SW6080804_Summary of Groundwater Levels_20081002

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*S&ME
Celebrating 35 Years
f973 • 2008
October 2, 2008
O C T 0 3 2008
Bojangles' Restaurants, Inc.
9432 Southern Boulevard
Charlotte, North Carolina 28273
Attention: Mr. Claude Clark
Director of Engineering and Construction
Reference: Summary of Groundwater Levels
Proposed Bojangles' Restaurant
US Hwy 401/West Edinborough Avenue
Raeford, North Carolina
S&ME Project No. 1351-08-132
Dear Mr. Clark:
S&ME has submitted a Phase I Environmental Site Assessment dated July 1, 2008, and a
Geotechnical Engineering Report dated July 9, 2008. These services were performed in
general accordance with our Master Services Agreement for Geotechnical and
Engineering Services dated August 27, 2007 and our proposal acceptance for (Proposal
No. 1351-20312-08) dated May 30, 2008.
As requested by Mr. Bob Spalding of the Isaacs Group, S&ME is providing additional
subsurface information for the above referenced site. We understand Mr. Spalding needs
groundwater levels at the site to address questions the North Carolina Department of
Environment and Water Quality has raised regarding design of a Rain Garden.
As indicated in Section 5.2.5 of the Environmental Report, groundwater levels ranging
between 30.15 to 37.75 feet were measured in five of the six on -site monitoring wells.
The remaining well, which only extended to 24 feet, was measured dry. The
geotechnical borings were also measured dry, however Section 3.3 of the Geotechnical
SEME, INC`/ 9751 Southern Pine Blvd / Charlotte, NC 28273-5560 / p 704.523.4726 / f 704.525.3953/www.smeinc.com

of Groundwater Levels
Bojangles' Restaurant
SWE Project No. 1351-08-132
Report reported water levels as shallow as 30 feet based on the water levels in the well.
These measurements represent groundwater levels at the time of our exploration. Some
seasonal variability in the groundwater level is typical, however should be limited to less
than 5 or 10 feet. It should be noted that based on the subsurface conditions, "perched"
water conditions could be present at the site following large rain events.
S&ME, Inc. appreciates the opportunity to assist you during this phase of the project. If you
should have any questions concerning this report or if we may be of further assistance,
please contact us.
Very truly yours,
S&ME, Inc.
Duane D. Bents, P.E.
Geoteclmical Services Manger
DDB/MS/cs
Copies Submitted: 4
a.
Mohsen Sefat, P.Ya 4
Senior GeoteclmicN
N.C. Registration No.
SEAL
20738.
S/1351 /Projects/2008/08-132

BOJANGLES- COMMENTS
NCDENR DIVISION OF WATER QUALITY
Comment
Number
I Summary of Comment
How comment was handled
1
Person Signing Application must be Vice President
INew Storm Water Application included in this submittal
Supporting Calculations to show velocities in swales to
2
bioretention area 1 fps or less for mulch cells.
Included in the revised Calculations in this submittal.
Per telephone conversation with Robert Patterson, changed the cell to bermuda or Fescue
3
Media depth of 2 ft needs to be inreased to 3 ft due to plants.
grass only in order to leave 2 ft of media fill.
A minimum of 4" of clean sand must be provided between
4
media and washed stone.
Corrected on Sheet C1.2 in the cross section view.
We have requested that Geotech go out to gather this information on -site, however they
Geotechnical Report Information does not contain required
were not able to get out there before the deadline. We are still waiting on these results and
5
information for SHWT.
would like to request additional time for this.
Please delineate any wetlands on the site: or add note that
6
states there are none.
Note included in the Narrative on Sheet C1.0 stating no wetlands.
Show on plans how the roof area is draining and that it will not
7
drain to the "cell".
Added Roof Drain linetype in the Legend on Sheet C3.0 for clarity.
Per telephone conversation with Robert Patterson, Provide information for BMP Area in DA1
Information provided in the table of Part 111.9 of form SW U-101
and then provide information for Total Area of site in DA2. This was corrected on the new
8
to be corrected.
Application enclosed in this submittal.
To prevent clogging, construction sequence should require
Bioretention cell not to be installed until its drainage area is
9
stabilized.
Included this in the construction sequence - Note # 11
Per telephone conversation with Robert Patterson, Due to constraints on the site Robert
Volume in excess of 1" treatment volume must bypass the cell
would not require 30 vegatative filter strips if runoff WQv is increased 10%. Revised the
10
and be evenly distributed along a 30' vegetation filter.
Prop. Rain Garden Calculations on Sheet C1.2 to show that the WQv was increased 18%.
Please show proposed drainage easement connected to a
11
public R.O.W. around the bmp for access and Maintenance.
Included Proposed Storm Easement on all sheets.