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HomeMy WebLinkAbout20040275 Ver 5_I-2304A Yadkin River Wetland - Year 4 Report_20190320AN N UAL REPORT FOR 2018 Yadkin River Wetland Mitigation Site Rowan County TIP No. I-2304A COE Action ID: SAW-1998-21203 DWR Project #: 2004-0275 v.5. Prepared By: Environmental Analysis Unit & Roadside Environmental Unit North Carolina Department of Transportation July 2018 TABLE OF CONTENTS SUMMARY...........................................................................................................1 1.0 Introduction ...............................................................................................2 .1 Project Description .........................................................................2 .2 Purpose .........................................................................................2 .3 Project History ................................................................................2 .4 Debit Ledger ....................................................................................3 2.0 Vegetation :................................................................................................5 .1 Success Criteria .............................................................................5 .2 Description of Species .....................................................................5 .3 Results of Vegetation Monitoring ....................................................6 .4 Conclusions ....................................................................................6 3.0 Overall Conclusions and Recommendations .............................................7 FIGURES Figure1 — Vicinity Map ........................................................................................4 APPENDICES Appendix A— Site Photos and Site Map SUMMARY The Yadkin River Wetland Mitigation Site is located in Rowan County. The site was planted in January 2014 and was designed as wetland mitigation for impacts associated with TIP project I-2304A. The mitigation encompasses approximately 2.74 acres total of riverine bottomland hardwood wetland restoration at the Yadkin River Wetland Mitigation Site by removing the existing roadway fill. The mitigation effort involved ripping and re-vegetating the area that is being restored. The area that was restored is being monitored with vegetation plots and photo points for survival of planted seedlings. No hydrologic monitoring is required for this project; however, vegetation monitoring is required for five years. There were two vegetation monitoring plots established throughout the 2.74 acre site. After the fourth year of monitoring, the 2018 vegetation monitoring of the site revealed an average tree density of 663 trees per acre. NCDOT proposes to continue vegetation monitoring at the Yadkin River Wetland Mitigation Site in 2019. � 1.0 INTRODUCTION 1.1 Project Description The Yadkin River Wetland Mitigation Site is located adjacent to the I-85 overpass of the Yadkin River in Rowan County. The site consists of approximately 2.74 acres of riverine wetland mitigation for wetland impacts associated with TIP project I-2304A. 1.2 Purpose In order for a mitigation site to be considered successful, the site must meet vegetation success criteria. This report details the vegetation monitoring in 2018 at the Yadkin River Wetland Mitigation Site. Hydrologic monitoring was not required for the site. 1.3 Project History January 2014 July 2015 June 2016 June 2017 June 2018 Site Planted Vegetation Monitoring (Year 1) Vegetation Monitoring (Year 2) Vegetation Monitoring (Year 3) Vegetation Monitoring (Year 4) 2 1.4 Debit Ledger River Mitigation As Built Site name Site TIP HUC Basin Division Count T e Notes Quantit Available Debit Debit Debit Yadkin River I-2304A Site 2 I-2304A Site 2& Brid e I-2304A 3040103 Yadkin 9 Davidson/Rowan Ri arian Second Mod I-2304A Site 3-12 First Mod 2.74 0 0.16 1.07 1.51 Note: Debit ledger information up to date as of July 30, 2018. The on-site mitigation for I-2304A offset impacts of 2.74 acres at a 1:1 ratio. _��. � �f�f —' � ��c+4������•"4r �"�� � �� -� ., , . ��M1 , �� .• 4�y� '� + n, . . �� ^ �` �. �� � t r . , ' f +, r X': � �{ - ' _�J#�—f*si,. 4'�"� e�. � ...k� ��` V - q' al � � t" �*,� ,. 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J�_��.� I ��g --CJIJ�'J��IJ�I lJ f: .. __ ..-. - :�_ PROJECT t�icirrirr - i-��o�x � �r--� Yadki� RiuerV�letla�ad P�9itigatia[� Site �`� `� � B�ovra� �ouflty, kJort� �aroli�� UV E I: I �,.�'�' 0 0.�5 0.5 1 Miles `+ _-`� � � � � i � � � i S Figure 1. Vicinity Map 4 2.0 VEGETATION: YADKIN RIVER WETLAND MITIGATION SITE (YEAR 4 MONITORING) 2.1 Success Criteria Mitigation Plan States: NCDOT shall monitor the restoration site utilizing two (2) fifty feet by fifty feet (50' x 50') monitoring plots that will be established upon completion of the site grading and planting. NCDOT shall monitor the site for a minimum of five years or until the site is deemed successful. A 320 stems per acre survival criterion for planted seedlings will be used to determine success for the first three years. The required survival criterion will decrease by 10% each year after the third year of vegetation monitoring (i.e. for an expected 290 stems per acre for year 4 and 260 stems per acre for year 5). No specific hydrological monitoring is proposed for this mitigation site. The target elevation will be based on the adjacent wetland elevation and verified during construction. Constructing the site at the adjacent wetland elevation will ensure the hydrology and connectivity of the restored areas are similar to the hydrology in the reference areas. 2.2 Description of Species The following tree species were planted in the Wetland Restoration area: Platanus occidentalis, Sycamore Betula nigra, River Birch Fraxinus pennsylvanica, Green Ash Ulmus americana, American Elm Nyssa sylvatica, Black Gum Quercus michauxii, Swamp Chestnut Oak 2.3 Results of Vegetation Monitoring � � � ^ v � � � � � � � � � � � � y � � a� v '� w � '� e� �,, �..� � � � � V � �, " O � � .� � � � � � � � � � � � � � � � � y � � o �' �' � � > e� a �i �i LJ ~ �% E� E� i� 1 19 3 10 6 38 40 646 2 12 16 12 1 41 41 680 Year 4 Average Density 663 (Trees/Acre) Year 3 Average Density 646 Year 2 Average Density 630 Year 1 Average Density 680 Site Notes: Other species noted onsite included volunteer river birch, sycamore, cottonwood, lespedeza, sweetgum, red maple, woolgrass, Scirpus sp., fennel, stinkweed, tulip poplar, buttonbush, mimosa, Juncus sp., black willow, and various grasses. 2.4 Conclusions There were 2 vegetation monitoring plots established throughout the 2.74 acre site. The 2018 vegetation monitoring of the site revealed an average density of 663 trees per acre for the fourth year of monitoring. C 3.0 OVERALL CONCLUSIONS AND RECOMMENDATIONS The 2018 year represents the fourth year of monitoring activities that have occurred at the Yadkin River Wetland Mitigation Site. The site must demonstrate vegetation success for a minimum of five years or until the site is deemed successful. There were two vegetation monitoring plots established throughout the 2.74 acre site. The 2018 vegetation monitoring of the site revealed an average density of 663 trees per acre. NCDOT will continue vegetation monitoring at the Yadkin River Wetland Mitigation Site in 2019. � APPENDIX A SITE PHOTOS and SITE MAP Yad ki n River Wetland M itigation Site �° M1 �_v�� �� T � � C :1!. � � d d� �{� .v ' ' c,y4, _;.. �� �, �i��,�t �'"� � . � r•� T 5��i�9 f 1` • yY' d r , r. 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