Loading...
HomeMy WebLinkAbout20020694 Ver 2_Mitigation Report_20160926LITTLE BUGABOO CREEK EEP ID (IMS #56) USACE ACTION ID # 200220955; 200900224 CLOSEOUT REPORT PROJECT TYPE: STREAM Project Setting & Classifications County Wilkes General Location Ronda, Wilkesboro Basin: Yadkin Physiographic Region: Piedmont -Foothills Ecoregion: Northern Inner Piedmont 45e USGS Hydro Unit: 03040101 NCDWQ Sub -basin: 03-07-01 Wetland Classification NA Thermal Regime: Warm Trout Water: No Monitoring Year 2 Fall 2006 Monitoring Year 3 Fall 2007 Project Performers Spring 2007 Source Agency: WRP Provider: WRP/EEP Designer: Earth Tech Monitoring Firm Earth Tech; Ecologic; URS; Equinox Channel Remediation WRC - Biohabitats Plant remediation Equinox Property Interest Holder NCDENR Stewardship Visual and Vegetation Monitoring 2010-2013 Overall Project Activities and Timeline Milestone Month -Year Instituted 2002 Property/CE Dec -02 to Feb -03 Mitigation Plan April 2002 Permitted July 2002 Construction Completed Nov 03 —Feb 04 Repairs May 2004 As -built Survey and Year 1 Apr 2005 Supplemental Planting Apr 2005 Monitoring Year 2 Fall 2006 Monitoring Year 3 Fall 2007 Beaver Control Spring 2007 Monitoring Year 4 Fall 2008 Stream Repairs Aril 2009 Supplemental Planting April 2009 Built EI asset above stock trail crossing April 2009 Monitoring Year 5 Fall 2009 Veg Monitoring Year 6 Spring 2010 Storm Damage Nov 2010 Visual and Vegetation Monitoring 2010-2013 Beaver Control 2011 Livestaking on Mainstem Dormant 2012 Invasives Suppression Growing 2013 Additional Hydro and XS Monitoring 2012-2013 Beaver Control 2012-2013 Closeout Submission Sept 2013 Major Storms May -July 2013 Invasives Suppression Growing 2014 Project Settiniz, Backsround, and Performance Summary The project is in Wilkes County, NC and was designed and permitted in 2002. It is in the western piedmont -foothills with an overall project drainage of about 5 m2 and is part of the Yadkin -Pee Dee River Basin. The watershed is rural with nearly half being forested and just over half in agriculture that includes a significant proportion of pasture with about 2% being low density residential and roadways. Other than the northwestern portion of the watershed, the topography includes significant relief, rolling hills, with many steep valley side slopes, particularly in the projects northeastern and southwestern drainages as well as the —2 miles of mainstem directly above the project (see topographic map below). Many of these valley slopes are maintained as pasture similar to that immediately surrounding the project boundary, which exhibits significant compaction. Collectively, this likely contributes to the somewhat flashy hydrology that has been observed on the site. The project involved the restoration of 3,914 feet of Little Bugaboo Creek, 2,328 feet of an upper and lower tributary and an additional —250 feet of the upper tributary acquired and enhanced in 2009, 4.5 years after the original construction. The latter took place at the same time that channel repairs on the mainstem were completed in 2009 and was driven by the desire to address the significant stressor that this reach represented. This —250 foot segment remained accessible to livestock, had an undersized culvert, and was covered in very large, mature stems of Chinese Privet. Sediments and manure were accumulating in the bed upstream of the culvert in significant quantities and were being periodically flushed down to project reaches. At the very top of this reach was a fenced, forested area with higher slopes. This one 250 foot segment represented a significant stressor that EEP was unable to address with the landowner during the original restoration effort and has subsequently enhanced the protective continuity and function of the project. The restoration plan reported historic channelization of project reaches, unrestricted livestock access, removal of riparian vegetation and the presence of a mill dam just below the project that was estimated to impound water and accumulate fine sediments approximately halfway up the project mainstem (see fig 1 below). The combination of these factors, the aforementioned hydrology, and a significant sediment supply led to extremely severe lateral and vertical instability, as depicted in the pre -construction photos below. The mainstem and lower tributary were described predominantly as F channels with BHRs of 2.3, and 3.9 respectively. The majority of each project reach was devoid of bedform diversity and any instream or riparian habitat. The restoration involved a PII approach with an E channel design target for the mainstem and a C design target for the tributaries specified in the mitigation plan, although the W/D ratios were nearly identical near or at the Rosgen stream type break of 12. The project approach included the installation of a native riparian buffer, livestock exclusion, stabilization of lateral drainage features/draws, construction of more stable channel geometries and the introduction of stream structures for improved habitat, bank protection and grade control. Shortly after construction, the project exhibited areas of adjustment or instability associated with a storm event and the project underwent repair and EEP was dissatisfied with many of the structures built on the lower tributary. The contractors were