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HomeMy WebLinkAbout20181463 Ver 1_401 Application_201810261 T.E. ALLEN ENGINEERING, PC TERRY E. ALLEN, PE, MSE CONSULTING ENGINEER Post Office Box 103 Rosman, North Carolina 28772 Phone (828) 877-4883 Email: tealleneng@comporium.net Mobile (828) 553-3004 Firm # C-1997 October 18, 2018 SUBJECT: Pre -Construction Notification (PCN) Application Form for 401/404 Permits for New Boulder Seawall and Sediment Removal at Greg Holcomb Residence, 338 Cardinal Drive West, Lake Toxaway, Transylvania County, North Carolina, PIN: 8513- 52-2554-000 & 8513-52-3432-000, Property Owner of Record - Gimmelwald LLC, 208 S Lasalle St. Ste 1650, Chicago IL 60604 PAID NC DWQ, 401/Wetlands Unit 1650 Mail Service Center Raleigh, NC 27699-1650 Dear DWQ: 20181463 Enclosed, please find five (5) copies of the 401/404 application (PCN form). A check for the application review fee is also enclosed. This PCN to address the construction of a new granite boulder Seawall, sedimental removal, and light residential bridge & replacement of an existing Boathouse & Seawall at Greg Holcomb Residence, 338 Cardinal Drive West, Lake Toxaway, Transylvania County, North Carolina. The work shall be in accordance with attached Sheets C-1 through C-5. Lake Toxaway has a water quality classification of B; Tr. The Trout Buffer disturbance is not expected to exceed 10 percent of the stream and lake frontage. All disturbed areas not to be filled or flooded will be vegetated pursuant to the seeding schedule in the Erosion and Sediment Control Planning and Design Manual. If you have any questions or require any additional information, please do not hesitate to contact me at (828) 877-4883 or email tealleneng@comporium.net. Sincerely, Terry . Allen, P.E. Consulting Engineer Enclosures 5 copies of 401/404 PCN Application Form Check for application review fee Copy Furnish w/ attachment: 401 PERMITTING Mr. Kevin Mitchell NCDEQ — Division of Water Resources 2090 U.S. Hwy. 70 Swannanoa, NC 28711 828-296-4500 NC FISH & WILDLIFE PERMITTING Andrea Leslie Mountain Habitat Conservation Coordinator NC Wildlife Resources Commission 645 Fish Hatchery Rd., Bldg B Marion, NC 28752 828-400-4223 andrea.leslie@ncwildlife.org USACE 404 PERMITTING Mr. David Brown, PG Asheville Regulatory Field Office US Army Corps of Engineers 151 Patton Ave, Room 208 Asheville, NC 28801-5006 Office Use Only: Corps action ID no. DWQ project no. Form Version 1.3 Dec 10 2008 Pre -Construction Notification PC Form A. Applicant Information 1. Processing 1 a. Type(s) of approval sought from the Corps: ®Section 404 Permit ❑Section 10 Permit 1 b. Specify Nationwide Permit (NWP) number: 13 - New Seawall & 18 - Sediment Removal or General Permit (GP) number: 1 c. Has the NWP or GP number been verified by the Corps? ® Yes ❑ No 1 d. Type(s) of approval sought from the DWQ (check all that apply): ® 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit ❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization 1 e. Is this notification solely for the record because written approval is not required? For the record only for DWQ 401 Certification: ❑ Yes ® No For the record only for Corps Permit: ❑ Yes ® No 1f. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts? If so, attach the acceptance letter from mitigation bank or in -lieu fee program. ❑ Yes ® No 1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h below. ❑ Yes ® No 1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ❑ Yes ® No 2. Project Information 2a. Name of project: New Boulder Retaining Wall (Seawall) & Sediment Removal 2b. County: Transylvania 2c. Nearest municipality / town: Brevard 2d. Subdivision name: Lake Toxaway Estates 2e. NCDOT only, T.I.P. or state project no: Page 1 of 12 PCN Form — Version 1.3 December 10, 2008 Version 3. Owner Information 3a. Name(s) on Recorded Deed: Cyndi P. Trostin, Trustee 3b. Deed Book and Page No. PIN: 8513-52-3863-000; Date: 02/2015 Book: 00716 Page: 0161 Plat Book: F16 Page: 320 PIN: 8513-52-1627-000; Date: 02/2015 Book: 00716 Page: 0168 Plat Book: F16 Page: 320 3c. Responsible Party (for LLC if applicable): 3d. Street address: 338 Cardinal Drive West 3e. City, state, zip: Lake Toxaway, NC 28747 3f. Telephone no.: 954-547-2905 (Greg Holcomb) 3g. Fax no.: 3h. Email address: 4. Applicant Information (if different from owner) 4a. Applicant is: ❑ Agent ❑ Other, specify: 4b. Name: 4c. Business name (if applicable): 4d. Street address: 4e. City, state, zip: 4f. Telephone no.: 4g. Fax no.: 4h. Email address: 5. Agent/Consultant Information (if applicable) 5a. Name: Terry Allen, PE 5b. Business name (if applicable): T.E. ALLEN ENGINEERING, PC 5c. Street address: P.O. Box 103 5d. City, state, zip: Rosman, NC 28772 5e. Telephone no.: 828-877-4883 5f. Fax no.: 5g. Email address: tealleneng@comporium.net Page 2 of 12 PCN Form — Version 1.3 December 10, 2008 Version B. Project Information and Prior Project History 1. Property Identification 1a. Property identification no. (tax PIN or parcel ID): PIN: 8513-52-3863-000 and 8513-52-1627-000 1 b. Site coordinates (in decimal degrees): Latitude: 35.148998 Longitude: - 82.96413 (DD.DDDDDD) (-DD.DDDDDD) 1 c. Property size: PIN: 8513-52-3863-000; 1.39 acres PIN: 8513-52-1627-000; 0.95 acres 2. Surface Waters 2a. Name of nearest body of water (stream, river, etc.) to proposed project: Lake Cardinal 2b. Water Quality Classification of nearest receiving water: B, Trout 2c. River basin: Savannah Page 3 of 12 PCN Form —Version 1.3 December 10, 2008 Version 3. Project Description 3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this application: This home site located in Toxaway Estates, a private residential development in western Transylvania County, NC. The lot borders Lake Cardinal which has a classification of B: Trout. The general land use is residential. 