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Home My WebLink About20090566 Ver 2_More Info Letter_20101014A113" WNW North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Dee Freeman Governor Director Secretary October 14, 2010 DWQ Project # 09-0566 Johnston County Mr. Joe Poole Caterpillar 954 NC 42 East Clayton, NC 27520 Subject Property: Caterpillar Access Road Ut to Neuse River [030402, 27-(39.7), WSIV, NSW] REQUEST FOR MORE INFORMATION: STORMWATER MANAGEMENT PLAN Dear Mr. Poole: On May 21, 2009, the Division of Water Quality (DWQ) issued a 401 Water Quality Certification to impact 192 linear feet of perennial stream, 15,004 square feet of Zone 1 Neuse River basin protected riparian buffers and 9,770 square feet of Zone 2 Neuse River basin protected riparian buffers. In order to meet Condition Nos. 6 and 7 of the 401 Certification for this project, a stormwater management plan for Phase 2A, dated September 10, 2010 was received by the DWQ on September 13, 2010. Based on discussions between Caterpillar staff, the consultant and DWQ staff during an on-site meeting held on September 29, 2010, the stormwater management plan was modified. The revised stormwater management plan, dated October 12, 2010, was received by the DWQ on October 12, 2010. The DWQ has determined that your stormwater management plan was incomplete as discussed below. Additional Information Requested: 1. For all site plans, please clearly show the permanent ground cover (e.g., gravel, asphalt, grass, permanently disturbed, etc.) throughout the entirety of Phase 2A. 2. For the de-muck and deadman with J-hook areas, please expand the area shown on the plan details to include the ultimate discharge points of all stormwater outfalls (e.g., a previously approved wet detention pond, a permanent sediment basin, an existing conveyance, etc.). If any stormwater is to be discharged to an existing conveyance, then please provide calculations to show that the receiving channel will not be eroded by the additional flows during the peak flow of the 10-year storm. 401 Oversight/Express Review Permitting Unit 1650 Mail Service Center, Raleigh, North Carolina 27699-1650 Location: 2321 Crabtree Blvd., Raleigh, North Carolina 27604 Phone: 919-733-17861 FAX: 919-733-6893 Internet: http://h2o.enr.state.nc.us/ncwetlands/ One Naturally An Equal Opportunity 1 Affirmative Action Employer Caterpillar Page 2 of 3 October 14, 2010 3. Please remove the endurance area from the plans if it is not going to be constructed at present. If it is to remain on the plans, then an appropriate sediment and erosion control design for this area must be provided. 4. Please provide measures to protect the area between the upslope vegetated areas and the main treatment area of the sediment basin from erosion. 5. Please provide a berm or other method to ensure that the scour holes discharge to the blind swale rather than short-circuiting the LS-VFS and running directly down the hill. 6. Please provide underdrains for the blind swales immediately upslope of the level spreaders. This will insure the survival of the grass within the swales (and thus provide additional treatment and protection from erosion). Another option for managing the blind swales is to enlarge them and plant them with wetland vegetation in anticipation of frequent inundation. 7. Please provide watering specifications needed to establish the vegetated filter strips. 8. Per our phone conversation, please let us know how you would like to handle the deficiencies in the Phase 1 permanent sediment basin that we observed during our site visit. This can be handled by working with the DWQ 401 Unit during the current stormwater plan review or working through the DWQ Raleigh Regional Office in a separate compliance process. If you choose to include the Phase I basin in the currently proposed stormwater plan, then please provide a re-design for this basin that includes all of the protective measures proposed for permanent sediment basins 2, 4 and 8. 9. Regarding the Operation and Maintenance (0 & M) Agreement: a. The DWQ recommends that the 0 & M Agreement be organized so that the entire sediment control system for Phase 2A is covered under a single agreement. The current submittal includes a separate agreement for each sediment basin and each LS- VFS, which seems more cumbersome than necessary. b. The DWQ recommends that the monitoring requirements and the required measures for managing the permanently disturbed areas be placed at the beginning of the agreement for greater visibility. Please use the term "permanently disturbed areas" or equivalent rather than "endurance field areas" to encompass all relevant areas. c. Please clarify the frequency with which measures 1-3 on the third page of the 0 & M agreement will be implemented. As discussed during our on-site meeting on September 29, 2010, the DWQ is requiring a defined time period for managing the ground surface at the permanently disturbed areas. d. The DWQ recommends that 0 & M requirements for each component of the system be listed in order of the flowpath through the system. Caterpillar Page 3 of 3 October 14, 2010 e. Please ensure that ALL components of the system are included in the 0 & M Agreement, including the vegetated areas upslope of the permanent sediment basins, the scour holes, check dams, etc. f. Please provide specific turbidity monitoring requirements per guidance from the DWQ Raleigh Regional Office. g. Please remove irrelevant verbiage from the standard 0 & M forms that were used as a template (e.g., the sentence stating that stable groundcover will be provided in the drainage area). The DWQ will require the above additional information to finalize review of the stormwater management plan for the subject property. Per our agreement at the September 29, 2010 meeting, please provide this information within seven calendar days. If you have any questions, please telephone Ian McMillan at (919) 715-6823 or Annette Lucas at (919) 715-3425. Sincerely, Ian J. McMillan, Acting Supervisor 401 Wetlands Permitting Unit IJM/aml cc: USACE Raleigh Regulatory Field Office Lauren Witherspoon, DWQ Raleigh Regional Office DLR Raleigh Regional Office File Copy Matt Matthews, DWQ Section Chief Jeff Mann, MACTEC Engineering and Consulting, Inc., 3301 Atlantic Avenue, Raleigh, NC 27604 Grant Livengood, McKim&Creed, 1730 Varsity Drive, Raleigh, NC 27606 Robert B. Hunt, 1441 NC Highway 42 East, Clayton, NC 27527 Filename: 090566V er2CaterpillarAccessRoad(Johnston)_SW_Hold.doc ■ 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: MR JOE POOLE 10/18%10 CATERPILLAR 954 NC 42 E CLAYTON NC 27520 DWQ 09-0566 V2 JOHNSTON COUNTY A. Sign re t 0 B. iv y ( rin ed Name) C. Date of l �r��' tB-C -co D. Is de ery address different from item 1? ❑ Yes If Y S, enter delivery address below:No 3. Service Type Certified Mail S Express Mail❑ Registered Retum Receipt for Merchandise ❑ Insured Mail C.O.D. 4. Restricted Delivery? (Extra Fee) ❑ Yes 2. Article Number 7009 2 8 2 0004 413 7 1417 (Transfer from service IabeQ ---- P5 Form 3811, February 2004 Domestic Return Receipt 70259502-M-1540 iED STATES POSTAL SERVICE R '.•, ~' n y. • Sender: Please print your name, address, and ZIP+4 in this box • NC DENR - DWQ 401 OVERSIGHT/EXPRESS UNIT 2321 CRABTREE BLVD STE 250 RALEIGH NC 27604 "" fttlt�f!!l1311!!t7FF?!�!l1sFi!lttiflf'(!t!!it!!ltlttl313??t!F