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HomeMy WebLinkAboutSW8991244_COMPLIANCE_20100309STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW g:? DOC TYPE ❑CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE „�FjIDO� YYYYMMDD RCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Dee Freeman Governor Director Secretary March 9, 2010 Keith Walsh, President W. Keith Walsh, LLC P. 0. Box 12-OV Swansboro, NC 28584 Subject: NOTICE OF INSPECTION - Sneads Ferry Main Post Office Permit No. SW8 991244 Onslow County Dear Mr. Walsh-. On January 26, 2010, Vincent Lewis of the Wilmington Regional Office of the Division of Water Quality (DWQ) inspected Sneads Ferry Main Post Office in Onslow County to determine compliance with Stormwater Management Permit Number SW8 991244 issued on February 24, 2000. DWQ file review and site inspection revealed that the site is not compliant with the terms and conditions of this permit. Please find a copy of the completed form entitled "Compliance Inspection Report" attached to this letter, which summarizes the findings of the recent inspection. As indicated in the attached inspection report, the following deficiencies must be resolved: 1. Excessive vegetation in the pond and on side slopes including small trees. Please inform this Office in writing before April12, 2010, of the specific actions that will be undertaken and the time frame that will be required to correct the deficiencies. Failure to provide the requested information, when required, may initiate enforcement action including the assessment of civil penalties of up to $10,000 per day. If a written plan of action is not submitted to this office by S4pril12,) (2010 then DWQ staff will re -inspect the site and issue a Notice of Violation if the listed deficiencies have not been addressed. Please be reminded that if any ownership or name change has occurred it is the permittee's responsibility to notify this office in writing. Note that during the file review for this stormwater permit, SW8 991244, a letter from your office was observed indicating that W. Keith Walsh, LLC is no longer the owner of the property. A further search was unable to find a change of ownership form transferring the permit to the new owner. Even if the property is under new ownership W. Keith Walsh, LLC is still responsible for the operation and maintenance of the stormwater pond and maintains ownership of the stormwater permit until the permit is transferred. Wilmington Regional Office One 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 NorthCarotlna Phone: 910-796-72161 FAX: 910-350-2W41 Customer Service: 1-877-623-6749 ��������� Internet: www.ncwaterquality.org Permit No. SW8 991244 If the stormwater permit has been transferred pleas provide the necessary documentation supporting the transference. If the stormwater permit has not been transferred to the new owner and this is the desire of W. Keith Walsh, LLC you may find the "State Stormwater Name/Ownership Change Form" format the link below: http://portal. ncdenr.org/web/wq/ws/su/statesw/forms_docs If you have any questions please contact me at the Wilmington Regional Office, telephone number (910) 796-7215. Sincerely, c v> Chris Baker Environmental Engineer Enclosure: Compliance Inspection Report GDSlcsb: S:IWQSISTORMWATERIINSPECT1991244.mar10 cc: John Hennessy-NPS-ACOU WiRO Files DWQ Central Files Compliance Inspection Report Permit: SW8991244 Effective: 02/24/00 Expiration: County: Onslow Region: Wilmington Contact Person: W Keith Walsh Title: President Directions to Project: Type of Project: State Stormwater - HD - Detention Pond Drain Areas: 1 - (Everett Creek) (03-05-02) ( SA;HQW) On -Site Representative(s): Related Permits: inspection Date: 01/26/2010 Entry. Time: 12:50 PM Primary'lnspector: Vincent Lewis Secondary Inspector(s): Christopher Baker Reason for inspection: Routine Permit Inspection Type: State Stormwater Facility Status: Q Compliant ® Not Compliant Question Areas: BE State Stormwater (See attachment summary) Owner: W Keith Walsh LLC Project: Sneads Ferry Main Post Office Exit Time: 01:20 PM Phone:910-326-7000 Phone: Phone: Inspection Type: Stormwater Page: 1 Permit: SW8991244 Owner - Project: W Keith Walsh LLC Inspection Date: 01/26/2010 Inspection Type. Stormwater Reason for Visit: Routine Inspection Summary: Deficiencies: 1. Excessive vegetation/small trees in pond and side slopes. To bring into compliance: 2. Cut and remove small trees and mow side slopes to a maximum of 6" in height. - Operation and Maintenance Yes No NA NE Are the SW measures being maintained and operated as per the permit requirements? ❑ ®❑ ❑ Are the SW BMP inspection and maintenance records complete and available for review or provided to DWQ ❑ ❑ ® ❑ upon request? Comment: Excessive vegetation/small trees in pond and side slopes. File Review Yes No NA NE Is the permit active? ® ❑ ❑ ❑ Signed copy of the Engineer's certification is in the file? ®❑ ❑ ❑ Signed copy of the Operation & Maintenance Agreement is in the file? ®❑ ❑ ❑ Copy of the recorded deed restrictions is in the file? ®❑ Q ❑ Comment: SW Measures Yes No NA NE Are the SW measures constructed as per the approved plans? a ❑ ❑ Are the inlets located per the approved plans? ® ❑ ❑ ❑ Are the outlet structures located per the approved plans? ® ❑ ❑ ❑ Comment: Other Permit Conditions Yes No NA NE Is the site compliant with other conditions of the permit? ® Q ❑ ❑ Comment: Other WQ Issues Yes No NA NE Is the site compliant with other water quality issues as noted during the inspection? ®❑ ❑ ❑ Comment: - Built Upon Area Yes No NA NE Is the site BUA constructed as per the permit and approval plans? ®❑ ❑ ❑ Is the drainage area as per the permit and approved plans? ❑ ❑ ❑ Is the BUA (as permitted) graded such that the runoff drains to the system? ❑ ❑ ❑ Comment: Page: 2 COMPLIANCE STUDY REQUIREMENTS ,�J- ETENTION POND Project Name: S 11 e - Permit No. 7�/Z '_ - . e,,: _ -- _ GPS Position: O N 1. --Y N 2. Y (fN:) 4. Y N 5. —1'---N_. 