3b. List the total estimated acreage of all existing wetlands on the property: none 3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: none 3d. Explain the purpose of the proposed project: Furnish and install 235 LF of new Boulder Retaining Wall (Seawall) for shoreline stabilization. Perform incidental dredging to remove accumulated sediment. Estimated incidental dredging to remove approximately 25 cubic yards of accumulated sediment. No dredging to be performed below the elevation of the natural lake bottom or the natural strsam bottom. 3e. Describe the overall project in detail, including the type of equipment to be used: NEW WORK 1. Furnish and install 235 LF of new Boulder Retaining Wall (Seawall) at the locations shown on attached Sheets C-2 & C-3. All Boulder Retaining Wall (Seawall) work will be performed "IN THE DRY" using a coffer dam to isolate the work area. All pump -out water and site drainage shall compliance with Water Quality Standards. Where a coffer dam is used, the work area will be dewatered by pumping. All dewatering discharge shall have a turbidity of not more than 10 NTUs above background or as otherwise specified in DWQ's Turbidity Standards (15A NCAC 02B.0211(3.)(k.)). To satisfy the required turbidity limit, the dewatering pump discharge shall be filtered through a Bag Filtration Unit equal to Model BF - 400 from Rain -for -Rent, or equal, with a 100 to 1 micron nominal rating. The turbidity level of all discharge shall be monitored with calibrated turbidity meters and the filtration equipment shall be adjusted as necessary to insure compliance with Water Quality Standards. The water around the dredging areas shall likewise be monitored with calibrated turbidity meters and the turbidity curtains shall be adjusted as necessary to insure compliance with Water Quality Standards. Uncured concrete shall not be allowed to come into direct contact with surface waters. This will be accomplished by establishing a "dry work area" as described above. "High Early" cementious material shall be in the stone work to minimize curing time. The existing creek shall be "PIPED AROUND" where necessary. 2. Perform incidental Dredging to remove 25 +/- cubic yards of sediment at locations shown on attached Sheet C-2 & C - Dredge spoils to be disposed of in an uplands disposal pit with no stormwater outlet(s). All drainage to be contained within pit. Disposal Pit shall be excavated and graded to contain all drainage and stormwater within pit, with not discharge. Location and permitting (where required) of Dredge Spoil disposal Pit to be by others. Work to be performed using hand labor & small equipment. At the Contractor's option, the dredging may be performed "IN THE WET" with turbidity control measures (turbidity curtins), or "IN THE DRY" within the limits of the coffer. Only minimual incidental fall back shall be allowed during dredging "IN THE WET". Upland disposal site with no return water and no loss of wetlands. The water around the dredging areas shall be monitored with calibrated turbidity meters. The turbidity curtains shall be adjusted as necessary to insure compliance with Water Quality Standards. 3. See attacheed Sheets C-1, C-2, C-3, C-4, and C-5. Page 4 of 12 PCN Form — Version 1.3 December 10, 2008 Version 4. Jurisdictional Determinations 4a. Have jurisdictional wetland or stream determinations by the Corps or State been requested or obtained for this property / project (including all prior phases) in the past? Comments: ❑ Yes ® No ❑ Unknown 4b. If the Corps made the jurisdictional determination, what type of determination was made? El Preliminary El Final 4c. If yes, who delineated the jurisdictional areas? Name (if known): Agency/Consultant Company: Other: 4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation. 5. Project History 5a. Have permits or certifications been requested or obtained for this project (including all prior phases) in the past? ❑ Yes ® No ❑ Unknown 5b. If yes, explain in detail according to "help file" instructions. 