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HomeMy WebLinkAbout20120948 Ver 1_Closeout Report_20160523MORGAN CREEK FLOODPLAIN RESTORATION: EEP/DMS #258 UNC -CH Mason Farm Biological Reserve — Orange & Durham Co. SCO ID # 0050645601 -- Vendor Contract # 5714 -- 404-401 ID# (exempt) CLOSE-OUT REPORT: Wetland Restoration & Preservation Project Settinq & Classifications Meeting XY Coord: LAT = 35.8923, LON = -79.0164 County: Orange & Durham General Location: Chapel Hill, NC Basin: Cape Fear (Haw R) Physiographic Region: Piedmont Ecoregion: Central Piedmont USGS Hydro Unit: 03030002-060080 NCDWQ Sub -basin: 03-06-06 Wetland Classification Riparian Thermal Regime: Warm Trout Water: No Project Performers Dec 2011 Source Agency: EEP (DMS) Designer: Ward Consulting Eng Monitoring Firm: Catena Group (MYO-2), Mogensen Mitig (MY3-5) Berm Gap Construct: River Works Inc Planting, Weed Control: Charles Bruton Natural Systems Transfer Stewardship: Yes Stewards: UNC Chapel Hill Project Activities and Timeline Milestone Month -Year Project Instituted Oct 2005 Restoration Plan & Design July 2008 Easement Reallocation May 2009 Project Permitted NA (exempt) Construction Completed July 2010 Planting & Weed Treatment Dec 2010 MY -0 Baseline Survey Mar 2011 As -Built Monitoring Report Aug 2011 MY -1 Monitoring Report Dec 2011 MY -2 Monitoring Report Nov 2012 Crest gauges installed Fall 2013 MY -3 Monitoring Report Dec 2013 MY -4 Monitoring Report Oct 2014 Repair Berm Gap Erosion Jun 2015 MY -5 Monitoring Report Dec 2015 Closeout Submittal Mar 2016 Project Setting and Summary The Morgan Creek Floodplain Restoration Site (DMS # 258) is located along the lower reach of Morgan Creek just before it enters Jordan Lake, 2.5 miles southeast of downtown Chapel Hill, in the Cape Fear River watershed (USGS HUC # 03030002-060080). Geologically, the site is in the Durham -Sanford Triassic Basin, with elevations between 242 to 248 feet. Predominant soils on the 31.5 acre site are mapped as Chewacla and Wehadkee series. The University of North Carolina (UNC) used the site for agricultural and silvicultural research from the 1900s to 1980s. In the 1940s they channelized Morgan Creek and constructed a soil berm (artificial levee) along the southwest bank to reduce flooding frequency, and excavated ditches to further drain the floodplain and facilitate agricultural use. The stream channelization, berm, drainage ditches, and land -use activities have degraded the former bottomland wetlands on the site. In 1984 the property was designated as the Mason Farm Biological Reserve (MFBR), and agricultural and silvicultural disturbances were ended. The property is now managed by UNC Botanical Garden, with the long-term goal of restoring more -or -less natural communities where feasible (http://ncbg.unc.edu/mason-farm-biological-reserve/). The Morgan Creek Floodplain Restoration project is designed to restore natural floodplain hydrology by constructing five rock -stabilized openings through the berm to increase natural floodwater access from Morgan Creek. Each opening (gap) is 15 feet wide at the base (at the existing floodplain elevation) and roughly 50 feet wide at the top of the berm. Native trees and shrubs were planted on poorly vegetated or exotic -dominated areas on the floodplain (previously farmed land) to restore a natural Piedmont Bottomland Forest community. The 31.5 acre project area includes 14.37 acres of wetland restoration and 5.61 acres of wetland preservation. The remaining 11.5 acres includes the berm, trails, and non -wetland areas. No stream work is included, but 3200 linear feet