instructed to rebuild and replace these. Additional areas of concern developed in the year immediately following final construction and took the form of bank erosion primarily on meander bends, many of which had subsequently stabilized/arrested or were tempered with the continued development of vegetation. The bank stability issues primarily occurred on the mainstem between the upper tributary to just below crossing in the middle of the project. In general, many areas demonstrated toe retreat and steepening of bank angles, which is typical of many meandering streams in the piedmont as banks that are not in depostional zones (e.g. point bars) and were originally constructed at lower angles lose their herbaceous cover with the onset of canopy. These areas are not considered areas of concern, because they adjust to these conditions and then remain relatively stable with the woody root mass that has taken the place of the herbaceous cover. However, there were other areas of active scour and mass wasting that did develop. By year 4 and 5 these too seemed to arrest and were not advancing further in terms of severity, frequency, or extent, except for one area upstream and surrounding the confluence with the upper tributary spanning mainstem stations 20+00 to 22+00. Page 2 of 27 The cuts in the outer meanders here were definitely active and prompted the channel repair in this area 2009, which included supplemental planting in other areas along the mainstem with additional livestaking throughout the project. Subsequently, in 2010 a large storm generated other areas of bank erosion on the mainstem and lower tributary and also produced 2 significant structural cutarounds on each reach. The monitoring performed by EEP between 2010 and 2013 indicated that some of these areas stabilized while others have advanced. Additional livestaking on the mainstem was also carried out in 2012. The year 3 report (2007) indicated that the proportion of bank instability ranged from the high single digits to the mid teens, but by year 5 (2009) reporting indicated this had reduced to the low single digits in terms of the proportion of bank which had yet to stabilize. The storm in 2010 increased this upwards again and as of an April 2013 assessment approximately 5.5 and 6% of the mainstem and lower tributary respectively exhibited some form of erosion with about 3% in each case being considered active. Bank pins were installed in July 2012. Of the 35 installed, 6 demonstrated bank retreat in 4 or 5 areas as of April 2013 (ranging from 0.1 to 1.4 feet — Mean = 0.85 feet), with remainder exhibiting no retreat for an overall project mean of 0.15 feet. The cross sections surveyed in year 5 were resurveyed in early 2013 and have shown some adjustment. XS 3 and 4 on the mainstem exhibited some movement, but with concomitant deposition on the opposing bank, while XS 5 is definitely continuing to migrate laterally with some enlargement of the area of XS 6. The latter was primarily toe retreat. XS 1 on the lower trib exhibited a shift of its thalweg to the other side of the stream, while XS2 exhibited stability. Four additional riffle cross sections were shot in 2013, two on the mainstem and two on the lower trib to contribute to the overall riffle mean for comparison to the design cross sectional area. The overall mean riffle area for the mainstem was 53 ft2 (n = 5) in 2013, which compared favorably to the design of 56, but there was variability (-35 — 75 ft). The tributary varied between 21 and 33 for a riffle mean of 27 ft2 , which was the same as the design target. Another significant flood occurred in July 2013, which attained a maximum stage about 3 feet above the bench (see hydrograph below) and demonstrated flows 1-2 feet above baseflow for a 3-4 day period. This was a somewhat rare event with extended flow duration and the channel responded with new scour in some areas and worsening of some existing areas with additional bank pin responses. Of the 35 installed, 25 demonstrated some bank retreat for a mean of 0.66 feet. The total bank erosion amounted to 8 and 6% for the trib and mainstem with 4-5% in each case being considered very active as of the August assessment. However, the flood features are routinely accessed (see over bank hydrology section below). Wrack and fresh deposition were observed frequently throughout the project. The number of overbank events represents a minimum count given the methods used. Examining the crest gage that was put in place in 2012, it can be seen that 2 overbank events were observed in that time frame even with a period of gage malfunction with 2 additional near overbank events. The project was designed and constructed in the earliest period of stream restoration in North Carolina and aspects of project implementation were not in keeping with current practice and understanding and also include what are now identified as risk factors such as: structure placement downstream of meander bends increasing in -channel storage capacity (i.e., pools in the upstream section of riffles/runs); E channel design targets coupled with Priority II approaches absent expansive floodplains and advanced woody vegetation; as well as meandering floodplains. These factors coupled with the aforementioned hydrology and sediment supply as well as the legacy sediments in the