6. Future Project Plans 6a. Is this a phased project? ❑ Yes ® No 6b. If yes, explain. Page 5 of 12 PCN Form — Version 1.3 December 10, 2008 Version C. Proposed Impacts Inventory 1. Impacts Summary 1 a. Which sections were completed below for your project (check all that apply): ❑ Wetlands ❑ Streams - tributaries ❑ Buffers ® Open Waters ❑ Pond Construction 2. Wetland Impacts If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted. 2a. 2b. 2c. 2d. 2e. 2f. Wetland impact Type of jurisdiction number — Type of impact Type of wetland Forested (Corps - 404, 10 Area of impact Permanent (P) or (if known) DWQ — non -404, other) (acres) Temporary T ❑ Yes ❑ Corps W1 ❑ P ❑ T ❑ No ❑ DWQ ❑ Yes ❑ Corps W2 ❑ P ❑ T ❑ No ❑ DWQ ❑ Yes ❑ Corps W3 ❑ P ❑ T ❑ No ❑ DWQ ❑ Yes ❑ Corps W4 ❑ P ❑ T ❑ No ❑ DWQ ❑ Yes ❑ Corps W5 ❑ P ❑ T ❑ No ❑ DWQ ❑ Yes ❑ Corps W6 ❑ P ❑ T ❑ No ❑ DWQ 2g. Total wetland impacts 2h. Comments: 3. Stream Impacts If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this question for all stream sites impacted. 3a. 3b. 3c. 3d. 3e. 3f. 3g• Stream impact Type of impact Stream name Perennial Type of jurisdiction Average Impact number - (PER) or (Corps - 404, 10 stream length Permanent (P) or intermittent DWQ — non -404, width (linear feet) Temporary (T) (INT)? other) (feet) S1 ❑ P ®T Temporary Pipe Unnamed Trib to ® PER ® Corps 3 140 Around 100 LF Lake Cardinal ❑ INT ❑ DWQ ❑ PER ❑ Corps S2 ❑ P ❑ T ❑ INT ❑ DWQ ❑ PER ❑ Corps S3 ❑ P ❑ T ❑ INT ❑ DWQ ❑ PER ❑ Corps S4 ❑ P ❑ T ❑ INT ❑ DWQ ❑ PER ❑ Corps S5 ❑ P ❑ T ❑ INT ❑ DWQ ❑ PER ❑ Corps S6 ❑ P ❑ T ❑ INT ❑ DWQ 3h. Total stream and tributary impacts 140 3i. Comments: This is a temporary impact to pipe the unnamed tributary around the work area. Contractor shall size the pipe to carry the stream flow and runoff from the 25 -Yr / 24 Hr storm. Page 6of12 PCN Form — Version 1.3 December 10, 2008 Version 4. Open Water Impacts If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of the U.S. then individually list all open water impacts below. 4a. 4b. 4c. 4d. 4e. Open water Name of waterbody impact number — (if applicable) Type of impact Waterbody type Area of impact (acres) Permanent (P) or Temporary T 01 ❑ P ®T Lake Cardinal 25 CY of Dredging/ Sediment Lake 0.01 Acres Removal 02 ❑ P ®T Lake Cardinal Temporary Co3ff r Dam (100 Ft x Lake 0.01 Acres 03 ®P ❑ T Lake Cardinal Boulder Retaining Wall (Seawall) Lake 0.04 Acres (235'x8') 04 ❑ PEI T 4f. Total open water impacts 0.06 Acres 4g. Comments: At the Contractor's option, the dredging may be performed "IN THE WET" with turbidity control measures (turbidity curtins), or "IN THE DRY" within the limits of the coffer dam. Only minimual incidental fall back shall be allowed during dredging "IN THE WET". Upland disposal site with no return water and no loss of wetlands. The water around the dredging areas shall be monitored with calibrated turbidity meters. The turbidity curtains shall be adjusted as necessary to insure compliance with Water Quality Standards. Dredging with small excavator with minimual incidental fall back. Turbidity curtains will be used to isolate the work areas and curtains will remain in place until the turbidity in the work area is less than 10 NTUs above background. Upland disposal site with have no return water and no wetlands will be impacted. Seawall work will be accomplished "in the dry" by installing a temporary coffer dam around the proposed work area. The dewatering discharge will be filtered to DWQ Water Quality Standards prior to release. S. Pond or Lake Construction If pond or lake construction proposed, then complete the chart below. 5a. 5b. 5c. 5d. 5e. Wetland Impacts (acres) Stream Impacts (feet) Upland Pond ID Proposed use or purpose (acres) Flooded Filled Excavated Flooded Filled Excavated Flooded number of pond P1 P2 5f. Total 5g. Comments: 5h. Is a dam high hazard permit required? ❑ Yes ❑ No If yes, permit ID no: 5i. Expected pond surface area (acres): 5j. Size of pond watershed (acres): 5k. Method of construction: Page 7of12 PCN Form — Version 1.3 December 10, 2008 Version 6. Buffer Impacts (for DWQ) If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts below. If any impacts require mitigation, then you MUST fill out Section D of this form. 6a. ❑ Neuse El Tar -Pamlico El Other: Project is in which protected basin? ❑ Catawba ❑ Randleman 6b. 6c. 6d. 6e. 6f. 6g. Buffer impact number — Reason Buffer Zone 1 impact Zone 2 impact Permanent (P) or for Stream name mitigation (square feet) (square feet) Temporary T impact required. 131 ❑P❑T ❑Yes ❑ No B2 ❑ P ❑ T ❑ Yes ❑ No B3 ❑P❑T El Yes ❑ No 6h. Total buffer impacts 6i. Comments: D. Impact Justification and Mitigation 1. Avoidance and Minimization 1 a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project. At the Contractor's option, the dredging may be performed "IN THE WET" with turbidity control measures (turbidity curtins), or "IN THE DRY" within the limits of the coffer dam. Only minimual incidental fall back shall be allowed during dredging "IN THE WET". Upland disposal site with no return water and no loss of wetlands. The water around the dredging areas shall be monitored with calibrated turbidity meters. The turbidity curtains shall be adjusted as necessary to insure compliance with Water Quality Standards. Dredging with small excavator with minimual incidental fall back. Turbidity curtains will be used to isolate the work areas and curtains will remain in place until the turbidity in the work area is less than 10 NTUs above background. Upland disposal site with have no return water and no wetlands will be impacted. Seawall work will be accomplished "in the dry" by installing a temporary coffer dam around the proposed work area. The dewatering discharge will be filtered to DWQ Water Quality Standards prior to release. The Seawall construction is the minimual necessary for bank stabilization. A dry work area will be created to comply with Water Quality Standards. 