SW6201005_Response to Comments_20230606

■
sl e
March 21, 2023 Ii solutions
NCDEQ Division of Water Quality civil engineering I land surveying
Attn: Jim Farkas
512 N. Salisbury Street
Raleigh, NC 27604
RE: SW6201005 &SW6220902, Wood Lake II Subdivision Phase I & 11, Storm water Re-
submittal, Hoke County, North Carolina
Jim,
The review comments dated March 20, 2022 have been addressed as noted below:
Please correct the following with SW6201005 (Phase I Minor Modification):
Supplement-EZ Form:
a. Cover Page:
i. Line 2— Please use the project area (13.29 ac) instead of the total
property area (19.42 ac). Updated
b. Drainage Area Page:
i. Lines 5 & 6— Please use the project area (578,912 sf) instead of
the total property area (845,721 sf). Updated
ii. Line 18— NOTE: Line 18 = Line 8/ Line 5 = 130938 sf/578,912 sf=
22.6% # 24%. Please revise as needed. Updated
Please correct the following with SW6220902 (Phase II Application):
- Swale Design—Swales 4, 6, 7, 8, & 11 have a permanent matting. Please ensure
that the design information in the Supplement-EZ Form reflects this (specifically,
the Vallowable, Vactual, and Flow Depth). NOTE:The Vactual should not exceed
the Vallowable (Vallowable can be increased based on the matting rating). Calcs
updated and attached. I also included copies of the liners to reflect the
maximum allowable velocity.
- While not required, you may wish to explain (in the additional information
section on the low-density page) that the 100 ft minimum length downstream of
the curb outlet system is being provided partially by Swale and partially by
vegetated receiving area so the swale may be shorter than 100 ft long. Typically,
either swales or vegetated receiving areas are used to meet this requirement so
clarification may be useful to help avoid potential issues for the permittee in the
future. This clarification has been added to the low density supplement and
included.
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1910-426-6777 fax [phone]
On time,every time. I www.4Dsitesolutions.com

If you have any questions or comments, please contact me at your earliest convenience.
Sincerely,
4D Site Solutions Inc.
Scott Brown, PE
[e-mail]
Enclosure
2