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HomeMy WebLinkAbout20081844 Ver 1_Year 4 Monitoring Report_20090806ANNUAL WETLAND MONITORING REPORT YEAR 4 (2009) GATLIN SWAMP WETLAND RESTORATION SITE MARTIN COUNTY, NORTH CAROLINA (Contract # D05024 -2) Prepared for: NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES ECOSYSTEM ENHANCEMENT PROGRAM RALEIGH, NORTH CAROLINA l � i21S(Q13b;:ft� %S71SSL'CV3Ilgtl Amri Emhormenral; Inc. Restoration Systems, LLC Axiom Environmental, Inc. 1101 Haynes Street, Suite 211 And 20 Enterprise Street, Suite 7 Raleigh, North Carolina 27604 Raleigh, North Carolina 27607 July 2009 ' 'IN1y yam^ Prepared for: NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES ECOSYSTEM ENHANCEMENT PROGRAM RALEIGH, NORTH CAROLINA l � i21S(Q13b;:ft� %S71SSL'CV3Ilgtl Amri Emhormenral; Inc. Restoration Systems, LLC Axiom Environmental, Inc. 1101 Haynes Street, Suite 211 And 20 Enterprise Street, Suite 7 Raleigh, North Carolina 27604 Raleigh, North Carolina 27607 July 2009 EXECUTIVE SUMMARY Restoration Systems, L.L.C. (Restoration Systems) has completed restoration of nonriverine wetlands at the Gatlin Swamp Wetland Restoration Site (hereafter referred to as the "Site ") to assist the North Carolina Ecosystem Enhancement Program (EEP) in fulfilling restoration goals in the region. The Site is located approximately 1.5 miles southwest of Oak City, in Martin County. The Site encompasses approximately 150.2 acres of land situated in an expansive interstream flat characterized primarily by timber production and agriculture. The project provides 138.7 acres of non - riverine wetland restoration, with benefits to water quality and wildlife in a watershed that is highly dissected for agriculture and timber production. The Site is located within sub -basin 03 -02 -09 of the Roanoke River Basin. This area is part of United States Geological Survey (USGS) Hydrologic Unit (HU) 03010107 of the South Atlantic /Gulf Region (14 -digit HU 03010107120020). Site features drain to Etheridge Swamp and Conoho Creek, which is a major tributary to the Roanoke River. A Detailed Wetland Restoration Plan was completed for the Site in September 2005. The plan outlined methods designed to restore agricultural fields that had been ditched, drained, and cleared for row crop production. Prior to implementation, the entire 150.2 acre Site contained 138.7 acres of hydric soil that had been effectively drained and contained no jurisdictional wetlands. The Detailed Wetland Restoration Plan outlined restoration procedures including 1) ditch cleaning prior to backfill, 2) depression construction, 3) impervious ditch plug construction, 4) ditch backfilling, 5) floodplain soil scarification, and 6) plant community restoration. The following objectives were proposed to provide mitigation credit requested under the EEP Request For Proposal (RFP) # 16- DO5024 dated October 22, 2004: • Provide 125 acres of nonriverine Wetland Mitigation Units, as calculated in accordance with the requirements stipulated in RFP #16- D05024. • Restore approximately 125 acres of wetland through filling agricultural ditches, removal of spoil castings, eliminating row crop production activities, and /or planting with native forest species. • Protect the Site in perpetuity with a conservation easement which is held by the State of North Carolina. As constructed, the Site provides 138.7 acres of non - riverine wetland restoration and 11.5 acres of forested upland buffer. In summary, the Site achieved the defined (or targeted) success criteria. 1. Saturation (free water) within one foot of the soil surface for a minimum of 5 percent (12 consecutive days) of the growing season, for all Site groundwater gauges in the Fourth Monitoring Year (Year 2009). 