20080067 Ver 3_More Info Letter_20110310

CCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
March 10, 2011
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
North Broad Street, LLC
201 Weston Parkway, Suite 203
Cary, NC 27513
Subject Property: Alston Pond
Ut to Basal Creek [030403, 29-43-15-3, B, NSW]
REQUEST FOR MORE INFORMATION
Dear Sir or Madam:
DWQ Project # 08-0067, Ver. 3
Wake County
On February 3, 2011, the Division of Water Quality (DWQ) received your application dated February 1,
2011, to impact 0.033 acres of 404/wetland (0.019 acres permanent impact and 0.014 acres temporary
impact), 147 linear feet of perennial stream, 27 linear feet intermittent stream (temporary impact), and
33,550 square feet of Zone 1 Neuse River basin protected riparian buffers and 19,501 square feet of Zone
2 Neuse River basin protected riparian buffers to construct the proposed residential development at the
site. The DWQ has determined that your application was incomplete and/or provided inaccurate
information as discussed below. The DWQ will require additional information in order to process your
application to impact protected wetlands and/or streams on the subject property. Therefore, unless we
receive five copies of the additional information requested below, we will place this project on hold as
incomplete until we receive this additional information. If we do not receive the requested information,
your project will be formally returned as incomplete. Please provide the following information so that we
may continue to review your project.
Additional Information Requested:
1. There were significant inadequacies in the stormwater management plan. Please be advised that
ALL of the following requests must be provided in your resubmittal or the project will be
returned.
2. Along with the Supplement Forms, please provide one Required Items Checklist for each
proposed wet detention basin. Please provide ALL information that was omitted in the most
recent submittal. These items include, but are not limited to, a soils report that documents the
level of the seasonal high water table at each proposed BMP (via a soil boring done within the
footprint of each BMP), the boundaries of the drainage areas for the BMPs, the maintenance
access and the boundaries of the drainage easements for the stormwater devices.
3. You must completely fill out each Supplement Form (both Wet Detention and LS-VFS Forms)
and correct all known errors in design.
Wetlands, Buffers, Stormwater, Compliance and Permitting Unit (WeBSCaPe) One 1650 Mail Service Center, Raleigh, North Carolina 27699-1650
Phone: [phone] FAX: [phone] ra Carolina
Internet: http://portal.ncdenr.org/web/wq/ws y?a
//?/
An Equal Opportunity 1 Affirmative Action Employer , Lll?
North Broad Street, LLC
Page 2 of 3
March 10, 2011
4. Please provide actual calculations of the average depth. Assuming an average depth is not
sufficient.
5. Please provide actual calculations of the drawdown time. Reporting 2.00 days in each Wet
Detention Basin Supplement Form is not sufficient.
6. Please provide a hardened emergency spillway for each proposed Wet Detention Basin.
7. Please provide specifications for the anti-seep collars on the outlet barrels and please check to see
if one anti-seep collar will be sufficient based on the length of the barrels.
8.. The planting plans should show how the different plant species are to be distributed on the
vegetated shelf.
9. You must sign and seal all plan sheets and the calculations booklet.
10. Please provide a minimum of one foot of freeboard for each proposed wet detention basin.
11. The LS-VFS Required Items Checklist states that a plan detail at a scale of 1" = 30' or larger has
been provided but DWQ was unable to find them on Sheet 28.
12. In addition to the above, please address the following issues specifically associated with BMP #1:
a. It appears that the forebays comprise more than 20% of the overall volume of the wet
detention basin. Please calculate the volumes and adjust as needed.
b. An LS-VFS is required at the outlet of this device. Please provide an LS-VFS design, a
Supplement Form and a Required Items Checklist with all required items. Please be sure
that the LS-VFS is designed in accordance with Chapter 8 of the BMP Manual.
13. In addition to the above, please address the following issues specifically associated with BMP #2
and its associated level spreader:
a. A level spreader may not be used adjacent to the riparian buffer in the proposed location
because the slope exceeds five percent.
b. An LS-VFS is required at the outlet of this device. Please provide an LS-VFS design, a
Supplement Form and a Required Items Checklist with all required items. Please be sure
that the LS-VFS is designed in accordance with Chapter 8 of the BMP Manual.
14. In addition to the above, please address with following issues specifically associated with BMP
#3:
a. The flow path for this device is inadequate, particularly for the stormwater entering via
FES 300. Please redesign this device to provide a flow path of at least 3:1.
b. An LS-VFS is required at the outlet of this device. Please provide an LS-VFS design, a
Supplement Form and a Required Items Checklist with all required items. Please be sure
that the LS-VFS is designed in accordance with Chapter 8 of the BMP Manual.
North Broad Street, LLC
Page 3 of 3
March 10, 2011
15. Your plans show cut and/or fill impacts to Zone 2 of the buffer to facilitate siting of proposed
storm water BMPs. The buffer rules do not allow for this cut and/or fill in the buffer. Please
relocate these proposed storm water BMPs outside of the buffer and resubmit the plans.
Please submit this information within 30 calendar days of the date of this letter. If we do not receive this
requested information within 30 calendar days of the date of this letter, your project will be withdrawn
and you will need to reapply with a new application and a new fee.
This letter only addresses the application review and does not authorize any impacts to wetlands, waters or
protected buffers. Please be aware that any impacts requested within your application are not authorized (at
this time) by the DWQ. Please call Mr. Ian McMillan or Ms. Amy Chapman at 919-807-6301 if you have
any questions regarding or would like to set up a meeting to discuss this matter.
Sincerely,
r r `I,
Ian McMillan, Acting Supervisor
Wetlands, Buffers, Stormwater, Compliance and Permitting
Unit (WeBSCaPe)
IJM
cc: USACE Raleigh Regulatory Field Office
Lauren Witherspoon, DWQ Raleigh Regional Office
File Copy
Troy Beasley, Withers & Ravenel, 1410 Commonwealth Drive, Suite 101, Wilmington, NC 28403
Filename: 080067Ver3AlstonPond(Wake)On_Hold
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Article Addressed to:
NORT H BROAD STREET LLC 3/11/11
201 WESTON PARKWAY STE 203
CARY NC 27513
DWQ 08-0067 V3 WAKE COUNTY
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