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HomeMy WebLinkAbout20070076 Ver 1_Stormwater Info_20070719~ Kimley-Horn ~ ~~~~~~ ,~ o~ _ ,~o~ ~, ~ and Associates, Inc. r1 -7 Suite 300 ~ 'v , ~ ~ ~ ( 4651 Charlotte Park Dive Charlotte, NC 28217 C~~NR - ~NA11rK QUAU1'1' ~TLMiO$ ~~ rQ~},~S!AT~R BRANCH TEL 704-333-5131 FAX 704-333-0845 Transmittal Date: July 18, 2007 Job Number: 018253007.2700 Project Name: Crescent Project at Concord Mills -DWQ #07-0076 To: NCDWQ Wetlands Program Development Unit Attention: Annette Lucas 2321 Crabtree Blvd. Raleigh, NC 27604 (919)715-3425 We are sending these by ^ U.S. Mail ® FedEx Priority Box ^ Hand Deliver ^ Other: We are sending you ® Attached ^ Under separate cover via the following items: ^ Shop Drawings ®Prints/Plans ^ Samples ^ Specifications ^ Change Orders ^ Other: Copies Date No. Description 1 1 Copy of DWQ Permit #07-0076 1 2 401 Extended Detention Worksheet for Wetlands I and 2 1 3 Crescent Apartments Drainage Calculations I 4 Paving and Grading Plan Sheets C-9 and C-22 I 5 Wetland Landscape Plan Sheets L8-01 - L8-05 1 6 Operation and Maintenance Agreement These are transmitted as checked below: ® For your use ^ Approved as submitted ^ Resubmit ^ Copies for approval ^ As requested ^ Approved as noted ^ Submit ^ Copies for distribution ^ For review and comment ^ Returned for corrections ^ Return ^ Corrected prints Remarks: Annette, enclosed is the required storm water management information for the Crescent Multi-Family site (portion of Rocky River Landing Phase 1) for your review. Please give me a call with any questions or if you require additional information at 704/9~~54~~-7~~ 490. Thank you. Copy to: Brian Natwick via: 980.321.6240 Signed C/"~` Chris Ralph, P. . P:\018253 Crescent\007 Concord Multi-Family\Correspondence\Trans\DWQ_Sub.doc O~O~ ~Ax~R~G -•! Cfl ~ Michael F. Easley, Governor William G. Ross Jr., Secretary North Cazoina Department of Environment and Natural Resources Alan W. Klimek, P.E. Director Division of Water Quality March 27, 2007 DWQ# 07-0076 Cabarrus County Mr. David Niekamp Crescent Resources, LLC 400 S. Tryon St., Suite 1300 Charlotte, NC 28285 Subject: Rocky River Landing Development, Phase I APPROVAL of 401 Water Quality Certification with Additional Conditions Dear Mr. Niekamp: You have our approval, in accordance with the attached conditions and those listed below, to fill 0.49 acre of wetland and 150 linear feet (If) of unnamed stream to the Rocky River in order to construct the proposed development in Cabarrus in Union County, as described in your application received by the Division of Water Quality (DWQ) on January 16, 2007. After reviewing your application, we have determined that this project is covered by Water Quality General Certification Number 3402, which can be viewed on our web site at http://h2o.enr.state.nc.us/ncwetlands. The General Certification allows you to use Nationwide Permit Number 39 once it is issued to you by the U.S. Army Corps of Engineers. Please note that you should get any other federal, state or local permits before proceeding with your project, including those required by (but not limited to) Sediment and Erosion Control, Non-Discharge, and Water Supply Watershed regulations. This Certification replaces the one issued to you on February 22, 2007. Please note the revision of condition #7 of the previous approval letter. The above noted Certification will expire when the associated 404 permit expires unless otherwise specified in the General Certification. This approval is only valid for the purpose and design that you described in your application. If you change your project, you must notify us in writing, and you may be required to send us a new application for a new certification. If the property is sold, the new owner must be given a copy of the Certification and approval letter; and is thereby responsible for complying with all conditions. In addition to the requirements of the certification, you must also comply with the following conditions: 1. The Mooresville Regional Office shall be notified in writing once construction at the approved impact areas has commenced. 2. Stream impacts for future phases for the project shall be considered "cumulative" for the project. N~°` Caro na turul~ly North Carolina Division of Water Quality 610 East Center Ave., Suite 301 Mooresville, NC 28115 Phone (704) 663-1699 Customer Service Internet: navaterqulaity.org FAX (704) 663-6040 1-877-623-6748 An Equal OpportunitylAffirmative Action Employer- 50°k Recycled110% Post Consumer Paper 3. All wetlands, streams, surface waters, and riparian buffers located on the project site where impacts are not allowed shall be clearly marked (example- orange fabric fencing) prior to any land disturbing activities. 