2. Vegetation plots across the Site were well above the required 290 stems per acre with an average of 1009 tree stems per acre in the Fourth Monitoring Year (Year 2009). Gatlin Swamp Restoration Site page i Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) TABLE OF CONTENTS EXECUTIVE SUMMARY .......................................................................... ............................... i 1.0 INTRODUCTION .............................................................................. ..............................1 2.0 MONITORING PROGRAM .............................................................. ..............................4 2.1 Wetland Hydrology ......................................................................... ..............................4 2.1.1 Hydrology Monitoring Procedure ............................................. ..............................4 2.1.2 Hydrologic Success Criteria ..................................................... ..............................5 2.1.3 Hydrological Monitoring Results and Comparison with Success Criteria ...............5 2.2 Vegetation ....................................................................................... ..............................6 2.2.1 Vegetation Monitoring Procedure ............................................ ..............................6 2.2.2 Vegetation Success Criteria ...................................................... ..............................6 2.2.3 Vegetation Sampling Results and Comparison to Success Criteria .........................8 3.0 CONCLUSIONS ................................................................................ ..............................8 4.0 REFERENCES .................................................................................. .............................11 LIST OF TABLES Table 1. 2009 (Year 4) Groundwater Gauge Results ..................................... ..............................6 Table 2. Character Tree Species ................................................................... ..............................7 Table 4. Summary of Groundwater Gauge Results ....................................... ..............................8 Table 3. 2009 Vegetation Monitoring Data and Results ................................ ..............................9 Table 5. Summary of Vegetation Plot Results .............................................. .............................10 LIST OF FIGURES Figure1. Site Map ........................................................................................ ..............................2 Figure2. Monitoring Plan ............................................................................ ..............................4 APPENDICES Appendix A. 2009 Groundwater Gauge Data Appendix B. Vegetation Plot Photographs Gatlin Swamp Restoration Site page ii Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) GATLIN SWAMP WETLAND RESTORATION SITE ANNUAL MONITORING REPORT YEAR 4 (2009) MARTIN COUNTY, NORTH CAROLINA 1.0 INTRODUCTION Restoration Systems established the Gatlin Swamp Wetland Restoration Site (Site) in the Coastal Plain region of the Roanoke River Basin (14 -digit HU 03010107120020). The Site is located approximately 1.5 miles southwest of Oak City, in Martin County (Figure 1). The Site encompasses approximately 150.2 acres of land situated in an expansive interstream flat characterized primarily by timber production and agriculture. The project offers 138.7 acres of nonriverine wetland restoration, with benefits to water quality and wildlife in a watershed that is highly dissected for agriculture and timber production. A Detailed Wetland Restoration Plan was completed for the Site in September 2005. The plan outlined methods designed to restore agricultural fields that had been ditched, drained, and cleared for row crop production. Prior to implementation, the entire 150.2 acre Site contained 138.7 acres of hydric soil that had been effectively drained and contained no jurisdictional wetlands. The Detailed Wetland Restoration Plan outlined restoration procedures including 1) ditch cleaning prior to backfill, 2) depression construction, 3) impervious ditch plug construction, 4) ditch backfilling, 5) floodplain soil scarification, and 6) plant community restoration. The following objectives were proposed to provide mitigation credit requested under the EEP Request For Proposal (RFP) #I 6-DO5 024 dated October 22, 2004: • Provide 125 acres of nonriverine Wetland Mitigation Units, as calculated in accordance