design TSS Remova12
38,582 cu. ft. (volume detained above the permanent pool)
3,322 cu. ft. (approximately 20% of total volume)
3.51
1.5
(surface area to drainage area ratio from DWQ table)
in. (2 to S day temporary pool draw-down required)
1 in.
85 %
(minimum 85% required)
Form SWU-102 Rev 3.99 Page 1 of 4
Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be
computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be
employed to determine the correct value for nonstandard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is
designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS
removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices
Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and
Administrative Code Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management
Permit Application Form, the agent may initial below. If a requirement has not been met, attach
justification.
Applicants Initials
a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
-3 b. The forebay volume is approximately equal to 20% of the basin volume.
.? c. The temporary pool controls runoff from the design storm event.
-? d. The temporary pool draws down in 2 to S days.
e. If required, a 30-foot vegetative filter is provided at the outlet (include non-erosive
flow calculations)
f. The basin length to width ratio is greater than 3:1.
g. The basin side slopes above the permanent poo 1 are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show
detail).
,1Sg i. Vegetative cover above the permanent pool elevation is specified.
=??'? i. A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to
nearest right-of-way.
1. If the basin is used for sediment and erosion control during construction, clean out
of the basin is specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an
emergency.
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays
and the vegetated filter if one is provided.
This system (check one) X does _ does not incorporate a vegetated filter at the outlet.
This system (check one) does X does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool
occurs within 2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be
disposed of in an appropriate manner and shall be handled in a manner that will not adversely
impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an
accurate depth reading and not readily penetrate into accumulated sediments.
When the permanent poo 1 depth reads _2.25_ feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 3.0 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
ill in the blanks)
299.0 Permanent Pool Elevation 295.0
Sediment Re val El. 296.0 75%
75%
295.0 Sediment Removal Elevation' 292.75
Bottom Ele tion 25°/
Bottom Elevation 292.0 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 he minimized to the maximum extent practical.
7. All components of the wet detention basin system shall he maintained in good working order.
Form SWU-102 Rev 3.99 Page 3 of 4
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: William N. Stovall PE
Title: Director of Eng_ineering Central Engineering Division NC Department of Correction
Address: 2020 Yonkers Road Raleigh NC 27609
Phone: [phone]
Signature: (? c oca n- 1 ?
Date: ,?¢c? ?.; ,2C?c?I
Note: The legally responsible party should not be a homeowners association unless inure than 50% of the lots
have been sold and a resident of the subdivision has been named the president.
1, 0 34 r lc;-J , a Notary Public for the State of &f rrr.?, 4
County of h tj .5 t o-r- , do hereby certify that xj.
personally appeared before me this _24?- day of b e ?- and
acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness
my hand and official seal,
SEAL

My commission expires f - A' / - Q 2
Form SWU-102 Rev 3.99 Page 4 of 4
F, xQ vfl - I D 4 2 L)
STORMWATER NARRATIVE & CALCULATIONS
for the
LANESBORO COUNTY CORRECTIONAL INSTITUTE
N.C. Department of Corrections
Anson County, North Carolina
1
? tor?ee
f
i ?
SEA!
• e
? O
33!52 •
Prepared By
Hobbs, Upchurch & Associates, P.A.
8262-201 Market Street
Wilmington, North Carolina 28411
December 2009
Stormwater Management Narrative
Lanesboro Correctional Institute
Anson County
December 3, 2009
Proiect Description
The purpose of this project is to design and build an additional building to the already
constructed Lanesboro Correctional Institute. The work proposed will be to remove any existing
structures, grade the site, construct the facility, install storm water controls and establish
vegetation. The total project area is approximately 177 acres and already has three (3) existing
wet detention basins to control the stormwater runoff; the project will only disturb approximately
2 acres for the new building facility itself. The project was previously permitted on June 28,
2001 by the North Carolina Division of Water Quality. Its permit number is 001048.
Site Description
The site is located at 522 Prison Camp Road, about 0.75 miles south of the intersection of
Prison Camp Road (SR 1121) and U.S. Highway 74. Slopes range between 0 and 15%,
naturally sloping to the south and west. The site is cleared with the prison attached to the
south, with other adjacent security complexes to the east, and surrounded by woodlands then
after.