4. We understand that you have chosen to contribute to the Ecosystem Enhancement Program (EEP) in order to compensate for the impacts the stream. In accordance with 15A NCAC 2R .0402 and 15A NCAC 2B .0242(7), this contribution will satisfy our compensatory mitigation requirements under 15A NCAC 2H .0506(h) and 15A NCAC 2B .0233(10). Until the EEP receives and clears your check (made payable to: DENR -Ecosystem Enhancement Program), the stream impact shall not occur. The in-lieu-of fee coordinator should be contacted at (919) 715-2227 if you have any questions concerning the EEP. You have one month from the date of this Certification to make this payment. For accounting purposes, this Certification authorizes the fill of 0.49 acre of wetlands and 150 linear feet of perennial streams in the Yadkin River Basin, Cataloging Unit 03040105, and 150 linear feet of stream mitigation is required. Please be aware that the EEP rules require rounding of stream impacts to the nearest foot and wetland impacts to the nearest quarter acre (15A NCAC 2R .0503(b)). 5. Use of native vegetation and other soft stream bank stabilization techniques must be used where practicable instead of riprap or other bank hardening methods. If riprap is necessary, it shall not be placed in the stream bed, unless approved by the DWQ. 6. Storm water discharge structures at this site shall be constructed in a manner such that the potential receiving streams (of the discharge) will not be impacted due to sediment accumulations, scouring or erosion of the stream banks. 7. (Revision) A final written storm water management p{an shall be approved in writing by this Office prior to the construction of any permanent facilities at the subject site (Phase I). The storm water facilities must be designed to treat the runoff from the entire project, unless otherwise explicitly approved by the Division of Water Quality. Before any permanent building is occupied in Storm water Treatment Zone A, the storm water facilities, as approved by this Office, shall be constructed and operational and the storm water management plan as approved by this Office, shall be implemented. Before any permanent building is occupied in Storm water Treatment Zone B, the storm water facilities, as approved by this Office, shall be constructed and operational and the storm water management plan as approved by this Office, shall be implemented. Before any permanent building is occupied in Storm water Treatment Zone C, the storm water facilities, as approved by this Office, shall be constructed and operational and the storm water management plan as approved by this Office, shall be implemented 8. No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas beyond the footprint of the impacts depicted in the Preconstruction Notification application. All construction activities associated with this project shall meet, and/or exceed, those requirements specified in the most recent version of the North Carolina Sediment and Erosion Control Manual and shall be conducted so that no violations of state water quality standards, statutes, or rules occur. 9. Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum extent practicable. If placement of sediment and erosion control devices in wetlands and waters is unavoidable, they shall be removed and the natural grade restored within two months of the date the Division of Land Resources has released the project. 10. Upon completion of the project, the applicant shall complete and return the enclosed "Certificate of Completion" form to the 401NVetlands Unit of the NC Division of Water Quality. Please send photographs of the upstream and downstream sides of each culvert site to document correct installation, along with the Certificate of Completion form. 11. Continuing Compliance. The applicant (Crescent Resources, LLC) shall conduct all activities in a manner so as not to contravene any state water quality standard (including any requirements for compliance with section 303(d) of the Clean Water Act) and any other appropriate requirements of state and federal law. If DWQ determines that such standards or laws are not being met (including the failure to sustain a designated or achieved use) or that state or federal law is being violated, or that further conditions are necessary to assure compliance, DWQ may reevaluate and modify this certification to include conditions appropriate to assure compliance with such standards and requirements in accordance