valley from the prior impoundment likely contributed to the instability that was observed. However, the proportions of the project channels that demonstrate active instability are relatively small (4-5%) as of the April 2013 observation. Even with these localized areas of instability, the project exhibits good instream habitat and diversity of bedform and the majority of the project is exhibiting stability. The project represents a significant improvement over the pre-existing condition. Although the easement is narrow in some locations, the size, density and diversity of the buffer is generally excellent. Chinese Privet began colonizing the site during the monitoring period but is being treated in 2013 and 2014 along with other invasives, which have emerged. Three of the 14 vegetation plots did not meet the planted density requirements, but averaged about 500 stems per acre. When including volunteers, the average is about 1400 stems per acre ranging from 283 to about 3400. The species count ranged from 3 to 13 per plot with a total of 26 native woody species observed site wide. Page 3 of 27 Goals and Objectives 1. Provide a stable stream channel that neither aggrades nor degrades while maintaining its dimension, pattern, and profile with the capacity to transport its watershed's water and sediment load. 2. Improve water quality and reduce further property loss by stabilizing eroding stream banks. 3. Reconnect the stream to its floodplain or establish a new floodplain at a lower elevation 4. Improve aquatic habitat with the use of natural material stabilizations structures such as root wads, cross vanes, woody debris, and a riparian buffer. 5. Provide aesthetic value, wildlife habitat and bank stability through the creation or enhancement of a riparian zone. 6. Exclude cattle from the riparian zone and establish stable crossings for cattle movement. 7. Stabilize and enhance small drainages entering the site. Success Criteria - None were explicitly stated in the development or AB documents but the following can be inferred 1. Morphological Stability 2. Floodplain access (2 bankful events per 5 year period in separate years) 3. A diverse and adequately dense riparian buffer (using 260 stems per acre criterion) Page 4 of 27 Mitigation Components Restoration Segment/Reach Mitigation Approach Watershed Acreage As -Built Linear Footage/Acreage Creditable Footage Mitigation Ratio Mitigation Units (SMU/WMU) STREAM 6,408 Little Bugaboo Mainstem R 2240 3914 3914 1:1 3914 Upper Tributary -1 R 102 439 439 1:1 439 Upper Tributary -2 E1 249 249 1.5:1 166 Lower Tributary R 890 1889 1889 1:1 1889 Sums 3232 (5*iF7 6491 6491 6408 MITIGATION UNIT TOTALS Stream Mitigation Units Riparian Wetland Non -riparian Total Wetland Riparian Buffer Nutrient Offset (SMU) Units Wetland Units (WMU) 6,408 Page 5 of 27 i.. Figure 1. Li tle`ugarb© y'CrIf4) Asset and orntoting Fe � srp`. ' .d „ y f . ¢ Y1tY1 :i� ,,_ 1 � � et m y +`Maptech@ S S Topogra hic Seri §T"' ©gip echo I 8 933-3000 wv�"w:r�apti�c .com/fopo; • �''�(—j- 7 r. IM'ma \ � opyngh �� .� O 24 C 348 g?/ C 36 y / r G ��♦ h p' �___ 4 Watershed Area 1.39 sq miles f ) 9ps '�-....d°' ij a � -~ �s4�W" `_♦, `2qg � �t , a 4A���J I � 74 � I\ �? � Y '^\ 4°, ~ M tl1 - ,..jam-i,,� �1i�' ! j • •` ( � _� � •' � ♦.. fl_ a /�__ . o,. ♦, .. x996 � r� � � .. .'ate , /F` xry• ` f . �, 1I00 `", >> Site 'f L \� � -l7r 1� . � � \ •Ui, - a. ��, z f - 4�_ �, "�.^rt''��..,. t�' �` lr ,1 �� �,..• ���. Lit jay/-�L l i _. :`�',�} �i i� �j"� \"•O,_ 1996 .fie-,.---�,i "' % ( °�¢,�'`...-� - d 7 l Watershed Area / zJ6 f �r 3.45 sq miles Source: USGS Quadrangles: 0 1,250 2,500 51000 Thurmond, NC, 1971; Ronda, NC, 1971; N.C. Wetlands Restoration Program Roaring River, NC, 1966, Traphill, NC 1968. Feet NCDENR DWQ_ ASHE SURRY FIGURE 4 WILKES Little Bugaboo Creek Watershed AUGA � DKIN Little Bugaboo Creek Restoration Plan - Wilkes County, North Carolina C ELL (�ALEXANDER� IRE D L DW7 . f Easement Boundary Stream Assets Restoration Level t Standard Restoration 1:1 a• Enhancement 11.5:1 - Ilk. Single Sided Easement No Credit � ' ",-JJ� itr' s "4. - Stream Structures�+,y� Prior Beaver Dam Removal Locations . !,+'' �� �y z - ¢'� •'": V 2009 Repair Zone ILI ,.: ., v 'a.1f ��.:`. ^ri moi,' �' _ -•r , IC, Supplemental Planting Area 2009 Outer Meanders in This Area . ,.. Containerized WRC Materials Livestaking Throughout Project 11: �' ^ Fencing Contingency Area 0 400 800 1,600 2,400 3,200 Feet Figure 3. Maintenance Plan View. Legend ---------- Silt fence Road ea; Top of bank --------- Area of disturbance To existing gravel road � � xwe noe.sy aFRM NFNTc 119.. _.. ,,,,'\ -- �VSFRtrAproNFgaFMFryr cs \.20\CROSS SEC F1 ON #3 S 80^ 32 16.4- F \ Install, - '(EMpOR 85727 ' ,.• � _\.. � ... ....