20080121 Ver 1_Stormwater Info_20080211

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FEB 1 1 2008
To NCDENR- DIVISION OF WATER QUALITY_ pENR-WATER
512 N. Salisbury St.
Raleigh, NC 27604
DATE 2/S/OS IJOB NO. -2870
ATTENTION Annette Lucas
RE: Ridge Road Middle School
StormwaferApplication Package
WE ARE SENDING YOU ^~ Attached
^ Shop drawings ^ Prints
^ Copy of letter ^ Change order
^ Under separate cover via
^Q Plans ^ Samples
COPIES DATE NO. DESCRIPTION
1 2/8/08 STORMWATER APPLICATION AND MAINTENANCE AGREEMENT
3 2/8/08 CONSTRUCTION DRAWINGS
3 2/8/08 WETLANDS DELINEATION SURVEY MAP (IN PLAN SETJ
2 2/8/08 STORM 8 DETENTION CALCULATIONS W/ DRAINAGE AREA MAPS
2 2/8/08 WET BASIN SUPPLEMENT
1 2/8/08 CHECK FOR $505
i ntat Hrct I IWivaml I I to as cnecKea oelow:
^~ For approval ^ Approved as submitted ^ Resubmit copies for approval
^ For your use ^ Approved as noted ^ Submit copies for distribution
^ As requested ^ Returned for corrections ^ Return corrected prints
^ For review and comment a_____ _ __ __ __ __
REMARKS
PLEASE LET ME KNOW IF YOU HAVE ANY QUESTIONS OR NEED ANY ADDITIONAL INFORMATION.
TIME IS CRITICAL FOR THIS PROJECT SO PLEASE LET ME KNOW /F THERE IS ANYTHING
1 CAN DO TO HELP FACILIATE THIS REVIEW!
SIiE
SOLUTIONS
2 3 2 0
W. Morehead Street
Charlotte, NC 28208
P 704.521.9880 F 704.521.8955
vwvw. sitesol utionsaa.cam
the following items:
^ Specifications
FEDEX
COPY TO FILE sIGNED: JEFF WEHLING

DWQ USE ONLY
Date Received Fee Paid Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
o ~~~~~~ p
I. GENERAL INFORMATION
FEB 1 1 2008
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): p~ _ ~AfATER{]t1H11T1'
CHARLOTTE MECKLENBURG BOARD OF EDUCATION YMETI~ ~ ~OR~NAT£R
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Anthony Ansaldo -Director of Architecture
3. Mailing Address for person listed in item 2 above:
3301 Stafford Drive
City: Charlotte State: North Carolina Zip: 28208
Phone: (980 ) 343-6894 Fax: (980 ) 343-5241
Email: tonv.ansaldoQcros.Kl2.nc.us
4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
RIDGE ROAD MIDDLE SCHOOL
5. Location of Project (street address):
7260 Highland Creek Parkway
City: Charlotte, North Carolina County:Mecklenburg
6. Directions to project (from nearest major intersection):
Exit I-85 at exit 45. Go East on Mallard Creek Church Road approx. 1.5 miles. Turn right (north) on Mallard
Creek Road , go approx. 1.8 miles to Ridge Road. Turn left (east) on Ridge Road go 1.3 miles to site(on rightL
7. Latitude:35-22-36.8 North Longitude:80-45-43.6 West of project
8. Contact person who can answer questions about the project:
Name:Anthony Ansaldo Telephone Number: (980 ) 343-6894
Email: tony.ansaldoQcros.Kl2.nc.us
II. PERMIT INFORMATION:
Form SWU-101 Version 8.07 Page 1 of 4