of riparian buffer along the south (right) bank of Morgan Creek is preserved. The project generates a total of 15.49 wetland mitigation units. No credit is sought for the buffer preservation. Project Goals and Objectives The goals of the restoration plan focus on improving water quality and ecological functions for Morgan Creek and the Jordan Lake watershed through the following: ° Increased overbank flooding to promote wetland habitats. ° Attenuation of floodwater sediments and nutrients within the floodplain. ° Retention of floodwaters thereby reducing downstream flooding. ° Reduced stormwater flow bank shear stress on Morgan Creek thereby improving localized bank and channel stabilization. The goals will be obtained through the following project -specific objectives, with the primary means to reaching these objectives being to breach the man-made berm along Morgan Creek: ° Increase the frequency of floodplain flooding to approximately 2.5 times/year ° Restore wetland hydrology to 17.5 acres of impacted wetlands ° Preserve an existing 8 -acre wetland ° Re-establish native wetland and riparian plant communities ° Treat and remove non-native invasive plant species ° Preserve 3200 linear feet of riparian buffer on the south bank of Morgan Creek Table 1. Success Criteria Success Criteria Measured Parameter Criteria Met Flood Hydrology: Morgan Creek Monitor 5 manual crest gauges Yes — Gauges and wrack lines should flood onto its historic (installed at each berm gap in indicate at least 2 floods in floodplain through the berm 2013) and the existing USGS 2013 and 3 or more floods per openings at least 2.5 times per year stream gauge on Morgan Cr year in 2011, 2012, 2014, and on average. 1,600 ft upstream. 2015. 5 -year average = 3.4 floods/yr. Wetland Hydrology, Soil Unit #1 RDS Ecotone groundwater gauges 1, 2, 4, 5, 6 installed in Yes in Part -- 4 of 5 gauges succeeded in 3 or more of 5 eastern portion of project: 12.5% of growing season = 27 days. soil unit #1; daily recording. years. Gauge #2 succeeded in 2 of 5 years (Table 3). Wetland Hydrology: Soil Unit #2 RDS Ecotone groundwater gauges 3, 9, A, B, C installed Yes in Part -- 4 of 5 gauges succeeded every year (5 years western portion of project: 5.0% of growing season =11 days. in soil unit #2; daily recording. for gauge #9, 1 year for gauges A, B, Q. Gauge #3 succeeded in 1 of 5 years (Table 3). Vegetation Community: Planted Monitor 5 CVS plots, 100 m2 Yes — 4 of 5 CVS plots areas should achieve at least 260 each, for survival and growth exceeded the criteria (with native woody trees/shrubs per acre of planted and volunteer stems. volunteers) and no low-density (planted + volunteers) in MY5. areas exceeding 0.10 acre were found. Table 2. Final Mitigation Assets Final Assets Table: Morgan Creek Floodplain # 258 — Closeout Mar 2016 Project Component or Reach ID Pre — Mitigation (acre / lin.ft) Mitigation Approach Total Wetland As -Built (acre / lin.ft) Mitigation Ratio Mitigation Credits (wnnu) Wetland Units Wetland Units (WMU) Buffer Offset 0 15.49 Riparian Wetland 14.37 ac R 0 14.37 ac 1:1 14.37 Riparian Wetland 5.61 ac P 5.61 ac 5:1 1.12 Total 19.98 ac R + P 19.98 ac 15.49 wmu Assets Summary: Mitigation Unit Totals Stream Mitigation Units Riparian Non -riparian Total Wetland Riparian Nutrient (SMU) Wetland Units Wetland Units (WMU) Buffer Offset 0 15.49 0 15.49 0 0 To USGS Gauge UNC Finlay GolICourse NAD' *.., a O k/4}'"e �w t 'til liy l.Ity snhl 2 G�nservatlan €asernent (1-59 a�a1 Ox RDS Groundwater Gauge CV5 Vegetation Plant Rx Reran €5paning+Crest Gauge Planting gone 1: Trees + Shrubs (12.51 ac) Planting Zone 2: Understory Shrubs (5.