Adjacent Property
Land use in the vicinity of the project is primarily natural woodland with other security complexes
nearby and a residential development more to the north.
Stormwater Measures
The project area as identified earlier has slopes ranging from 0 to 15%, however on the portion
of the site which the prison resides the land is nearly flat to gently sloping ranging from 0 to 5%.
The area has existing drainage structures and new structures are proposed. Stormwater
measures proposed for this project are to collect runoff from the additional building and
discharge the stormwater into the existing Ponds 1 and 2. All ponds on site were designed for
the stormwater regulations before the Phase Il Post Construction regulations were introduced
and therefore do not meet the new stormwater rules.
Through prior discussions with NCDENR at the Washington Regional Office, any ponds taking
additional impervious area that were designed previously under old rules can be designed under
the old regulations as long as they can handle the volume from 1" storm event.
There are three ponds on site that collect all the impervious area from the site. As stated, only
Ponds 1 and 2 will take any additional runoff from the new proposed structure. Both of these
ponds as designed with an increased orifice are able to hold the additional volume from the 1"
storm event and discharge it within the 2 to 5 day required period. Due to this the only changes
proposed to the ponds are to increase the orifice sizes for Ponds 1 and 2 by 0.5 inches each, no
other changes are proposed to the already constructed ponds. Please see attached
calculations. Pond 3 will remain as previously designed and due to there being no additional
impervious going to this pond it has been designed to hold the volume from 1" storm event.
HADC0901 - Lanesboro Prison EC & SWM\Project Management\Stormwater\090914-Lanesboro Prison-Narrative.docx
Soils
The site consists of dominant soil types of Badin channery silt loam (BaC), Chewacla loam
(ChA), Creedmoor fine sandy loam (CrB), Mayodan gravelly sandy loam (MgB), and Udorthents
loam (UdC), respectively. The Badin series consists of well drained soils and high permeability
with slopes ranging from 8 to 15 percent. The Chewacla loam consists of somewhat poorly
drained soil and low permeability with slopes ranging from 0 to 2 percent. The Creedmoor
series is moderately well drained soil with moderate permeability and has slopes ranging from 2
to 8 percent. The Mayodan series consist of well drained soils with high permeability and
slopes that range from 2 to 8 percent. The Udorthents series consists of well drained soils with
high permeability and slopes ranging from 0 to 15 percent. The following table lists the erosion
properties of the respective soil series.
Map Symbol % of map Hyd. Kf Tfactor Representative Value
unit Group % Sand %Silt %Clay
BaC 19.9 B 0.37 3 27.1 54.4 18.5
ChA 7.2 C 0.28 5 39.8 37.7 22.5
CrB 0.9 C 0.28 4 66.5 20.0 13.5
MgB 55.1 B 0.17 5 67.9 19.6 12.5
UdC 14.3 B 0.24 5 59.6 17.9 22.5
HADC0901 - Lanesboro Prison EC & SWM\Project Management\Stormwater\090914-Lanesboro Prison-Narrative.docx
Pond #1
Lanesboro Correctional Institute
Wet Detention Basin Design
DRAINAGE AREA (Ad) = 723,532 SQ. FT
EXISTING IMPERVIOUS AREA (Ai): 307,969 SQ. FT
ADDITIONAL IMPERVIOUS AREA (Ai):
BUILDINGS: 7,863 SQ. FT
ROADS: 0 SQ. FT
SIDEWALKS: 0 SQ. FT
OFF-SITE 0 SQ. FT
CONTINGENCY: 0 SQ. FT
TOTAL: 315,832 SQ. FT
PERCENT IMPERVIOUS (1):
I = Ad/Ai = 43.65% (SAY 4496)
POND #1 SHALL HAVE A DEPTH OF 3' AS PREVIOUSLY PERMITTED
AND BE DESIGNED TO REMOVE 85% TSS.
