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HomeMy WebLinkAboutSW8950215_Current Permit_20141125ALTMA6 NCDENR North Carolina Department of Environment and Natural Resources Pat McCrory Governor November 25, 2014 Mr. Ron Stancil, President Beacon Woods HOA, Inc. c/o CAMS 1612 Military Cutoff Rd, #108 Wilmington, NG 28403 Subject: State Stormwater Management Permit No. SW8 950215 Beacon Woods High Density Subdivision Wet Pond Project New Hanover County Dear Mr. Stancil: John E. Skvada, III Secretary Effective August 1, 2013 the State Stormwater program has been transferred from the Division of Water Quality (DWQ) to the Division of Energy, Mineral and Land Resources (DEMLR). All previous references to DWQ will remain in older stormwater permits issued prior to August 1, 2013 until they are modified. Please note that any updated pages or addendums to the permit will now reference DEMLR as the Division responsible for issuance of the permit. The Wilmington Regional Office received a complete, modified State Stormwater Management Permit Application for the subject project on November 14, 2014. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 21-1.1000, effective January 1,1988. We are forwarding Permit No. SW8 950215 dated November 25, 2014, for the construction, operation and maintenance of the BMP's and built -upon area associated with the subject project. This permit shall be effective from the date of issuance until rescinded and shall be subject to the conditions and limitations as specified therein. The following requirements are continued from the attached Certification of Compliance originally issued on April 24,1995 and transferred to the HOA on February 6, 2013: 1. Staff review of the project plans and specifications, including the statement of intent has determined that the stormwater control system as proposed for Beacon Woods Subdivision will comply with the Stormwater Regulations set forth in Title 15A NCAC 21-1.1003(i), effective January 1,1988. This Certification is to restrict the built -upon area for each of the 112 lots, as shown on the approved plan. 2. Any modification of the plans submitted to and approved by this Office or further development of this site regardless of the fact that the modification may be less than 1 acre, will require an additional Stormwater Submittal/Modification and approval prior to initiation of construction. Modifications include but are not limited to; project name changes, transfer of ownership, redesign of built -upon surfaces, addition of built -upon surfaces, redesign or further subdivision of the project area. This Cerfification shall be effective from the date of issuance until rescinded. The project shall be constructed and maintained in accordance with the plans and specifications approved by the Wilmington Regional Office, This Certification does not supersede any other permit or approval. The developer is responsible for obtaining any and all permits and approvals necessary for the development of this project. This could include the Division of Coastal Management under CAMA requirements, the Division of Water Resources Wetland 401 Water Quality Certification and/or a Dredge and Fill Permit and/or a Sewer Extension/Collection Permit, U.S. Army Corps of Engineers 404 Wetland Permit, NPDES Stormwater Permit if disturbing five acres or more, local County or Town Agency permits under their local ordinances, or others that may be required. 4. A professional engineer must certify. that the stormwater system has been installed in accordance with the approved plans and specifications upon completion of construction. The attached certification should be received by this Office within 30 days of completion of construction. 5. The detention pond must be constructed in its entirety, operational for its intended use, and permanently vegetated prior to the construction of any impervious surfaces proposed as a part of the project, except roads. Division of Energy, Mineral, and Land Resources Land Quality section — Wilmington Regional Office 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 • (910) 796-7215 / Fax: (910) 350-2004 SW8 950215 November 26, 2014 The following modifications are included and covered by this permit: 1. All lots shall be limited to 4,000 square feet of impervious area per lot with the exception of Lot 77 which is approved for 5,100sf of impervious area. The runoff from the impervious area specified in the summaries for Ponds 1 and 2 will be treated to achieve 90% reduction in Total Suspended Solids. Two-thirds of each lot must be graded to drain into the street. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150B of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431- 3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Kelly Johnson in the Wilmington Regional Office, at (910) 796-7215. Anc,' i ctor ;� ry Davis, P.E., Director Division of Energy, Mineral and Land Resources GDS/kpj: 111Stormwater Permits & Projects119951950215 HD1201411 permit 950215 cc: Mr. Andrew Tomlin, 5104 Woods Edge Dr, Wilmington NC 28409-3974 Mr. Phil Tripp, PE Inspector, New Hanover County Inspections New Hanover County Engineering Division of Coastal Management Wilmington Regional Office Stormwater File Page 2 of 2 Certification of Compliance: SW8 950215 Pond 1: Water Body Receiving Stormwater Runoff. Classification of Water Body: If Class SA, chloride sampling results: Pond Depth: Permanent Pool Elevation: Total Impervious Surfaces Allowed: Offsite Area entering Pond: Required Surface Area: Provided Surface Area: Required Storage Volume: Provided Storage Volume: Temporary Storage Elevation: Controlling Orifice Type/Diameter: Pond 2: Water Body Receiving Stormwater Runoff: Classification of Water Body: If Class SA, chloride sampling results: Pond Depth: Permanent Pool Elevation: Total Impervious Surfaces Allowed: Offsite Area entering Pond: Required Surface Area: Provided Surface Area: Required Storage Volume: Provided Storage Volume: Temporary Storage Elevation: Controlling Orifice Type/Diameter: State Stormwater Management Systems Permit No. SW8 950215 LIT Whiskey Creek "SC 20 6.0 feet 21.3 MSL 304,780 square feet (52 Lots at 4,OOOsfllot) 0 square feet 16,165 square feet 18,275 square feet 32,924 cubic feet 39,840 cubic feet 23.3 MSL 23/d" pipe UT Whiskey Creek "SC" 20 mg/I 6.0 feet 21.0 MSL 333,360 square feet Lot 77: 5,100sf All of the other 59 lots: 4,000sf/lot 0 square feet 17,971 square feet 21,775 square feet 38,483 cubic feet 47,012 cubic feet 23.0 MSL 2-7/8" pipe Wet Pond Evaluation: 1. The design storage is for the runoff from all impervious surfaces resulting from 1-inch of rainfall and is located above the permanent pool. 2. The permanent pool is designed for 90% total suspended solid (TSS) removal. Therefore, no vegetative filter is required. 3. The runoff completely draws down to the permanent pool in 5 days, but not less than 2 days. 4. The mean depth of the permanent pool is a minimum of 3 feet. 5. The inlet stricture is designed to minimize turbulence and short circuiting. 6. THIS PROJECT MEETS THE STORMWATER CONTROL REQUIREMENTS OF 15A NCAC 2H.1003 (g), (i), (k), and (1) , effective January 1,1988. 7. These detention ponds are designed to remove 90% total suspended solids without the aide of a vegetative filter. Page 3 State Stormwater Management Systems Permit No. SW8 950215 Permit modified and reissued this the 25th day of November 2014 NOR CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Tracy Davig, P.E., Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Permit Number'SW8 950215 Page 4 DEMLR USE ONLY Date Receiv d Paid _ _ Permit Number - i i — i &.r Applicable Rules: ' ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph I - Post onstruction 11 (select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan ❑ Other WQ MRmt Plan: State of North Carolina Department of Environment and Natural Resources Division of Energy, Mineral and Land Resources STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Beacon Woods Subdivision 2. Location of Project (street address): Woods Edge Road City:Wilmington County:New Hanover Zip:28409 3. Directions to project (from nearest major intersection): From the intersection of NC 132 (South College Road) and SR 2573 (Woods Edge Road), travel a1212roximately 0.36 mile on Woods Edge Road to the beginning of the subdivision 4. Latitude:34° 08' 46" N Longitude:77° 52' 21" W of the main entrance to the project. II. PERMIT INFORMATION: 1. a. Specify whether project is (check one): ❑New ®Modification ❑ Renewal w/ Modificationt tRenewals with modifications also requires SWU-102 - Renewal Application Form b.If this application is being submitted as the result of a modification to an existing permit, list the existing permit numberSW8 950215 , its issue date (if known)04/25/1995 , and the status of construction: []Not Started ❑Partially Completed* ® Completed* *provide a designer's certification 2. Specify the type of project (check one): ❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other 3. If this application is being submitted as the result of a previously returned application or a letter from DEMLR requesting a state stormwater management permit application, list the stormwater project number, if assigned, and the previous name of the project, if different than currently proposed, 4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑LAMA Major ❑Sedimentation/Erosion Control: ac of Disturbed Area ❑NPDES Industrial Stormwater ❑404/401 Permit: Proposed Impacts b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number, issue date and the type of each permit: 5. Is the project located within 5 miles of a public airport? ®No ❑Yes If yes, see S.L. 2012-200, Part VI: httl2://12ortal.ncdenr.org/web/Ir/rules-and-reLyulam&Ac= .. f1h C 1VC ,j C NOV 14 2014 Form SWU-101 Version Oct. 31, 2013 Page 1 of 6 III. CONTACT INFORMATION 1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the12roject): Applicant/Organization:Beacon Woods HOA, Inc. Signing Official & Title:Ron Stancil, President b. Contact information for person listed in item 1a above: Street Address:c/o CAMS,1612 Military Cutoff Road #108 City: Wilmington State:NC Zip:28403 Mailing Address (if applicable): City: State: Phone: (910 ) 256-2021 Fax: Email:rncstancil@hotmail.com Zip: c. Please check the appropriate box. The applicant listed above is: ® The property owner (Skip to Contact Information, item 3a) ❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below) ❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and 2b below) ❑ Developer* (Complete Contact Information, item 2a and 2b below.) 