� - rock j -hook at r at Station 20+80 .. _ end � y Removed mid -channel bar; reshaped left bank for proper cross-section dimension from station station 21+00 to station 21+80 Installed rock sill to mitigate headcut — Stockpile Area — ' � ' ' ' TFMw sb>FFN•' o&,qRY cF C7 2 + 2 Installed rock j -hook at station 21+90 - t`7 4 N Cg 6 �. xW 107 a tih + 25 s, a J tb ?4 Installed rock to raise elevation of existing cross vane we„ z Access through pasture - S FiyO /oN� Not OS / Plan view map 7saut[o scale. Se `r Vq I 2.S trucn, €plat tit on pI n sheetcpre fo I ton only - .Oereri NF• �` � . Actual placemen[ ahaltfie-duected by Project Coord`f*amr. \ Pyan S e R er_ Const Seque ce - '+z, OT 1'b , 19 Construction Sequence (continued) - g -(EP -P I. Obtain plan approval and other applicable permits A , 12. Shape streambanks to design elevations and construct bankfull benches.Sl*e from the back ofthe bankfull benches toexisting gr i d 2. Stockpile sediment and erostoz8 t:omrolmatenals on site. ar , - elevation not to exceed 2l „install in -stream structures. Covet disturbed ground with salvaged sod mats or seed, fertilize, and cover with coir 3. Stake sensitive areas, construction limits and corridors as indicated on construction plans. matting and/or straw mulch by the e ° 4. Move heavy equipment on site and walk through entire project with contractor. _13 R move pumps and temporary dikes than w within the arm= channel at the end of each day. N 5. Install temporary -gravel constmetumentmnces, as needed. .,,'�Ot _ - 14. Fertilize, lime, seed, and mulch all remaining disturbed areas at the end of each day. '. 6. Install sediment and erosion control measures around staging and stockpiling aresa p `8 15. Upon completing a section, heavy equipment and pumps will be moved to the next section using log mats to cross existing tributaries and ditches_ 7. Haul boulders, mot wads, and logs to the site for building stream structures. et%-� - �'-- 16. Install permanent fencing. 8. Install temporary dikes and pumps necessary to dewater the portion of channel being worked on each day, as necessary. - -- 17. Upon lRimpletion of construction, all remaining disturbed areas will be repaired. 9. Project will be constructed by first replacing the CMP, enhancing the unnamed tributary, and completing maintenance on Little Bugaboo Creekl8. IFemove all equipment and unused construction materials, g y project - 10. Sequence construction an that the Restore the unnamed tributaries dimension and profile from the downstream end, working to upstre_a_ m. 19: FerWize, lime, seed and mulch all remaining disturbed areas. als, includin an trash or waste, from t site. 11. Soil disturbance will be limited to only what work can be accomplished and stabilized on a daily basis. - _ 20 --quer site is ambilized, remove Mlat p ry - g , _�y � i 7 U control measures I MIN CL I nd of each work day. _ _ 21 Install bare -root, container grown, and hi c stake plane material during the domrant gr m season. NORTH CAROLINA WILDLIFE RESOURCES COMMISSION WATERSHED ENHANCEMENT GROUP Little Bugaboo Creek Mitigation Site Maintenance to Little Bugaboo Creek P. O. BOX 387 336-527-1547 OFFICE ELKIN, NORTH CAROLINA 28621 336-527-1548 FAX Wilkes County, North Carolina EEP Project Number: 00056 Little Bugaboo Creek 8 EEP Project Number: 00056 2009 Maintenance Report — Draft, June 2010 Plan View SHEET 1 OF 1 age 12 of 2 UT to Bugaboo Creek/ Project No. 00056 Cross -Section 1 -Pool 1110 1120 1118 UT to Bugaboo Creek XS 2 - Year 2, 3, 4, & 5 Overlay 1109 1108 1112 1107 C 1106 1116 c 1106 1105 0 1110 1104 1109 W 1103 1112 W 1110 1102 1101 1100 1108 1099 1105 1106 0+00 0+10 0+20 0+30 0+40 0+50 0+60 Station 1105 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 Station —F Year 2 - 11/06 f Year 3 - 11/07 X Year 4 - 12/15/08 Year 5 - 12/10/09 Closeout- 2/6/13 1106 0+00 0+20 0+40 0+60 0+80 1+00 Station 2-11106(Year 3- 11/07 —Year 4- 12/16/055 - 12/11/19 —Closeout - 216/13 7t:yy7,:_-7 0 1104 age 12 of 2 Bugaboo Creek / Project No. 00056 Cross -Section 3 - Riffle 1120 1118 UT to Bugaboo Creek XS 2 - Year 2, 3, 4, & 5 Overlay 1112 1107 1111 1116 c 1106 0 1110 1114 1109 1112 W 1110 1108 w 1108 1105 1106 1105 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 Station 1106 0+00 0+20 0+40 0+60 0+80 1+00 Station 2-11106(Year 3- 11/07 —Year 4- 12/16/055 - 12/11/19 —Closeout - 216/13 7t:yy7,:_-7 0 1104 f Year 2 - 11/06 Year 3 - 11/07 Year 4 - 12/16/08 �Year5-12/11/09 —Closeout -216113 age 12 of 2 Bugaboo Creek / Project No. 00056 Cross -Section 4 - Riffle 1113 UT to Bugaboo Creek XS 2 - Year 2, 3, 4, & 5 Overlay 1112 1107 1111 1106 0 1110 1109 1108 w 1107 1105 1106 1105 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 Station 2-11106(Year 3- 11/07 —Year 4- 12/16/055 - 12/11/19 —Closeout - 216/13 7t:yy7,:_-7 0 1104 m w 1103 11102- 1101 1100 1099 0 10 20 30 40 50 60 Station —0--Year2-11/06--+—Year3-11/07—Year4-12/15/08—x— Year 5-12/10/09 Bugaboo Creek / Project No. 00056 Cross -Section 4 - Riffle 1113 1112 1111 0 1110 1109 1108 w 1107 1106 1105 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 Station 2-11106(Year 3- 11/07 —Year 4- 12/16/055 - 12/11/19 —Closeout - 216/13 7t:yy7,:_-7 Bugaboo Creek / Project No. 00056 Cross -Section 6 - Riffle 1100 1099 Left Pin was Bugaboo Creek / Project No. 00056 reset during Cross -Section 5 - Pool 1098 01097 closeout due to failing bank >1096 ^: r "'1095 1104 1094 1102 1093 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 Station —$--Year 1 - 2/06 Year 2 - 11106 Year 3 - 11/07 Year 4 12/16!08 —Year 5 - 12/11/09 Closeout - 216113 1100 1111 0 1109 1098 1107 a0 W 1096 1094 1105 1103 1092 LU -0+10 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 Station Year 1 - 2/06 Year 2 - 11/06 Year 3 - 11/07 - Year 4 - 12/16/08 Year 5 - 12/11/09 Closeout 2/6/13 1099 V V Bugaboo Creek / Project No. 00056 Cross -Section 6 - Riffle 1100 1099 Bugaboo Creek - Year 1, 2, 3, 4, & 5 Overlay (0-2000) 1098 01097 Stations differ between monitoring years. >1096 ^: r "'1095 1094 1093 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 Station —$--Year 1 - 2/06 Year 2 - 11106 Year 3 - 11/07 Year 4 12/16!08 —Year 5 - 12/11/09 Closeout - 216113 Bugaboo Creek - Year 1, 2, 3, 4, & 5 Overlay (0-2000) Stations differ between monitoring years. 