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N c- Ilk At, rat v�- � r� wc<►Y• r1�4SC/'�77�,C19�r t ,� hn v J I�l�;kt V►) c. s FI�IJ E's I _ c_v-` t , fim w— �1►� �o�.l �C .�s t(movaj M _W/—C- Expanded Harris Reservoir Wetlands Mitigation Planning ENVIRONMENTAL SERVICES, INC. r— Outline for Discussion • Evaluation of existing wetlands • Wetlands distribution modeling • Reference reservoir system • Develop wetlands mitigation concept plan Evaluation of existing wetlands • NCWAM classification of wetlands covered by approved JD • Functional evaluation on representative wetlands • Quantified HAR impacts per NCWAM (2012 1 Representative He Reservoir Wetland Types 9oaomWW Hardwood Forest In Utley Creek wrtemW • 2w older or greater streams, •1• InterMltendyto seasonally J Inundated 1 • NCWAM gating- Medium • Extended bwndadon affects Nnctlonel ra"M BlH • Nutrient removal • Export organic material • Surface and wDsurfacewater SUMP 10/31/2012 2 Representable Harris Reservoir Wedand Types Headwater Forest • less than 2"• order streams or topographic aenulatlons, seasonally to semF permanently saturated and a only Intennittemly inundated NCWAM Retina -High • Typically higher in landscape position • Intercept runoff • Filter pollutants before reaching streams 1WY Y' Representative Harris �t Reservoir Wedand Types RhroriM Swamp Forest In Norris aranoh watershed • Associated with airy stream order, feasoMliyto semi- permanentlyinundsted • NCWAM Raang -High • Flooderaterstorege • Groundwaterredurge • Nutrient removal • Organic material export • Wildlife habitat Representable Harris Reservoir Wetiend Types Nor W dal Freshwater Marsh • At kart semi-permanently inundated or saturated Includes kcustrineand riparian hhrge NCWAM Rsting -High • Hydriila and primrose slightly reducas habitat wtMmctlon rating, but not enough to affect Overall rating • Shoreline ftabRitallon Nutrient uptake Fish nursery • Wateriowl and wading bird habitat k� t 10/31/2012 3 Representative Harris Reservoir Wetland Types Non-Wal freshwater Momh • NCWAMRa Igh Harris Lacustrine Wetland Community Characterization • Soils • Species composition • Zonation patterns • Hydrologic influence Harris Lacustrine Wetland Community Characterization Soils • Primarily Triassic Basin parent materials • 2/3 of the soils in wetland areas evaluated have failed to develop hydric indicators 10/31/2012 4 Wetlands Affected by HAIR Project per NCWAM type 47593 052 081 75.29 361 - 3019 10.78 060 012 316 - - 9.76 099 - 60&67 972 093 Wetlands Distribution Modeling • Purpose: predict wetland formation around future reservoir (24(' MSL) based on current conditions (220' MSL) • Approach: linked wetland JO for current lake level to environmental features in a GIS as basis for predicting suitable wetlands habitat at future lake level • Assumption: similar hydrologic conditions at future normal pool r r LA. wresr.�.�r..r IIO��+rr.r.s.ro�w 10/31/2012 5 Wetlands Distribution Modeling - Methodology • Built three separate models— emergent, fringe, and terrestrial • Used CH21VIHi1I elevation zones to constrain potential habitat • Derived potential predictor variables from DEM and soils • Predictors represent terrain shape, landscape position, and soils characteristics • Used logistic regression since JD data is presence/absence • Correlated variables eliminated before models were built Wetlands Distribution Modeling - Results • Overall predictions were about 77% accurate • Emergent = 76 %, Fringe = 65 %, Terrestrial = 91% • For emergent and fringe models, relative elevation and horizontal distance from normal pool were most influential predictors • For terrestrial model, slope, relative elevation, and hydnc soils were most Influential predictor variables 10/31/2012 0 Harris Observed and Future Modeled Lake Levels IfE _ irr m��YVUr�roaur�a�r•i:a rrr�rra�r! Sim t><� i011i[l1110110141m1! n HEM \ 0ii0WHINt IV rY \r / /r�rrbJi•fYZ.r��rir��a,�l ►`f111f Reference reservoir review • Initial screening • Hydrology evaluation • Selection for on -site evaluation IfE _ irr m��YVUr�roaur�a�r•i:a rrr�rra�r! rars�zaurisrwsr•�i�rssa t><� Reference reservoir review • Initial screening • Hydrology evaluation • Selection for on -site evaluation 10/31/2012 7 rars�zaurisrwsr•�i�rssa t><� i011i[l1110110141m1! n HEM \ 0ii0WHINt IV rY \r / /r�rrbJi•fYZ.r��rir��a,�l ►`f111f Comm( iW \O7FAUA 11i im E.milla, Up, p0I011 irr��,w:�rr�ra�ar►ar.�J�n� �,Jrr-- — 10/31/2012 7 Jordan preliminary wetlands screening ,or&n LWo ftwmenr n.. w.wna. N—IMW ft shy .Mash MCWMPAft-KO t Danb Wh7 —.da Wf ygeYbn �,lnashm wYa aNOa) lean tpda & —ft,hM Nast —M..b Kry Ma rw d mYYI Iloa6r hand w(YYI011 Ib IIOI�IIYIw %DYb(Le IrydMa) db—d 10/31/2012 10/31/2012 Jordan Lake Examples of Shoreline Scarping Jordan lacustrine wetland community characterization • Soils • Species composition • Zonation patterns • Hydrologic influence Jordan Lacustrine Wetland Community Characterization Soils • Primarily Triassic Basin parent materials • 1/3 of the soils in wetland areas evaluated have failed to develop hydric indicators lype�mYOm 0.OSSbJamslb laasar lRasllWmsmplorTtltlArLatabW 10/31/2012 10 0 Vegetation Summary • Non -tidal freshwater marsh and lacustrine fringe 18(17%) 18(32%) 38J37%) 16(29%) •. 48(46%) 22(39%) 104 56 ac.r� s Wetlands mitigation concept plan considerations • Existing and future wetlands function • Wetlands distribution modeling • Reference reservoir • Land use • Watershed approach 10/31/2012 11 Harris Stream and Wetland Mitigation Planning IRT Site Visits 2011 -2012 Date Site Stream System ID (See figure) March 17, 2011 White Oak Creek and Big Branch (White Oak Creek) 17 and 18 Utley Creek 22 April 14, 2011 Utley Creek 22 Future inundation area in White Oak Creek (conceptual wetlands discussion) NA (adj. to 16) June 16, 2011 Lower Buckhorn Creek 1 July 13, 2011 Thomas Creek 7 September 16, 2011 Utley Creek 22 October 20, 2011 White Oak Creek and Big Branch (White Oak Creek) 17 and 18 March 8, 2012 Beaver Creek 31 April 19, 2012 Norris Branch (upper section) and Cary Branch 25 May 17, 2012 Jim Branch 28 Norris Branch (limited part of lower section) 25 June 21, 2012 Norris Branch (lower section) 25 Upper Buckhorn Creek 29 August 29, 2012 Little White Oak Creek 14 Big Branch (Little White Oak Creek) 11 September 20, 2012 Lower Buckhorn Creek 1 \,