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HomeMy WebLinkAbout20052255 Ver 1_Emails_20060919wuuu ivtvuutaui t aua Subject: FW: Round Mountain Falls From: "Rebekah Newton" <rebekah@wetland-consultants.com> Date: Tue, 19 Sep 2006 14:10:44 -0400 To: <ian.mcmillan@ncmail.nev -----Original Message----- From: Rebekah Newton [mailto:rebekah~wetland-consultants.com] Sent: Tuesday, September 19, 2006 1:51 PM To: 'ian.mcmillain@ncmail.net' Subject: Round Mountain Falls Ian, Please reference DWQ Project # 05-2255. I took Kevin Barnett out to Round Mountain Falls last week to review the stream calls on site. To avoid an additional "add info" letter, he recommended that I send you some information regarding our potential response to the August 17, 2006 letter. The attached information should address the three concerns outlined in your letter. Z would like to know if you feel like this information will be sufficient enough for the Raleigh Office to issue the 401 permit. If so, I will package this information and mail it to yau, if not, I would like to speak with you regarding any lacking information. Please contact me via email or phone should you have any questions. Thank you. Rebekah L. Newton Wetland and Natural Resource Consultants Post Office Box 862 Canton, North Carolina 28716 828-713-1930 ~i Content-Type: application/pdf ;Round Mountain Restoration Map 09.19.06.pdf Content-Encoding: base64 .Content-Type: application/msword .Round Mountain Crass Sections 09.19.06.doc Content-Encoding: base64 Round Mountain Impacts Table 09.19.06.x1s'; Content-Type: application/vnd.ms-excel Convent-Encoding: base64 Round Mountain PDP Data 09.19.06.x1s Content-Type: application/vnd.ms-excel Content-Encoding: base64 ;';.Round Mountain Restoration - Mitigation Plan 09.19A6.doc Content-Type: application/msword Simplied Impact Table Round Mountain Channel Impact Summary Sheet For Phases 2-4 Road Crossin # Existin Im act Pro osed Im act New Im act linear feet linear feet linear feet A erennial channel 0 20 20 B intermittent channel 0 20 20 I erennial channel 0 20 20 Phas e 2 C erennial channel 0 20 20 H erennial channel 0 20 20 24 erennial channel 0 36 36 26 erennial channel 0 36 36 27 erennial channel 20 36 16 28 intermittent channel 0 36 36 31 erennial channel 0 36 36 32 erennial channel 0 36 36 33 erennial channel 0 30 30 34 erennial channel 0 30 30 Phase 3 35 erennial channel 0 30 30 36 erennial channel 0 36 36 37 erennial channel 0 36 36 38 intermittent channel 0 36 36 39 intermittent channel 0 36 36 40 erennial channel 0 36 36 41 intermittent channel 20 36 16 Phase 4 42 intermittent channel 20 36 16 43 erennial channel 20 36 16 46 erennial channel 0 30 30 TOTALS INTERMITTENT 40 TOTALS PERENNIAL 40 TOTAL ALL CHANNELS 80 200 160 524 484 724 644 Mitigation for All Impacts in All Phases Stream T e and Miti ation Form Len th Miti ated for: Miti ation Ratio Total 1 Perennial, Restoration 305 1:1 305 2 Perennial, Preservation 255 80:1 20400 3 Intermittent, Preservation 233 10:1 2330 793 23035 Round Mountain Falls Restoration -Mitigation Plan Transylvania County, North Carolina September 19, 2006 Prepared by: PO Box 882 Canton, NC 28716 Executive Summary The developer of Round Mountain Falls, McKeough Land Company, Inc., proposes this mitigation plan to restore approximately 305 linear feet of channel up- and downstream of existing road crossings and preserve approximately 23,035 linear feet of stream channel. The plan, ns outlined within this document, serves as guidance for the proposed mitigation. RESTORATION Restoration will be: • removal of fill dirt associated with the rood crossing • removal of pipes, rip-rap, logs or other crossing structures • creation of aquatic habitat using rock • stabilization of stream bank with fine grading • installation of topsoil • temporary seeding to aid in stabilization • planting of stream banks and riparian buffers with permanent vegetation Project oversight will be provided by WNR staff to ensure proper techniques and success; and to propose modifications during the construction process, if necessary. Restoration success will be measured in terms of stream aquatic life and stream buffer plant survival. Construction Plnn and Specifications The restoration process will begin with the removal of fill dirt used in the road crossing. Then the pipe, rip rap, and any other stream implements will be removed. All attempts will be made to recreate the channel, stream bank slopes, and angles to the condition they were on the site prior to disturbance. Because all of the sections of channel proposed for restoration are at old road