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HomeMy WebLinkAboutSW7060806_CURRENT PERMIT_20070205STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW �V� DOC TYPE CURRENT PERMIT rAPPROVEDPLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD ATFR �QG r 2007 Mr. James M. Corcoran Atlantic Beverage, Inc. 1702 Red Robin Lane New Bern, NC 28562 WaRo Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Subject: Permit No. SW7060806 Atlantic Beverage, Inc. High Density Stormwater Project Craven County Dear Mr. Corcoran: Alan W. Klimek, P.E. Director Division of Water Quality The Washington Regional Office received a completed Stormwater Application for the subject project on November 9, 2006. 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 2H.1000. We are forwarding Permit No. SW7060806 dated February 5, 2007 to Atlantic Beverage, Inc. for the construction and operation of a wet detention pond and a bioretention Basin to serve the expansion of Atlantic Beverage, Inc. located at 1702 Red Robin Lane in New Bern, NC. This permit shall be effective from the date of issuance until February 5, 2017 and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699-6714. 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 Roger Thorpe or me at (252) 946-6481. A'AI,nce' �-odge, Regional Supervisor Surface Water Protection Section Washington Regional Office cc: Avolis Engineering, P.A. City of New Bern Inspections ,/Washington Regional Office Central Files North Carolina Division of Water Quality Internet: "X%I% ncwateruuahtv.ora 943 Washington Square Mall Phone (252) 946-6481 Washington, NC 27889 Fax (252) 946-9215 NorthCarolina Naturally An Equal Opportunity/Affrmalive Action Employer— 50% Recyderl/10% Post consumer Paper State Stormwater Management Systems Permit No. SW7060806 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Atlantic Beverage, Inc. Craven COUNTY FOR THE construction, operation and maintenance of stormwater management systems in compliance with the provisions of 15A NCAC 2H.1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit for a wet detention pond and a bioretention basin to serve the expansion of Atlantic Beverage, Inc. located at 1702 Red Robin Lane in New Bern, NC. This permit shall be effective from the date of issuance until February 5, 2017 and shall be subject to the following specified conditions and limitations: DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described on page 2 of this permit, the Project Data Sheet. 3. A maximum of 68,555 square feet of built upon area is allowed on this 2.31 project site. 4. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with approved plans. 5. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. Project Name: Permit Number: Location: Applicant: Mailing Address: Application Date: Receiving Stream: Classification of Water Body: Total Site Area: Drainage Basin: Drainage Area to Basin: Total Impervious: Pond Depth: Required Storage Volume: Provided Storage Volume: Required Surface Area: Provided Surface Area: Controlling Orifice: DIVISION OF WATER QUALITY PROJECT DATA Atlantic Beverage, Inc. SW7060806 Craven County Atlantic Beverage, Inc. 1702 Red Robin Lane New Bern, NC 28562 8/112006 (Original) UT to Trent River C-NSW 2.31 ac Wet Pond 78,600 sf 50,335 sf 3.0 ft 4,100 cf 4,684 cf 5,848 sf 6,096 sf 1.0 in @ elev. 13.8 ft Bioretention Basin 22,220 sf 18,220 sf 9.0 in 1,458 cf 1,562 cf 1,555 sf 2,083 sf Bypass at @ elev. 18.2 ft 6. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division. The following items will require a modification to the permit: a. Any revision to the approved plans, regardless of size b. Project name change C. Transfer of ownership d. Redesign or addition to the approved amount of built -upon area e. Further subdivision of the project area. In addition, the Director may determine that other revisions to the project should require a modification to the permit. 8. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. II. SCHEDULE OF COMPLIANCE The permittee will comply with the following schedule for construction and maintenance of the stormwater management system. a. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surfaces except roads. b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 2. The facilities must be properly maintained and operated at all times. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency including, but not limited to: a. Semiannual scheduled inspections (every 6 months) b. Sediment removal c. Mowing and revegetation of side slopes d. Immediate repair of eroded areas e. Maintenance of side slopes in accordance with approved plans and specifications f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 6. Upon completion of construction and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Mail the Certification to the Washington Regional Office, 943 Washington Square Mall, Washington, North Carolina, 27889, attention Division of Water Quality. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of five years from the date of the completion of construction. Ill. GENERAL CONDITIONS 1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Water Quality accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143- 215.6(a) to 143-215.6(c). 