with the requirements stipulated in RFP #I 6-DO5024. • Restore approximately 125 acres of wetland through filling agricultural ditches, removal of spoil castings, eliminating row crop production activities, and /or planting with native forest Spec ies. • Protect the Site in perpetuity with a conservation easement which is held by the State of North Carolina. As constructed, the Site provides 138.7 acres of non - riverine wetland restoration and 11.5 acres of forested upland buffer (Figure 2). Upon completion of the detailed restoration plan, construction schematics were developed and construction was initiated in October 2005. Anderson Farms completed earthwork and grading at the Site in December of 2005. Carolina Silvics completed planting of the Site in January 2006. Axiom Environmental, Inc. completed as -built mitigation plans and as -built construction drawings in January 2006. Gatlin Swamp Wetland Restoration Site page 1 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) i w r '�.,._ Rn ' -` �-. - rte. - ®�(• _ __. � Pt ._ _ � " '9 Reference Hydrology -<7 and Soils Area ' Reference Vegetative M. . Community Area A. s �1 Site Location {4 M... E - \Yr / AR 0 1 mi. 4 mi. 1:158,400 - . Source: 1977 North Carolina Ades and Gazetteer, p.43. Dwn. by: CLF FIGURE 'NlAowpSprings,NC277592 SITE LOCATION Ckdby: WGL 215-IM GATLIN SWAMP WETLAND RESTORATION SITE Date: Aft 11 Is1s� 34 ^ -3s3s fax June 2008 w.�i..r Martin County, North Carolina Project: 08 -007 Information on project managers, owners, and contractors follows: Owner Information Restoration Systems, L.L.C. George Howard and John Preyer 1101 Haynes Street, Suite 211 Raleigh, North Carolina 27604 (919) 755 -9490 Designer Information Earthwork Contractor Information Axiom Environmental, Inc. Anderson Farms W. Grant Lewis Gary Wilkerson and Richard Anderson 20 Enterprise Streeet, Suite 7 179 NC 97 East Raleigh, North Carolina 27607 Tarboro, North Carolina 27886 (919) 215 -1693 (252) 823 -4730 Plantine Contractor Information Carolina Silvics Dwight McKinney 908 Indian Trail Road Edenton, North Carolina 27932 (919) 523 -4375 2.0 MONITORING PROGRAM The Site monitoring protocol consists of a comparison between reference and restoration areas along with evaluation of jurisdictional wetland criteria (Environmental Laboratory 1987). Monitoring will entail analysis of two primary parameters: hydrology and vegetation. Monitoring of restoration efforts will be performed for a minimum of 5 years or until success criteria are fulfilled. The monitoring program is described below. 2.1 Wetland Hydrology 2.1.1 Hydrology Monitoring Procedure After hydrological modifications were completed at the Site, continuously recording monitoring gauges were installed in accordance with specifications outlined in Installing Monitoring Wells /Piezometers in Wetlands (NCWRP 1993). Monitoring gauges were set to a depth of approximately 24 inches below the soil surface. Screened portions of each gauge were surrounded by filter fabric, buried in a sand screen, and sealed with a bentonite cap to prevent siltation and surface flow infiltration during floods. Five monitoring gauges were installed in wetland restoration areas to provide representative coverage of the Site (Figure 2). Two gauges were also placed in a reference area in similar landscape positions to use as comparison with onsite conditions (Figure 1). Hydrological sampling will be performed in restoration and reference areas during the growing season (March Gatlin Swamp Wetland Restoration Site page 4 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) 16 and November 14) at daily intervals necessary to satisfy the hydrology success criteria within each physiographic landscape area. 2.1.2 Hvdroloaic Success Criteria Target hydrological goals have been developed using regulatory wetland hydrology criteria and reference wetland sites. Regulatory Wetland Hydrology Criteria The regulatory wetland hydrology criterion requires saturation (free water) within 1 foot of the soil surface for 5 percent of the growing season under normal climatic conditions. In some instances, the regulatory wetland hydroperiod may