20080420 Ver 2_Sediment and Erosion Control Plan_20080905

0O-a??oVa,
Stormwater Management Calculations
for:
Wynne Creek
Residential Development
Old Buies Creek Road
Angier, North Carolina
Prepared by:
SLAM TODD d'AMBROSI
URBAN PLANNING /LANDSCAPE ARCHITECTURE
2601 WESTON PARKWAY • SUITE 203 • CARY, NORTH CAROLINA • 27513 USA
(OFFICE) 1.919.678.1071 (FAX) 1 .919.6 7 8.12 9 0
' (INTERNET) www.etdpa.com (EMAIL) [e-mail]
r-?g r r, ( ? 7 f `
August 18, 2007
' S E P 2008
DEtjR - VVAI ER. 00At;'{v
1NE1LX,'DS 00 S"CRMI !! JER R4tRhli:ii
TABLE OF CONTENTS
1) Project Summary
' 2) Impervious Calculations
3) Wet Detention Pond 1 - Exhibits and Calculations
4) Wet Detention Pond 2 - Exhibits and Calculations
' 5) Future Wet Detention Ponds - Exhibits and Calculations
' 6) Details
ELAN. TODD drAMBROSI
URBAN PLANNING / LANDSCAPE ARCHITECTURE
CIVIL ENGINEERING,/ GEOGRAPHIC INFORMATION SYSTEMS
' Storm Drainage Summary
For
Wynne Creek Phases 1 and 2
This project is a 147.4 acre residential subdivision located off of Old Buies Creek
' Road (SR 1542). The property is located south of the Town of Angier in Harnett
County. The current layout for the project calls for 95 single family residential units
and 1 recreation area. The previously approved pdd allows for a mix of single family
' and multi-family residences, not to exceed 343 total units. The storm drainage design
for this submittal is only for the 95 residential units and recreation area but takes into
' account future expansion of the site.
Included with this packet are two exhibits showing the current and future drainage
boundaries, please refer to these as you read through this summary.
Drainage Areas 1 and 2 are high density drainage areas and both utilize wet detention
' ponds to treat the runoff. Impervious calculations for the current proposed layouts as
well as the possible future layout have been included in this booklet. Both drainage
areas also have a section of calculations in the booklet including an exhibit, the wet
detention basin supplement, sizing calculation, a stage storage chart, the level
spreader supplement and operation and maintenance agreements. Common details
for both ponds are included at the end of the booklet such as construction sequence,
' section views of the basins and level spreaders and example littoral shelf planting
plans.
' Wet ponds 1 and 2 will treat and detain the stormwater from phases 1 and 2 of the
project. Wet pond 1 is sized to treat the entire phase 1 area and will be constructed
with phase 1. Wet pond 2 will similarly be constructed with phase 2. Both ponds are
' released to a level spreader. The ponds are sized to provide 90% TSS removal so
filter strips will not be necessary. Both ponds provide an average depth of greater
than 3 feet and include an additional foot of sediment storage and a littoral shelf. Rip
' rap berms will separate out the forebay and provide for a 3:1 minimum flow length.
The pre and post requirements for both drainage areas will be met.
' Future drainage areas 1, 2, and 3 are currently low density but in the future might be
high density. An approved PDD allows for a total of 343 units on the property.
However no further design work or local approvals have been completed.
' Calculations showing the current proposed impervious percentages and the possible
future impervious percentages have been included in this booklet. In addition
preliminary sizing calculations` have been done for each future drainage area and pond
i locations are shown on the future drainage areas exhibit.
