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HomeMy WebLinkAboutSW8050414_HISTORICAL FILE_20050614STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 0504 14 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS 9Q HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE gc�)5 YYYYMMDD fii AT 6 r ry Y June 14, 2005 Mr. Kirk Andrews, President Footings of Wilmington, Inc. 3129 Braemar Lane Wilmington, NC 28409 Michael F. Easley, Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Subject: Stormwater Permit No. SW8 050414 Andrews Reach High Density Project New Hanover County Dear Mr. Andrews: Alan W. Klimek, P.E. Director Division of Water Quality The Wilmington Regional Office received a complete Stormwater Management Permit Application for Andrews Reach on June 13, 2005. 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. SW8 050414 dated June 14, 2005, for the construction of the subject project. This permit shall be,effective from the date of issuance until June 14, 2015, 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 150E of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. 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 Robert Gordon, or me at (910) 796-7215. Sincerely, Edward Beck Regional Supervisor Surface Water Protection Section ENB/rdg: S:\WQtS\STORMWAT\PERMIT\050414.Jun05 cc: James;Fentress, Jr., PE, Stroud Engineering Tony Roberts, New Hanover County Building Inspections City of., Wilmington Stormwater Services Division of Coastal Management RobertGordon Wilmington Regional Office Central Files North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone (910) 796-7215 Customer Servicel-877.623-6748 One Wilmington Regional Office Wilmington, NO 284053845 FAX (910)350.2004 Internet: h2o,encstate.nc.us NorthCaro/lino An Equal OpportunitylAffirmative Action Employer —50% Recycled110% Post Consumer Paper Alatuml�y State Stormwater Management Systems Permit No. SW8 050414 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 Mr. Kirk Andrews & Footings of Wilmington, Inc. Andrews Reach New Hanover County FOR THE construction, operation and maintenance of an underground infiltration trench 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. i. This permit shalkbe effective from the date of issuance until June 14, 2015, and shall be subject to the following specified conditions and limitations: This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.7 on page 3 of this permit. The stormwater control has been designed to handle the runoff from 339,143 square feet of impervious area. This trench must be operated with a 50' vegetated filter. Detention/storage basins were approved to store runoff prior to discharge to the infiltration,system. These detention/storage structures must each have a 6-inch thick clayJiner. The dewatering orifice must completely dewater each basin after each rainfall. 4. The tract ,will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans. The built -upon area for the future development is limited to 34,000 square feet. Page 2 of 8 State Stormwater Management Systems Permit No. SW8 050414 5. 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 the approved plans. 6. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. 7. The following design criteria have been provided in the infiltration trench and must be maintained at design condition: a. Drainage Area, acres: 17.41 Onsite, ft2: 17.41 Offsite, ft2: 0 b. Total Impervious Surfaces, ft2: 339,143 C. Design Storm, inches: 1.5 d. Trench Dimensions, L x W x H, ft: 1600 x 5 x 4 e. Perforated Pipe Diameter/Length: 36"/1600 f. Bottom Elevation, FMSL: 3 g. Bypass Weir Elevation, FMSL: 6 h. Permitted Storage Volume, ft3: 43,755 (Trench+Storage Basins) i. Type of Soil: Craven, Lakeland, Seagate j. Expected Infiltration Rate, in/hr: 3.75 k. Seasonal High Water Table, FMSL: 1 I. Time to Draw Down, hours: 16.8 M. Receiving Stream/River Basin: Hewletts Creek / Cape Fear n. Stream Index Number: 18-87-26 o. Classification of Water Body: "SA;HQW" II. SCHEDULE OF COMPLIANCE 1. 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 surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. Page 3 of 8 State Stormwater Management Systems Permit No. SW8 050414 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of dewatering orifices, bypass structure, filter media, flow spreader, catch basins, piping and vegetated filter. g. A clear access path to all bypass structures must be available at all times. 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. The facilities shall be constructed as shown on the approved plans. 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 corppletion of construction, prior to issuance of a Certificate of Occupancy, and prior#o 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. Any deviations from the approved"plans and specifications must be noted on the Certification. A modification may be required for those deviations. 7. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 8. Access to the stormwater facilities shall be maintained via appropriate easements at all times. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned.by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. Page 4 of 8 State Stormwater Management Systems Permit No. SW8 050414 10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 11. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 12. 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. III. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, 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. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 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 143-215.6A to 143-215.6C. 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) having 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 permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 6. 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. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sedimenf.,'Control Planning and Design Manual. Approved'plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. Page 5 of 8 State Stormwater Management Systems Permit No. SW8 050414 9. The perm,ittee shall notify the Division any name, ownership or mailing address changes within 30 days. Permit issued this the 14th day of June, 2005. NOR NTAL MANAGEMENT COMMISSION Alan . limek, .E., Director Division of Water Quality By Authority of the Environmental Management Commission Page 6 of 8 State Stormwater Management Systems Permit No. SW8 050414 Andrews Reach Stormwater Permit No. SW8 050414 New Hanover County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (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. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number i' Date SEAL Page 7 of 8 State Stormwater Management Systems Permit No. SW8 050414 Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system 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 system. 5. The bypass structure elevations are per the approved plan. 6. The bypass structure is located per the approved plans. 7. A Trash Rack is provided on the outlet/bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office Ton Roberts, New Hanover County Building Inspections - OFFICE USE ONLY Date Received Fee Paid Permit Number 4/19 05 1$4000.00 2580 SWS 050514/050414 State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT' APPLICATION FORM This form may be photocopied for use as an original 1. CENERAL INFORMATION I, Applicants name (specify the name of the corporation, individual, etc. who owns the project): s of Wilmington, 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Kirk_AtWrews, President 3. Mailing Address for person listed in item 2 above: 3129 Braemar Lane City: Wilmington State: NC Zip: 284Cn Telephone Number: ( 910 j 397-0609 4. Project Name (subdivision, facility, or establishment name -should he consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): 5. Location of Project (street address): Masonboro Loop Road City: Wilmington County: New Hanover 6. Directions to project (from nearest major intersection): From intersection of College Rd & Oleander Dr., East on Oleander., Right on Pi-ne Grove, follow Pine Grove to intersection of Pine Grove and Pasonboro Loop, project on right. 7. Latitude:__2,i3401.1' 4" Longitude:051' 41" of project 8. Contact person who can answer questions about the project: Namc:_jamas H, Fentress. Jr. P.E. Telephone Number: (gio ) 815-0775 IL PERMPPINFORMATiON: I. Specify whether project is (check one): X. New Renewal Modification REC, FTNTF D Faun SWU-101 Version 3.99 Page l of 4 JUN 0 9 Z005 BY;_ If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number 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 Sedimentation/Erosion Control 404/401 Permit _NPDES Stormwater Informadon on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748, Ill. 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 managementfor the project . Rtnrmtaa,ter will he nnller•t-ed—in City Detention Racine and than rpleaspd to flat grade infiltration trenches for treatment. 2. Stormwater runoff from this project drains to the Cape Fear River basin. 3. Total Project Area: 27.3 acres 4. Project Built Upon Area: 35 % 5. I -low many drainage areas does the project have? 6. Complete the following information for each drainage area. If there are more than two drainage areas in the In oject, 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 Bridges Creek �eceiving Stream Class SA Drainage Area 17.41 Existing Impervious* Area —0— Proposed Impervious'Area 7 % Impervious; Area (total) 44 Impervious' Surface Area . Drainage Area I Drainage Area 2 On -site Buildings 206,775 *includes drives, Lot BUA On -she Streets 82,898 and pool/clubhouse area On -site Parking —0_ On -site Sidewalks 15470 Other on -site 34,000 *for Future Development Off' -site Total: 339,143 Total: Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. REA Tr CTD Foun SWU-101 Version 3.99 Page 2 of JUN 1 S 2005 BY; How was the off -site impervious area listed above derived?_ 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 5,000 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 front 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 fonts. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Farm SWU-105 Curb Outlet System Supplement Form SWU-106 Of System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-I08 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 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. Initials • Original and one copy of the Stormwater Management Permit Application Form CIS( • One copy of the applicable Supplement Form(s) for each BMP _ r • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of Stormwater treatment/nianagement • 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): Stroud Engineering, P.A. Mailing Address: 102—D Cinema Drive City: ilmington State: NC.— Zip: 99409 Phone: ( 910 ) 815-0775 Fax: ( 910 ) 815-0593 VIII. APPLICANT'S CERTIFICATION I, (print or type name of person listed in General Information, item 2) M. Kirk Andrews 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 21-1.1000. 1-�? 7 it Date: / / Our— Form SWU-101 Version 3.99 Page of Permit No. 5(0? dSO 4 y (to be provided by DWQ State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM UNDERGROUND INFILTRATION TRENCH SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes a stormwater management permit application, an underground infiltration trench supplement for each system, design calculations, and plans and specifications showing all stormwater conveyances and system details. 1. PROJECT INFORMATION Project Name Andrews Reach Contact Person: James H. Fentress Jr., P. E Phone Number: (910 ) 815-0775 For projects with multiple infiltration systems, a supplement form must be completed for each system. This worksheet applies to: Trench 1 in Drainage Area 1 (frrom plans) (from Form SWU-101) If. DESIGN INFORMATION (attach supporting calculations/documentation): Soils Report Summary (based upon an actual field investigation and soil borings) Soil Type Craven Infiltration Rate 3.75 in/hr or cf/hr/sf (circle appropriate units) SH WT Elevation 1.0 fmsl (Seasonal High Water Table elevation) Trench Design Parameters Design Volume 42,294 c.f. Design Storm 1.5 inch event (1.5 inch event for SA waters, I inch event for others) Drawdown Time 0.7 days Perforated Pipe Size 36 inch diameter Perforated Pipe Length t t;nn R. No. Observation Wells -0- (may be required on a case -by -case basis) Stone Type (if used) #57 Stone Void Ratio 40% Trench Elevations (in feet mean sea level) E2ECETxTT =D Bottom Elevation 3.0 fmsl JUN 1 8 2005 Storage/Overflow Elevation 6.0 fmsl Fonn SWU-107 Rev 3.99 Page I of 4 Trench Dimensions Height 4.0 ft. Length 1600 ft. Width 5.0 ft. Volume Provided 20,166 cu.ft. III. REQUIRED ITEMS CHECKLIST 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 that the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stor ovater Management Permit Application Form, the agent may initial below. Attach justification if a requirement has not been met. Applicants Initials a. System is located 50 feet from class SA waters and 30 feet from other surface waters. b. System is located at least 100 feet from water supply wells. c. Bottom of system is at least 2 feet above the seasonal high water table. d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. e. Off-line system, runoff in excess of the design volume bypasses the system (bypass detail provided). f. System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days based upon infiltration through the bottom only (a hydrogeologic evaluation may be required). g. Soils have a minimum hydraulic conductivity of 0.52 inches per hour. h. System is not sited on or in fill material or DWQ approval has been obtained. i. Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized. j. System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage. k. System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way. 1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas draining to SA waters ). m. Drainage area for the device is less than 5 acres. n. A pretreatment device ( filter strip, grassed Swale, sediment trap, etc.) is provided. U^ 7� o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches. p. Sides of the infiltration trench are lined with geotextile fabric. q. Rock used is free of fines (washed stone) and has a large void ratio. r. Side to bottom area ratio is less than 4:1. Fonn SWIJ-107 Rev 3.99 Page 2 of 4 s. Observation well(s) are provided (case -by -case basis). t. Vegetated fitter is provided for overflow (50 feet for SA waters, 30 feet for other waters) and detail is shown on plans. u. A benchmark for checking sediment accumulation is provided. IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT 1. After every runoff producing rainfall event and at least monthly inspect the bypass/overflow structure for blockage and deterioration and the infiltration system for erosion, trash accumulation, grass cover, and general condition. 