6. —Y—N 7. N 8, G N 9. N� GIB) 11. I� 12. Y. (aV) 13. N 15. [yam N 15. Y —N-- 46. YN C N N N Y Y N -0 N Y N Y N Comments: 17, 18. 19. 20, 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. Does the plan show the proposed contours, spot elevations, and finished floor elevations (if applicable)? Is the Mean High Water -Line shown on the plans, if applicable? Local Jurisdiction vG1�____�___ Name, mailing address & phone number of permittee, developer or current owner Do we have a copy ofthe recorded Deed restrictions with all required statements? (Applies to subdivisions, outparcels, future development, etc.) If the development is a subdivision, has the lot BUA been complied with? Is the amount of the BUA in accord with the approved plans? Check dimensions of buildings, parking, sidewalks, roads, etc. Is the location of the BUA in accord with the approved plan? Is the grading of the BUA in accord with the approved plan? Is there any additional BUA not shown on the approved plan? Is the Drainage Area to each system per the approved plans? Is there any off -site drainage that has not been accounted for? Observe the perimeter of the project for offsite flow or piping. Is the permanent pool surface area per the approved plans (approx) Is the shape of the pond per the plans? (i.e., area, 3:1 L:W ratio) Has a Vegetated filter been provided at the outlet if the 85% TSS chart was used, and is it constructed per the plan and stabilized with grass? Is a Forebay provided? (Ponds permitted prior to September, 1995 will not have forebays.) Does all the runoff from the parking & roofs ultimately drain into the forebay? Check the backs of buildings to verify roof drainage. Are the Inlets located per the approved plans, such that no short-circuiting occurs? Does the pond have a 6:1 sloped Vegetated shelf located below permanent pool? (Ponds permitted prior to September 1995 will not have a shelf.) Is the shelf profusely planted with wetlands plants? 1 2 3 P 5 Do the slopes have sufficient permanent grass cover? 1 2 3 4 5 Does the pond have a 3:1 slope above the permanent pool? Is the Outlet structure with trash rack and orifice provided and located per the approved plans? Are the Orifice and overflow invert elevations per the approved plans? Measure the relative distance between them. Has the Designer's Certification been submitted? Has a water sample been taken at the outlet? What is the soil type (from County Soils Maps) The consulting company that prepared the plans? Are there any violations? Previously inspected? COMPLIANCE STUDY REQUIREMENTS INFILTRATION SYSTEMS Basins and Trenches 1 , 1 TECHNICAL SPECIFICATIONS 1 FOR STORNIWATER DETENTION POND ' TO SERVE t SNEADS FERRY MAIN POST OFFICE Onslow County, North Carolina 1 OWNER: W. Keith Walsh, LLC Swansboro, North Carolina STORMWATER D.ECEMBER 1999 1 E C E I V E 231999 �J ,•°`�0.��(C/}. %� �•,'tti�i �DEC PROS IA, 57i PARKER & ASSOCIATES INC. 1. Engineering -� - and Planning ��y` rT,°°rrr, P.O. Box 97gurveying r►FFf,,oi Jacksonville, North Carolina 28541 910-455-2414 1 i 1. i open fight © 7 999 l}y ?'arlier s; A sociaies, Ina, All rights reserved. No }part of this document may. be ; eproauced in any fa.r"n or by any ,-r eajzs without priat ,vrittell Permicsinn Use of this document, excLpt by those expressly authorized, is strictly Prohibited. u 0 0 PROJECT INFORMATION SHEET OWNER: W. Keith Walsh, LLC 666 West Corbett Avenue P.O. Box 1208 Swansboro, North Carolina 28584 Contact Person: Mr. W. Keith Walsh, President (910) 326-7000 ENGINEER: Parker & Associates, Inc. P. O. Box 976 Jacksonville, NC 28541-0976 Contact Person: Timothy M. Stewart, P.E. (910) 455=2414 SNEADS FERRY POST OFFICE STORMWATER DETENTION POND GENERAL REOUIREMENT 1. Summary of Work 2. Field Engineering 3. Submittals 4. Testing Lab Services 5. Inspection/Certification 6. Guarantee of Work SITE WORK . . . . . . . GR 1 - 4 1. Clearing and Grubbing 2. Excavation and Grading 3. Dewatering 4. Backfill 5. Piping System 6. Grassing 7. Erosion and Sediment Control.Measures DWO STORMWATER APPLICATION AND SUPPLEMENT S70RMWATER NARRATIVE . . . . . . . . . . ENGINEERING CALCULATIONS . . . . . . . . sw 1 - 5 4 1 ENG 1 _ 5 ' GENERAL REQUIREMENTS 1. SUMMARY OF WORK ' The CONTRACTOR for this section shall furnish all materials, supplies, equipment, labor, tools and all other incidentals ' necessary to construct the Stormwater Detention Pond and appurtenances, complete, and ready for use, as shown on the plans and as enumerated herein. t Work necessary for the construction of the Stormwater Pond includes but is not limited to clearing and grubbing, dewatering, excavation, backfill, install piping system, ' grassing, and erosion control as shown on the plans and as outlined hereinafter. ' 2. FIELD ENGINEERING A. OWNER will establish base lines for Project and a site benchmark for use by the CONTRACTOR. OWNER will furnish ' boundary surveys if required. B. CONTRACTOR shall: ' 1. Develop and make all detail surveys and measurements _needed _for construction including slope stakes, batter boards, and all other working lines, ' elevations and cut sheets. .2. Be solely responsible for all locations, dimensions and levels. No data other than written orders of ' the ENGINEER shall justify departure from the dimensions and levels required by the Drawings. 