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Home My WebLink About20080900 Ver 1_More Info Received_200809152oobogov EcoEngineering A division or The John R. McAdams Company, Inc. September 15, 2008 Ms. Tracy Morris Design and Construction Supervisor North Carolina Ecosystem Enhancement Program 1652 Mail Service Center Raleigh, North Carolina 27699-1652 Re: Addendum 2 - Restoration Plan Meadowbranch Wetland Restoration Project Robeson County, North Carolina DENR Project No.: D0701.7S EEP-06050- Dear Ms. Morris: At the request of EEP, EcoEngineering is submitting this Addendum to the Restoration Plan. Please find attached the updated Wetlands and Vegetation Performance Criteria that were originally submitted with the Restoration Plan. We remain eager to support EEP with any further assistance with this project. Please consider the information contained in the correspondence and contact me at your earliest convenience regarding any aspect of this project. Sincerely, EcoEngineering )nmes ivision of The John R. McAdams Company, I e. 1 M. Halle P.E. Shaun Cavey, E.I. or Project Manager Associate Project Engineer Stormwater and Environmental Department Stormwater and Environmental Department Attachments Research Triangle Park, NC Post Nice Box 1400;) Research I610910 Park, North Carolina 27109 2905 meridian Parkts?ay OmNi n, North Carolina 27713 800-733 5(346 919.287.4262 919-361 -2269 (ax wvav".ecoen()r.rom Design Services Focused On Client Success Meadowbranch Swamp Welland Resonation • USUS I IUC 03040203 Restoration Plan • Robeson County, Norlh Caroiina • September 2008 Meadowbranch Swamp Wetland Restoration Robeson County Addendwn 2 to the Restoration Plan submitted June 18, 2008 Addendum to Section 6.1: The project area will be restored and enhanced as a palustrine riverine floodplain wetland system. The restored wetland will function as a bottomland hardwood forest, but will consist of Cypress-Gum Swamp and Coastal Plain Bottontland Hardwood communities (Schafale & Weakley, 1990) according to reference data. Plant community selection was based on the reference data (Section 4.0). Therefore, the wetlands restored on this project site shall target establishing a wetland with water tables near or at the surface. Additionally, the site will experience overbank flooding events as an important part of its function. The water tables will be monitored by using ten automated groundwater gauges located on the site, Specific performance criteria for the site indicating success shall consist of flood waters reaching the improved road crossings, at an elevation of 112 feet, at least four (4) times per year. An additional monitoring well will be placed within the limits of the restored area of the former logging road to measure the groundwater table. Groundwater table elevations within this area will be deemed successful if water tables are near or at the surface. Performance criteria for hydrology will be based on the reference site (USACE, 2002). Data collected from the reference site indicates that 13 days (6% of the 213 day growing season) was the maximum duration that the water table was within 12 inches of the soil surface during 2007, From January to August 2008, 16 of 150 days (10% of the growing season to date) was the maximum duration that the water table was within 12 inches of the soil surface. In 2007 Lumberton's annual rainfall was 32 inches while a total of 28 inches has already accumulated from January to August in 2008. Lumberton rainfall data was provided by the National Oceanic and Atmospheric Administration's National Weather Service which lists an annual average rainfall amount of 48 inches per year. Based on the reference data collected and the information presented above, the performance criteria for the site shall consist of the water table being within 12 inches of the soil surface continuously for greater than 10% of the growing season under average rainfall conditions (USAGE, 1987), as measured in the restored area of the former logging road. Addendum to Section 6.2: The project area will be planted in targeted areas with species appropriate for the two targeted community types on the site. Areas to be planted include the logging road after its removal and the privet areas after the privet is removed. Most of these areas will be planted as the Coastal Plain Bottomland Hardwood, but one area at the northwest corner of the project area will be planted as Cypress-Gum Swamp. For each community, the vegetation will be monitored on an annual basis to determine survival. Areas of privet will be controlled by aquatic approved herbicides. The trunks and branches will be removed from the site, but the stumps and the soil surface will remain minimally disturbed during the control process. Plants from the appropriate community type will then be planted in these areas. These areas will be reviewed for privet dining subsequent monitoring visits.. FI]EcoEngineering A dii,,i- of-thd.16ha It, McAdm s Colll1wi.'. W. Meadowbranch Swamp Wetland Restoration • USGS I IUC 03040203 Restoration Plan • Robeson County, North Carolina • September 2008 This monitoring process will be conducted in an effort to show the survival of a diverse target community such that the restored site has survival at a density of 320 stems/acre after three years and 260 stems/acre at year five (5), This data will be monitored using sample plots (USACE, 2003) and in accordance with the most recent version of the EEP document entitled "Content, Format, and Data Requirements for EEP Monitoring Reports". In addition, the areas being controlled for privet will be assessed during monitoring for the return of privet. If the privet returns in a quantity that threatens the targeted plants, then corrective actions will need to be taken. 2 F=I]EcoEngineering A dkimon orl'hc kho K. ?1cAAnma Couym»y, Inc.