2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash and blockages as needed to maintain system performance. 3. Remove accumulated sediment annually or when depth is reduced to 75% of the original design depth. Restore depth to original design depth without over -excavating. Over -excavating may cause the required water table separation to be reduced and may compromise the ability of the system to perform as designed. 4. The water level in any monitoring wells will be recorded after a I inch rainfall event and at least once a month. Chronic high water table elevations (within 1 foot of the bottom of the system for a period of three months) shall be reported to DWQ immediately. 5. If DWQ determines that the system is failing, the system will immediately be repaired or replaced to original design specifications. If the system cannot be repaired to perform its design function, other stormwater control devices as allowed by NCAC 214 .1000 must be designed, approved and constructed. 6. Remove accumulated sediment from the infiltration system annually or when depth in the unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over - excavating. Over -excavating may cause the required water table separation to be reduced and may compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate maamer and shall not be handled in a nnanner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.). A benchmark shall be established in the infiltration system. 'rhe benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the depth at the benchmark reads 3.-75 the accumulated sediment shall be removed from the system. Fonn SWU-107 Rcv 3.99 Page 3 of 4 Iacknowledge and agree by my signature below that I am responsible for maintaining the stormwater collection system in accordance with the six 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. Print Name and Title: Kirk Andrews Address: 3129 Braemar Lane, Wilmington, NC 28405 Phone: (910)397 09 Date: L4 ' G Note: The legally responsible party .should not be a homeowners association unless nmre than 50% of the lots have been sold and a resident of the subdivision has been named the president. I,T,—'1q' -NA./4 r' . :jI TTi-", a Notary Public for the State of IWO9034 (�AIQ.t{.•hN4 County of do hereby certify that y4e-, Arj. ywe--w personally appeared before me this day ofA'lj2.IL 7.00S , and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and official seal, 13. \Ci My commission expires zo-oeo \�.pTAAY pC�g��G Pone SWU-107 Rev 3.99 Page 4 of 4 • 4 1 '/ `: S STROUD ENGINEERING, RA, FACSIMILE TRANSMITTAL Date: 6/ 14/05 Number of Pages 3 To: DWQ From: ZAK SI IIPMAN ATTN: Mr. Rob Gordon Telephone Number: Facsimile Number: E-Mail Address: Telephone Number: 910-815-0775 350-2004 Facsimile Number: 910-815-0593 E-Mail Address: zshipman@stroudengineer.com Reference: Andrews Reach ❑Original will follow via mail Comments: Rob, ■Original will NOT follow via mail Per request. Call me if you have any questions or comments. Thanks, Zak Shipman -Please call if you experience trouble with this transmittal- ■ 102 Suite D Cinema Drive, Wilmington, NC 28403 (910) 815-0775 FAX (910) 815-0593 ■ H9gLTm I ISph5 ,)MI jptl ) STROUD ENGINEERING, P.A. 3961-A Market Street WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 0 1, : rgro i Sn it: I-, L) JOB 404'TJl 0'—. SHEET NO. —1 — CALCULATED BY— 94-"� CHECKED By I . ... .. .. • ........ ............ ... .. 71 OF DATE MONa 2N I (Sqlo SMAs) M5 I (PAod) E. STROUD ENGINEERING, P.A. 102-D Cinema Drive WILMINGTON, NC 28403 (910) 815.0775 TO ( /> JiJ)EAfC_ f�l✓IiioN � V✓ATrl� `"'ua L,I IG44[911� 4LP 4 I�]�Lv]044L^QL� DATE &�i� oS JOB NO. 4� Nw4 ATTEN IOr rr') l�,_1SCPr- CoQOJIJ RE: rew. rod 5IAJB 65041W !"-EVISIJNS WE ARE SENDING YOU ❑ Attached 1 ] Under separate cover via I4AOO DEW"OL the following items: ❑ Shop drawings ❑ Prints ❑ Plans ❑ Samples ❑ Specifications ❑ Copy of letter ❑ Change order ❑ COPIES DATE NO. DESCRIPTION 2 '2£vIS�U pl..p,J <Zrs. I IseD IIJ G�7C.c-c1 olJ — NLr1 �IsrD P . z ZlVU4-,%D CALWLAT,u— I<a THESE ARE TRANSMITTED as checked below: For approval ❑ For your use ? As requested For review and comment ❑ FORBIDS DUE REMARKS r ❑ Approved as submitted ❑ Approved as noted ❑ Returned for corrections ❑ Resubmit copies for approval ❑ Submit copies for distribution ❑ Return corrected prints ❑ PRINTS RETURNED AFTER LOAN TO US p .-sue CVN51DV1-r�wae_os PCIP- rr ISsv..�u¢-. CA, "G w,T+-{ COPY TO SIGNED: If enclosures are not as noted, kindly notify us at once. STROUD ENGINEERING, P.A. CONSULTING ENGINEERS 102-D CINEMA DRIVE WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 June 13, 2005 NCDENR Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Attn: Mr. Robert Gordon Re: Andrews Reach SW8 050414 Dear Mr. Gordon, Please find the enclosed revised plans, application forms, and calculations for the reference project. In response to your letter of June 9, we have made several revisions and are resubmitting for your consideration and approval. I am prepared to address each of your comments as follows below: • All basins are now located in dedicated private drainage easements. • Drainage areas now match in calculations as well as on the application forms. • Outlet structure detail elevations have been corrected. The slot elevations match those used in calculating drawdown volumes for the infiltration trench system. • A trash rack of welded wire mesh has been specified for each drawdown orifice. The wire mesh has opening dimensions of less than '/2" of an inch. • An updated infiltration trench supplement has been included showing the new infiltration volume. Please consider these changes towards the issuance of a State stormwater permit for this project such that we may move towards construction. If you have any questions or additional concerns, don't hesitate to call me at (910) 815-0775 or email at zshipman(n,stroudenRineer.com. Thank you for your timely review and we look forward to hearing from you soon concerning this project. Best Regards, YJ ak Shipman Stroud Engineering, P.A. All:mhments WZShs 107 COMMERCE ST. HESTRON PLAZA TWO SUITE B 102-D CINEMA DRIVE 151-A HWY. 24 GREENVILLE, NC 27858 WILMINGTON, NC 28403 MOREHEAD CITY, NC 28557 (252) 756-9352 (910) 815-0775 (252) 247-7479 STROUD ENGINEERING, P.A. 102-D Cinema Drive WILMINGTON, INC 28403 (910) 815.0775 TO NCDENJf_ "DIyi$104 of W6�E� Z?utau ILCF44G191 OCP DATE JOB NO. ATTf: f101 gLs. Gaol. ..,s RE: .Ltws 1.1 ./Ac PfAmrf ApautdT�/ L_ /(/le-O. FIL.�r�a sib aseg-tY OSU41 ¢ WE ARE SENDING YOU ❑ Attached 110 Under separate cover via 14&Km t�GuJcL the following items: ❑ Shop drawings ❑ Copy of letter ❑ Prints ❑ Plans ❑ Samples ❑ Specifications ❑ Change order ❑ COPIES DATE NO. DESCRIPTION 2 P AIJ SCrY IL-Ove CJJF.N q,JTS 1 ,LATi pwl �,tM � Il.-i�.OT�O1J T{tEN4: SVT?I.E T l CCVER l-ETTZ�L rm-ni%'nc t.l t= ''47 6•e THESE ARE TRANSMITTED as checked below: t For approval ❑ Approved as submitted ❑ Resubmit copies for approval ❑ For your use ❑ Approved as noted ❑ Submit copies for distribution ❑ As requested ❑ Returned for corrections ❑ Return corrected prints IK For review and comment ❑ ❑ FORBIDS DUE ❑ PRINTS RETURNED AFTER LOAN TO US REMARKS 'PILEbw- CONS o15R- Fcxt M.-s%a l.7 A4b TowcQbt f3S.,sN(f. A SYbkyl. Jt- FE'P+�*t' 7i =CAE pgVQ-pPMEs.rT, C��l.. ME Ftfrl4 At•4 /1v6TloNS• 1 COPY SIGNED: /f enclosures ere not as noted, kindly notify us at once. a FOOTINGS OF WILMINGTON, INC. AZALEA TRACE 3129 BRAEMAR LANE WILMINGTON, NC 20409 PAY (� C1/' ". CL!�1� y BRANCH BANKING AND TRUST COMPANY WILMINGTON, NORTH CAROLINA 66-112-531 TORDE THE '//�//�//�� j OF stv 05o41¢ Ycd. NCDENR Stormwater Management Plan For Andrew's Reach .�,55ii it 1 iiiiief June 13, 2005 :��r, CAgo O"e 4� 0..FGSS/p L9'`l`: SEAL c ma's 20043 icy Prepared for: Footings of Wilmington, INC 3129 Braemar Lane Wilmington, NC 28405 Stroud Engineering, P.A. 102-D Cinema Drive Wilmington, NC 28405 ��fIN1IliI �� RECETVrT; JUNK 1 3 200� BY: n G- STROLID ENGINEERING, P.A. 3961-A Market Street WILMINGTOIV, NORTH CAROLINA 28403 (910) 815-0775 SHEET NO. OF CALCULATED BY DATE-�aIL�� CHECKED BY DATE T. I q� ..... ......e......... ... ............ 1 P aUT M 115,N 9nb1 M I (M,d1 STORM DRAINAGE DESIGN SHEET PROJECT: ANDREWS REACH COMPUTED BY: WZS DATE: #'ik LOCATION: WILMINGTON CHECKED BY: SHEET 1 OF 1 FREQUENCY: 10 YR G = 252 H = 30 PIPE TYPE: RCP n: 0.013 CB12 C132 1.05 5 7.23 0.5 3.80 0.7 13.13 15 4.40 CB2 CB1 1.47 2.52 5 7.23 0.5 9.11 0.6 18.76 24 5.58 CB1 FES 0.95 3.91 5 7.23 0.5 14.13 0.4 23.87 24 4.55 CB11 CB4 0.44 5 T23 0.5 1.59 0.4 10.52 15 3.33 CB3 C84 1.28 5 T23 0.5 4.63 0.6 14.55 15 4.08 CB4 FES 0.32 2.04 5 T23 0.5 7.37 0.5 17.93 18 4.20 C89 CB10 0.81 5 T23 0.5 2.93 0.3 13.96 - 15 2.88 CB10 JB 0.70 1.51 5 7.23 0.5 5.46 0.4 16.71 18 3.76 JB CBS 1.51 5 7.23 0.5 5.46 DA 16.71 18 3.76 CB7 CB8 1.09 5 7.23 0.5 3.94 0.4 14.78 15 3.33 CBS C86 0.41 3.01 5 7.23 0.5 10.88 0.3 22.84 24 3.94 CB5 CBS 0.72 5 7.23 0.5 2.60 0A 12.65 15 3.33 C66 FES 0.14 3.87 5 7.23 0.5 13.99 0.5 22.80 24 5.09 CB15 CB16 0.51 5 7.23 0.5 1.84 0A 11.12 15 3.33 CB16 JB 1.09 1.60 5 7.23 0.5 5.78 0.2 19.44 24 3.22 CB13 CB14 0.24 5 7.23 0.5 0.87 0.4 8.38 15 3.33 CB14 C917 0.86 L10 5 7.23 0.5 3.98 0.4 14.83 15 3.33 CB17 JB 0.32 1.42 5 7.23 0.5 5.13 0.3 17.23 18 JB FES 3.02 5 7.23 0.5 10.92 0.3 22.87 24 3.94 CB18 CB19 0.59 5 7.23 0.5 2.13 0.3 12A0 15 2.88 CB19 FES 1.08 1.67 5 7.23 0.5 6.04 0.4 17.35 18 3.76 CB20 CB21 0.76 5 7.23 0.5 2.75 0.3 13.63 15 2.88 C321 FES 0.12 0.88 5 7.23 0.5 3.18 0.3 14A0 15 2.88 OFFSITE JB1 TOJB2 2.54 5 T23 0.5 9.13 0.3 21.43 24 3.94 PROJECT: ANDREWS REACH JOB # PW476 DESIGNED BY: WZS DATE 04/05/05 NCDENR STATE STORMWATER CALCULATIONS SITE SPECIFICS FUTURE DEV. AREA (AC) CITY DET. AREA (AC) TOTAL DRAINAGE AREA 2.1 15.31 17.41 PROP. IMPERVIOUS AREA (AC) 7.78 NOTES: INCLUDES FUTURE DEV. % IMPERVIOUS 0.51 OF 34,000 SF IMPERV. PERVIOUS AREA (AC) 7.53 % PERVIOUS AREA 0.49 STATE TREATMENT FOR FIRST 1.5 OF RAINFALL RUNOFF= 0.05+0.009'%IMPERVIOUS RUNOFF= 0.51 IN REQUIRED TREATMENT VOLUME= 1.5" x RUNOFF x AREA x 43560 SF/AC /12 IN/FT VOLUME= 42294 CF STAGE STORAGE RELATIONSHIP FOR INFILTRATION TRENCH PIPE "USE 36" CPP AT 0% GRADE FOR INFILTRATION DEVICE "TOTAL INFILTRATION LENGTH IS 1600 LF "ASSUME SOILS SUITABLE FOR INFILTRATION (SEE ATTACHED ECS REPORT) #57 STONE VOID RATIO: 40% PIPE DIMENSIONS AND VOLUMES STAGE (FT) PIPE VOLUME (CF) 0 0 0.5 965 1 2943 1.5 5271 2 7643 2.5 9773 3 11210.00 TRENCH VOLUMES: WIDTH LENGTH PIPE VOLUME TRENCH DEPTH TRENCH VOLUME VOIDS VOLUME TOTAL STORAGE CAPACI REQUIRED INFILTRATION VOLUME (CF) 42294 (TRENCH VOL-PIPE VOL) (PIPE VOL+ VOIDS VOL) SOIL INFILTRATION RATE (FROM REPORT)= 3.75 IN/HR TRENCH BOTTOM AREA (SF)= 8000 SOIL ACCEPTANCE RATE (CFS, TOTAL)= 0.69 NOTES: NOT ENOUGH STORAGE FOR SYSTEM, ASSUME STEADY STATE FLOW ALLOW DEWATERING OF CITY DETENTION BASINS BASED ON ALLOWABLE INFILTRATION RATE (0.83/4 SYSTEMS) ALLOWABLE DISCHARGE FROM EACH SYSTEM= 0.17 CFS COMPUTE DEWATERING ORIFICE SIZE FOR EACH BASIN: Q= 0.6'A'(2'G'H)".05 ALLOWABLE Q= 0.17 CFS/BASIN "CONTROL ENTRANCE TO INFILTRATION PIPES VIA SYSTEM OF WEIRS, ORIFICES, AND BOXES "TAKE MAXIMUM DRIVING HEAD AS PIPE DIAMETER (3 FT) "CONTROL PRE AND POST FOR CITY AT BASIN OUTLET STRUCTURES, THIS WILL ALLOW SYSTEM EQUALIZATION IN EVENT OF OVERLOAD. ALLOWABLE DRIVING HEAD (FT7=J AREA (SF)= 0.021 ORIFICE DIAMETER (IN)= 1.95 "POSITION BOXES AS SHOWN ON PLANS AT NODE OF BASIN OUTFALL AND INFILTRATION PIPE COMPUTE DRAWDOWN TIME FOR INFILTRATION DEVICE REQUIRED INFILTRATION VOLUME= 42294 CF ACCEPTANCE RATE (CFS)= 0.69 DRAWDOWN TIME (DAYS)= 0.70 JOB STROUD ENGINEERING, P.A. SHEETNO.J 3961-A Market Street CALCULATED BY WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 CHECKED BY sc.' c OF DATE i ... ... .;..... II'rN.�-Il ,r�,t.'ns.a.ro�J p,��, a:T �Rn\ _......ti5� ��-..nN Srov n,. L... Q✓fa-rra �. .......... �r/Flv:. IX j.�dJ� Sr c�� �ink.� _::X g0 _.. _ .. _ .. ._-......_.. __... �D .,L... I __... - ..�Zf�..._KN--J . .... ......... ........... �> ,.. r..-rrr_ TJA.ovr.✓. T 1. +pass S,.�yTY, �. pR-nv ,D .. . I I....... .... .... `T!•C�ir,.......1 r" I i I I 4, ! I I)y £(�iOr.�.,,.,.S4b�'rS Okn4C MFQ.-ADVI—Tt7D �n,Ll�,. aPJ ,y,.J.n� Dgrr,CjlJ T PC DVIDC GGr DgT3,-!(Ip✓ I ..... ...{�� L. ........ OUELFCcti.1 i�.ol.,, /�T STTi�,F 2•VD - MOM I (snol+ SWe) N51(PadME) JOB�1L)��''�J"�S 1�-S.�ui - YOL �'n1� D�GNjTOfJ STROUD ENGINEERING, P.A. 3961-A Market Street WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 SHEET NO. OF CALCULATED BY WLb DATE CHECKED BY DATE ................... . 17 I W. .. 