SW6100701_Add Info_20100712

VA
HC®ENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Mr. Joe E. Godwin, Sr., PE
Enoch Engineers, PA
1403 NC 50 S.
Benson, NC 27504
Dear Mr. Godwin:
Division of Water Quality
Coleen H. Sullins
Director
July 12, 2010
Dee Freeman
Secretary
JUL.13 2010
DWO
Subject: Request for Additional Information
Stormwater Project No. SW6100701
Traemoor Connection
Cumberland County
The Division of Water Quality Central Office received a Stormwater Management Permit Application for
the subject project on July 2, 2010. A preliminary review of that information has determined that the
application is not complete. Thr_ following information is needed,to continue the stormwater review:
Please provide the deed restriction form for high density projects with outparcels. This form is
available from the website: http-.//poht l.nedenr.org/web/Wq/-;vJsu/statesw/forms—docs
2. Please provide a soils report that specifically states a S1-IWT within the BMP footprint. Note
that the SHWT is not the same as whether or not ground water was present at the time of the
borings.
3. Please provide a plan sheet(s) with the drainage area (DA) delineated for the pond; and label
the site area and impervious area.
4. The plans state that the Harris Teeter and Pharmacy sites will be permitted separately but
appear to drain to the t.coposed pond. Please explain. Also, is the BUA for each of these
included in the BU; 4 the pond is designed to treat?
5. The Secretary of State website states that HCC INVESTMENTS, LLC is `On Notice' and
proposed to be dissolve,,,J. Please provide more information about this. We cannot issue a
permit to a LLC that k' €issolved.
6. Provide site plan sheet(s) that show all relevant information (ie: curb & gutter, sidewalks, roads,
etc.). Also, the relevant details must be provided.
Wetlands and Stormwater Branch
1617 Mail Service Center, Ralegh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Ralegh, North Carorina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.arg
An Equal Opportunity 1 Affirmative Adon Employer
Nne
orthCarol ina

Mr. Joe E. Godwin, Sr., PE r'
SW6100701 — Traemoor Connection
July 12, 2010
7. The drainage system around the pharmacy appear to show as existing. Are these existing or
proposed pipes?
8. Please provide detailed grading plans for the entire site, including the outparcels. The plans
should include all existing, proposed contours and spot elevations, locations of roof drains
should also be shown.
9. Some of the duplex area, outparcels F, G, 1-I, and 1, and parts of the retail areas along Rockfish
Road appear to not drain to the pond. All impervious area must be captured and treated.
10. The DA and impervious area values are not shown consistently between the supplement form,
SWU-101, and the calculations. Please revise to all be consistent.
11. The supplement form shows an 8" orifice, but the plans and calculations show a 15" orifice.
Please make consistent.
12. Please provide a planting plan for the pond as required.
13. A permanent drainage easement must be provided.for the pond.
14. Please fill-in the items left blank in the elevation data on the supplement form.
i5. The post -development 1-yr, 24-hr discharge rate shown on the supplement is not consistent vvitii
the calculations.
16. The clean out depth reading for the forebay;on,he O&M form appears to be incorrect.
17:.�Please provide supporting calculations for the F design storm and thCdraw down time for the
1''_ storm. The 1" design storm must draw down in 2 to 5 days. The head used is also incorrect.
Please use H/3 as shown in the BMP Manual.
18. Please, provide a table of elevations, areas, incremental volumes, and cumulative volumes for
the forebay, the main pool, and the total pond. It should include areas and volumes at key
elevations such as PPE, the 1" storm elevation, and TPE.
1 s'. The weir from the forebay to the main pool is 3' above PPE. Typically the elevation of the weir-"'
should be approximately +/- 0.5' the PPE. Also, provide information to show that the weir .will
be stable without the use of riprap or other.
20,, Please provide a hardened spillway detail for the pond.
21. The invert of the pipe discharging into the forebay is below the bottom elevation of the forebay.
22. The bottom elevations of the pond are not consistent between the plans and cross -sections.
23. Provide calculations to show that the outlet swale from the pond will be non -erosive for the 10-
yr storm.
24. Provide riprap apron sizing calculations.
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;Mr. Joe E. Godwin, Sr., PE
SW6100701 — Traemoor Connection
July 12, 2010
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to August 13, 2010, or the application
will be returned as incomplete. The return of a project will necessitate resubmittal of all required items,
including the application fee.
If you need additional time to submit the information, please mail, fax, or email your request for a time
extension to the Division at the address and fax number at the bottom of this letter. The request must
indicate the date by which you expect to submit the required information. The Division is allowed 90 days
from the receipt of a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an approved
Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement
action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number SW6100701 on all correspondence. 1f you have any
questions concerning this matter please feel free to contact me at [phone], or
[e-mail].
Sincerely,
Robert D. Patterson, PE
Environmental Engineer
Storrnwater Permitting Unit
cc: Jackie.Hairr— HCC INVESTMENTS, LLC
Fayetteville Regional Office — Mike Lawyer
DWQ Central -Files
SW6100701 File
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