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HomeMy WebLinkAbout20160299_Mitigation USACE Meeting minutes 080715_20150827 Carpenter,Kristi From:Wanucha, Dave Sent:Thursday, August 27, 2015 7:43 AM To:Baker, Virginia Subject:R-2536 Asheboro Bypass Attachments:Mitigation USACE Meeting minutes 080715.pdf Hi Ginny, See attached Draft minutes. The Corps asked that they rewrite number 7. This is the Asheboro Bypass project R-2536. Dave Dave Wanucha NC DENR Winston Salem Region Office NC Division of Water Resources Transportation Permitting Unit 450 W. Hanes Mill Rd, Suite 300 Winston-Salem, NC 27105 Cell (336) 403-5655 Office (336) 776-9703 Dave.Wanucha@ncdenr.gov ----- E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. 1 Viability of Onsite Mitigation Discussion ; w/USACE Meeting Minutes ' I Project: R-2536 (Asheboro Southern Bypass and Zoo Connector) Date: August 07, 2015 Location: NCDOT Century Center - Pamlico Conference Room Time: 10:30 to 12:30 pm Attendees: See attached Sign-in Sheet Minutes Authored by: Tina Swiezy, RK&K ■ . . � � +! Bypass Cpnstructors LLa�:` ` �- ..� . - The following is a brief summary of the major discussion items, conclusions, and action items resulting from the referenced meeting, Viability of Onsite Mitigation w/USACE representative Andy Williams for the R-2536 project. The purpose of the meeting was to discuss the potential stream and wetland credit far project mitigation sites based on current need in the watershed and construction methodologies presented. Also, steps forward were to be proposed to complete the vetting process on the sites previously deemed feasible in the study reviewed by NCDOT. DISCUSSION/CONCLUSIONS 1. Jim Eisenhardt provided a summary of the purpose of the meeting stated below: a. To confirm that EEP is providing the mitigation for the project and that is the preferred method of mitigation by the USACE. b. To determine if the USACE is receptive to utilizing an integrated stream and floodplain restoration approach to restore the stream and construct riparian wetlands in the floodplain to meet some or all of the wetland mitigation acreage needs in this watershed. 2. There was a discussion of need for Riparian Wetland Mitigation Credit in the Cape Fear HUC where the Feasibility Study for the project identified viable sites. 3. The team confirmed with Leilani Paugh that NCDOT is willing to pay mitigation fees to develop the identified sites based on successful monitoring results. 4. Drew Altland presented some bacic ground information to bring the agency and NCDOT representatives up to date on the integrated stream and floodplain restoration approach we purpose to utilize. A copy of the presentation is attached to these minutes. 5. Following the presentation a discussion regarding the field applicability of this method confirmed wide spread support amongst the meeting attendees to get a project in the ground using the methods proposed. 6. Andy Williams stated he needed to confer with other personnel within USACE in Wilmington to determine the possible credit format (riparian wetlands restoration versus creation) far a project of this nature. The presentation given by Drew Altland and Jim Eisenhardt strived to make the case that the integrated stream and floodplain restoration approach leads to restored riparian wetlands and not creation of wetlands, as the approach focuses on restoring lost functions that are typically impacted by a long history of anthropogenic influences. 7. The following items were concurred upon during the meeting: a. The agencies will approve the Section 404 and related permits based on use of the NCEEP commitments for the project. However, should NCDOT obtain access from property owners for the proposed on site mitigation projects discussed during the meeting and NCDOT desires to pursue impleinentation of these sites, the agencies would accept the mitigation for wetlands and streams, provided successfully implemented, and would prepare a permit condition modification once approved. If the on-site mitigation projects are secured and concepts can be developed prior to the approval of the permit, on site mitigation can be incorporated into the permit to suffice mitigation requirements in whole or part. TII� No. R-253G: US G4 Asheboro Southern Bypass and Zoo Connector �� a, �'� �� R�( �f[ Minutes I 2 b. The agencies concurred that should the mitigation proposed result in both riparian wetlands and