SW5190701_Response to Comments_20190826

CSOESIGN &
ENGINEERING, PLLC
CLIENT -FOCUSED • COMPREHENSIVE • COST-EFFECTIVE
August 23, 2019
2537 E. L YON STATION RD, STE 102
PO BOX 361
CREEDMOOR, NC 27522
919-625-7368
Please find below responses to the comments provided on August 91", 2019 for the SILER SCHOOL
SQUARE (Permit# SWS190701) in bold green italics:
1. The project site is located within 5 miles of Siler City Municipal Airport (SCR). Please correct the
application and verify that all relevant rules and regulations are adhered to (Section II, 5).
Application updated.
2. It appears, from the provided letter from Dan LaMontagne, that the applicant will become the owner
of the project (Making the applicant a purchaser). Please correct Section III, 1.c to reflect this and
include a pending sales agreement.
Property has been conveyed to the applicant since the original applicant was submitted. Application
has been revised accordingly.
3. Since the project is high density and there is only one proposed SCM, the total number of drainage
areas should be 1. Please revise (Section IV, 9).
The total number of drainage area has been changed to 1.
4. Please include the stream name and classification for the drainage area. Please also remove the
extraneous drainage areas (Section IV, 10).
The total drainage area was changed to 1. The stream and classification for the drainage are were
also included.
S. Please include the original, signed and notarized O&M Agreement (Section V).
The original, signed and notarized O&M Agreement is now included with these revisions.
6. Please provide a delineation of the existing BUA, similar to the proposed BUA delineation included in
the stormwater management (Section VI, 7).
Pre -Development Impervious Map now provided.
7. Please provide details of the proposed SCM in the plan set (Section VI, 8.1). The Filterra- specific MDCs
cannot be verified based on the provided information.
Detail of Filterra has been provided.
8. Please delineate the wetlands on the plans or provide a note stating that no wetlands exist. Provide
documentation of the qualifications and identity of the individual who made this determination (Section
VI, 8, m).
19-023 — Siler Square Apartments (SW5190701)

2537 E. L YON STATION RD, STE 102
C DESIGN & PO BOX361
ENGINEERING, PLLC CREEDMOOR, NC27522
CLIENT -FOCUSED • COMPREHENSIVE • COST-EFFECTIVE 919-625-7368
Note #17 has been added to sheet C-1.6 indicating that there are no wetlands on the site.
9. Please show the drainage area to the SCM on the plans (Section VI, 8, o). Please also show the off -site
contour lines so the off -site drainage area may be verified.
Drainage Area for the SCM has been shown. Additional Mapping with GIS Topo and Google Street
View provided to confirm mapping of SCM DA.
10. Please include a soils report based on an actual site visit showing the seasonal high-water table
elevation for the area where the SCM is proposed (Section VI, 9).
According to the borings shown on sheet C-1.6, the boring log B-2, B-3, and B-9 do not record or
shown any indication of groundwater. The boring log B-3 being the closest to the filterra has been
included with the resubmittal along with the boring map.
11. Please provide riprap sizing calculations showing that the discharge point downstream of the outlet
of the SCM is stable during the 10-year storm (General MDC 4).
Rip Rap outlet protection calculations now shown for the final discharge point from the storm
drainage system that the SCM discharges to. These items previously required for Erosion Control and
NCDOT review/approval and provided in accordance with their standards.
12. Please include a maintenance access and easement for the proposed SCM (General MDC 8 & 9). The
easement should be shown on the plans.
Easement now shown on Sheet C 1.6.
13. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1 hardcopy of other
documents. Pdfs must be uploaded using the form at:
https://edocs.deg.nc.gov/Forms/SW Proiect Submittal
Revisions provided per the request.
C3 Design & Engineering, PLLC sincerely appreciates the opportunity to respond to these comments and
looks forward to discussing them with you further as needed. Please don't hesitate to contact me with
any further questions or comments you may have.
Regards,
Chad E. Abbott, PE
Principal Engineer
C3 Design & Engineering, PLLC
[e-mail]
19-023 — Siler Square Apartments (SW5190701)