20010048 Ver 1_Other Agency Comments_20081017

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STATE OF NORTH CAROLINA
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DEPARTIVfNT OF TRANSP®RTA
MICHAEL F EASLEY
GOVERNOR
October 16, 2008
Mr William Wescott
Washington Regulatory Office ACOE
P O Box 1000
Washington, NC 27889-1000
LYNDO TIPPETT
SECRETARI
Re Crescent Road Mitigation Site, Lenoir County, State Project Nos 8 2200101, TIP No
R-2719BA, Action ID No 199911192, DWQ Project No 010048
Mr Wescott
As you are aware, the Department has monitored the Crescent Road Mitigation Site since its
construction in spring of 2002 The site is located in Lenoir County, adjacent to C F Harvey
Road approximately 2 miles northwest of Kinston This 8 50-acre site provides the following
types of mitigation 3 35 acres of nverme wetland restoration, 2,009 linear feet of stream
restoration, and 4 60 acres (200,376 square feet) of Neuse River riparian buffer The entire site
was planted in March of 2002 and hydrologic monitoring gauges were set in May of 2002
NCDOT proposed to monitor the Crescent Road mitigation site for five years or until success
criteria were met, with hydrological, vegetation and stream stability monitoring conducted each
year After each growing season, annual monitoring reports were submitted to the appropriate
regulatory agencies via the Natural Environment Unit's (NEU) website
http //wti1 m, ncdot or /g doh/preconsti-acct/ne%zcu/Monitoring/Monitoi-iii -Reports html
Hydrologic success criteria for the site state that the area must be inundated or saturated (within
12-inches of the surface) by surface of groundwater for at least a consecutive 12 5% of the
growing season Aieas inundated between 50110 and 12 5% of the giowing season can be
classified as wetlands depending upon factors such as the presence of hydrophytic vegetation and
hydnc soils Therefore for the 244-day growing season in Lenoir County, the criterion is a
consecutive 31 days Table 1 provides a summary of the hydrologic data (the percentage of the
growing season that saturation was indicated) at each groundwater gauge location for the past
five years of monitoring
MAILING ADDRESS
NC DEPARTMENT OF TRANSPORTATION
PROJECT DEVELOPMENT AND ENVIRONMENTAL ANALYSIS
1598 MAIL SERVICE CENTER
RALEIGH NC 27699-1598
TELEPHONE [phone]
FAX [phone]
WEBsITE WWW NCDOT ORG
LOCATION
PARKER LINCOLN BUILDING
2728-168 CAPITAL BOULEVARD
RALEIGH NC 27604
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Table 1 Sup nm`arv 6fHvdrolog,c Mon,tonnu T-)atn ')nn'A-')rim
%Monitormg, ` :2003 2004" : _°2005 2006- _'2007
Resti>lts !"4 i ^Results' " KResults -Results Results
CRGW-1 Lq 3 98 160 102 41 0
CRGW-2 94 20 1 176 520 63 9
CRGW-3 242 287 19 3 201 184
Climate Average/ Average/ Average Average Below
Conditions Above Above Rainfall Rainfall Average
Average Average Rainfall
Rainfall Rainfall
After five years of vegetation monitoring, data for 2007 shows that the site has met vegetative
success criteria by yielding an average density of 377 trees per acre surviving, well above the
minimum requirement of 260 trees per acre Individual annual monitoring data is provided
within the monitoring reports available on NEU's website between 2003 and 2007
After four years of stream stability monitoring, data for 2007 shows that all nine cross sections
located within both of the reaches of the Unnamed Tributary to Briery Run remain stable with
little difference during the monitoring timeframe According to information provided by the US
Geological Survey, the Crescent Road stream site has also met the required protocols for
hydrology as it relates to bankfall events
Based on the wetland and stream momtonng results, NCDOT requests that the resource agencies
consider close-out of this site Upon approval, please provide NCDOT with written
documentation stating that no further monitoring is required If you have any questions about
this project, please contact Mr Randy Griffin at [phone]
Sincerely,
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Philip S Harris, III, P E, Unit Head
PDEA-Natural Environment Unit
cc Mr David Wainwright, DWQ
Mr Travis Wilson, WRC
Ms Kathy Matthews, EPA
Mr Gary Jordan, USFWS
Mr David Hams, P E, NCDOT-REU
Mr Jay Johnson, NCDOT-DEO