Friedburg Marsh Mitigation Site

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14
ANNUAL REPORT FOR 2002
Friedburg Marsh Mitigation Site
Forsyth County
Project NO. 6.628001T
TIP No. R-2247
Prepared By:
Office of Natural Environment & Roadside Environmental Unit
North Carolina Department of Transportation
December 2002
TABLE OF CONTENTS
SUMMARY.... .......................................................................................................1
1.0 INTRODUCTION ........................................................................................2
1.1 Project description ........................................................................... 2
1.2 Purpose ........................................................................................... 2
1.3 Project History .... ............................................................................. 4
2.0 HYDROLOGY ............................................................................................4
2.1 Success Criteria .............................................................................. 4
2.2 Hydrologic Description .....................................................................4
2.3 Results of Hydrologic Monitoring ..................... ................................5
2.3.1 Site Data ...............................................................................5
2.3.2 Climatic Data ........................................ ................................9
2.4 Conclusions ..................................................... ................................9
3.0 VEG ETATION ..........................................................................................11
3.1 Results of Vegetation Monitoring .................. .........................11
3.2 Conclusions ............................................. ..........................11
4.0 OVE RALL CONCLUSIONS/RECOMMENDATIONS ..............................12
TABLES/FIGURES/APPENDICES
Table 1. Hydrologic Monitoring: Friedburg Marsh Mitigation Site ........................7
Figure 1. Friedburg Marsh Vicinity Map ............................................................... 3
Figure 2. Friedburg Marsh Monitoring Gauge Locations ......................................6
Figure 3. Friedburg Marsh 2002 Hydrologic Results ............................................8
Figure 4. Friedburg Marsh 30-70 Percentile Graph, Forsyth County, NC ..........10
Appendix A. Depth to Groundwater Plots
Appendix B. Site Photos
SUMMARY
The following report summarizes the monitoring activities that have occurred in
2002 at the Friedburg Marsh mitigation site. Friedburg Marsh was constructed in
winter of 1999 and spring of 2000. Monitoring activities in 2002 represent the
second year of monitoring following construction. The site must demonstrate
hydrologic success during the five-year monitoring period.
Friedburg Marsh is composed of existing wetlands, upland buffer areas, wetland
restoration areas, and wetland creation areas. A total of 12 groundwater
monitoring gauges are installed in the site. There was no planting of trees or
herbaceous species at Friedburg, so vegetation monitoring is not required.
Qualitative visual observations are taken for the existing vegetation.
Hydrologic data indicate that all of the Friedburg Marsh gauge locations met the
hydrology success criteria of 5.0% during the 2002 growing-season. Periods of
inundation/saturation lasted from 6.1 to 26.3 percent of the growing season.
The daily rainfall depicted on the well data graphs is obtained from the NC
Climate Office, Winston-Salem weather station. The historical rainfall data used
in the 30-70 graph was also obtained from the NC Climate Office, Winston-Salem
weather station.
Monitoring will continue for the 2003-growing season.
1.0 INTRODUCTION
1.1 Project Description
The Friedburg Marsh mitigation site, located in southern Forsyth County (Figure
1), is the easternmost known location (in North Carolina) for the bog turtle
(Clemmys muhlenbergii). The southern population of bog turtle is federally listed
as a Threatened Species due to Similarity of Appearance. Due to the diverse
wetland communities at this marsh, the Piedmont Land Conservancy and the
North Carolina Natural Heritage Program consider the site a regionally significant
natural site. The Friedburg Marsh Mitigation Plan calls for the preservation and
enhancement of the existing wetland habitat as well as restoration and creation
of additional bog turtle habitat.
The Friedburg Marsh mitigation site consists of existing wetlands (3.8 acres),
upland buffer (38 acres), and wetland restoration/creation areas (5.7 acres). The
restoration/creation areas were constructed in 1999/2000 to increase hydrology
and improve bog turtle habitat. Construction activities involved filling ditches,
constructing ditch plugs, grading to reflect groundwater profiles, removing
invasive woody vegetation, and installing a new outlet for the upper pond area.
No vegetation planting was conducted.