3. Safeguard all points, stakes, grade marks, monuments and bench marks made or established on the Work, re- CJI. GJJ11J11 JC.LIIIV 11 d1J1.. I..Ll xJ l:. \.l L111U 1c c 1...11Y C:Al I 11 YYV1J\ improperly installed because of not maintaining, not protecting or removing without authorization such established points, stakes, marks and monuments. ' 4. When requested by ENGINEER, provide such facilities as may be necessary for ENGINEER to check line and ' grade points placed by CONTRACTOR. Where applicable, CONTRACTOR shall do no excavation or embankment work until cross -sectioning necessary for determining pay quantities has been completed and I checked by ENGINEER. 1 1 GR-2 ' 3. SUBMITTALS The CONTRACTOR shall a minimum of three (3) copies of ail submittals of the various materials and products to the ENGINEER for approval. Of these, one (1) copy will be returned to the CONTRACTOR. ' Each set of submittals shall include but not be limited to: 1. Drawings showing all dimensions units and locations of ' all other accessory equipment, including a piping layout. 2. All technical information needed by the ENGINEER to determine if the proposed equipment meets the plans and 1 specifications. 4. TESTING LAB SERVICES ' A. General: Testing of materials, testing for .moisture content during placement and compaction of fill ' materials, and of compaction requirements for compliance with technical requirements of the -specifications shall be performed by a testing laboratory. ' B. Testing Services: 1. Test the CONTRACTOR'S proposed materials in the laboratory and/or field for compliance with the ' specifications. ' 2. Perform field moisture content and density tests to assure that the specified compaction of backfill materials has been obtained. I 3. Report all test results to the ENGINEER and the CONTRACTOR. ' C. Authority and Duties of Testing Agency: Technicians representing the testing laboratory shall inspect the materials in the field and perform tests, and shall report their findings to the ENGINEER and the CONTRACTOR. ' When the materials furnished or work performed fails to fulfill specification requirements, the technician will direct the attention of the ENGINEER and CONTRACTOR to ' such failure. The technician shall not act as foreman or perform other ' duties for the CONTRACTOR. work will be checked as it progresses, but failure to detect any defective work or materials shall not in any way prevent later rejection when such defect is discovered, nor shall it obligate the ' ENGINEER for acceptance. Technicians are not authorized to revoke, alter, relax, enlarge, or release any requirements of the specifications, nor to approve or ' accept any portion of the work_. I GR-3 ' D. Responsibilities and Duties of CONTRACTOR: The use of testing services shall in no way relieve the CONTRACTOR ' of his responsibility to furnish materials and construction in full compliance with the drawings and specifications. ' To facilitate testing services, the CONTRACTOR shall: 1. Secure and deliver to the testing agency, without cost, preliminary representative samples of the ' materials he proposes to use and which are required to be tested. 2. Furnish such casual labor as is necessary to obtain and handle samples at the project or at other sources of material. 1 3. Advise the testing agency sufficiently in advance of operations to allow for completion of quality tests ' and for the assignment of personnel. 5. INSPECTION CERTIFICATION ' Inspection by an ENGINEER is required in order to issue the Certification of Construction as required by the Division of Water Quality to assure the pond is built according to the ' plans and specifications. Parker & Associates, Inc., as ENGINEER, if authorzed by the OWNER, this Contract. will provide inspection throughout the performance of Inspections will be made periodically or on a full time basis as the work progresses to insure compliance with these specifications and with the specification ' requirements shown on the plans. when requested by the ENGINEER, CONTRACTOR shall provide his services to insure to the ENGINEER's satisfaction that all dimensions, lines and ' grades are as designed. In order for the ENGINEER. to adequately inspect and approve this construction, testing services shall be provided by an approved testing laboratory. ' 6. GUARANTEE OF WORK ' A. Except as otherwise specified, all work shall be guaranteed by the CONTRACTOR and his sureties against defects resulting from the use of faulty or inferior ' materials, equipment, or workmanship for 12 months from the date of final completion of the work as signified by acknowledgement of receipt of Final Payment by the CONTRACTOR. B. If, within any guarantee period, repairs, or changes are required in connection with guaranteed work, which, in 1 Lhe opinion of she ENGINEER, are rendered necessary as 1 GR-4 the result of the use of materials, equipment, or ' workmanship, which are inferior, defective, or not in accordance with the terms of the CONTRACT, the CONTRACTOR ' shall, promptly upon receipt of notice from the OWNER, and without expense to the OWNER: 1. Place in. satisfactory condition, in every ' particular, all of such guaranteed work. 2. Correct all defects -therein. ' 3. Make good all damage to the site, which in the opinion of the ENGINEER, is the result of the use of ' materials, equipment, or workmanship which are inferior, defective, or not in accordance with the terms of the CONTRACT. 