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Home My WebLink AboutSW3171101 (2)Energy. Mineral & Land Resources ENVIRONMENTAL QUALITY November 29, 2017 Mr. Ben Munn, PE Civil Design Concepts, PA 168 Patton Ave. Asheville, NC 28801 Subject: Request for Additional Information Stormwater Permit No. SW3171101 State Employees' Credit Union — Granite Quarry Rowan County Dear Mr. Munn: ROY COOPER Governor MICHAEL S. RLGAN sectelnr1 TRACY DAVIS Dlre0w The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater Management Permit Application for the subject project on November 6, 2017. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: 1. Provide a soils report that includes the SHWT elevation within the footprint of each SCM [MDC 1]. 2. Provide a completed supplement form for the SCMs, using the Supplement -EZ form at: hgps:Hdeq.nc. gov/about/divisions/energy-mineral-land-resources/energy-mineral-land- permit-guidance/stormwater-bmp-manual 3. Provide a completed O&M Agreement for the SCMs, using the O&M -EZ form at: hgps:Hdeq.nc. gov/about/divisions/energy-mineral-land-resources/energy-mineral-land- permit-guidance/stormwater-bmp-manual 4. On sht. C501, the impervious areas for pre and post development in the project data table is not consistent with the narrative and calcs. 5. Show the existing and proposed contours on the pre and post DA maps; and delineate the DA for each SCM. 6. Provide the DA maps at a legible scale [02H.1042]. 7. Provide supporting calcs. for the 1" WQV and the underdrain sizing for each SCM [Gen MDC 1]. Nothing Compares--.,- SState of North Carolina I Environmental Quality I Energy, Mineral and Land Resources 512 N. Salisbury Street 1 1612 Mail Service Center I Raleigh, North Carolina 27699-1612 919 707 9200 8. On sht. C953: a. Add a plan view of each SCM at a scale of 1 "=30' or larger [02H .1042]. It must show the underdrains and cleanouts [MDC 5]. b. Spec. that #57 stone shall be washed. c. Spec. that the sand in the media be medium to coarse sand per MDC 6. d. Spec. that the sod not be grown in clay soils per MDC 10. e. Spec. that no mechanical compaction be used per MDC 8. 9. An IWS zone must be provided on the underdrains unless onsite soils tests demonstrate in-situ soils have an infiltration rate of 2 in/hr or greater [MDC 4 &5]. 10. The media depth must be a minimum of 30" with an IWS zone [MDC 5]. 11. The P -index no longer has a lower threshold of 10 [MDC 7]. 12. Demonstrate non-erosive flow for the 10 -yr storm at each discharge point into each SCM. Energy dissipaters are recommended. [Gen MDC 4] 13. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1 hardcopy of other documents. Pdfs must be uploaded using the form at: https:Hedocs.deq.nc.gov/Fonns/SW ProjectSubmittal Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to December 29, 2017, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please submit your request for a time extension to the Division at the contact below. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number SW3171101 on all correspondence. If you have any questions concerning this matter please feel free to contact me at Robert.Patterson&ncdenr.gov or (919) 807-6369. Sincerely, Robert D. Patterson, PE Environmental Engineer Stormwater Program Nothing Compares --.,- State of North Carolina Environmental Quality Energy, Mineral and Land Resources 512N. Salisbury Street 1612 Mail Service Center Raleigh, North Carolina 27699-1612 919 707 9200 ec: Mooresville Regional Office Jamie Applequist - SECU Nothing Compares --.,- State of North Carolina Environmental Quality Energy, Mineral and Land Resources 512N. Salisbury Street 1612 Mail Service Center Raleigh, North Carolina 27699-1612 919 707 9200