20090063 Ver 2_More Info Letter_20100319

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North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
March 19, 2010
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Wake County Board of Education
1551 Rock Quarry Road
Raleigh, NC 27518
Subject Property: Rolesville Middle School
Ut to Toms Creek [030402, 27-24, C, NSW]
REQUEST FOR MORE INFORMATION
Dear Sir or Madam:
DWQ Project # 09-0063
Wake County
On February 5, 2010, the Division of Water Quality (DWQ) received your application dated February 5, 2010,
to fill or otherwise impact 0.085 acres of 404/wetland (0.069 acres permanent impact and 0.016 acres temporary
impact), 135 linear feet of perennial stream (105 linear feet permanent impact and 30 linear feet temporary
impact), and 10,960 square feet of Zone 1 Neuse River basin protected riparian buffers and 9,748 square feet of
Zone 2 Neuse River basin protected riparian buffers, to construct the proposed middle school 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:
Stormwater Comments:
1. Wet Pond:
a. Please note that wet detention pond alone does not achieve 30% Total Nitrogen removal efficiency
as required by the Neuse (NSW) stormwater requirements. You may do one of the following:
i. Redesign the pond for 85% TSS and combine it with other treatment device such as
grassed swale (meeting swale seeking credit design guidelines) or level spreader-
vegetative filter strip system (minimum 30 feet to wetland).
ii. Since the pond has been designed for 90% TSS (being larger than 85% TSS pond but
less than area required for a stormwater wetland), you may choose to redesign it as a
pond-wetland hybrid system. This can be achieved by creating a pond (large deep pool
of water) in the middle, widening the 10-ft shelf to about 15-20 ft around the pool of
water with the inner two-thirds as shallow water and the outer one-third as shallow
land.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
Location: 2321 Crabtree Blvd., Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: http://h2o.enr,state.nc.us/ncwetlands/
NonrthCarohna
Naturally
An Equal Opportunity 1 Affirmative Action Employer
Wake County Board of Education
Page 2 of 3
March 19, 2010
b. Appropriate plants for the zones MUST be selected, and a detail planting plan shall be provided.
We believe if designed and constructed properly, this could achieve the required 30% nitrogen
treatment. Please refer to the stormwater wetland section of the NC DWQ BMP Manual for plant
selection.
c. Due to the close proximity of the wet pond to the wetland, coupled with the type of soils at the pond
location, this office recommends that a clay liner or other engineering measure must be provided to
avoid impacting the adjacent wetland.
d. The 3" orifice appears to drawdown too quickly (1.75 days) by our calculations. Please use a 2.5"
orifice unless design changes. It is recommended that you use a larger pipe with the orifice hole
drilled in a cap on the pipe for easy maintenance.
e. Please provide anti-flotation calculation for the outlet structure.
f. Please show the emergency spillway on the plan view
2. Level Spreader:
a. Please provide level spreader detail having all required components such as forebay, blind
swale/channel, level spreader lip (concrete) and a 3-ft of #57 stone underlain by a filter fabric
immediately downslope of the LS-lip.
3. Bioretention Areas:
a. Please note that the required surface area at the top of the bioretention cells shall be provided and
measured at the top of the planting media and not the top of ponded water surface (berm). This area
shall be equal to the design volume divided by the ponding depth.
b. Please provide a depressed type of dissipation device rather than a flat apron at the pipe outlets into
the bioretention cells.
c. Please specify the soil media mix, source of the media, phosphorus index (P-Index) and they type
of grass (Centipede or fescue/blue grass mix) on the plans.
d. Please provide direct discharge for the larger storms to the stream. This can be achieved with a pipe
or riprap channel from an overflow device, and the flow from the underdrain pipes must be
connected to the bypass pipe/channel.
4. Operation and Maintenance (O & M) Agreement Forms: All sections and pages of the form for each
device must be provided. Only the notarized pages were received for each device.
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 Ms. Cyndi Karoly or Mr. Ian McMillan at 919-733-1786 if you have any
questions regarding or would like to set up a meeting to discuss this matter.
Since ly,
Ian McMillan, Acting Supervisor
401 Oversight/Express Review Permitting Unit
IJM
Wake County Board of Education
Page 3 of 3
March 19, 2010
cc: USACE Raleigh Regulatory Field Office
Lauren Witherspoon, DWQ Raleigh Regional Office
File Copy
Robert S. Bartlett, Bartlett Engineering and Surveying, PC, 1906 Nash Street NW, Wilson, NC 27893
Filename: 090063Ver2RolesvilleMiddleSchool(W ake)On_Hold
■ Complete items 1, 2, and 3. Also complete
Item 4 if Restricted Delivery is desired.
■ Print your name and address on the reverse
so that we can return the card to you.
■ Attach this card to the back of the mailpiece,
or on the front if space permits.
1. Article Addressed to:
Mr Timothy Driscoll 3/22/10
Wake Co Board of Education
1551 Rock Quarry Rd
Raleigh NC 27518
DWQ 19 040Wake County
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2. Article Number
(Transfer from service label) 7009 2820 0003 8 4 4 3 51, 8 4

UNITED $TAS C?Q�
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NC DENR DIVISION OP WATER QUALITY
401 OVERSIGHT/EXPRESS UNIT
2321 CRABTREE BOULEVARD. SUITE 250
RALEIGH, NC 27604
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