1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques. To minimize disturbance during construction, the work will be accomplished with the smallest mechanical equipment practicable. Turbidity curtains will be used around the dredging areas. The upland disposal areas for the dredge spoils will have no return water and there will be no wetlands impacted. Seawall work will be accomplished "in the dry" by installing a temporary coffer dam around the proposed work area. The dewatering discharge will be filtered to DWQ Water Quality Standards prior to release. 2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State 2a. Does the project require Compensatory Mitigation for ❑ Yes ® No impacts to Waters of the U.S. or Waters of the State? 2b. If yes, mitigation is required by (check all that apply): ❑ DWQ ❑ Corps ❑ Mitigation bank 2c. If yes, which mitigation option will be used for this El Payment to in -lieu fee program project? ❑ Permittee Responsible Mitigation Page 8 of 12 PCN Form — Version 1.3 December 10, 2008 Version 3. Complete if Using a Mitigation Bank 3a. Name of Mitigation Bank: 3b. Credits Purchased (attach receipt and letter) Type Quantity 3c. Comments: 4. Complete if Making a Payment to In -lieu Fee Program 4a. Approval letter from in -lieu fee program is attached. ❑ Yes 4b. Stream mitigation requested: linear feet 4c. If using stream mitigation, stream temperature: ❑ warm ❑ cool ❑cold 4d. Buffer mitigation requested (DWQ only): square feet 4e. Riparian wetland mitigation requested: acres 4f. Non -riparian wetland mitigation requested: acres 4g. Coastal (tidal) wetland mitigation requested: acres 4h. Comments: S. Complete if Using a Permittee Responsible Mitigation Plan 5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan. 6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ 6a. Will the project result in an impact within a protected riparian buffer that requires buffer mitigation? ❑ Yes ❑ No 6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the amount of mitigation required. Zone 6c. Reason for impact 6d. Total impact (square feet) Multiplier 6e. Required mitigation (square feet) Zone 1 3 (2 for Catawba) Zone 2 1.5 6f. Total buffer mitigation required: 6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank, permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund). 6h. Comments: All trout buffer disturbance that may occur as a result of installing the new Boulder Retaining Wall (Seawall) shall be repaired. Trout Buffer Restoration shall be in accordance with the NCDEQ-DLR Trout Buffer and Riparian Area planting requirements. Should project exceed 10% or 100' in 1000', a trout buffer waiver will be sought from NCDENR - Div of Land Resources Page 9 of 12 PCN Form —Version 1.3 December 10, 2008 Version E. Stormwater Management and Diffuse Flow Plan (required by DWQ) 1. Diffuse Flow Plan 1a. Does the project include or is it adjacent to protected riparian buffers identified ❑ Yes ® No within one of the NC Riparian Buffer Protection Rules? 1 b. If yes, then is a diffuse flow plan included? If no, explain why. ❑ Yes ❑ No Comments: 2. Stormwater Management Plan 2a. What is the overall percent imperviousness of this project? % 2b. Does this project require a Stormwater Management Plan? ❑ Yes ® No 2c. If this project DOES NOT require a Stormwater Management Plan, explain why: 2d. If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan: ❑ Certified Local Government 2e. Who will be responsible for the review of the Stormwater Management Plan? ❑ DWQ Stormwater Program ❑ DWQ 401 Unit 3. Certified Local Government Stormwater Review 3a. In which local government's jurisdiction is this project? ❑ Phase II 3b. Which of the following locally -implemented stormwater management programs ❑ NSW ❑ USMP apply (check all that apply): ❑ Water Supply Watershed ❑ Other: 3c. Has the approved Stormwater Management Plan with proof of approval been ❑ Yes ❑ No attached? 4. DWQ Stormwater Program Review ❑ Coastal counties ❑ HQW 4a. Which of the following state -implemented stormwater management programs apply ❑ ORW (check all that apply): ❑ Session Law 2006-246 ❑ Other: 4b. Has the approved Stormwater Management Plan with proof of approval been ❑ Yes ❑ No attached? S. DWQ 401 Unit Stormwater Review 5a. Does the Stormwater Management Plan meet the appropriate requirements? ❑ Yes ❑ No 5b. Have all of the 401 Unit submittal requirements been met? ❑ Yes ❑ No Page 10 of 12 PCN Form — Version 1.3 December 10, 2008 Version F. Supplementary Information 1. Environmental Documentation (DWQ Requirement) 1 a. Does the project involve an expenditure of public (federal/state/local) funds or the ❑ Yes ® No use of public (federal/state) land? 1 b. If you answered "yes" to the above, does the project require preparation of an environmental document pursuant to the requirements of the National or State ❑ Yes ❑ No (North Carolina) Environmental Policy Act (NEPA/SEPA)? 