2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the person who owns the property that the project is located on): Property Owner/Organization: Signing Official & b. Contact information for person listed in item 2a above: Street Address: City: State: Zip: Mailing Address (if applicable): City: State: Phone: ( ) Fax: Email: Zip: 3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other person who can answer questions about the project: Other Contact Person/Organization:CAMS Community Association Management Signing Official & Title:Mary Ann Crump Community Manager b. Contact information for person listed in item 3a above: Mailing Address:1612 Military Cutoff Road #108 City:Wilmington State:NC Zip:28403 Phone: (2910 ) 256-2021 Fax: L ) Email:mcrump@crosmgt.com 4. Local jurisdiction for building permits: Point of Contact: Phone #: NOV 1 F3v: Form SWU-101 Version Oct. 31, 2013 Page 2 of 6 IV. PROJECT INFORMATION 1. Ift the space provided below, briefly summarize how the stormwater runoff will be treated. Wet detention basins 2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved: ❑ Approval of a Site Specific Development Plan or PUD Approval Date: ❑ Valid Building Permit Issued Date: ❑ Other: Date: b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with: ® Coastal SW -1995 ❑ Ph II - Post Construction 3. Stormwater runoff from this project drains to the Cape Fear River basin. 4. Total Property Area: 43.57 acres 5. Total Coastal Wetlands Area: 0 acres 6. Total Surface Water Area: 0 acres 7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project Area+:43.57 acres + Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area between the banks of streams and rivers, the area below the Normal Hi h Water (NHW, line or Mean High Water (MHM line, and coastal wetlands landward from the NHW (or ZA line. The resultant project area is used to calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may be included in the total project area. 8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 33.6 % 9. How many drainage areas does the project have?2 (For high density, count 1 for each proposed engineered Stormwater BMP. For low density and other projects, use 1 for the whole property area) 10. Complete the following information for each drainage area identified in Project Information item 9. If there are more than four drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Basin Information Drainage Area 1 Drainage Area 2 Drainage Area _ Drainage Area _ Receiving Stream Name Mott Creek Mott Creek Stream Class * CSw CSw Stream Index Number * 18-82 18-82 _ Total Drainage Area (so 926,521 971,390 On -site Drainage Area (so 926,521 971,390 Off -site Drainage Area (sf) - - Proposed Impervious Area** s 304,780 333,360 % Impervious Area* total 32.9 34.3 Impervious' Surface Area Drainage Area 2 Drainage Area 2 Drainage Area _ Drainage Area _ On -site Buildings/Lots (sf) 208,000 241,100 On -site Streets (sf) 96,780 92,260 On -site Parking (sf) - _ On -site Sidewalks (so Other on -site (so Future (sf) Off -site (so Existing BUA*** (sf) Total (sf): 304,780 333,360 Stream Class and Index Number can be determined at: Sidewalks, gravel areas, etc. NOV 1 ht . ortal.ncdenr.or oeb -S I Impervious area is defined as the built upon area including, but not Iimited to, builds, roads, parkin Sidewalks, � *** Report only that amount of existing B UA that will remain after development. Do nct Deport any extshnghat is to be removed and which will be replaced by new BUA. Form SWU-101 Version Oct. 31, 2013 Page 3 of 6 11. How was the off -site impervious area listed above determined? Provide documentation. NA Proiects in Union County: Contact DEMLR Central Office staffto check if the project is located within a Threatened & Endangered Species watershed that may be subject to more stringent stormwater requirements as per 1 SA NCAC 02B .0600. V. SUPPLEMENT AND O&M FORMS The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded from h!U2://portal.ncdenr.or/web/wq/ws/su/bmp-manual. VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application instruction sheet and BMP checklists are available from h!W://portal.ncden,r.org/web/­­wg/­ws/su/statesw/forms dots. The complete application package should be submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the interactive online map athttp://portal.ncdenr.org/web/wq/ws/su/maps.) Please indicate that the following required information have been provided by initialing in the space provided for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for each submitted application package from hgp://I?ortal.ncdenr.org/web/wq/ws/­­su/statesw/forms—docs. 1. Original and one copy of the Stormwater Management Permit Application Form. 