20150070 Ver 1_More Info Received_20150709

Strickland, Bev
From: Dev ne,8ovd
Sent: Friday, July lU'ZUl5ll:3UAK4
To: Strickland, Bev
Subject: FVV:vviU need some additional informaton
From: Allen, ]oshua [nlaiKo:1a|lenVcbnlcadanlscoconl
Sent: Thursday, ]uhO9, 2015 11:56 AM
To: Oevane,Boyd
Cc: Aldridge, ]on;Reddick, Rob; 'Fierson,]on
Subject: RE: will need some additional informaton
Good morning Boyd-
Attached are the Stormfilter supplements and O&M agreements, as requested. We're being pressed pretty hard by
our client for approval, so if you could let us know if this information is sufficient at your earliest convenience, we would
greatly appreciate it
Josh Allen, PE, CFM
Office: 919-361-5000
Direct: 919-287-0798
| |
[�
. .
Designing Tomorrow's Infrastructure &Communities
From: Reddick,Rob
Sent: Monday, June UO 2015 2:50 PM
To: 'Pierson,Jon'
Cc: Allen, Joshua; Aldridge, ]on
Subject: FW: will need some additional informaton
5� a =9
1

Received some feedback from Mr. Boyd today on the stormvvaterplans. He needs a little more information per his
email below. Thanks.
Rob
From: Devane, Boyd [mai|to:[e-mail]
Sent: Monday, June UO 2015 2:26PM
To: Reddick,Rob
Subject: will need some additional informaton
This note is not an official notification but you will get an email or letter soon, sent by the appropriate staff
member, documenting our need. However, in order to let you know as soon as possible, I'm sending you this note
directly so you can get working on this information as soon as possible.
The information needed is specified in the "ContechSupp|ement sheet. VVe will need that sheet along with
the Required Item Checklist and the O&M agreement. They can all be found on the DEMLK web page at:
http://porta|.ncdenr.orR/vveb/|r/bmp'manua| Go to BMP Supplement Forms and then to "Proprietary Systems". See
the bottom of the Excel table for the checklist and example Supplement sheet. Let me know if you have questions.
smallomrr*qwna*ncwm and nnmmimeona*,immuNwommww o puumpZcon:JmI mw and may u*aimmmwammli'dpmmwm
N

Peak Flow Calculations
1 -yr, 24 -hr runoff depth
1 -yr, 24 -hr intensity
Pre - development 1 -yr, 24 -hr runoff
Post - development 1 -yr, 24 -hr runoff
Pre /Post 1 -yr, 24 -hr peak control
Storage Volume
Design volume (WQV)
Adjusted water quality volume (WQVAdj)
Volume contained before filter
-iff Coefficient (Rv)
s loading calculations
Mean Annual Rainfall, P
Agency required TSS% removal
Percent Runoff Capture (% capture)
Event Mean Concentration of Pollutant, EMC
Filter System
Cartridge height
Specific Flow Rate, q
SHWT elevation
Bottom of the StormFilter vault elevation
Clearance (dSHwT)
Time to drain the StormFilter (t)
Time to drain the StormFilter (t)
SUMMARY
Maximum Treatment Flow Rate, cfs
Number of Cartridges
Additional Information
Does volume in excess of the design volume bypass the filter?
Is an off -line flow - splitting device used?
If draining to SA waters: Does volume in excess of the design volume flow
evenly distributed through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
9MP located at least 30ft from surface waters (5Oft if SA waters)?
r, a vegetated side slopes equal to or less than 3:1
Is the BMP located in a recorded drainage easement with a recorded access
easement to a public Right of Way (ROW)?
2.92 in
0.12 in /hr
0.99 ft/sec
0.89 ft3/sec
0.10 ft3/sec
4,978.50 ft3
3.733.8$ ft3 OK
3,900.00 ft3
0.67 (unitless)
45.00 in
85.00%
90.00%
(Suggestion: Use 60 for residential, 70 for Commercial, 100
60.00 mgll
for Industrial)
27.00 in
1.00 gpm /ft2
697.00 ft amsl
698.00 ft amsl
1.90
48.00 hours
OK Submit drainage calculations.
2,00 days
0.13
8.00
y Y or N OK
y Y or N OK
y Y or N OK
38.00 ft
y Y or N OK
y Y or N OK
y Y or N OK
y Y or N OK
Form SW401- StormFilter -Rev 1 2012Aug Parts I and It Project Design Summary, Page 1 of 1
Permit Number
(to be provided by DWQ)
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
�
401 CERTIFICATION APPLICATION FORM
�r
%wNTEGH'STORMFILTER SUPPLEMENT
4�+
ENGINEERED SOLUTIONS cs
L®ENR
This form must be filled out on line, printed and submitted with all of the required information.
Make sure to also fill out and submit the Required Items Checklist (Section Ill) and the 0 &M Agreement
_
F PROJECT INFORMATION
Project name
Willowcroft
Contact name
Josh Allen
Phone number
919 - 361 -5000
Date
June 8, 2015
Drainage area number
Subbasin 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area (AD)
89,298.36 ft' Insufficient drainage area. The maximum contributing
Impervious area
61,419.85 ft2
% Impervious (IA)
68.8% %
Design rainfall depth (RD)
1.00 in
Peak Flow Calculations
1 -yr, 24 -hr runoff depth
1 -yr, 24 -hr intensity
Pre - development 1 -yr, 24 -hr runoff
Post - development 1 -yr, 24 -hr runoff
Pre /Post 1 -yr, 24 -hr peak control
Storage Volume
Design volume (WQV)
Adjusted water quality volume (WQVAdj)
Volume contained before filter
-iff Coefficient (Rv)
s loading calculations
Mean Annual Rainfall, P
Agency required TSS% removal
Percent Runoff Capture (% capture)
Event Mean Concentration of Pollutant, EMC
Filter System
Cartridge height
Specific Flow Rate, q
SHWT elevation
Bottom of the StormFilter vault elevation
Clearance (dSHwT)
Time to drain the StormFilter (t)
Time to drain the StormFilter (t)
SUMMARY
Maximum Treatment Flow Rate, cfs
Number of Cartridges
Additional Information
Does volume in excess of the design volume bypass the filter?
Is an off -line flow - splitting device used?
If draining to SA waters: Does volume in excess of the design volume flow
evenly distributed through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
9MP located at least 30ft from surface waters (5Oft if SA waters)?
r, a vegetated side slopes equal to or less than 3:1
Is the BMP located in a recorded drainage easement with a recorded access
easement to a public Right of Way (ROW)?
2.92 in
0.12 in /hr
0.99 ft/sec
0.89 ft3/sec
0.10 ft3/sec
4,978.50 ft3
3.733.8$ ft3 OK
3,900.00 ft3
0.67 (unitless)
45.00 in
85.00%
90.00%
(Suggestion: Use 60 for residential, 70 for Commercial, 100
60.00 mgll
for Industrial)
27.00 in
1.00 gpm /ft2
697.00 ft amsl
698.00 ft amsl
1.90
48.00 hours
OK Submit drainage calculations.
2,00 days
0.13
8.00
y Y or N OK
y Y or N OK
y Y or N OK
38.00 ft
y Y or N OK
y Y or N OK
y Y or N OK
y Y or N OK
Form SW401- StormFilter -Rev 1 2012Aug Parts I and It Project Design Summary, Page 1 of 1