1. Specify whether project is (check one): ®New ^Renewal ^Modification
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
®Low Density ^High Density ^Redevelop ^General Permit ^Universal SMP ^Other
4. Additional Project Requirements (check applicable blanks):
^CAMA Major ®Sedimentation/Erosion Control ®404/401 Permit ^NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project .
This project will convert (2 existing dr~ponds into ~1) wet detention pond C to handle both Highland Creek
Elementary School and Ridge Road Middle School drainage. This wet pond C will provide 85% TSS and detains
the 2 yr. & 10 yr. storm events to Pre-Q. The Control Structure will be used for the 50 yr. emergency spillwa~_
2. Stormwater runoff from this project drains to the ROCKY River basin.
3. Total Site Area: 51.70 acres 4. Total Wetlands Area: 2.38 (remain) acres
5. 100' Wide Strip of Wetland Area: N/A acres (not applicable if no wetlands exist on site)
6. Total Project Area**: 51.70 acres 7. Project Built Upon Area: 24
8. How many drainage areas does the project have? 5
9. 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.
Basin Information POST Drainage Area pyF.,R,au. POST Drainage Area J
Receiving Stream Name Rocky River Stony Creek
Stream Class & Index No. C C
Drainage Area (sf) 1,834,473 69,261
Existing Impervious* Area (sf) 57,934 0
Proposed Impervious*Area (sf) 678,664 0
Impervious* Area (total) 34 % 0
Impervious* Surface Area POST' Drainage Area ~VERA~t,c. Drainage Area I
On-site Buildings (sf) 234,189 0
On-site Streets (sf) 37,258 0
On-site Parking (sf) 257,047 0
On-site Sidewalks (sf) 138,278 0
Other on-site (sf) 11,892 (mobile trailers) 0
Off-site (sf) 0 0
Total (sf): 678,664 0
`Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 8.07 Page 2 of4

Basin Information pagT Drainage Area 2 pow ,Drainage Area ;
Receiving Stream Name Stony Creek Stony Creek
Stream Class & Index No. C 13-17-5-5 C 13-17-5-5
Drainage Area (sf) 202,554 61,419
Existing Impervious* Area (sf) 2,890 2,008
Proposed Impervious*Area (sf) 10,019 0
Impervious* Area (total) 5 % 0
Impervious* Surface Area Po~c- Drainage Area :2 port- ;Drainage Area
On-site Buildings (sf) 0 0
On-site Streets (sf) p 0
On-site Parking (sf) 0 0
On-site Sidewalks (sf) 10,019 0
Other on-site (sf) 0 0
Off-site (sf) 0 0
Total (sf): 10,019 0
" Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation.
Basin Information Drainage Area'~INn~ra~~Ep :Drainage Area 2
Receiving Stream Name Rocky River
Stream Class & Index No. C 13-17-3
Drainage Area (sf) 111,514
Existing Impervious* Area (sf) 0
Proposed Impervious*Area (sf) 0
Impervious* Area (total) 0
Impervious'`Surface Area Drainage Area ~,t~rl~t-~t,~~N~p Drainage,Area 2
On-site Buildings (sf) p
On-site Streets (sf) p
On-site Parking (sf) 0
On-site Sidewalks (sf) p
Other on-site (sf) 0
Off-site (sf) 0
Total (sf):
* 0
Impervious area is defined as the built icpon area including, but not limited to, bicildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated based on the current poling regarding inclusion of wetlands in the built upon area
percentage calciclation.
Form SWU-101 Version 8.07 Page 2 of4

**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation.
10. How was the off-site impervious area listed above derived? No offsite drainage
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following deed restrictions and protective covenants are required to be recorded for all subdivisions,
outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot
number, size and the allowable built-upon area for each lot must be provided as an attachment.
Form DRPC-1 High Density Commercial Subdivisions
Form DRPC-2 High Density Developments with Outparcels
Form DRPC-3 High Density Residential Subdivisions
Form DRPC-4 Low Density Commercial Subdivisions
Form DRPC-5 Low Density Residential Subdivisions
Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, that the covenants will be binding
on all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the
sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the stormwater and General Permits Unit at [phone] for the status
and availability of these forms.
Form SW401-Low Density
Form SW401-Curb Outlet System
Form SW401-Off-Site System
Form SW401-Wet Detention Basin
Form SW401-Infiltration Basin
Form SW401-Infiltration Trench
Form SW401-Bioretention Cell
Form SW401-Level Spreader
Form SW401-Wetland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Low Density Supplement
Curb Outlet System Supplement
Off-Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Form SWU-101 Version 8.07 Page 3 of 4