4. Make good any work or material, or the equipment and ' contents of said building site, disturbed in .fulfilling any such guarantee. ' C. if in fulfilling the requirements of the CONTRACT or of any guarantee embraced therein or required thereby, the CONTRACTOR disturbs any work guaranteed under another ' CONTRACT, he shall restore such disturbed work to condition satisfactory to the ENGINEER, and shall guarantee such restored work to the same extent as it was ' guaranteed under such other CONTRACT. D. If the CONTRACTOR, after notice, fails to proceed promptly to comply with the terms of the guarantee, the OWNER may have the defects corrected and the CONTRACTOR and/or his Surety shall be liable for all expenses incurred. ' E. All special guarantees applicable to definite parts of the work that may be stipulated in the specifications or other papers forming a part of the CONTRACT shall be subject to the terms of this section during the first year of the life of such special guarantee. 1 ISITE WORK CLEARING AND GRUBBING Clearing shall consist of the cutting, removal, and ' satisfactory disposal of all trees, down timber, project roots, stumps, lap wood rubbish, trash, and all other objectionable material within the construction limits as directed. Any specific trees or shrubs designated to be saved by the OWNER shall be protected from injury during construction. Grubbing shall consist of the excavation, removal, and disposal of all stumps, roots, logs, and other perishable and objectionable material within the construction limits as directed. All clearing and grubbing shall be accomplished in such a manner as not to injure or destroy any merchantable timber or ' other property on land adjacent to the project site. Before any burning of debris shall occur, contractor shall contact owner and engineer for permission and location and ' contractor will be required to secure ANY and ALL burning permits required. All perishable material shall be burned in ' such a -manner as not to injure trees or shrubs outside the project site or any tree or shrub designated to be saved. Any material that cannot be completely burned will be removed and disposed of at an off -site location at the expense of the contractor. If burning is not allowed, contractor is responsible to remove all material from the site. 2. EXCAVATION AND GRADING All grading and excavation shall be in accordance with typical dimensions and cross -sections shown on the plans and ' specifications contained herein. During excavation all topsoil suitable for reuse shall be ' stockpiled in an area designated by the OWNER. All soils suitable for reuse as backfill material shall be stockpiled in a separate area designed by OWNER. All soils unsuitable for ' reuse shall be stockpiled in a separate location as designated by the OWNER. Services of the testing laboratory shall be used to determine which soils are best suitable for reuse as backfill. 1 In areas requiring back fill to construct the pond dikes, a minimum of 12-inches of topsoil and subsoil stripping shall ' occur prior to the commencement of backfill. 1 SW-2 3. DEWATERING 1. The CONTRACTOR shall provide and maintain adequate ' dewatering equipment to remove and dispose of all surface and ground water entering excavations, trenches, or other parts of the work. Each excavation shall be kept dry during subgrade preparation and continually thereafter ' until the structure to be built, or the pipe to be installed therein is completed to the extent that no damage from hydrostatic pressure, flotation, or other ' cause will result. A. The working areas on the site (exclusive of sediment entrapment devices) shall be kept free of surface water at all times. The CONTRACTOR shall install drainage ditches and dikes and shall perform all pumping and other work necessary to divert or remove ' rainfall and all other accumulations of surface water from the excavations and fill areas. The diversion and removal of surface eater shall be ' performed in a manner that will prevent the accumulation of water behind temporary structures or at any other locations within the construction area where it may be detrimental. ' D. water used for working or processing, resulting from dewatering operations, or containing oils or sediments that will reduce the quality of the water ' sediments that will reduce the quality of the water downstream of the point of discharge shall not be ' directly discharged. through a settling Such basin waters shall be diverted or filter before being discharged. C. The CONTRACTOR is responsible for the condition of ' any pipe, conduit or channel which he may use for drainage purposes and all such pipes, conduits or ' channels shall be left clean and free of sediment. 