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HomeMy WebLinkAboutSW8910806_Current Permit_19911119 (2) ado- ,7 itit Ir. State of North Carolina Department of Environment, Health, and Natural Resources Wilmington Regional Office James G. Martin, Governor Bob Jamieson William W. Cobey,Jr., Secretary Regional Manager November 19, 1991 DIVISION OF ENVIRONMENTAL MANAGEMENT Mr. James F. Smith, Agent Blair Properties, Inc. Post Office Box 468 Wrightsville Beach, North Carolina 28480 Subject: Certification of Compliance with Stormwater Regulations Stormwater Project No. 910806 Pembroke at Landfall New Hanover County Dear Mr. Smith: This Certification is pursuant to the Stormwater Application for Pembroke at Landfall received on August 12, 1991, with additional information received on November 13, 1991. Based on our review of the project plans and specifications, we have determined that the stormwater control system complies with the Stormwater Regulations set forth in Title 15A NCAC 2H. 1003(i) . The runoff will be treated in three (3) detention ponds which are sized to achieve 90% reduction in Total Suspended Solids. Additionally, runoff from an area near the site entrance will be treated in 80 linear feet of exfiltration piping. This Certification shall be effective from the date of issuance until rescinded. The project shall be constructed and maintained in accordance with the final plans and specifications approved by the Wilmington Regional Office. A professional engineer must certify that the stormwater system has been installed in accordance with the approved plans and specifications. The attached certification should be received by this Office within 30 days of completion of construction. -Continued- 127 Cardinal Drive Extension,Wilmington,NC.28405-3845•Telephone 919-395-3900•Fax 919-350-2004 An Equal Opportunity Affirmative Action Employer Mr. Smith November 19, 1991 Page Two If you have any questions concerning this matter, please call Alexis Finn or me at (919) 256-4161. Sincerely, t --Da Adkin Water Quality Regional Supervisor Attachment DA/aif: 910806 .NOV cc: Keith Cooper Mr. Sky Conklin Alexis Finn Wilmington Regional Office Central Files DIVISION OF ENVIRONMENTAL MANAGEMENT Evaluation of Stormwater Treatment and Disposal System Draining to Waters Other Than Class SA PROJECT DATA Project Name: Pembroke at Landfall Project No. : 910806 Location (County, Township/Municipality, Address) : Eastwood Road Wilmington, North Carolina New Hanover County Applicant Name: Mr. James F. Smith Blair Properties, Inc. Mailing Address: Post Office Box 468 Wrightsville Beach, N.C. 28480 Submittal Date: August 12, 1991 Water Body Receiving Stormwater Runoff: Motts Creek Classification of Water Body: "SB #" lC H/W DETENTION POND EVALUATION 1. Yes No The design storage is for the runoff from all impervious surfaces resulting from 1-inch of rainfall and is located above the permanent pool. 2. Yes No The permanent pool is designed for 90% TSS removal. Therefore, no vegetative filter is required. 3. Yes No The runoff completely draws down to the permanent pool in 5 days, but not less than 2 days. 4. Yes No The mean depth of the permanent pool is a minimum of 3 feet. 5. Yes No The inlet structure is designed to minimize turbulence and short circuiting. 6 . Yes No An appropriate operation and maintenance plan has been provided for the system. -Continued- WET DETENTION POND EVALUATION CONTINUED 7. Yes No THIS PROJECT MEETS THE STORMWATER CONTROL REQUIREMENTS OF I5A NCAC 2H. 1003 (g) , (i) , (k) , and (1) (For Yes, 1 through 7 must all be circled Yes. ) Brief Explanation: The surface area of three detention ponds have been designed to remove 90% TSS without the aide of a vegetative filter. DIVISION OF ENVIRONMENTAL MANAGEMENT SIGN-OFF Wilmington Regional Office 11/, /9/ 44) Date In ividual Evaluating Form/Plans 4dati Le& !rig - `� �� fs- Date Water/Quality Regional Supervisor cc: Applicant/WiRO/Mills/CF PEMBROKE AT LANDFALL OPERATION AND MAINTENANCE SCHEDULE STORMNATER DETENTION SYSTEM 1. Inspect detention ponds at monthly intervals minimally and after all significant storms. A storm that raises the normal pool 1 foot shall be considered significant. Inspect outlet structure for damage and clogging. 2 . It is recommended that a visual inspection be made monthly of the inlets and outlets of the system to detect blockages or flooding at inlets and manholes, or erosion or damage to outlet devices. Inspections should also follow heavy rainfalls (2" in 24 hours or more) and intense storm events. 3. Annual inspections are recommended, to include removing covers of all structures, cleaning debris or deposits from structures, lamping lines for evidence of sediment and repair as needed. 4. The wetted perimeter of ponds shall be planted with water resilient vegetation appropriate to soil and site characteristics and maintained to ensure growth of such vegetation. 5. Side slopes which exhibit sloughing, channel erosion, or vegetative wash-out shall be repaired immediately. 6. Rip rap may occasionally require repositioning and replacement because of heavy flow displacing the material. 7. A report form is attached for use in both monthly and annual inspections. These reports should be maintained in a central file, available to the Division of Environmental Management in accordance with the Certification. 8. A stamped Engineer's Certification which ensures construction is consistent with the plans and specifications approved by the Division of Environmental Management shall be provided to the Division of Environmental Management within 30 days from project completion. 9. Measure sediment accumulation in bottom of ponds at six month intervals. Ca al! r u u i sediment depth exceeds U. six inches. L� AUG 1 9 199f DEM _' O # ?/0 Accidental Spills or Overwash of Polluted Areas 10. In the event of an accidental spill or overwash of an area containing hazardous material, the event should be immediately reported to A. Preston Howard, Jr. , P.E. , Regional Supervisor, 127 Cardinal Drive Extension, Wilmington, NC 28405 (Telephone 919-361-5000) . 11. Immediate action by the Owner should be taken to contain the spill or overwash, if possible, corrective actions should be taken with the advice of the Regional Supervisor or other designated officials having authority in such matters. 12. The Owner, Blair Properties, Inc. , shall be responsible for implementing this maintenance plan. I, James F. Smith, an agent of Blair Properties, Inc. , accept responsibility for operation and maintenance of the stormwater detention system for Pembroke at Landfall. SIGNED DATE WI C lE 11 V k Li, AUG 1 2 1991 D E M ,,eo j # F4-W 9C)6 RECEIVED Pembroke at Landfall MAR g 5 1993 Stormwater Project No. 910806 Wilmington Regional Officer DEM Engineer's Certification I, S. k'e4L eCO , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, Pe,•‘bvt. ._ Lu i3O f O (Project) for gtq;fr. PYO 4,w, )., c. . (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. Signature ®�`' -s', CA?/l �a_:. Registration Number /Z S 6 y = e SEAL 'ke-1 :: o e Date /! i/90''e( /7 51 . co STORMAT ER At6' k II Y tg io MAR 1 6 1993 DEM 7 r # 4