SA/DA= 1.86%
SAREQ_= 13,458 SF. = 0.31 AC
SURFACE AREA PROVIDED AT PERMANENT POOL (ELEV. 298.0) = 17,395 SF
SA PROV'D= 17,395 > 13,458 =SA REQ'D OK
POND #1
DATA SHEET
PAGE 1 OF 4
H:\DC0901- Lanesboro Prison EC & SW M\SWM\090909- Pond 1-1B-OLD RULES-adjusted-calc
MINIMUM REQUIRED VOLUME (SIMPLE METHOD BY TOM SCHUELER):
Rv=0.05+0.009 * (I )
Rv= 0.44286326
VOLUME= 1"*Rv*Ad = 0.612996556 AC-FT
26,702 FT^3
VOLUME PROVIDED AT TEMPORARY POOL:
INCREM. TOTAL (S)
EL. SA SF VOL. CF VOL. CF
298 17,395 0 0
299 20,569 18,982 18,982
300 27,595 24,082 43,064
301 31,916 29,755 72,819
MINIMUM TEMP. POOL ELEVATION (FROM SIMPLE METHOD VOLUME):
REQ'D EL.= 299.4
VOL. PROV'D = 28,615 CF
TEMP. POOL ELEVATION:
OUTLET EL. = 300.90
VOL. PROV'D = 69,844 CF
NOTE: SINCE THE ELEVATION OF THE NEXT AVAILABLE OUTLET ABOVE THE NORMAL POOL
IS GREATER THAN THE MINIMUM TEMP. POOL ELEVATION, THE OUTLET ELEVATION
IS THE TEMPORARY POOL ELEVATION.
VOL. PROV'D= 69,844 > 26,702 =VOL. REQ'D OK
POND #1
DATA SHEET
PAGE 2 OF 4
H:\DC0901- Lanesboro Prison EC & SWM\SWM\090909-Pond 1-JB-OLD RULES-adjusted-calc
FOREBAY SIZING:
PERMANENT POOL VOLUME:
INCREM. TOTAL
EL. SA SF VOL. CF VOL. CF
295 9,075 0 0
296 11,647 10,361 10,361
297 14,421 13,034 23,395
298 17,395 15,908 39,303
REQ'D VOLUME = 20% TOTAL =
CHECK FOREBAY VOLUME:
7,861 CF
INCREM. TOTAL
EL. SA SF VOL. CF VOL. CF
300 3,651 0 0
301 4,397 4,024 4,024
302 5,198 4,798 8,822
303 6,057 5,628 14,449
PROV'D VOLUME = 8,822 CF (3' DEEP FOREBAY)
VOL. PROV'D= 8,822 7,861 =VOL. REQ'D NG
POND #1
DATA SHEET
PAGE 3 OF 4
H:\DC0901 - Lanesboro Prison EC & SWM\SWM\090909-Pond 1-JB-OLD RULES-adjusted-calc
ORIFICE SIZING: REQ'D DRAWDOWN TIME = 2-5 DAYS
NOTE: ORIFICE SIZED TO DRAWDOWN THE TEMPORARY POOL IN 2-5 DAYS
Q2= 0.15453 CFS (FOR 2 DAY DRAWDOWN)
Q5= 0.06181 CFS (FOR 5 DAY DRAWDOWN)
ORIFICE EL.= 298 (PERM. POOL EL.)
TEMP. POOL EL. = 300.90 (OUTLET EL.)
ORIFICE DIAMETER = 2.0 IN.
Q PROV'D= Cd*A*(2gh)^1/2 WHERE: Cd= 0.6
A= 0.0218166 SF
g= 32.2 FPS/S
h= (TEMP POOL-NORMAL POOL)/3
= 0.9666667
Q PROV'D= 0.10328
Q2> 0.10328 >Q5 OK
DRAWDOWN TIME:
TIME= VOLUME = 2.99 DAYS
Q PROV'D
POND #1
DATA SHEET
PAGE 4 OF 4
H:\DC0901 - Lanesboro Prison EC & SWM\SWM\090909-Pond 1-1B-OLD RULES-adjusted-calc
Pond #2
Lanesboro Correctional Institute
Wet Detention Basin Design
DRAINAGE AREA (Ad) = 171,191 SQ. FT
EXISTING IMPERVIOUS AREA (Ai): 126,760 SQ. FT
ADDITIONAL IMPERVIOUS AREA (Ai):
BUILDINGS: 16,227 SQ. FT
ROADS: 0 SQ. FT
SIDEWALKS: 0 SQ. FT
OFF-SITE 0 SQ. FT
CONTINGENCY: 0 SQ. FT
TOTAL: 142,987 SQ. FT
PERCENT IMPERVIOUS (1):
I = Ad/Ai = 83.52% (SAY 84%)
POND #2 SHALL HAVE A DEPTH OF 3' AS PREVIOUSLY PERMITTED
AND BE DESIGNED TO REMOVE 85% TSS.