crossings, they have been straightened. Sinuosity will be added to the channel such that the restored channel will be 1.2 times its original length within the some straight line distance. At this point we will begin to harvest on site materials to be used in the restoration process. Materials such as topsoil, vegetation, and rock will be harvested on site during other construction activities from areas of similar slope and aspect. Once the stream is restored, focus will move on to the stream banks. Topsoil harvested on site will be added to the stream banks at a minimum depth of six inches. No soil amendments (fertilizer) will be added in order to keep the system as natural as possible and to prevent any excess nutrient runoff into the stream. Fine grading will be used when necessary to recreate side slopes and micro-topography will be used for soil stabilization and to minimize runoff. Planting Plnn and Specifications The stapes will be planted with appropriate riparian species from an approved list (Attachment D) to recreate the natural buffers which occur on site. Rosebay Rhododendron will be planted densely along the stream channel to provide shade, woody debris, and to mimic the natural system present on site. Rosebay Rhododendron and Dog-Hobble will be planted at a dense ratio toward the outer edge of the stream buffer to minimize re-colonization by invasiv~z exotic species and mimic natural conditions on the site. In the rest of the area, trees and shrubs will be mixed and the planting arrangement will be on 10 ~; 10 foot spacing, which will result in 436 stems per acre. Tree shelters may be used to accelerate growth and increase survivability. All permanent vegetation will be harvested on site to ensure they are suitable native species. During other construction, vegetation from similar slope and aspect will be harvested. This vegetation will be properly excavated and prepared for transport in order to minimize damage and ensure survivability. These plants will then be planted in the riparian buffer zone. This procedure will occur this spring before the sap begins to rise, in order to reduce transplant mortality. The contractor will assure percolation of all planting beds/pits prior to installation. Large trees will be anchored into the ground ns necessary. The objective will be to mimic most of the natural buffer that is on site, which is mainly composed of shrubs and trees. However, warm season grasses will be used, in accordance with the "Warm Season brass Establishment and Management in North Carolina and Virginia" providc;d by the US Fish and Wildlife Service as a temporary planting to aid with soil stabili;:ation. Plant Material Specifications Bare Root or Container (Herbaceous): The plants will either be ordered as bare root or in 1-quart containers. Plants will be planted immediately upon delivery. Plants will be stored in shade and kept moist otherwise. Once planted, the specimens shall appear healthy with no leaf spots, leaf damage, leaf discoloration, chlorosis, leaf wilting or curling, or evidence of insects on leaves or stems. Balled and Bagged (Woody Plants): The size of the earthen ball shall at least meet the minimum requirements in the American Standard for Nursery Stock (1980). Where plants are to be planted in saturated soils, the bagged root ball shall have a surface diameter that is at least z of the diameter of the un- pruned drip-line and a depth that is at least 8" per 5' of tree/shrub height. The hole for the tree/shrub will be the rootball diameter plus 12" around the outer edge. The crown of the rootball will be placed 1" above finish grade. Plants will be planted immediately upon delivery. If this does not occur, plants shall be stored in shade and root balls kept moist through periodic watering until the time of planting. Once growing, the plants shall appear healthy with no leaf spots, leaf damage, leaf discoloration, chlorosis, leaf wilting or curling, or evidence of insects on leaves. Container (Woody Plants): The soil within the root ball shall be field capacity (1/3 atmosphere) or wetter upon delivery to the job site. Any wilted, dry and/or lightweight plants shall be rejected. Plants shall be planted immediately upon delivery. If not then they must be stored in shade and root balls kept moist through periodic watering until time of planting. The shrub species will be either 2' to 3' or 3' to 4' in height. The tree species will be 7' minimum for the Willow and Sycamores. Soil and root mosses must at least meet the minimum required container size. If soil/root masses are substantially smaller, soil around