32 .. .... .............. _.. (21�(v tiDLeen 3-3 %5'AST�J -ot c 5(�( j ...... '41 Ic PRODUCT I IRigbDeets) 205-1)PoEOed) PROJECT: ANDREWS REACH PROJECT#: PW476 DATE: 03/21/05 CITY OF WILMINGTON STORMWATER CALCULATIONS AREA 1 TOTAL DRAINAGE AREA (AC) = 3.44 PROPOSED IMPERV AREA (AC)- 1.50 IMPER AREA= 0.436 PROPOSED PERVIOUS AREA (AC)= 1 1.94 % PERVIOUS= 1 0564 USE PREDEVELOPMENT C = 0.25 USE FULLY DEVELOPED C = 0.95 PROPOSED COMPOSITE "C= F 0.56 INTENSITY WITH 5 MIN Tc 10 YR INTENSITY(IN/HR)= 7.23 50 YR INTENSITY(INIHR)= 8.87 10 YR. PREDEVELOPMENT FLOW Q = CIA C = 0.25 Qpre(CFS) = 6.22 I (IN/HR) = 7.23 A = AREA(AC) = 3.44 10 YR, POST DEVELOPMENT FLOW Q = CIA C = 0.56 Opost(CFS) = 13.8 I (INIHR) = 7.23 A = AREA(AC) = 3.44 50 YR. PREDEVELOPMENT FLOW Q = CIA C = 0.25 Qpre(CFS) = 7.6 I (IN/FIR) = 8.87 A= AREA (AC) 3.44 50 YR, POST DEVELOPMENT FLOW Q = CIA C = 0.56 Qpost(CFS)= 16.9 I(IN/HR)= 8.87 A = AREA(AC) = 3.44 SOIL AS GIVEN BY THE NEW HANOVER COUNTY SOIL SURVEY -CRAVEN, LAKELAND, SEAGATE HYDRAULIC GROUP "B" CURVE NUMBER IMPERVIOUS = 98 OPEN SPACE(75% GRASS)= 61 COMPOSITE CURVE NUMBER (CN) = 98 X (.541)+61 X (.459) S = (1000/CN) -10 = 2.964 PRECIPITATION 10 YR 6 HOUR STORM (IN) = 4.82 PRECIPITATION 50 YR 6 HOUR STORM (IN) = 6.40 10 YR RUNOFF =(P-.2S)"2/(P+.8S)= 2.48 50 YR RUNOFF =(P-.2S)^2/(P+.8S)= 3.84 TIME TO PEAK (Tp) (MIN) _ (43.5 X AREA X RUNOFF)/POST Q 10 YR Tp (MIN) = 26.92 50 YR Tp (MIN) = 1 33.96 REQUIRED STORAGE tOYR STORAGE (CF) _ (Opost - Qpre)Tp X 1.39 X 60 = 50YR STORAGE (CF) _ (Opost - Opre)Tp X 1.39 X 60 = VOLUMES AND DIMENSIONS ABOVE PERMANENT POOL ELEV (FT) SA POND (SF) INCR. VOL (CF; CUM. VOL (CF) 7 489 8 851 670 670 9 1318 1085 1755 10 1855 1587 3342 11 2504 2180 5522 12 3255 2880 8401 TOTAL 8401 CITY POND VOLUMES AND DIMENSIONS ABOVE PERM. POOL ELEV (FT) SA POND (SF) NCR. VOL (CF) CUM. VOL (CF) 7 77 8 238 158 158 9 766 502 660 10 1391 1079 1738 11 2153 1772 3510 12 3091 2622 6132 TOTAL 6132 TOTAL DETENTION VOLUME FOR SYSTEA 14533 TOTAL DETENTION VOLUMES ABOVE PERMANENT POOL ELEV (FT) SA POND (SF) NCR. VOL. (CF CUM. VOL (CF) 7 566 8 1089 828 828 9 2084 1587 2414 10 3247 2666 5080 11 4657 3952 9032 12 6346 5502 14533 TOTAL 145J7 17046 26376 10 YR STORAGE (CF)- 17046 1 NOTES: ASSUME BASINS FILL UNIFORMLY 10 YR. STAGE (FT) 3.46 AND BEHAVE AS ONE POND 10 YR STORAGE ELEVATION = 12.46 DRAWDOWN TIME (2-5 DAY) TOTALSTORAGE= 17046 2 DAY FLOW (CFS)= 0.098647392 5 DAY FLOW (CFS)= 0.039458957 2 DAY AREA (SF)= 0.011019299 5 DAY AREA (SF)= 0.00440772 USE 314 OF AN INCH ORIFICE AT OUTLET STRUCTURE DRAWDOWN FLOW- ORAWDOWN TIME= EMERGENCY SPILLWAY DESIGN Q=3.31-HA3/2 L= 14,52 AREA 2 TOTAL DRAINAGE AREA (AC) _ PROPOSED IMPERV AREA (AC)= % IMPER AREA = PROPOSED PERVIOUS AREA (AC)= % PERVIOUS = USE PREDEVELOPMENT C = USE FULLY DEVELOPED C = PROPOSED COMPOSITE "C= INTENSITY WITH MIN T, 10 YR INTENSITY(IN/HR)= 50 YR INTENSITY(IN/HR)= 0.0274512 7 LIMIT HEIGHT TO 0.5 6.17 2.79 0.452 3.38 0.548 0.25 0.95 0.57 7.23 8.87 DIAMETER (IN)= 1.421751 DIAMETER (IN)= 0.899194 MAKE SPILLWAY 10 FEET LONG 10 YR. PREDEVELOPMENT FLOW Q = CIA C = 0.25 Qpre(CFS) = 11.2 I (IN/HR) = 7.23 A = AREA(AC) = 6.17 10 YR, POST DEVELOPMENT FLOW Q = CIA C = 0.57 Qpost(CFS) = 25.3 I (IN/HR) = 7.23 A = AREA(AC) = 6.17 50 YR. PREDEVELOPMENT FLOW Q = CIA C = 0.25 Qpre(CFS) = 13.7 I (IN/HR) = 8.87 A= AREA (AC) 6.17 50 YR. POST DEVELOPMENT FLOW Q = CIA C = 0.57 Qpost(CFS) = 31.0 I (IN/HR) = 8.87 A = AREA(AC) = 6.17 SOIL AS GIVEN BY THE NEW HANOVER COUNTY SOIL SURVEY - CRAVEN, LAKELAND, SEAGATE HYDRAULIC GROUP "B" CURVE NUMBER IMPERVIOUS = 98 OPEN SPACE (75 % GRASS) = 61 COMPOSITE CURVE NUMBER (CN) = 98 X (.541) +61 X (A59) S = (1000/CN) -10 = 2.865 PRECIPITATION 10 YR 6 HOUR STORM (IN) = 4.82 PRECIPITATION 50 YR 6 HOUR STORM (IN) = 6.40 10 YR RUNOFF =(P -.2S)A2/(P +.8S) = 2.48 50 YR RUNOFF =(P-.2S)A2/(P+.8S)= 3.84 TIME TO PEAK (Tp) (MIN) = (43.5 X AREA X RUNOFF)/POST 0 10 YR Tp (MIN) = 1 26.39 50 YR Tp (MIN) = 1 33.28 ESTIMATED REQUIRED STORAGE 10YR STORAGE (CF) = (Qpost - Qpre)Tp X 1.39 X 60 = 31074 50YR STORAGE (CF) _ (Qpost - Qpre)Tp X 1,39 X 60 = VOLUMES AND DIMENSIONS OF DETENTION DEVICE 48081 ELEV (FT) SA POND (SF) NCR. VOL. (CF CUM VOL (CF) 6 575 7 2326 1451 8 4081 3204 3204 9 5971 5026 8230 10 7926 6949 15178 11 9956 8941 24119 TOTAL 25570 10 YR. STORAGE= 31074 10 YR STAGE (FT)= 5.78 10 YR. ELEVATION (FT)= 11.78 DRAWDOWN TIME (2-5 DAY) TOTALSTORAGE= 31074 2 DAY FLOW (CFS)= 0.179824696 5 DAY FLOW (CFS)= 0.071929879 2 DAY AREA (SF)= 0.020087121 DIAMETER (IN)= S DAY AREA(SF)= 0,008034848 DIAMETER(IN)= USE 1.50 OF AN INCH ORIFICE AT OUTLET STRUCTURE DRAWDOWN FLOW- DRAWDOWN TIME= EMERGENCY SPILLWAY DESIGN Q=3.3LH"3/2 L= 26.57 AREA 3 TOTAL DRAINAGE AREA (AC) _ PROPOSED IMPERV AREA (AC)= % IMPER AREA = PROPOSED PERVIOUS AREA (AC)= % PERVIOUS = USE PREDEVELOPMENT C = USE FULLY DEVELOPED C = PROPOSED COMPOSITE "C'= INTENSITY WIl'115 MIN T� 10 YR INTENSITY(IN/HR)= 50 YR INTENSITY(IN/HR)= 0.098583515 4 LIMIT HEIGHT TO 0.5 2.53 1.16 0.458 1.37 0.542 0.25 0.95 0.57 7.23 8.87 MAKE SPILLWAY 20 FEET LONG 1.919576 1.214046 10 YR. PREDEVELOPMENT FLOW Q = CIA C = G25 Qpre(CFS) = 4.6 I (IN/HR) = 7.23 A = AREA(AC) = 2.53 10 YR. POST DEVELOPMENT FLOW Q = CIA C = 0.57 Qposl(CFS)= 10.4 I(IN/HR)= 7.23 A = ARF-A(AC) = 2.53 50 YR. PREDEVELOPMENT FLOW Q = CIA C = 0,25 Qpre(CFS)= 5.6 I(INIHR)= 8.87 A = AREA (AC) 2,53 50 YR. POST DEVELOPMENT FLOW Q = CIA C = 0.57 Qpost(CFS)= 12.8 I(IN/HR)= 8,87 A = AREA(AC) = 2.53 SOIL AS GIVEN BY THE NEW HANOVER COUN iY SOIL SURVEY- CRAVEN, LAKELAND, SEAGATE HYDRAULIC GROUP "B" CURVE NUMBER IMPERVIOUS = 98 OPEN SPACE (75% GRASS) = 61 COMPOSITE CURVE NUMBER (CN) = 98 X (.541) +61 X (.459) S = (1000/CN) -10 = 2.826 PRECIPITATION 10 YR 6 HOUR STORM (IN) = 4.82 PRECIPITATION 50 YR 6 HOUR STORM (IN) = 6.40 10 YR RUNOFF =(P -.2S)-2/(P +.8S) = 2.48 50 YR RUNOFF =(P-.2S)"2/(P+.8S)= 3.84 TIME TO PEAK (Tp) (MIN) = (43.5 X AREA X RUNOFF)/POST Q 10 YR Tp (MIN) = 26.18 50 YR Tp (MIN) 1 33.02 REQUIRED STORAGE 10YR STORAGE (CF) = (Qpost - Qpre)Tp X 1.39 X 60 = 12820 50YR STORAGE (CF) = (Opost - Qpre)Tp X 1.39 X 60 = 19836 VOLUMES AND DIMENSIONS OF DETENTION DEVICE: ELEV (FT) SA POND (SF) NCR. VOL. (CF CUM VOL (CF) 8 837 9 1278 1058 1058 10 1963 1621 2678 11 2801 2382 5060 12 3756 3279 8339 13 4755 4256 12594 TOTAL 12594 10 YR. STORAGE= 1 12820 10 YR STAGE (FT)= i 5.05 10 YR. ELEVATION (FT)= 13.05 DRAWDOWN TIME (2-5 DAY) TOTALSTORAGE= 12820 2 DAY FLOW (CFS)= 0.074187415 5 DAY FLOW (CFS)= 0.029674966 2 DAY AREA (SF)= 0.008287024 DIAMETER (IN)= 5 DAY AREA (SF)= 0.00331481 DIAMETER (IN)= USE 1 INCH ORIFICE AT OUTLET STRUCTURE DRAWDOWNFLOW- DRAWDOWN TIME= EMERGENCY SPILLWAY DESIGN 0=3.31-W3/2 L= 10.98 AREA 4 TOTAL DRAINAGE AREA (AC) _ PROPOSED IMPERV AREA (AC)= IMPER AREA= PROPOSED PERVIOUS AREA (AC)= PERVIOUS = USE PREDEVELOPMENT C = USE FULLY DEVELOPED C = PROPOSED COMPOSITE "C"= INTENSITY WITH 5 MIN T, 10 YR INTENSITY(IN/HR)= 50 YR INTENSITY(IN/HR)= 0.059003319 3 LIMIT HEIGHT TO 0.5 3.18 1.39 0.437 79 0.563 0.25 0.95 0.56 7.23 8.87 MAKE SPILLWAY 15 FEET LONG 1.232951 0.779786 10 YR. PREDEVELOPMENT FLOW Q = CIA C = 0.25 Qpre(CFS) = 5.7 I (INIHR) = 7.23 A = AREA(AC) - 3.18 10 YR. POST DEVELOPMENT FLOW Q = CIA C = 0.56 Qpost(CFS) = 12.8 I (IN/HR) = 7.23 A = AREA(AC) • 3.18 50 YR. PREDEVELOPMENT FLOW Q = CIA C = 0.25 Qpre(CFS) = 7.1 I (INIHR) = 8.87 A= AREA (AC) 3.18 50 YR, POST DEVELOPMENT FLOW Q = CIA C = 0.56 Opost(CFS) = 15.7 I (IN/HR) = 8.87 A = AREA(AC) - 3.18 SOIL AS GIVEN BY THE NEW HANOVER COUNTY SOIL SURVEY- CRAVEN, LAKELAND, SEAGATE HYDRAULIC GROUP"B" CURVE NUMBER IMPERVIOUS = 98 OPEN SPACE (75% GRASS) = 61 COMPOSITE CURVE NUMBER (CN) = 98 X (.541) +61 X (.459) = 7Z 17 S = (1000/CN) -10 = 2.958 PRECIPITATION 10 YR 6 HOUR STORM (IN) = 4.82 PRECIPITATION 50 YR 6 HOUR STORM (IN) = 6.40 10 YR RUNOFF =(P - .2S)"2/(P +.8S) = 2.48 50 YR RUNOFF =(P - .25)^2/(P +.8S) = 3.84 TIME TO PEAK (Tp) (MIN) = (43.5 X AREA X RUNOFF)/POST Q 10 YR TIP (MIN) - 26.89 50 YR TIP (NIZ 33.91 REQUIRED STORAGE 10YR STORAGE (CF) = (Qpost - Qpre)Tp X 1.39 X 60 = 15775 50YR STORAGE (CF) = (Qpost - Opre)Tp X 1.39 X 60 = 24409 VOLUMES AND DIMENSIONS OF DETENTION DEVICE: ELEV (FT) SA POND (SF) NCR. VOL. (CF CUM VOL (CF) 4 1286 5 2156 1721 1721 6 3248 2702 4423 7 4486 3867 8290 8 5927 5207 13497 TOTAL 13497 10 YR, STORAGE= 15775 10 YR STAGE (FT)= 4.44 10 YR. ELEVATION (PT)= 8.44 11 DRAWDOWN TIME (2-5 DAY) TOTALSTORAGE= 15775 2 DAY FLOW (CFS)= 0.091291204 5 DAY FLOW (CFS)= 0.036516482 2 DAY AREA (SF)= 0.010197584 DIAMETER (IN)= 5 DAY AREA (SF)= 0,004079034 DIAMETER (IN)= USE 1.25 INCH ORIFICE AT OUTLET STRUCTURE DRAWDOWN FLOW- 0.086396839 DRAWDOWN TIME= 2 EMERGENCY SPILLWAY DESIGN 0=3.31-W3/2 LIMIT HEIGHT TO 0.5 L= 13.44 MAKE SPILLWAY 15 FEET LONG 1.367713 0.865018 PROJEC')': ANDREIVS REACII POND 1 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH Op= 13.8 cfs Tp = 26.92 min Time min Inflow cfs 0 0 2.692 0.337 5,384 1.316 8.078 2,842 10,768 4.764 13.460 6.895 16.152 9.026 18.844 10.949 21.536 12.477 24,228 13.459 26.920 33.800 29.612 13.466 32,304 12.490 34.996 11,051 37.688 9.704 40.380 8.521 43.072 7.482 45.764 6.570 48.456 5.769 51,148 5.066 53.840 4.448 56.532 3.906 59.224 3.430 61.916 3.012 64.608 2.645 67.300 2.322 69.992 2.039 72.664 1.791 75.376 1.572 78.068 1.381 80.760 1.212 DATE: MARCH 21. 2005 Inflow (cfs) 16 14 12 u10 y _ 1'• 7 e � �• - � iF� • Inflow (cfs) c fif ♦ •t. a:�, AWNS 0 20 40 60 80 100 time (minute) PROJECT: ANDREWS REACH 110ND 1 DATE: MARCH 21, 2005 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Inc. Volume Acc. Vol. Sta e S Z 7 568 0 0 0 0 0 8 1089 828 828 1 828 1 9 2084 1587 2414 2 2414 2 10 3247 2666 5080 3 5080 3 11 4657 3962 9032 4 9032 4 12 6346 5502 14533 5 14533 5 Ks = 827.5 b = 1.780601833 STAGE -STORAGE CURVE 3.5 3 2.5 w 2 • STORAGE 1.5 —Poly. (STORAGE) y 1 K PROJECT: ANDREWS RCACII POND 1 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 3 OF 3 10 YR STORM ROUTING ORIFICE (IN) = 0.75 ORIFICE AREA (SO. FT.) = 0,003 WEIR LENGTH (FT) = 1.50 WEIR HEIGHT (FT) 0.50 WEIR AREA (SF)= 0.75 TIME INFLOW STORAGE STAGE OUTFLOW 0.000 0.000 0.00 0.00 0.00 2,692 0.337 _ 0.00 0.00 0,00 5.384 1.316 54.49 0.22 0.01 8.076 2,842 266.19 0.53 0.01 10,768 4.764 723.54 0.93 0.01 13.460 6.895 1490,74 1.39 0.02 16.152 9.026 2601.59 1.90 0.02 18,844 10.949 4056, 22 2.44 2.42 2L536 12.477 5433,41 2.88 3.41 24,228 13.4591 6898,33 3.29 4.13 26.920 13,8001 8405,43 3.66 4,70 29.612 13.4661 9874.65 4.02 5.17 32.304 12.4901 11215,00 4.32 5.93 34,996 11.0511 12338,50 4.56 5.81 37.588 9.7041 13185.03 4.73 6.00 40.380 8.5211 13782.82 4.85 6.13 43.072 7.4821 14168.64 4.93 6.21 45.764 6.5701 14373,63 4.97 6.26 48.456 5.7691 14424.49 4,98 6,27 51.148 5.066 14344.31 4.96 6.25 53.840 4.448 14153.17 4.93 6.21 56.532 3,906 13868.64 4.87 6,15 59.224 3.430 13506.12 4.80 6.07 61.916 3.012 13079A8 4.71 5,98 04.608 2.645 12599.83 4.61 5,87 07.300 2,322 12078.71 4.51 5.75 69.992 2.039 11525.29 4.39 5.61 72,684 1.791 10948.05 4.26 5,46 75.376 1.572 10354.60 4.13 5.30 78.068 1.381 9751.83 4.00 5.13 80.760 1.212 9145.96 3.85 4.95 83.452 1.065 8542.72 3.71 4.75 88.144 0.935 7947.36 3.56 4.54 88.636 0,821 7364.77 3.41 4.32 91.528 0.721 6799.54 3.26 4.09 94.220 0.633 6255.99 3.11 3.84 96.912 0.556 5738.27 2.97 3,58 99,604 0.486 5250.38 2.82 3,30 102.296 0.429 4796.22 2.68 3,01 104.9BB 0.376 4379.61 2.55 2,70 DATE: MARCH 21, 2005 THRESHOLDSTAGES ORIFICE 1 0,0625 ORIFICE 2 2.00 OVERFLOW 5 INFLOW VS OUTFLOW iscoo 61 u ♦INFLOW ■ OUTFLOW LL 2.000 0.000 0.000 20.000 40.000 60.000 80.000 100.000 TIME (MIN) 4.699. 2 000 � •�W�a�q+b� 0,000 Nd'2 8.000 s.0oo t "1'rk� • �� ` PROJECII': ANDREWS REACll POND 2 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH O p = 25.3 cfs Tin = 26.39 min Time min In60W cfs 0 0 2.639 0,619 5.278 2,414 7.917 5, 210 10.556 8.733 13,195 12.640 15.834 16.548 18A73 20,074 21.112 22.875 23.751 24.675 26,390 25.300 29.029 24,688 31,668 22.898 34.307 20.261 36,946 17.791 39.585 15.622 42.224 13.718 44.863 12.045 47.502 10.577 50.141 9.288 52.780 8.155 55,419 7.161 58.058 6,288 60.697 5,522 63.336 4,849 65.975 4,257 68.614 3,738 71.253 73.892 2,883 2.BB3 76.531 2.531 79.170 2.223 DATE: MARCH 21, 2005 Inflow (cfs) 30 25' 42 15 ,g � rt��. � •Inflow (cfs) 0 0 20 40 60 80 100 time (minute) PROTECT: ANDREWS REACH POND 2 DATE: MARCH 21, 2005 PROJECT NO.. PW-475 10 YR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Inc. Volume Acc. Vol Stage S Z 6 575 0 0 0 0 0 7 2326 1451 1451 1 1451 1 8 4081 3204 4654 2 4654 2 9 5971 5026 9680 3 9680 3 10 7926 6949 16629 4 16629 4 11 9956 8941 25570 5 25570 5 Ks = 1450.5 b = 1.782915568 STAGE -STORAGE CURVE 3.5 &3ytyyy,y - fi B..' 2.5 v' 9,..., _ � w 2 - ,1, • STORAGE 1.5. —Poly. (STORAGE) n 1 0 0 2000 4000 6000 8000 10000 12000 STORAGE (CF) PROJECT: ANDREWS 1tEAC13 POND 2 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 3 OF 3 10 YR STORM ROUTING ORIFICE (IN) = 1,50 ORIFICE AREA (SQ. FT.) = 0.012 WEIR LENGTH (FT) = 1.50 WEIR HEIGHT (FT) = 0.75 WEIR AREA (SF) = 1.13 TIME INFLOW STORAGE STAGE OUTFLOW 0.000 0.000 0.00 0,00 0.00 2.639 0.619 _ 0.00 0.00 0.00 5.278 2,414 97.94 0,22 0.02 7.917 5.210 _ 477.21 0.54 0,04 10.556 8.733 1296.10 0.94 0,05 13.195 12,640 2670.49 1,41 2.22 15.834 66. 548 3320.12 1.84 4.25 18.473 20.074 6266.75 2.27 5.56 21.112 22.875 8564.38 2.71 6.63 23.751 24,675 11135,90 3.14 7.54 26.390 25.300 13848.57 3,541 8.32 29.029 24.688 16537.95 3.921 8.96 31.668 22,898 19028.37 4.241 9.48 34.307 20.261 21152.89 4.50 9.88 36,946 17.791 22796.21 4,69 10.17 39.585 15.622 24002.83 4.83 10.37 42.224 13.718 24834.23 4.92 10.50 44.063 12.045 25342.93 4.98 10.58 47.502 10.577 25574.17 5.00 10,62 50.141 9.2881 25567.17 5.00 10.62 52,780 8.155 25356.23 4.98 10.59 55,419 7.161 24971.21 4.93 10.53 58.058 6,288 24438,33 4.871 10.44 60.697 5.522 23780,67 4.801 10,33 63.336 4,849 23018,54 4.711 10.21 65.975 4.257 22169.93 4.62 10.06 68,614 3.738 21250,75 4.51 9.90 71,253 3.283 20275,16 4.391 9.72 73.892 2.883 19255.79 4.261 9,53 76,531 2.531 18203.95 4.131 9.31 79.170 2.2231 17129,81 3,991 9.09 81.809 1.9521 16042.58 3.85 8.85 84.448 1.714 14950.63 3.70 8.59 87.087 1.505 13861.67 3,55 8.32 89,726 1.321 12782.79 3,39 8.03 92.365 1.160 11720.65 3.23 7.72 95.004 1.019 10681.54 3.06 7.40 97.643 0.895 9671.49 2.90 7.05 100.282 0.786 8696.38 2.73 6.69 102.921 0.690 7762.01 2.56 6.30 DATE: MARCH 21, 2005 THRESHOLD STAGES ORIFICE 1 0.125 ORIFICE 2 1.25 OVERFLOW 5 INFLOW VS OUTFLOW 30.000 25,000 20,000 Ufg.INFLOW • OUTFLOW 10.000 ine 20.000 40,000 60.000 80.000 100,000 0.000 TIME (MIN) • t �,o t �• • ti9' PItOJ1:C"1': ANIMMS I FACII POND 3 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH Op= 10.4 cfs Tp= 26.18 min Time min Inflow cfs 0 0 2,618 0.254 5.236 0.992 7.854 2,142 10.472 3.590 13.090 5.196 15.708 6.802 18.326 8.252 20.944 9.403 23.562 10.143 26.186 10,400 28.798 10.148 31.416 9.413 34,034 8.328 36.652 7.313 39.270 6.422 41.888 5.639 44.506 4.951 47.124 4.348 49.742 3.818 52..360 3,352 54,978 2,944 57,596 2.585 60.214 2.270 62.832 1.993 65.450 1.750 68.068 1.537 70.686 1.349 73.304 1.185 75.9221 1.040 78.5401 0.914 DATE: MARCH 21, 2005 Inflow(cfs) 12 10 - •••- 8'r q 6 ' • F. Inflow (cfs) 4 • 2 _ •'. • ••4• . 0 0 20 40 60 80 100 time (minute) I'ROJI er: ANDREWS REAC11 POND 3 DATE: MARCH 21, 2005 PROJECT NO.: PW.476 10 VR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Inc. Volume Acc. Vol. Stage S Z 8 837 0 0 0 0 0 9 1278 1058 1058 1 1058 1 10 1963 1621 2678 2 2678 2 11 2801 2382 5060 3 5060 3 12 3756 3279 8339 4 8339 4 13 4755 4256 12594 5 12594 5 Ks = 1057.5 b = 1.539241035 STAGE -STORAGE CURVE 3.5 3 i 2.5 STORAGE 1.5 "'•'Y.'.i , P Iy.ORAGE) 0.5 �''.'< H' "• �x�r,."