2. The CONTRACTOR shall provide, install, and operate sufficient trenches, sumps, pumps, hose, piping, wellpoints, deep wells, etc., necessary to depress and maintain the ground water level below the base of the excavations during all stages of construction operations. The ground water table shall be lowered in advance of subgrade excavation and maintained two feet below the lowest subgrade excavation made until the structure has sufficient strength and weight to withstand horizontal and vertical soil and water pressures from natural ground water. The system must be operated on a 24-hour basis and standby pumping facilities and personnel shall be provided to maintain the continued effectiveness of the ' system. If, in the opinion of the ENGINEER, the water Levels are not being lowered or maintained as required by I SW-3 ' these specification, the CONTRACTOR shall install additional or alternate dewatering devices as necessary, at no additional cost to the OWNER. 4. BACKFILL After completion of stripping the area to receive embankment ' backfill and compaction, the CONTRACTOR shall place compacted backfill to construct the dikes for the stormwater pond in accordance with typical dimensions and cross -sections shown on ' the plans and requirements contained in the specifications herein. Any soft areas of subgrade containing unsuitable, wet or yielding material not readily capable of site compaction shall be removed and replaced with compacted select borrow material. Services of a testing laboratory shall be used to determine ' which soils are suitable as select borrow material. All fill shall be placed in horizontal loose lifts not ' exceeding 8--inches in thickness and shall be mixed and spread in a manner assuring uniform lift thickness after placing. Each lift shall be compacted by not less than two (2) complete coverages of the specified compactor. The compaction of the complete area of the backfill shall have i-minimum compacted density of 95 percent as obtained by test procedures -in ASTM D 1557 (modified proctor). Services of a testing laboratory ' shall be required to provide the CONTRACTOR with the required compaction density results to insure compliance with the above required compaction density. ' No fill material shall be placed when free water is standing on the surface of the area where the fill is to be placed. No compaction of fill will be permitted with free water on any portion of the fill to be compacted. No fill shall be placed or compacted in a frozen condition or on top of frozen material. Any fill containing organic materials or other unacceptable material previously described shall be removed and replaced with approved fill material prior to compaction. ' Each lift of compacted fill shall be compacted by the designated number of coverages of all portions of the surface of each lift by a smooth -drum vibratory roller for ' granular material having a static weight not less than 5,500 pounds, a sheepsfoot roller for cohesive material exerting a pressure of 250 psi on the surface of the feet, or equivalent ' equipment approved by the ENGINEER prior to commencement of the work. One coverage is defined as the condition obtained when subjected to the direct contact of the compactor. The compactor shall be operated at a forward speed not exceeding 40 feet per minute. SW-4 u 0 a s. � In some ares where soft soils are removed, it may be difficult to properly compact the first lift or two on the base of the undercut area. If the base is excessively wet, a working mat of compacted crushed stone shall be placed prior to placement and compaction of the fill. PIPING SYSTEM A. GENERAL The piping system required shall be constructed and installed as shown on the plans and as further described herein. The stormwater pond piping system shall include but not be limited to one 18-inch outlet pipe, one 18- inch riser pipe, one trash rack, an anti -seep plate and all appurtenances required for a complete installation. B. PIPING The piping included shall be to the diameters and lengths shown on the plans. These pipes shall be fabricated of corrugated aluminum made from alloys of ALCAD 3004 or 5052. They shall be helically corrugated Corlix as manufactured by Kaiser Aluminum or an approved equal. All welding required shall be done in the factory. The units shall arrive to the site ready for installation. Flanges shall be welded to the pipes for easy connections in the field. The flanges.shall be bolted together using 3/8-inch stainless steel bolts, nuts and washers and using 3/16-inch neoprene gaskets. A trash rack shall be provided to -the dimensions shown on the plan. The trash rack shall include an aluminum grate top with %-inch opening welded to the top. An aluminum anti -seep plate shall be provided and installed per the dimensions and locations shown on the plans. GRASSING A. DIKES AND EMBANKMENTS The CONTRACTOR after grading and shaping the dikes and remaining areas as shown on the plans, shall furnish labor, tools and equipment to till,and seed any and all areas, as outlined hereinbefore under site work. The entire area shall be given one application of agricultural lime at the rate of 2,000 pounds per acre; super phosphate at 500 pounds per acre; a 12-4-8 grade fertilizer at the rate of 600 pounds per acre, all harrowed to a point that it is thoroughly mixed with the I SW-5 soil. The Contractor shall then furnish and sow, Rebel ' Fescue seed, at the rate of 100 pounds per acre mixed with 25 pounds per acre of Bermuda. A suitable cover of straw mulch shall be placed at a rate of 1.5 to 2 tons per acre on the entire area following the entire area to prevent the straw much from blowing away and to assist in earlier germination. In the case of extreme- slopes, the straw mulch shall be stabilized by the application of an asphalt or other approved binding ' material. The Contractor shall guarantee a full stand of grass over the entire area. A stand of grass shall be considered ' acceptable when cover is at least 95 percent. 