1
Impervious, Calculations
Current Proposed Impervious Calculations
Drainage Area 1
Public Streets Entrance Road 629 LF 36' WIDE 22,644 SF
Public Streets Residential 3,651 LF 27' WIDE 98,564 SF
Sidewalks 6,086 LF 5' WIDE 30,430 SF
Phase 1 lots 35 LOTS 1800 SF/LOT 63,000 SF
Alleys 1,613.0 LF 16' WIDE 25,808 SF
Greenway 1,630 LF 5' WIDE 13,074 SF
Total Impervious Area
Total Area
-Impervious Percentage 253,520 SF
598,885 SF
42.33%
Drainage Area 2
Public Streets Residential 2,288 LF 27' WIDE 61,776 SF
Sidewalks 4,358 LF 5' WIDE 21,790 SF
Phase 1 lots 31 LOTS 1800 SF/LOT 55,800 SF
Alleys 317.0 LF 16' WIDE 5,072 SF
Total Impervious Area
Total Area
Impervious Percentage 144,438 SF
566,694 SF
25.49%
Future Drainage Area 1
Public Streets Entrance Road 1,307 LF 36' WIDE 47,052 SF
Rec Center Parkin 12,663 SF
Total Impervious Area
Total Area
Impervious Percentage 59,715 SF
789,307 SF
7.57%
I Future Drainage Area 2 1
Total Impervious Area 0 SF
Total Area 420,790 SF
Impervious Percentage 0.00%
Future Drainage Area 3
Total Impervious Area 0 SF
Total Area 250,470 SF
Impervious Percentage 0.00%
Future Proposed Impervious Calculations
Drainage Area 1
Public Streets Entrance Road 629 LF 36' WIDE 22,644 SF
Public Streets Residential 3,651 LF 27' WIDE 98,564 SF
Sidewalks 6,086 LF 5' WIDE 30,430 SF
Phase 1 lots 35 LOTS 1800 SF/LOT 63,000 SF
Townhome Building and Streets 29,084 SF
Alleys 1,613.0 LF 16' WIDE 25,808 SF
Greenway 1,630 LF 5' WIDE 13,074 SF
Total Impervious Area
Total Area
Impervious Percentage 282,604 SF
598,885 SF
47.19%
Drainage Area 2
Public Streets Residential 2,288 LF 27' WIDE 61,776 SF
Sidewalks 4,358 LF 5' WIDE 21,790 SF
Phase 1 lots 31 LOTS 1800 SF/LOT 55,800 SF
Townhome Building and Streets 83,144 SF
Alleys 317.0 LF 16' WIDE 5,072 SF
Total Impervious Area
Total Area
.Impervious Percentage 227,582 SF
566,694 SF
40.16%
Future Draina ge Area 1
Public Streets Entrance Road 1,307 LF 36' WIDE 47,052 SF
Public Streets Residential 2,174 LF 27' WIDE 58,698 SF
Sidewalks 6,962 LF 5' WIDE 34,810 SF
Phase 2 lots 35 LOTS 2400 SF/LOT 84,000 SF
Townhome Building and Streets 16,250 SF
Rec Center Parkin 12,663 SF
Total Impervious Area
Total Area
-Impervious Percentage 253,473 SF
789,307 SF
32.11%.
Future Draina ge Area 2
Public Streets Residential 1,482 LF 27' WIDE 40,014 SF
Sidewalks 2,964 LF 5' WIDE 14,820 SF
Phase 3 lots 26 LOTS 2400 SF/LOT 62,400 SF
Townhome Building and Streets 16,250 SF
Total Impervious Area
Total Area
Impervious Percentage 133,484 SF
420,790 SF
31.72%
Future Draina ge Area 3
Public Streets Residential 805 LF 27' WIDE 21,735 SF
Sidewalks 1,610 LF 5' WIDE 8,050 SF
Phase 3 lots 14 LOTS 2400 SF/LOT 33,600 SF
Townhome Building and Streets 44,844 SF
Total Impervious Area
Total Area
Impervious Percentage 108,229 SF
250,470 SF
43.21%

1
1
1
1
1
1
1
11

Wet Detention Pond 1
Exhibits and Calculations
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Permit
A&w*VA
NCDENR
(to be provided by DWQ)
W A?TF9QG
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 111) must be printed, filled out and submitted along with all of the required information.