SA/DA= 3.51%
SAREQ.= 6,009 SF. = 0.14 AC
SURFACE AREA PROVIDED AT PERMANENT POOL (ELEV. 295.0) = 9,402 SF
SA PROV'D= 9,402 > 6,009 =SA REQ'D OK
POND #2
DATA SHEET
PAGE 1 OF 4
H:\DC0901 - Lanesboro Prison EC & SWM\SWM\090909-Pond 2-JB-OLD RULES-adjusted-calc
MINIMUM REQUIRED VOLUME (SIMPLE METHOD BY TOM SCHUELER):
Rv=0.05+0.009*(I)
Rv= 0.80172229
VOLUME= 1"*Rv*Ad = 0.26256405 AC-FT
11,437 FT^3
VOLUME PROVIDED AT TEMPORARY POOL:
INCREM. TOTAL
EL. SA SF VOL. CF VOL. CF
295 9,402 0 0
296 11,938 10,670 10,670
297 14,708 13,323 23,993
298 17,712 16,210 40,203
MINIMUM TEMP. POOL ELEVATION (FROM SIMPLE METHOD VOLUME):
REQ'D EL.= 296.1
VOL. PROV'D = 12,003 CF
TEMP. POOL ELEVATION:
OUTLET EL. = 297.90
VOL. PROV'D = 38,582 CF
NOTE: SINCE THE ELEVATION OF THE NEXT AVAILABLE OUTLET ABOVE THE NORMAL POOL
IS GREATER THAN THE MINIMUM TEMP. POOL ELEVATION, THE OUTLET ELEVATION
IS THE TEMPORARY POOL ELEVATION.
VOL. PROV'D= 38,582 > 11,437 =VOL. REQ'D OK
POND #2
DATA SHEET
PAGE 2 OF 4
H:\DC0901- Lanesboro Prison EC & SWM\SWM\090909-Pond 2-JB-OLD RULES-adjusted-calc
FOREBAY SIZING:
PERMANENT POOL VOLUME:
INCREM. TOTAL
EL. SA SF VOL. CF VOL. CF
292 3,000 0 0
293 4,557 3,778 3,778
294 6,291 5,424 9,202
295 9,402 7,847 17,049
RECQ'D VOLUME = 20% TOTAL = 3,410 CF
CHECK FOREBAY VOLUME:
INCREM. TOTAL
EL. SA SF VOL. CF VOL. CF
295 1,200 0 0
296 1,647 1,423 1,423
297 2,150 1,899 3,322
298 2,711 2,431 5,753
PROV'D VOLUME = 3,322 CF (3' DEEP FOREBAY)
VOL. PROV'D= 3,322 3,410 =VOL. REQ'D OK
POND #2
DATA SHEET
PAGE 3 OF 4
HADC0901- Lanesboro Prison EC & SWM\SWM\090909-Pond 2-JB-OLD RULES-adjusted-calc
ORIFICE SIZING: REQ'D DRAWDOWN TIME = 2-5 DAYS
NOTE: ORIFICE SIZED TO DRAWDOWN THE TEMPORARY POOL IN 2-5 DAYS
Q2= 0.06619 CFS (FOR 2 DAY DRAWDOWN)
Q5= 0.02648 CFS (FOR 5 DAY DRAWDOWN)
ORIFICE EL.= 295 (PERM. POOL EL.)
TEMP. POOL EL. = 297.90 (OUTLET EL.)
ORIFICE DIAMETER = 1.5 IN.
Q PROV'D= Cd*A*(2gh)^1/2 WHERE: Cd= 0.6
A= 0.0122718 SF
g= 32.2 FPS/S
h= (TEMP POOL-NORMAL POOL)/3
= 0.9666667
Q PROV'D= 0.05810
Q2> 0.05810 >Q5 OK
DRAWDOWN TIME:
TIME= VOLUME = 2.28 DAYS
Q PROV'D
POND #2
DATA SHEET
PAGE 4 OF 4
H:\DC0901- Lanesboro Prison EC & SWM\SWM\090909-Pond 2-JB-OLD RULES-adjusted-calc
F.xp oo- tv48 v 2?