VI. SUBMITTAL REQUIREMENTS
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 appropriate DWQ Office. (Appropriate office may be found by locating project on the
interactive online map at htt~://h2o.enr.state.nc.us/su/msi_maps.htm)
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
• Original and one copy of the stormwater Management Permit Application Form
• Original and one copy of the Deed Restrictions & Protective Covenants Form
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP
• Permit application processing fee of $505 ($4,000 for Express) payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/management
Initi s
• Copy of any applicable soil report
• Three copies of plans and specifications (sealed, signed & dated), including:
- Development/Project name
- Engineer and firm
- Legend
- North arrow
-Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
-Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
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.
Designated agent (individual or firm): Anthon~Ansaldo
Mailing Address: 3301 Stafford Drive
City: Charlotte
State: North Carolina Zip:28208
Phone: (980 ) 343-6894 Fax: (980 ) 343-5241
Email:tony. [e-mail]
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2)
certify that the information included on this permit 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 will be recorded, anyl'that the proposed project complies with the requirements of 15A
NCAC 2H .1000. //!
Signature:
Date: l
Form SWU-101 Version 8.07 Page 4 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
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):
® does ^ does not incorporate a vegetated filter at the outlet.
This system (check one):
^ does ®does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimised to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of inspection and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire BMP Trash/ debris is resent. Remove the trash/ debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer a lication.
Vegetation is too short or too Maintain vegetation at a height of
lon a roximatel six inches.
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential roblem: How I will remediate the roblem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise dama ed.
Erosion is occurring in the Regrade the Swale if necessary to
Swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future roblems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
revent future erosion roblems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the lants rather than s ra in .
The vegetated shelf Best professional practices Prune according to best professional
show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide aone-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessa
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the lants rather than s ra in .
The main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the al al owth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential roblem: How I will remediate the roblem:
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs re air.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is dama ed Re air or re lace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 401 Oversight Unit at 919-733-
1786.
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 709.62 feet in the main pond, the
sediment shall be removed.
When the permanent pool depth reads 710.37 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
X11 in the blanks)
Permanent Pool Elevation 714.50
Sediment Removal .710.37 Pe anen Pool
----------------- Volume Sediment Removal Elevation 709.62 Volume
Bottom Elevatio 709 -ft Min. ---------------------------------------------- ---'--
Sediment Bottom Elevation 708 1-ft n
Storage Sedimer
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
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.
Project name: RIDGE ROAD MIDDLE SCHOOL
BMP drainage area number: POST-DEV. AREA OVERALL
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, ~ tea" ~~ ~-~ ~ ,~ ~ ~-~ ~ , a Notary Public for the State of
~'/,~ ~~~~. ,~ ,.~ , County of ~~,.-~ z~ , do hereby certify that
ti ~~ ~ ,~ sue- c~; personally appeared before me this 3/
day of , 2cZ ~r ,and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
,~~ ~ ~ ~ annu ^n ~ r ~ r -~r~~r,'s
!`~i`P-APR~ C`~A~~r.
l`~: '•
o rq ' .~~
'N
• ~D
CIC ;~ ;
.~ ~~
ii~s~~C3~, ~ _ , ~``~~
SEAL
My commission expires ~/~C %~'~ ~ z5 :, Z u i /
Form SW441-Wet Detention Basin I&M-Rev.2
Print name: Anthony Ansaldo