.11*4r4w Y
I. PROJECT INFORMATION
"?ynne Creek
Project name
Contact person Susan Hobbs
Phone number 919A81-2021
Date 6/17/2008
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area 598,885.00 ft
Impervious area 282,604.00 ft2
% impervious 47.19 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 23,691.00 ft3
Volume provided 78,841.00 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
1-yr, 24-hr rainfall depth 3.00 in
Rational C, pre-development 0.25 (unitless)
Rational C, post-development 0.58 (unitless)
Rainfall intensity: I-yr, 24-hr storm 0.13 in/hr
Pre-development 1-yr, 24-hr peak flow 10.31 ft3/sec
Post-development 1-yr, 24-hr peak flow 0.19 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control -10.12 ft3/sec
Basin Elevations
Basin bottom elevation 222.00 ft
Sediment cleanout elevation 223.00 ft
Bottom of shelf elevation 226.30 ft
Permanent pool elevation 226.80 ft
SHWT elevation ft
Top of shelf elevation 227.30 ft
Temporary pool elevation 229.00 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 9
Permit
(to be provided by DWQ)
II. DESIGN INFORMATION
Volume and Surface Area Calculations
SA/DA ratio 2.85 (unitless)
Surface area at the bottom of shelf 19,120.00 ft2
Volume at the bottom of shelf 55,24025 ft3
Permanent pool, surface area required 17,068.22 ft2
Permanent pool, surface area provided 21,794.00 ftZ OK
Permanent pool volume 65,468.75 ft3
Average depth for SA/DA tables 3.00 ft OK
Surface area at the top of shelf 24,625.00 ftZ
Volume at the top of shelf 77,073.50 ft3
Forebay volume 11,828.00 ft3
Forebay % of permanent pool volume 18.07 % OK
Temporary pool, surface area provided 27,675.00 ftZ
Drawdown Calculations
Treatment volume drawdown time 2.67 days OK
Treatment volume discharge rate 0.19 ft3/s
Pre-development 1-yr, 24-hr discharge 10.31 ft3/s OK
Post-development 1-yr, 24-hr discharge 0.19 ft3/s OK
Additional Information
Diameter of orifice 3 in
Design TSS removal 90 %
Basin side slopes 3.00 :1 OK
Vegetated shelf slope 10.00 :1 OK
Vegetated shelf width 10.00 It OK
Length of flowpath to width ratio 3.06 :1 OK
Length to width ratio 1.55 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 1.00 It OK
Vegetated filter provided? N (Y or N) Design must be based on 90% TSS removal
Recorded drainage easement provided? Y (Y or N) OK
Capures all runoff at ultimate build-out? y (Y or N) OK
Drain mechanism for maintenance or emergencies 6' gate valve
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 9
Permit No.
(to be provided by DWQ)
III. RE HIRED 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.
6:_ C -? ( 1. 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,
' - Proposed drainage easement and public right of way (ROM,
- Overflow device, and
- Boundaries of drainage easement.
n h ?' 2 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.
h g 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.
?' bB 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.
ng 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations.
SCJ" 3 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
' N A 9. A copy of the deed restrictions (if required).
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
' soil maps are not an acceptable source of soils information.

' Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 3 of 9
E L A 7[ T O D D D, A 7[ B R O Sir By: BMH
1-?xc[?rncTUBE.=T?rc zgrG?.GIS Date: 6/17/2008
NONVIN PLAmimio LAND scAPE
2601 WES Tom PKWY, STE 203, CAirt NC 27513
www_etdpa_cOm (o) 919.678.10-71 (F) 919.678.1290 Revised:
Wet Detention Basin #1 Design
Wynne Creek
Type of Impervious Landcover Area (acres)
Total Impervious Landcover: 6.49
Total Drainage Area (DA): 13.75
Percent of Impervious in Drainage Area (1), 47.19
Calculate the required storage volume (Rv
for the 1" first flush storm event:
Rv = 0.05 + (0.009) * I
Where I = Percent of impervious from above.