7. EROSION AND SEDIMENT CONTROL MEASURERS The erosion and sedimentation control measures shown on the plans and contained in the Contract Documents ' indicate the approximate locations of those measures on the basis of the existing topography within the area or on the basis of the predetermined need for any specific area. Upon commencement of the operations in those areas ' where measures are proposed, the ENGINEER may make minor adjustments in location. CONTRACTOR shall note and observe all conditions as outlined in the Erosion and ' Sedimentation Control Approval Letter. It will be the CONTRACTOR'S responsibility to provide the erosion and sediment control measures as shown on the plans or as otherwise specified in the Contract Documents or as directed by the Engineer. The CONTRACTOR is cautioned that these facilities will be installed as shown on the plans and/or as directed by the ENGINEER ' during the construction process. Any citations, penalties, or fines issued by the N.C. Department of Environment and Natural Resources or any other agency resulting from negligence of the CONTRACTOR shall hold the ENGINEER or OWNER harmless from any resulting damages or fines. k „ , OFFICE USE ONLY Date Received Fee Paid Permit Number State of North Carolina Department of Environment and Natural Resources Division of Water Quality I STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original t1. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): W. Keith Walsh, LLC 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): W. Keith Walsh, President ' 3.Mailing Address for person listed in item 2 above: 666 West Corbett'Street, Post Office Box 1208 City: $wansboro State: NC Zip: 28584 Telephone Number: ( 9 10 ) 3 2 6 -- 7 0 0 0 �^ ' 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Sneads Ferry Main Post Office 5. Location of Project (street address): NC Hwy 210 City: Sneads Ferry County: Onslow ' 6. Directions to project (from nearest major intersection): From intersection of NC Hwy 210, proceed east on Hwy 172, project is ' 1100 feet from intersection on the left 7. Latitude: N 3 4° 3?' 5 9" Longitude: W 7 7° 2 5' 5 4" of project ' 8. m Contact person who can answer questions about the project: Name: Keith Walsh Telephone Number: (910 ) 3 2 6- 7 0 0 0 II. PERMIT INFORMATION: ' L Specifv whether project is (check one): X New Renewal Modification 1=orm SIl U-101 Version 3.99 E a-C 1 of -1 ' 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number W Il A and its issue date (if known) ' 3. Specify the type of project (check one): Low Density y High Density Redevelop General Permit Other ' 4. Additional Project Requirements (check applicable blanks) — CAMA Major L_Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater• ' Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. 1 III:. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative ' (one to two pages) describing stormwate: management for the project. This project will have a stormwater_- detention pond I 1.1 2. Stormwater runoff from this project drains to the White 0 a k River basin. 3. 'Total Project Area: 1.77 acres 5. How many drainage areas does the project have? I 4. Project Built Upon Area: 55.4 % 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. 71is .5one ,SdI.Ys,.• e<"area,N7 4 a Area_. <:o an ^mx ­0 Receiving Stream Name £ yi� _, O t t Creek Receiving Stream Class SA Drainage Area 1.19 Existing Impervious* Area 0 Proposed Im ervious" Area 42,676 S. F. 0.98 acres % Impervious* Area (total) 8 2 % Im `envious* Sii>'faee Area ;� w DrainageAreal w DrauugeArea 2#r 3 On -site Buildings On -site Streets On -site Parking 32 5 00 S. F. On -site Sidewalks 2, 853 S. F. Other on -site 0 Off -site 0 Total: Total: " Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. 1 form SWU-10 1 Version 3.99 Page 2of4 ' 7. How was the off -site impervious area listed above derived? N / A 1 IV. DEED RESTIUCTIONS AND PROTECTIVE COVENANTS 1 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 _ N A _ _ 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 N / A square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood ' decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. ' 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. ' 5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. ' Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement J'onzi S%\A)!-101 versical 3.99 Page 3 of 4 ' VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be ' submitted to the appropriate DWQ Regional Office. 1. Please indicate that you have provided the following required information by initialing in the space ' provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form 1 M 5 •. One copy of the applicable Supplement Form(s) for each BMP Trn 5 Permit application processing fee of $420 (payable to NCDENR) Try S • Detailed narrative description of stormwater treatment/management w S • 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) ' VII. 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): Parker & Associates, Inc. Mailing Address: P.O. Box 976. 