1 c. If you answered "yes" to the above, has the document review been finalized by the State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval ❑ Yes ❑ No letter.) Comments: 2. Violations (DWQ Requirement) 2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ❑ Yes ® No or Riparian Buffer Rules (15A NCAC 2B .0200)? 2b. Is this an after -the -fact permit application? ❑ Yes ® No 2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s): 3. Cumulative Impacts (DWQ Requirement) 3a. Will this project (based on past and reasonably anticipated future impacts) result in ❑ Yes ® No additional development, which could impact nearby downstream water quality? 3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the most recent DWQ policy. If you answered "no," provide a short narrative description. 4. Sewage Disposal (DWQ Requirement) 4a. Clearly detail the ultimate treatment methods and disposition (non -discharge or discharge) of wastewater generated from the proposed project, or available capacity of the subject facility. N.A. Page 11 of 12 PCN Form — Version 1.3 December 10, 2008 Version 5. Endangered Species and Designated Critical Habitat (Corps Requirement) 5a. Will this project occur in or near an area with federally protected species or ❑ Yes ® No habitat? 5b. Have you checked with the USFWS concerning Endangered Species Act 0 Yes ® No impacts? ❑ Raleigh 5c. If yes, indicate the USFWS Field Office you have contacted. ❑ Asheville 5d. What data sources did you use to determine whether your site would Impact Endangered Species or Designated Critical Habitat? 6. Essential Fish Habitat (Corps Requirement) 6a. Will this project occur in or near an area designated as essential fish habitat? ❑ Yes ® No 6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat? 7. Historic or Prehistoric Cultural Resources (Corps Requirement) 7a. Will this project occur in or near an area that the state, federal or tribal governments have designated as having historic or cultural preservation ❑ Yes ® No status (e.g., National Historic Trust designation or properties significant in North Carolina history and archaeology)? 7b. What data sources did you use to determine whether your site would impact historic or archeological resources? 8. Flood Zone Designation (Corps Requirement) 8a. Will this project occur in a FEMA-designated 100-year floodplain? ❑ Yes ❑ No 8b. If yes, explain how project meets FEMA requirements: 8c. What source(s) did you use to make the floodplain determination? Cyndi P. Trostin, Trustee Applicant/Agent's Printed Name Applic r�t�Agent's Signature (Agent's signature s valid an) it an authorization letter from the applicant Date Page 12 of 12 PCN Form — Version 1.3 December 10, 2008 Version HEM SEAMALL o SEDOM ENE REMOVAL VAL s� GREQ HOLCOM p RENDEHC E Property Owner of Record: Trostin, Cyndi P Trustee 338 Cardinal Drive West, B M L036 Cardinal Dr., Lake Toxaway, NC 208 S LaSalle St Ste 1650 Chicago, IL 60604 1.0 This Project is for sediment removal, construction on a new boulder seawall, and construction of an 8'x20' Bridge over the existing unnamed tributary to Lake Toxaway. Ne Bridge shall be designed by thers. Comply with the latest edition of the Lake Toxaway Community Association Architectural Review Standards and NC Building Code Requirements. The existing property lines and the Side Yard Setback shall be located, marked and flagged by a Professional Land Surveyor prior to beginning work. Verify actual setback requirement with the most current Lake Toxaway Community Association Architectural Review Standards 2.0 As a result of the site investigation, a number of observations have been made and recommendations provided. It should be noted that the observations and conclusions stated herein are based on information available as of this writing. It is conceivable that additional information may be forthcoming which bears on these observations, conclusions and the overall design. The right is reserved, therefore, to review and modify all observations, conclusions, and design features at any future point in time should, in fact, additional information become available. The comments, recommendations, and design features provided herein are applicable only to the new Boathouse. 3.0 All work shall be in accordance with North Carolina State Building Code, OSHA Safety and Health Requirements, US Army Corps of Engineers 404 permit requirements, NCDEQ Division of Water Quality 401 permit requirements, NC Sedimentation Pollution Control Act, and all other applicable codes, ordinances, and regulations. The Contractor shall coordinate all work with the Lake Toxaway Operations Manager, 16801 Rosman Hwy, Lake Toxaway, NC 28747. 4.0 PERMITS. The Owner and/or Contractor shall obtain all required permits, rights—of—entry & authorization Lake Toxaway Community Association prior to beginning work. Locate, flag and protect all underground utilities. Do not locate any portion of the work within and easement, set—back, or R/W. 5.0 All construction materials and debris shall be removed from the site upon completion of the project and the area shall be graded such that all surfaces drain naturally, blend with the natural terrain, and are left in a condition that facilitate sown ground covers and natural revegetation. 