20071998 Ver 1_More Info Received_20080102

ENVIRONMENTAL SERVICES, INC.
524 S. NEW HOPE ROAD
RALEIGH, NORTH CAROLINA 27610
919-212-1760 • FAX [phone]
www.environmentalservicesinc.com
December 27, 2007
Ms. Cyndi Karoly
N.C. Division of Water Quality
401/ Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
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JAN 2 2008
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Ms. Lauren Witherspoon
N.C. Division of Water Quality
Raleigh Regional Office
3800 Barrett Drive
Raleigh, NC 27609
Re: Hotel Sierra: The Market at Perimeter Park, Morrisville, NC
DWQ Project No. 2007-1998
Ms. Karoly & Ms. Witherspoon:
Environmental Services, Inc., (ESI) is providing this information on behalf of Duke
Construction pursuant to your letter dated 18 December 2007. Duke Construction is
applying for authorization from DWQ to impact a portion of the riparian buffer
associated with a tributary to Stirrup Iron Creek. Your recent letter requested additional
information for three (3) items. I have included your concerns below followed by the
applicant's response.
1.) Provide documentation that the proposed scour hole will provide diffuse flow.
The DWQ BMP manual states that the slopes must not exceed 4%.
The project engineer [ANC Engineering, Inc.] was able to shift the location of the low
flow outlet and scour hole to a new location where the natural slope to the adjacent
stream bank is less than 4%. The attached figures depict the new location. This
revision should satisfy DWQ's concerns regarding the scour hole and slope.
2.) The proposed mulch path is currently proposed in both Zones 1 and 2. Please
reconfigure to show the mulch path in Zone 2 only.
The project engineer and the applicant have agreed to reconfigure the proposed mulch
path to avoid Zone 1 impacts. The revised location is depicted on the attached
FLORIDA • GEORGIA • NORTH CAROLINA • SOUTH CAROLINA

ENVIRONMENTAL SERVICES, INC.
drawings. Zone 2 impacts resulting from the proposed mulch path now tota12,370
feetz (0.05 acre). No impacts to Zone 1 are proposed to result from the new mulch
path location.
3.) The detention pond outlet will need to be moved from the buffer. Please
reconfigure your plan sheet to show this change.
The project engineer has moved the outlet to be just outside the riparian buffer. The
necessary bypass ditch for the 10-year storm event must remain in the buffer and is
depicted on the attached figures. Buffer impacts resulting from the bypass ditch
include the following: Zone 1 = 310 ftz; Zone 2 = 350 ftz.
I trust that this information will allow DWQ to continue processing this request from
Duke Construction. Please contact me if you have any questions or comments. Thank
you for your assistance.
Sincerely,
Environmental Services, Inc.
d-~~
Jeff Harbour
Asst. Vice President
Cc: Brian King
Brad Rhinehalt
Enclosures: revised permit drawings

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