$5 ae) To Big Oak W €rod s hydric sail 1 Sail Unit 1 Wetland Restoratlon: (9.05 ac) hydric soil Soil Unit 2 Weiland Restnratlon: (5.31 ac) Wetland Preservatim: (5-51 ac) hydricsoil':``'- ro 49 hydrdcsoil i wetland i i preseraRtivn '•� + i %\ To a _ Jordan 500 Feet `~ --. e6+ take Figure la. Morgan Creek Floodplain Restoration Site (DMS # 258): Final Project Assets Map. Figure lb. Morgan Creek Floodplain Restoration Site (DMS # 258): Wetland Restoration and Preservation Areas on Aerial Basemap. Or�sng¢ Y r t xu Grove 711 F,;, -1 n i, Ek IT, ��crfi _ ns ii Eutja'ning f° ' P-R®� ro�sa�Aa W. r^ L' Eu64 " k e' - w,- r; 501 } LJ f AFl45REW5 I .'� rl 4 I EkV¢ 'V rte,Morgan Creek Watershed [y w `,F WATK F� ��' '�a +kir. '�,. •� x � { � _ _ r cI ,, _'% r a Q v 2 fL C �1LEY --: tai GH,6P II. 11 4 t alvander t' 111`'� 17 f �' Y i 'firs` ' c, c• - ,t A113D rt EPN KA r ICTUS ou 903 i I �f t qb �`v cue �o i i �4}FIE � t F 5 -Morgan Gr ���T j r S.t ells ' �� (f !� � �'�■��gO♦pOd�lin 's �¢ r mitigati�_ n P4 � ILS r , Jg ��441 r .it d�tti r 1 c a 1 ,�. . f�, S�ItE~ 25$ - rRA.Dugwi Atrnnd _ —NL 1 moi.Y� F +'� 4f'` Cc —.femn 0) �. {4}� , +�' �- Jordan La v I 0 7, I 4 + , J �MKi�� _ vn�a,.,.. nn r f s: � ` i % Figure 2a. Morgan Creek Floodplain Restoration Site (DMS # 258): Project Vicinity and Watershed Map, Orange, Durham, and Chatham Counties, NC. (DeLorme Atlas & Gazeteer) rL w1iI IY'L r" s• ;' 0 sir:: �JI • t ' r`` ILL f�y....5 .r`-, it y �f -I �' t /�%/91* —f�.. - ,- .�1,+ a I i �, .� ;" '� i Iw' it 1�i� •++ � � 'T T i . . �'•� # Finley �+ ��,� � 1�` _ r ._ '-�� ti �. xr �` .+ " , 1 Golf t ,• Course Al *��'_ -r1 'l`. -�.. ` tit t x.�f _ J �y_4 ,., i ..."�L' �_ r� *}� -`� ■ �' i�,�. '`- � � fir.•-��,�`i; � r`' �`� �°' ..� l � - �'-� �,, �, `' � ,,r � �= � �rf�"'---r� _ ■ R a y.r'r! �# / .-a.` �-.=--' _ � '^ � _ � `.�% r$t � !. • ! "1� ` t t l/,rs,fi' '} R _.°= R .r1 C�„ f I' I•' �',. Usgs -411 �t ` r � q y, r � � �� ._ it ICY ,,�,,., . �r • ' a �,%� s .ir 1Ir� �3� �� ��t� �—�" � � �� •�" `. f r mea fr- • � .r tr � `. �-.fir-�-� ��j _ "# t � �..t - f F,��i _ � I -R 'fir • - � i t 0 'ill., `=\ i • * y ..✓ 9 - °'� h ./" ,� ++���� �1 °R`. I � r I _ • 1 G V�7' � � �r�/'-� � �`�r'r� I � y �� � >��tir� +f ,�+'. � C3 � f �`-,. { � � _ ; �' � -.,.- �' +'� !"`_^--•�-�'�.�.3, � yam- _}`-ti', i'F� • ..�' .. -.��. r ,�� � � -" �.- .. 1 ms`s` fR127$mpll f �r�'� U�,'t � 4`• �`�\ f � �;'`- `- {���� *•4£�� ���`�' � �'`�' 1J{ � QiD�t3�ll"�� �,� � f �� /r Reserve F+' 09 -ter ' j , r�/f � '• 1.1 � � � � _ Y. IV 0 Avet, )001 �' - •�'•` .fes �� � ,� � �} � k. �—���� �`� , , ,� � � +�'���,1�1 � •� .r� t. 1. +� y` l - _*-��'-{ r 9 7 r f f+ ; �J.,LL r� � � 7 { )') � ,` P �� �'r. � ♦ �f �.. , ��1 i r � �>." 7 � i d Figure 2b. Morgan Creek Floodplain Restoration Site (DMS # 258): USGS Topographic Quadrangle, Chapel Hill, NC. USDA Online Sail Survey Data Ch = Chewacla loans w! Wehadkee inclusions _Cp = Congaree fine sandy loam C rB = Creed moor fine sandy loam 2-8% WsB = White Stare loam 2-6% WtC2 = White Store clay loam 6-15% Figure 3. Morgan Creek Floodplain Restoration Site (DMS # 258): Top Map = USDA Soil Survey (1977); Bottom Map = On-site Hydric Soil Delineation (2008), Orange & Durham Counties, NC. Figure 4. Morgan Creek Floodplain Restoration Site (DMS # 258): Project Remediation Areas — High flows eroded the berm gaps in 2013-2014, displacing soil and rock from the wire gabions. These areas were repaired during the spring -summer of 2015. Gauges 1,2,4,5,6 are in Restoration Unit 1; success criterion= 12.5% of growing season (27 consecutive days) Gauges 3,9,A,B,C are in Resoration Soil Unit 2; success criteria =5%of growing season (11 consecutive days) Growing Season (Chapel Hill, NC)=March 28 to November 3 = 227 days. Table 3. Morgan Creek Floodplain Restoration Site (DMS # 258): Wetland hydrology criteria attainment, 2010 to 2015, from RDS Ecotone groundwater gauges. 