with 15 A NCAC 2H.0507(d). Before codifying the Certification, DWQ shall notify the applicant and the US Army Corps of Engineers, provide public notice in accordance with 15A NCAC 2H.0503, and provide opportunity for public hearing in accordance with 15A NCAC 2H.0504. Any new or revised conditions shall be provided to the applicant in writing, shall be provided to the United States Army Corps of Engineers for reference in any permit issued pursuant to Section 404 of the Clean Water Act, and shall also become conditions of the 404 Permit for the project. If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must act within 60 days of the date that you receive this letter. To ask for a hearing, send a written petition that conforms to Chapter 1508 of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. This Certification and its conditions are final and binding unless you ask for a hearing. This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act. If you have any questions, please telephone Mr. Alan Johnson in the Mooresville Regional Office at 704-663-1699 or Ms. Cyndi Karoly in the Central Office in Raleigh 919-733-9721. Sirtrely, ,a ~~'~ ~y, , ~,~ ,a'/ ~ '.w~,,., f~ ,,.r.. ..,+... i4, t. _ . _, SI/_/11 1 for Alan W. Klimek, P.E. cc: Army Corps of Engineers, Asheville Ian McMillan, Wetlands Unit Cabarrus County Development Svc. Becky Fox, EPA Central Files File Copy Len Rindner DWQ Project No. ~ 7 ` ~d ~ (e DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET") WETLAND WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : Crescent Apartments at Concord Mills - Phase I Contact PerSOn: Chris Ralph Phone Number: (~04) 954-7490 For projects with multiple basins, specify which basin this worksheet applies to: ExTENDED DETENTION WETLAND # 2 Permanent Pool Elevation Temporary Pool Elevation 594.0 ft 595.55 ft. (elevation of the orifice invert out) (elevation of the outlet structure invert in) Permanent Pool Surface Area Drainage Area Impervious Area Forebay Surface Area Marsh 0"-9" Surface Area Marsh 9"-18" Surface Area Micro Pool Surface Area Temporary Pool Volume SA/DA used Diameter of Orifice II. REQUIRED ITEMS CHECKLIST a51o sq. ft. 5.16 ac. 2. a1 ac. 1353 sq. ft. z 614 sq. ft. 3o~z sq. ft. 1471 sq. ft. (water surface area at permanent pool elevation) (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (at permanent pool elevation approximately 15%)* (at permanent pool elevation approximately 35%)* (at permanent pool elevation approximately 35%)* (at permanent pool elevation approximately 15%)' 17437 cu. ft. (volume detained on top of the permanent pool) z . 06 (surface area to drainage area ratio)* 2 . o in. (draw down orifice diameter) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project Applicants Initials (Q The temporary pool controls runofffrom the 1 inch rain. csEE NOTE 1> CIQ The basin side slopes are no steeper than 3:1. CQ A planting plan for the marsh areas with plant species and densities is provided. c Vegetation above the permanent pool elevation is specified. ~ An emergency drain is provided to drain the basin. ~ The temporary pool draws down in 2 to 5 days. ~~ Sediment storage is provided in the permanent pool. <R A sediment disposal area is provided. ~ Access is provided for maintenance. ~Q A site specific, signed and notarized operation and maintenance agreement is provided. CR The drainage area (including any offsite area) is delineated on a site plan. C R Access is provided for maintenance. ~ Plan details for the wetland are provided. R Plan details for the inlet and outlet are provided. C R A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see http:l/h2o.eh nr.state.nc. uslncwetlandsloandm.doc). * Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh. NOTE 1: PER THE CITY OF CONCORD STORMWATER ORDINANCE, THE TEMPORARY POOL WAS SIZED TO DETAIN THE DIFFERENCE IN VOLUME OF RUNOFF BETWEEP7 THE PRE AND POST 1 YR - 24 HR STORM EVENTS SINCE THIS VOLUME IS LARGER THAN THE 1" STORM EVE[~IT. DWQ Project No. Q ~ - UU 7 6 DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name: .crescent Apartments at Concord Mills - Phase Contact PerSOn: Chris Ralph Phone Number: (704) 954-7490 For projects with multiple basins, specify which basin this worksheet applies to: ExTENDED DETENTION WETLAND # 1 Permanent Pool Elevation Temporary Pool Elevation Permanent Pool Surface Area Drainage Area Impervious Area Forebay Surface Area Marsh 0"-9" Surface Area Marsh 9"-18" Surface Area Micro Pool Surface Area Temporary Pool Volume SA/DA used Diameter of Orifice II. REQUIRED ITEMS CHECKLIST 594.0 ft 595.15 ft. 32652 sq. ft. 11.43 aC. 6.59 