20050949 Ver 1_More Info Received_20051107 (4)

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ROBIN MAYCOCK LITTLE
5409 NEW REBEL COURT, YOUNGSVILLE, NC 27596
919-418-7645
November 4, 2005
Mr. Monty Matthews
Raleigh Regulatory Field Office
U.S. Army Corps of Engineers
6508 Falls of the Neuse Road, Suite 120
Raleigh, NC 27615
Subject: Approved Stormwater Plans and Proposed Site Plans for Lots 18 and 19 of
Partners Equity Group Subdivision, Industrial Park Road, Smithfield, Johnston
County. Action ID# 200520934, DWQ Project # 05-0949
Dear Mr. Matthews:
Enclosed are two copies of the site plans for the subject project, as requested on August 25, 2005.
They show the proposed wetland impacts, including fill slopes, with the proposed lot layout
shown as an overlay on the site plans. All jurisdictional wetlands, isolated or non-isolated, and
streams or other waters of the State are shown as overlays on the site plans.
Also enclosed are two copies of the plans and one copy of the calculations for the approved and
existing stormwater management practices, which were designed to accommodate stormwater
runoff for the entire 51-acre property, at maximum impervious surface development. (See
correspondence dated August 3 and July 29, 1999) and finally, the approval letter from the
Ecosystem Enhancement Program for In-Lieu Fee Mitigation, dated August 5, 2005, is also
enclosed for your records.
By copy of this letter we also submit seven copies of each of the above mentioned enclosures,
with the exception of the Drainage Pond and Erosion Control Calculations, prepared by McKim
and Creed Engineers, P.A. in March 1999, to the Division of Water Quality for review.
The Ecosystem Enhancement Program is interested in coordinating with Mr. Shallcross on the
stormwater detention system currently in place in order to design a restoration plan for Buffalo
Creek immediately downstream of the subject property. If you have any questions or need any
additional information, do not hesitate to contact Mr. John Shallcross at 919-934-3852 or Ms.
Robin Maycock Little at 919-418-7645.
S' rely,
Robin Maycock Little
CC: Mr. John Shallcross a
Ms. Cyndi Karoly, DWQ
Mr. Mike Horan, DWQ Regional Office
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August 3, 1999
Mr. Todd St. John
NCDENR - Division of Water Quality
4401 Reedy Creek Rd.
Raleigh, NC 27607
M&C 1319-0001.OR
RE: Response To Comments for Partners Equity Detention Pond - DWQ Project No. 970656
Dear Mr. St. John:
In response to the comments from the review of the stormwater management plan and detention
basin, we are providing the additional information requested in your letter dated July 29, 1999.
1. Permanent Water Quality Pool, Temporary Water Quality Pool
The volumes for the forebays, permanent pool and temporary pool provided in the °401
Wet Detention Basin Work Sheet" do not appear to reflect the actual volumes reflected
by the plans. As such, the volumes indicated in the "Work Sheet" would not be
adequate to meet the NCDENR Stormwater Best Management Manual's design
requirements. However, the actual volumes provided in the plans may be adequate.
There was a mistake ion the calculation of the volumes that you noted. The
correct information should be as follows:
Bottom Elevation = 140.00
Permanent Pool Elevation = 143.00
Temporary Pool Elevation = 145.35
Permanent Pool Area = 49658 sf
Drainage Basin = 50.9 ac.
Impervious Area = 20.4 ac.
Permanent Pool Volume = 89394 cf
Temporary Pool Volume = 281,569 cf
Forebay Volume = 19846 cf
2. Emergency Drain
An emergency drain or similar mechanism must be provided to draw down the
permanent pool volume. Please specify this on the engineering plans.
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Page 2
Per our conversation, we have provided a note on the plans, requiring the owner
to provide a pump to draw down the permanent pool should it be necessary.
3. Sediment Removal
If the basin is proposed to be used as a sediment basin during construction, the plans
must clearly indicate that accumulated sediment will be removed prior to implementation
as a wet detention basin.
We have provided a note in the construction sequence, as well as on the erosion
control plan, stating that all accumulated sediment must be removed and proper
grades achieved, prior to implementing as a wet detention basin.
4. Drainage Area
Please indicate the drainage area including offsite drainage to the basin.
We have enclosed a delineated drainage map showing the drainage patterns of the
proposed detention basin. On and offsite flows are shown.
5. Stormwater Flow to Remaining Wetlannds
As we discussed in our phone conversation today, the 401 Water Quality Certification
issued September 4, 1997 for this project requires that some of the stormwater be
diverted to the remaining wetlands. After consulting with Staff from this Office,
recommend that 3 acres of impervious surface be directed to the existing 3 acres of
wetlands. The runoff should enter the wetlands as diffuse or sheet flow at non-erosive
or channel forming velocities. Please document the methods used to achieve the above.
Diversion of 3 acres of drainage has been shown on the construction plans.
We feel this provides you with the requested additional information required. We appreciate
your comments and hope this will help you in completing your final technical review. Should you
have any questions, or need any additional information, please feel free to call me at 233-8091.
0:\1319\0001 \10X080399. DWQ.doc

Page 3
Sincerely,
MCKIM & CREED
Grant Livengood, E.I.
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Q:%1319\0001\101080399.OWQ.doc .
State of North Carolina
Department of Environment
and Natural Resources
Division ofWater Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Kerr T. Stevens, ,Director
Mr. Grant Livengood
McKim and Creed Engineers
5625 Dillard Road, Suite 117
Cary, NC 27511
Subject: Partners Equity
DWQ Project No. 970656
Johnston County
Dear Mr. Livengood:
The Wetlands Unit staff reviewed the stormwater management plans for the subject project and determined
that additional information is necessary to complete the technical review process. The required additional
information is as follows:
1. Permanent Water Quality Pool, Temporary Water Quality Pool
The volumes for the forebays, permanent pool and temporary pool provided in the "401 Wet -
Detention Basin Work Sheet" do not appear to reflect the actual volumes reflected by the plans. As
such, the volumes indicated in the "Work Sheet" would not be adequate to meet the NCDENR
Stormwater Best Management Manual's design requirements. However, the actual volumes provided
in the plans may be adequate.
2. Emergency Drain
An emergency drain or similar mechanism must be provided to draw down the permanent pool
volume. Please specify this on the engineering plans.
3. Sediment Removal
If the basin is proposed to be used as a sediment basin during construction, the plans must clearly
indicate that accumulated sediment will be removed prior to implementation as a wet detention
basin.
4. Drainage Area
Please delineate the drainage area including offsite drainage to the basin.
5. Stormwater Flow to Remaining Wetlands
As we discussed in our phone conversation today, the 401 Water Quality Certification issued
September 4, 1997 for this project requires that some of the stormwater be diverted to the remaining
wetlands. After consulting with Staff from this Office, I recommend that 3 acres of impervious
4401 Reedy Creek Road, Raleigh, NC 27607 Telephone [phone] FAX [phone]
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