20150296 Ver 1_More Info Received_20150603

Strickland, Bev
From: Dev ne,8ovd
Sent: Wednesday, June U3'ZUl5Z:53 PM
To: Strickland, Bev
Subject: please file this in Vickery l5'UZ06
Attachments: Vickery Existing Channel pictures.pdf,Vickery 3Uft buffer onnon-regulated
channeipdf,Vickery Limits of Enhances Svva|es.pdf
From: Brent Cowan [maiKo:bcowan@isaacsgqzcon]
Sent: Wednesday, ]une0],20152:26 PM
To: Oevane,Boyd
Subject: FW: General Question for Residential Streets in Stallings
ME
I just heard your message and returned your call and left you a message on your voice mail. The email belol
and attached pdfs are all I have submitted with respect to the enhanced swales. I was waiting on your
approval on the concept and then will submit revised construction drawings for final approval. Please cal I
From: Brent Cowan
Sent: Friday, May 1S,ZU1S1Z:Z1PM
Tm:'Devane,Boyd'
Cc: Johnson, Alan
Subject: RE: General Question for Residential Streets in Stallings
The existing channels are not man made or dug out, but rather natural features. They are narrow and shallow
and the first attached pdf with photos shows the general shape and condition. The regulated channel will be
protected by a 30' buffer.
Instead of adding 5 add'I channels as your email below suggested, I'd like to offer a counter proposal that I
think would be comparable, if not better for water quality. We would like to propose the addition of a 30'
buffer along the non-regulated existing channel as shown on the second attached pdf in red. Additionally,

we'd like to make 100 Lf. of each swale as shown in the yellow highlighted areas to be "enhanced
swales". The enhanced swale is a BMP in the Charlotte-Mecklenburg BMP Design Standards Manual and it
essentially offers add'l groundwater infiltration and water quality treatment be introducing a 24" wide by 30"
deep mix of permeable soil in bottom of the swale as shown in the image clip below. I would not propose to
I believe by adding the additional 1,250 Lf. of 30' buffer along the each side of the existing non-regulated
stream, and by adding the enhanced swale that will promote infiltration and stormwater treatment, that the
design can be said to meet the nnininnunn requirements of |ovv density design. Please review and let me
know your thoughts.
2'KIN11MW
BOTTOM WIDTH
-��---- FlTER FABW
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�-- 4^UNDERORA|NPERFORATED PIPE
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NOT TO SCALE
From: Devane,Boyd
Sent: Friday, K�ay1S,ZU1S1U:ZZAM
To: Brent Cowan
Cc: Johnson, Alan
Subject: RE: General Question for Residential Streets in Stallings