Previously Permitted Pond
Operation and Maintenance
Agreements
1?t.\
Permit No.
(to be provided by DWQ)
State of North Carolina
Department of environment and Natural Resources
. %I._ Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
suppleiaent for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
1. PROJECT INFORMATION
Project Name: to 00 Cez L C"St' SE C'v.-ir'J- X C?v,-ry
Contact Person: 11-1 647 rts N L D 0 c Phone Number: (T q ) 71 6 ¢'/-0
For projects with multiple basins, specify which basin this worksheet applies to:
elevations
Basin Bottom Elevation 2-q 5-, 0 ft. (floor of the basin)
Permanent Pool Elevation g, (U ft. (elevation of the orifice)
Temporary Pool Elevation 3 00.9 ft. (elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area 7 00 sq. ft. (water surface area at the orifice elevation)
Drainage Area 6, to ? ac. (on-site and off-site drainage to the basin)
Impervious Area -7.07 ac. (on-site and off-site drainage to the basin)
volumes
Permanent Pool Volume 5 7 1 6 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume 3 21-0cu. ft. (volume detained above the permanent pool)
Forebay Volume O O cu. ft. (approximately 20% of total volume)
Other parameters
SA/DA I ?. 10 ? (surface area to drainage area ratio from DWQ table)
Diameter of Orifice 57 in. (2 to 5 day temporary pool draw-down required)
Design Rainfall 1, 0 in. k0,4ofr C(D,09 1.//0- `'!O wz S'Top-.r)
Design TSS Removal 2 '15 % (minimum 85% required)
Form SWU-102 Rev 3.99 Page I of 4
Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
A VA
a.
?D I b.
C'? ffv?t c.
CD Y d.
Gad' _ e.
G4l EfVh g.
k h.
CD
G6ly1ffV,4 j.
92 f lf k.
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The forebay volume is approximately equal to 20% of the basin volume.
The temporary pool controls runoff from the design storm event.
The temporary pool draws down in 2 to 5 days.
If required, a 30-foot vegetative filter is provided at the outlet (include non-erosive flow
calculations)
The basin length to width ratio is greater than 3:1.
The basin side slopes above the permanent pool are no steeper than 3:1.
A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
Vegetative cover above the permanent pool elevation is specified.
A trash rack or similar device is provided for both the overflow and orifice.
A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
D!o' /t 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.
C t9t /tl/?f 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) Wdoes 0 does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 3.0 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation vis O
Sediment Re oval El. 3 OJ-S 75 0
-------------- - Sediment Removal Elevation 'L9 S1 7S 75%
Bottom Ele ation 4q. S % ----------------------------------------- -----
io Elevation 2-15-, --f25%
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 of4
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: // 5to?')//
Title: ,Q cc fo d Ir EN , iJ e'r.?'iN
Address: /yoAll, C?,to/,",9 c4' CoR?r?t>`cN ?`ziG rMSc.. k
Phone: l 9/s) 7/4 - 31100
Signature: G(l ?c?°ca,.. 'V. eh'r
Date: '-?' 'U/
C, C/
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, VtMn ICw I=Qc? , a Notary Public for the State of Wtt?? jnC?.
County of do hereby certify that ?Jl?? i cl? ?--ho 110..,
personally appeared before me this ) ry - day of -SN _,0Z 00 and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires C ^S - ON--AD
Form SWU-102 Rev 3.99 Page 4 of4
,, .., i n ?..001
Permit No.