3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction. 4. in the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 6. The Permittee, at least six (6) months prior to the expiration of this permit, shall submit in writing a request for an extension along with appropriate application fee. Permit issued this the 5 th day of February, 2007. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT Alan W. Klimek, P.E. Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW7060806 Atlantic Beverage, Inc. - Craven County Stormwater Permit No. SW7060806 Designer's Certification 1, , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, for (Project Owner) hereby state that to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. Signature Registration Number Date Certification Requirements: 1. The drainage area to the systems contains approximately the permitted acreage. 2. The drainage area to the systems contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the systems. 5. The outlet/bypass structure elevations are per the approved plan. 6. The outlet structures are located per the approved plans. 7. Trash rack is provided on the outlet/bypass structure. 8. All slopes are grassed with permanent vegetation and are no steeper than 3:1. 9. The inlets are located per the approved plans and do not cause short-circuiting of the system. 10. The permitted amounts of surface area and/or volume have been provided. 11. All required design depths are provided. 12. Required drawdown devices are correctly sized per the approved plans. 13. All required parts of the system are provided, such as a vegetated shelf, forebay and vegetated filter if required. 14. The required system dimensions are provided per the approved plans. USE - 6. Directions to project (from nearest major intersection): 200' south of the intersection of US 17 and Red Robin bane along Red Robin Lane. 7. Latitude: 350-5.953' N Longitude: 770-5.439' W of project ro'ect 8. Contact person who can answer questions about the project: Name: Joe Avolis, PE Telephone Number: ( 252 ) 633-0068 II. PERMIT INFORMATION: 1. Specify whether project is (check one): X New Renewal Modification Form SWU-101 Version 3.99 Page 1 of 2. if this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number NSA and its issue date (if known) 3. Specify the type of project (check one): _Low Density X High Density Redevelop __General Permit Other 4. Additional Project Requirements (check applicable blanks). _CAMA Major X Sedimentation/Erosion Control _404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project . The project consists of two separate stormwater basins. Basin #1 is treated by a wetpond sized for 90% TSS removal Basin #2 is treated by a bio-retention area 2. Stormwater runoff from this project drains to the 3. Total Project Area: 2.31 acres 5. How many drainage areas does the project have? 2 Neuse River basin. 4. Project Built Upon Area: 68.0 6. Complete the following information for each drainage area. If there are more than two 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 I Drainage Area 2 Receiving Stream Name Trent River Trent River- Receiving Stream Class Drainage Area SB; SW, NSW 78, 6005F SB; SW, NSW 22 220SF Existing Impervious* Area 23 360 11950 Proposed Impervious*Area 26,975 16,270 Impervious* Area (total) 64.0 82.0 Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings 24,235 11,420 On -site Streets 0 0 On -site Parking 26,100 6,800 On -site Sidewalks 0 0 Other on -site 0 0 Off -site 0 0 Total: 50, 335SF Total: 18, 220SF Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version 3.99 Page 2 of 7. How was the off -site impervious area listed above derived? Survey & Site visit IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment. 1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than 68,555 square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, 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 State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 4 VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. • Original and one copy of the Stornwater Management Permit Application Form • One copy of the applicable Supplement Form(s) for each BMP • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications, including: - Development/Project name - Engineer and firm -Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VIL AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm): AvoliS Engineering, P.A. Mailing Address: P.O.Box 15564 City: New Bern State: NC Zip: 28562 Phone:( 252 ) 633-0068 Fax: ( 252 ) 633-6507 VIII. APPLICANT'S CERTIFICATION 1, (print or type name of person listed in General Information, item 2) James M. Corcoran 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 15A NCAC 2H .1000, Date. J 20v (._0 Form SWU-101 Version 3.99 Page 4 of Permit No. (to be promded br Dti'Q) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. 