Poplin Meadows - Comment Response Letter - NCDEQ - 180803

1927 S1927 S1927 S1927 S. Tryon St, Suite 310. Tryon St, Suite 310. Tryon St, Suite 310. Tryon St, Suite 310
Charlotte, NC 28203Charlotte, NC 28203Charlotte, NC 28203Charlotte, NC 28203
PHONE [phone]PHONE [phone]PHONE [phone]PHONE [phone]
August 3, 2018
Via Electronic Mail

Corey Anen
NCDEQ DEMLR
Division of Energy, Mineral and Land Resources
1612 Mail Service Center
Raleigh, NC 27699

Re: 2nd SWM Review
Poplin Meadows
6008 Bonterra Village Way
Indian Trail, NC 28079
Union County
BE # NCC172107
SW Permit No. SW3180605

Bohler Engineering is pleased to submit on behalf of The Moser Group, the revised stormwater quality
plans for Poplin Meadows located at 6008 Bonterra Village Way, Indian Trail, North Carolina. The
following is our comment response letter addressing comments received from NCDEQ on July 6, 2018.
Each comment is addressed and responded to as follows:

Comment 1: Please submit a copy of the most recent deed to verify ownership of the site Noted

Comment 2: Please complete and submit a supplement E form for the wet pond. Noted

Comment 3: Please complete and submit a high density residential subdivision deed restriction form
Noted

Comment 4: General MDC 9 requires all SCMs and associated maintenance accesses on privately
owned land except for those located on single family residential lots to be located in
permanent recorded easements. Please revise the plan to show the easement.
Response 4: Easement has been added to plans. See sheet C-303 for easement location

Comment 5: The two wet pond details on sheet C404 show different crest elevations for the forebay
berm (624.5 vs 623.5). Please revise the details to correct this discrepancy.
Response 5: Both wet pond details referring to crest elevation of forebay have been updated to
match (624.5)

Comment 6: The average depth of the permanent pool, when calculated using the methods found on
pg 8 of the SDM Wet Pond Chapter (C-3) is below the minimum average depth of 3 feet.
Response 6: Because shelf is being included in average depth calculation, equation 2 was used.
See calculation on stage-storage calculations in stormwater report. Minimum
average depth of 3 feet achieved by lowering main pool bottom elevation.

Comment 7: The incremental storage in the wet pond main pool between el 622.5 and el 623.5 was
calculated incorrectly.
Response 7: Incremental storage calculations corrected, see stormwater report.

Comment 8: The SA/DA ratio used in the calculations was incorrect.
Response 8: SA/DA ratio corrected. See stormwater report for calculations. Average depth
calculated to be 3.0 feet. Therefore, at 65% impervious cover, SA/DA ratio is 2.30.

Comment 9: On the landscaping plan, please specify that the dam structure, including front and back
embankment slopes shall be vegetated with non-clumping turf grass and that trees and
woody shrubs shall not be allowed.
Response 9: Maintenance access road leading to pond OCS labeled as gravel (see wet pond detail
sheet). Landscaping note added to applicable area(s), see sheet L-2 for detail.

Should you have any questions regarding this project or require additional information, please do not
hesitate to contact me at [phone].

Sincerely,

Bohler Engineering

Michael Theberge, P.E.
Project Manager