Friedburg Marsh is located in the Muddy Creek portion of the Yadkin River basin.
This site was created to offset wetland impacts associated with the Winston-
Salem Outer Loop (TIP No. R-2247).
1.2 Purpose
In order to demonstrate successful mitigation, hydrologic criteria must be met
during the five years of monitoring. The following report details the results of
hydrologic monitoring during the year 2002 at the Friedburg Marsh mitigation
site.
Year 2002 is the second year of monitoring following site development in 2000.
Included in this report are analyses of hydrology and vegetation monitoring
results as well as local climate conditions throughout the growing season.
2
4 Figure 1. Friedburg Marsh Vicinity Map
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1.3 Project History
May 1997
November 1997
1999
Winter-Spring 2000
March 2000
March-November 2001
July 2001
March-November 2002
August 2002
2.0 HYDROLOGY
2.1 Success Criteria
Feasibility Study Conducted
Site purchased by NCDOT, Initial
Monitoring wells installed.
Mitigation Plan developed
Grading and Construction
Additional monitoring wells installed
Hydrology Monitoring (Year 1)
Vegetation Monitoring (Year 1)
Hydrology Monitoring (Year 2)
Vegetation Monitoring (Year 2)
The success criteria for hydrology states that wetland hydrology will be
established when water inundates or saturates (within 12 inches of the surface)
the mitigation area consecutively for 5.0 percent of the growing season.
The growing season in Forsyth County begins March 28 and ends November 10
(228 days). These dates correspond to a 50 percent probability that
temperatures will drop to 28F or lower after March 28 and before 10 November
(Soil Survey of Forsyth County, 1976, p63). The 5.0 percent of the growing
season stipulated in the success criteria translate to 12 consecutive days of
inundation or saturation.
Local rainfall must be within normal limits to qualify hydrology as successful.
2.2 Hydrologic Description
RDS WL40 and WL20 units record all groundwater and surface water data
(Figure 2). Depth to groundwater is recorded daily. The RDS units are
downloaded in the field on a monthly basis. In November 1997 six groundwater
gauges were installed at Friedburg Marsh to monitor pre-construction hydrology
and develop a mitigation plan, of which one gauge location (S2C9913) was
installed to record surface water and groundwater depths. Following construction
six additional groundwater gauges were installed, of which one gauge location
(2139BB) was installed to record surface water and groundwater depths.
4
2.3 Results of Hydrologic Monitoring
2.3.1 Site Data
The maximum number of days that the groundwater was within twelve inches of
the surface was determined for each gauge. This number was then converted
into a percentage of the 228 day growing season (March 28 - November 10).
The results are presented in Table 1 and Figure 3.
Appendix A contains a plot of the groundwater depth for each gauge. The
maximum number of consecutive days and percentage of growing season of
inundation/saturation is noted on each plot. The individual precipitation events,
shown on the monitoring gauge graphs as bars, represent data provided by the
NC Climate Office.
Figure 3 represents a graphical representation of the hydrologic results. Gauges
highlighted in blue indicate wetland hydrology for more than 12.5% of the
growing season. Gauges highlighted in red show hydrology between 8% and
12.5% of the season, while those in green indicate hydrology between 5% and
8% of the season. Gauges highlighted in black indicate no wetland hydrology
(less than 5% of the growing season).
During the summer of 2002, a meeting was held with DOT Division personnel to
discuss the leaking riser in the old pond. Due to the exceptionally dry summer it
could not be determined if the riser was leaking. The riser will be monitored this
winter and repaired if a leak is discovered.