Permit No.
(to be provided by DWQ)
1111. (REQUIRED ITEMS CHECKLIST _J__ JE
�i
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.
Initials Pagel Plan
Sheet No.
Form SW401 -Sand Filter -Rev.5 2009Sept17 Part III, Page 1 of 1
�._ 1. Plans (1" = 50' or larger) of the entire site with labeled drainage area boundaries
- System dimensions (length, width, and depth) for the filter chamber,
- Maintenance access,
- Flow splitting device,
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable), and
- Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for StormFilter showing:
- System dimensions (length, width, and depth),
- Maintenance access,
- Flow splitting device,
- Vegetative filter strip dimensions and slope (if SA waters),
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable), and
- Boundaries of drainage easement.
3. Section view of the StormFilter Vault (1/4" =1'0" or larger) showing:
- Depth(s) of the vault containing StormFilter cartridges,
- Number of cartridges,
- Cartridges specifications,
- SHWT elevation, and
- Outlet pipe.
4. A soils report that is based upon an actual field investigation and soil borings. The results of the soils
report must be verified in the field by DWQ, by completing & submitting the soils investigation request
form. County soil maps are not an acceptable source of soils information.
7&L
5. Supporting calculations (including drainage calculations)
6. Signed and notarized operation and maintenance (0 &M) agreement
7. A copy of the deed restrictions (if required).
Form SW401 -Sand Filter -Rev.5 2009Sept17 Part III, Page 1 of 1