1113 1111 1109 1107 a0 to d 1105 1103 LU 1101 - 1099 V V 1097 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Station (ft) Year 1 - 2/06 -Year 2 - 11/06 Year 3 - 11/07 Year 4 - 12/15/08 and 12/16/08 Year 5 - 12/11/09 -2009 Water Surface 2009 Structure Bugaboo Creek - Year 1, 2, 3, 4, & 5 Overlay (2000-4500) Stations differ between monitoring years. UT to Little Bugaboo Creek 1102 Longitudinal Profile, Year 2 and 3 Overlay 1100 Overlay adjusted by matching cross section 1. 1098 0 1096 - � - 0 1094 °' 1100- 1095_.... w 1092 - _ - 1090 iw= LU 1088 1085 1086 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Station 1084 Year 2 - 11/06 -Year 3 - 11/07 Year 4 - 12/15/08 Water Surface 2008 Structure 1082 2000 2500 3000 3500 4000 4500 Station (ft) Year 1 -2/06 Year 2 -11/06 Year 3 -11/07 -Year 4 -12/15/08 and 12/16/08 Year 5 - 12/11/09 -2009 Water Surface • 2009 Beaver Dam 2009 Structure UT to Little Bugaboo Creek Longitudinal Profile, Year 2 and 3 Overlay Overlay adjusted by matching cross section 1. 1115 0 1110 -'- 1105 - � - °' 1100- 1095_.... - _ - iw= 1090 1085 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Station Year 2 - 11/06 -Year 3 - 11/07 Year 4 - 12/15/08 Water Surface 2008 Structure Table VIII: Morohologv and Hvdraulic Monitoring Summary Table VIII: Mornhologv and Hvdraulic Monitoring Summary (cont.) Table 11a. 2013 Morphology & Hydraulic Monitoring Summary Little Bugaboo Mainstem Unnamed Tributary EEP Project Number 00056 XS -3 Riffle XS -4 Riffle XS -5 Pool Little Bugaboo Creek UT Project Number 00056 XS -1 Riffle - XS -8 Riffle Extra Extra Parameter Parameter 1112.8 Cross Section 1 Pool 1100.2 1096.5 Cross Section 2 Riffle 995.669 XS -2 Riffle Dimension Parameter MY3 MY4 MY5 Cross Section 3 Riffle MY3 MY4 MY5 Cross Section 4 Pool 23.5 13.8 Cross Section 5 Pool 15.6 18.8 17.4 Cross Section 6 Riffle 12.6 14.7 Dimension Myl MY2 MY3 MY4 MY5 MYI MY2 MY3 MY4 MY5 MYl MY2 MY3 MY4 MY5 MYl M12 MY3 MY4 MY5 BF Width (ft) 27.1 19.3 22.4 20.8 45.6 20.6 14 22.6 22.5 17.5 31.3 27.3 19 17.3 19.6 17.8 13.3 13.2 15.7 20.9 Floodprone Width (ft) 91.3 91 80.5 95 95 68.8 49.3 >50 >50 60 52.8 >50 8.2 >55 >55 55 39 45 38 45 45 BF Cross Sectional Area (ft) 63.2 45.7 51.3 60.5 65.2 34 21.6 42.4 41.7 37.1 47 31 39.2 42.1 59.2 20.6 23.1 21 23.5 42.6 BF Mean Depth 2.3 2.4 2.3 2.9 1.4 1.7 1.5 1.9 1.9 2.1 1.5 1.1 2.1 2.4 3 1.2 1.7 1.6 1.5 2 BF MaxDepth 4.7 4.2 3.2 4.4 5.1 3.7 2.6 2.9 3.7 3.5 5 4.4 4.6 4.5 5.2 2.4 2.5 2.2 2.3 3.3 Width/Depth Ratio 11.6 8.2 9.7 7.2 31.9 12.5 9.1 12 12.2 8.3 20.8 24.1 9.2 7.2 6.5 15.5 7.7 8.3 10.5 10.3 Entrenchment Ratio 3.4 4.7 3.6 4.6 2.1 3.3 3.5 >2.2 >2.2 3.4 1.7 >1.8 >2.9 3.2 2.8 2.2 3.4 2.9 2.9 2.1 Bank Height Ratio 1 1.4 1 1 -- I 1 1 1 -- 1.4 1 1 1 -- 1 1 1 1 Wetted Perimeter (ft) 30 21.8 24.2 24 49.6 22.9 15.8 24.3 25 19.5 36.2 32.4 24.1 22.5 25.8 19.3 14.8 15.3 17.6 24.1 Hydraulic radius (ft) 2.1 2.1 2.1 2.5 1.3 1.5 1.4 1.7 1.7 1.9 1.3 1 1.6 1.9 2.3 1.1 1.6 1.4 1.31 1.8 Substrate d50 (mm) 5 6 7 1.8 3.5 0.29 13 1.1 9.9 18 0.29 0.94 0.69 0.2 0.45 21.13 48 46 6.9 45 P84 (mm) 151 64 181 181 38 2.33 59 1.7 371 1101 2 481 30 11 6 54.5 130 90 31 110 Table VIII: Mornhologv and Hvdraulic Monitoring Summary (cont.) Table 11a. 2013 Morphology & Hydraulic Monitoring Summary Little Bugaboo Mainstem Unnamed Tributary EEP Project Number 00056 XS -3 Riffle XS -4 Riffle XS -5 Pool XS -6 Riffle XS -1 Riffle - XS -8 Riffle Extra Extra Parameter Parameter 1112.8 Cross Section 1 Pool 1100.2 1096.5 Cross Section 2 Riffle 995.669 XS -2 Riffle Dimension MYl MY2 MY3 MY4 MY5 MYl MY2 MY3 MY4 MY5 BF Width (ft) 23.5 13.8 15.1 14.6 15.6 18.8 17.4 14.8 12.6 14.7 Floodprone Width (ft) 52 >42.7 2.5 >47 >45 >45 2.5 32.4 >81.0 15.1 >50 >51 >51 BF Cross Sectional Area (ft) 38.3 23.3 25.5 29.3 33.3 30.7 30.5 26.9 28 32.3 BF Mean Depth 1.6 1.7 1.7 2 2.1 1.6 1.8 1.8 2.2 2.2 BF Max Depth 3.8 3.5 3.7 3.5 3.7 3.2 3.2 3.1 3.5 3.8 Width/Depth Ratio 14.4 8.2 9 7.3 7.3 11.5 9.9 8.2 5.7 6.7 Entrenchment Ratio 2.2 >3.1 >3.1 3.1 2.9 1.7 >4.7 >3.4 4 3.5 Bank Height Ratio -- 1 1 1 1 -- 1 1 1 1 Wetted Peritneter (ft) 25.7 17.5 18.2 18.9 19.8 20.7 19.6 17.8 15.3 17.6 Hydraulic radius (ft) 1.5 1.3 1.4 1.6 1.7 1.5 1.6 1.5 1.8 1.8 Substrate d50 (mm) 0.2 12 0.38 8.9 4.3 23.4 22 55 7.1 9.4 P84 (mm) 0.71 681 901 451 23 51.31 681 1001 341 33 Table 11a. 2013 Morphology & Hydraulic Monitoring Summary Little Bugaboo Mainstem Parameter Dimension XS -3 Riffle XS -4 Riffle XS -5 Pool XS -6 Riffle XS -1 Riffle - XS -8 Riffle Extra Extra Parameter Record Elevation (datum) Used 1112.8 1109.7 1100.2 1096.5 998.155 995.669 XS -2 Riffle Bankfull width (ft) 20.7 19.4 45.2 19.4 30.4 14.8 Floodprone Width (ft) >97.2 >50 >100 >50 >50 >30.3 Record Elevation (datum) Used Bankfull Mean Depth (ft) 3.1 2.6 2.5 2.0 2.5 2.3 15.1 Bankfull Max Depth (ft) 1 4.8 1 3.4 1 6.5 1 3.1 4.3 3.2 62.9 Bankfull Cross Sectional Area(ft') 64.1 50.8 114.2 38.7 75.2 34.5 Bankfull Max Depth (ft) Bankfull Width/Depth Ratio 6.7 7.4 17.9 9.7 12.3 1 6.3 33.4 Bankfull Entrenchment Ratio >4.7 