20071638 Ver 2_More Info Letter_20080116

~~~ W'4 T~~jO Michael F. Easley, Governor
.,~ G William G. Ross Jr., Secretary
tom-- North Carolina Department of Environment and Natural Resources
~ ~
(~ ~ Coleen H. Sullins, Director
Division of Water Quality
January 16, 2008
DWQ EXP No. 07-1638v2
Johnston County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Garner Development Partners, LLC
Attn: Mr. Jason Hudak
263 White Oak Drive
Beckley, WV 25801
Subject Property: East Park Plaza
REQUEST FOR MORE INFORMATION
Dear Mr. Hudak:
On January 14, 2008, the Express Review Program of the Division of Water Quality (DWQ) received
your application for the above referenced project. The DWQ has determined that your application will
require additional information. Please provide the following information so that we may continue to
review your project and prevent denial of your application as required by 15A NCAC 2H .0506:
Additional Information Requested
Diffuse Flow Provisions:
a. Please provide BMP outflow calculations for the 1" and 10-year storms.
b. Please provide calculations for the sizing of the energy dissipater for both outlet structures
based on the 10-year storm.
c. Please include the construction sequence of the BMPs on the plan sheets.
d. Wetland 1: In the sizing of the required surface area, a temporary pool (Dplancs) depth of 12
inches was used with temporary pool elevation set at 246.5 feet used in sizing the orifice.
Meanwhile, plan sheet # CV-9 indicates a permanent pool elevation at 245.0 feet, high marsh
(shallow land) elevation at 245.5 feet, and temporary pool elevation at 246.0 feet. The result
is that there is only 0.5 feet of temporary pool elevation and since the entire treatment volume
for the 1" storm should be above the high marsh elevation. Please revise plan sheets and
calculations to eliminate these discrepancies.
e. Wetland 2: In the sizing of the required surface area, a temporary pool (DPtants) depth of 12
inches was used with temporary pool elevation set at 206.5 feet used in sizing the orifice.
Meanwhile, plan sheet # CV-9 indicates a permanent pool elevation at 205.0 feet, high marsh
(shallow. land) elevation at 205.5 feet, and temporary pool elevation at 206.0 feet. The result
is that there is only 0.5 feet of temporary pool elevation and since the entire treatment volume
for the 1" storm should be above the high marsh elevation. Please revise plan sheets and
calculations to eliminate these discrepancies.
f. Please see section 3.5.2 of the NC DWQ Stormwater Best Management Practices Manual for
the driving head used in the computation of the draw down. It shall be Ho/3 where Ho is the
temporary pool depth above the high marsh elevation, Ho = 1.0 foot in this case.
401 Oversight I Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] FAX [phone]nternet: http://h2o.enr.state.nc.us/ncwetlands
Noe Carolina
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East Park Plaza
Page 2 of 2
January 16, 2007
2. Stream Impact:
a. Your PCN application requests 149.5 linear feet of perennial stream impact. Since this impact
is so close to the mitigation threshold of 150 linear feet, field verification was required. On
January 14, 2008, a field meeting was conducted with Mr. David Meyer and a stake was placed at
the location that is 149.5 linear feet of stream impact. Mr. Meyer stated that he would have the
stake surveyed in and would coordinate with the engineers. If the actual stream impact is greater
than 150 linear feet, then stream mitigation will be required. If your project utilizes NCEEP for
mitigation credits, then an EEP acceptance form must be submitted to this office.
Please note that, this does not constitute a thorough review of the Stormwater BMPs provided for the site
since that will be reviewed under the Johnston County NSW Stormwater Program. This review is for the
Diffuse Flow Provisions required by the DWQ in order to protect buffers of the Neuse River Basin. If
there are any changes as result of the stormwater review by Johnston County, the above requested
additional information should reflect in your next submittal of all plans and supporting documents to our
office.
Please respond within five (5) days of the date of this letter by sending two (2) copies of the above
information in writing. The Express Review Program is a process that requires all parties to participate in a
timely manner.
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 contact Joseph Gyamfi or Lia Myott at 919-733-1786 if you have any questions regarding or
would like to set up a meeting to discuss this matter.
Sincerely,
.~
Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBK/lem/jg
cc: James Shern, USACE Raleigh Regulatory Field Office
Lauren Witherspoon, DWQ Raleigh Regional Office
File Copy
Central Files
David E. Meyer, Protocol Sampling Service, Inc., Post Office Box 31133, Raleigh NC 27622