2011 2012 2013 2014 2015 2011-2015 Gage# 1 Max#Consec 61 Days%Grow Sea... 28 success cdteria Yes Met Max#Consec Days %Grow Season 35 16 success Criteria Yes Met Max#Consec Days %Grow Season 50 22 successcriteea Yes Met Max#Consec Days %Grow Season 46 21 snaesscraeda Met Yes Max#Consec Days %Grow Season successcdteda 42 19 Mee Yes Yearsof Success 5 of5 2 34 15 Yes 8 4 No 23 10 No 39 18 Yes 27 13 Yes 3of5 3 5 2 No 3 1 No - - - 7 3 No 14 6 Yes 1of4 4 8 4 No 23 10 No 48 21 Yes 39 18 Yes 25 11 No 2of5 5 53 24 Yes 61 28 Yes 52 23 Yes 46 21 Yes 42 19 Yes 50f5 6 51 23 Yes 25 25 No 51 23 Yes 46 21 Yes 46 21 Yes 4of5 9 32 14 Yes 11 11 Yes 32 15 Yes 45 20 Yes 41 19 Yes 5 of5 10 61 18 Yes 42 42 Yes 169 76 Yes - - - - - - 3 of3 A - - - - - - - - - - - - 20 9 Yes 1 of 1 B - - - - - 40 18 Yes 1 of 1 C - - - - - - - - - - - - 40 18 Yes 1 of 1 Gauges 1,2,4,5,6 are in Restoration Unit 1; success criterion= 12.5% of growing season (27 consecutive days) Gauges 3,9,A,B,C are in Resoration Soil Unit 2; success criteria =5%of growing season (11 consecutive days) Growing Season (Chapel Hill, NC)=March 28 to November 3 = 227 days. Table 3. Morgan Creek Floodplain Restoration Site (DMS # 258): Wetland hydrology criteria attainment, 2010 to 2015, from RDS Ecotone groundwater gauges. 9 s 7 m Percentile Graph for Rainfall 2010-2015 2 1 0 aaiitiary Fel)rtiary Harch April Id ay hire ltlly htipst September Octol)er November December Date Rahifall2010 Rainfall 2011 Rainfall 2012 MRahifall20B MRain#all 2014 MRainfall 2015 — 30tli Percentile —70th Percentile Figure 5. Morgan Creek Floodplain Restoration Site (DMS # 258): Plot of monthly rainfall totals by year from 2010 to 2015, with 3011 and 70' percentile climate normal values. Monthly rainfall totals recorded at Third Fork Creek, USGS Gauge# 355511078570745 (4 miles ENE of project site). Monthly climate normal values are based on the 30 year period from 1981 to 2010 at Williams Airport, Chapel Hill. Table 4. Over -bank Flood Events Through Berm Openings Morgan Creek Floodplain -DMS # 258 Date of Data Collection Date of Occurrence Data Method / Evidence Photo # 17 -Dec -10 Fall 2010 Observed wrack lines south of berm gaps MY -01 #6 3 -Jun -11 27 -May -11 USGS Gauge height > 11.0 feet, wrack observed MY -01 #7 1 -Aug -11 31 -Jul -11 USGS Gauge height > 9.0 feet, wrack observed MY -01 #8 7 -Sep -11 7 -Sep -11 USGS Gauge height > 8.5 feet n/a 23 -May -12 23 -May -12 USGS Gauge height > 8.0 feet n/a 28 -Jul -12 28 -Jul -12 USGS Gauge height > 9.7 feet n/a 3 -Sep -12 3 -Sep -12 USGS Gauge height > 9.3 feet n/a 19 -Sep -12 19 -Sep -12 USGS Gauge height > 10.1 feet, wrack observed MY -02 #6 30 -Jun -13 30 -Jun -13 USGS Gauge height > 8.5 feet n/a 1 -Jul -13 1 -Jul -13 USGS Gauge height > 8.5 feet n/a 7 -Mar -14 7 -Mar -14 USGS Gauge height > 8.5 feet n/a 16 -May -14 16 -May -14 USGS Gauge height > 8.5 feet n/a 2 -Sep -14 Jun -Aug -14 *Berm Gap 1 - Crest Gauge Flood Elevation 2 feet n/a 2 -Sep -14 Jun -Aug -14 *Berm Gap 2 - Crest Gauge Flood Elevation 3 feet n/a 2 -Sep -14 Jun -Aug -14 *Berm Gap 3 - Crest gauge damaged n/a 2 -Sep -14 Jun -Aug -14 *Berm Gap 4 - Crest Gauge Flood Elevation 2.3 feet n/a 2 -Sep -14 Jun -Aug -14 *Berm Gap 5 - Crest Gauge Flood Elevation 3 feet n/a 5 -Mar -15 5 -Mar -15 USGS Gauge height > 8.0 feet n/a 19 -Apr -15 19 -Apr -15 