the root mass is loose, indicating the plant has not been in the container long enough to root itself, it shall be rejected. If growing, plants shall appear healthy with no leaf spots, leaf damage, leaf discoloration, chlorosis, leaf wilting or curling, or evidence of insects on leaves. For trees and shrubs, where spiraling woody roots exist on the outside of the soil/root mass upon the removal of plants from the containers, the landscape contractor shall separate (cutting where necessary) and spread them out prior to planting. Planting Specifications All areas between shrubs/trees will receive 3" of mulch. The contractor will assure percolation of all planting beds/pits prior to installation. Large trees will be anchored into the ground with a'Duckbill' Model No. 88-DTS-O earth anchors or approved equal. Evergreen trees will be anchored with three 2"x2"x8' evenly spaced stakes and tied with recycled tire tree ties as manufactured by Grostrait or approved equal to promote n straight growth pattern and prevent wind impacts. Fertilization Woody Vegetation: Fall/Winter plantings-Use Osmocote 18-5-11, twelve to fourteen month release fertilizer, to be placed in hole or in soil fill/amendment mix at planting. Use grams (1 ounce) per 1-quart container, 90 grams (3 ounce) per 1-gallon container (30 grams per each additional gallon). Use 15 grams (1 ounce) per un-rooted cutting for willow whips (if used). Soil Amendments: Soil amendments are required around tree and shrub plantings. The amendments used should be leaf or pine bark compost nt rates of one part compost to one part soil (from planting hole). Fertilizer should be mixed in with soil amendment mix. No surface mulch is required where plants are planted at or near original grade, unless tree shelters are used to promote growth and survival percentage. A 6" soil berm will be constructed 12" from the outer edge of the rootball to hold water. Monitoring Upon completion of construction, WNR staff will provide the resource agencies with photos of each site and a baseline monitoring report. A monitoring report with photos will be submitted annually for 5 years. Success will be measured in terms of plant survivability and utilization of the area by terrestrial and aquatic species. Timetable for Restoration The stream restoration project will likely begin this summer. Once the infrastructure within the areas proposed for restoration has been completed, the restoration work will begin. The following timetable is presented for restoration work once the road removal is complete. Ranges are given below to allow for rain days and other unexpected delays. • 1 week to remove exitsing impacts and open channels o Remove road fill, culverts, riprnp, etc... o Flow will be in channel bed once the impacts are removed • 1 week to restore stream channels o mimic surrounding pattern, dimension, and profile o including placement of rocks and woody debris • 1 week to restore the stream banks to original condition • 2 weeks to install the vegetation Depending on weather conditions, the restoration work can be completed within one month. Photographs will be taken and forwarded to the Army Corps and NC DWQ offices once all restoration work is completed. Please contact WNR staff to accompany you and to schedule a site inspection if desired. PRESERVATION Preservation nt a ratio of 10:1 and 80:1 will occur for all remaining intermittent and perennial stream impacts, respectively, totaling approximately 23,035 linear feet. These areas will be contained within the "Declaration of Easements, Covenants, Conditions, and Restrictions for the Plot of Round Mountain Falls" to be protected in perpetuity. There are approximately 89,500 linear feet of streams located within the Round Mountain Falls property boundary. Only those areas accounted for in the permit application, totaling 793 linear feet, will be impacted; approximately 88,700 linear feet of stream will remain un-impacted. Lots in Phase 1 have already been sold; therefore, they have not been included within the easement legal description. However; all streams in Phases 1 are required to have a minimum 25-foot trout buffer which has been indicated on all plans. Recommended Native Species for Stream Restoration Trees Yellow Buckeye Sweet Birch River Birch Bitternut Hickory Shagbark Hickory Persimmon Green Ash Carolina Silverbell Blackgum Sycamore Black Cherry Black Willow White Basswood Small Trees and Shrubs Tag Alder Serviceberry Red Chokeberry Common Pawpaw Sweet-shrub Ironwood Alternate Leaf Dogwood Silky Dogwood Hazel-nut Witch Hazel Winter Berry Doghobble Spicebush