�. ,SKr `'".,"k=.h 5'h 0 0 1000 2000 3000 4000 5000 6000 STORAGE(CF) PR0.116CT: ANDREWS REAC71 POND 3 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 3 OF 3 10 YR STORM ROUTING ORIFICE (IN) = 1.00 ORIFICE AREA (SQ. FT.) = 0.005 WEIR LENGTH (FT) = 1.35 WEIR HEIGHT (FT) 0.50 WEIR AREA (SF)= 0.68 TIME INFLOW STORAGE STAGE OUTFLOW 0.000 0.000 0,00 0.00 o.00 2.618 0.254 0.00 o.o0 0.00 5,236 0.992 39.94 0.12 0.00 7.854 2.142 195.00 0.33 0,01 10,472 3.590 529.33 0.64 0,02 13.090 5.196 1090.17 1.02 0.03 15,708 6.802 1902.34 1.46 0.03 18.326 8,252 2965.98 1,95 0,04 20.944 9,403 4256.53 2,47 0.04 23.562 10.143 5727.17 3.00 0.04 26, 180 10,400 7313.42 3.51 2.38 28.798 10.148 8573.92 3.89 3.13 31.416 9.413 9677.04 4.21 3.63 34.034 8,328 10584.83 4.47 3.99 36.652 7.313 11266.26 4.65 4.23 39.270 6.422 11750.24 4.78 4,39 41,888 5.639 12068.94 4,86 4,49 44.506 4.951 12248.74 4.91 4.55 47.124 4,348 12311.79 4,93 4.57 49,742 3.818 12276.99 4.92 4.56 52.360 3.352 12160.61 4.89 4.52 54.978 2.944 11976.77 4.84 4,47 57.596 2.585 11737.77 4.78 4.39 60,214 2,270 11454.42 4,70 4.30 62.832 1,993 11136.21 4,62 4,19 65.450 1.750 10791,52 4.52 4.07 68.068 1.537 10427,78 4.42 3.93 70.686 1.349 10051. 8 -4.32 3,79 73,304 1.185 9668.80 4.21 3.63 75.922 1.040 9284.72 4.10 3,46 78.540 0.914 8904.04 3.99 3,29 81,168 0.802 8531.03 3.88 3,10 83,776 0.704 8169.51 3.77 2.91 86,394 0.619 7822.97 3.67 2.71 89,012 0.543 7494.55 3.57 2.50 91.630 0.477 7187.14 3.47 2.28 94.248 0A19 6903.35 3,38 2.06 90.866 0.368 6645.56 3.30 1,83 09.494 0.323 6416.01 3.23 1.59 102.1021 0,2841 6216.65 3.16 1.35 DATE: MARCH 21, 2005 THRESHOLD STAGES ORIFICE 1 0.083333 ORIFICE 2 3.00 OVERFLOW 5 INFLOW VS OUTFLOW 12.000 10.000 8.000 LL • INFLOW p IN OUTFLOW2.000 4.000 4.000 0.000 PROJECT: ANIIREWS REACII IIONU 4 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH O p = 12.8 cis Tp = 26.89 min Time min Inflow cfs 0 0 2.689 0.313 5.378 1.221 8.067 2.636 10,756 4.418 13.445 6.395 16.134 8.372 18.823 10.156 21.512 11.573 24.201 12,484 26,890 12.800 29.579 12.490 32.268 11.585 34.957 10.250 37.646 9.001 40.335 7.904 43.024 6.940 45,713 6 094 48.402 5.351 51,091 4,699 53.780 4.126 56.469 3.623 59.158 3.181 61.847 2.794 64,536 2,453 67.225 2.154 69.914 1.891 72.603 661 1�1281 75.292 77.981 80.670 DATE: MARCH 21, 2005 Inflow (cis) 14 12- 10 ♦Inflow (cfs) 0 6 4 . 2 ! PROJECT: ANDREWS REACII POND 4 DATE: MARCH 21, 2005 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Inc. Volume Acc. Vol. Stage S 2 4 1286 0 0 0 0 0 5 _ 2156 1721 1721 1 1721 1 6 3248 2702 4423 2 4423 2 7 4485 3867 8290 3 8290 3 8 5927 5207 13497 4 13497 4 Ks = 1721 b = 1.485633162 STAGE -STORAGE CURVE 3.5 ., 3 C 2.5 2 w 6 <� ♦ STORAGE 1.5le ,y� —Poly. (STORAGE) 0.5 R2 (F.9 0 0 2000 4000 6000 8000 10000 STORAGE(CF) 1%0,IEC7'; ANDREWS REACII POND 4 PROJECT NO.: PW-476 10 YR STORM ROUTING SHEET 3 OF 3 10 YR STORM ROUTING ORIFICE (IN) = 1.25 ORIFICE AREA(SQ. FT.) = 0.009 WEIR LENGTH (FT) = 1.35 WEIR HEIGHT (FT) = 0.50 WEIR AREA (SF)= 0.68 TIME INFLOW STORAGE STAGE OUTFLOW 0.000 0.000 0.00 0.00 0.00 2.689 0,313 0.00 0.00 0.00 5.378 1.221 50.49 0.09 0.00 8.067 2,636 247.50 0.27 0.02 10.756 4.418 670.04 0.53 0.03 13.445 6.395 1378.58 0.86 0.04 16.134 8.372 2404.58 1.25 1.68 18, B23 10.156 3484.71 1.61 2.58 21.512 11.573 4706.35 1.97 3.25 24.2011 12.4841 6048.51 2.33 3.81 26.890 12,800 7447.98 2.68 4.28 29.579 12.490 8822.65 3.00 4.67 32.268 11.585 10084.11 3.29 4.99 34.957 10,250 11148.34 3.52 5.23 37.646 9.001 11957.97 3.69 5.41 40.335 7.904 12538,08 3.81 5.52 43,024 6.940 12922. 04 3.88 5.60 45.713 6,094 13138.29 3.93 5.64 48.402 5.351 13211.26 3.94 5.66 51.091 4,699 13162.09 3.93 5.65 53.780 4.1261 13009.21 3.90 5.62 56.469 3,623 12768.69 3,85 5.57 59.158 3,181 12454.63 3.79 5.51 61,847 2.794 12079.42 3,71 5.43 64,536 2,453 11653.98 3.62 5.34 67,225 2.154 11187.96 3.53 5.24 69.914 1.891 10689.91 3.42 5.13 72,603 1,661 10167.44 3,31 5.01 75.292 1.458 9627.32 3A9 4.88 77,981 1.281 9075.63 3.06 4.74 80,670 1.124 8517.81 2.93 4.59 83.359 0.9871 7958.80 2.80 4.43 86,048 0.867 7403.07 2.67 4.27 88.737 0.761 6854.72 2.54 4.09 91.426 0.669 6317.52 2.40 3.91 94.115 0.587 5794.98 2.26 3.71 96,804 0.515 5290.37 2.13 3.51 99.493 0.453 4806.82 2.00 3.30 102.182 0.397 4347.30 1.87 3.08 104.871 0.349 3914.69 1.74 2.85 DATE: MARCH 21, 2005 THRESHOLD STAGES ORIFICE 1 0.104167 ORIFICE 2 1.00 OVERFLOW 4 INFLOW VS OUTFLOW 14.000 12.000 U 000 ♦INFLOW p In OUTFLOW2,000 4.000 PROJECT: ANDREWS REACH POND] PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH Q p = 16.9 cfs Tp = 33.96 min Time min Inflow cfs 0 0 3.396 0,413 6.792 1,612 10.188 3.480 13.584 5.834 16.980 8.443 20,376 11.054 23.772 13.409 27.168 15.280 30.564 16.483 33.960 16.900 37,358 16.491 40.752 15.296 44.148 13.534 47.544 11.884 50.940 00.435 54.336 9.163 57.732 8.046 61,128 7.065 64.524 6,204 67.920 5,448 71.316 4,784 74.712 4.200 78,108 3,688 81,504 3.239 84.900 2,844 88.296 2.497 91,692 2.193 95.088 1.926 98.484 1.691 101.880 1,485 DATE: MARCH 21, 2005 Inflow(cfs) 18 16 14 12 u now PROJECT: ANDREWS REACI1 POND 1 DATE: MARCH 21, 2005 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Irc. Volume Acc Vol. Stage S Iz 7 566 0 0 0 01 0 8 1089 828 828 1 828 1 9 2084 1587 2414 2 2414 2 10 3247 2666 5080 3 5080 3 11 4657 3952 9032 4 9032 4 12 6346 5502 14533 5 14533 5 Ks = 827.5 b = 1.780601833 STAGE -STORAGE CURVE 3.5 3 2.5 -- 2 ♦ STORAGE 1.5 ' - —Poly. (STORAGE) 1 J' ♦.i. �z y- rE- i3e 0.5 — :R� 09941".;r� 6 0 1000 2000 3000 4000 5000 6000 STORAGE(CF) PROJECT: ANDREWS ILEACII 110ND 1 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 3 OF 3 50 YR STORM ROUTING ORIFICE (IN) = 0.75 ORIFICE AREA (SQ. FT,) = 0,003 WEIR LENGTH (FT) = 1.50 WEIR HEIGHT (FT) = 0.50 WEIR AREA (SF)= 0.75 TIME INFLOW ISTORAGE STAGE OUTFLOW 0.000 0.000 0.00 0.00 0.00 3.395 0.413 0,00 0.00 0.00 6.792 1.612 84.18 0.28 0.01 10.188 3,480 411.30 0.68 0.01 13,584 5.834 1118.02 1.18 0.02 16.980 8,443 2303.50 1,78 0.02 20.376 11.054 4019.96 2,43 2.39 23.772 13A09 5785.36 2.98 3.60 27.168 15.280 7783.79 3.52 4,48 30.564 16.483 9984!091 4.05 5.20 33.960 16.900 12283.18 4.55 5.80 37.356 16.491 14545.48 5.00 6.29 40.752 55,296 16623,42 5.39 12.57 44,148 33.534 17177.80 5.49 15.07 47.544 11.884 16864.48 5.44 13.63 60.940 10,435 165 8,339 5.37 12.09 54.338 9.163 16171.70 5.31 10.73 57.732 8.046 15852.55 5.25 9.55 81.128 7.065 15546.99 5.19 8,52 64.524 6.204 iszs0.24 5.14 7.65 67.920 5,448 14955.99 5,08 6.93 71.3T8 4,784 14654.46 5.02 6.40 74.712 4.200 14325.47 4.96 6.25 78.108 3.688 13908.78 4.88 6.16 81.504 3.239 13405.36 4.78 6.05 84,900 2.844 12832.27 4.66 5.92 88.296 2.497 12204.65 4.53 5.78 91.692 2.193 11536.04 4.39 5.62 95.088 1.926 10838.601 4.24 5.44 98.484 1.691 1 0123.351 4,08 5.24 101.8B0 1.465 9400.32 3.91 5.03 105.276 1.3041 8678.73 3.74 4.80 108.672 1,145 7967.12 3.57 4,55 112.068 1.005 7273.49 3.39 4,28 115.464 0.883 6605.44 3,21 4.00 118.860 0.775 5970.19 3,03 3.70 122,256 0.681 5374.78 2.86 3.37 125.652 0.598 4826.07 2,69 3.03 129.048 0,525 4330.80 2,53 2,66 132.444 0.461 3895.65 2.39 2.27 DATE: MARCH 21, 2006 THRESHOLDSTAGES ORIFICE 1 0.0625 ORIFICE 2 2.00 OVERFLOW 5 INFLOW VS OUTFLOW 18.000 LL U 16.000 PRO.IECF: ANDREWS REACII POND 2 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH O p = 31.2 cfs Tp = 33.58 min Time min Inflow cfs 0 0 3.358 0.763 6,716 2.976 10,074 6A25 13.432 10.770 16.790 15.588 20.148 20.406 23.506 24.755 26.864 28.209 30.222 30.430 33.580 31.200 36.938 30.445 40.296 28.238 43.654 24.985 47.012 21.940 50,370 19.265 53,728 16.917 57.086 14.854 60,444 13.044 63.802 11,453 67.160 10.057 70.518 8.831 73.876 7.755 77.234 6.809 80.592 5.979 83.950 5.250 87.308 4.610 90,666 4.048 94.024 3.555 97.382 3.121 100.740 2.741 DATE: MARCH 21, 2005 Inflow (cfs) 35 30 25 p 15 ♦Inflow (cfs) 0 lu 5 0 0 20 40 60 80 100 120 time (minute) • y 1. PROJECT: ANDREWS RE.ACII POND 2 DATE: MARCH 21, 2005 PROJECrNO.: PW-476 50 YR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Inc. Volume Acc. Vol. Stage S Z 6 575 0 0 0 0 0 7 2326 1451 1451 1 1451 1 8 4081 3204 4554 2 4654 2 9 5971 5026 9680 3 9680 3 10 7926 6949 16629 4 16629 4 11 9956 8941 25570 5 25570 5 Ks = 1506.163053 b = 1.759517917 STAGE -STORAGE CURVE 3.5 - 3- 2.5 u1 2 • STORAGE „ _ a 1.5 —Poly. (STORAGE) 1 0.5 R�-e 0.98g i 0 0 2000 4000 6000 8000 10000 12000 STORAGE (CF) PROJECT: ANDREMS REACI1 POND 2 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 3 OF 3 50 YR STORM ROUTING 1.50 ORIFICE AREA (SO. FT.) = 0.012 WEIR LENGTH (FT) = 1.50 WEIR HEIGHT (FT) = 0.75 WEIR AREA (SF) = 1.13 TIME INFLOW STORAGE STAGE OUTFLOW 0,000 0,000 0.00 0.00 0.00 3,358 0.763 0.00 0.00 0.00 6,716 2.976 153,68 0.27 0.02 10,074 6.425 748.78 0.67 0,04 13,432 10.770 2034.39 1.19 0.06 16.790 15.588 4192,04 1.79 4.05 20.148 20.406 6515.87 2.30 5.63 23.506 24.755 9492.06 2.85 6.94 26.864 28,209 13080.94 3.42 8.08 30.222 30,430 17136.60 3,98 9.07 33,580 31.200 21439.96 4.52 9.92 36.938 30.445 25726.48 5,02 10.70 40.296 28.238 29704.70 5.44 18.35 43.654 24.985 31697.64 5.65 24.06 47,012 21.940 31884.33 5.67 24.64 50.370 19.265 31341.21 5.61 22.98 53,728 16,917 30593.45 5.54 2076. 57,086 14.854 29813,48 5.46 18.64 60.444 13.044 29051.70 5.381 16.68 63.802 11,453 28319.23 5.30 14.95 67.160 10.057 27613.77 5.22 13.47 70.518 8.831 26927.08 5.15 12.21 73.876 7.755 26245.97 5.07 11.22 77.234 6.809 25548.63 5.00 10.62 80.592 5.979 24781.49 4.91 10A9 83.950 5.250 23871.67 4.81 10.35 87.308 4.610 22844.95 4.69 10.17 90.666 4.048 21724.21 4.56 9.98 94.024 3.555 20529.89 4.41 9.76 97.382 3.121 19280.27 4.26 9.52 100.740 2.741 17991.87 4.09 9.25 104.098 2.407 16679.65 3.92 8,97 107.456 2,113 15357.31 3.74 8.66 110.814 1.856 14037.51 3.56 8,34 114.172 1.630 12732.04 3.36 7.98 117.530 1.431 11452.08 3.17 7.60 120.688 1.256 10208.33 2.97 7.20 124.245 1.103 9011.27 2.76 6.76 127.604 0.969 7871.30 2.56 6.29 130.962 0.851 6796.97 2.36 5.78 DATE: MARCH 21, 2005 THRESHOLDSTAGES ORIFICE 1 0,125 ORIFICE 2 1.25 OVERFLOW 5 INFLOW VS OUTFLOW 35.000 LL20000 • 30.000 25.000 PROJECT: ANDREWS REACIf POND 3 PROJECT NO,: PW-476 50 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH Op= 12.8 cis Tp= 33.02 min Time min Inflowlots) 0 0 3,302 0.313 6.604 1.221 0.906 2.636 13.208 4.418 16,510 6,395 19,812 8,372 23, 114 10.156 26.416 11.573 29.718 12.484 33,020 12.800 36,322 12.490 39.624 11.565 42.926 10.250 46228 9.001 49, 530 7.904 52.832 6.940 56,134 6.094 59.436 6.351 62.73E 4.699 66,040 4.126 69,342 3.623 72.644 3.181 75,946 2.794 79.24B 2.453 82.560 2.154 85.852 1.891 89.154 1.661 92.456 1.458 95.758 1,281 99.0601 1,124 DATE: MARCH 21, 2005 Inflow(cfs) 14 i 12 '::••v • d •Inflow (cfs) 6 c° r'';• 0 _.- 0 20 40 60 80 100 120 time (minute) PROJECT: ANDREWS REACII PONI) 3 DATE: MARCH 21, 2005 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Inc Volume Acc. Vol. Sta e S Z 8 837 0 0 0 0 0 9 1278 1058 1058 1 1058 1 10 1963 1621 2678 2 2678 2 11 2801 2382 5060 3 5060 3 12 3756 3279 8339 4 8339 4 13 4755 4256 12594 5 12594 5 Ks= 1057.5 b = 1.539241035 STAGE -STORAGE CURVE 3.5 3 F 2.5 LL w 2 ♦ STORAGE 1.5 —Poly. (STORAGE) r N 1 r.0 I'RO,IECT: ANDREWS REACIi POND 3 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 3 OF 3 50 YR STORM ROUTING ORIFICE (IN) = 1.00 ORIFICE AREA (SO. FT.) = 0,005 WEIR LENGTH (FT) = 1.35 WEIR HEIGHT (FT) = 0.50 WEIR AREA (SF)= 0.68 TIME INFLOW STORAGE STAGE OUTFLOW 0.000 0,000 0.00 0,00 0.00 3.302 0.313 0.00 0.00 0.00 6.604 1,221 62.00 0.16 0.01 9.906 2.636 302.49 0.44 0.02 13.208 4.418 821.56 0.85 0.02 16,510 6.395 1692.38 1.36 0.03 19.812 8.372 2953.47 1,95 0.04 23.114 10.156 4605.00 2.60 0.04 26,416 11.573 6608,86 3.29 1.79 29.718 12A84 8546.331 3.89 3.11 33.020 12.800 10403,171 4.42 3.92 36.322 12.490 12162.00 4.89 4.52 39,624 11.585 13740.421 5.29 8.75 42.926 10.250 14302.041 5.43 11.91 46.228 9.001 13973.02 5.35 9.99 49.530 7.904 13776.29 5.30 8.94 52,832 6.940 13571,87 5.25 7.91 56.134 6.094 13378.93 5.201 7.03 59.436 5.351 13193.12 5.15 6,27 62.738 4,699 13011.39 5.11 5.62 66.040 4.126 12829.47 5.06 5.08 69.342 3,623 12640.18 5.011 4.70 72.644 3.181 12426.92 4.961 4.60 75.946 2.794 12144.99 4.881 4,52 79.248 2,453 11803.36 4.791 4.41 82.550 2.154 11415.66 4.691 4.28 85.852 1.891 1099194 4.581 4.14 89.1541 1.6611 10548.88 4,461 3.98 92.456 1.458 10089.99 4.33 3.80 95.758 1.281 9625.78 4.20 3.61 99.060 1.124 9163.89 4.07 3.41 102,362 0.987 8711.19 3.94 3.19 105.664 0,867 8273.91 3.81 2.97 108.966 0.761 7857.66 3.68 2.73 142.268 0.669 7467.57 3.56 2.48 115.570 0.587 7108,26 3.45 2.22 118.872 0.515 6783.94 3.35 1.96 122.174 0.453 4498.37 3.25 1.68 12'A 0.397 6254.92 3.17 1.40 228.778 0.349 6056.481 3.11 1.11 DATE: MARCH 21, 2005 THRESHOLD STAGES ORIFICE 1 0.083333 ORIFICE 2 3.00 OVERFLOW 5 INFLOW VS OUTFLOW 14.000 N •INFLOW 12.000 m.00a ;o 6.000e OUTFLO W LL 4.000 2.000 0.000 20.000 40,000 60.000 80.000 100,000 120.000 TIME (MIN) y 1•'.. � •I !'f Y1 � 1 �jyl �4 f ■ _ 0.000 �■s■■ - - PROJECT: ANDREWS REACII POND 4 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 1 OF 3 INFLOW HYDROGRAPH Qp= 15.7 cfs Tp= 33.91 min Time min Inflow cfs a 9 3.391 0.384 6.782 1.498 10,173 3.233 13.564 5.419 16.955 7.844 20.346 10.269 23.737 12.457 27.128 14.195 30.519 15.312 33.910 15.700 37.301 15.320 40.692 44.210 44.083 12.573 47.474 11.040 50,865 9.694 54.256 8.512 57.647 7.475 61.038 6.564 64.429 5.763 67.820 5,061 71.211 4.444 74.602 3.902 77.993 3.426 81.384 3,009 84.775 2.642 88.166 2.320 91 5571 2.037 94 9481 1.789 98.339 L571 W1.7301 1.379 DATE: MARCH 21, 2005 Inflow (cfs) 18 16 14I ♦`' _ _ u 10 , 8 ��: � ♦Inflow (cfs) o ♦ c 8 ♦ 4 0' 0 20 40 60 80 100 120 time (minute) PROJECT: ANDREWS 12 EACH POND 4 DATE: MARCH 21, 2005 PROJECT NO.: PW-476 50 YR STORM ROUTING SHEET 2 OF 3 STAGE -STORAGE RELATION ELEV. Surface Area Inc. Volume Acc. Vol. Sta e S Z 4 1286 0 0 0 0 0 5 2156 1721 1721 1 1721 1 6 3248 2702 4423 2 4423 2 7 4486 3867 8290 3 8290 3 8 5927 5207 13497 4 13497 4 Ks = 1721 b = 1.485633162 STAGE -STORAGE CURVE 3.5 3 p 2.5 i7,Fw4d•` it#f f"E. 1FaY1�L�w i ♦ STORAGE 1.5 n W ,gyp —Poly. (STORAGE) Y-_ ,z�5• 0.5 pi,�j 0 0 2000 4000 6000 8000 10000 STORAGE(CF) PROJECT: ANDREWS REM11 POND 4 PROJECT' NO.: PW-476 50 YR STORM ROUTING SHEET 3 OF 3 50 YR STORM ROUTING ORIFICE (IN) = 1.25 ORIFICE AREA (SO. FT.) = 0.009 WEIR LENGTH (FT) = 1.35 WEIR HEIGHT (FT) = 0.50 WEIR AREA (SF) = 0.68 TIME INFLOW STORAGE STAGE OUTFLOW 0.000 0.000 0.00 0.00 0.00 3.391 0.384 0.00 0.00 0.00 6.782 1,498 78.09 0.12 0.01 10.173 3.233 381.63 0.36 0.02 13.564 5.419 0035.14 0.71 0.03 16.955 7.844 2131.28 1,15 1.32 20.346 00.269 4458.44 1.60 2.57 23,737 22,457 0025.43 2.06 3.40 27,128 14.195 6868.38 2.54 4.10 30.519 15,312 8923.21 3.03 4.70 33.910 15.700 11082.77 3.50 5.22 37.301 15.320 13215.49 3.94 5,66 40,692 14.210 15181.58 4.33 10.56 44.083 12.573 15924.64 4.47 13,90 4T474 11.040 15653.92 4.42 12.63 50.855 9.694 15331.40 4.36 11.19 54,256 8.512 15027,17 4.30 9.93 57.647 7,475 14738.56 4.24 8.83 61.038 6.564 14462.08 4.19 7.88 64.429 5.763 14193.66 4.14 7.07 67.820 5.061 13928.00 4.09 6.39 71.211 4.444 13657.07 4.03 5.88 74.602 3.902 13365.33 3,97 5.69 77.993 3.426 13002.51 3.90 5,62 B1.384 3.009 12557.13 3.81 5.53 84.775 2.642 12044.66 3.71 5,42 88.166 2,320 11478.78 3.59 5.30 91.557 2,037 10871.63 3.46 5.17 04.948 1,7891 10234.06 3.32 5.02 98.339 1.5711 9575.77 3.17 4.87 101.730 1.379 8905.50 3.02 T69 105.121 1,211 8231.19 2.87 4.51 108.512 1.0631 7560.06 2.71 4.31 111.903 0.934 6898.76 2.55 4.11 115.294 0.8201 6253.47 2.38 3.88 118.685 0.7201 5629.97 2.22 3.65 122.076 0.63211 5033.75 2.05 3.40 125.467 0.555 4470.08 1.90 3,14 128.858 0,4881 3944.09 1,75 2,86 1322491 0.4281 3460.83 1.601 2.57 DATE: MARCH 21, 2005 THRESHOLD STAGES ORIFICE 1 0.104167 ORIFICE 2 1.00 OVERFLOW 4 INFLOW VS OUTFLOW 18.00014000 N 1 ♦INFLOW p ■ OUTFLOW u2.000 20.000 40.000 60,000 80.000 100.000 120.000 0.000 TIME (MIN) s.00B • �• {g� t�f:.W 0.000 t v �i�• eRJ"fi3tRvd"� ' 6.000 .'I ■ ■■�■0■ �..r�: i 4.000 0.000 � V w�FxLz aslN � DA2 DA3 aSIN3 OOFALU ^ ASIN< V DAY Drainage Diagram for andrews Osubcat Reach Pon Llnk. Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net 5/13/2005 HydroCAD® 6.00 s/n 000000 © 1986-2001 Applied Microcomputer Systems andrews Type 1124-hrRainfall=4.82" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydi,ocad.net Page 1 HydroCADG 6.00 s/n 000000 © 1986-2001 Applied Microcomputer Systems 5/13/2005 Pond INFILTRATION PIPE: INFILTR,ATIONPIPE [631 Warning: Exceeded Reach OUFALL4 inflow depth by 0.29' @ 12.50 firs [611 Hint: Submerged 26% of Reach OUTFALLI bottom [61) Hint: Submerged 26% of Reach OUTFALL2 bottom [611 Hint: Submerged 20% of Reach OUTFALL3 bottom Inflow = 15.07 cfs @ 12.29 hrs, Volume= 2.179 of Outflow = 14.45 cfs @ 12.43 hrs, Volume= 2.019 af, Atten= 4%, Lag= 8.7 min Discarded = 0.55 cfs @ 11.90 Ivs, Volume= 0.380 of Primary = 13.90 cfs @ 12.43 hrs, Volume= 1.639 of Routing by Stor-Ind method, Time Span= 5.00-20.00 firs, dt= 0.05 hrs Peak Elev= 4.79' Storage= 11,659 cf Plug -Flow detention time= 38.6 min calculated for 2.019 of (93% of inflow) Elevation Cum.Store (feet) (cubic -feet) 3.00 0 6.00 19,526 Discarded OutFlow (Free Discharge) t1=Exfiltration Primary OUtFIOw (Free Discharge) Z2=13road-Crested Rectangular Weir # Routing Invert Outlet Devices 1 Discarded 0.00' 0.55 cfs Exfiltration at all elevations 2 Primary 4.00' 6.0' long x 0.5' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Andrews Type 1124-hrRainfall=4.82" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Page 1 HydroCADC 6.00 s/n 000000 © 1986-2001 Apulied Microcomputer Systems "13/2005 Pond INFILTRATION PIPE:: INFILTRATIONPIPE Hydrograph Plot rxr,� 0. I� LL 5 6 7 8 9 1011 121314151617181920 Time (hours) El Inflow El Outflow 0 Discarded U Primary andrews Type 1124-hrRainfall=4.82" Prepared by I-IydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net puter SystemHydroCAD® 6.00 s/n 000000 © 1986-2001 Applied MicrocoPagee 1 w Pond INFILTRATION PIPE: INFILTRATIONPIPE Stage -Discharge U 10 .20 30 40 50 Discharge (cfs) r�. Total E0 Discarded Q Primary andrews Type 1124-hrRainfall=4.82" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Page 1 HydroCAD® 6.00 s/n 000000 © 1986-2001 Applied Microcomputer Systems 5/13/2005 C w Pond INFILTRATION PIPE: INFILTRATIONPIPE Stage -Area -Storage u 5,000 10,000 15,000 Storage (cubic -feet) STROUD ENIGMEERING, P.A. 3961-A Market Street WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 JOB Fij= "S KZrne-'V SHEET NO. OF CALCULATED BY WAS DATE CHECKED BY DATE_ _:.... .... _ ,R.I Fiil. '.O iS .._�_... 4ii �L....i7.�tl. ........i ......,. .._.. Sce........ I J.,.i' 015. ;N I .E 9A _.......... 12-_4. I....... .._._ ._,.......... i5l nli? . ,II t%..... _.._....... oyl!LeS�vr, c II I CA II. c7 II u�S�IJ_o �........_. ''. ...._ . -_ ............ ... ........... . .... .. ...... .... ..... .. i.. o TlC S-f¢u LTURi ... ..... .. _. _. .. _ ._ ..._.. �6a.wgP uv Fi Le" I fJ EL P ..10 Bi rml IS14k5RIkIEGI(pWWj STROUD ENGINEERING, P.A. 3961-A Market Street WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 !p,CA,rwG 6- wu r-c L IZ U q ... _...... JOB LOFIJS- SHEETNO. Z OF CALCULATEDBV WLS _ DATE-4� �G/0f r CHECKED BY DATE. ..q:............... _.__... ._.._..... ........._.. _.._.._. .... _ .......... ......_.... 2_.:3v I _ . .. iINpICfv 1 p'45 4)25IIHNNI JOB �n10F><WS �EActl STROUD ENGINEERING, P.A. 3961-A Market Street WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 SHEET NO. 5, OF CALCUTATEDBY l,i LS _ DATE CHECKED BY DATE SCALE ...... _...... _..._ . ...... ri-F✓!"� _ ;. .._... ...... ._.. ...._... ... _. .. .. ..... _ .... . .. ..... .. "'.. ........ ? it 9 sl 3' 4t 10 It{P ..,..- ._., .. ___ ..._...... .............__._ . ,z �+ I� - ....... _._..._. _. ..... ..... .._.......... _. .. il.u? K so ....... __ ..... I l PROEM M I Slryk Sheets) 205i IPoEAedl STROUD ENGINEERING, P.A. 3961-A Market Street WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 SHEET NO. `f OF CALCULATED BY WLS DATE CHECKED BY DATE SCALE PPL TAM 1 JSP Sj M6l 1Pa 4 S STROUD ENGINEERING, P.A. FACSE MLE TRANSMITTAL Date: 6/14/05 Number of Pages 3 To: DWQ From: ZAK SHIPMAN ATTN: Mr. Rob Gordon Telephone Number: Facsimile Number: E-Mail Address: Telephone Number: 910-815-0775 350-2004 Facsimile Number: 910-815-0593 E-Mail Address: zshipman@stroudengineer.com Reference: Andrews Reach ❑Original will follow via mail Comments: Rob, /Original will NOT follow via mail Per request. Call me if you have any questions or comments. "Thanks, Zak Shipman -Please call if you experience trouble with this transmittal- ■ 102 Suite D Cinema Drive, Wilmington, NC 28403 (910) 815-0775 FAX (910) 815-0593 ■ l 'd dSbl'IN 'V'd '9NIHAION3 HMS PH:l l SOH 'bl 'Unr JOB Ao"-� s IZr#,d STROUD ENGINEERING, P.A. SHEET NO, It - - OF 3961-A Market Street CALCUIATED13Y AVIA DATE WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 CHECKED BY DATE zi . ......... .......... _......I. --- ..... . .. . ...... .... .. Ir ;d"' ISZl 'ON *V 'd AH33NI0N3 HOLS NVEO:H SOH Engineering Consulting; Services, Ltd. Job Number: 11276 Job Name: Masonboro Loop Rd Infiltration Evaluation Location: Wilmington, NC Iland Auger Location Date Depth/ Elevation Soil Classification Blows Remarks B-1 03/25/2005 0-12" Topsoil Ground water was encountered at 72 inches below surface grade 12-54" Orange Gray Clay 54-60" Orange Gray Clayey Fine to Medium SAND 60-84" Tan Cray Silly Fine to Medium SAND 13-2 03/25/2005 0-12" Topsoil Ground water was not encountered at depths explored 12-66" Orange Cray Clay Infiltration Test QfRate=0.08 itdmin 66-78" Orange Cray Clayey Fine to Medium SAND 78-84" "ran Gray Silty Fine to Medium SAND B-3 03/25/2005 0-12" Topsoil Ground water was not encountered at depths explored 12-72" Orange Gray Clay 72-78" Orange Gray Clayey Fine to Medium SAND 78-84" Tan Gray Silty Fine to Medium SAND B-4 03/25/2005 0-12" Topsoil Ground water was not encountered at depths explored 12-24" Gray Silty Fine to Medium SAND 24-54" Orange Gray Clay 54-60" Orange Gray Clayey Fine to Medium SAND 60-84" Tan Gray Silty Fine to Medium SAND C, LTD Engineering Consulting Services, Ltd. .lob Number: 11276 Job Name: Masonboro Loop Rd Infiltration Evaluation Location: Wilmington, NC lland Auger Location Date Depth/ Elevation Soil Classification Blows Remarks 11-5 03/25/2005 0-12" Topsoil Ground water was not ene0antered at depths explored 12-42" Gray Orange Clayey Fine to Medium SAND 42-54" Gray Orange Silty Fine to Medium SAND . 54-72" Gray Orange Clay 72-84" Tan Gray Silty Fine to Medium SAND 13-6 03/25/2005 0-8" Topsoil Ground water was not encountered at depths explored 848" Gray Orange Clayey Fine to Medium SAND 48-60" Gray Orange Silty Fine to Medium SAND 60-78" Gray Orange Clay 78-84" 'fan Gray Silty Fine to Medium SAND 13-7 03/25/2005 0-12" Topsoil Ground water was encountered at 54 inches below surface grade 12-54" Gray Orange Clay 54-60" Gray Orange Clayey Fine to Medium SAND 60-84" Gray Silty Fine to Medium SAND B-8 03/25/2005 0-8" Topsoil Ground water was encountered at 84 inches below surface grade 8-48" Gray Silty Fine to Medium SAND Infiltration Test tiMate=0.06 in/min 48-60" Gray Orange Clay 60-78" Orange Gray Clayey Fine to Medium SAND 78-84" 'fan Gray Silty Fine to Medium SAND Engineering Consulling Services, Ltd. .lob Number: 11276 .lob Name: Masonboro Loop Rd Infiltration Evaluation Location: Wilmington, NC Flmnl Auger Location Date Depth/ Elevation Soil Classification Blows Remarks 13 -) 03/25/2005 0-48" Gray Orange Clay Ground water was not encountered at depths explored 48-84"" Gray Orange Clayey Fine to Medium SAND 13-10 03/25/2005 0-8" Topsoil Ground water was encountered at 54 inches below surface grade 8-18" Gray Silty Fine to Medium SAND 18-54" Gray Orange Clay 54-60" Gray Orange Clayey Fine to Medium SAND 60-84" Tan Gray Silty Fine to Medium SAND 13-11 03/25/2005 0-12" Topsoil Ground water was encountered at 78 inches below surface grade 12-36" Gray Orange Clay 36-48" Gray Orange Clayey Fine to Medium SAND 48-84" 'fan Gray Silty Fine to Medium SAND B-12 03/25/2005 0-12" Topsoil Ground water was not encountered at depths explored 12-60" Gray Orange Clay 60-72" Gray Tan Clayey Fine to Medium SAND 72-84" Gray Tan Silty Fine to Medium SAND Gnginecring Consulting Services, Ltd. .lob Number: 11276 ,lob Name: Masonboro Loop Rd Infiltration Evaluation Location: Wilmington, NC (land Auger Location Date Depth/ Elevation Soil Classification Blows Remarks B-13 03/25/2005 0-8" Topsoil Ground water was encountered at 72 inches below surface grade 8-18" Gray Silty Fine to Medium SAND I8-60" Gray Orange Clay 60-72" Gray Orange Clayey Fine to Medium SAND 72-84" Tan Gray Silty Fine to Medium SAND 13-14 03/25/2005 0-12" Topsoil Ground water was not encountered at depths explored 12-42" Gray Silty Fine to Medium SAND Infiltration Test #14/Rate=O.l in/min 42-60" Gray Orange Clay 60-78" Gray Orange Clayey Fine to Medium SAND 78-84" Tan Gray Silty Fine to Medium SAND B-15 03/25/2005 0-8" Topsoil Ground water was not encotntered at depths explored 8-36" Gray Silty Fine to Medium SAND 36-60" Goy Orange Clay 60-72" Gray Orange Clayey Fine to Medium SAND 72-84" Tan Gray Silty Fine to Medium SAND Michael F. Easley, Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources : 1 June 9. 2005 Mr. Kirk Andrews, President Footings of Wilmington, Inc. 3129 Braemar Lane Wilmington, NC 28409 Subject: Request for Additional Information Stormwater Project No. SW8 050414 Andrews Reach New Hanover County Dear Mr. Andrews: Alan W. Klimek, P.E. Director Division of Water Quality The Wilmington Regional Office received a Stormwater Management Permit Application for Andrews Reach on June 8, 2005. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: 1. Please locate all basins in dedicated drainage easements 2. The total drainage area in the application does not match the drainage area used in the calculations. 3. Please correct the outlet structure detail schedule elevations. They do not reflect the changes made to the weir elevations to increase storage in the system. 4. Please provide the drawdown orifice with a trash rack. Because the orifice size is so small be sure to make the maximum opening size smaller than the orifice size 5. Please provide an updated Infiltration Trench supplement. ) Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to June 17, 2005, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone (910) 796-7215 Customer Servicel-877-623-6748 Wilmington Regional Office Wilmington, NC 28405-3845 FAX (910) 350-2004 Internet: h2o.enr.state.nc.us An Equal OpponunitylAffirmative Action Employer— 50% Recycled110% Post Consumer Paper None rthCarolina Naturally Mr. Kirk Andrews June 9, 2005 Stormwater Permit # SW8 050414 Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter please feel free to call me at (910) 796-7303. Sincerely, A Robert D. Gordon Environmental Engineer II ENB/RDG: S:\WQS\STORMWATER\ADDINFO\2005\050414June9 cc: Zak Shipman, Stroud Engineering Robert D. Gordon 7 STROUD ENGINEERING, P.A. 102-D Cinema Drive WILMINGTON, NC 28403 (910) 815.0775 TO n�n�rlR -p. tt KEETET 5LN OO IF ° LIVc�JLMJO��C;.1LS DATE JOB NO. a of PiJtiYp ATTENTIOI 1 7 Ka CM 60.01>1L RE: WE ARE SENDING YOU ❑ Attached ')!!i Under separate cover via Nnuo bXvC"— the following items: ❑ Shop drawings ❑ Prints ❑ Plans ❑ Samples ❑ Specifications ❑ Copy of letter ❑ Change order ❑ COPIES DAl'E NO. DESCRIPTION xT s f r.J Scr / Cn�cti t„g-rtYP— THESE ARE TRANSMITTED as checked below T{ For approval ❑ For your use ❑ As requested )J For review and comment ❑ FORBIDS DUE REMARKS ❑ Approved as submitted ❑ Approved as noted ❑ Returned for corrections ❑ Resubmit copies for approval ❑ Submit copies for distribution ❑ Return corrected prints ❑ PRINTS RETURNED AFTER LOAN TO US COPY TO SIGNED: //enclosures are not as noted, kindly notify us at once. STROUD ENGINEERING, P.A. CONSULTING ENGINEERS 102-D CINEMA DRIVE WILMINGTON, NORTH CAROLINA 28403 (910)815-0775 June 8,2005 NCDENR Division of Water Quality 127 Cardinal Drive Wilmington, NC 28405 Attn: Mr. Robert Gordon Re: Andrew's Reach, SW 050414 Dear Mr. Gordon, Please find the enclosed revised plans, calculations, and application forms for the reference project. Per your comments of June I, 1 have revised the plans accordingly and are resubmitting for your review in consideration towards issuance of a State Stor mwater Management permit. Some of the modifications to the plan is as follows below: • The application has been revised to reflect Footings of Wilmington Inc. in lieu of LLC. Covenants (attached) have also been revised accordingly. • Road cross sectional details have been provided on the preliminary site plan. A cul-de-sac cross section and detail has also been provided. • Mean high water has been delineated on the drawings. A 50 foot setback has been observed from this line. • The storage of the infiltration system has been modified to provided adequate capacity for the design event. Including the trench, conveyance pipes, and basins (outlet structures have been modified) provided adequate volume for the system to work. • Weir outlets have been provided at the junction boxes (type A) • Section III #6 has been corrected to show future development in the "Other" column. 