USGS Gauge height > 9.5 feet n/a 2 -Oct -15 2 -Oct -15 USGS Gauge height > 10.2 feet n/a 9 -Nov -15 9 -Nov -15 USGS Gauge height > 7.9 feet n/a 19 -Nov -15 19 -Nov -15 USGS Gauge height > 8.0 feet n/a 16 -Dec -15 2 -Oct -15 *Berm Gap 1 - Crest Gauge Flood Elevation 0.7 feet n/a 16 -Dec -15 2 -Oct -15 *Berm Gap 2 - Crest Gauge Flood Elevation 1.5 feet n/a 16 -Dec -15 2 -Oct -15 *Berm Gap 3 - Crest Gauge Flood Elevation 1.2 feet n/a 16 -Dec -15 I 2 -Oct -15 *Berm Gap 4 - Crest Gauge Flood Elevation 2.7 feet n/a 16 -Dec -15 2 -Oct -15 *Berm Gap 5 - Crest Gauge Flood Elevation 1.9 feet n/a * Crest gauges reset after cork measurement Plantinq Zone 1 –(Piedmont Bottom land Hardwood (turves 1251 acnes Pla nti ng Density = approx. 400 stems�acre for (approximately 10' X 10' spaacin ) QLJ-,Irltity ITaxonemic Name lCommon Mame TT—Y P e Canopy Layer lCommon Narne I Tyrpe 200 ,betula nigra River birch bare root 3001 Pfatanus occidentalis Sycamore bare root 3001 Linodendron tulipifera Tulip poplar bare root 2001 NVyssa syfvatica blackgurn bare root 2001 Diospyros Orgruana Arnencan Persimmon bare root 3001 Carya ccrC#fcrrrus bitternut hickory bare root 30C. Quercusphallas Willow oak bare root 210 Ufmus rubra Slippery elm bare root 20CD Quercus michauxii Swamp chestnut soak bare root Small Tree and Shrub Layer ITotal Sterns 200 Alnus serruiata Tag alder bare root 300 Carp nus caratiniana Ironwood bare root 2401 Cornus arnornum Silky dogwood bare root 230 Sambucus eanadensis EIderberry bare root 1401 Rhododendron v scosum Swamp azalea bare root 2101 5taphyl+ea trffolia Bladdemut bare root 234: 'Vaccfnium corymbosurnr Highbush blueberry bare root 3764 Total Stems Planting Zone - (Piedmont Bottorriand Hardwood Forest -Enhancement) 5.85 ac Planting Density = approx. 400 sternsiacre Planting Density = approx. 600 ste,m acre Quantity Taxonomic Name lCommon Narne I Tyrpe Shrub Layer 100 Alnus serrulata Tag alder bare root 200 Arorxa arbutifolia Red chokeberry bare root 260 Carrxis arnornum Silky dogwood bare roast 300 Sarnbucus canaderrsis Elderberry bare root 300 Lindera benzoin Spicebush bare root 300 VibLr u.rrn nudum P'ossumhaw uibumum bare root 325 Am4anctrierarborea SeNcebeny bare root 400 vacciryium corymbosti a Highbush blueberry bare root 2340 ITotal Sterns Planting Zane 3 - (Berm Openings) 1.15 ac Planting Density = approx. 600 ste,m acre Ouantity ITaxonromic Name lCornmon Name I Tyree Shrubs 50 Ainus serrufata Tag alder bare root 100. Cornus amomurn Silky dogwood bare root 100 Sambucus canadan&s Elderberry bare root 00 Jtea kdrginica V it inia wi Ilow bare root 75 Aroma arbutifo is fled choke -bar bare root 801 Viburnum pudum Pessumhaw viburnum bare root 100 Euonymous americana Strawberry bush bare root 001 Vaccinum ccrymbosum Highbush blueberry bare root 685 Total Stems Morgan Creek Floodplain Restoration Site (DMS # 258): Woody species planted in Dec 2010. Native grasses and herbs were seeded in non -forested areas, including Elymus, Panicum, Dicanthelium, Andropogon, Schizachyrium, Sorgastrum, Tripsicum, Juncus, Bidens, Coreopsis, and Vernonia. Total and Planted Stems by Plot and Year PnoLS = Planted excluding livestakes T = All planted and natural recruits including livestakes Recommendation & Conclusion The project has met its success criteria and is functioning well. The berm openings have increased the flooding frequent from Morgan Creek onto its historic floodplain; two to five floods per year were documented during 2011 to 2015. Wetland hydrology has increased in areas where the flood -control berm and ditches had effectively dewatered these wetlands since the 