~. Permit No.
(to be provided by DWQ)
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part lll) must be printed, filled out and submitted along with all of the required information.
O~~~F LNATfsp~
r7i ~
G -c'
'I. PROJECT 1NFdRMATION
Project name RIDGE ROAD MIDDLE SCHOOL
Contact person Anthony Ansaldo
Phone number (980) 343 - 6894
Date 31,1an-08
Drainage area number
Post-Dev. Area Overall
It. C?EStGN iNF(}RA~tTlON
Site Characteristics
Drainage area 1,834,312 ft
Impervious area 678,665 ftz
impervious 36.99834052
Design rainfall depth 1.0 in
Storage Volume: Non-SR Waters
Minimum volume required 58,519 ft3
Volume provided 58,756 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
Is pre/post control of the 1-yr 24-hr peak flow required? N (Y or N)
1-yr, 24-hr rainfall depth in
Rational C, pre-development (unitless)
Rational C, post-development (unitless)
Rainfall intensity: l-yr, 24-hr storm in/hr
Pre-development 1-yr, 24-hr peak flow ft3lsec
Post-development 1-yr, 24-hr peak flow ft3lsec
PrelPost 1-yr, 24-hr peak flow control ft3lsec
Basin Elevations
Basin bottom elevation 708.00 ft
Sediment cleanout elevation 709.62 ft
Bottom of shelf elevation 714.00 ft
Permanent pool elevation 714.50 ft
Top of shelf elevation 715.00 ft
Temporary pool elevation 716.00 ft
Volume and Surface Area Calculations
SAIDA ratio 1.63 (unitless)
Surface area at the bottom of shelf 16584.00 ft
Volume at the bottom of shelf 23618.00 ft3
Permanent pool, surface area required 29,917 ftz
Permanent pool, surface area provided 31,797 {~
Permanent pool volume 110,653 ft3
Average depth for SAIDA tables 3.479982388 ft
Surface area at the top of shelf 36,031 f}3
Volume at the top of shelf 32,501 ft3
OK
OK
Fonn SW401-Wet Detention Basin-Rev.3 Parts I. 8 II. Design Summary, Page 1 of 2

• Permit No.
(to be provided by DWQ)
II. t)ESiGN INFORMATION
Forebay volume 34,214 ft'
Forebay % of permanent pool volume 31 % hAust be apprcx. 2~°~a, Adjust peed dimensions
Temporary pool, surface area provided 37,182 ftz
Drawdown Calculations
Treatment volume drawdown time 2.8 days OK
Treatment volume discharge rate 0.29 ft3/s
Pre-development 1-yr, 24-hr discharge N/A ft3/s OK
Post-development 1-yr, 24-hr discharge N/A ft3/s CK
Additional Information
Diameter of orifice 3.00 in
Design TSS removal 85
Basin side slopes 3 :1 JK
Vegetated shelf slope 10 :1 OK
Vegetated shelf width 10 ft OK
Length of flowpath to width ratio 3.2 :1 OK
Length to width ratio 3.6 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 2.5 ft OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? Y (Y or N) OK
Capures all runoff at ultimate build-out? Y (Y or N) dK
Drain mechanism for maintenance or emergencies PUMP
Forth SW401-Wet Detention Basin-Rev.3 Parts I. & II. Design Summary, Page 2 of 2

Permit
(to be provided by DWQ)
llE. REQUtREl3 ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
~~~' j' C105 & POST
s~~~~203 & L102

~1r~'`"" C103 & C104
~~~~~~~ Attached
S~~s~~ Attached
~~~,.~[~' Attached
Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
-Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
-Basin dimensions,
-Pretreatment system,
-High flow bypass system,
-Maintenance access,
- Recorded drainage easement and public right of way (ROIIV),
- Overflow device, and
- Boundaries of drainage easement.
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
-Outlet structure with trash rack or similar,
-Maintenance access,
-Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
-Basin cross-section,
-Vegetation specification for planting shelf, and
-Filter strip.
C203 3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
-Inlet and outlet structures.
4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
C106
Attached
C108
7. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
8. The supporting calculations.
9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
10, A copy of the deed restriction.
Form SW401-Wet Detention Basin-Rev.1 Part III. Required Items Checklist, Page 1 of 1