stream restoration, NCDOT would receive both wetland credit and stream credit. c. NCDOT and agencies concurred that current guidance is wetlands restoration is 1:1 for mitigating impacts and wetlands creation is 2:1/3:1 depending on restoration proposed. d. Agencies agreed that although NCEEP has stream credits available in the watershed (however no wetlands credits), should NCDOT pursue the integrated restoration approach, NCDOT can use the on-site stream restoration to substitute for that portion of stream credits from NCEEP, provided NCDOT demonstrates the on-site mitigation provides uplift and would be viewed by the agencies as appropriate for the location. e. The agencies indicated that should the on-site mitigation sites be preferred by NCDOT after property owner coardination, the agencies would require the following for the sites to be accepted as approved f. g• mitigation for the permit: i. Narrative describing the benefits of the restoration and its appropriateness as mitigation in this watershed in lieu of the NCEEP mitigation sites. ii. Concept/preliminary design plans. The agencies indicated the plans/images provided during the meeting are close to the level of detail needed to submit for this purpose but do contain all the information required. NCDOT/RK&K will collect additional site constraint data and amend the plans accordingly prior to submission (including a delineation of jurisdictional features, soils information and groundwater elevations). Since the agencies agreed that the perinit would not be held up while the on-site mitigation was being assessed or implemented, NCDOT and the agencies agreed that pursuit of the on-site mitigation would be done on a separate track and schedule from the roadway improvements. NCDOT clari�ed during the meeting that the DB team would be paid $289/LF for stream mitigation and $3,9430 per 1/l Or" of an acre for wetland mitigation upon acceptance of the mitigation sites after the mandatory one year monitaring period. The $289/LF would apply for the stream channels that would result from the methodology proposed during the meeting. The $3,9430 per l/lOth of an acre for wetland mitigation would be paid for wetland restoration or wetland creation at each site. ACTION ITEMS Y RK&K to prepare meeting minutes. Y RK&K to determine R/W potential for the proposed on site mitigation parcels discussed during the meeting. Y USACE to determine the viability for the wetland restoration method for credit with the Wilmington personnel and report back to NCDOT. Y RK&K to prepare and submit concept plans to USACE/NCDNR for review and approval and acceptance as part of mitigation requirements for the pending permit. 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I ntervention A roaches pp � Basic Restoration Approaches �---------- ----- __ �.� -----------'----- � L�v�[� r; � A�r � .' i i . � , , . � �-:._ *4.LlJYIAL. aF.f3lkd Pv- � �- � �` l . �.. JAf ..v `}tL� �"au .}6'A]tRv_.. r '?i"� �"�'� - � _ A.'K�LlC � l3Lr ' , ��. 3�M't �1 Nrs� �� c .;��I � k' �.. l fi 'y� t : � � f , _ � � � • . ,� �,�. �'F � . ift`FiCCR � � k� A�,� ' ... ' „ � , � � y�r� Removal of modern 1 sediment to re-connect floodplain (Rosgen Priority 2) Incised channel 2 stabilization to store modern sediment (Rosgen Priority 3) Raise streambed to store modern sediment and tie 3 into modern terrace (Rosgen Priority 1) 14 � e. � � � � � � � � � � � � � � � � � � � � ` _ �a-��Q_._���� � � `"�'a... � ,��1V1.�.� ��Ef]�IhAtt+dTS ��� - � � ,� • � �(;*�i4V�L+"C[��3�#L£ `�—, � _� � _ ?� ..~ i.. . . . _ . . , .. '\' - t , . � .. ' � ''����z 'i/ � k3A,� i":J�..S�t � , — �� P} � fW[3hNJe � .'�{ i .. .. Key Features to Approach 1: i � � � � � � � � � � � ��I, � � � � � � ' ' � W. � I _]' �. } �� � ��r��;� ,: �'`��:�� �'�'.i/. . r. . r . .. � .. _ �.. .� �+~/ ■ Connects floodplain root zone to �roundwater ■ Promotes retention of carbon, sediment and nutrient ■ Relies on vegetation and native materials for stability ■ Frequent floodplain connection ■ Increases flood storage ■ Moves evolutionary trend forward �� Saucon Creek: - Drainage Area = 30.4 sq. mi. - Design Discharge = 108 cfs - Regional Curve Bkf. Discharge = 1133 cfs �,..� -,� -_ . �..bo � �`��+��� ��3e.t�-"�iY.�-wr 1� � r � '-..��� __ .r�$'�'. � �._._ ., _-. . � Y: . , �.��-. F-�' { �; :�.� � i�:_ . ..>.ti r ,�* �c, �_ �� � .. �. "n�P �T a..—� ��.J� *' ��J-'+�r� " -'1.