20081121 Ver 1_Staff Comments_20090326

08-1121 Diamond's Keep SD
Subject: 08-1121 Diamond's Keep SD
From: Annette Lucas <[e-mail]>
Date: Thu, 26 Mar 2009 13:40:32 -0400
To: Sue Homewood <[e-mail]>
CC: Annette Lucas <[e-mail]>
Sue Good to talk to you. I looked over the design of the wet ponds and they
actually looked pretty good - they had a nice design summary on the last plan sheet.
I am still going to ask them to do the Supplement Forms though for consistency and
also because they did leave out a few required items.
Let me know if you think this wording needs to be modified. Thanks for sending out
the letter.
A
Annette Lucas, PE
NC Division of Water Quality - 401 Oversight/Express Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
Phone: [phone]
Fax: [phone]
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
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08-1121 Diamond's Keep SD
AML Comments
March 26, 2009
1. For Basins 1, 4, 6, 7 and 8, please provide a detailed inventory of imperviousness
surfaces. The inventory should include ALL proposed building footprints, roads,
driveways, sidewalks, gravel-surfaced areas, amenity areas, etc. A Stormwater
Management Plan (SMP) must be provided for any drainage areas that exceed 24
percent imperviousness. Per NCAC 2B 15A: 02H.1000, a "drainage area" is
defined as "the entire area contributing surface runoff to a single point."
2. For Basins 3, 9, 10, 11 and 12, please explain the current and future uses of the
areas that are not currently platted in lots. The impervious surface calculations for
these basins are currently based on these areas remaining as open space
permanently.
For Wet Detention Ponds 2 and 13, please provide a Wet Detention Basin
Supplement Form for each proposed best management practice that will be used
on the site (including both worksheets, Design Summary and Required Items
Checklist), as well as all of the required items. The Wet Detention Basin
Supplement Forms are available on the DWQ web site at:
l.ittp:i,'h2o.en:r.state.nc.us/su/Ibmp forms.htm.