20081121 Ver 1_Staff Comments_20090331

Re: 08-1121 Diamond's Keep SD
Subject: Re: 08-1121 Diamond's Keep SD
From: Annette Lucas <[e-mail]>
Date: Tue, 31 Mar 2009 09:05:26 -0400
To: Sue Homewood <[e-mail]>
CC: Cyndi Karoly <[e-mail]>, Annette Lucas <[e-mail]>
Sue,
I spoke with Cyndi and we liked your suggestions. Here is a revised version of the
comments that reflects your ideas.
Thanks,
Annette
Sue Homewood wrote:
Good to talk to you also. May I make a clarification suggestion on items 41 and
42? Item 41, once you have the inventory will you be requesting documentation of
deed restrictions to ensure they don't add more impervious in these basins? If
so, I think it might help to add that request now rather than a second letter.
Maybe you just write this into a permit condition tho, I'm not sure I've dealt
with one of these situations before.
Item 42, if they say it will be permanent open space will you want to see
documentation of that? if so, I suggest asking for it now.
These are only suggestions, I will send out whatever wording you request me to.
Sue Homewood
NC DENR Winston-Salem Regional Office
Division of Water Quality 585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
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On 3/26/2009 1:40 PM, Annette Lucas wrote:
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]
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3/31/2009 9:05 AM
Re: 08-1121 Diamond's Keep SD
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08-1121 Diamond's Keep SD revised.doc
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08-1121 Diamond's Keep SD - REVISED
AML Comments
March 30, 2009
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 any drainage areas that are between 22 and 24 percent impervious, please
provide draft deed restriction language that will limit lot imperviousness such that
low density conditions are permanently maintained. In that case, you will be
required to denote the impervious surface limit on each plat as a condition of your
401 Certification.
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. If these undesignated areas are to be permanently protected as open
space (with no additional impervious surfaces to be added in the future), then
please provide documentation of that intent.
4. 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:
http://l12o.enr.state.nc.us/su,'bnnp forms litm.