extend between 5 and 12.5 percent of the growing season. Reference Groundwater Modeling The reference groundwater model forecasted the wetland hydroperiod in restoration areas will range between approximately 2 and 26 percent of the growing season in early successional phases. Because wetland hydroperiods during old field stages of wetland development are projected to extend for less than 12.5 percent of the growing season, wetland monitoring plans that extend for a five year period after restoration will utilize a minimum 5 percent wetland hydrology criterion to substantiate restoration success. Reference Wetland Sites Two monitoring gauges were installed in reference wetlands located in the northern and eastern periphery of the Site. Wetland hydroperiods measured by groundwater gauges located within the reference areas will be compared to hydroperiods exhibited by groundwater gauges in the restoration area to further evaluate restoration success. Success criteria outlined by the groundwater model indicates that the wetland restoration area should maintain saturation within one foot of the soil surface for at least 74 percent of the hydroperiod exhibited by the reference wetland gauges in any given year. Under normal climatic conditions, the hydrologic success criterion requires saturation (free water) within one foot of the soil surface for a minimum of 5 percent of the growing season. This hydroperiod translates to saturation for a minimum, 12 -day (5 percent) consecutive period during the growing season, which extends from March 16 and November 14 (244 days) (USDA 1977). In atypical dry years, the hydroperiod must exceed 75 percent of the hydroperiod exhibited by the reference gauges. Reference gauge data will be used to compare wetland hydroperiods between the restoration areas and relatively undisturbed reference wetlands. This data will supplement regulatory evaluation of success criteria and also provide information that will allow interpretation of mitigation success in years not supporting "normal" rainfall conditions. 2.1.3 Hydrological Monitoring Results and Comparison with Success Criteria Hydrographs for each monitoring location are provided in Appendix A along with daily rainfall totals for 2009. Groundwater data presented in Table 1 were collected through July 2' ), 2009 for reference and restoration area gauges. Data will continue to be downloaded monthly until the end of the 2009 growing season (November 14, 2008) and will be available upon request. Gatlin Swamp Wetland Restoration Site page 5 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) All Site groundwater gauges achieved the defined (or targeted) success criteria for hydrology, saturation (free water) within one foot of the soil surface for a minimum of 5 percent (12 consecutive days) of the growing season, in the Fourth Monitoring Year (Year 2009) (Table 1). Table 1. 2009 (Year 4) Groundwater Gauge Results Gauge Max Consecutive Days Saturated During Growing Season (Percentage) * Defined (or Targeted) Success Criteria Achieved 1 43 days (17.6 %) Yes 2 43 days (17.6 %) Yes 3 46 days (18.9 %) Yes 4 44 days (18.0 %) Yes 5 45 days (18.4 %) Yes Ref 1 43 days (17.6 %) Yes Ref 2 48 days (19.7 %) Yes * Gauge data presented in the table were collected through July 23, 2009 for the Gatlin Swamp reference and restoration area gauges. Data will continue to be downloaded monthly for the remainder of the 2009 growing season (until November 14, 2009) and will be available upon request. 2.2 Vegetation 2.2.1 Vegetation Monitoring Procedure Restoration monitoring procedures for "vegetation are designed in accordance with United States Environmental Protection Agency guidelines presented in Mitigation Site Type (MIST) documentation (USEPA 1990) and United States Army Corps of Engineers (USACE) Compensatory Hardwood Mitigation Guidelines (USDOA 1993). The following presents a general discussion of the monitoring program. During the first year, vegetation received visual evaluations on a periodic basis to ascertain the degree of overtopping of planted species by nuisance species. Quantitative sampling was conducted in late summer of