Rv = 0.47
Calculate the required drainage volume
from the 1" storm to be controlled:
Volume = (design rainfall)(Rv)(Drainage Aarea)
V=1"(1/12) * Rv (1/12)(D)
V= 23,691 cubic feet
Calculate the required permanent pool
surface area ratios SA / DA (see Table 1.1 in NCDENR Guide):
I = 47.19
ratio @ 3.00 feet 2.85 percent
area @ 3.00 feet 17,068 square feet OK
Stage Storage
INC. VOL. TOT. VOL
3 29545 SF 28610 144310.5
2 27675SF 13384 115700.5
1 25861SF 25243 102316.5
+.5 (TS) 24625 SF 11604.75 77073.5
NWSE 21794 SF 10228.5 65468.75
-.5 (13S) 19120 SF 5666.25 55240.25
-0.8 18655 SF 17899 49574
-1.8 17143 SF 16416 31675
-2.8 15689 SF 15259 15259
-3.8 14829 SF 13887.5 0
-4.8 12946 SEDIMENT
TEMP POOL VOLUME 78841.75
PERM POOL VOLUME 65468.75
PERM POOL SA 21794
AVERAGE DEPTH 3.00398
NWSE 4842 SF
-0.8 3663 SF
-1.8 3005 SF
-2.8 2582 SF
-3.8 2015 SF
-4.8 1646
FOREBAY VOL UME
FOREBAY SA
Forebay
INC. VOL. TOT. VOL
3402 11828
3334 8426
2793.5 5092
2298.5 2298.5
1830.5 0
SEDIMENT
11828
4842
o`'o? wnrFROv
r
' NC ENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
' DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)i
1. PROJECT INFORMATION
Project name Wynne Creek
Contact name Susan Hobbs
Phone number 919ABl-2021
Date July 30, 2008
Drainage area number 1
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
'
Type of BMP Wet Detention Pond
Drawdown flow from the BMP 1.14 cfs
' For Level Spreaders Receiving Flow from the Drainage Area Do not complete this section of the worksheet.
Drainage area ffZ Do not complete this section of the worksheet.
Impervious surface area It, Do not complete this section of the worksheet.
Percent impervious % Do not complete this section of the worksheet.
'
Rational C coefficient Do not complete this section of the worksheet.
Peak flow from the 1 in/hr storm cfs Do not complete this section of the worksheet.
Time of concentration min
' Rainfall intensity, 10-yr storm in/hr Do not complete this section of the worksheet.
Peak flow from the 10-yr storm cfs Do not complete this section of the worksheet.
' Where Does the Level Spreader Discharge ?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? Y (Y or N) Please complete filter strip characterization below.
To a filter strip or riparian buffer? N (Y or N)
Other (specify)
' Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
' Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
' Slope (from level lip to to top of bank)
Are any draws present?
4.00 ft
0.00 ft
0.00 It
4.00 ft
222.30 fmsl
222.10 fmsl
5.00 % OK
N (Y or N) OK
Level Spreader Design
' Forebay surface area _
Feet of level lip needed per cfs _
Answer "Y" to one of the following:
' Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow _
' Is a bypass device provided?
' Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5
sq ft No forebay is needed.
13 ft/cfs
N (Y or N)
Y (Y or N)
Y (Y or N)
1.14 cfs
N (Y or N) A bypass device is not needed.
Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
20.00 ft
N (Y or N)
#VALUE!
(Y or N) Do not complete this section of the worksheet.
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cfs Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
? W
------------
M
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M
B

I
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
Jill. REQUIRED ITEMS CHECKLIST

C

n

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.
h `° 1 1. 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),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROM, and
- Boundaries of drainage easement.
- am- 1? - 02 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
W/A 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
o $ 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
6. The supporting calculations.
3 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
/'/A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Permit Number:
' (to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation 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 minimized 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 operation 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 problem: How I will remediate the problem:
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 application.
Vegetation is too short or too Maintain vegetation at a height of
long. approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 1 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
J

BMP element: Potential problem: How I will remediate the problem:
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 damaged.
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
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
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 a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than s ra '
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 algal growth.
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
O&M-Rev.3
Page 2 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: 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 repair.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged Repair or replace 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 1 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 1 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 226.8
Sediment Removal t.223.0 Pe anen
-------- Volume
Bottom Eleva-ft min.
Sediment
Storage
FOREBAY
Form SW401-Wet Detention Basin O&M-Rev.3
Pool
- - - - - Sediment Removal Elevation 223.0- - - - - - - - - -? Volume
Bottom Elevation 222.0 2 1-ft Mon
Sedimei
Storage
MAIN POND
Page 3 of 4
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:Wynne Creek
BMP drainage area number:

Print name: %5NAUX V 6 C- )? a OgOCIF '
Title: 1 \AJ- M.b u AA A&01-Cc
L_
Address: Rk (j 0
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I' ^ a Notary Public for the State of
A? A
County o
, do hereby certify that
pers ally appeared before me this 1-11AA
day of 40 and acknowledge the due execution of the
forgoing ;wet V!in basmaintenance requirements. Witness my hand and official
seal,
COMMONWEALTH OF PENNSYLVANIA
Notarial Seat
Diana Zajac, Notary Public
Lower Merion Twp., Montgomery County
My Commission Expires Oct. 23, 2010
Member, Pennsylvania Association of Notaries
SEAL
My commission expires A91W110
Form SW401-Wet Detention Basin O&M-Rev.3
Page 4 of 4
Date: `U), b%
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation 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.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).,
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/ debris.
system
The flow splitter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) clo ed. of an sediment off-site.