1. PROJECT INFORMATION Project Name: Atlantic Beverage, Inc Contact Person: Joe Avolis P.E. Phone Number: ( 252 ) 633-0068 For projects with multiple basins, specify which basin this work -sheet applies to: Detention elevations Basin Bottom Elevation Permanent Pool Elevation Temporary Pool Elevation areas Permanent Pool Surface Area Drainage Area Impervious Area vohnnes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DA I Diameter of Orifice Design Rainfall Design TSS Removal '- Pond 10.8 ft. (floor of the basin) 13.8 ft. (elevation of the orifice) 14.5 ft. (elevation of the discharge structure ovetfloir) 6,096 sq. ft. (water surface area at the orifice elevation) 1.8 ac. (on -site and off -site drainage to the basin) 1.16 ac. (on -site and off -sire drainage to the basin) 7;112 cu. ft. (combined volume of nnain basin and forebav) 4,684 cu. ft. (volume detained above the permanent pool) 1,519 cu. ft. (approximately 20% of total volume) 0.0744 (surface area to drainage area ratio.from DH'O table) 1 in. (2 to 5 day temporary pool dram --down required 1 in. 90 % (minimum 85% required) Form SWU-102 Rev 3.99 Paee I of 4 Footnotes: 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. '- In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90%TSS removal. The NCDENR BMP manual provides design tables for both 85%TSS removal and 90%TSS removal. II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stonnwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) 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 Stonnwater Management Permit Application Form, the agent may initial below. If a requirement has not been met, attach justification. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). The forebay volume is approximately equal to 20% of the basin volume. The temporary pool controls runoff from the design storm event. The temporary pool draws down in 2 to 5 days. If required, a 30-foot %egetative filter is provided at the outlet (include non -erosive flow calculations) f. The basin length to width ratio is greater than 3:1. g. The basin side slopes above the permanent pool are no steeper than 3:1. h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). i. Vegetative cover above the permanent pool elevation is specified. j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way150 . I. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. m. A mechanism is specified which will drain the basin for maintenance or an emergency. Hl. NVET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT 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 age) 1104M V does not incorporate a vegetated filter at the outlet. This system (check one) 9edmae 4 does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3 99 Page 2 of 4 Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated 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 as designed. 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. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. g. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact crater quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it gill live an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 2.25 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 2-25 feet in the forebay. the sediment shall be removed. BASIN DIAGRAM fill in the blanks) Permanent Pool Elevation 1 3.8 55 Sediment Re oval El. 11.75 b _ -------------- - Sediment Removal Elevation 11 , 55 75 /° Bottom Eleation 10.8 %----------------------------------------- - ° - Bottom Elevation 10.8 3 25% FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 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. Form S\VU-102 Rev 3.99 Page 3 of 4 7. • All components of the wet detention basin system shall be maintained in good working order. I acknowled_e and agree by my signature below that 1 am responsible for the performance of the seven 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 parry. w 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. L Beth Simmons , a Notary Public for the State of North Carolina County of Craven do hereby certify that James M. Corcoran personally appeared before me this 31 day of July , 2006 , and acknowledee the due execution of the forgoing wet detention basin maintenance requirements. witness my hand and official seal. IWTARY PUBLIC SEAL My commission expires April 22, 2009 Form SWU-102 Rev 3.99 Nee 4 of 4 AVOLIS ENGINEERING, P.A. P.O. Box 15564 • New Bern, North Carolina 28561 • (252) 633-0068 SOIL REPORT Atlantic Beverage, Inc. 1702 Red Robin Lane New Bern, North Carolina A soil boring was conducted on July 31, 2006 in the location of the proposed bio-retention area to be located on the Atlantic Beverage, me. site. The purpose of the boring was to evaluate the suitability of the existing soil material for supporting the function of a bio-retention area. The soil column was observed to exist as follows: DEPTH DESCRIPTION 0 - 10 Inches Topsoil 10 Inches to 18 Inches Tan Sand 18 Inches to 30 Inches Mixed Sand and Clayey Sand 30 Inches to 36 Inches Clayey Sand Mixed with Some Rock 36 Inches to 42 Inches Whitish Sand Groundwater was observed to occur at a depth of 40-inches. Due to existing soil conditions, recommend use sand fill and an underdrain system. Maintain the bio-retention area at as high of an elevation as possible. Permit No. (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM BIORETENTION BASIN SUPPLEMENT DWQ Stormwater Management Plan Review: A complete stormwater management plan submittal