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HomeMy WebLinkAbout20011032 Ver 1_Monitoring Report_20101216North Carolina State University is a land- Office of Finance and Business Grant university and a constituent institution Environmental Health and Of The University of North Carolina Public Safety Division An Equal Opportunity/Affirmative Action Employer Environmental Health & Safety Center http://www2.ncsu.edu/ehs/ Campus Box 8007 Raleigh, North Carolina 27695-8007 Assoc. Vice Chancellor 919.515.4238 Environmental Affairs 919.515.6859 Industrial Hygiene 919.515.6860 Health and Safety 919.515.6858 Radiation Safety 919.515.2894 Business Continuity 919.515.5201 (Fax) 919.515.6307 December 21, 2010 Eric Kulz NC DENR - Division of Water Quality 401 Wetlands Certification Unit 1650 Mail Service Center Raleigh, North Carol ina27699-1650 C RE%D w"OF01SQUALITY RE: Stormwater Wetland, Stream and Buffer Restoration at the College of Veterinary Medicine and Lake Wheeler Field Lab, DWQ Project # 01-1032 Eric: Please find enclosed one copy of the 2010 Monitoring Report for the above-referenced project. A copy is also being provided to Natalie Landry. If you require additional information or have any questions, please do not hesitate to contact me at 515-6859. Thank you, G Manager, Environmental Affairs Enclosure 2010 Monitoring Report Additional Monitoring Stormwater Wetland at the College of Veterinary Medicine Prepared by: Biological & Agricultural Engineering North Carolina State University Campus Box 7625 Raleigh, NC 27695 November 2010 Table of Contents Table of Contents ........................................................................................................................................ ii Tables and Figures ......................................................................................................................................ii 1.0 EXECUTIVE SUMMARY/ABSTRACT .........................................................................................1 2.0 BACKGROUND INFORMATION .................................................................................................1 2.1 Project Description ........................................................................................................................ l 2.2 Goals and Objectives ..........................................................................................................................1 2.3 Design Summary ................................................................................................................................. l 2.3.1 CVM Site Description and Landuse ............................................................................................1 2.3.3 Proposed CVM Stormwater Wetland .......................................................................................... 2 3.0 Upper Wetland Repair Summary ...................................................................................................... 5 3.1 Vegetation ..................................................................................................................................... 5 4.0 YEAR 2010 RESULTS AND DISCUSSION .................................................................................. 6 3.1.1 Results and Discussion .......................................................................................................... 6 Tables and Figures Table 1. Background Information .............................................................................................................3 Figure 1. Project Location Map ................................................................................................................4 Appendix A. Site Photo Log ..................................................................................................................... 