The flow sputter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo a of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if a licable . a roximatel three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
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 application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying- problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
' Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
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: Wynne Creek
BMP drainage area number:I
Print name: SA+V% D E L IN E M !Corr
Title:
L
' 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.
a Notary Public for the State of
Or of /? do hereby certify that
le? j ????Ze? personally appeared before me this
day of D4d', and acknowledge the due execution of the
' forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
COMMONWEALTH OF PENNSYLVANIA
Notarial Seal
na Zajac, Notary Public
Lrton Twp,, Montgomery County
mission Exp
ires Oct. 23, 2010
Member, Pennsylvania Association of Notaries
SEAL
My commission expires 1,41°2? //6
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Date:
Wet Detention Pond 2
Exhibits and Calculations
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' Permit No.
(to be provided by DWQ)
l?
l?r ^? of warF9
o? 4G
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 111) must be printed, filled out and submitted along with all of the required information.
1. PROJECT INFORMATION
Project name Wynne creek
Contact person Susan Hobbs
Phone number 919A81-2021
Date 6/17/2008
Drainage area number 2
II. DESIGN INFORMATION
Site Characteristics
'
Drainage area 566,694.00 ft2
Impervious area 227,582.00 ftz
% impervious 40.16 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 19,429.88 ft'
t Volume provided 34,937.00 ft'
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff It,
'
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft'
Volume provided ft'
' Peak Flow Calculations
1-yr, 24-hr rainfall depth 3.00 in
Rational C, pre-development 0.25 (unitless) -
' Rational C, post-development 0.53 (unitless)
Rainfall intensity:1-yr, 24-hr storm 0.13 in/hr
Pre-development 1-yr, 24-hr peak flow 9.76 ft3/sec
Post-development 1-yr, 24-hr peak flow 0.10 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control -9.66 ft'/sec
Basin Elevations
Basin bottom elevation 223.50 ft
' Sediment cleanout elevation 224.50 ft
Bottom of shelf elevation 228.50 It
Permanent pool elevation 229.00 It
SHWT elevation ft
'
Top of shelf elevation 229.50 It
Temporary pool elevation 230.00 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 6
Permit No.
(to be provided by DWQ)
II. DESIGN INFORMATION
Volume and Surface Area Calculations
SA/DA ratio 2.14 (unitless)
Surface area at the bottom of shelf 12,299.00
Volume at the bottom of shelf 39,486.50 fta
Permanent pool, surface area required 14,167.35 ftZ
Permanent pool, surface area provided 14,529.00 ft OK
Permanent pool volume 46,193.50 ft3
Average depth for SA/DA tables 3.18 ft OK
Surface area at the top of shelf 16,916.00 ft2
Volume at the top of shelf 54,054.75 ft3
Forebay volume 8,373.00 ft3
Forebay % of permanent pool volume 18.13 % OK
Temporary pool, surface area provided 17,663.00 ftz
Drawdown Calculations
Treatment volume drawdown time 3.45 days OK
Treatment volume discharge rate 0.10 ft31s
Pre-development 1-yr, 24-hr discharge 9.76 ft3/s OK
Post-development 1-yr, 24-hr discharge 0.10 ft3/s OK
Additional Information
Diameter of orifice 2 in
Design TSS,removal 90 %
Basin side slopes 3.00 :1 OK
Vegetated shelf slope 10.00 :1 OK
Vegetated shelf width 10.00 ft OK
Length of flowpath to width ratio 3.21 :1 OK
Length to width ratio 2.16 :1 OK
Trash rack for overflow & orifice? y (Y or N) OK
Freeboard provided 1.00 It OK
Vegetated filter provided? N (Y or N) Design must be based on 90% TSS removal
Recorded drainage easement provided? y (Y or N) OK
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies 6' gate valve
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 6
Permit No.