aC, 4634 sq. ft. 1252s sq. ft. 10886 sq. ft. 4607 sq. ft. (elevation of the orifice invert out) (elevation of the outlet structure invert in) (water surface area at permanent pool elevation) (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (at permanent pool elevation approximately 15%)* (at permanent pool elevation approximately 35%)* (at permanent pool elevation approximately 35%)* (at permanent pool elevation approximately 15%)* 41238 cu. ft. (volume detained on top of the permanent pool) 2.0 6 (surface area to drainage area ratio)* 7 . o in. (draw down orifice diameter) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project Applicants Initials CR The temporary pool controls runoff from the 1 inch rain. (sEE NOTE 1 > R The basin side slopes are no steeper than 3:1. ~~ A planting plan for the marsh areas with plant species and densities is provided. ~, Vegetation above the permanent pool elevation is specified. ~~ An emergency drain is provided to drain the basin. CQ The temporary pool draws down in 2 to 5 days. ~e Sediment storage is provided in the permanent pool. ~R A sediment disposal area is provided. « Access is provided for maintenance. R A site specific, signed and notarized operation and maintenance agreement is provided. Ci' The drainage area (including any offsite area) is delineated on a site plan. CL Access is provided for maintenance. C ~ Plan details for the wetland are provided. CQ Plan details for the inlet and outlet are provided. C A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see http://h2o.eh nr.state.nc. us/ncwetlands/oandm.doc). * Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS -See pp. 19 and 20 of the NC DENR stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh. NOTE 1: PER THE CITY OF CONCORD STORMWATER ORDINANCE, THE TEMPORARY POOL WAS SIZED TO DETAIN THE DIFFERENCE IN VOLUME OF RUNOFF BETWEEr~7 THE PRE AND POST 1 YR - 24 HR STORM EVENTS SINCE THIS VOLUME IS LARGER THAN THE 1" STORM EVENT. r 'D `1 - ooh L EXTENDED WETLAND DETENTION OPERATION AND MAINTENANCE AGREEMENT (1/2007) Name of Project: Crescent Apartments at Concord Mills -Phase 1 Address: Proposed Thunder Road Extension, Concord, NC Maintenance activities shall be performed as follows: MAINTENANCE ACTIVITY FREQUENCY Debris and litter control checks for inlet, outlet and After every storm producing runoff. orifice obstruction Provisions for routine vegetation management and As needed during growing season mowin Maintenance and Inspection of: Every six months • Sediment buildup and the need for removal • Erosion along the bank and the need for reseeding or stabilization and, if reseeding is necessary, a reseeding schedule • Erosion at the inlet and outlet and methods of stabilization • Seepage through the dam/control structure • Operation of any valves or mechanical components • Debris buildup in pocket wetlands and need for removal Maintenance and Inspection of: Once per year • Obstructions of the inlet and outlet devices by trash and debris • Excessive erosion or sedimentation in or around the basin • Cracking or settling of the dam/control structure • Deterioration of inlet or outlet pipes • Condition of the emergency spillway • Stability of side-slopes • Up and downstream channel conditions • Woody vegetation in or on the dam • Wetlands after a rain event to ensure the basin is operating as designed • Clo in of the outlet or too ra id a release Page 1 of 2 r` EXTENDED LOCATION ON SITE (DESCRIBE) HOW WILL IT BE ACCESSED? WETLAND NO. Larger wetland located in the northern portion Wetland can be accessed using a roll 1 of the Phase 1 site. curb and proceeding along an existing ridge on the northern side of the wetland. 2 Smaller wetland located in the eastern portion of the Phase 1 site. Wetland can be accessed using a roll curb placed at the head of a parking s ace between Buildin s 11 and 12. I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ and/or the City of Concord of any problems with the system or prior to any changes to the system or responsible party. Print name: Brian J. Natwick ~i6 Crescent Resources LLC Title: Development Manager Address: 400 South Tryon Street, Suite 1300 Charlotte, NC 28202 Phone: 980-321-6234 n ~ /I _ Signature: Date: S S ' I, l~/' fir' ~ ° , a Notary Public for the State o~~.~c.s-e~-,~.~, County of , do hereby certify that personally appeared before this ~J day of a o ,and acknowledge the due execution of the forgoing wet [wetland] detention basin m ' tenance requirements. Witness my hand and official seal, No1oy lAubNc M~nbap Co~iq- llaw- a Noon Ccrolno SEAL My commission expires • ~O aO~d Page 2 of 2