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants Form. (if required as per Part VII below) 3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M agreement(s) for each BMP. 4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to ht!p://w-ww.envhelD.org/gages/onestol2express.htm] html for information on the Express program and the associated fees. Contact the appropriate regional office Express Permit Coordinator for additional information and to schedule the required application meeting.) 5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor the project. This is required in addition to the brief summary provided in the Project Information, item 1. 6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the lh4A receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the 1/2 mile radius on the map. 7. Sealed, signed and dated calculations (one copy). 8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including: N & a. Development/Project name. b. Engineer and firm. c. Location map with named streets and NCSR numbers. d. Legend. e. North arrow. f. Scale. g. Revision number and dates. h. Identify all surface waters on the plans by delineating the normal pool elevation of impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal waters, and any coastal wetlands landward of the MHW or NHW lines. • Delineate the vegetated buffer landward from the normal pool elevation of impoun ed structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waterAC E IVE i. Dimensioned property/project boundary with bearings & distances. j. Site Layout with all BUA identified and dimensioned.4 NOV 1 201�F k. Existing contours, proposed contours, spot elevations, finished floor elevations. 1. Details of roads, drainage features, collection systems, and stormwater control measu�es.:' m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a �= qualified person. Provide documentation of qualifications and identify the person who made the determination on the plans. n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations. o. Drainage areas delineated (included in the main set of plans, not as a separate document). Form SWU-101 Version Oct. 31, 2013 Page 4 of 6 p. Vegetated buffers (where required). 9. , Copy of any applicable soils report with the associated SHWT elevations (Please identify 11JA elevations in addition to depths) as well as a map of the boring locations with the existing elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the project area clearly delineated. For projects with infiltration BMPs, the report should also include the soil type, expected infiltration rate, and the method of determining the infiltration rate. (Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to verify the SHVVT prior to submittal, (910) 796-7378.) 10. A copy of the most current property deed. Deed book: 2492 Page No: 0126 11. For corporations and limited liability corporations (LLC): Provide documentation from the NC Secretary of State or other official documentation, which supports the titles and positions held by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 2H.1003(e). The corporation or LLC must be listed as an active corporation in good standing with the NC Secretary of State, otherwise the application will be returned. hM2://www.secretary.state.nc.us/Corporations/CSearch aspx VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and protective covenants forms can be downloaded from htW://portal.ncdenr.org/web/lr/state-stormwater- forms does. Download the latest versions for each submittal. In the instances where the applicant is different than the property owner, it is the responsibility of the property owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring that the deed restrictions are recorded. By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and protective covenants for this project, if required, shall include all the items required in the permit and listed on the forms available on the website, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the NC DEMLR, and that they will be recorded prior to the sale of any lot. VIII. CONSULTANT INFORMATION AND AUTHORIZATION Applicant. Complete this section if you wish to designate authority to another individual and/or firm (such as a consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as addressing requests for additional information). Consulting Engineer:Phillip G. Tripp, P.E. Consulting Firm: Tripp Engineering Mailing Address:419 Chestnut Street City:Wihnington Phone: (910 ) 763-5100 Email:trippeng2ec.rr.com State:NC Zip:28401 Fax: (910 ) 763-5631 IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this section) I, (print or type name of person listed in Contact Information, item 2a) , certify that I own the property identified in this permit application, and thus give permission to (print or type name of person listed in Contact Information, item 1a) with (print or type name of organization listed in Contact Information, item 1a) to develop the project as currently proposed. A copy of the lease agreement or pending property sales contract has been provided with the submittal, which indicates the parry responsible for the operation and maintenance of the stormwater system. CEIVE NOV 14 2014 BY: Form SW-101 Version Oct. 31, 2013 Page 5 of 6 As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6. Signa Date: a Notary Public for the State of County of do hereby certify that personally appeared before me this _ day of . and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission expires X. APPLICANT'S CERTIFICATION 1, (print or type name of person listed in Contact Information, item 1a) Ron Stancil, (current) President of Beacon Woods HOA, Inc. certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of the applicable stormwater r er 15A NC .1000 and any other applicable state stormwater requirements. �1 Date: /, -/54 I, Va f,5 a: E V , a Notary Public for the State of ZV C -County of N do hereby certify that RGn.9 S' f�/ �'� personally appeared before me this I3 day of NW4 4 and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, eww�"g,1S J. Q® '• s • N®TARY .