306 New Bridge Street City: Jacksonville, State: NC Zip: 28541 Phone: { 910 ) 455-2414 Fax: (910- ) 455-3441 ' VIII. APPLICANT'S CERTIFICATION I, (print or type name of person listed in -General Information, item 2) W � Keith Wa 1 s h certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 2H .1000. ��9L k4 Signature: L Date. 12- Zz-99 ' Form SWU-101 Version 3.99 Pabc 4 of 4 Permit No. f to be provided br DIVQ) State of North Carolina ' Department of Environment and Natural Resources Division of Water Quality ' STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This farm may be photocopied far use as an original ' DWQ Stormwater Management Plan Review: A complete stormwater� management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. L PROJECT INFORTNIATION Project Name: Sneads Ferry Main Post Office Contact Person: Keith Walsh Phone Number: (910 ) 3 2 6- 7 0 0 0 ' For projects with multiple basins, specify which basin.this worksheet applies to: N / A elevations Basin Bottom Elevation 41.0 ft. (floor of the basin) ' Permanent Pool Elevation n 5. 0 ft. (elevation of the orifice) Temporary Pool Elevation 46.0 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 5,953 sq. ft. (water surface area at the orifice elevation) ' Drainage Area 1 . 19 ac. (on -sire and off -site drainage to the basin) Impervious Area 0.98 ac. (on -site and off -site drainage to the basin) ' volumes 1 Permanent Pool Volume 8,748 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 5,411 cu. ft. (volume detained above the permanent pool) Forebay Volume 11905 cu. ft. (approximately 20% of total volume) Other parameters ' SA/DA I 7.45 (.surface area to drainage area ratio from DWQ table) Diameter of Orifice 1'. 0 in. (2 to 5 day temporary, pool drmv-down required) ' Design Rainfall .L . 0 in. Design TSS 1Zcm0va] ' 90 % (minimum SS %o required) I urin ti1Vt;-4!} Re%' ,3.99 I of 4 Footnotes: ' t lvhen using the Division SAMA tables. the correct SfUI}A ratio for permanent pool shirr" should be com rtued hased upon the b l o I 1 actual impervious I/c and permanent pool depth. Linear interpolation should be eniployed to determine the correct value for rwn- standard table entries. '- In the 20 coastal counties. the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal. The NCDE;NR 13ti-11' manual provides design tables for both 85%'17SS removal and 90% TSS rernoval. II. REQUIRED ITEMS CHECKLIST tThe following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment; Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. eInitial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. If a requirement has not been met, attach justification. ' Applicants Initials l5 a. The permanent pool depth is between 3 and b feet (required minimum of 3 feet). Tr+S b. The forebay volume is approximately equal to 20% of the basin volume. c. The temporary pool controls runoff from the design storm event. i� d. The temporary pool draws down in 2 to 5 days. NIA e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) ' Ten 5 f. The basin length to width ratio is greater than 3:1. T S g. The basin side slopes above the permanent pool are no steeper than 3:1. h. A submerged and vegetated perimeter shelf with a slope of 5:1 or less (show detail). i. Vegetative cover above the permanent pool elevation is specified. ��^ S j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. m. A mechanism is specified which will drain the basin for maintenance or an emergency. *K - owner is to record the easement at a later date. *11 - if basin ever needs to be drained , it will be pumped out. ' III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT 1 The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. ' "['his system (check one) 0 does Xdoes not incorporate a vegetated filter at the outlet. This system Wieck one) 0 does k does not incorporate pretreatment other than a forebay. Furni SWU• 102 Rev 3.99 Page 2 44 ' Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at least monthly: ' a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. wb. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 42 '0 feet in the main.pond, the sediment shall be removed. When -the ermanent pool depth reads 42 .0 feet in the forebay, the sediment shall be remove d. 1 BASIN DIAGRAM (fill in the blanks) v Permanent Pool Elevation 4 S 0,, Sediment Re oval El.E2. 75 0Sediment Removal Elevation 42' 0 75%Bottom Ele ation c�o------------------------------------------------c--- Bottom Elevation 41 . 0 2510 I FOREBAY MAIN POND ' 5. Remove cattails and other indigenous wetland plants when they cover 50°Io of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. ' 6. If the basin trust be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. t Form SWU-1!Q ka2%' 3.911 11ahe 3 of -4 1 ' 7. All c:oniponernts of the "vet detention basin systein shall be inaintained in good working order. 1 acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the systeni or responsible party. ' Print name.: 1V, Keith Walsh Title: president Address: 666 West Corbett Street P.O. 8oxr12O8 Swansboro NC 28584 Phone: ' Signatt I I 0 Date: / 2 - 2-2-- 9 T Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. g - t--�. , a Notary Public for the State of , County of _l`�rn Sl �� _ do hereby certify that 2►'�'b, i1�o.� 5 personally appeared before me this Z"Z day of -1)ee P �h � Ili 4 �, and acknowledge the. due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL ,My commission expires 2t 2Lo5oz tForm SWV-10- Rev 2.91) Page 4 of -I 1. SNEADS FERRY POST OFFICE ONSLOW COUNTY, NORTH CAROLINA STORMWATER DETENTION POND ENGINEERING CALCULATIONS Total Area within Boundary 1.77 Acres Total Area Draining to Pond from Building, Drives, and Parking Dot (including pond area)......... 