20030989 Ver 2_More Info Letter_20070220

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
February 20, 2007
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
William Goodwin Associates, LLC
2718 Rock Quarry Road
Raleigh, NC 27610
DWQ Project # 03-0989, Ver. 2
Wake County
Subject Property: Farmington Woods -Phases 13-15
Ut to Big Branch [030402, 27-34-11, C, NSW]
REQUEST FOR MORE INFORMATION
Dear Sir or Madam:
On February 1, 2007, the Division of Water Quality (DWQ) received your application dated
January 31, 2007, to impact 128 linear feet of intermittent stream and 0.00 square feet of Zone l
Neuse River basin protected riparian buffers and 0.00 square feet of Zone 2 Neuse River basin
protected riparian buffers to construct the proposed residential subdivision. 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 have to
move toward denial of your application as required by 15A NCAC 2H .0506 and will place this
project on hold as incomplete until we receive this additional information. Please provide the
following information so that we may continue to review your project.
Additional Information Requested:
1. Please show all stream impacts including fill slopes on the site plan.
2. Please indicate the location of the protected buffers as overlays on the site plan, clearly
showing Zone 1 and Zone 2.
3. Please show cross section details showing the provisions for aquatic life passage.
4. Please provide documentation that DWQ or Forest Resources has made
intermittent/perennial stream determinations on the site or contact DWQ to schedule
intermittent/perennial stream determinations on the site.
401 Oversight/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] /Internet: httn•//h2o enr state nc us/ncwetlands
Noe Carolina
~turatly
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William Goodwin Associates, LLC
Page 2 of 3
February 20, 2007
Under Condition Number 4 of GC 3402, the DWQ can require stormwater management
plans for developments that have, or are anticipated to have, 30% or greater of impervious
surface area within an NSW watershed. Furthermore, it is the DWQ's policy that areas of
concentrated development within a project must treat stormwater runoff. Please provide
calculations showing the percent imperviousness of the drainage areas to each of the
proposed dry detention basins. The impervious surface coverage given in the Diehl &
Phillips, PA letter of January 31, 2007 allows only an average of 1,225 square feet per lot
for houses and patios and only 450 square feet per lot for driveways or walks. If these
limits are necessary to keep impervious surface below 30 percent, then each lot will be
required to have impervious surface limits formalized in a deed restriction.
6. If any of the drainage areas to the proposed dry detention basins exceed 30 percent
imperviousness, then the DWQ will require those drainage areas be treated by stormwater
BMPs appropriate for NSW watersheds in accordance with GC 3402. This means that the
dry detention basin will need to be replaced by either an extended detention stormwater
wetland, a bioretention area, or a wet detention pond followed by a level spreader and
forested filter strip.
7. Please show detailed plans and profiles for all proposed stormwater management devices.
8. Please submit worksheets for all dry detention basins that are proposed on the site. The
worksheet forms can be found on the DWQ's web site at:
http://h2o.enr.state.nc.us/ncwetlands/dr de~twk.~df.
9. The slopes in the vicinity of the scour holes proposed at the outlets of dry detention basins
5 and 6 are too steep for this BMP. Please replace these scour holes with properly designed
level spreaders.
10. The slopes in the vicinity of the level spreaders proposed at the outlets of dry detention
basins 7, 8 and 9 are too steep for a single level spreader. Please either place level
spreaders in series to achieve diffuse flow or provide a properly designed stormwater
management facility to control nitrogen and attenuate flow before stormwater is
discharged.
11. The existing buffer conditions for the level spreaders proposed at the outlets of dry
detention basins 7 and 9 appear to be wooded, requiring 65 feet of level spreader length per
cfs of flow. No photo of existing conditions has been included for level spreader 8. The
DWQ cannot complete its review of level spreader 8 without a photo showing the existing
condition of the buffer.
Please contact the DWQ within three weeks of the date of this letter to verify that you have
received this letter and that you remain interested in continuing to pursue permitting of your
project and will be providing the DWQ the requested information at a later date. Please contact
me in writing and Mike Horan of the DWQ Raleigh Regional Office. If we do not hear from you

William Goodwin Associates, LLC
Page 3 of 3
February 20, 2007
within three weeks, we will assume that you no longer want to pursue this project and we will
consider the project as withdrawn.
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 li e to set up a meeting
to discuss this matter. ~ i
Si ere 'y,
Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBK/ijm
cc: Mike Horan, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Central Files
Nicole Thomson, S&EC, P.A., 11010 Raven Ridge Road, Raleigh, NC 27614
Filename: 030989Ver2FarmingtonWoodsPhasesi3_15(Wake)On_Hold