6.0 The Contractor's activities shall be performed by methods that will prevent entrance, or accidental spillage, of solid matter, contaminants, debris, or other pollutants and wastes into streams, flowing or dry watercourses, lakes or underground water sources. 7.0 Runoff and discharge shall be monitored to insure that no sediment is discharged to the downstream watercourse. 8.0 TURBIDITY CONTROL. The Contractor shall not violated water quality stream standards during the performance of this work. The Turbidity Level in the lake waters shall not exceed 10 NTUs at any time during performance of this work pursuant to 15A NCAC 02B.0211 (3)(k). The Contractor shall employ any and all methods necessary to prevent a violation of the Turbidity Standards. These measures include, but are not limited to; turbidity curtains around the work, haybails, silt fence, stone check dams, etc. Where turbidity curtain are necessary, curtains shall remain in place until the turbidity in the work areas return to original background levels. 9.0 All other work that may be required, but not shown herein, shall be designed by the Contractor. 10.0 Limitation of Liability. By accepting this engineering document, the Owner, Contractor and any others to whom it is distributed, agree to a strict limitation of liability for Terry E. Allen PE, T.E. ALLEN ENGINEERING, P.C., and its employees to an amount not to exceed $25,000.00 or one—half the total amount of paid invoices, whichever is less. PRELIMINARY — NOT FOR CONSTRUCTION r` �00 N E O > C) v oZLo o -6 N0) �E6N� 0 0 C: 3 —.2 :6 r,E v°o0�0 N2U�--Lo 0 0 0100 Y t PO 0 1n E C7nJ0) a) o_ 3CZ� 06 X U O QQca��o <> ro r) cWnw�00 a Z �p'� N C)Z�00CO �LJ U x L M 00 CZ C j, a Z U � CY)� 1 06-05-2015 1 C-1 © Copyright 2018 T.E. ALLEN ENGINEERING PC. All Rights Reserved Worldwide. DO NOT SCALE DRAWINGS SHEET I OF 5 roperTy owner or Kecora: Trostin, Cyndi P Trustee N NEW Boulder Retaining Wall (Seawall). 75—Ft 208 S LaSalle St Ste 1650 (+/—). Height of Seawall varies. Field adjust Chicago, IL 60604 W-11111 ® 0—E Wall Height to fit existing rade and contour. � � �i uW.SW ruaY uo PARTMMSW lAT g of 8 37 '42 P"° SW -62-3W g Accumulated Sediment to be removed ' 578.96' N0°`N°1MQ1°o^0 R by Shovel & Bucket only. 25 CY W J ..... max. Q LOT 36 20'x8'Bridge Over Creek. Bridge shall in accordance with Section R327 of the 2018 NC Residentiall Building Code, and X���Chapter 36 of the 2018 NC Buildinq Code. NEW Boulder Retaining Wall (Seawall). Height of Seawall varies. Field adjust LOT as "'"' Wall Height to fit existing grade and ...� ..................... contour. LAKE CARDINAL (WATER UNE IS PROPERTY UNE PER PLAT) LOT 34WR Property Owner may field adjust length and alignment of Seawalls for best fit. LOT aa -R The total length of Seawall shall not Ole' exceed 235 LF. 89� NOTES. 1.0 RESTORE TROUT BUFFER. All trout buffer disturbance that may occur as a result of installing the new Boulder Retaining Wall (Seawall) shall be repaired. Trout Buffer Restoration shall be in accordance with the NCDEQ—DLR Trout Buffer and Riparian Area planting requirements. All existing structures to remain. a arl� survey data shown 3.0 The bound on this sheet was provided by MICHAEL A. PFOUTZ Sr., PROFESSIONAL LAND SURVEYOR, CAROLINA MOUNTAIN SURVEYING, Brevard, NC This sheet shall not be considered a Land S u rvey. 2.0 All other work that may be required, but not shown herein, shall be designed by the Contractor. By accepting this engineering document, the Owner, Contractor and any others to whom it is distributed, agree to a strict limitation of liability for Terry E. Allen PE, T.E. ALLEN ENGINEERING, P.C., and its employees to an amount not to exceed $25,000.00 or one—half the total amount of paid invoices, whichever is less. OVERALL SITE PLAN — SHORELINE STABILIZATION NOT TO SCALE DO NOT SCALE DRAWINGS 2018 T.E. ALLEN ENGINEERING PC. All Rights Reserved Worldwide. PRELIMINARY — NOT FOR CONSTRUCTION U F N C z � � Z of 8 M Z ao W c W R Z W J Q U E W� 3= 06 ro o X -a u U p QQ c o 3>7) M�CY) Z. 60 Q z 0 0 (y)0 .aW o ?ULo C = 00 � Q 041 Z U c M 3V)ic�b;a z u" DD 4 I 09-24-2018 I C-2 SHEET 2 OF 5 Property Owner of Record: Trostin, Cyndi P Trustee 208 S LaSalle St Ste 1650 Chicaqo, IL 60604 FIP NEW Boulder Retaining Wall (Seawall). 75 LF Max. Height of Seawall varies. Field adjust Wall Height to fit existing grade and contour ccumulated Sediment to be removed y Shovel & Bucket only. 25 CY ax. 20x8" Bridge Over Creek. Bridge shall be in accordance with Section R327 of the 2018 NC Residential Building Code, and Chapter 36 of the 2018 NC Building Code. Bridge shall clear—span over channel. Bridge structure shall be elevated 2—Ft above the BFE. All Bridge Structure shall meet the flood resistant construction requirements of the 2018 NC BuildingCode. Lsta MBER STRUCTURES. wood pilin e i Ings shall have water immersion treatment per NC Building Code. All posts shall be driven or auger embedded into the lake bottom without concrete fill. Embedment depth shall be 8—Ft min or as necessary to develop the required skin friction and point bearing load—bearing structure above. BOULDER RETAINING WALL (SEAWALL) & SEDIMENT REMOVAL PLAN NOT TO SCALE NOTES. 