(to be provided by DWQ)
III. REQUIRED 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.
Page! Plan
Initials Sheet No.
1. 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,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
13 b3 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.
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. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations.
H s? I? 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required).
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 3 of 6
E L T o n n n A ma B g o s i By: BMH
+I PLANkalM.LANDSCAPE ARcmTECTURE.Fa7czNEmP-wG.GIS Date: 6/17/2008
2601 WESTONPxwsr, STE 203, CARYNC 27513
www_etdpa_cam (o) 919.678.10-71 (F) 919.675.1290 Revised:
Wet Detention Basin #1 Design
Wynne Creek
Type of Impervious Landcover Area (acres)
Total Impervious Landcover: 5.22
Total Drainage Area (DA): 13.01
Percent of Impervious in Drainage Area (1); 40.16
Calculate the required storage volume (Rv
for the 1" first flush storm event:
Rv = 0.05 + (0.009) * I
Where I = Percent of impervious from above.
Rv = 0.41
Calculate the required drainage volume
from the 1" storm to be controlled:
Volume = (design rainfall)(Rv)(Drainage Aarea)
V=1"(1/12) * Rv (1/12)(D)
V= 19,430 cubic feet
Calculate the required permanent pool
surface area ratios SA / DA (see Table 1.1 in NCDENR Guide):
I = 40.16
ratio @ 3.00 feet 2.50 percent
area @ 3.00 feet 14,167 square feet OK
Stage Storage
INC. VOL. TOT. VOL
TOP 19199 18431 81130.5
+1 17663 8644.75 62699.5
+0.5 16916 7861.25 54054.75
NWSE 14529 6707 46193.5
-.5 (BS) 12299 5990 39486.5
-1 11661 11043.5 33496.5
-2 10426 9837 22453
-3 9248 8687.5 12616
4 8127 3928.5 3928.5
4.5 7587 SEDIMENT 0
TEMP POOL VOLUME 34937
PERM POOL VOLUME 46193.5
PERM POOL SA 14529
AVERAGE DEPTH 3.1794
Forebay
FOREBAY INC. VOL. TOT. VOL
NWSE 3323 1522.75 8373.75
-1 2768 2520 6851
-2 2272 2047.5 4331
-3 1823 1620.5 2283.5
-4 1418 663 663
-4.5 1234 SEDIMENT
PERM POOL VOLUME 8373.75
PERM POOL SA 3323
I
?'-^ a?o? WaT ?90?
+ h f
NC ENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RE STORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
1. PROJECT INFORMATION
Project name Wynne Creek
Contact name Susan Hobbs
Phone number 919-481-2021
Date July 30, 2008
' Drainage area number 2
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
' Type of BMP Wet Detention Pond
Drawdown flow from the BMP 7.70 cfs
' For Level Spreaders Receiving Flow from the Drainage Area Do not complete this section of the worksheet.
Drainage area ft, Do not complete this section of the worksheet.
Impervious surface area ftZ Do not complete this section of the worksheet.
Percent impervious % Do not complete this section of the worksheet.
'
Rational C coefficient Do not complete this section of the worksheet.
Peak flow from the 1 in/hr storm cis Do not complete this section of the worksheet.
Time of concentration min
' Rainfall intensity, 10-yr storm in/hr Do not complete this section of the worksheet.
Peak flow from the 10-yr storm ds; Do not complete this section of the worksheet.
Where Does the Level Spreader Discharge ?
'
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? -° Y (Y or N) -
' To a filter strip or riparian buffer? N (Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 5.00 ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width 5.00 ft
Elevation at downslope base of level lip 224.10 fmsl
Elevation at top of bank of the receiving water 224.00 fmsl
Slope (from level lip to to top of bank) 2.00 % OK
Are any draws present? n (Y or N) OK
Level Spreader Design
Forebay surface area sq ft No forebay is needed.
Feet of level lip needed per cfs 13 ft/cfs
Answer 'Y" to one of the following:
Length based on the 1 in/hr storm? N (Y or N)
Length based on the 10-yr storm? Y (Y or N)
Length based on the BMP discharge rate? Y (Y or N)
Design flow 7.70 cis
' Is a bypass device provided? N (Y or N) A bypass device is not needed.
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and ll. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
r•
------------
M
104.00 ft
N (Y or N)
#VALUE!