7 Appendix B. Wetland Repair Plans ........................................................................................................11 11 1.0 EXECUTIVE SUMMARY/ABSTRACT This monitoring effort is a sub-project of the larger Stream, Buffer, and Wetland Restoration efforts at NCSU College of Veterinary Medicine and Lake Wheeler. Construction activities at CVM that began in 2007 resulted in a large sediment flux into the stormwater wetland area. The forebay was completely filled and the upper wetland had been impacted. The forebay was cleaned out once in February of 2009. The forebay was cleaned out again in 2010, and the entire upper wetland was re-built and re-graded. The wetland was re- planted in the spring of 2010, and plants were maintained and watered over the summer. This report details and documents the wetland repair activities, and the development of the vegetative community during the first growing season. An additional report is planned annually until construction activity has been completed and the watershed draining toward the wetland stabilized. It is expected that adjacent construction activity will be completed in the summer of 2011. 2.0 BACKGROUND INFORMATION The background information for this report is referenced from previous monitoring reports conducted by ARCADIS and NCSU. 2.1 Project Description ARCADIS was retained by North Carolina State University (NCSU) to prepare design and construction documents for the mitigation project. The CVM project includes a 0.7-acre stormwater wetland and approximately 53,000 square feet of buffer surrounding the stream restoration site and 58,000 square feet of pond buffer restoration at an existing pond immediately downstream of the stream restoration site. 2.2 Goals and Objectives The purpose of the stream restoration, the stormwater wetland, and the buffer restoration is for NCSU to gain mitigation credit for stream impacts caused by previous NCSU development projects. The goal of the project is to improve water quality by reducing sediment from eroding stream banks and by reducing nutrient input through the establishment of a permanent riparian buffers and the stormwater wetland. The buffers will prevent grazing and direct access by cattle to the stream and will improve the stream habitat. 2.3 Design Summary 2.3.1 CVM Site Description and Landuse The CVM project area is along an unnamed tributary to House Creek, an intermittent stream in Wake County, North Carolina. The project is approximately 2,000 feet west of the Hillsborough Street (NC Highway 54) and Interstate 440 intersection in Wake County. Land use surrounding the project area includes residential, commercial, recreational, and industrial. The NCSU property is bounded to the north by the Wade Avenue extension, with the North Carolina Art Museum beyond. Blue Ridge Road is immediately to the west of the NCSU property, with the North Carolina State Fairgrounds beyond. Hillsborough Street borders the property to the south with the North Carolina State Arboretum and commercial properties beyond. East of the veterinary school property is the NCSU faculty club facility, with Interstate 440 beyond. The NCSU CVM Campus is approximately 190 acres, with the project area near the south-central portion of the property. The headwaters of the project stream are almost entirely contained within the research facility. The entire project area is within the Neuse River drainage basin. The upstream limit of the project is at the outfall of an existing 42-inch concrete pipe draining the existing CVM parking lots and associated grounds. The downstream project limit is at the upper end of an existing pond in the center of the campus. 2.3.3 Proposed CVM Stormwater Wetland The stormwater wetland will be located at the upstream limit of the stream restoration project and was designed to treat stormwater runoff from the future developed condition of the watershed. The design was based on the North Carolina Department of Environment and Natural Resources (NCDENR) Stormwater Best Management Practices, the NCSU Cooperative Extension document "Designing Stormwater Wetlands for Small Watersheds, " and the NCSU CVM Stormwater Master Plan. The wetland will begin immediately downstream of the existing 42-inch pipe and will extend along the stream valley approximately 600 feet. The wetland volume and surface area were designed to treat the runoff produced from 1 inch of rainfall over the contributing watershed, assuming fully developed conditions. Based on the NCSU CVM Stormwater Master Plan, the future watershed will consist of 38.1 acres with 18.9 acres impervious area. The wetland will include a normal pool similar to a wet detention pond with a forebay and areas of shallow water, deep pools, shallow land (submerged during storms), and upland (not submerged during storms). A riser-barrel principal spillway was designed to slowly release the outflow allowing treatment of the runoff from the first inch of rainfall. Runoff volumes exceeding