20071826 Ver 1_More Info Received_20080122

Soil & Environmental Consultants, PA
236 LePhillip Court, Suite C Concord, North Carolina 28025 Phone: [phone] Fax: [phone]
www.SandEC.com
January 18, 2008
S&EC Project #5-1674
DWQ Project #07-1826
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly/Lia Myott
2321 Crabtree Boulevard, Suite 250 p ~~~~ t/ ~ O
Raleigh, NC 27604 L~ ~/
Re: Second Reply to the Division of Water Quality's Request for More Information JAN 2 2 2008
Shoffner NC 73 Project
Cabarrus County, NC DeNR•wA~RauAUn~
4dETLANOS AND S70RMWA'(ER BRANCH
To Whom It May Concern:
The purpose of this letter is to respond to your Request for More Information letter dated December 3,
2007. The original questions/requests are copied below as they appear within letter and are then followed
by our response.
Additional Information Requested:
1. Stormwater Management Plan:
The submitted application does not adequately address erosive forces from the discharge from the
stormwater basin. Specifically the basin which is further west on the project is in very close
proximity to the perennial stream running through the project. It appears from the plan that there
would be very little area to attenuate the force of the flow before it reaches this stream. Also, due
to close proximity there will be for construction of the basin. Also, due to this close proximity there
will be very little work area for construction of the basin. Please address how impacts to the
stream will be avoided during construction of the basin.
Attached please find plans from the project engineer for the proposed storm water structures
(including outlets) as well as their written comments/response. In addition, new
worksheets for the proposed level spreader are attached. Our initial submittal (PCN)
included the worksheets and O&M agreements for the wet ponds. A second submittal
included O&M agreements for a level spreader. Based on conversation with Mr. Love he is
of the opinion the western-most pond can be constructed leaving a 30' buffer from the
aforementioned perennial stream. This purpose of this submittal is to provide plans for a
level spreader that follows DWQ design criteria.
We anticipate that this answers items of concern from the DWQ "Request for More Information" letter. If
additional explanation is needed, please don't hesitate to call.
Sincerely,
v~~(.~~
Wendell Overby
NC Licensed Soil ientist
CC: Barry James, Carlton Burton
Attachments:
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
Raleigh Office:
11010 Raven Ridge Road
Raleigh, NC 27614
Phone: [phone]
Fax: [phone]

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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This corm must be filled ouf, printed and submitted.
The Required Items Checklist (Part !It) must be printed, frlled out and submitted along with all of the required information.
I. 'PRQJEGT'INFORMATION
Project name Shoftner
Contact name Wanda G. Fuller, PE
Phone number 704-553-8881
Date 01/16108 REVISED 1117/2008
Drainage area number Basin # i
II' DESIGN IC~FORMATION
For Levei Spreaders Receiving Flow From a BMP
Type of BMP Level Spreader
Drawdown flow from the BMP 0.44 cfs
For Level Spreaders Receiving Ftow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 inlhr storm
Time of concentration
Rainfall intensity,l0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a fitter strip or riparian buffer?
Other (specify}
Filter Strip or Riparian Buffer Characterization (if applicable}
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Slope (from level lip to to top of bank}
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 inlhr storm?
Length based on the 10-yr, 24-hr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
Length of the level lip
Are level spreaders in series?
Dc no# complete this section of the worksheet
ft2
ftz
Do not complete this section of the tivorksheet.
Do not complete this section of the worksheet.
cfs Dn not complete this sectt~;,n of the worksheet
min
inlhr Da not complete this section of the worksheet.
cfs Dn not complete this section of ttte woritsheRt.
{Y or N}
{Y or N}
n {Y or N}
vegetative strip
ft
ft
ft
ft
(Y or N}
340 sq ft
ftlcfs
(Y or N}
(Y or N}
Y (Y or N}
13.1 cfs
y (Y or N}
170 ft
N (Y or N}
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3
OK.
;tiVALUE!
C~K
Level spreader may not be mare than 130 feet lnng,
~~~
Parts I. and 11. Design Summary, page 1 of 2

Bypass Channel Design (if applicable}
Does the bypass discharge through a wetland?
Does the channel enter fhe stream at an angle?
Dimensions of the channel {see diagram below):
M
B
W
Y
Peak velocity in fhe channei during the 10-yr, 24-hr storm
Channel fining material
N (Y or h!}
Y
0 ft
2 ft
1 ft
8.73 efs
RtP RAP ~~
tt. ti~t'G't' '~~
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t 4------------- 5,
!
~ y ~
B ~
;1
------ ~ ----o
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Form SW4~1-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts t. and tl. Design Summary, page 2 of 2

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