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Table 1. Hydrologic Monitoring: Friedburg Marsh Mitigation Site
Monitoring: ' <5% 5%-8% 8% 12.5% >12.5% Actual %. , Success Dates
Gauge
S2C9913 ? 10.1 March 28-April 19
Oct 29-Nov 10
S213FD4 ? 13.2 Oct 12-Nov 13
S213F71 ? 12.3 March 28-April 11
Oct 14-Nov 13
S1 EC9E2 ? 26.3 March 28-May 26
Aug 26-Sept 8
Sept 15-Oct 7
Oct 11-Nov 13
S213E88 ? 25.4 March 28-May 24
Oct 16-Nov 13
S2139BB ? 24.6 March 28-May 22
Oct 12-Nov 13
S50446C ? 18.7 March 28-May 9
Oct 16-Nov 13
S4940FC ? 5.7 Oct 29-Nov 13
S31F7FE ? 14.5 March 28-April 29
Oct 16-Nov 13
S41010238 ? 6.1 March 28-April 10
Oct 29-Nov 13
S49411 F ? 5.3 Oct 30-Nov 13
S60417A ? 11.8 Oct 15-Nov 13
Specific Gauge Problems:
• S2139BB: The gauge experienced data loss (August 21 to September 30)
due to gauge malfunction.
• S50446C: The gauge stopped recording data (June 26-September 30), and
was replaced.
• S49411 F: The gauges battery was replaced and lost data from (April 18-July
12).
• S50417A: The gauge experienced malfunction from the beginning of the
growing season to July 12, and (August 21-September 30).
Hydrologic data indicates that the site meets the hydrologic criteria. All
monitoring gauge locations were continuously inundated or saturated for more
than 5 percent (12 days) of the growing season.
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2.3.2 Climatic Data
Figure 4 represents an examination of year 2002 rainfall in comparison with
historical rainfall data in order to determine whether 2002 was "average" in terms
of precipitation. The historical rainfall data was collected from 1971 through 2002
(30 years). All rainfall data was collected from the NC Climate Office, Winston
Salem weather station.
The monthly rainfall totals for the period of November 2001 through October
2002 are shown in Figure 4. The data for this period shows rainfall within
average limits for four months (January, March, June, and September) and below
average limits for four months (February, April, May, and August). July and
October experienced above average rainfall.
2.4 Conclusions
The year 2002 is the second growing season that the monitoring gauges have
been in place post construction. All Friedburg Marsh gauge locations exceeded
the five percent hydroperiod criteria. Gauge locations with shortened
hydroperiods (below 12.5 percent) were located in creation areas where
compacted soil may be preventing infiltration. The installation of surface water
gauges in these areas may demonstrate that inundation is occurring.
Hydrologic monitoring of the Friedburg Marsh mitigation site will continue for the
2003-growing season.
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3.0 VEGETATION: FRIEDBURG MARSH
(YEAR 2 MONITORING)
3.1 Results of Vegetation Monitoring
No planting of trees or herbaceous species was undertaken as part of the
Friedburg Marsh mitigation. As a result, no quantitative vegetation monitoring is
required. Qualitative observations of common species have been made in
conjunction with hydrologic monitoring.
The following species are found in the creation/restoration area, Spike rush,
pickerelweed, bulrush, Juncus sp., alder, cattail, poplar, and green ash are the
more wet tolerant species. Also found were; foxtail, broomsedge, beggar's ticks,
barnyard grass, goldenrod, sweetgum, and multi-flora rose. The presence of
these species in these areas has not affected the overall quality of the bog turtle
habitat at Friedburg Marsh.
3.2 Conclusions
The vegetation in the restoration/creation areas is dominated by wetland plant
species and includes a variety of other species as well.
NCDOT will be coordinating with Dennis Herman of the NC Museum of Natural 7
History.this spring. His recommendations on vegetation enhancement will be
implemented by NCDOT.
NCDOT will continue visual vegetation monitoring at the Friedburg Marsh
Mitigation Site.
11
4.0 OVERALL CONCLUSIONS/RECOMMENDATIONS
• All groundwater gauges in Friedburg Marsh met the hydrologic
success criteria.
• The riser and dam of the old pond will be monitored this winter andl
repaired if necessary.
• Vegetation in the restoration areas is dominated by wetland plant
species.
• Vegetation in the creation areas is currently dominated by upland
plant species.
• NCDOT will continue to monitor the site for hydrologic success.
• NCDOT will be coordinating with Dennis Herman of the NC
Museum of Natural History this spring. His recommendations on
vegetation enhancement will be implemented by NCDOT.

12
APPENDIX A
DEPTH TO GROUNDWATER PLOTS
Photo 1
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Photo 2

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