the first year. Subsequently, quantitative sampling of vegetation will be performed between June 1 and September 30 of each monitoring year for five years or until the vegetation success criteria are achieved. Five sample transects were installed within planted areas of the Site to equally represent the various hydrologic regimes (Figure 2). Each transect is 600 feet in length and 7.25 feet in width (0.1 acre). Transects were centered on the five groundwater monitoring gauges and are defined by the corresponding gauge number. In each sample plot, vegetation parameters monitored include species composition and species density. Photographs of the five vegetation plots are included in Appendix B. 2.2.2 Vegetation Success Criteria Success criteria have been established to verify that the vegetation component supports community elements necessary for floodplain forest development. Success criteria are dependent upon the density and growth of Character forest species. Additional success criteria are dependent upon density and growth of "Character Tree Species." Character Tree Species include planted Gatlin Swamp Wetland Restoration Site page 6 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) species and species identified through inventory of an approved reference (relatively undisturbed) forest community used to design the planting plan. All canopy tree species planted and identified in the reference forest will be utilized to define "Character Tree Species" as termed in the success criteria. Table 2. Character Tree Species PLANTED SPECIES REFERENCE SITE SPECIES Loblolly Pine (Pinus taeda) Northern Red Oak (Quercus rubra) Pond Pine (Pinus serotina) Red Maple (Acer rubrum) Swamp Chestnut Oak (Quercus michauxii) White Oak (Quercus alba) Cherrybark Oak (Quercus pagoda) Bitternut Hickory (Carya cordiformis) Southern Red Oak (Quercus falcata) Hop Hornbean (Ostrya virginiana) Water Oak (Quercus nigra) Tulip Tree (Liriodendron tulipifera) Willow Oak (Quercus phellos) Sweetgum (Liquidambar styraciflua) Sweetbay (Magnolia virginiana) American Beech (Fagus grandiflora) River Birch (Betula nigra) Mockernut Hickory (Carya tomentosa) American Sycamore (Platanus occidentalis) Ironwood (Carpinus carolinia) Black Walnut (Juglans nigra) Hackberry (Celtis laevigata) Green Ash (Fraxinus pennsylvanica) An average density of 320 stems per acre of Character Tree Species must be surviving in the first three monitoring years. Subsequently, 290 Character Tree Species per acre must be surviving in year 4 and 260 Character Tree Species per acre in year 5. Planted species must represent a minimum of 30 percent of the required stems per acre total (87 stems per acre in year 4). Planted Character Tree Species may serve as a seed source for species maintenance during mid - successional phases of forest development. Each naturally recruited Character Tree Species may represent up to 10 percent of the required stems per acre total. In essence, seven naturally recruited Character Tree Species may represent a maximum of 70 percent of the required stems per acre total. Additional stems of naturally recruited species above the 10 percent and 70 percent thresholds are discarded from the statistical analysis. If vegetation success criteria are not achieved based on average density calculations from combined plots over the entire restoration area, supplemental planting may be performed with tree species listed in the Restoration Plan or observed in the Reference Site. Supplemental planting will be performed as needed until achievement of vegetation success criteria. No quantitative sampling requirements are proposed for herb assemblages as part of the vegetation success criteria. Development of floodplain forests over several decades will dictate the success in migration and establishment of desired understory and groundcover populations. Gatlin Swamp Wetland Restoration Site page 7 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) 2.2.3 Vegetation Sampling Results and Comparison to Success Criteria Quantitative sampling of vegetation was conducted in July 2009. Results are provided in Table 3. Vegetation success criteria for