I'm trying to get an idea of what the "swales" might look like. I'm particularly interested in the two y-shaped drainage
features that are east of Vickery drive and seem to meet east of the stream crossing. Without seeing them, I don't
know if they are just dug ditches (2 or 3 feet deep) or are they flat areas with buffers that will provide some type of
pollutant removal as storm flows pass through. If they do not resemble swales as discussed in the stormwater manual,
we will need to have some more areas where the stormwater runoff can flow through vegetated areas or created swales
before they reach these two drainage ditches or swales, whatever they are.
Alan Johnson and I talked about what we would need to make your project provide "equal or better" treatment than the
curb-cut provisions of the rules. (See below.) We feel that we can allow curb and gutters piped to swales or vegetated
areas like the Weddington example you showed me. Alan prepared a drawing that shows where he and I thought might
be good areas to create some additional swales. There may be better spots but this gives an idea of what we had in
mind. Please look at that and get back with us on what else you might can propose. Allowing piped discharges to swales
or vegetated areas as a substitute for stormwater being "transported primarily via vegetated conveyances" is an option
that has never been clearly specified in our rules or BMP manual. It has occurred on a case-by-case basis but it is
new. Therefore, we can't clearly define what is necessary on this project but we are hoping we can work with you to
come up with an alternative that we can present as a reasonable extension of our rules.
We are proposing that we can call the piping and discharging of stormwater to a swale or vegetated area a "curb
cut". The definition seems to allow some flexibility. It requires the following:
2H .1008 (g) Curb Outlet Systems. Projects that meet the low density provisions of Rules .1005 through .1007 of this Section may
use curb and gutter with outlets to convey the stormwater to grassed swales or vegetated areas prior to the runoff discharging to
vegetative filters or wetlands. Requirements for these curb outlet systems are as follows:
(1) The curb outlets shall be located such that the swale or vegetated area can carry the peak flow from the 10 year
storm and the velocity of the flow shall be non-erosive;
(2) The longitudinal slope of the swale or vegetated area shall not exceed five percent, where practicable;
(3) The side slopes of the swale or vegetated area shall be no steeper than 5:1 (horizontal to vertical). Where this is not
practical due to physical constraints, devices to slow the rate of runoff and encourage infiltration to reduce pollutant
delivery shall be provided;
(4) The minimum length of the swale or vegetated area shall be 100 feet; and
(5) In sensitive areas, practices such as check dams, rock or wooden, may be required to increase detention time within
the swale or vegetated area.
Let us know what you think.
From: Brent Cowan [imailtoIbcowan..isaacsgirp.coim]
Sent: Friday, May 15, 2015 7:22 AM
To: Devane, Boyd
Cc: Johnson, Alan
Subject: RE: General Question for Residential Streets in Stallings
Good morning Boyd. The "existing swales" are the existing creeks and drainage features (both regulated and
unregulated) that were on the site b/f development. They will remain in their current condition after our
development (i.e. no change due to grading) with the exception of the two road crossings where we have
added culverts to get the creeks under the roads.
Thanks,
Anthony Brent Cowan, P.E. F!IIF!IIDA P
The Isaacs Group, P.C.
8720 Red Oak Blvd., Ste. 420
Charlotte, NC 28217
P: 704-227-9402 F: 704-227-9403
3

Web: www.isaacsgrp.com
From: Devane, Boyd Emailt© b.©.yd devane(c _ncdenr,.g©v]
Sent:Wednesday, May 13, 2015 5:44 PM
To: Brent Cowan
Cc:Johnson,Alan
Subject: RE: General Question for Residential Streets in Stallings
Thanks. One thing I'm not clear on is what is the slope of the "existing swale"? Is it really a swale or just a ditch?What
will it be after grading occurs?
From: Brent Cowan [manta:bcowaln.u.isaacsgirp.coim]
Sent: Wednesday, May 13, 2015 4:49 PM
To: Devane, Boyd
Subject: FW: General Question for Residential Streets in Stallings
Boyd...see email below from Town of Stallings Engineer regarding ditch vs. curbed streets.
Thanks,
Anthony Brent Cowan, P.E., III OF A P
The Isaacs Group, P.C.
8720 Red Oak Blvd., Ste. 420
Charlotte, NC 28217
P: 704-227-9402 F: 704-227-9403
Web: www.isaacsgrp.com
From: Christopher Easterly [mailt© ceasterly@a_dmin_stal_lin.gsnc.or;]
Sent:Wednesday, May 13, 2015 3:32 PM
To: Brent Cowan
Cc: Lynne Hair
Subject: RE: General Question for Residential Streets in Stallings
Stallings requires curb and gutter with a berm on residential streets. A paved/unpaved shoulder with ditching is not
permissible.
Thanks.
From: Brent Cowan mailto:[e-mail].p.:c©m.]
Sent:Wednesday, May 13, 2015 3:22 PM
To: Lynne Hair; Christopher Easterly
Subject: General Question for Residential Streets in Stallings
Hi Lynne and Christopher,
I'm trying to determine if Stallings requires curb and gutter on residential streets. I've searched through your
UDO and didn't see curb and gutter addressed in Section 5.6.3. I also looked at your development standards
manual and see ditch cross sections for industrial and commercial streets, but all the residential cross sections
have curb. Can you please confirm if residential streets with roadside ditches are allowed in Stallings?
4