Permit Number
(to be provided by DWQ)
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORMa� A Arc
�w
---� —� C ,04TECH'STORMFILTER SUPPLEMENT r
4CDEHR ENGINEERED SOLUTIONS <
This form must be filled out on line, printed and submitted with all of the required information.
Make sure to also fill out and submit the Required Items Checklist (Section tlt ) and the 0 &M Ayreetnent
I. PROJECT INFORMATION
Project name Willowcroft
Contact name Josh Allen
Phone number 919 - 361 -5000
Date June 8, 2015
Drainage area number Subbasin 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area (AD)
Impervious area
% Impervious (IA)
Design rainfall depth (RD)
Peak Flow Calculations
1 -yr, 24 -hr runoff depth
1 -yr, 24 -hr intensity
Pre - development 1 -yr, 24 -hr runoff
Post - development 1 -yr, 24 -hr runoff
Pre /Post 1 -yr, 24 -hr peak control
Storage Volume
Design volume (WQV)
Adjusted water quality volume (WQVAdj)
Volume contained before filter
ff Coefficient (Rv)
s loading calculations
Mean Annual Rainfall, P
Agency required TSS% removal
Percent Runoff Capture (% capture)
Event Mean Concentration of Pollutant, EMC
Filter System
Cartridge height
Specific Flow Rate, q
SHWT elevation
Bottom of the StormFilter vault elevation
Clearance (dSHWT)
Time to drain the StormFilter (t)
Time to drain the StormFilter (t)
SUMMARY
Maximum Treatment Flow Rate, cfs
Number of Cartridges
Additional Information
Does volume in excess of the design volume bypass the filter?
Is an off -line flow - splitting device used?
If draining to SA waters: Does volume in excess of the design volume flow
evenly distributed through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
I 3MP located at least 30ft from surface waters (50ft if SA waters)?
A. a vegetated side slopes equal to or less than 3:1
Is the BMP located in a recorded drainage easement with a recorded access
easement to a public Right of Way (ROW)?
645,997.38 ftZ Insufficient drainage area. The maximum contributing
207,782.03 ft'
32.2% %
1.00 in
2.92 in
0.12 in /hr
0.99 ft 3 /sec
0.89 ft3 /sec
0.10 }t3 /sec
18,275.20 ft3
ft3 OK
13,706.40 ft'
0.34 (unitless)
45.00 in
85.00%
90.00%
60.00 mgll (Suggestion: Use 60 for residential, 70 for Commercial, 100
for Industrial)
27.00 in
1.00 gpm /ftz
697.00 ft amsl
697.10 ft amsl
0.10
48.00 hours
OK. Submit drainage calculations.
2.00 days
0.48
29.00
X Y or N OK
y Y or N OK
rKes 11 we] Irl
60.00 ft
y YorN OK
y Y or N OK
y YorN OK
Y or N OK
Form SW401 -Storm Filter-Rev 1 2012Aug Parts I and 11. Project Design Summary, Page 1 of 1

Permit N©.
(to be provided by DWQ)
1111. 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.
Initials Pagel Plan
Sheet No.
1. Plans (1" = 50' or larger) of the entire site with labeled drainage area boundaries
- System dimensions (length, width, and depth) for the filter chamber,
- Maintenance access,
- Flow splitting device,
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable), and
- Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for StormFilter showing:
Form SW401 -Sand Filter -Rev.5 2009Sept17 Part III, Page 1 of 1
- System dimensions (length, width, and depth),
- Maintenance access,
- Flow splitting device,
- Vegetative filter strip dimensions and slope (if SA waters),
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable), and
- Boundaries of drainage easement.
3. Section view of the StormFilter Vault (114" =1'0" or larger) showing:
- Depth(s) of the vault containing StormFilter cartridges,
- Number of cartridges,
- Cartridges specifications,
- SHWT elevation, and
- Outlet pipe.
4. A soils report that is based upon an actual field investigation and soil borings. The results of the soils
report must be verified in the field by DWQ, by completing & submitting the soils investigation request
form. County soil maps are not an acceptable source of soils information.
5. Supporting calculations (including drainage calculations)
6. Signed and notarized operation and maintenance (0 &M) agreement
7. A copy of the deed restrictions (if required).
Form SW401 -Sand Filter -Rev.5 2009Sept17 Part III, Page 1 of 1

Permit Number:
(to be provided by DWQ)
StormFilter 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:
— The drainage area will be carefully managed to reduce the sediment load to the
StormFilter.
— The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds
six inches.
The StormFilter system will be inspected quarterly. 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.
Entire BMP
Adjacent pavement (if
applicable)
Flow diversion structure
StormFilter Cartridges
Trash/ debris is present.
Sediment is present on the
pavement surface.
The structure is clogged.
The structure is damaged.
Cartridges not performing as
designed - see Contech I &M
document to determine if cartridge
Remove the trash/ debris.
Sweep or vacuum the sediment as soon as
possible.
Unclog the conveyance and dispose of any
sediment offsite.
Make any necessary repairs or replace if
damage is too large for repair.
Replace cartridges per manufacturer's
recommendations.
maintenance is required.
Outlet device Clogging has occurred. Clean out the outlet device. Dispose of
the sediment offsite.
The outlet device is damaged Repair or replace the outlet device.
Receiving water Erosion or other signs of damage Contact the NC Division of Water
have occurred at the outlet. Quality 401 Oversight Unit at 919 -733-
1786.

Permit Number:
(lo be provided by DWQ)
All other operation and maintenance activities should be in accordance with Contech's StormFilter
Inspection and Maintenance Procedures document. Any problems that are found shall be repaired
immediately. I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above and have received and understand Contech's
StormFilter Inspection and Maintenance Procedures document. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Willoweroft
BMP drainage area number:South
Print name:Robert Price
Title:Land Construction Manager
Address: 11605 N. Community House Road
Phone: 704-944--&23 9
Signature:
Date:
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.
mss'' 1/ ,
I, �rW ( l,�Y ✓wV / , a Notary Pit4k for the State f
County of , do hereby certify that j�'f e-
personally appeared before me this day of 6 , and acknowledge the due
execution of the forgoing sand filter maintenance requirements. fitness my hand and official seal,
Andrea T Turner
Notary Public
Mecklenburg County, North Carolina
My Commission Expires 06 -19 -18
SEAL I
My comm ,�y ission expires I d — lq -` I Q )