20070624 Ver 1_Year 1 Monitoring Report_20090112

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Naw al Resource
Reston ation & Conservation
January 9, 2009
Cyndi B. Karoly, Manager
401 Oversight/Express Permit Review Program
1650 Mail Service Center
Raleigh, NC 27699-1650
SUBJECT: Jarmans Oak Mitigation Site
ATTENTION: Eric Kulz
Cyndi/Eric:

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The following information is provided in response to your December 15, 2008 letter in which
you asked for (1) clarifications about data in Table 1 of the Year-1 monitoring report, and (2)
descriptions and conditions of the braided channel restoration and the water quality depressional
wetlands.
You are correct. Some of the information in Table 1 was erroneous. Here are the corrections:
Table 1. Site Restoration Structures and Objectives
Reach Identification Station Range Mitigation Type Quantities Mitigation Units
Main Tributary 10+00- 58+02 S Restoration/P-1 4802 if 4802 SMUs
Southern UT (east) -- S Restoration/P-1 620 If 620 SMUs
Southern UT (west) 10+00 -17+97 S Restoration/P-1 7971f 797 SMUs
-- -- S Enhancement II 1205 if 482 SMUs
Riverine Wetlands -- W Restoration 11.0 ac 11.0 WMUs
Riverine Wetlands -- W Enhancement 6.1 ac 3.05 WMUs
Mitigation Unit Summaries
Stream 6701 SMUs
Riverine Wetland 14.05 WMUs
' Fit Friorlty 1
Braided Channel Discussion
Restoration of the braided reach of the eastern southern tributary entailed minimal channel
excavation, with the channel averaging approximately 0.3 to 0.5 feet in depth, as designed based
on evaluations of reference reaches in the area. The reference reaches are braided, D-type
streams in similar landscape positions with low-gradient valleys and no defined stream channels.
Success criteria within the restored braided stream reach should meet criteria outlined in Section
2.3.1 (Wetland Success Criteria) (USACE et al. 2007). The braided stream reach is developing
Pilot Mill • 1101 Haynes St., Suite 211 • Raleigh, NC 27604 • www.restorationsystems.com • Phone [phone] • Fax [phone]

Cyndi Karoly, NCDWQ
January 9, 2009
Page 2
as anticipated without intervention. Developing riparian vegetation and hydrology adjacent to
the braided stream reach mimic conditions within riverine wetland restoration areas of the Site,
which have met riverine wetland success criteria during the Year 1 (2008) monitoring period.
United States Army Corps of Engineers (USACE) and North Carolina Department of
Environment and Natural Resources. 2007. Information Regarding Stream Restoration
in the Outer Coastal Plain of North Carolina, Version 2 (Draft). United States Army
Corps of Engineers, Wilmington District, Regulatory Division and North Carolina
Department of Environment and Natural Resources, Division of Water Quality.
Marsh Depression Discussion
Marsh treatment areas were included with the Site construction near the mouth of two ditches
prior to entering the upper main tributary and mid-western southern tributary. These areas
consist of shallow (created) wetland depressions within the floodplain. The shallow depressions
provide BMP-type intervention to ensure that initial stormwater pulses must flow into and
through an emergent depressional community before draining into the restored stream channels.
The outfall of each shallow depression is protected from headcut migration through the Site by
rip-rap sills or erosion control fabric at the ditch outfall. Currently these depressions are under
evaluation and minor modifications to them will be undertaken in the near future. Unusual
rainfall activities have resulted in the formation of bypass channels around each depressional
wetland, which allows water to flow directly from ditches into restored stream channel. This
will be corrected in the near future.
Attempts to photograph these features were hampered by the presence of dense stands of tall
perennials which obscured the target devices. Following repairs to these BMPs, photographs
will be taken and sent to you.
Sincerely,
M. Ran 11 Turner
Senior Scientist
cc: Barrett Jenkins, Project Manager
Guy Pearce, NCEEP