Thanks,
Anthony Brent Cowan, P.E., III IIIIE D' A R
The Isaacs Group, P.C.
8720 Red Oak Blvd., Ste. 420
Charlotte, NC 28217
P:704-227-9402 F:704-227-9403
Web- www.isaacsqrp.com
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VICINITY MAP: N.T.S.
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,,_ m 44E IMPERWIXIS AREA CALCIB,ATiDN;
ZONED C 8 I IMPERVIOUS AREA OF RO V)5: 121.572 SF. (2.79 AC.)
U4O COMER AL wl IMPERVIOUS AREA OF SIEEWAIXS: 19.149 S.F. (0.44 AC.)
/ r I IMPERVIOUS AREA PER L•IT: 6.5130 S.F. (0.15 AC.)
VEGETATED CONVEY
TOTAL IMPERVIOUS AREA (55 LOTS): 6,500(55) - 357.SOD SF (621 AC.)
TOTAL IMPERVIOUS AREA: 498,221 S.F. (11.44 AC.)
5 - ' _ Y' `L - - "-�� -- = -'— PERCENT IMPERVIOUS: -2295% < 24% (LOW IMPACT DEVELOP
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WATERSHED: CROONED CREEK
PROJECT DESCRIPTION:
THE PROJECT SITE IS LO ATED IN THE TOWN OF STAWNGS ANS IS AN
APPROXIMATELY 49.84 ACNE PARCEL ALONG SiEVENS MILL ROAD (AKA
STAWNGS ROAD). THE PI'APOSED PROJECT CONSISTS OF FIFTY FOUR (55)
APPROX. z87 AC FROM OUTSIDE
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USED: RE9DENRAL \- PNOJECT AREA DRAINS R THE CROOKED CREEK DRAINAGE BASIN.
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4 ' $�� , _ LEONARD S. RINDNER PLIC HAS PERFORMED 11 SfRFAN/WETLAND
. a DELINEATION /STUDY AND :ONFIRL�D WITH THE U.S. ARMY CORP OF ENGINEERS
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X REQUIREMENTS OF LOW I4PACT OV410PMENT (LESS THAN 24% IMPERVIOUS)
PER SECTION 303(A) OF THE TOWN OF STALINGS POST CONSTRUCTION STORM
i l T - _ A WATER ORDINANCE. THE `: TORM RUNOFF SHALL BE ILLECIED IN A
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COMBINATION OF GRASSDL SWALIS AND CATCH BASINS ALONG THE PROPOSED
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hY7 ` j C14NNEL AND DIPERSEC BEFORE ENTERING ANY REQUIRED BUFFER. THERE
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WEILAND IMPACTS THROU:H THE ARMY CORPS OF ENGINEERS AMID THE NORTH
UNINA DIVISION OF WJ TER OUMITY. THESE PROPOSED CHALET LN.ULVETEIS
WILL BE DESIGNED TO A( COMMOUTE THE 1I -YR STORM EVENT. LOW
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FLOOD CERTFICATON
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THIS S TO CERTIFY THAT A PORTION OF THE PROPERTY SHOWN ON THIS PLAT 1$-
N0. BY GATE REVISION
R:A HM PBDNC Dot: 12/3 /H
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P0516FOD {yApII LOCATED IN A SPECIAL FLOOD HAZARD AREA AS SHOWN ON MAPS PREPARED BY THE
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-
FEDERAL EMERGENCY MANAGEMENT AGENCY, FEDERAL INSURANCE ADMINISTRATION,
IM^el BE ITEM
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COMMUNITY NUMBER 37047255GOL AND FEMA MAP NUMBER 3710550IOI, BATED
FEBRUARY 19, 2014.
yec I•.IDD'
8]20 ' BOULEVARD, SURE 420
CHARLOTTE, TTE, N.C. 20217
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