1.0 Property Owner may field adjust length and alignment of Seawalls segments for best fit. The total ro length of all Seawalls shall not 3 N E exceed 235 LF.o > V U 2.0 RESTORE TROUT BUFFER. All o Z LO 'o trout buffer disturbance that may L o o N 3 occur as a result of installing the —0-02--s o new Boulder Retaining Wall (Seawall) r o = shall be repaired. Trout Buffer W v F°— L a Restoration shall be in accordance o � t s the with NCDEO—DLR Trout Buffer Wa7 a) L ro o Lo E and Riparian Area planting a 0 n J a' 0' requirements. All existing structures to remain. 3.0 All other work that may be required, but not shown herein, shall be designed by the Contractor. By accepting this engineering document, the Owner, Contractor and any others to whom it is distributed, agree to a strict limitation of liability for Terry E. Allen PE, T.E. ALLEN ENGINEERING, P.C., and its employees to an amount not to exceed $25,000.00 or one—half the total amount of paid invoices, whichever is less. 4.0 The boundary and survey data shown on this sheet was provided by MICHAEL A. PFOUTZ Sr., PROFESSIONAL LAND SURVEYOR, CAROLINA MOUNTAIN SURVEYING, Brevard, NC. This sheet shall not be considered a Land Survey. 5.0 See Boulder Retaining Wall (Seawall) Detail and Notes on Sheets C-4 & C-5 for additional requirements. PRELIMINARY — NOT FOR CONSTRUCTION U � CL Z ci M � E �n o 1? & ao _J m - J o Q V u 3= X O O u E~ ( j o 0 o O E C Lo o> U o �D oo be Z m C UM � � I 09-24-2018 1 C-3 DO NOT SCALE DRAWINGS © Copyright 2018 T.E. ALLEN ENGINEERING PC. All Rights Reserved Worldwide. SHEET 3 of 5 NEW BOULDER RETAINING WALL (SEAWALL) EXTEND GEOTEXTILE FABRIC ANCHOR TIE—BACK TO FRONT FACE OF BOULDER WALL. BOULDER WALL TO TILT 5—DEGREES OR MORE FROM HORIZONTAL. --- v1 BOULDER e BK okko BOULDER Satisfactory & stable insitu earth— with 3500 PSF bearing capacity or 18" Thick compacted stone aggregate footer (NCDOT Type ABC Stone), w/ Mirafi 50OX lining. RETAIN EXPOSED FACE OF FILL WITH NON—WOVEN NEEDLE PUNCHED GEOTEXT1LE FABRIC BETWEEN SOIL ANCHOR FABRIC CHIMNEY DRAIN, 1—FT HORIZONTAL THICKNESS, WRAPPED IN NON—WOVEN NEEDLE PUNCHED GEOTEXTILE FABRIC, SEE BOULDER WALL NOTE 12. SELECT ENGINEERED FILL ABOVE NORMAL POOL ELEV., PLACED IN 6—INCH THICK HORIZONTAL LIFTS AND COMPACTED TO 98% OF THE MATERIALS MAX DRY DENSITY ___7 1 See Boulder Wall Note 3 See Boulder Wall Note 3 GEOTEX11LE FABRIC ANCHOR Existing Undistu Residuum Boulder Wall Note BLANKET DRAIN, BACKFILL BELOW NORMAL— POOL ELEVATION W/ #54 CLEAN WASHED STONE WRAPPED IN NON—WOVEN NEEDLE PUNCHED GEOTEXTILE FABRIC, SEE BOULDER WALL NOTE 13. BOULDER RETAINING WALL (SEAWALL) DETAIL NOT TO SCALE Existing Undisturbed Residuum SELECT ENGINEERED FILL ABOVE NORMAL POOL ELEV. #57 CLEAN STONE FILL BELOW NORMAL POOL ELEV. GEOTEXTILE FABRIC ANCHOR. TYPICAL EACH BOULDER COURSE. SEE BOULDER WALL NOTE 6. TIE—BACK LENGTH SHALL BE 3 X WALL HT. NON—WOVEN NEEDLE PUNCHED GEOTEXTILE FABRIC PRELIMINARY — NOT FOR CONSTRUCTION r` 3,00 N E 0 > U a `Z Lo _�OE LE000) 0 0 C 3 Cq 2 i5 -p 0 0 0 � a to 0 Ll � 00 N L M In E C� M J a) On U BOULDER (2) 6" HDPE PERFORATED DRAIN PIPES, ROUTED TO BOULDER xa DAYLIGHT AND SLOPED TO DRAIN. 5' PROVIDE RODENT SCREEN AT END. I 1/4 BOULDER 00 j Vi LAKE LEVEL BOULDER ER Q Normal Pool Elev. > (3010 +/—) H = BOULDER RIPRAP Toe Apron to J i Q provide compensatory 3 habitat. NCDOT Class 2 Riprap. BOULDER v1 BOULDER e BK okko BOULDER Satisfactory & stable insitu earth— with 3500 PSF bearing capacity or 18" Thick compacted stone aggregate footer (NCDOT Type ABC Stone), w/ Mirafi 50OX lining. RETAIN EXPOSED FACE OF FILL WITH NON—WOVEN NEEDLE PUNCHED GEOTEXT1LE FABRIC BETWEEN SOIL ANCHOR FABRIC CHIMNEY DRAIN, 1—FT HORIZONTAL THICKNESS, WRAPPED IN NON—WOVEN NEEDLE PUNCHED GEOTEXTILE FABRIC, SEE BOULDER WALL NOTE 12. SELECT ENGINEERED FILL ABOVE NORMAL POOL ELEV., PLACED IN 6—INCH THICK HORIZONTAL LIFTS AND COMPACTED TO 98% OF THE MATERIALS MAX DRY DENSITY ___7 1 See Boulder Wall Note 3 See Boulder Wall Note 3 GEOTEX11LE FABRIC ANCHOR Existing Undistu Residuum Boulder Wall Note BLANKET DRAIN, BACKFILL BELOW NORMAL— POOL ELEVATION W/ #54 CLEAN WASHED STONE WRAPPED IN NON—WOVEN NEEDLE PUNCHED GEOTEXTILE FABRIC, SEE BOULDER WALL NOTE 13. BOULDER RETAINING WALL (SEAWALL) DETAIL NOT TO SCALE Existing Undisturbed Residuum SELECT ENGINEERED FILL ABOVE NORMAL POOL ELEV. #57 CLEAN STONE FILL BELOW NORMAL POOL ELEV. GEOTEXTILE FABRIC ANCHOR. TYPICAL EACH BOULDER COURSE. SEE BOULDER WALL NOTE 6. TIE—BACK LENGTH SHALL BE 3 X WALL HT. NON—WOVEN NEEDLE PUNCHED GEOTEXTILE FABRIC PRELIMINARY — NOT FOR CONSTRUCTION r` 3,00 N E 0 > U a `Z Lo _�OE LE000) 0 0 C 3 Cq 2 i5 -p 0 0 0 � a to 0 Ll � 00 N L M In E C� M J a) On U � N � C9 z W i ogz W g R NN z �$ w -- o _j J � — Qv w aro � X O 0 3� UF-Uo C7 Q b co zoc �zco Lo E 3 w¢ 0U 0 R: > U — o Lo 00 ww cz Cam Ty > CL O co L pp U ro � � i 09-24-2o,e i DO NOT SCALE DRAWINGS C Copyright 2018 T.E. ALLEN ENGINEERING PC. All Rights Reserved Worldwide. C-4 9 SHEET 4 OF 5 BOULDER REARM MALL QSEAMALQ MOTES BOULDER WALL NOTES: 1. These Notes apply to the Boulder Retaining Wall (Seawall) shown in the Detail entitled "BOULDER RETAINING WALL (SEAWALL)DETAIL". All work shall be in accordance with the latest edition of the NC State Residential Building Code and all other applicable codes, ordinances and requirements. See Detail on Sheet C-2 for addition requirements. 