1940s. Five of the original seven groundwater gauges met the success criteria during three or more of the 5 -year monitoring period, and three additional gauges installed in mid -2014 all met success criteria in 2015. Alluvial forest trees and shrubs, both planted and volunteer, are reclaiming the site. Average stem density of native woody species among the five CVS plots far exceeded the success criterion in 2015, with volunteers included. All remaining planted areas outside the CVS plots have adequate native woody density, and no low-density areas exceeding 0.10 acre were noted. Exotic species are common, due to past use of the site, but are not a significant threat to reestablishment of a bottomland forest community. The NC Division of Mitigation Services (DMS, formerly NCEEP) recommends closing out this project with the mitigation units specified in Table 2, specifically: 15.49 riparian wetland mitigation units. Contingencies: (None) Photos Attached: Pre -Construction and MY5 Baseline Year 1 Year 2 Year 3 Year 4 Year 5 PnoLS T PnoLS T PnoLS T PnoLS T PnoLS T PnoLS T Plot 1 566.6 566.6 404.7 404.7 405 688 283 324 243 283 243 243 Plot 2 404.7 404.7 242.8 242.8 202 1902 202 1012 162 971 202 890 Plot 3 607 607 364.2 364.2 283 1295 283 1093 283 931 1 283 931 Plot 4 607 607 445.2 445.2 283 1862 243 931 283 1295 202 1133 Plot 5 1 485.6 485.6 323.7 1 323.7 1 243 1 890 1 0 0 0 405 0 647 Yearly Average 534.2 534.2 1 356.1 1 356.1 1 283 1327 1 194 1 1206 1 194 777 186 769 PnoLS = Planted excluding livestakes T = All planted and natural recruits including livestakes Recommendation & Conclusion The project has met its success criteria and is functioning well. The berm openings have increased the flooding frequent from Morgan Creek onto its historic floodplain; two to five floods per year were documented during 2011 to 2015. Wetland hydrology has increased in areas where the flood -control berm and ditches had effectively dewatered these wetlands since the 1940s. Five of the original seven groundwater gauges met the success criteria during three or more of the 5 -year monitoring period, and three additional gauges installed in mid -2014 all met success criteria in 2015. Alluvial forest trees and shrubs, both planted and volunteer, are reclaiming the site. Average stem density of native woody species among the five CVS plots far exceeded the success criterion in 2015, with volunteers included. All remaining planted areas outside the CVS plots have adequate native woody density, and no low-density areas exceeding 0.10 acre were noted. Exotic species are common, due to past use of the site, but are not a significant threat to reestablishment of a bottomland forest community. The NC Division of Mitigation Services (DMS, formerly NCEEP) recommends closing out this project with the mitigation units specified in Table 2, specifically: 15.49 riparian wetland mitigation units. Contingencies: (None) Photos Attached: Pre -Construction and MY5 Pre- and Post -Restoration Photos - Morgan Creek Floodplain #258 - Closeout Report Morgan Cr Floodplain #258 - Closeout Report 17 Mogensen Mitigation Inc - Draft Mar 2016 ;t 1 1 }y.I - - h�- hj f ilk'. 