1 >2.6 1 >2.2 >2.6 >1.6 1 >2.1 0 12 Bankfull Bank Height Ratio 1.0 1 1.2 1 1.0 1.0 1.0 1.0 Table Ila. 2013 Morphology & Hydraulic Monitoring Summary UT to Little Bubaboo Parameter XS-UT1 XS-UT2 XS -1 Pool XS -2 Riffle Riffle Dimension Riffle Extra Extra Record Elevation (datum) Used 1104.430 1103.213 999.666 994.556 Bankfull Width (ft) 18.6 15.1 11.5 15.0 Floodprone Width (ft) >50 >50 >50 62.9 Bankfull Mean Depth (ft) 2.0 2.2 1.9 1.8 Bankfull Max Depth (ft) 3.4 3.3 2.8 2.6 Bankfull Cross Sectional Area(ft) 36.3 33.4 21.4 27.1 n-L4;M Alr.,t.h/n-.t, n.,.:,. n c a o c 1 0 12 Overbank Events -Bugaboo Creek Date of Observation Date of Occurrence Method(s) s 2/4/2005 Unknown Floodplain Indicator Photos 12/2/2007 Jan -07 USGS Proxy 12/16/2008 Aug -08 USGS Proxy 12/16/2008 Nov -08 USGS Proxy and Photos Doc 12/10/2009 Unknown USGS and Photo Doc 1/29/2010 Jan -10 Photo Doc - Fresh deposition and wrack 1/28/2011 Unknown Photo Doc - Fresh deposition and wrack 12/26/2012 12/26/2012 90% bankfull occurrence 1/17/2013 1/17/2013 Continuous Stage Recorder 1/30/2013 1/30/2013 95% bankfull occurrence - Continuous Rec 7/5/2013 7/5/2013 12 X bankfull - Continuous Rec Little Bugaboo 7 fi s a C+ W .Approximate Rankfull 3.5 Feet 3 2 I Gauge Malfunction u Page 16 of 27 Page 17 of 27 ... (MY6 2010) Callicarpa americana Fagusgrandifolia 'American beech Fraxinuspennsylvanica Pinusvirginiana Platanus occidental is Sambucus canadensis Stem count size (ares) 0 0 0 ©d ©0 0 0 0 0 0 0 0 size (ACRES) Species count Stems perACRE Page 17 of 27 EEP Recommendation and Conclusion Although some localized areas of instability remain and some severe, they were attributable to the factors outlined above and the proportions of the project channels that demonstrate active instability are relatively small (-4-5%) as of the August 2013 observation. Even with these localized areas of instability, the project exhibits good instream habitat and diversity of bedform and the majority of the project is exhibiting stability. Its floodplain is accessed regularly and the size, density and diversity of the woody vegetation is excellent. The project represents a significant improvement over the pre-existing condition and EEP recommends regulatory closure as proposed. Contingencies After groundtruthing the easement shape that EEP was in possession of, one area (see project remediation map above) below the confluence with the upper tributary was thought to be in error. However, GPS data used to perform that groundtruthing were later proved faulty and the easement shape as depicted above is in fact correct, indicating that approximately 300 feet of fencing will be moved outward to match the correct easement line. The current buffer widths range from a minimum of 27 feet to 69 feet (mean of 46 feet) spanning this area. Page 18 of 27 Pre -Construction Photos Page 19 of 27 go-, • Pfm ', MEW Q } qv 7 / 1,r11• � r t i/ l w 411 Post -Construction Photos APPENDIX A - Watershed Planning Summary 56 — Bugaboo Creek The Bugaboo Creek project (located on Little Bugaboo Creek) is located in the Bugaboo Creek Targeted Local Watershed (TLW), as identified in the 2009 River Basin Restoration Priorities RBRP document for the upper Yadkin River basin (EEP, 2009). The Bugaboo Creek TLW (14 -digit hydrologic unit 03040101070010) is 24.6 square miles in area and drains a predominantly rural/agricultural landscape in northeastern Wilkes County, just north of the town of Ronda. The TLW is characterized by 44% agricultural cover, 25% degraded (non -forested) riparian buffers, 15 animal operations and 39% water supply watershed (WSW) waters. Impervious cover is less than one percent. Neither Little Bugaboo Creek nor Big Bugaboo Creek (into which Little Bugaboo flows) are noted as impaired or impacted by DWQ in the most recent basin plan (2008 Yadkin -Pee Dee River Basin Plan) or the 2012 303(d) list. However, there are no DWQ monitoring stations on Little Bugaboo Creek. No NC NHP significant natural heritage areas (SNHAs), natural heritage element occurrences (NHEOs) or NC WRC priority aquatic habitats are documented within the TLW. Major watershed stressors identified within the 8 -digit CU comprising the Yadkin River Headwaters (03040101), which affect some stream reaches within the Bugaboo Creek TLW, include in -stream sedimentation (from unstable stream banks and agricultural runoff) and degraded riparian buffers. As stated in the 2009 RBRP, primary CU goals include limiting inputs of sediment, nutrients and fecal coliform bacteria from active farming operations, the implementation of agricultural BMPs within high-priority subwatersheds, and the restoration of water quality and aquatic habitat within impaired or degraded stream reaches. There are no other EEP mitigation projects within the Bugaboo Creek TLW. There are several agricultural BMP sites that have been implemented within this TLW since the mid-1990s [see Figure A-1 below], funded through the Ag Cost Share program, according to data provided by Tom Hill (NC Department of Agriculture & Consumer Services — Division of Soil and Water Conservation). The specific BMP types include grassed waterways, livestock exclusion/fencing, vegetative filter strips, waste storage ponds, pasture renovation, stock trails, cropland conversion (to grasses), and new/alternate watering sources (wells, troughs, tanks). There is also one agricultural BMP site within the TLW that was funded by the NC Clean Water Management Trust Fund program in 2002. Project documents indicate that pre -restoration conditions at the Bugaboo Creek project site included actively eroding stream banks, degraded riparian buffer vegetation, excessive cattle grazing and unrestricted access of livestock to Little Bugaboo Creek and tributaries. The EEP Bugaboo Creek restoration project has resulted in the restoration of more than a mile of stream channel, the planting/restoration of riparian buffer acreage and the installation of farm BMPs (including exclusion fencing and alternate watering sources). The Bugaboo Creek project should directly benefit aquatic habitat and water quality by significantly increasing stream stability and nutrient filtration, thereby reducing local sediment and nutrient inputs, as well as fecal coliform bacteria. APPENDIX A - Watershed Planning Summary Figure A-1. Bugaboo Creek Project Site and EEP TLWs Little' Wer 8 Bru Creek _ v SURRY �i Bugaboo � - h,Ttchell Rives ■ j% � �i. jib ,/ �// j j j CPE2k. VIVILi(ES Edon - 0 �/9- n Janesville _ e iYADMN Upper Yadkin 1 v trwM,,_b,d -` Kerr Scutt s U r c EEF• C4. Reservoir LWP « Legend , ❑ EEP Projects- 2013 Closeouts • EEP Projects (Tier lr = Agricultural BM Ps (Yadkin 01) - 319 Projects H—twn Creex 1 DAIMTF Sites 0 EEP Local Watershed Plans IN � EEPTargeted Local Watersheds WE EEP 2013 Project Closeout 0 1 2 4 O Catalog Units 1�` Mlles ® County Boundaries s Bugaboo Creek'Y'adkin3U4Q141) Rev_ 12June2013 Appendix B. Land Ownership and Protection SITE PROTECTION INSTRUMENT The land required for the construction, management, and stewardship of this mitigation project includes a portion of the following parcels. http://www.nceep.net/GIS DATA/56 BugabooCreek.pdf LONG-TERM MANAGEMENT PLAN Upon approval for close-out by the Interagency Review Team (IRT), the site will be transferred to the DENR Stewardship Program, which will be responsible for periodic inspection of the site to ensure that restrictions required in the conservation easement are upheld. Site Protection Deed Book & Acreage Grantor County Instrument Page Number protected Bowman Bauguess and wife, Wilkes Conservation DB 898, P 432 1.330 Nancy Bauguess Easement Frank K. Bright and wife, Jannette H. Bright Wilkes Conservation DB 898, P 385 0.010 Easement Charles N. Jordan and wife, Geraldine Jordan; Kenneth Jordan, and wife, Margaret Wilkes Conservation DB 903, P 317 3.820 Easement Jordan Charles W. Woodie and wife, Gloria Woodie Wilkes Conservation DB 904, P 380; 7.046 Easement DB 1082, P 289 Charles N. Jordan and wife, Geraldine Jordan Wilkes Conservation DB 907, P 122 1.720 Easement http://www.nceep.net/GIS DATA/56 BugabooCreek.pdf LONG-TERM MANAGEMENT PLAN Upon approval for close-out by the Interagency Review Team (IRT), the site will be transferred to the DENR Stewardship Program, which will be responsible for periodic inspection of the site to ensure that restrictions required in the conservation easement are upheld. U.S. ARMY CORPS OF ENGINEERS Wilmington District Action ID: 200220955 County: Wilkes GENERAL PERMIT (REGIONAL AND NATIONWIDE) VERIFICATION Property Owner NC Wetlands Restoration Program Attn: Jeff Jurek _ Address 1619 Mail Service Center Ralei h NC 27699-1619 Telephone Number 336-733-5208 Authorized Agent NA Address Telephone Number. Size and Location of Fro er wnterbod ffi-thw4d One/number town etc.: The project is located along Bugaboo Creek and Little Bugaboo Creek, north of Roaring River, Wilkes County, North Carolina. The site is located in the 'Yadkin River Basin,. _Description of Activity: This permit authorizes stream channel excavation and relocation, the placement of Fill material (stream diversion plugs), and the installation of in -stream structures (including coir fiber rolls, log and rock vanes, root wads, riprap, etc.) associated with the construction of the little Bugaboo Stream Restoration Project. Impacts to existing waters of the U.S. authorized by this permit total 6,30 linear feet of stream channel. Sec attached special conditions. Applicable Law: _XSection 404 (Clean Water Act, 33 USC 1344) only. Section 10 (River and Harbor Act of 1899) only_ Authorization: Regional General Permit Dumber 2� Nationwide Permit Number Any violation of the conditions of the Regional General or Nationwide Permit referenced above may subject the permittee to a stop work order, a restoration order, and/or appropriate legal action. This Department of the Army Regional General :Permit or Nationwide Permit verification docs not relieve the permittee of the responsibility to obtain any other required Federal, State, or local approvals/permits. The permittee may need to contact appropriate State and local agencies before beginning work. If you have any questions regarding the Corps of Engineers regulatory program, please contact Todd Tugwell at telephone number_ (919) 876 - 8$41 extension 26 Regulatory Project Manager Signature Authorization Date July 15, 2002 Expiration Date Jut 15 21104 SURVEY PLATS, FIELD SKETCH, WETLAND DELINEATION FORM, ETC., MUST BE ATTACHED TO THE YELLOW (FILE) COPY OF THIS FORM, IF REQUIRED OR AVAILABLE. CF: T,nn/7nn•; OTAQ:# eg'i ZKd Z�VSn EZ899L86t6 LZ=80 ZOOZ,9Z'�nv U.S. ARMY CORPS OF ENGINEERS Copy WILMINGTON