�-s ��: I � � ��__ _�_�� _ - _ " •� � �� . . —.,,.. _e� " •_ . " �� - � � .. � � . . �y � �- � I ��Y.Y� cP�i�+� ' _ � ������ .l _3 _ .. _ _- - i _ '. .. - ._ti'i � -' T ,' �'a �� A � . sr ^•.-�"s - . : � . . _ � . 1ti�� __ _ � . �3�c'"_ ' '� _ _ . . 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' , - . , , ' F,,;u- .. ^y � . � ,. . . `��.� °' ...s_ Fu nctiona I U I ift p � Basic/Simplified Approaches �---------- ----- __ �.� -----------'----- � L�v�[� r; � A�r � .' i i . � , , . � �-:._ *4.LlJYIAL. aF.f3lkd Pv- � �- � �` l . �.. JAf ..v `}tL� �"au .}6'A]tRv_.. r '?i"� �"�'� - � _ A.'K�LlC � l3Lr ' , ��. 3�M't �1 Nrs� �� c .;��I � k' �.. l fi 'y� t : � � f , _ � � � • . ,� �,�. �'F � . ift`FiCCR � � k� A�,� ' ... ' „ � , � � y�r� Removal of modern 1 sediment to re-connect floodplain (Rosgen Priority 2) Incised channel 2 stabilization to store modern sediment (Rosgen Priority 3) Raise streambed to store modern sediment and tie 3 into modern terrace (Rosgen Priority 1) 22 1. Increase flood storage. 2. Improve groundwater/aquifer recharge by removing cohesive soil layer typical found in modern floodplain (terrace) sediments and exposing the gravel/cobble layer in streambed. 3. Improve surface flow infiltration in floodplain area by removing cohesive soil layer typical found in modern floodplain (terrace) sediments. 4. Decrease channel erosion and downstream sedimentation. 5. Decrease nutrient erosion/loadings to downstream environments. 6. Removal of a sediment and nutrient load sources from floodways. 7. Effective wetland creation in floodplain by frequent runoff event connection. 8. Creation of a long-term geomorphologically stable stream environment. 9. Move stream forward in natural channel evolutionary sequence. 10. Does not attempt to reverse the natural channel evolutionary sequence by restoring the stream system in opposition to the pre-settlement condition. 11. Enhance nutrient uptake of groundwater using an attached vegetated root zone. 12. Enhance nutrient uptake of base flow using an attached vegetated root zone. 13. Enhance nutrient uptake storm flows using an attached vegetated root zone. 14. Enhance nutrient uptake by reattaching the floodplain existing wetland soil and high carbon source. 15. Promote nutrient uptake on floodplain surface by routine inundation of runoff generating events in the vegetated zone. 16. Improve aquatic habitat by promoting retention of organic carbon inputs. 17. Improve aquatic habitat by retention of epifaunal substrate. 18. Improve aquatic habitat by reducing water temperature with groundwater input. 19. Invasive species removal and establish native vegetation. 20. Preserve existing riparian vegetation. �e Fu nction U I ift Potentia l p ��i��oc� �� Bia�iv�ersi� ar�d #�e lif� hisbries �f aquati c ar�d ri parian lii�e PHI�SIC�CHEMfC�.L �� ����-'��Jk,_ `"' " t ,�ti ' ' r � � <<,: �1 '�` � ''y - o . .. .' . .. . . . . ��r,��{�F��if�trr��e �.ir�r�1�� � ik�t�p��sr� �1 #��:u�t�t�si�r� . .. .�. � : � ;:..: ......�,. ..-i�-.a. .�.-,eHY»'t . ..s��. .v��T.�. .l��� ��...�.. ........ . ..rt�.. .w. ...�......T .:��.-.�..... ..�....... ....::...�.-.-....� �..........._-�. - Trar�pa rtaf�ra�7 inom �ie w�iersh�cl �4a �h� �harr�ef 1. Increase flood storage. 2. Improve groundwater/aquifer recharge by removing cohesive soil layer typical found in modern floodplain (terrace) sediments and exposing the gravel/cobble layer in streambed. 3. Improve surface flow infiltration in floodplain area by removing cohesive soil layer typical found in 5. 6. 7. 8. 9. 10. modern floodplain (terrace) sediments. �:W"iia��u�Yo. I�ecrease nutrient erosion/loadings to downs�tream environments. Removal of a sediment and nutrient load sources from floodways. Effective wetland creation in floodplain by frequent runoff event connection. Creation of a long-term geomorphologically stable stream environment. Move stream forward in natural channel evolutionary sequence. Does not attempt to reverse the natural channel evolutionary sequence by restoring the stream system in opposition to the pre-settlement condition. 11. Enhance nutrient uptake of groundwater using an attached vegetated root zone. 12. Enhance nutrient uptake of base flow using an attached vegetated root zone. 13. Enhance nutrient uptake storm flows using an attached vegetated root zone. 14. Enhance nutrient uptake by reattaching the floodplain existing wetland soil and high carbon source. 