year 4 (290 tree stems per acre) were exceeded for the 2009 annual monitoring year with an average of 1009 tree stems per acre across the Site. Each individual vegetation plot met success criteria with a range of 738 to 1176 tree stems per acre. 3.0 CONCLUSIONS The Site achieved the defined (or targeted) success criteria, with saturation (free water) within one foot of the soil surface for a minimum of 5 percent (12 consecutive days) of the growing season, for all Site groundwater gauges in the Fourth Monitoring Year (Year 2009). A summary of groundwater gauge data for the year 1 (2006) through year 4 (2009) is included in Table 4. Also, vegetation plots across the Site were well above the required 320 stems per acre with an average of 1009 tree stems per acre in the Fourth Monitoring Year (Year 2009) (Table 5). Table 4. Summary of Groundwater Gauge Results Gatlin Swamp Wetland Restoration Site page 8 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) Success Criteria Achieved/Max Consecutive Days During Growing Season Gauge (Percenta e) Year 1 2006) Year 2 (2007) Year 3 (2008) Year 4 2009) Year 5 2010) 1 Yes /56 days Yes /25 days Yes /132 days Yes /43 days, (23 percent) (10 percent) (54 percent) (17.6%) 2 Yes /56 days Yes /25 days Yes /71 days Yes /43 days r (23 percent) (10 percent) (29 percent) (17.6%) sP , 3 Yes /56 days Yes /48 days Yes /88 days Yes /46 days' (23 percent) (20 percent) (36 percent) (18.9%) 4 Yes /56 days Yes /48 days Yes /71 days Yes /44 days 23 percent) 20 percent) 29 percent) (18.0%) 5 Yes / 174 days Yes /99 days Yes /60 days Yes /45 days (71 percent) (41 percent) (25 percent) (18.4%) Ref 1 Yes/ 101 days Yes /68 days Yes /43 days My (41 percent) (28 ,percent) (17.6 %) Ref 2 Yes/ 117 days Yes /66 days Yes /70 days Yes /48 days m (48 percent) (27 percent) (29 percent) (19.7%) < , Gatlin Swamp Wetland Restoration Site page 8 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) Mz wa ao as F O O C13 O ti O O O ac N Em >"r C's E ,u Z3 -0 2 rm E C'4 cd 00 <-- 01 N �c 'ID 00 -4 00 S.2 C14 C, 00 F-4 CC U rq00 0 In "T N �c C14 Ic 00 N N tn 00 00 I!t .11 INC, 1.0 Iz 0 C C\ C) N \0 1- 00 C) "t C� �O N N m 00 cq -I- CA LL M 00 kn tf) r4 00 — Iz, -� -1 0. N [ Fit") 1 C4 00 O N t- 0 7 .p \,c W, T III a 43 c 0 C) U i- u u F- Z w z w ai u 7- y ' n C q A Z U Z U o z 7; m E �5 cc 0 = lw = m Q 0 0 F: E- Q6 06 w > ta -Z at Cd 40 sz C Fz 44 Z: ZC 05 tz cd i A 40 o Ul O ti O O O ac N Em >"r C's E ,u Z3 -0 2 rm E C'4 Table 5. Summary of Vegetation Plot Results Plot Stems /Acre Coun ing Towards Success Criteria Year 1 (2006) Year 2 (2007) Year 3 (2008) Year 4 (2009) Year 5 (2010) 1 770 730 744 1057 ,� W _ _, 2 670 650 664 738 3 640, 900 854 998 t. a ,: swim 4 550 670 874 1 1176 CA a �' '_ 5 680 700 784 1028 ' `" - �' Average of Plots 1 -5 708 736 784 1009 ffigm- Gatlin Swamp Wetland Restoration Site page 10 Annual Wetland Monitoring Report Restoration Systems, LLC Year 4 (2009) 4.0 REFERENCES Environmental Laboratory. 1987. Corps of Engineers Wetland Delineation Manual. Technical Report Y -87 -1. United States Army Corps of Engineers Waterways Experiment Station, Vicksburg, MS. North Carolina Wetlands Restoration Program (NCWRP). 1993. Installing Monitoring Wells/Piezometers in Wetlands (WRP Technical Note HY- IA -3.1). North Carolina Department of Environment, Health, and Natural Resources, Raleigh, North Carolina. United States Department of Agriculture (USDA). 1977. Soil Survey of Martin County, North Carolina. United States Department of Agriculture, Natural Resources Conservation Service. United States Department of the Army (USDOA). 1993 (unpublished). Compensatory Hardwood Mitigation Guidelines. United States Army Corps of Engineers, Wilmington District. United States Environmental Protection Agency ( USEPA). 1990. Mitigation Site Classification (MIST). A Methodology to Classify Pre - Project Mitigation Sites and Develop Performance Standards for Construction and Restoration of Forested Wetlands. USEPA Workshop, August 13 -15, 1989. USEPA Region IV and Hardwood Research Cooperative, North Carolina State University, Raleigh, NC. 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