20120387 Ver 2_Stormwater Info_20130712

DWQ Proposal
The attached documents demonstrate our plans to construct our bio retention cell. Below is our
planned construction sequence as well as the total square footage of impact. We will also secure the
entire bio retention cell as a drainage easement. Our bio retention cell will include (at minimum) one
tree and three herbaceous species. We plan to work with a landscape architect to vegetate the surface of
the cell.
Planned Construction Sequence
-After laying the foundation, the hole for the bio retention cell will be dug
-The underground pipe will be laid to the bio retention cell when the gutters are secured
-The land will be laid with sod or seeded during the final stages of construction
-The bio retention cell will be filled with the required sediment and fully landscaped
Total Impacts
Area of Impact
Total Square Footage
House in Zone 1
100 +�-
House in Zone 2
656
Driveway in Zone 1
398 v
Driveway in Zone 2
574
Fill in Zone 1
955
Total
2,6831

Permit Number:
(to be provided by DWQ)
Ago I
o�oF warF9Qc
NCDENR Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL 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.
Project name Bayer Residence
Contact name John Bayer
Phone number 919 - 8094436
Date July 8, 2013
Drainage area number 1
F
?.
.. � �.�s ..-tYn- HE
No (Y or N)
1 -yr, 24 -hr runoff depth
,
Site Characteristics
1 -yr, 24 -hr intensity
in /hr
Pre - development 1 -yr, 24 -hr peak flow
ft'/sec
Drainage area
ft'/Sec
Pre /Post 1 -yr, 24 -hr peak control
756 ft2
Storage Volume: Non-SA Waters
Impervious area
Minimum volume required
ft 3
756 ft2
ft3
Percent impervious
100.0%
%
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is pre /post control of the 1 -yr, 24 -hr peak flow required?
No (Y or N)
1 -yr, 24 -hr runoff depth
in
1 -yr, 24 -hr intensity
in /hr
Pre - development 1 -yr, 24 -hr peak flow
ft'/sec
Post - development 1 -yr, 24 -hr peak flow
ft'/Sec
Pre /Post 1 -yr, 24 -hr peak control
ft3 /sec
Storage Volume: Non-SA Waters
Minimum volume required
ft 3
Volume provided
ft3
Storage Volume: SA Waters
1.5' runoff volume ft3
Pre - development 1 -yr, 24 -hr runoff ft3
Post - development 1 -yr, 24 -hr runoff ft3
Minimum volume required 0 ft3
Volume provided ft3
Cell Dimensions
Ponding depth of water
Ponding depth of water
Surface area of the top of the bioretention cell
Length:
Width:
-or- Radius
Media and Soils Summary
Drawdown time, ponded volume
Drawdown time, to 24 inches below surface
Drawdown time, total:
In -situ soil:
Soil permeability
Planting media soil:
Soil permeability
Soil composition
% Sand (by volume)
% Fines (by volume)
% Organic (by volume)
Phosphorus Index (P- Index) of media
Form SW401- Bioretention -Rev.8
June 25, 2010
6 inches
0.50 ft
126.0 ft2
ft
ft
10 ft
12 hr
24 hr
36 hr
in /hr
in /hr
Insufficient ponding depth.
OK
OK
OK
OK
88% OK
10% OK
2 % Organic should be -3 -5%
Total: 100%
30 (unitless) OK
Parts I and II. Design Summary, Page 1 of 2