that from the first inch of rainfall will flow through an emergency spillway and will bypass the treatment area. Both spillways from the wetland will discharge into the stream. The emergency spillways were designed to accommodate the 100-year storm. Flood routing calculations were performed for the 2-, 10-, 50-, and 100-year storm events using the "chainsaw" method, as described in "Elements of Urban Stormwater Design, " (Malcom 1989). The stormwater wetland design included a planting plan that consists of native species selected with consideration of existing soils, topography, drainage, and the design guidance documents mentioned previously. The planting plan includes a variety of species locally adapted to encourage a diverse natural ecosystem. Included are fringed sedge, waterweed, soft rush, pickerelweed, arrowhead, soft-stem bulrush, and bushy bluestem. 2 Table 1. Background Information Project Name Stormwater Wetland Creation and Stream and Buffer Restoration of Unnamed Tributary to House Creek at the NCSU College of Veterinary Medicine Stream Buffer Restorations at Lake Wheeler Road Field Laboratory Designer's Name Arcadis, Inc 801 Corporate Center Drive Raleigh, NC 27606 Project County Wake County Directions to Project From 1-440 in Raleigh, exit onto Hillsboro Street. Follow toward Site NC Fairgrounds (away from downtown). Vet School will be on the right. Creek begins downstream of stormwater wetlands in field next to Hillsboro Street. Drainage Area 0.059 sq. mi. (upper end) 0.097 s q. mi. (lower end USGS Hydro Unit 03020201 NCDWQ Subbasin 12-33-13 (House Creek) 27-43-5 (Swift Creek Project Length 810 linear feet stream restoration Restoration Approach 810 linear feet of dimension, pattern, and profile 0.7 acre stormwater wetland creation 111,000 square feet of buffer restoration at College of Veterinary Medicine Site 71,000 square feet of buffer restoration at Lake Wheeler Field Road Site Date of Completion Summer 2004 Monitoring Dates October 2004 (as-built survey) December 2005 (MY-01) April 2007 (MY-02) January 2008 (MY-03) December 2008 (MY-04) February 2010 (MY-05) November 2010 (Additional Wetland Monitoring) I3e? Lr i S 3 - V Iryon Rd. J 6 3 I ? C 1 I (? I LAKE WHEELER READ FIELD AB?RATERY SITE a v m 6 O P Q ? 40 ? M s I' Myror?Y-. i- ?- ? \ nclo le i. Wade Ave ?hY[(/ ? - - - s - L Dr 'R?JECT SITE Fac-ul ty w I c? c, i ? t u9a` _ W o Pylon L 9' O N Hutton5 / (/7 O'keuY St. S 1., NCSU C?LLEGE EE VETERINARY MEDICINE SITE COLLEGE OF VETERINARY MEDICINE AND LAKE + srtF Locnnom may - __ ona oac oe/+e?oa WHEELER FIELD LAB WAKF COUNTY, N.C. - FIGURF 1. SITE I OCATION MAP R?oLoWi. l,bc ?-p,,,, %. FNG7625 no,th Cmorlla state I_? eFstm R-,qh, NC 17655 IF-S ore one h 3.0 Upper Wetland Repair Summary NCSU Water Quality Group was hired to manage repair activities for the upper wetland. They worked with NCSU Construction Management and the NCSU Environmental Health and Safety Center to develop a plan to assess the extent of damage, prepare a repair plan, and manage construction activities during repairs. Existing Condition Survey NCSU Water Quality Group staff conducted a topographic survey in the summer of 2009 to determine the extent of sedimentation in the upper wetland. The survey data was be used in combination with soil sampling to estimate the amount of sediment deposited, and to determine the earthwork required to restore design conditions. The survey was later used as a base map for construction schematics and developing the repair plan. Wetland Repair/Redesign A repair plan was developed for the wetland using the latest recommendations and design specifications. A series of schematics were developed to guide grading, soil preparation, and planting activities. The repair required 1200 cubic yards of soil removal to restore proper function of the forebay and wetland, the installation of new topsoil, and minor modification of the outlet structure. The wetland redesign was approved through internal NCSU review and submitted to NCDWQ for approval. This plan was approved in the winter of 2009 and bidding and construction was scheduled for the spring of 2010. The approved plans are provided in an Appendix of this report. Construction Construction and repair activities began in late April 2010. Construction was completed in a span of approximately 2 weeks and the site was planted in early May. 3.1 Vegetation The repaired site was planted with approximately 