SW6211203_Response To Comments_20220310

Double D Engineering, PLLC
Transmittal
March 10, 2022
Stormwater Program
NCDEQ Energy, Minerals and Land Resources
1612 Mail Service Center
Raleigh, NC 27699-1612
From: Lee Humphrey
RE: McCain Gas Station
Stormwater Permit Application SW6211203
Comment Response
Jim,
We received your letter dated February 9, 2022 with comments concerning the proposed McCain
Gas Station. In response, we offer the following;
l . This is acceptable.
2. We re -ran the storzxmwater dissipater calculation based on a 25 year storm which only
added V either direction to the pad and updated the erosion control sheet.
3. The easement has been revised and shaown on the Site plan, Grading and Erosion
Control plan sheets.
4. Line 22 has been revised. The detail has been revised on SCM-1.
5. Line 24 has been revised. The detail has been revised on SCM-1.
6. The infiltration rate was intentionally lowered to account for clogging of the soils that
will happen over time. A note has been added.
7. The storage elevation has been revised to elevation 437.30.
S. The surface area has been revised to 6560 sf.
9. Line 24 has been revised. The actual drawdown time has been included in the
calculations.
General Notes:
The existing gas station on the corner of Army Road and NC Hwy 211 is being removed. The
NC Hwy 211 widening project is going to take the buildings and the new store is being built to
150 S. Page Streef Southern Pines, NC 28387 PH: [phone]
Firm No. P-1275

Double D Engineering, PLLC
Transmittal
replace the existing one. The existing building area that is not under pavement will all be grassed
eventually.
We have called for a diversion berm to be installed diverting the proposed discharge from the
RCP pipe coming from the proposed. NC Hwy 211 widening project. This pipe is to be located
on the northeast corner of the project area. The proposed berm will be installed after the pipe is
installed. We are working with the NCDOT to relocate the proposed discharge to a different
location negating this need.
We will be uploading this data today and will overnight you the requested copies of the plans
and calculations. You will be getting a separate package from Carlo Pardo with the signed
supplement form.
If you have any questions or need any additional information regarding this project, please
contact this office.
Thank you.
150 S. Page Street Southern Pines, NC 28387 PIS: [phone]
Firm No. P-1275