(Y or N) Do not complete this section of the worksheet.
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cfs Do not complete this section of the worksheet
Do not complete this section of the worksheet
------------
M
B
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and It. Design Summary, page 2 of 2

III. REQUIRED 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.
f _ e-- b 1. 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),
' - Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
' - Proposed drainage easement and public right of way (ROM, and
- Boundaries of drainage easement.
H C-d 2. Plan details (1" = 30' or larger) for the level spreader showing:
' - Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
' - Proposed drainage easement, and
- Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
111A 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
H G 'd? 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
(J
h Seck. 6. The supporting calculations.
st A- ? 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
X /A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation 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 minimized 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 operation 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 problem: How I will remediate the problem:
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 application.
Vegetation is too short or too Maintain vegetation at a height of
long. a roximateI six inches.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 1 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
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 damaged.
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 problems 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
-prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on

The vegetated shelf
Best professional practices the plants rather than spraying.
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 a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessarv.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on

The main treatment area
Sediment has accumulated to the plants rather than spraying.
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 algal growth.
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 O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
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 repair.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged Repair or replace 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 1 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 1 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
011 in the blanks)
V Permanent Pool Elevation 229.0
Sediment Removal .225.0 Pe anen Pool
----------------- Volume Sediment Removal Elevation 225.0 Volume
Bottom Elevatio 224.0 -ft Min. --------------------------------------------
Se diment
Bottom Elevation 224.0 1-ft n
Storage Sedimex
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4
Permit Number:
' (to be provided WD WQ)
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: Wynne Creek
BMP drainage area number:2
Print name:- SA VkJ C-L- NENl a a FF
Title: K'LraL.er, N?a?a?trJt t?aKQC Cr?e?t? LLc
Address: P.y , at( 2 Yv - LJ t4-iM4..1.AA P? t To FL
Phone
Signature:
Date: 7 1 3 t (og
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I? , a Notary Public for the State of
y 61
County of do hereby certify that
perso ally appeared before me this 3
ay of DD and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
COMMONWEALTH OF PENNSYLVANIA
Notarial Seal
Diana Zajac, Notary Public
Lower Merton Twp., Montgomery County
My Commission Expires Oct. 23, 2010
Member, Pennsylvania Association of Notaries
SEAL
My commission expires ?? o d
Form SW401-Wet Detention Basin O&M-Rev.3
Page 4 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation 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.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/ debris.
system
The flow sputter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow sputter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downsIo a of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
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 application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
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:Wynne Creek
BMP drainage area number:2
Print name: SAm v E L_
Title: oe VJy V1AlL C? Lck I_.
Address: P.o• loX A'yo, ?..?Ur?w?•,a?c1 ??- l ?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 411 a Notary Public for the State of
V V
County of , do hereby certify that
perso lly appeared before me this
day of DD , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
COMMONWEALTH OF PENNSYLVANIA
Notarial Seal
Diana Zajac, Notary Public
Lower Merton Twp., Montgomery County
Y Commission Expires Oct. 23,20, 0
Member, PennsYlvania Association of Notaries
SEAL
My commission expires o
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Date: '7 &'3
Future Wet Detention Ponds
Exhibits and Calculations
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' 2601 W ST014 PxWY, STIr, 2031 Caazv NC 2`7513
wc?w_etdpa_com (o) 919.678.10-71 (F) 919.6-15.1290
Future Wet Detention Basin #1
' Wynne Creek
Type of Impervious Landcover Area (acres)
' Total Impervious Landcover: 6.99
' Total Drainage Area (DA): 18.12
Percent of Impervious in Drainage Area (1): _ 38.57
' Calculate the required storage volume (Rv)
for the 1" first flush storm event:
Rv = 0.05 + (0.009) * I
Where I = Percent of impervious from above.