Permit Number:
(to be provided by DWQ)
Basin Elevations
Temporary pool elevation
204.00 fmsl
Type of bioretention cell (answer "Y" to only one of the two
Y or N;
following questions):
Is this a grassed cell?
No (Y or N)
Is this a cell with trees /shrubs?
Yes (Y or N)
Planting elevation (top of the mulch or grass sod layer)
203.5 fmsl
Depth of mulch
3 inches OK
Bottom of the planting media soil
200.5 fmsl
Planting media depth
3 ft
Depth of washed sand below planting media soil
ft
Are underdrains being installed?
No (Y or N)
How many clean out pipes are being installed?
NA OK
What factor of safety is used for sizing the underdrains? (See
Is the BMP located at least 100 feet from water supply wells?
BMP Manual Section 12.3.6)
(Y or N)
Additional distance between the bottom of the planting media and
Yes
the bottom of the cell to account for underdrains
0 ft
Bottom of the cell required
200.5 fmsl
SHWT elevation
197 fmsl
Distance from bottom to SHWT
3.5 ft OK
Internal Water Storage Zone (IWS)
Does the design include IWS Y (Y or N)
Elevation of the top of the upturned elbow fmsl
Separation of IWS and Surface 203.5 ft
Planting Plan
Number of tree species 1
Number of shrub species 0
Number of herbaceous groundcover species 3 OK
Additional Information
Does volume in excess of the design volume bypass the
Yes
Y or N;
bioretention cell?
Does volume in excess of the design volume flow evenly distributed
Yes
(Y or N
through a vegetated filter?
What is the length of the vegetated filter?
_ 30 ft
Does the design use a level spreader to evenly distribute flow?
No
(Y or N)
Is the BMP located at least 30 feet from surface waters (50 feet if
Yes
(Y or N)
SA waters)?
Is the BMP located at least 100 feet from water supply wells?
Yes
(Y or N)
Are the vegetated side slopes equal to or less than 3:1?
Yes
(Y or N)
Is the BMP located in a proposed drainage easement with access
Yes
(Y or N)
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
ft /sec
Is the area surrounding the cell likely to undergo development in
NO
(Y or N)
the future?
Are the slopes draining to the bioretention cell greater than 20 %?
No
(Y or N)
Is the drainage area permanently stabilized?
Yes
(Y or N)
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(8'inches gravel followed by 3 -5 ft of grass)
Grassed swale
Forebay
Other
Enter Data
Enter Data
Enter Data
Enter Data
Enter Data
Insufficient vegetated side slopes
Insufficient ROW location.
Enter Data
Insufficient slopes for design.
Insufficient stabilization.
Form SW401- Bioretention -Rev.8
June 25, 2010 Parts I and II. Design Summary, Page 2 of 2

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Bioretention 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 operation and maintenance procedures:
— Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
— Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
— Heavy equipment will NEVER be driven over the bioretention cell.
— Special care will be taken to prevent sediment from entering the bioretention cell.
— Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it 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 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 problems:
How I will remediate the problem:
The entire BMP
Trash /debris is presen t.
Remove the trash /debris.
The perimeter of the
bioretention cell
Areas of bare soil and /or
erosive gullies have formed.
Regrade the soil if necessary to
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
The inlet device: pipe,
The pipe is clogged (if
Unclog the pipe. Dispose of the
stone verge or swale
applicable).
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the
Regrade the swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or
Remove sediment and clogged
covered in sediment (if
stone and replace with clean stone.
applicable).
Form SW401- Bioretention O &M -Rev.3 Page 1 of 4

BMP element:
Potential problems:
How I will remediate the problem:
The pretreatment area
Flow is bypassing
Regrade if necessary to route all
pretreatment area and /or
flow to the pretreatment area.
gullies have formed.
Restabilize the area after grading.
Sediment has accumulated to
Search for the source of the
a depth greater than three
sediment and remedy the problem if
inches.
possible. Remove the sediment and
restabilize the pretreatment area.
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.
The bioretention cell:
Best professional practices
Prune according to best professional
vegetation
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.
Tree stakes /wires are present
Remove tree stake/ wires (which
six months after planting.
can kill the tree if not removed).
The bioretention cell:
Mulch is breaking down or
Spot mulch if there are only random
soils and mulch
has floated away.
void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at
a maximum depth of three inches.
Soils and /or mulch are
Determine the extent of the clogging
clogged with sediment.
- remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off -site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
possible.
An annual soil test shows that
Dolomitic lime shall be applied as
pH has dropped or heavy
recommended per the soil test and
metals have accumulated in
toxic soils shall be removed,
the soil media.
disposed of properly and replaced
with new planting media.
Form SW401- Bioretention O &M -Rev.3 Page 2 of 4

BMP element:
Potential problems:
How I will remediate the problem:
The underdrain system
Clogging has occurred.
Wash out the underdrain system.
(if applicable)
The drop inlet
Clogging has occurred.
Clean out the drop inlet. Dispose of
the sediment off -site.
The drop inlet is damaged
Repair or replace the drop inlet.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality 401 Oversight Unit at 919 -
outlet.
733 -1786.
Form SW401- Bioretention O &M -Rev.3 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: CE�) Z / P—> C6
BMP drainage area number:
Print name: � � 0 t-#J
Title:
Address: -33,5-3 C /4- &5t, -JVc-L ptL f ,LezgoI+ , tic— S-? C.00 q
Phone:_ 19 30q — C111 3 (I.
Signature:
Date: 7
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.
C , a Notary Public for the State of
CYI A aVCl -.tie. , County of U003— , do hereby certify that
"-�°ty personally appeared before me this C1
day of W15 , and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires
C\ -k0 -k3
Form SW401- Bioretention I &M -Rev. 2 Page 4 of 4

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