1 have included impervious area from the pool/clubhouse in the "Onsite Buildings" • A print showing the delineated drainage areas is attached for your review. All numbers should match up with those used in the calculations (Drainage area and impervious). • A second pipe has been added to the infiltration trench cross section showing the correct configuration. Also the height of the trench has been corrected. • The site data table has been corrected. Please note that I discovered a severe error in the computation of the roadway impervious area calculations. I have corrected the calculations, drawings, and application accordingly. The error made a significant impact on the volume to be infiltrated due to the substantial reduction of impervious used. I appologize for the confusion. • Consistent infiltration rates have been used throughout the calculations. • A clay liner has been added to the detention basins. A detail is included on the detail sheet (attached). Please review these plans at your convenience and consider towards the issuance a stormwater permit. If you have any questions or additional comments, don't hesitate to call me at (910) 815-0775. 107 COMMERCE ST. HESTRON PLAZA TWO SUITE B 102-D CINEMA DRIVE 151-A HWY. 24 GREENVILLE, NC 27858 WILMINGTON, NC 28403 MOREHEAD CITY, NC 28557 (252)756-9352 (910) 815.0775 (252) 247-7479 .1'G Cen y, 0 Sweyer & Associates asp -oar Corporate Office June I,2005 RECEIVED 1630 Military Cutoff Rd I _ , J U N 0 2 2005 Phone: 91 Wilmington NC NC 28403 ' '"' " ' ' fo:„ Jin1 Dicpentirock�-- I Toll Free: 800.848,0021 ,. Associate Planner BY; Fax:910.256.0000 I'lanuing and Development ' Sales Division City of Wilmington PO 13ox I810 Landfall Office 1630 Military Cutoff Rd Wilmington, NC 28402-I810 Suite 110 Wilmington, NC 28403 Frool: Dav!(l Morvil, PresiGlent Phone: 910.256.0021 SUIICOGIrt Villas I-IOA Toll Free: 800.848.0021 Fax:910.256.0000 5004 Villa Place, West Wilmington, NC 28R09 Monkey Junction Office 5215 Junction Circle Subject' Coil lirnlalion of phone conversation on 5/31/05 regarding Suite 102 the shared drainage Glitch between Suncourl Villas (SCV) and the Wilmington, NC 28409 Phone: 910.332.0336 proposed Andrews Reach Development (ARD). Toll Free: 800.474.3090 Fax: 910.332,0337 As we discussed, we are vel'y concerned with (he lacks of an Hampstead Office approved drainage ditch plan at this point in time. We wish to 14865 Hwy 17 North inlin'I» the City and ARD that we have a vestecl interest in the Hampstead, NC 28443 drillllagC dltCh (flooding that could be caused by a ina'jor slol'm or Phone: 910-270-3606 excessive rainfall) and oppose construction of a Ghainage pipe of - Toll Free 800.476.3606 Fax:910.270.3380 structure That would impede runoff. Is ARD planning to cross our property line for construction work on the Glitch? Relocation Division 1630 Military Cutoff Rd We are very concerned that the present site plan fails to include the Suite0 Wilmington, NC 2844033 g existing ditch between SCV I IOA common area and the future Phone: 910.256.6429 clevelopnlent by ARD of up to eighteen (118) units, designated by Toll Free:800.352.0021 the properly line at N23"28'49"W. At the May 7, 2003 planning Fax: 910.256.0000 conunissiat meeting I inforuled you of this oversigll(, and this Rental Division oversight has still not been corrected. 1630 Military Cutoff Rd Suite 104 We have also not received an)ltralColl mCityr Wilmington, NC 28403 for our I'eGluest for the ARD to participate financially in the Phone: 910.256.3031 Toll Free: 800.448.1761 ongoing future maintenance of the Glitch. Fax: 910.256.0484 We arc especially concerned alter the flooding situation that was Community created at Nantucket Subdivision after construction at the Reserve Association of Masouboro, which the city of Wilmington approved. Mgmt Division Wilmington Office We hope you will respond to these concerns prior to beginning of 1630 Military Cutoff Rd Suite 108 construction. Wilmington, NC 28403 Phone: 910.256.2021 '!'hank you, Fax: 910.256.3794 Southport Office David Nloivil 828 Folly Drive, S.E. President, Suncourl Villas FICA Bolivia, NC 28422 www.century21 sweyer.com Phone: 910,842,2295 Fax: 910.842.2297 Each CENTURY 21 office is independently owned and operated Cc: Mr. Phil Bevilacqua Storm Water Review Dept. City of Wilmington PO Box 1810 Wilmington, NC 28402-1810 Mr. Paul Bartlett. P.E. Division of Water Quality NCDENR 127 Cardinal Drive Extension Wilmington, NC 28405 P. 1 COMMUNICATION RESULT REPORT ( JUN. 2.2005 8:05AM ) TTI NCDENR WIRO FILE MODE OPTION ________________ADDRESS -(GROUP)_____------ PAGE ----- ---------------------------- 489 MEMORY TX 9-0150593 OK P. 3/3 REASON FOR ERROR E-1) HANG UP OR LINE FAIL E-3) NO ANSWER E-2) BUSY E-4) NO FACSIMILE CONNECTION FAX COVER SHEET Date: June 1, 2005 No. of Pages: 3 To: Zak Shipman From: Robert Gordon Company: Stroud Engineering Express permitting section FAX #: (910) 815-0593 FAX # 910-350.2004 Phone # 910-796-7303 DWQ Stormwater Project Number: SW8 050414 Project Name: Andrews Reach MESSAGE: Request for additional information for express stormwater permit. Mailed copy to follow. Please call if you have any questions. Thank you In FAX COVER SHEET Date: June 1, 2005 No. of Pages: 3 To: Zak Shipman From: Robert Gordon Company: Stroud Engineering Express permitting section FAX #: (910) 815-0593 FAX # 910-350-2004 Phone # 910-796-7303 DWQ Stormwater Project Number: SW8 050414 Project Name: Andrews Reach MESSAGE: Request for additional information for express stormwater permit. Mailed copy to follow. Please call if you have any questions. Thank you I o�oF warF9oG r O 't June 1,2005 Mr. Kirk Andrews, President Footings of Wilmington, LLC. 3129 Braemar Lane Wilmington, NC 28405 Subject: Request for Additional Stormwater Project No. Andrew's Reach New Hanover County Dear Mr. Andrews: Michael F. Easley, Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Information SW8 050414 Alan W. Klimek, P.E. Director Division of Water Quality The Wilmington Regional Office received a Stormwater Management Permit Application for Andrews Reach on May 31, 2005. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: 1. The NC Dept. of the Secretary of State lists Footings of Wilmington, Inc as a registered( business, not Footings of Wilmington, LLC. Please place the correct business name on the application. The zip code is also incorrect. 2. Please include a road cross-section (with sidewalk) and cul-de-sac detail on the drawings with dimensions. 3. Please delineate the mean high water line on the drawings. 4. Please locate the infiltration system and outlet at least 50' from the mean high water line. 5. The storage in the system is inadequate. The system must store the first 1.5" of runoff (56285 ft3). The detention basins (below overflow weirs) store—11,500 ft3. The Infiltration system stores — 20166 ft3. The conveyance pipes to the infiltration system (below 6.0 MSL) store -- 6200 ft3. The system infiltration during the design storm (80 min hydrograph used in calcs) is — 2700ft3. All other runoff will bypass the proposed system; 11,500 + 20,166 + 6,200 + 2,700 = 40,560 < 56,285. ;I 6. In order to' provide an adequate bypass, please provide weir outlets to the outlet pipes of detention basins 2 & 3 (convert to JB type "B"). 7. Please correct section III, #6 on the application to reflect the actual infiltration system drainage area. Please show the 34,000 future development BUA as "Other on -site" rather than off -site (because it is included in the total project area). 8. Please delineate storage/detention basin drainage areas. There appears to be a discrepancy between the DA draining to each storage/detention basin and the total DA draining to the infiltration system (3.47 + 5.91 + 2.53 + 3.18 = 15.09 vs. 16.84 in NCDENR stormwater calcs). There is also a similar discrepancy with the total impervious area calculations. North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone (910) 796-7215 Customer Service"77-623-6748 One Wilmington Regional Office - Wilmington, NC 28405-3845 FAX (910)350-2004 Internet: h2o,encstate.nc.us North Carolina f // An Equal OppodunitylAff rmative Action Employer- 50% Recycled/10% Post Consumer Paper Aaturrally Andrews Reach June 1, 2005 Stormwater Permit # SW8050415 The infiltration trench cross-section shows only 1 pipe, please show the correct # of pipes. The total height of the trench shows 3 ft (1.25 + 1.75), but 4.2 ft was used in the volume calculations. Please correct this discrepancy. 10.The site area (adjacent to the vicinity map) shows incorrect impervious area totals. 11. Please use consistent infiltration rates (3.75 listed on supplement, 3.0 used in calcs). 12. Please provide additional detail about the required liner for the detention basins. Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to June 10, 2005, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter please feel free to call me at (910) 796-7303. Sincerely, IUAA� Robert D. Gordon Environmental Engineer II ENB/RDG: S:\WQS\STORMWATER\ADDINFO\2005\050414June1 cc: Stroud; Engineering Robert- D. Gordon STROUD ENGINEERING, P.A. 102-D Cinema Drive WILMINGTON, NC 28403 (910) 815-0775 TO I.fLpffl%n-- DIw�Q dINVU12n OCP 4 D e K@WUV4LQd DATE s slDs JOB NO. Pwv7ce A ENTI N c. rnaeoi�l rJcAtic*� RE: nn� WE ARE SENDING YOU ❑ Attached S Under separate cover via �-ob ' G44ZR— the following items: ❑ Shop drawings ❑ Prints ❑ Plans ❑ Samples ❑ Specifications ❑ Copy of letter ❑ Change order ❑ COPIES DATE NO. DESCRIPTION 3 '�,J ,SQD ,,.j•�$ I enuB1L (,.3TtEl— THESE ARE TRANSMITTED as checked below: * For approval ❑ For your use 14 As requested �9 For review and comment ❑ FORBIDS DUE ❑ Approved as submitted ❑ Approved as noted ❑ Returned for corrections ❑ Resubmit copies for approval ❑ Submit copies for distribution ❑ Return corrected prints ❑ PRINTS RETURNED AFTER LOAN TO US pow w4 Pam__ fir.RTC[i T.�...rtn.•,.+• C� ti6 w,rH ,,i C7,r,oJS. COPY SIGNED: It5X❑ If enclosures are not as noted, kindly notify us at once. Page 1 of 1 North Carolina Elaine F. Marshall DEPARTMENT OF THE Secretary SECRETARY OF STATE Corporations OCorporations Home *Important Notice *Corporate Forms/Fees *Corporations FAQ *Tobacco Manufacturers •Dissolution Reports *Non -Profit Reports *Verify Certification *Online Annual Reports Links *Secretary Of State Home •Register for E-Procurement *Dept. of Revenue Legislation 01999 Senate Bills •2001 Bill Summaries *Annual Reports 1997 *Corporations 1997 *Other Legislation Search *By Corporate Name *For New Corporation OBy Registered Agent Online Orders •Start An Order *New Payment Procedures Contact Us •Corporations Division: •Secretary of State's web site Print sPrintable Page PO Box 29622 Raleigh, NC 27626-0622 (919)807-2000 Date: 5/31 /2005 Click here to: View Document Filings I Print apre-populated Annual Report Form I File an Annual Report I Corporation Names Name Name Type NC FOOTINGS OF Legal WILMINGTON, INC. Business Corporation Information SOSID: 0390537 FID: 561964371 Status: Current -Active Date Formed: 3/5/1996 Citizenship: Domestic State of Inc.: NC Duration: Perpetual Registered Agent Agent Name: Registered Office Address: Registered Mailing Address: Principal Office Address: Principal Mailing Address: Andrews, Marlon Kirk 3129 Braemar Lane Wilmington NC 28409 3129 Braemar Lane Wilmington NC 28409 3129 Braemar Lane Wilmington NC 28409 3129 Braemar Lane Wilmington NC 28409 Stock Class Shares No Par Value Par Value COMMON 100000 Yes N/A For questions or comments about the North Carolina Secretary of State's web site, please send e-mail to Webmaster. http://www.secretary.state.ne.us/Corporations/Corp.aspx?Pitemld=4649747 5/31 /2005 CAPE PEAR RIVER BASIN Name of Stream Subbasin Stream Index Number Map Number Class Hendon Creek CPFOS 16-41-4-1-(2) D22SE5 WS-IV;NSW,CA Herds Creek CPF14 18-23-16-3 F21SE5 WS-III Herrings Marsh Run CPF22 18-74-19-16 G27SW2 C;Sw Hester Lake CPFO1 16-6-2-3 B20SW4 WS-III;NSW Hewletts Creek CPF24 18-87-26 K27NW6 SA;HQW Hiatt Branch CPFOS 17-3-1-(1) C1BSE9 WS-IV:` Hiatt Branch CPF08 17-3-1-(2) C1BSE9 WS-IV;CA:- Hickman Branch CPF17 18-81-6-1-2 K26SE1 C;Sw Hickory Branch CPF13 18-20-13-9 F23SW1 C Hickory Creek CPFOB 17-8.5-(1) D19NE1 WS-IV:• Hickory Creek CPFOB 17-8.5-(3) D19NE1 WS-IV;CA:• Hicks Branch CPF19 18-68-2-6-1 H26NW3 C;Sw Hide Branch CPF13 1B-20-13-3-2 F22SW6 C Hill Creek CPF04 16-38-2-(1) E22NW2 C;NSW Hill Creek CPF04 16-38-2-(2) E22NW2 WS-IV;NSW Hobbs Pond CPF19 18-68-1-14 H25NW6 C;Sw Hoe Swamp CPF19 18-68-2-1 G25NEB C;Sw Hog Branch CPF04 16-27-2 C22SWB WS-II;HQW,NSW Holly Shelter Creek CPF23 18-74-33 I28NWS C;Sw Honey Creek CPF23 1B-74-48 J27NE4 C;Sw Hood Creek CPF17 18-66 K26NE1 C;Sw Hornet Swamp (Horner Swamp) CPF19 18-68-1-17-3 G25SW1 C;Sw Horse Branch CPF14 18-23-16-9 F22SW7 WS-III Horse Branch CPF23 18-74-55-1 I27SW1 C;Sw Horse Creek CPF10 17-26-5-6-1 F20NE7 WS-III Horse Creek CPF14 18-23-14 G22NW4 WS-III Horse Pen Branch CPF13 18-20-20 F23SW5 C Horse Pen Branch CPF21 18-74-3-1 G27NW4 C;Sw Horsepen Branch CPF16 18-61-4-1 J25NEB WS-IV;SW Horsepen Branch CPF19 18-68-1-17-12 H25SW2 C;Sw Horsepen Branch CPF21 18-74-12 G27SE1 C;Sw Horsepen Branch CPF22 18-74-19-9-2 G26SEI C;Sw Horsepen Creek CPF02 16-11-5-(0.5) C19SW2 WS-III;NSW Horsepen Creek CPF02 16-11-5-(2) C19NE7 WS-III;NSW,CA Housland Branch CPF21 18-74-16 G27SE4 C;Sw Howard Channel CPF24 18-87-13 J28SW2 SA;ORW Howard Pond CPF19 18-68-1-17-7 H24NE3 C;Sw Howe Creek CPF24 18-87-23 J27SE8 SA;ORW Hudson Branch CPF04 16-27-4-1 D22NW2 WS-II;HQW,NSW Hughes Creek CPF07 18-4-7 E22SE4 WS-IV Hughes Mill Creek CPF02 16-14-6-1 B21SES WS-II;HQW,NSW Hunting Branch CPF04 16-28-2 D21NW9 C;NSW Hybarts Branch CPF15 18-27-5-1-1 G23SW5 C Indian Branch CPF13 18-20-26-1 F23NE7 WS-IV Indian Creek CPF05 16-41-1-18-(1) D23SW5 WS-IV;NSW Indian Creek CPF05 16-41-1-18-(2) D23SW4 WS-IV;NSW,CA Indian Creek CPF10 17-35 E21SE4 WS-IV Indian Creek CPF16 18-46-4 124NE2 C Indian Creek ! CPF17 18-70 J26SE4 C;Sw Indian Creek (Jessups Pond) CPF16 18-42-1 H24SW1 C Ingle Branch CPF03 16-19-5-2 C20SE6 C;NSW Intracoastal Waterway CPF24 18-87 J29NW2 SA;ORW Intracoastal Waterway CPF24 18-87-(5.5) J28NE3 SA;HQW Intracoastal Waterway CPF24 18-87-(11.5) J28SW2 SA;ORW Page 12 of 30 STROUD ENGINEERING, P.A. CONSULTING ENGINEERS 102-D CINEMA DRIVE WILMINGTON, NORTH CAROLINA 28403 (910) 815-0775 May 31, 2005 NCDENR Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Attn: Mr. Paul Bartlett, P.E. Re: Andrew's Reach, SW8 050414 Stormwater Dear Mr. Bartlett, Thank you ter your review of the subject project. Per your comments, we have made some revisions to the plan and are resubmitting in hopes of obtaining a stormwater permit for the subject project. Before individually addressing each revision which has been made to the plan, I would like to summarize in more detail the method by which stormwater will be treated. As you probably know, the hydraulics of this system are extremely complex, and it has been a difficult task to analyze and refine the design. The system works in the following