1 Topics Ron AM '�J14 r -y c w 34 Pq Avea- i Pre- and Post -Restoration Photos - Morgan Creek Floodplain #258 - Closeout Report Berm Opening (typical, after flood) Apr 2011 Berm Opening (#1 ) Dec 2015 Morgan Cr Floodplain #258 - Closeout Report 19 Mogensen Mitigation Inc - Draft Mar 2016 Pre- and Post -Restoration Photos - Morgan Creek Floodplain #258 - Closeout Report Recent Flood through Berm Opening 5: Apr 2015 Restored Wetland, GW wells B and 9: Apr 2015 Morgan Cr Floodplain #258 - Closeout Report 20 Mogensen Mitigation Inc - Draft Mar 2016 Appendix A Watershed Planning Summary Morgan Creek Floodplain Watershed Characteristic Overview The Morgan Creek Floodplain wetland restoration and preservation project is located in the Morgan and Little Creeks Local Watershed Plan, within the Cape Fear River Basin in Orange County. According to the 2009 Cape Fear River Basin Restoration Priorities Plan the Morgan Creek watershed (HU 03030002060080) is characterized by 7% agricultural land use, 59% forested, 23% prioritized by the NCNHP as Natural Heritage Natural Area and 8% impervious. In addition, the majority of the watershed is identified as a Water Supply Watershed while 18% of the streams included on the NCDWR 303d List. There is one additional DMS project in this watershed, Chapel Creek, which closed out in 2014. Morgan Creek, which is also located within the Upper New Hope watershed and drains to Jordan Lake, is identified by the NCDWR as Nutrient Sensitive Water Supply Water and is identified on the 2012 303d List. According to the 2009 RBRP, improving water quality flowing to Jordan Lake is the highest priority in the Cape Fear 03030002 Catalog Unit. This project is located within a reserve call the Mason Farm Biological Reserve (MFBR) which is now managed by UNC Botanical Garden. Within the MFBR, the Morgan Creek Floodplain project is adjacent to the most ancient forested site called Big Oak Woods. Big Oak Woods is a 65 -acre hardwood bottomland and has been continuously forested since before European settlement that has never been clear-cut or plowed. Some of the larger white oaks exceed 300 years of age. The MFBR protects natural areas, supports academic research and public education. The MFBR plus contiguous undeveloped tracts create an approximately 900 -acre natural area that connects with the 41,000 -acre New Hope Game Lands to the south. (http://ncbg.unc.edu/mason-farm-biological-reserve/) In addition, the NCNHP designated this area as a Natural Heritage Natural Area (NHNA) and rated it as Exceptional, which is the highest rating. This project is also located along two other NHNAs, within the Morgan Creek Floodplain Forest (which is rated as Very High), within the Morgan Creek Bluffs (rated Very High). The development of the Morgan and Little Creeks LWP included intensive field monitoring and GIS assessment which pinpointed major causes of degradation for watershed streams. Stressors identified in the LWP affecting watershed functions include: phosphorus load, nitrogen load, poor in -stream habitat, low dissolved oxygen, pathogen load, poor/loss of wildlife habitat, flooding potential and wetland loss. Links to Watershed Goals and Objectives The table below summarizes the major LWP-identified stressors in the Morgan and Little Creeks LWP area, recommended management strategies, and stressor -related objectives achieved by the Morgan Creek Floodplain project. Stressors and Issues Management Strategies Morgan Creek Floodplain Riparian Buffer Disturbance Stormwater management, stream Native trees and shrubs planted on poorly restoration, protect open space, buffer vegetated or exotic -dominated areas on restoration the floodplain (previously farmed land) to restore a natural Piedmont Bottomland Forest community. Floodplain Alteration Stream, buffer and wetland restoration, Restored natural floodplain hydrology by stormwater management, protect open constructing five rock -stabilized openings space, prevent floodplain encroachment through existing berm to increase natural floodwater access from Morgan