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
(to be provided by DWQ)
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
I. PROJECT INFORMATION
Project Name: _1000 C Eta- CSe Sec, o_t TY A" so?v - /4n_ s a.A? au.o0Tr
Contact Person: St,n (-?, -5 Al L Do C- Phone Number: (91 q L-716 3 ¢f
For projects with multiple basins, specify which basin this worksheet applies to: -. o-to Ak, 2
elevations
Basin Bottom Elevation 2, q 7, 0 ft. (door of the basin)
Permanent Pool Elevation 2 q ?`• 0 ft. (elevation of the orifice)
Temporary Pool Elevation 2- q -7. 9 ft. (elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area g I Z sq. ft. (water surface area at the orifice elevation)
Drainage Area 3, 9 3 ac. (on-site and off-site drainage to the basin)
Impervious Area 2, 9 ac. (on-site and off-site drainage to the basin)
volumes
Permanent Pool Volume 2 -300 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume 33,500 cu. ft. (volume detained above the permanent pool)
Forebay Volume 630 cu. ft. (approximately 20% of total volume)
Other parameters
SA/DA 1 3, 9 ?e (surface area to drainage area ratio from DWQ table)
Diameter of Orifice 1.O in. (2 to S d76, temporary pool draw-down required)
Design Rainfall ?. in. #---Off Oq oV`ivs- _ !D y„_ sr"?"`J
Design TSS Removal 2 % (minimum 85% required) J
Form SWU-102 Rev 3.99 Page 1 of 4
Footnotes:
t When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
C? a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
e. If required, a 30-foot vegetative filter is provided at the outlet (include non-erosive flow
calculations)
f. The basin length to width ratio is greater than 3:1.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
j. A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
1. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
cae Pvl+ 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) `ti; does 0 does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Pagc 2 of4
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads Z,ZS . feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 2,157 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
V Permanent Pool Elevation 2q S, 0
Sediment Re oval El. 295.75 2 2 7 5
-------------i;c Sediment Removal Elevation , 75%
Bott om Ele ation 2,T X --------------------------------------------- 125%
Bottom Elevation *Ly2, 0 FOREBAY MAIN POND

5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form SWU-102 Rev 3.99 Page 3 of 4
7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name: ZJ y/,',g" /,
Title:
Address:_ log /A CARo/,:v,4 L;g,-;Ail ze ri o-? CoAKC"/*??. 5w6 'rsc. /??,F/'/.C 1 7(17( -%j/G
Phone: 716 3yo0
Signature: -77. 1e?-
Date: R, .?co/
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.
1'V e-t' n l cc, m D t 1(.t? 1 , a Notary Public for the State of "u?-A C O-M: 11 cam,
County of WG-?L , do hereby certify that i ?? O CY1 S'6UG.k k
personally appeared before me this ar\j day of 10mkcGR.c ), and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires Cj oZcc?
Form SWU-102 Rev 3.99 Page 4 of 4
OHMWATER AND EROSION CONTROL PLAN
FOR THE
LANESBORO CORRECTIONAL INSTITUTE
N.C. DEFtM1t=NT AROF CORRECTIONS
ANSON COUNTY, NORTH CAROLINA
COUNTY MAP
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1qj Hobbs, chinch Associates, PA.
Consulting Engineers
Wilmington, Nodh Carolina 28411
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STORMVIVATER MANAGEMENT POND 3 SECTION
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B'MAX MSTR.-4GTH FABR'!C WIIM WIRE FESCi J
PMA'u Cx'Rd IRENGTRFABRIC AiTHCWTYORE FFNJE I
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MIN
Ifl$ IALI.AJICd__fc.61?['IS?NANCE NOTES _
1. REMOVE ANY SED'LMEN' GREATER THAN 12' DEEP. REPAIR
ANY DAMAGE OR UNDERMINLNG IMMEDiAILLY.
2. S10'NE OUTLET TO BE ADDED AT LOW POINTS IN SILT
FENCE. SEE DETAIL
`
3. CONTRACTORS OPTON TO USE AT TCE O? SLOPES" -
'
gplA('ETJ- TO PA4FMENT TO PROTECT PAVED SURFACES. , MII
4. FABRIC SHALL BE INS'ALLEL) ON THE UP51_OPE SSDE # TH'E
H1Rt FT.JJ7NG.
1
TEVIPORARY SEDIMENT FENCE DETAIL
1 'V C gi'.ALE.
CONSTRUC'IDN SPPriPirA Wkl
MATERIALS:
t USE A SYNTHETIC FlL TFR FABRIC OF
AT LEAST 95% BY WEIGHT OF
POLYDLEF'.NS OR POLYESTER, Yfr1CH IS
CERTF,ED BY THE MANUFACTURER OR
SUPPLIER AS CONFORMING TO THE
REQUIREMENTS IN ASTM D 6461.