3,000 wetland plugs. Plants were set at a 2ft center spacing to maximize coverage in the first year. All disturbed areas outside the wetland interior were seeded with grass and covered with straw mulch. Wetland Plant Species List Shallow Water Areas Shallow Land Areas Pontedaria Cordata Juncus effuses Petlandria vir inica Scir us validus S ar anium americanum Carex critina Saurus cernus Panicum vir alum Sa ittaria lati olia A total of 100 wetland shrubs were planted on slopes and areas above the normal pool level. Wetland shrubs Hibiscus moscheutos Rosa alustris Lobelia cardinalis Vernonia noveboracensis 4.0 YEAR 2010 RESULTS AND DISCUSSION 3.1.1 Results and Discussion Stormwater Wetland The CVM wetlands were visited many times over the summer and several times in the fall of 2010. Vegetation. Extended periods of no rainfall occurred twice over the summer of 2010. During these periods, water level in the wetland became dangerously low for plant survival. A temporary sprinkler system was set up to irrigate the plants and spread water from the deep pools. Irrigation efforts appear to have kept mortality to a minimum. However, dry conditions led to the volunteer growth of several grass and the spread of polygonum (smartweed). Polygonum is a common volunteer in shallow wetlands and can spread aggressively. In addition, to extended dry periods, several large rainstorms (> I") created flooded conditions that submerged young plants. The outlet structure was actively managed during these times to prevent extended submergence. By the end of the first growing season, the wetland is very well vegetated. The wetland interior has nearly reached 100% coverage. The dominant plant species in the wetland interior are Pondetaria cordata (pickerelweed), petlandria virginica (arrowhead), and polygonum. The wetland sideslopes have shown the survival of most species, however growth and coverage are less prolific. Wetland shrubs appear to have survived and are healthy. It is recommended that wetland vegetation continued to be monitored over the next growing season. Some additional planting around the wetland borders may improve the growth and coverage of shallow land species. Polygonum should be monitored to ensure it does not outcompete more desirable vegetation. Hydrology. The alternating droughty and flooded conditions of this summer made maintaining the design water levels a challenge. It appears that the wetland system is functioning properly and water levels are now being maintained at the proper level. Maintenance of the wetland inlet structures and regular cleanout of debris is critical to continued function. Both cells appear to be maintaining water levels appropriate for wetland vegetation. It is expected that site hydrologic conditions have stabilized, and that conditions will improve as construction activity nears completion. However, the wetland water level should be carefully managed in the spring of 2011 to ensure proper conditions during the beginning of the growing season. 6 NCSU College of Veterinary Medicine Wetland Repair Photo Log 2010 H. Sediment excavation N -'-x P-). SUHacc with topsoil added P3. Loading trucks for hauling N. Forebay and inlet structures cleanout P6. Interior deep pools added 4w. .?- F+LM?ff i? yyw ? .??.- rr rt - i ,rtr '_y . P 1 't. Irrigation/sprinkter setup 1112. Initial growth P7. Inlet apron repair P8. Planting wetland interior P9. Planting around deep pools P10. Wetland shrubs } far t ? w'?c'?1HiS?ty?71#7 + %a'F?$Pr . 4 L A' ? dl,' ?MI? yu l1? ? F??) )"°i??t X14 ?',; dt1M 4j A°.J???Jrjy? ?•.1 ? P13. OUL1y1" ?, ?r c?? ?? G 3 P14. Bulnish, arrowhead, dragonfly. P15. Hibiscus P16. First rainfall completely filled the wetland. P17. Upper Wetland - August 2010 ? r ,; ,???3`Be.,. ? i w? •, r.. , .xKi n '1 ? 14,.5 ?. ,. 3 a, . Y P 18. Upper Wetland - August 2010 P 18. Lower Wetland - August 2010 Appendix B. Wetland Repair Plans ","-COWS YNnoHYa KWON 'HOIN'IYN . 4M XOG n8 NI 3 § 'o i N s ? e 6uuaaup6ug a , 3 }t;oalag PUB119JL lallOALIIJOIS NiA3 pv.mirnau•6d puv pnn6o7oyg m ?' nsOx e o SNOIZI lmoo DNii'sIxa i C N O O N o -R o a o ° to ? o 0 d o o Q O N N o N C Q O ? ?? n oc O)p > O- O T V C l x a C O Q Ew c 0 0 CD ': a N o E E E ?a•X•X ? C,_ o o E p aao n.F- QQM 0 co W i lj? . ? Z 4 U T v C -4 C O) E d o+ 0 c Q0 O Li q j O wa ya_ w ya o L N _ °Eorrn 0 cm° v ONUrn yo C CP N wNQ OR obN2 ? 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