' Rv = 0.40
Calculate the required drainage volume
' from the 1" storm to be controlled:
Volume = (design rainfall)(Rv)(Drainage Aarea)
V=1"(1/12) * Rv (1/12)(D)
' V= 26,119 cubic feet
Calculate the required permanent pool surface area ratios SA /
DA (see Table 10-3 in NCDWQ BMP Manual):
' I = 38.57
ratio @ 3 feet 2.41 percent
ratio @ 3.5 feet 2.23 percent
' ratio @ 4 feet 1.96 percent
ratio @ 4.5 feet 1.84 percent
ratio @ 5 feet 1.74 percent
'
area @ 3 feet 19,022 square feet
area @ 3.5 feet 17,602 square feet
' area @ 4 feet 15,470 square feet
area @ 4.5 feet 14,523 square feet
area @ 5 feet 13,734 square feet
' Storage Volume Provided: 61,219
Permanent Pool Surface Area Provided: 16,168
' Permanent Pool Volume Provided: 54845
By:
Date:
Revised:
cubic feet
square feet
cubic feet
BMH
7/29/2008
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E L 11 7t T o n n n A ][ 8 A o 91 By:
PLaN?G. Laren scnpE Axc[-srDC xa?..F?rc?grG.GI S Date:
2601 W7STom Fgcwv, STr? 203, CAKY NC 27513
ia_com (o)919.678. 1071 (F)919.678.1290
Revised:
Future Wet Detention Basin #2
Wynne Creek
Type of Impervious Landcover Area (acres)
Total Impervious Landcover: 4.77
Total Drainage Area (DA): 9.66
Percent of Impervious in Drainage Area (1): 49.39
Calculate the required storage volume (Rv)
for the 1" first flush storm event:
Rv = 0.05 + (0.009) * I
Where I = Percent of impervious from above.
Rv = 0.49
Calculate the required drainage volume
from the 1" storm to be controlled:
Volume = (design rainfall)(Rv)(Drainage Aarea)
V=1"(1/12) * Rv (1/12)(D)
V= 17,338 cubic feet
Calculate the required permanent pool surface area ratios SA /
DA (see Table 10-3 in NCDWQ BMP Manual):
I = 49.39
ratio @ 3 feet 3.00 percent
ratio @ 3.5 feet 2.50 percent
ratio @ 4 feet 2.50 percent
ratio @ 4.5 feet 2.30 percent
ratio @ 5 feet 2.00 percent
area @ 3 feet 12,621 square feet
area @ 3.5 feet 10,518 square feet
area @ 4 feet 10,518 square feet
area @ 4.5 feet 9,676 square feet
area @ 5 feet 8,414 square feet
Storage Volume Provided: 76,345 cubic feet
Permanent Pool Surface Area Provided: 21,113 square feet
Permanent Pool Volume Provided: 78889 cubic feet
BMH
7/29/2008
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E L A 7t T a D D D - A I[ 8 8 0 S I By:
PLarrrmaLnnro SCnrE ?i12CEI1T "TU17E ?EL.TC1NGrGIS Date:
2601 WFSTON PKWY, STE 203y CATLYNC 27513
,v?w_etdpa_ca® (o) 919.675. 1071 (F) 919.678.1290
Revised:
Future Wet Detention Basin #3
Wynne Creek
Type of Impervious Landcover Area (acres)
Total Impervious Landcover: 3.29
Total Drainage Area (DA): 5.75
Percent of Impervious in Drainage Area (1): 57.19
Calculate the required storage volume (Rv)
for the 1" first flush storm event:
Rv = 0.05 + (0.009) * I
Where I = Percent of impervious from above.
Rv = 0.56
Calculate the required drainage volume
from the 1" storm to be controlled:
Volume = (design rainfall)(Rv)(Drainage Aarea)
V=1"(1/12) * Rv (1/12)(D)
V= 11,797 cubic feet
Calculate the required permanent pool surface area ratios SA /
DA (see Table 10-3 in NCDWQ BMP Manual):
I = 57.19
ratio @ 3 feet 3.35 percent
ratio @ 3.5 feet 3.08 percent
ratio @ 4 feet 2.71 percent
ratio @ 4.5 feet 2.58 percent
ratio @ 5 feet 2.35 percent
area @ 3 feet 8,398 square feet
area @ 3.5 feet 7,721 square feet
area @ 4 feet 6,794 square feet
area @ 4.5 feet 6,46$ square feet
area @ 5 feet 5,891 square feet
Storage Volume Provided: 15,771 cubic feet
Permanent Pool Surface Area Provided: 12,363 square feet
Permanent Pool Volume Provided: 35893 cubic feet
BMH
7/29/2008 .

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