SYNTHETIC -FILTER FABR.C SHOGID
CONTAIN ULTRAVIOLET RAY INHIBITORS
AND STABILIZER, TO PROVIDE A
MINIMUM OF B MONTHS OF EXPECTED
USABLE CONSIRUCIION LIFT AT A
TEMPERATURE RANGE O> 0 0 120' ?.
2. INSURE THAT POSTS FOR SEDMENT
FTNCES ARE .3 LB/ INEAR FT
STEFL PITH A MINIIAJM SNGTH DE 5
FEE'. MAKI SURE THAT STEEL POSTS
HAVE PR.QCC"DONS TO FACILITATE
FASTENING 1HE FABRIC
3 FOR REINFORCEUENT Or STANDARD
STRENGTH FIUTLR E ABRIC. USE 'MRE
FENCE MTH A MINIMUM 14 GAUGE
AND A MAXIMUM MESH SPACING OF Q
INCHES.
sDIxSTRUCTION 5PECIFlCATION
MATERIALS
1. CLEAR THE ENTRANCE AND
EKT AREA OF ALL
VEGETATION, ROOTS, AND
OTHER OBJECTIONA.B''..E
MATERIAL AND PROPERLr
GRADE IT.
REVISI?'J
r I I r or{?
PI Ara ?, F.IVAIl'f If?'E6 DY CJ V,,,L.a
PL. LH,PNlr ',n 1L OHS'15Pi E9T
sEAI ARF IMJT TO AHRITIC':NAI RHI '.NI_;
DESI,7{Av-% LV19CU O'BI _:l_ 2IZL'_ ON
PONES 1 AN_ -,
2. PLACE THE 3' COARSE
AGGREGA F TO 'FHE SPECIFIC
GRADE AND DIMENSIONS 5E r ?
}?
SHOWN ON 1HE PLANS, AND n
GO
SMOOTH 1- ;i
Pw
. r
tT' r?a4s.=Yys r,..
3 PROVIDE DRAINAGE TO
CARRY WATER TO A
SEDIMENT iRAO 0R OTHER I NJi V%j
SUITABLE OUTLET. V N Art TI IN1 N uTENTO rrE ENT
/ IU n -IIMFNI FI 1 LEA P THE ON 1 UL 11-iN
A ..SSE GEOTEXTILE FABR,CS TT 1-1 a Mr F IHf P. NI uBl IN u1 I H
!OT IN I ;.JF
L" 3F ULTUI _hT4 t .' Dr N'_T_'UI FnLirHR IN ALI PS-'E THE t,jTI I F HE
IW DI lEL REH EA L
JTAJ E
iLIJ IP
C
A All F( IN L1- hT.dHFti ! v
Ff ''"ELI LAD .
.
_
IHF,4HF
MITT a,T Ff „ T OF h E.FHON HP, III
F1 ?I JAY:,
TEMPORA
NOT TO S;CAL-
SEQUENCE OF CONSTRUCTION
N'S I STONE
A A
L IL T j
Nr??
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L.--- -- ---I'
PLAN
-6 STEEL POSTS ITYP I
J- WIPE MESH- 23 GAGE.,
.
Jf IM' OPENINGS
( LXUAVATE FOP
SEDWM N-CAPTURE,
N+ A
- `?? -_- It { N
' 1,1 2
FI_TERED NOTE:
WATER FRAM ES AND GRATES TO REMAIN
SECTION A A; OFFIN=STRUfTUREGWHILE
INLET PROTECTION IS IN PLACE.
TEMPORARY INLET PROTECTION DETAIL
NOT iOSCALE
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AhD 1 41. A,,-
2 IP IULEA r :N4 T-111 TILL "'JFERLN C*1 IITI NCR ALL NTF) TOR9 C.
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.
'S1AL. CC PI T-LICTIl4, `_ J'AI+_; A`iC "'-IrE.!C -T HEL.-ATON 'FOVF;CNTH-.
-R L1J:J (aJT IL F.1aH5. ALL-H:. 12N At,:) .,ECIt'_NITr.TIGN I.N_ROL t-ALRFE, S 1ALL BE
INSA_LED FPInHID i LANE`NS`JRF!IpJ,-AUTIV Tl'. Tilft ??HR"is g,iAlI R'-N1AlI,lN%A-1
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SEEDING SCHEDULE
PROJECT LOCATION DESCRIPTION-
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PERMANENT SEED MIX
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