15. Promote nutrient uptake on floodplain surface by routine inundation of runoff generating events in the vegetated zone. 16. Improve aquatic habitat by promoting retention of organic carbon inputs. 17. Improve aquatic habitat by retention of epifaunal substrate. 18. Improve aquatic habitat by reducing water temperature with groundwater input. 19. Invasive species removal and establi�� o���o^�� ����t�tQ�ao�. 20. Preserve existing riparian vegetatior�. 25 c. i�Vi�i��r� ��uu�Yo�vva����a�'u��Ci i��:iiai�C uy r-�uoYvU'iii� ��i�C��vC �iiii idyCr �y�ii�aV ��'�iiu if� i�iiiU�i�l floodplain (terrace) sediments and exposing the gravel/cobble layer in streambed. � I�r��-n�iP �s_ar�a�� f�na.�a ��fi�tr�t��n�n �� iF�nr�c�nl��r� �ar�� hei �-Pm��sir�� rn���iei� ���� �aei��- t�in�c'�al fnAa�r� in 4. Decrease channel erosion and downstream sedimentation. 5. Decrease nutrient erosion/loadings to downstream environments. 6. Removal of a sediment and nutrient load sources from floodways. 7. Effective wetland creation in floodplain by frequent runoff event connection. y. fV'Vove stream torwardl in natura� channeV evolutionary sequence. 10. Does not attempt to reverse the natural channel evolutionary sequence by restoring the stream system in opposition to the pre-settlement condition. 11. Enhance nutrient uptake of groundwater using an attached vegetated root zone. 12. Enhance nutrient uptake of base flow using an attached vegetated root zone. 13. Enhance nutrient uptake storm flows using an attached vegetated root zone. 14. Enhance nutrient uptake by reattaching the floodplain existing wetland soil and high carbon source. 15. Promote nutrient uptake on floodplain surface by routine inundation of runoff generating events in the vegetated zone. 16. Improve aquatic habitat by promoting retention of organic carbon inputs. 17. Improve aquatic habitat by retention of epifaunal substrate. 18. Improve aquatic habitat by reducing water temperature with groundwater input. 19. Invasive species removal and establi�l� ���o�,�� �����t�ii��. 20. Preserve existing riparian vegetatior�, 26 c. i�Vi�i��r� ��uu�Yo�vva����a�'u��Ci i��:iiai�C uy r-�uoYvU'iii� ��i�C��vC �iiii idyCr �y�ii�aV ��'�iiu if� i�iiiU�i�l floodplain (terrace) sediments and exposing the gravel/cobble layer in streambed. 3. Improve surface flow infiltration in floodplain area by removing cohesive soil layer typical found in modern floodplain (terrace) sediments. 4. Decrease channel erosion and downstream sedimentation. 5. Decrease nutrient erosion/loadings to downstream environments. F. R��nnc�ei�� �n� a���l��P�t ,��� r�w�tr�Pnt Ir�a� �nAarrP� frn� flnc�r��n✓a�ic 8. Creation of a long-term geomorphologically stable stream environment. 9. Move stream forward in natural channel evolutionary sequence. 10. Does not attempt to reverse the natural channel evolutionary sequence by restoring the stream system in opposition to the pre-settlement condition. �r����.a��i� i u�� ��� ��. 1Z. tnhance nutrient uptake ot base f�ow using an attached vegetated root zone. 13. Enhance nutrient uptake storm flows using an attached vegetated root zone. 14. Enhance nutrient uptake by reattaching the floodplain existing wetland soil and high carbon source. 15. Promote nutrient uptake on floodplain surface by routine inundation of runoff generating events in the vegetated zone. 16. Improve aquatic habitat by promoting retention of organic carbon inputs. 17. Improve aquatic habitat by retention of epifaunal substrate. 18. Improve aquatic habitat by reducing water temperature with groundwater input. 19. Invasive species removal and establi�� o���o^�� ����t�tQ�ao�. 20. Preserve existing riparian vegetatior�. 2� c. i�Vi�i��r� ��uu�Yo�vva����a�'u��Ci i��:iiai�C uy r-�uoYvU'iii� ��i�C��vC �iiii idyCr �y�ii�aV ��'�iiu if� i�iiiU�i�l floodplain (terrace) sediments and exposing the gravel/cobble layer in streambed. 3. Improve surface flow infiltration in floodplain area by removing cohesive soil layer typical found in modern floodplain (terrace) sediments. 4. Decrease channel erosion and downstream sedimentation. 5. Decrease nutrient erosion/loadings to downstream environments. 6. Removal of a sediment and nutrient load sources from floodways. 7. Effective wetland creation in floodplain by frequent runoff event connection. 8. Creation of a long-term geomorphologically stable stream environment. 9. Move stream forward in natural channel evolutionary sequence. 