way: stormwater from the City design storm is detained in the four basins and released at the predevelopment rate. No infiltration is accounted for at the location of these basins (soils). From these basins, stormwater is drawndown and conveyed via 36" plastic pipe to the dual infiltration pipes along the back of the project. This water, which represents the first portion of the I 'h" design storm, is absorbed in the trench. As the trench approaches its storage capacity, infiltration reaches a maximum level and the pipe fills. Meanwhile, additional discharge from the City basins (which makes up runoff in excess of the 1 '/z" event) is bypassed from the system at one of several junction boxes and is discharged from the system. The infiltration trench, however, is still continually taking in water at the infiltration rate. As the storm progresses, the City basin's discharge is reduced, and the system again returns to steady state operation and infiltrates the remaining volume. Additionally, we have addressed several continents from your review as summarized below: • Andrew's Reach LLC has not been formed. Footings of Wilmington, LLC will be the perruittee as shown. I have revised a new page I of the application accordingly. • Drainage areas and impervious areas have been reviewed and corrected. Future development has in fact been accounted for in the design of the infiltration volume. I have included a corrected sheet 2 of the application with the revised impervious areas. • Deed restrictions have been corrected to limit future impervious to 34,000 sf and BUA on the lots to 5000 sf • Details for the trench system have been modified and corrected to adequately show outlets, weirs, and headers • 'french volumes have been computed using a void ratio of 40% for k57 stone • Basins are for City storage only and will not provide any infiltration. A note requiring these to be lined has been shown on the plan. • A schedule of Catch basin andjullction box inverts has been included to outline the runoff distribution for the system. Outlet structure details have been shown on the detail sheet • The swimming pool and clubhouse area have been shown in a detail and their impervious factored into the calculations. The pool will be for residents only and no additional parking is provided. 107 COMMERCE ST HESTRON PLAZA TWO SUITE B 102-D CINEMA DRIVE 151-A HWY. 24 GREENVILLE, NC 27858 WILMINGTON, NC 28403 MOREHEAD CITY, NC 28557 (252) 756-9352 (910) 815-0775 (252)247-7479 • The cul-de-sac has been dimensioned as shown and a detail showing the cross section has been added. • All drawings and calculations have been PE stamped and signed. We hope these changes and description satisfy your concerns for this project. The system, while complex, does work and we feel it presents a good solution to some challenging constraints that exist on this project. Please feel free to contact me with any questions or comments you should have or if you wish to discuss the project further. Thank you for your review and I look forward to your response. Best, Zak Shipman Stroud Engineering, P.A. Attachments WZS/7s Mr. Paul T. Bartlett, P.E. Div. of Water Quality NCDENR 127 Cardinal Dr. Ex. Wilmington, NC 28405 Ref. Project #SW8050414, Andrews Reach Dear Mr. Bartlett, 5110105 1433 Villa Pl. E. Wilmington, NC 28409 MAY M1 6 2005 5 I ant writing on behalf of the HOA for Sun Court Villas. We are concerned that lire development Andrews Reach will have a negative affect on our drainage system. The property line we share with Andrews Reach contains one of our drainage ditches. This ditch is at capacity level after hurricanes. We need to be certain that the storm water from Andrews Reach is completely self contained, and will in no way hinder our system of ditches. Please assure us that we will not be at risk, and that their drainage is self-contained. Very truly yours, Sally Case Cc: David Morvil, Pres. SCV HOA t rt:. '�rl tit.. :1;: {125t :.. � .` 1•; 11 ...fJ - '. i�.t' „Sla' _ co ���,, . !�. . .,.._ i.i... 4:� ,... ., .. �OF WA7_ 90 Michael F. Easley, Governor O G William G. Ross, Jr., Secretary v- North Carolina Department of Environment and Natural Resources O Alan W. Klimek, P.E. Director Division of Water Quality April 21, 2005 Mr. Kirk Andrews Andrews Reach, LLC 3129 Braemar Lane Wilmington, NC 28405 Subject: Request for Permit Application Resubmittal Stormwater Project No. SW8 050414 Andrews Reach New Hanover County Dear Mr. Andrews: The Wilmington Regional Office received a Stormwater Management Permit Application for Andrews Reach on April 19, 2005. An application review has determined that the submitted application is insufficient, as itemized below, and needs to be resubmitted. Please provide documentation to demonstrate that Andrews Reach, LLC is registered with the N.C. Department of the Secretary of State. If Andrews Reach is registered as an LLC, please provide documentation to demonstrate that you are a "Member" or "Member/Manager" and enter one of those titles in Section 1.2 of the application. If Andrews Reach is registered as a corporation, partnership, or sole proprietorship, the signing official must be a vice president or higher, general partner, or proprietor, respectively, as specified by N.C. Administrative Code Section 15A NCAC 02H.1003(e). Please clarify the drainage area, drainage basin(s), and impervious areas in Section III, Items #3 through #6 of the application. Please clarify whether or not the future development area for up to 18 units is part of the 27.3 acres given as the drainage area, or is it a separate basin that drains to Masonboro Loop Road? The submitted calculations list 426,888 sq ft of impervious area and Section 111.6 of the application incorrectly lists 412,956 sq ft. Please clarify Section 111.6 by substituting "Lots BLA" for "Buildings" and then listing "streets", "parking/driveways" (including pool/clubhouse area), "sidewalks", and 'other on - site" (including future development of 18 units, and clubhouse footprint/pool deck, if previously not listed). Please revise Article VIII, Section 2.E. of the deed restrictions to state that: 'The maximum allowable built -upon area for Lots 1 through 40 is 5;000 square feet per lot". Please add the built -upon area for the future development of up to 18 units to Section 2.E as either a total amount or per unit for a specified number of units. North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone (910) 395-3900 Customer Service1-877-623-6746 One Wilmington Regional Office Wilmington, NC 28405-3845 FAX (919)733.2496 Internet: h2o,enr.state.nc.us North Carolina An Equal OpportunitylAffirmative Action Employer— 50% Recycledl10% Post Consumer Paper Naturally Mr. Kirk Andrews April 21, 2005 Stormwater Application No. SW8 050414 Please clarify the following items for the trench system outlet structure: (a) the invert elevation is not legible on Sheet 2 of 8, and (b) the detail on Sheet 6 of 7 needs to be revised. The 2.0-inch dewatering orifice is not required, and the overnow elevation is listed as 6.0' on the supplement but shown as 4.2' on sheet 6 of 7. The detail does not illustrate the arrangement for two infiltration system pipes and one city detention basin pipe either being combined into a header or directly penetrating the outlet structure. 5. Please enter the "Stone Type" and "Stone Void Ratio" in Section II, page 1 of the supplement (No. 57 washed stone labeled in Trench Detail on Sheet 6 of 7) and complete the calculations for storage volume with a voids ratio. 6. Please be advised that credit will only be given for using the detention basins as an infiltration device if the basin is unlined and the bottom is a minimum of 2' above the seasonal high water table. The basins will either be permitted for storage volume or infiltration, not for both functions. The submitted "Field Infiltration Testing" report by ECS Ltd. dated March 31, 2005 does not include borings for SHWT and infiltration testing at the basin bottom locations. If the basin bottom is <2' above the SHWT, then the basin must be lined with an impermeable liner material and the basin will be allowed only for storage. Using the basins for infiltration leads to other issues involving distribution of stormwater runoff in a manner that allows each basin segment to accommodate its volume. There is insufficient information in the current application to make a determination regarding such distribution. Specifically, a schedule of catch basin, junction box, and outlet structure invert elevations must be submitted, including inlet/outlet structures for detention basins. A marked print delineating the drainage area for each detention basin needs to be submitted, and those areas need to coincide with the areas used in the calculations. OS details are required, including the need for: (a) bypass overflow for volumes that exceed the 1.5" design storm, (b) trench system OS details per Item #4 above, (c) details for the unlabeled OS at JB5, and (d) additional details for J135 to illustrate either a header for the two infiltration trench pipes or two JB penetrations for the trench pipes. Please dimension the swimming pool and apron area and label the apron area as concrete or wood deck. Please dimension the clubhouse and illustrate and dimension any parking area associated with the pool/clubhouse. Please dimension the cul-de-sac radius on Sheet 2 of 3 and provide a cross-section detail through the cul-de-sac. 10. Please PE -stamp and date all drawings and the revised calculations. Please contact this Office when the application is complete and ready for resubmittal. A second review date will be scheduled at that time. Additional fees, not to exceed 50% of the original permit application fee, may be charged for subsequent reviews due to the insufficiency of a permit application, as specified by Section 11.4A of S.L. 2003-284. An additional fee of 25% ($1,000.00) will be charged for reviewing the resubmitted application. Page 2 of 3 I Mr. Kirk Andrews April 21, 2005 Stormwater Application No. SW8 050414 The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter please feel free to call me at (910) 395-3900. Sincerely, ,�' �13aA- Ed Beck Acting Regional Supervisor Surface Water Protection Section ENB/ptb: S:\WQS\STORMWATER\ADDINFO\2005\050414 cc: Stroud Engineering, P.A. Paul T. Bartlett, P.E., Express Permitting Page 3 of 3 T NCDENR North Carolina Department of Environment and Natural Resources 127 Cardinal Drive, Wilmington NC 28405 (910) 395.3900 FAX (910) 350-2004 /J Request for Express Permit Review - 'C 0 776,Q�1 FILL-IN all information below and CHECK required Permit(s). FAX or email to Cameron. WeaverOncmail.net along with a narrative and vicinity map of the project location. Projects must be submitted by 9:00 A.M. of the review date, unless prior arrangements are made. APPLICANT Name_- Kirk Andrews Company r Address 3129 Braemar Lane City/State_Wilmington Zip 28405 County New Hanover Phone 910-397-0609 Fax Email PROJECT Name Andrew's Reach PROJECT LOCATED IN Cape Fear RIVER BASIN Company Stroud En ineerin P.A. Address 102 D Cinema Drive City/State Wilmington, C Zip 28405 County New Hanover ❑ STREAM ORIGINATION CERTIFICATION; Stream ® STORMWATER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other ❑ Low Density -Curb & Gutter ® High Density -Infiltration ❑ Off Site ❑ COASTAL ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information MANAGEMENT ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront —.— ....... — — -- -- — — — — —--............... — .... _ -- -- --- ❑ LAND QUALITY ❑ Erosion and Sedimentation Control Plan with acres to be disturbed. ❑ WETLANDS (401) ❑ No Wetlands on Site (letter from COE) ❑Wetlands Delineated/No JD ❑ Greater than 0.1 AC Wetlands Impacted ❑Jurisdictional Determination has been done ❑ Less than 0.1 AC Wetlands Impacted ❑Greater than 0.5 AC Wetlands Impacted The legislation allows additional fees, not to exceed 50% of the original Express Review permit application fee, to be charged for subsequent reviews due to the insufficiency of the permit applications. SUBMITTAL DATES: SW CAMA LQS 401 For DENR use onlyy�— Fee Split for multiple permits: $ 41 V r 7 �r-c� Q Total Fee Amount $ Z 'd 9L60 IN 'V'd 'DNI833NI9N3 01`10b1S NVE:6 SOOZ '9 'aV PROJECT NARRATNE Project Summary The purpose of this project is to construct 40 single family residences on the subject 27 acre site. The site is bounded to the west by the salt marsh of Bridges Creek and to the east by Masonboro Loop Road. The project falls within the jurisdiction of the City of Wilmington Planning and Zoning Department. Up to 18 multi -family units are proposed as future development but will not be constructed at this time. Adjoining Property Property adjoining the site is primarily residential in nature. A mined use development is currently being constructed across from Masonboro Loop Road from the site. Soils Soils on site are mapped in the New Hanover County Soil Survey primarily as Craven, however small pockets of Lakeland and Seagate soils also exist on site. Please note that there has been some previous discussion with NCDENR representatives concerning the soils on this site. A full report outlining infiltration rates and soils will be submitted with project plans. Proposed Stormwater Management Practices Stormwater will be collected via a system of catch basins and conveyed to several dry City detention basins. From there, stormwater will be drawndown through the basin outlet structure and piped to an additional junction node where it will enter a 36" perforated pipe in an infiltration trench. This trench will dictate that the fast inch and a half of rainfall be infiltrated per State requirements. A outlet structure will provide for the release of stormwater in excess of the design storm into the adjacent wetlands. The conceptual layout of the site seeks to minimize the impact on the natural drainage features on the site and provide an environmentally friendly design. E 'd 91EO'IN 'V'd 'DNAEN[DN3 WES NV6Z:6 SOOZ '9 IdV r t TO MARKET STREET -0 WRIGHTSVILLE LEACH TO CAROLLINA BEACH I NOT TO SCALE d-9LEO'IN 'V'd 'ONIU3N19N3 VOHS WV6Z 6 SOOT '9 'adV s STROUD ENGINEERING, P.A. Date: 4/6/05 Number of Pages 4 To: NCDENR ATTN: CAMERON WEAVER Telephone Number: Facsimile Number: 350-2004 E-Mail Address: FACSIMILE TRANSMITTAL From: ZAK SHIPMAN Telephone Number: 910-815-0775 Facsimile Number: 910-815-0593 E-Mail Address: zshipman@stroudengineer.com Reference: ANDREWS REACH EXPRESS APPLICATION PACKAGE ❑Original will follow via mail Comments: Cameron, ■Original will NOT follow via mail Thanks for cmailing me that cover sheet. I have completed it and attached the narrative and vicinity map. Please consider for a review date asap. Call me if you have any questions. 