•• •� �" —fir-- ': PUBLIC a U ••. � ,ems gym® �'••.......•'•�.�� gNOVER_�.•. SEAL My commission expires l ' ECIEIVIElft NOV 14 2014 r M Form SWU-101 Version Oct. 31, 2013 Page 6 of 6 Permit No. Stv8 1756215 to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMEENT This form may be photocopied for use as an original DWQ Stormwater Management Plan Review: A complete storinwater management plans mittal includes a wet detention basin supplement for each basin, design calculations, plans and specifications showing all basin and outlet structure details, and a signed and notarized operation and maintenance agreement. I. PROJECT INFORMATION (please complete the following information): Project Name : 2(6n WCX.A- 5 Su6dy(!5 f w) Contact Person: HDA .' 4y C,4)y5 Phone Number: (tq/V) ZSCP 3'7R2 For projects with multiple basins, specify which basin this worksheet applies to: '- Basin Bottom Elevation 15,3 ft, Permanent Pool Elevation 21. 3 ft. Temporary Pool Elevation 23.3 ft. Permanent Pool Surface Area 1$, Z75 sq. ft. Drainage Area Impervious Area Permanent Pool Volume Temporary Pool Volume Forebay Volume SA/DAI used Diameter of Orifice Design TSS Removal 17, 92 ac. r7 ac. OA cu. ft. 390 640 cu. ft. 01.A cu.-ft. 1,-145 7-35 in. U. REQUIRED ITEMS CHECKLIST (average elevation of the floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) (water surface area at the orifice elevation) (on -site and off -site drainage to the basin) (on -site and off -site drainage to the basin) (combined volume of main basin and forebay) (volume detained above the permanent pool) (surface area to drainage area ratio) (85% TSS removal required, see item k below) The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. If a requirement has not been met, attach justification. Form SWU-102 Rev I/August 1998 Page 1 of 3 Applicants Initials a. The temporary pool controls runoff from the 1 inch storm event. b. The basin length to width ratio is greater than 3:1. c. The basin side slopes above the permanent pool are no steeper than 3:1. d. A submerged and vegetated perimeter shelf at less than 6:1 is provided (show detail). e. Vegetation above the permanent pool elevation is specified. f. An emergency drain is provided to empty the basin. g. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). h. The temporary pool draws down in 2 to 5 days. i. A trash rack is provided for both the overflow and orifice. j. The forebay volume is approximately equal to 20% of the total basin volume. k. Sediment storage is provided in the permanent pool. 1. A 30-foot vegetative filter is provided at the outlet2 (include erosive flow calculations) m. Recorded drainage easement for each basin including access to nearest right-of-way. n. A site specific operation and maintenance (O&M) plan is provided. o. A vegetation management/mowing schedule is provided in the O&M plan. p. Semi-annual inspections are specified in the O&M plan. q. A debris check to be performed after every storm event is specified in the O&M plan. r. Specific clean -out benchmarks are specified in the O&M plan (elevation or depth). s. A legally responsible parry is designated in the O&M plan3 (include name and title). t. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified to be performed prior to use as a wet detention basin. Footnotes: 1 When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non- standard table entries. 2 The requirement for a vegetative filter may be waived if the wet detention basin is designed to meet 90% TSS removal. 3 The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wet detention basin system is defined as the wet detention basin, forebay, non-integrated pretreatment systems (pretreatment other than forebays),, and the vegetated filter if one is provided. This system (check one) ❑ does ❑ does not incorporate a vegetated filter. This system (check one) ❑ does ❑ does not incorporate non-integrated pretreatment. Maintenance activities shall be performs as follows: 1- After every significant runoff producing rainfall event and at least monthly: Form SWU-102 Rev 1/August 1998 Page 2 of 3 a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, grass cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The original design depth is: (p The sediment removal benchmark dep is: 4.13 5. Remove cattails and other indigenous wetland plants when they cover 75% of the basin surface. These plants shall be encouraged to grow along the basin perimeter. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. 7. All components of the wet detention basin system shall be maintained in good working order. I acknowledge and agree by my signature below that I am responsible for the performance of the above maintenance procedures. I agree to notify DWQ of any problems with the system or changes in the name of the project, responsible party, or address. Print name: De-bbie L. vc 7- Address: IV _-, Phone: qly ) _. s - 7g7 Title: Co"Im un i +E4 M art 4g49 r -may Signature: Date: 3/ 9 / 4 q a A ° + ZLe�,� a Notary Public for the State of nc-� County of _blf i) .n n b\l a' , do hereby certify that `behh ' , Le f z— personally appeared before me this . day of [i 6jr C Ir1 , 19—q 0 and acknowledge the due execution of the forgoing infiltration system maintenance requirements. Witness my hand and official seal, iviy commission expires I (V I b-;-Is Form SWU-102 Rev 1/August 1998 Page 3 of HE�Z `ft, SEAL��° �5P ....:..,. �, WE y AUBL%G :?V ��w a u �a"M Permit Number: /4 ` (to be provided by DWQ) Drainage Area Number: Wet Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ® does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ® does not incorporate pretreatment other than a forebay. Important maintenance procedures: - Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). - No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. - Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. - If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. - Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: How I will remediate theproblem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the wet detention basin Areas of bare soil and/or erosive gullies have formed. Regrade the soil if necessary to remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Vegetation is too short or too long. Maintain ve a io ight of a_,Uj�ft Form SW401-Wet Detention Basin O&M-Rev.4 Nov 14 20% rue 1 of 4 Permit Number: (to be provided by DWQ) Drainage Area Number:. BMP element: Potentialproblem: I How I will remediate theproblem: The inlet device: pipe or swale i The pipe is clogged. L Unclog the pipe. Dispose of the sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged. ` { Erosion is occurring in the Regrade the swale if necessary to swale. smooth it over and provide erosion ! control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage. dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed practices to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other invasive plants cover 50% of Remove the plants by wiping them with pesticide (do not spray). the basin surface. i EVEIVE Nov 14 20% Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 13Y: Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if a licable The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 4.5 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads NA feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) V Permanent Pool Elevation 21.0 Sediment Removal . NA Pe manen Pool - - - - - - - - - - - - - - Volume Sediment Removal Elevation 16.5 Volume Bottom Elevatio NA -ft Min. ------------------------------------------ - --- a Sediment Bottom Elevation 15.0 1-ft Storage Sedimei Storage FOREBAY MAIN POND Form SW401-Wet Detention Basin O&M-Rev.4 C c F-, !rI E oh Nov 14 2014 BY: p Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:Beacon Woods Subdivison BMP drainage area number:2 Print name:Ron Stancil Title:President, Beacon Woods HOA, Inc. Address:c/o CAMS, 1612 Military Cutoff Road #108 Wilmington NC 28403 Phone Signat Date: ! r 0 - 150 ( T Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I,yon` S 3: . - nJ.v , a Notary Public for the State of A). C. , County of„AcEUJ 0,) tiQ , do hereby certify that R0/0 5-PA n) C i _ _ personally appeared before me this _I1 day of A�J f ,rh b q r , ;�O / y , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, 01 ` SS11ie.e.,#* •• 1S J. 0Q`,........ .• m :• NOTARY ••�� • i �►.ygN011�� Col ��•hMass�+�� SEAL My commission expires :31 /U0-"rA r MECEIVEML NOV 14 2014 6Y. Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4 Permit Number SW8950215 Program Category State SW Permit Type State Stormwater Primary Reviewer kelly.johnson Coastal SWRule Coastal Stormwater 1988 Permitted Flow Facility Central Files: APS _ SWP _ 11/25/2014 Permit Tracking Slip Status Project Type Active Major modification Version Permit Classification 1.20 Individual Permit Contact Affiliation Facility Name Major Minor Region Beacon Woods Subdivision Minor Wilmington Location Address County Woods Edge Rd New Hanover Facility Contact Affiliation Wilmington NC 28409 Owner Owner Name Owner Type Beacon Woods HOA Inc Non -Government Owner Affiliation Ron Stancil Co Cams 1612 Military Cutoff Rd #108 Dates/Events Wilmington NC 28403 Scheduled Orig Issue App Received Draft Initiated Issuance Public Notice Issue Effective Expiration 4/25/1995 11/14/2014 11/25/2014 11/25/2014 Regulated Activities Requested /Received Events State Stormwater - HD - Detention Pond Deed restriction received Deed restriction requested Outfall Waterbody Name Streamindex Number Current Class Subbasin