1f�, nc��� �nr�t �fitP�nnt tc� �-P���r�� 1��P na�t�>>�-al rh���nPl Pei�a���tinna�rv �Pni�Pnr,P k�ei r��tn.rinr? th� ct�'ea�n ��r�tPrr� 11. Enhance nutrient uptake of groundwater using an attached vegetated root zone. 12. Enhance nutrient uptake of base flow using an attached vegetated root zone. 13. Enhance nutrient uptake storm flows using an attached vegetated root zone. 14. Enhance nutrient uptake by reattaching the floodplain existing wetland soil and high carbon source. 15. Promote nutrient uptake on floodplain surface by routine inundation of runoff generating events in the vegetated zone. 17. Improve aquatic habitat by retention of epifaunal substrate. 18. Improve aquatic habitat by reducing water temperature with groundwater input. 19. Invasive species removal and establi�l� ���o�,�� �����t�ii��. 20. Preserve existing riparian vegetatior�, : c. i�Vi�i��r� ��uu�Yo�vva����a�'u��Ci i��:iiai�C uy r-�uoYvU'iii� ��i�C��vC �iiii idyCr �y�ii�aV ��'�iiu if� i�iiiU�i�l floodplain (terrace) sediments and exposing the gravel/cobble layer in streambed. 3. Improve surface flow infiltration in floodplain area by removing cohesive soil layer typical found in modern floodplain (terrace) sediments. 4. Decrease channel erosion and downstream sedimentation. 5. Decrease nutrient erosion/loadings to downstream environments. 6. Removal of a sediment and nutrient load sources from floodways. 7. Effective wetland creation in floodplain by frequent runoff event connection. 8. Creation of a long-term geomorphologically stable stream environment. 9. Move stream forward in natural channel evolutionary sequence. 10. Does not attempt to reverse the natural channel evolutionary sequence by restoring the stream system in opposition to the pre-settlement condition. 11. Enhance nutrient uptake of groundwater using an attached vegetated root zone. 12. Enhance nutrient uptake of base flow using an attached vegetated root zone. 13. Enhance nutrient uptake storm flows using an attached vegetated root zone. 14. Enhance nutrient uptake by reattaching the floodplain existing wetland soil and high carbon source. 15. Promote nutrient uptake on floodplain surface by routine inundation of runoff generating events in the 16. Improve aquatic habitat by promoting retention of organic carbon inputs. 17. Improve aquatic habitat by retention of epifaunal substrate. 18. Improve aquatic habitat by reducing water temperature with groundwater input. 19. Invasive species removal and establish native vegetation. 20. Preserve existing riparian vegetation. ��; 1. Increased flood storage 2. Improved groundwater/aquifer recharge 3. Improved infiltration on floodplain surface 4. Decreased channel erosion and downstream sedimentation 5. Decreased nutrients to downstream environments 8. Reduced in-channel stresses — long-term geomorphic stability 9. Move stream forward in evolutionary sequence/trend 11. Enhanced nutrient uptake of groundwater via attached root zone 12. Enhanced nutrient uptake of base flow via attached root zone 13. Enhanced nutrient uptake storm flows via attached root zone 14. Reconnection to floodplain wetland soil and carbon source 15. Promote nutrient uptake on fldpin surface by routine inundation 16. Promote retention of organic carbon inputs 17. Promote retention of epifaunal substrate 18. Reduce water temperature with groundwater input 20. Preserve existing riparian vegetation X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Possible � Decrease X X Increase slope Reverse X X X X X Wetting Stress ✓ Connect restored floodplain root zone to groundwater, base flow and flood flow ✓ Promote retention of carbon, sediment and nutrients ✓ Rely heavily on vegetation and native materials for stability (not rock) ✓ Design for frequent floodplain connection (most all runoff producing events) ✓ Target increased flood storage �:� Base credit per foot of stream/floodplain length restored Floodplain root zone reconnection Retention of organic carbon (% aerial coverage) Retention of native/natural epifaunal substrate Increase floodplain storage (% volume 2-yr Storm, < 1 ft depth) Riparian wetland floodplain creation (wetland acres per 100 foot of restored stream/floodplain) Others TBD... 1/1 Groundwater >40% Native, Non- perched >50% >0.35 1/1 Base Flow 40-25 % Native, Perched 50-25 % 0.35-0.25 1/1 < 1-yr Storm 25-10% Supplemental Import 25-10% 0.25-0.15 1/1 > 1-yr Storm <10% Total Import <10% <0.15 . � ues �ons. #�, . � -� a � ����� . � } E� � ..-:rt4f . 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