Creek. Jordan Lake Eutrophication Nonpoint source management such as Restored floodplain connection through buffer restoration, buffer protection, natural floodwater access from Morgan stormwater management, stream Creek. Native trees and shrubs planted on restoration, additional monitoring poorly vegetated or exotic -dominated areas on the floodplain (previously farmed land) to restore a natural Piedmont Bottomland Forest community. Lack of Forest Habitat Buffer protection, education, stream Restored a natural Piedmont Bottomland Contiguousness restoration, buffer restoration Forest community within a high value natural resource that connects to additional important State of NC resources. Lack of High Quality Habitat Buffer protection, education, stream Planted native trees and shrubs on poorly restoration, stormwater management, vegetated or exotic -dominated areas in buffer restoration floodplain (previously farmed land) to restore a natural Piedmont Bottomland Forest community in an area designated by NCNHP as an Exceptional Natural Resource in the state. Watershed Context Summary In addition to the Morgan Creek Floodplain project there is one additional DMS project, Chapel Creek (Long Term Management), two CWMTF projects (a wastewater and an innovative stormwater site) and one Section 319 project (rain garden) within the LWP. 2016 DMS Project Closeout: Morgan Greek Floodplain Morgan and Utl e Creeks LWP Chapel Creek `r 2035 Closaeout Project r` DMS Projects q, CWMTF Projects 1W, 9 Projects NHP Natural Heritage N atural roet Local Watersheds al Watershed Plaris Morgan Creek Floodplain [pal Bounanes 0 0.0 1 2 ty Boundary _ _ Miles N Appendix B: Property Ownership & Protection The site protection instrument for this mitigation project includes the following document(s), available at the specified County Register of Deeds office, and is linked to the property portfolio at: http://ncdenr.s3.amazonaws.com/s3fs-public/Mitigation Services/Document Management Library/Property/Property Portfolio/258 MorganCreekFloodplain PD 2004.pdf Project Name IMS county Grantor Property Rights Area Morgan Creek Floodplain 258 Orange UNC -Chapel Hill Reallocation of Fights 31.5 Long-term stewardship of this property is managed by the NC DEQ Stewardship Program. Mitigation Project Morgan Creek Floodplain DMS IMS ID 258 River Basin CAPE FEAR Cataloging Unit 03030002 Applied Credit Ratios: 1:1 1.5:1 2.5:1 5:1 1:1 3:1 2:1 5:1 1:1 3:1 2:1 5:1 1:1 3:1 2:1 5:1 Information from DMS Debit Ledger dated 05/19/2016 2 E'+' C E c N E O E" C C .� m C C m o C C O m E C C m C C t0 O C R C o C C N E E C C ,p O N C m O ` C 10 O y C d m E N C O m m v d m a a u a - m � W D!' U D! L 0! ` O N O U O L O N W N U A L ry Cr o W c W a o W a z z z C W z a o U o U o C U W o y U Beginning Balance (feet and acres) 14.37 5.61 Beginning Balance (mitigation credits) 14.37 1.122 NCDOT Pre -DMS Debits (feet and acres): Not Applicable DMS Debits (feet and acres): DWR Permit No USACE Action IDs Impact Project Name NCDOT TIP U-47638 - Triangle Parkway, Durham and Wake 2008-0540 2006-20445-232 Counties 4.610 NCDOT TIP R-2635 - Western 2007-1470 2007-02903 Wake Expressway, Wake County I I 1 1.0001 1 NCDOT TIP R -2413C - NC 68 Connector, Guilford and 2011-0392 2002-20447 Rockingham Counties 1.590 NCDOT TIP R -2413A/13 - NC 68 Connector, Guilford and 2013-0517 2013-00557 Rockingham Counties 5.480 NCDOT TIP R-26128 - US 421 2013-0912 2013-01990 Improvements, Guilford County 4.780 Remaining Balance (feet and acres) 2.520 0.00 Remaining Balance (mitigation credits) 2.520 0.000 Information from DMS Debit Ledger dated 05/19/2016