The URL can be used to link to this page

Home My WebLink About20100510 Ver 1_More Info Letter_20100720I fA NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Dee Freeman Governor Director Secretary July 20, 2010 CERTIFIED MAIL: RETURN RECEIPT REQUESTED Chatham County Attn: Mr. David Hughes 295 West Street Pittsboro, NC 27312 DWQ Project # 2010-0510 Chatham County Subject Property: Chatham County Law Enforcement Center Parking Lot Mod and Expansion UT to Robeson Creek [030604, 16-38-(3), WSIV, NSW] REQUEST FOR MORE INFORMATION Dear Mr. Hughes: On June 25, 2010, the Division of Water Quality (DWQ) received your application dated June 16, 2010 to impact 455 square feet (ft) of Zone 1 protected riparian buffers and 496 square feet (ft) of Zone 2 protected riparian buffers for the stormwater outfall at the subject property. The DWQ has determined that your application was incomplete and/or provided inaccurate information as discussed below. The DWQ will require additional information in order to process your application to impact protected wetlands and/or streams on the subject property. Therefore, unless we receive five copies of the additional information requested below, we will place this project on hold as incomplete until we receive this additional information. If we do not receive the requested information, your project will be formally returned as incomplete. Please provide the following information so that we may continue to review your project. Additional Information Requested: 1. Please provide an agent authorization letter for the application signature. 2. Per the requirements of the Jordan Riparian Buffer Rule, all new stormwater conveyances from this site must be discharged through a correctly designed level spreader or other BMP that removes 30% of total nitrogen and total phosphorus. Because the bioretention area is being used in lieu of a level spreader, the DWQ considers this device to be the diffuse flow plan for new stormwater outlets A and B. 3. Please provide a full-size plan sheet showing the entire site with its storm drainage system, including every inlet, outlet and conveyance device. Please show how diffuse flow requirements have been met at each proposed new stormwater outlet location. 401 Oversight/Express Review Permitting Unit 2321 Crabtree Blvd, Suite 250, Raleigh, North Carolina 27604 Phone: 919-733-17861 FAX: 919-733-6893 Internet: http://portal.ncdenr.org/webtwgtws NonrthCarohna Naturally An Equal Opportunity 1 Affirmative Action Employer Chatham County Page 2 of 3 4. Please address the following design issues with the bioretention area. Additional design issues may become apparent after the DWQ has the opportunity to review the supplement form and required items: • The forebays of the proposed bioretention areas should be equipped with liners to prevent stormwater from seeping through the berm and passing directly to the underdrain system without appropriate treatment. Please provide a design for the northeastern forebay. • The planting plan must show the actual location of the plants within the bioretention cell. • The use of two-year, slow release fertilizer is in excess of the BMP manual's fertilizer limitations, which allow only a one-time fertilizer application to establish vegetation. • A scaled cross-section must be provided showing the forebay, treatment area, underdrains, media, outlet structure, sand layer, mulch, filter fabric, etc. • The tree and shrub planting details should be modified to show one-half to one-third of the rootball above grade. • The discharge pipe should be extended to the stream bank to avoid erosion issues within the riparian buffer. • A soil test to document the estimated elevation of the seasonal high water table must be provided. • The engineered soil media must have a minimum depth of three feet. The appropriate P- index for the soil media must be specified. • A signed and notarized Operation and Maintenance Agreement must be provided. 5. Please explain how the remaining undeveloped area on the north side of the property fronting US-64 will be utilized. 6. One (1) data Cis of full Silo pia?15 in TIFF G uav 4 fumiat (blac,;. aid white, ?iot gia)??alc of cola). If the plans are too large to store in TIFF format, they can be stored in PDF format. Please respond in writing within 30 calendar days of the date of this letter by sending a copy of this information to me. If you will not be able to provide the requested information within that timeframe, please provide written confirmation that you intend to provide the requested information, and include a specific timetable delineating when the requested materials will be provided. If we do not hear from you in 30 calendar days, we will assume that you no longer want to pursue this project and we will consider the project as returned. This letter only addresses the application review and does not authorize any impacts to wetlands, waters or protected buffers. Please be aware that any impacts requested within your application are not authorized (at this time) by the DWQ. Please call Ms. Amy Chapman or Mr. Ian McMillan at 919-733-1786 if you have Chatham County Page 3 of 3 any questions regarding or would like to set up a meeting to discuss this matter. Sincerely, la McMillan, Acting Supervisor 401 Oversight/Express Review Permitting Unit ASC cc: Lauren Witherspoon, DWQ Raleigh Regional Office Rivers & Associates, Inc, Attn: Mr. David Smith, 6131 Falls of Neuse Rd, Suite 300, Raleigh, NC 27609 File Copy Filename: 100510ChathatnCountyLawEnforcementCenterParkingLot(Chatham)JBR_Or _Hold ■ Complete items 1, 2, and 3. Also complete item 4 if Restricted Delivery is desired. ■ Print your name and address on the reverse so that we can return the card to you. ■ Attach this card to the back of the mailpiece, or on the front if space permits. 1. Article Addressed to: CHATHAM COUNTY 7/21/10 MR DAViDl:1UGHES 295 WEST STREET PITTSBORO NC 27312 DWQ 10-0510 CHATHAM COUNTY 2. Article Number (Transfer from service tal PS Form 3811. February 2004 A. Sji yre X 11J ❑Agent ❑ Addressee B eceii d y (P T Name) C Date of Delivery allu D. Is delivery address different from item 1? ❑ Yes If YES, enter delivery address below: ❑ No 3. Service Type Certified Mail ❑ Express Mail ❑ Registered V'Retum Receipt for Merchandise ❑ Insured Mail ❑ C.O.D. 4. rtestnaea ueuveryr pzxrra reed 7009 2820 0004 4137 1929 Domestic Return Receipt ❑ Yes 102595-02-M-1 540 UNITED STATES POSTAL 8ERViCt r It -GIS S maw, -' :USPS .. P¢r U.^ • Sender: Please print your name, address, and ZIP+4 in this box • NC DENR DIVISION OF WA"FER QlJALITY 401 OVERSIGHT/EXPRESS UNIT 2321 CRA13TIZEE BOULEVARD, SUI FE 250 RALEIGH. NC 27604 . �••., f„I,�1, ,Ili„i�..„!„I.,i,I..f,�,lf�...11;,l:;,?l,,.,,►i,!