includes a stormwater management permit application, an bioretention area supplement for each system, design calculations, soils report and plans and specifications showing all stormwater conveyances and system details. I. PROJECT INFORMATION Project Name : Atlantic Beverage Contact Person: Joseph C. Avolis, P.E. Phone Number:( 252) 633-0068 For projects with multiple basins, specify which basin this worksheet applies to: Bio—Retention Basin II. DESIGN INFORMATION -Attach supporting calculations/documentation. Provide a written soils report Based on actual field investigations conducted by a qualified individual. The soils report should include informational references to the County soils maps when available. All elevations shall be in feet mean sea level (fmsl). Soils Report Summary In -Situ Soil Type Rains In -Situ Soil Infiltration Rate 0.6-2.0 in./hr. (the most restrictive soil layer) SH WT Elevation 3.3 ft. (Seasonal High Water Table elevation) Planting Soil Texture Sandy LoaTmust be a sandy loam, loamy sand, or loam texture) Planting Soil Infiltration Rate 8 in./hr. (estimated) Basin Design Parameters Drainage Area 22,200 sq.ft. (on -site and off -site drainage to the basin) Impervious Area 18,200 sq.ft. (on -site and off -site drainage to the basin) Design Storm 1.0 inch (1.5 inch event for SA waters, I inch event for others) Design Volume 1,562 c.f. (storage volume required) , Inlet Velocity 2 fps Inlet flow depth 9 inch Drawdown Time 2 days Basin Dimensions Basin Size Irreqularft. x ft. — 21083 sq. ft. (surface area at basin bottom) Basin Volume Provided 1 , 562 c.f. Basin Elevations Temporary Pool Elevation 18.2 fmsl (elevation of the bypass/outletstructure) Planting Elevation 17.45 fmsl (elevation of the ground surface bottom) Bottom Elevation 13.45 firs] (elevation of the bottom of the planting media) Pagel of 3 III. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate that the following design requirements have been met and supporting documentation is attached. If requirement has not been met, attach an explanation of why. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. iitials ' - a. No vertical sand bed is proposed. b. The bioretention area is at least 40 feet by 15 feet. c. Sheet flow is provided at inlet. d. A grass buffer strip is provided at the inlet of the bioretention area. e. Seasonal High Water table depth is at least 2 feet from planting surface. f. Ponding depth of 6-9" is provided. g. In -situ soils have a minimum hydraulic conductivity of 0.52 inches per hour and an in-depth soils report is attached. h. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour and the type is noted on plans. i. Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) j. The ponded area will draw down in less than 5 days. (calculations attached) k. A planting schedule with species and densities is provided on plans. I. Mulch layer and depth is specified on plans. in. Plan details for the bioretention area are provided. (including dimensions and elevations) n. Plan details for the inlet and outlet are provided. o. An operation and maintenance agreement signed and notarized by the responsible party is provided. This system (check one) N does ❑ does not incorporate the use of an under -drain. IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT Maintenance activities shall be performed as follows: 1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after every significant runoff producing rainfall event and at least monthly. Remove trash as needed. 2. Repair eroded areas immediately, re -seed and re -mulch as necessary to maintain good vegetative and mulch cover. 3. Remove accumulated sediment and old mulch as needed to maintain good infiltration. Replace, or add additional Page 2 of 3 mulch as needed. Removal of the old mulch layer before applying the new layer is recommended every 2 to 3 years. 4. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in height. 5. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation considered beyond treatment every 6 months. 6. Replace support stakes yearly (in the Spring). Replace deficient stakes or wires whenever needed. 7. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media. Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be removed, disposed of properly and replaced with new planting media. 8. All components of the bioretention area system shall be maintained in good working order. I acknowledge and agree by my signature below that 1 am responsible for the performance of the eight maintenance procedures listed above. l agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: James M. Corcoran Title: President Address: 1702 Red Robin Lane, New BernNC 28562 Phone: (25A 633-1527 Signature: thkey -a' Date 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. 1, Beth Simmons , a Notary Public for the State of North Carolina , County of Craven do hereby certify that James M. Corcoran personally appeared before me this day of (JOJ• 'l , Zc�yo and acknowledge the due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal, NOTARY PUBLIC SEAL My commission expires April 22, 2009 Page 3 of 3 ,,�. �I'�.1.. .. • \� ♦;. ��� .\' � � � ��• r .� ca - Fi.'! . ' . +,. .�� .) ,_ �h 'i ..��..