SW3180304_Ltr Patterson Kontane_20180321

SHABELDEEN ENGINEERING, PA
3145 TATE BLVD ● BOX A ● HICKORY, NC ● 28602 PHONE: [phone]
CIVIL/WATER/SEWER/ENVIRONMENTAL FAX [phone]
CONSTRUCTION ADMINISTRATION [e-mail]

Ltr Patterson Kontane

March 13, 2018
Mr. Robert Patterson, PE
NC Dept. of Environmental Quality
DEMLR Stormwater Program
512 N. Salisbury St.
1612 Mail Service Center
Raleigh, NC 27699-1612

SUBJECT: Kontane Warehouse Additions - Stormwater Permit Application
Dear Mr. Harrell:
On behalf of May Rivers Properties, LLC (Owner), Shabeldeen Engineering, PA (SE) is submitting the
following material for referenced project your review and approval.
1. Stormwater Management Permit Application Form
2. Check for $505.00
3. Operation and Maintenance Agreement
4. Construction Plans
5. Calculations
Project Description
May River Properties, LLC is the owner of the Kontane Logistics site located on Crawford Road in Statesville
(PIN 4756209729). The facility is an existing trucking operation with a warehouse building and loading docks
in the middle of the property. The proposed improvements include the addition of two (2) new
warehouse/transfer buildings of approximately 60,000 sf and 165,000 sf along with additional parking and
access/fire lane. The 60,000-sf building and small parking lot will be constructed in the front of the property
along Crawford Road. The 165,000-sf building, parking, and fire lane will be constructed in the rear of the
property.
The project will be considered “high density” and therefore subject to post-construction stormwater treatment.
The site must also comply with the City of Statesville stormwater detention requirements. The existing facility
was constructed in 1988, therefore only the new impervious area should require treatment. The City of
Statesville agreed to the same for peak attenuation.
Since the proposed project will involve two separate parts of the site, we will be allowed to the treat the
equivalent combination of existing and proposed impervious areas. Figure 1 shows the new impervious areas
and the area that will be treated. Table A lists the new impervious areas and Table B lists the areas to be
treated, which excludes the area between the existing and new warehouses and includes the existing north
parking lot. The area between the two warehouses will be diverted off-site with the new drainage system
Mr. Robert Patterson, PE Page 2 of 2
Kontane Warehouse Additions – Stormwater Permit 3/14/2018

Ltr Patterson Kontane

(structures S-21 through S-26). The New Impervious Area is 7.57 acres while the equivalent area to be treated
is 8.02 acres.
The areas to be treated will be piped to the proposed Wet Pond in the northeast corner of the site. As required,
the pond will contain a Forebay and Main Pool. The discharge will be controlled by a 3’x3’ pre-cast concrete
control structure as shown on the plans with the following critical components:
1. 2-inch orifice at the Permanent Pool elevation of 901.50
2. Weir slots at the Temporary Pool elevation of 904.25
3. An 18-inch HDPE discharge pipe
The 2-inch orifice will discharge the treatment volume in 3.76 days. The weir slots will provide emergency
overflow. Based on the accompanying stormwater model results, the maximum water level in the pond for
the 100-Year, 24-Hour storm event with the initial water level at 901.50 will be 903.05. This is more than 1-
foot below the weir elevation (Temporary Pool Elevation). The storage volume is recovered in approximately
3 days. The 18-inch discharge pipe will convey runoff to the existing 48-inch outfall at the north property
boundary.
Attached are calculations for the Wet Pond design criteria per Section C-3 of the design manual. All the
criteria are met.
I appreciate your review and approval of this project. If you have any questions, please do not hesitate to
contact me.
Sincerely,

Dan Shabeldeen, P.E.