Male-berry Umbrella Tree Ninebark Wild Azalea Swamp Azalea Swamp Rose Silky Willow Meadowsweet Sweet Leaf W ithe-rod Yellow-root Herbaceous Jack-in-the-Pulpit Swamp Milkweed Fringed Sedge Bladder Sedge Hop Sedge Aesculus octandra Betula lenta Betula nigra Carya cordiformis Carya ovata Diospyros virginiana Fraxinus pennsylvanica Halesia caroliniana Nyssa sylvatica Platanus occidentalis Prunus serotina Salix nigra Tilia heterphylla Alnus serrulata Amelanchier arbrea Aroma arbutifolia Asimina triboba Calycanthus tloridus Carpinus caroliniana Corpus alternifolia Corpus amomum Corylus Americana Hamamelis virginiana Ilex verticillata Leucothoe axillaries Lindera benzoin Lyonia ligustrina Magnolia tripetala Physocarpus opulifolius Rhododendron periclymenoides Rhododendron viscosum Rosa palustris Salix sericea Spirea latifolia Symplocos tinctoria Viburnum cassinoides Xanthorhiza simplicissima Arisaema triphyllum Asc%pias incarnate Carex crinata Carex intumescens Carex lupulina Herbaceous [con't~ Lurid Sedge Carex lurida Broom Sedge Carex scoparia Tussock Sedge Carex stricta Fox Sedge Carex vulpinoides Turtlehead Che%ne g/abra Umbrella Sedge Cyperus strigosus Bottlebrush Grass E/ymus hystrix Joe-Pye Weed Eupatorium fistulosum Boneset Eupatorium pen`oliatum Jewelweed Impatiens capensis Soft Rush Juncus effuses Rice Cutgrass Leersia oryzoides Cardinal Flower Lobe/ia carding/is Great Blue Lobelia Lobe/ia siphi/itica Seedbox Ludwigia a/ternifolia Switchgrass Panicum virgatum Tearthumb Polygonum sagittatum Green Bulrush Scirpus atrovirens Woolgrass Scirpus cyperinus Soft Stem Bulrush Scirpus va/idus Bur-reed Sparganium americanum March Fern Theypteris palustris River Oats Uniola /atifolia Ironweed ~ernonia noveboracensis Potential Sources For Plant Material Herbaceous Material: Niche Gardens I I I I Dawson Road Chapel Hill, NC 275 16 (9 19) 23 I -6161 We-Du Nurseries Rt. 5, Box 724 Marion, NC 28752 (828) 738-8300 Shrub Material: Campbell's Nursery Carlton Campbell 2816 Campbell Road Raleigh, NC 27606 (9 19) 85 I - 1162 Cure Nursery Bill or Jennifer Cure 880 Buteo Road Pittsboro, NC 27312 (919) 542-6186 Fern Valley Farms Tom Clarke 1624 Fern Valley Farm Road Yadkinville, NC 27055 (910) 463-2412 Tree Material: NC Division of Forest Resources Edwards Nursery 701 Sanford Drive Morganton, NC 28655 (828) 438-6270 Tree Shelters: Treessentials Company 2371 Waters Drive Mendota Heights, MN 55120-I 163 800-248-8239 Tire Tree Ties: Grostrait (707) 745-4330 Dimensions Site De th at Thalwe in Water Surface in OHW in Bankfull in) w d w d w d 1 1 25 1 32 4 43 8 2 2 18 2 18 2 40 24 3 1 27 1 37 6 43 10 4 1.25 24 1.25 30.5 4 44 11 5 1.5 20 1.5 24 3 32 5 6 2 36 2 48 6 72 12 7 1 18 1 24 3 36 6 w =width d =depth Site #1 Site # 2 Site #3 Site #4 x y x y x y x y Bkf L 0 8 0 24 0 10 0 11 OHW L 5.5 4 11 2 2 6 6.75 4 WS L 9 1 11 2 8 1 10 1.25 TH 21.5 0 20 0 21.5 0 22 0 WS R 34 1 29 2 35 1 34 1.25 OHW R 37.5 4 29 2 40 6 37.25 4 Bkf R 43 8 40 24 43 10 44 11 Site #5 Site # 6 Site #7 x y x y x y x=Horizontal Position Bkf L 0 5 0 12 0 6 Bkf L=location of ban OHW L 4 3 12 6 6 3 OHW L=location of of WS L 6 1.5 18 2 9 1 WS L=location of wat TH 16 0 36 0 18 0 TH =location of thalwe WS R 26 1.5 54 2 27 1 WS R =location of wa OHW R 28 3 60 6 30 3 OHW R=location of o Bkf R 32 5 72 12 36 6 Bkf R =location of bar SLOPE Site # Distance (If) Height (in) Height (in) ~ H (in) Slope (u stream downstream 1 20 40 50 10 4.2% 2 25 40 93 53 17.7% 3 25 40 53 13 4.3% 4 25 40 43 3 1.0% 5 26 40 61 21 6.7% 6 25 40 49 9 3.0% 7 25 40 48 8 2.7% (in); y =Depth (in) dull on left bank Binary high water on left bank er surface on left bank er surface on right bank rdinary high water on right bank kfull on right bank Stream Cross Section #1 s a s c 5 L 6 d O 4 3 2 1 0 0 Stream Cross Section #2 30 25 20 c t 15 a d O 10 5 0 5 10 15 20 25 30 35 40 45 50 Horizontal Position (in) 5 10 15 20 25 30 35 40 45 Horizontal Position (in) Stream Cross Section #3 1z 10 8 c L 6 d d 4 2 () 0 Stream Cross Section #d 12 t0 8 c L 6 a d 4 2 0 0 5 10 15 20 25 30 35 40 45 50 Horizontal Position (in) 5 10 15 20 25 30 35 40 45 50 Horizontal Position (in) Stream Cross Section #5 s 5 4 c r 3 a d 0 2 1 Stream Cross Section #6 1a 12 10 8 L a m O 6 0 0 0 5 10 15 20 25 30 35 Horizontal Position (in) 10 20 30 40 50 60 70 80 Horizontal Position (in) Stream Cross Section #7 7 6 5 ~., 4 c t n m ~ 3 2 1 0 Reference Reach for #2, 6, 7 7 6 5 ,,., 4 c L c. d ~ 3 2 1 5 10 15 20 25 30 35 40 Horizontal Position (in) 0 0 10 20 30 40 50 60 Horizontal Position (in) Reference Reach for Site #1, 3, 4, 5 c 5 L a d O 4 Horizontal Position (in) 0 10 20 30 40 50 60