DISTRICT Action ID. 200900224 County: Wilkes USGS Quad: Ronda GENERAL PERMIT (REGIONAL AND NATIONWIDE) VERIFICATION Property Owner / Authorized Agent: North Carolina Ecosystem Enhancement Program Address: ATTN: Mr. Gregory Melia 1652 Mail Service Center Raleigh, NC 27699-1652 Telephone No.: 919-715-0476 Size and location of property (water body, road name/number, town, etc.): The project site is located off Hoots Road (SR 2014) approximately 3 miles northwest of Ronda, in Wilkes County, North Carolina. The water bodies include Little Bugaboo Creek and an unnamed tributary to Little Bugaboo Creek, both are within the Yadkin River Basin. Description of projects area and activity: This permit MODIFICATION verifies permanent impacts to 200 linear feet of stream channel within Little Bugaboo Creek for the purpose of restoring damaged areas of a previous restoration site (NWP 3). In addition, permanent impacts to 285 linear feet to an unnamed tributary to Little Bul4aboo Creek are verified for stream enhancement (NWP 27). All work must be in compliance with the plans attached to the permit application. Since the purpose of this work is stream restoration, no compensatory mitigation is required. This permit contains Special Conditions (please see below). Applicable Law: ® Section 404 (Clean Water Act, 33 USC 1344) ❑ Section 10 (Rivers and Harbors Act, 33 USC 403) Authorization: Regional General Permit Number: Nationwide Permit Number: 3 and 27 Your work is authorized by the above referenced permit provided it is accomplished in strict accordance with the attached conditions and your submitted plans. Any violation of the attached conditions or deviation from your submitted plans may subject the permittee to a stop work order, a restoration order and/or appropriate legal action. This verification will remain valid until the expiration date identified below unless the nationwide authorization is modified, suspended or revoked. If, prior to the expiration date identified below, the nationwide permit authorization is reissued and/or modified, this verification will remain valid until the expiration date identified below, provided it complies with all requirements of the modified nationwide permit. If the nationwide permit authorization expires or is suspended, revoked, or is modified, such that the activity would no longer comply with the terms and conditions of the nationwide permit, activities which have commenced (i.e., are under construction) or are under contract to commence in reliance upon the nationwide permit, will remain authorized provided the activity is completed within twelve months of the date of the nationwide permit's expiration, modification or revoca(ion. unless discretionary authority has been exercised on a case-by-case basis to modify, suspend or revoke the authorization. Activities subject to Section 404 (as indicated above) may also require an individual Section 401 Water Quality Certification. Y'ou should contact the NC Division of Water Quality (telephone (919) 733-1786) to determine Section 401 requirements. For activities occurring within the twenty coastal counties subject to regulation under the Coastal Area Management Act (CAM A), prior to beginning work you must contact the N.C. Division of Coastal- Management . This Department of the Army verification does not relieve the permittee of the responsibility to obtain any other required Federal, State or local approvals/permits. If there are any questions regarding this verification, any of the conditions of the Permit, or the Corps of Engineers regulatory program, please contact Monte Matthews. Permit Condition: 1) Due to previous information concerning this site and the overall need for repair work, additional monitoring will be required. Therefore, the 5 (five) year monitoring period will restart with the implementation of impacts verified under this permit. If 3 (three) consecutive years of monitoring shows a successful and stable project, the Corps Representative may eliminate the remaining 2 years of monitoring. 2) Since the restoration work to the unnamed tributary is for mitigation, all standard 5 -year monitoring requirements apply. Page 1 of 3 Corps Regulatory Official: Monte Matthews �!!—� •� Date: February 13, 2009 Expiration Date of Verification: February 13, 2011 The Wilmington District is committed to providing the highest level of support to the public. To help us ensure we continue ro do so. please complete the Customer Satisfaction Survey located at our website at http://I'eeulatory.usacesurvey.comi to complete the survey online. Page 2 of 3 Mitigation Project Name Bugaboo Creek EEP IMS ID 56 River Basin YADKIN Cataloging Unit 03040101 Armlied 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 1:1 3:1 0.5:1 1:1 1:1 Information from EEP Debit Ledger dated 08/09/2013 E E° EE```3oo E dEo W ytL A E m L D:O O. m0oEm Z 2Z L Z W ir/,N p d z` L IO W UM L o m 0 U L n E m L U W LI U a L7COO C 2. yU `� N �� 3 E w y0t 0W �'m Z Z Beginning Balance (feet and acres) 6,242.00 249.00 NCDOT Pre-EEP Debits (feet and acres): Not Applicable EEP Debits feet and acres): DWQ Permits USACE Action IDs Impact Project Name NCDOT TIP R -2239C - 1999-0492 1999-20833 Widening of US 421 6,141.00 133.50 Remaining Balance (feet and acres) 101.00 115.50 Information from EEP Debit Ledger dated 08/09/2013