1.19 Acres Impervious Area: Building,Drives & Parkin.g..42,676 SF = 0.98 Acres Percent Impervious = Impervious = 0.98 = 82 Total 1.19 2. PERMANENT POND SURFACE AREA From Chart 4 -- Appendix E from D.E.M. Report 87-05, for 85% impervious, 4.0 basin depth without Vegetative Filter (90% TSS Removal) Yields SA/DA = 7.45% 1.19 acres x 7.45% Top of permanent pond elevation is 45.0 Area at 45.0 elevation = 4,870 S.F. provided 4,a70 S.F. provided > 3,862 S.F. required 3. TEMPORARY DETENTION STORAGE )OT,IJMR Retain 11, of runoff from area draining to pond Total Area = 1.19 Acres Total Runoff = 1.19 Ac.-In. Find Temporary Storage Volume 1.19 Ac . - In . x 3,630 C.F. = 4,319 C _ F __ rPcztii.rQd Ac.-In. 4. ENG-2 Use 1.0 Ft. Temporary Pool Area at 45.0 elevation (permanent pond) = 4,870 SF Area at 46.0 elevation (temporary pond) = 5,953 SF Average Area = 5,411 F Storage Vol.= 5,411 S.F. x 1.0 Height = 5.411 C.F. provided 5. RELIEVE -TEMPORARY SMEAGR VOLUME IN 2 TO 9 DAYS Q = Cd A 2gh (orifice equation) Q = 4,319 C.F. 2 days = 0.0250 CFS Q = 4,319 C.F. _ 5 days = 0.012 CFS Cd = 0.60 g = 32.2 ft/sec h = 0.5 average height For 2 Day Release Solve For A = Q = 0.0250 = 0.00734 S.F. CD 2gh (0.6) V2 (32.2) (0.5) Solve for Orifice Diameter, D A = 0.00734 S.F. = ri Rz R = 0.048 ft. = 0.58 inch D = 1.16 inch Solve For A = Q = CD 2gh 0.012 (0.6) 2(32.2)(0.5) = 0.00352 S.F. ' ENG-3 ' Solve for Orifice Diameter, D A='0.00352 S.F. = n Rz ' R = 0.03347 ft. = 0.4017 inch D = 0.80 inch Use 1.0 inch diameter orifice 6. SIZE INLET BISER PIPE AND OUTLET PIPES TO HANDLE 10 YR. ,1-HRH ' STORm A. Storm Flow Q = CiA A = 1.19 acres ' C = 0.8 i = 2.88 in/hr - ten year, one hour Q = 0.8 (2.88) 1.19 = 2.7 cfs 7. Outlet Weir ' Water height before topping spillway = 47.0 - 46.0 1.0 Q = Cd A 2gh(orifice equation) Cd = 0.6 (typical valve) H = 1.0 ' A = 2 S.F. 2g = 64.4 Q = 0.6(2) 2(32-3)1.0 = 9.6 C.F.S. Q = 9.6 CFS 1 ENG-4 8. Cbeck Gravity Flow 18" Pipe Installed at 0.5% Use Manning's Equation M Q = 1.49 A R 2/3 S 1/2 n For 18" Pipe, Q = 3.7 CPS, which is greater than the 10 year - 1 hour flow Use 18" Pipe Q = CiA Composite C = 0.8 i1OO ` 4.15 in/hr for 100 year, 1 hr duration flood A = 1.19 Ac. Q = 0.8(4,15)(1,19) = 3.9_CFS A. Outlet Weir As Previously calculated, outlet weir can handle 9.6 CPS which is greater than 100 yr. flow B. Outlet Pike As calculated previously, outlet pipe will carry 3.7 CPS. Flowing full which is less than the 100 yr. flow, therefore, need emergency spillway also. C. ENG-5 Use Manning's Equation 1.0 ft. deep Trapezoidal Swale with 10 ft. wide bottom and 5:1 side slopes @ 5.0% Longitudal slope Use n = 0.06 for Grassed Swale Q = 68.0 CFS Total capacity of Spillway + Outlet Pipes = 68.0 + 3.7 71.7 CFS 71.7 CFS > 3.7 CFS Therefore will handle 100-yr. Storm 10. FO_REPAY VOLUME Forebay Volume shall contain a minimum of 20% of the total permanent pond volume. Volume of Permanent Pool 8,748 CF Forebay Volume Required 8,748 CF X 20% 1,750 CF Total Volume Provided 1,905 CF cZ:\specs\snd€rypo.caZ SNEADS, FERRY MAIN POST OFFICE Stormwater Narrative ' The New Sneads Ferry Main Post Office is being developed by W. Keith Walsh, LLC for the United States Postal Service. The project consists of one proposed building. The asphalt drives and parking ' areas will be constructed with curb inlet catch basins to collect stormwater and route it to the stormwater detention pond prior to releasing the stormwater runoff to the existing roadside ditch. The project drains into an unnamed tributary which flows into Everett Creek which is classified as SA waters. To determine if the unnamed tributary is SA waters, a stream sample was collected by ' Beachams Laboratory, at a point one-half mile downstream from the proposed pond. (See the attached lab report and vicinity map). The chloride content in the sample was 198 ppm which is below the limit of 500 ppm for SA waters. Therefore, the unnamed tributary is not SA waters, therefor a stormwater detention pond is allowed. ' For additional information, see the plans and specifications, and the rest of the permit application package. I 1RPi NCDEll 11.1 377,18 Rear_ham LaboratorN 1 20 ",i1[n.iii—on Highway Jacksonville, ..C; 251;4U RECEIVED REPORT OF ANALYSES DEC 2 1999 PARKER & A.SSOCIATF, ), 3'NC. PARKER ,306 :<F41 BRIDGE STREET DATE: 12/02/1.999 P.C. PDX 976 O1 N 5=ti]-C97b �fyAs� ASltn?TI.^':1. STEL•�ARTy` C}ILORIDE TESTING FOR NEW SNEADS FERRY POST OFFICE O:'age 1 of 1) SAMPLE DELIVERY TO LAP, LAD No. DATE TIME S.LN P L E R DATE Tl"',E M_,TRI\ �99�? 11/17:'99 153t f:OD ^:I]�E 11/17/99 1700 CLIENT LAB CUL- TSTATION ID NMBER PP1+1 PKR SNEADS FERRY PO CL- 59952 190 SAMPLE FROM TRIBUTARY OF EVERETTS CREEK 1/2 P;ILE+ N-NE OF INTERSECTION OF -HWY- 172 AND DUNN -ROAD. - ___.. LABORATORY DIRECTOR__ fli' � 3 S/k14 �1/rw/Ziven /S �4r+p24��/ 1 0...,(C) 1 v `� c L� Light ;. k',. _- r„� •'� mil � � • ?i ti e f`V I �r �?,� 1 f7llvJ�c r . SNEA01 �E/ln Pollocks /Snead !I Poir i �- r r 4y ✓' ,M ,i�,'rL� �`/ yJS IY/Ct' s I / Area B ridge /'rerryk k/ Lift �.��� __ •i 'i, .l am �/ i -. rl ;IF.I Ito) ' ;u / '--r �`.,' I/-:�/rF. _ � �' - '� ^:, � °Doh / '\'?;1 •� r t II'/ �'� 1 �� 1�j .: 1 !% �� �v �:✓ ; 4Ligy' (C) 4,Li h' L�Stone Ecc (C) u �r 1 r ' ��_ ./�.�_ _ }\`•i/i ,l',�'_ 1._ � � / ��/r,`1��., �.>,tir i � � / � trl; l �-=c;,='=—.k �. 1 �� �• :'%.�'��� i%� 1. 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