19910022 Ver 2_Staff Comments_20170911

Burdette, Jennifer a
From:
Homewood, Sue
Sent:
Monday, September 11, 2017 1:14 PM
To:
Burdette, Jennifer a
Subject:
Smithfield Foods
Per the application narrative, a portion of the stormwater runoff will be collected within an underground detention
stormwater system and the system will be drained via a stormwater pump and drainage channel. Please provide
calculations of the storage volume that will be provided by the underground storage system, and design details of the
pump system. Please provide calculations that show that the pumped stormwater will be discharged to the adjacent
wetland at non-erosive velocities. On plan sheet C5.0 the "proposed underground detention" is identified with a note to
refer to the Grading Plan. On plan sheet C6.0, Grading Plan, the same storm pipes are identified in the legend as "existing
storm pipe". Please clarify existing storm pipes versus new storm pipes and ensure that any existing stormwater that is
directed to the "underground detention" is accounted for in the storage calculations.
Please provide specific construction drawings for the riprap level spreader and provide calculations to document that
stormwater that sheet flows through this area will be non-erosive.
Thanks,
Sue Homewood
Division of Water Resources, Winston Salem Regional Office
Department of Environmental Quality
336 776 9693 office
336 813 1863 mobile
Sue. [e-mail]
450 W. Hanes Mill Rd, Suite 300
Winston Salem NC 27105
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