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I?,, Caolj (A/4AVE� RE: N 11 WE ARE SENDING YOU ❑ Attached '4 Under separate cover via 0_hatD DEc,JER- the following items: ❑ Shop drawings ❑ Prints ❑ Plans ❑ Samples ❑ Specifications ❑ Copy of letter ❑ Change order ❑ COPIES DATE NO. DESCRIPTION 114i l SerS PAe-" 1E 1 ppa.,..KtTarl ->r SutP� I4A�DOF94rcN[ ggnST[aCTuS (2 ,V*AA-4T% THESE ARE TRANSMITTED as checked below: yi For approval ❑ For your use ❑ As requested LY For review and comment ❑ FORBIDS DUE ❑ Approved as submitted ❑ Approved as noted ❑ Returned for corrections U ❑ Resubmit copies for approval ❑ Submit copies for distribution ❑ Return corrected prints ❑ PRINTS RETURNED AFTER LOAN TO US Pia ME'Ro N Fes` -c�a�r 'TRIuK 12tYiEu Tew/.e¢a.ow, ram.., 1,,./L?DrSrIoNS COPY TO SIGNED: It enclosures are not as noted, kindly notify us at once. �..iJ ic\fv li•ti.. .. ..1�4 ! ma2deslmz�e �� S�F(n�� huh aS d eve (off$- so �wZ �� - h Ile 3. Ax s;&LQ iQ2G'1;'Wc-) SY//l 4-. P=rr Pew4<4: ! 5ic/e fv ha� �-ez- 5 50-2 Leos hee4 6 he /,�P�✓� �iae z Z r sep &P-z6 t:, 050414 NCDENR North Carolina Department of Environment and Natural Resources 127 Cardinal Drive, Wilmington NC 28405 (910) 395-3900 FAX (910) 350-2004 Request for Express Permit Review FILL-IN all information below and CHECK required Permitis). FAX or emall to Cameron. WeaverAncmaflnet along with a narrative and vicinity map of the project location. Projects must be submitted by 9.00 A.M. of the review date, unless prior arrangements are made. APPLICANT Name Kirk Andrews Company County New Hanover PROJECT Name Andrew's Reach PROJECT LOCATED IN Cape Fear RIVER BASIN Company Stroud Engineering.P.A. Address 102 D Cinema Drive City/State Wilmington, NC Zip 28405 County New Hanover Phone 910-815-0775 Fax 910-815-0593 Email zshipmantao)stroudengineer.com ❑ STREAM ORIGINATION CERTIFICATION, Stream Name ® STORMWATER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other ❑ Low Density -Curb & Gutter ® High Density -Infiltration ❑ Off Site ❑ COASTAL ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information MANAGEMENT ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront ❑ LAND QUALITY ❑ Erosion and Sedimentation Control Plan with acres to be disturbed. ❑ WETLANDS (401) ❑ No Wetlands on Site (letter from COE) ❑Wetlands Delineated/No JD ❑ Greater than 0.1 AC Wetlands Impacted ❑Jurisdictional Determination has been done ❑ Less than 0.1 AC Wetlands Impacted ❑Greater than 0.5 AC Wetlands Impacted The legislation allows additional fees, not to exceed 50% of the original Express Review permit application fee, to be charged for subsequent reviews due to the insufficiency of the permit applications. For DENR use only SUBMITTAL DATES: Fee Split for multiple permits: SW $ CAMA $ LQS $ 401 $ Total Fee Amount $ I 'd 91EO'IN N'd 'DNI833NIDN3 00081S NVH:6 SOOZ '9 *1dV PROJECT NARRATIVE Project Summary The purpose of this project is to construct 40 single family residences on the subject 27 acre site. The site is bounded to the west by the salt marsh of Bridges Creek and to the east by Masonboro Loop Road. The project falls within the jurisdiction of the City of Wilmington Planning and Zoning Department. Up to 18 multi -family units are proposed as future development but will not be constructed at this time. Adjoining Property Property adjoining the site is primarily residential in nature. A mixed use development is currently being constructed across from Masonboro Loop Road from the site. Soils Soils on site are mapped in the New Hanover County Soil Survey primarily as Craven, however small pockets of Lakeland and Seagate soils also exist on site. Please note that there has been some previous discussion with NCDENR representatives concerning the soils on this site. A full report outlining infiltration rates and soils will be submitted with project plans. Proposed Stormwater Management Practices Stotmwater will be collected via a system of catch basins and conveyed to several dry City detention basins. From there, stormwater will be drawndown through the basin outlet structure and piped to an additional junction node where it will enter a 36" perforated pipe in an infiltration trench. This trench will dictate that the first inch and a half of rainfall be infiltrated per State requirements. A outlet structure will provide for the release of stormwater in excess of the design storm into the adjacent wetlands. The conceptual layout of the site seeks to minimize the impact on the natural drainage features on the site and provide an environmentally friendly design. S 'd 9CR'IN 'V'd 'DNIHAIDN3 O KS WV6Z 6 SOOZ '9 '1IV r. t TO MARKET STREET -0 WRIGHTSVILLE BEACH TO CAROLLINA BEACH I NOT TO SCALE 8-9CE0'°N 'V'd '9NIN33NION3 UGHS PHI S00Z '9 ',dV s STROUD ENGINEERING, P.A. Date: 4/6/05 Number of Pages 4 To: NCDENR ATTN: CAMERON WEAVER Telephone Number: Facsimile Number: 350-2004 E-Mail Address: FACSIIV ME TRANSN=AL From: ZAK SHIPMAN Telephone Number: 910-815-0775 Facsimile Number: 910-815-0593 &Mail Address: zshipman@stroudengineer.com Reference: ANDREWS REACH EXPRESS APPLICATION PACKAGE ❑Original will follow via mail Comments: Cameron, ■Original will NOT follow via mail Thanks for emailing me that cover sheet. I have completed it and attached the narrative and vicinity map. Please consider for a review date asap. Call me if you have any questions. Thanks Zak -Please call if you experience trouble with this transmittal- 1 'd 9LP'IN 'tl'd '9NIa33N19N3 DAMS AVE:6 Soot '9 'Jdtl T NCDENR North Carolina Department of Environment and Natural Resources 127 Cardinal Drive, Wilmington NC 28405 (910) 395.3900 FAX (910) 350-2004 Request for Express Permit Review FILL-IN all information below and CHECK required Permit(s). FAX or email to Cameron.Weaver(ftcmail.net along with a narrative and vicinity map of the project location. Projects must be submitted by 9:00 A.M. of the review date, unless prior arrangements are made. APPLICANT Name Kirk Andrews Company County New Hanover PROJECT Name Andrew's Reach PROJECT LOCATED IN Cape Fear RIVER BASIN ENGINEER/CONSULTANT Company Stroud Engineering P.A. Address 102 D Cinema Drive City/State Wilmington, NC Zip 28405 County New Hanover Phone 910-815-0775 Fax 910-815-0593 Email zshipman(istroudengineer.com ❑ STREAM ORIGINATION CERTIFICATION; Stream ® STORMWATER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other ❑ Low Density -Curb & Gutter ® High Density -Infiltration ❑ Off Site ❑ COASTAL ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information MANAGEMENT ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront ❑ LAND QUALITY ❑ Erosion and Sedimentation Control Plan with acres to be disturbed. ❑ WETLANDS (401) ❑ No Wetlands on Site (letter from COE) ❑Wetlands Delineated/No JD ❑ Greater than 0.1 AC Wetlands Impacted ❑Jurisdictional Determination has been done ❑ Less than 0.1 AC Wetlands Impacted ❑Greater than 0.5 AC Wetlands Impacted The legislation allows additional fees, not to exceed 50% of the original Express Review permit application fee, to be charged for subsequent reviews due to the insufficiency of the permit applications. For DENR use only SUBMIT AL�JDATES: Fee Split for multiple permits: SW II�� CAMA $ LQS $ 401 _ $ Total Fee Amount $ Z 'd 9LE0'°N 'V'd '9NH33N19N3 ON0f1S WVBZ 6 SOOZ '9 ')dV PROJECT NARRATIVE Project Summary The purpose of this project is to construct 40 single family residences on the subject 27 acre site. The site is bounded to the west by the salt marsh of Bridges Creek and to the east by Masonboro Loop Road. The project falls within the jurisdiction of the City of Wilmington Planning and Zoning Department. Up to IS multi -family units are proposed as future development but will not be constructed at this time. Adjoining Property Property adjoining the site is primarily residential in nature. A mixed use development is currently being constructed across from Masonboro Loop Road from the site. Soils Soils on site are mapped in the New Hanover County Soil Survey primarily as Craven, however small pockets of Lakeland and Seagate soils also exist on site. Please note that there has been some previous discussion with NCDENR representatives concerning the soils on this site. A full report outlining infiltration rates and soils will be submitted with project plans. Proposed Stormwater Management Practices Stormwater will be collected via a system of catch basins and conveyed to several dry City detention basins. From there, stormwater will be drawndown through the basin outlet structure and piped to an additional junction node where it will enter a 36" perforated pipe in an infiltration trench. This trench will dictate that the first inch and a half of rainfall be infiltrated per State requirements. A outlet structure will provide for the release of stormwater in excess of the design storm into the adjacent wetlands. The conceptual layout of the site seeks to minimize the impact on the natural drainage features on the site and provide an environmentally friendly design. E d 9CEO'IN 'V'd 'HH33N19N3 0AMS NN6b:6 SOOT '9 ,dy r. t TO MARKET STREET 0 WRIGHTSVKIE LEACH TO CAROLINA BEACH NOT TO SCALE d-9CE0'IN 'V'd '9N1833N19N3 QO01V1S OH:6 SOH '9 ''°V s STROUD ENGINEERING, P.A. Date: 4/6/05 Number of Pages 4 To: NCDENR ATTN: CAMERON WEAVER FACSEMLE TRANSM TTAL From: ZAK SHIPMAN, Telephone Number: Telephone Number: 910-815-0775 Facsimile Number: 350-2004 Facsimile Number: 910-815-0593 E-Mail Address: E-Mail Address: zshipman@stroudengineer.com Reference: ANDREWS REACH EXPRESS APPLICATION PACKAGE ❑Original will follow via mail Comments: Cameron, ®Original will NOT follow via mail Thanks for emailing me that cover sheet. I have completed it and attached the narrative and vicinity map. Please consider for a review date asap. Call me if you have any questions. Thanks Zak -Please call if you experience trouble with this transmittal- t e 9LEO IN V'd '9N1fl3N1W 00051S AM:6 SOOZ '9 .adV ENGINEERING CONSULTING SERVICES, LTD. Geotechnical • Construction Materials • Environmental March 31, 2005 Mr. Kirk Andrews Footings of Wilmington, Inc. 3129 Braemar Lane Wilmington, North Carolina 28409 Subject: Field Infiltration 'resting Masonboro Loop Rd — Additional Infiltration Test Wilmington, North Carolina ECS, Ltd. Project No. 11276 Dear Mr. Andrews: Engineering Consulting Services, Ltd. (ECS) performed additional infiltration tests for the proposed site located at the intersection of Masonboro Loop Road and Masonboro Sound Road in Wilmington, North Carolina. ECS has previously performed and presented a report of hand auger borings and infiltration test for the subject site. The results of this evaluation were presented in a report dated July 29, 2004. This letter, with attachments, is the report of our additional testing. Field Investigations On March 25, 2005, Mr. William Cromartie of ECS met with a representative of Stroud Engineering, PA at the subject site. The representative of Stroud Engineering, PA identified the locations of the additional hand auger borings and infiltration tests. ECS conducted an investigation of the Subsurface soil and ground water conditions at the requested locations. The purpose of our investigation was to determine the subsurface soils and the infiltration rate of the subsurface soils. We observed the subsurface soil and ground water conditions by drilling fifteen hand auger borings to a depth ofapproximately 7 feet below the existing ground surface. We visually classified the subsurface soils and performed three infiltration tests at the hand auger boring locations B-2, B-8 and B-14. The attached Infiltration Evaluation sheet provides a summary of the subsurface conditions encountered at the hand auger boring locations and the result of our infiltration tests. Our field classifications indicate that the subsurface soils at the hand auger boring locations consisted of topsoil, tan -gray silty sands, gray -tan silty sands, gray silty sands, gray -orange silty sands, gray -orange clayey sands, orange -gray clayey sands, orange -gray clays and gray -orange clay to a depth of 84 inches. Ground water was encountered at depths ranging from 54 to 84 inches below existing site grades. The infiltration tests were conducted at 78 inches below existing site grades as requested by Mr. Jimmy Fentress of Stroud Engineering, PA. 'rhe results of the tests are summarized on the attached Infiltration Evaluation sheet and listed below. 7650 Market Street, Wilmington, NC 28411 (910) 686-9114 FAX (910) 686-9666 www.ecslimited.com Infiltration Evaluation Masonboro Loop Rd —Additional Infiltration Test Wilmington, North Carolina ECS, Ltd Project No. 22.11276 Our field test results at location B-2 indicated an infiltration rate of 0.08 inches per minute (4.5 inches/hour). At location B-8, the infiltration rate was 0.06 inches per minute (3.75 inches/hour). At location B-14, the infiltration rate was 0.1 inches per minute (6.0 inches/hour). Evalualious Based on observations in the hand auger borings, the lower stratum of relatively free -draining silty fine to medium sands is expected to have infiltration rates considerably greater than the controlling infiltration rate for the shallower soils. It is also likely that the seasonal high groundwater conditions and infiltration rates can vary across the site due to naturally occurring soil type and because of the surface topography. If you have any questions regarding this report, please contact us at (910) 686-91 14. Respectfully, ENGINEERING CONSULTING SERVICES, LTD. W l lr-t) vto" Winslow Goins, F.I. Staff Engineer CC: Jinnrny Fentress, Stroud Engineering, PA Attachments: Site Sketch Infiltration Evaluation Sheet MM 22983 Walid M. Sobh, _ E. F a �d Principal Enginee'r.,�9�•:yGIWE NC License No8r3;�O B-a , 13 J� 12 \ / 11 B_6 10 9 8 14 \� r�7 15 19 F] 9 23 I 24 \ 25 27 Cal 26 29 I 30 1 31 32 3 T 33 1 34 / DENOTES APPROXIMATE LOCATION OF HAND AUGER BORING / ®DENOTES APPROXIMATE LOCATION OF HAND AUGER BORING AND INFILTRATION TEST N SCALE (IN FEET) 50 100 160 0 REFERENCE: SITE PLAN PROVIDED BY STROUD ENGINEERING, PA IN ELECTRONIC FORMAT N " FCs s -E LTD 35 ENGINEERING CONSULTING SERVICES,LTD FIGURE 1 HAND AUGER BORING ANI INFILTRATION LOCATION MAP NEW HANOVER COUNTY WILMINGTON, NORTH CAROLINA PROJECT NO. 22-11276 DRAWN BY/DATE WEG/03-30-05 CHECKED BY/DATE FILENAME: FIGS