2. Coordinate all work with the 401 /404 NWP and Water Quality Permit(s). Verify all dimensions prior to beginning work. Locate, verify and protect all underground utilities. 3. Satisfactory material for fill or backfill behind retaining walls and other structures shall be limited to materials classified in ASTM D 2487 as SW, SP, SM, SW—SM, SC, SW, SC, SP—SM, and SP—SC. Satisfactory materials shall be placed in 6" compacted lifts. Material shall be compacted to 98% of the maximum dry density. Classification of backfill materials shall be determined in accordance with ASTM D 2487 and the moisture—density relations of soils shall be determined in accordance with ASTM D 1557. 4. BOULDERS. Maintain minimum boulder wall thickness of 1.5Ft. x 3Ft x 6Ft All boulders used in retaining walls shall be sound durable granite with a 1.5—ft minimum dimension. Provide chinking stories to reduce gaps between boulders to less than 1 inch. Securely stack boulders to ensure that boulders have a positive angle of 5—degrees or more with respect to the horizontal. 5. Assumptions: a. Site is assumed to have stable geotechnical conditions with no unsatisfactory soil types. b. Retaining walls are assumed to have passenger vehicle surcharge only. c. Soil Bearing Capacity = 3500 psf d. Down slope embankments and retaining walls are assumed to be stable and have sufficient capacity to support the surcharge of the up slope retaining wall. Contractor shall investigate the condition and stability of all existing down slope embankments. Reinforce slopes and embankments as necessary to support this retaining wall section. 6. GEOTEXTILE FABRIC SOIL ANCHORS. Geotextile fabric for soil anchors shall be Miragrid 20XT Geogrid. Geogrid shall be rolled out in horizontal sheets and cut to lengths, with no field connections. After rolling out, the geogrid shall be tensioned by hand until it is taut and free of wrinkles, and lying flat. Compacted fill shall be placed over geogrid in 6" compacted lifts, see Note 3 above. LENGTH OF GEOTEXTILE ANCHOR = 3 X WALL HT. 7. WALL BATTER. Wall batter shall be 0.25H:1 V or shallower. 8. HORIZONTAL BENCH. Maintain minimum 5 feet wide horizontal bench at toe of wall before sloping. 9. EMBEDMENT DEPTH. Embed toe of wall a minimum of 2—FT into undisturbed residuum. 10. FOUNDATION BEARING AREA. locate boulder retaining wall foundation on undisturbed residuum with a minimum bearing capacity of 3,500 PSF. 11. FINISH GRADE BEHIND WALL. Provide 3H:1 V or shallower for a maximum 7 vertical feet and horizontal thereafter. 12. CHIMNEY DRAIN. Provide No. 57 clean stone wrapped in non—woven needle punched geotextile fabric with a minimum thickens of 1—foot. 13. BLANKET DRAIN. Provide No. 57 clean stone wrapped in non—woven needle punched geotextile fabric with a minimum thickens of 1—foot above normal pool elev. All backfill below normal pool elevation shall be #57 stone. 14. FOUNDATION LEVELING PAD. Provide 18"x4'xContinuous reinforced concrete footer or compacted aggregate stone for the boulders to bear. Concrete Footer to be reinforced with 6 #6 longitudinal bars continuous and #6 transverse bars at 24' o.c.. Concrete shall have a 28 day compressive strength of 4000 psi and shall have 5 to 7% entrained air. Rebar shall be grade 60. Do not allow fresh concrete to contact surface waters. 15. All stormwater shall be diverted around and away from the boulder retaining wall. Do not allow up slope stormwater to enter the chimney drains or blanket drains. 16. This is a supplemental retaining wall detail that is intended to be used for the Boulder Seawall Repair. The location and alignment shall match existing. By accepting this engineering document, the Owner, Contractor and any others to whom it is distributed, agree to a strict limitation of liability for Terry E. Allen PE, T.E. ALLEN ENGINEERING, P.C., and its employees to an amount not to exceed $25,000.00 or one—half the total amount of paid invoices, whichever is less. 17. ROCK PINNING. Where shallow subgrade rock is encountered, the bottom course of all Boulders Retaining Walls shall be pinned to competent subgrade rock with two (2) #8 epoxy coated rebar per each bottom boulder. Embedded rebar rock pins 24" into sound subgrade rock and secured in place with 5000 psi hydraulic cement. PRELIMINARY — NOT FOR CONSTRUCTION r, �r 00 �N E 0 j U U `ZLO 0E i:EaON�'j o o S 3 �a-6Xr-'E -00`000 �2UH� 2 0 0+00 -r- CL ;vr� -1c E LC�MJa� O+ o_ 0Z MM 3= 06 `� o x co -a u U o uwiW �zco tY N C LO C) co .. mQ [z zU co C F. M 1 00-:4-2018 1 C Copyright 2018 T.E. ALLEN ENGINEERING PC. All Rights Reserved Worldwide. C-5 j ( DO NOT SCALE DRAWINGSg SHEET 5 O 5