WQ0032375_Comments_22020312

4fr? McK11\4CREED LETTER OF TRANSMITTAL
UPS Ground DATE: March 8, 2024
TO- NCDEQ—Division of Water Resources PROJECT NO: 07401-0001 TASK NO: 40
Municipal Permitting Unit
RE: Bluffs on the Cape Fear—Phase 6
1617 Mail Service Center
Raleigh, NC 27699-1617 Alternative Sewer Extension
Submittal for WQ0032375 MOD
A 1 I ELATION: Dale Crisp, PE TRANSMITTAL NO: 1 PAGE 1 OF 1
WE ARE SENDING: n Originals M Prints n Shop Drawings n Samples
n Specifications n Calculations n Other-
Quantity Drawing No. Rev. Description F5D Status
1 Comments Response Letter MAR , 024 G
2 Sets Revised Permit Drawing Sheets G
NiCKINYMPAES
Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid
E. Construction F. For Review & Comments G. For Approval H. See Remarks
Action Status Code: 1. No Exceptions Taken 2. Make Corrections Noted 3. Other
4. Amend & Resubmit 5. Rejected - See Remarks
REMARKS:
243 NORTH FRONT STREET,WILMINGTON,NC 28401(910)343-1048 FAX[phone]
File McKIM & CREED, INC.
Signed isdori4 004P
Brock Daniel
Senior Designer

4114?4?fr MCKIM&GRE ED
March 6, 2024 M&C 07401-0001 (10)
Dale Crisp, PE
Environmental Engineer II, Municipal Permitting Unit
NCDEQ - DWR
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Brunswick County — Bluffs on the Cape Fear — Phase 6 LPSS WQ0032375 Modification -
Comments / Response
Dear Mr. Crisp,
In response to your review comments emailed 2/6/24 referencing the subject project, we offer the
following responses:
1. On page 2 of 5 of the ASEA the proposed subject project is identified as 69 residential units
at 210 GPD / RU for a total proposed flowrate of 14,490 GPD, based on the previously
approved reduced flowrate for Brunswick County. However, on sheet 7 of the proposed
project engineering plans the table indicates 70 residential lots for a total sanitary sewer
flowrate of 14,700 GPD. Please clarify and revise.
Response: The number of residential units for the subject project should be 69. The table on
Sheet 7 (CU-101) was updated accordingly which now identifies a total daily flow of 14,490
gallons.
2. On sheet 8 and sheet 11 of the proposed project engineering plans at approximately Station
13+00 Red Raspberry Lane the plan view indicates a 6-inch water main crossing the
proposed 3-inch pressure sewer; however, the profile view does not show the water main
crossing or the required vertical separation of the two mains at the crossing point. Please
revise and label. There is also a reference on these plan sheets for "wetlands" and since the
proposed method of pipeline installation is directional drilling, this must be regulatory
wetlands. Please confirm the appropriate permits have been or will be applied for prior to this
construction.
Response: The utility crossing referenced in the comment is now shown in the profile view
with appropriate labels identifying the force main dip necessary to meet the required
minimum separation. Please see revised Sheets 8 (CU-701) and 11 (CU-704). As for the
wetland crossings, we have worked very closely with Davey Resource Group (previously Land
Management Group) since 2006 on all wetland and/or stream delineations, crossings and
impacts associated with this project. This time is no different. Since we are boring under the
wetlands, from uplands to uplands, no wetland or stream impacts are proposed and
therefore, no Section 404 permit is required.
3. On Sheet 9 of the proposed project plans at approximately Station 23+75 Fair Lakes Way
there is a storm sewer crossing under the proposed 2-inch pressure sewer, however the
minimum vertical separation of the crossing is not labeled. Please label.

• - ©ale Crisp, PE
NCDEQ - DWR
24-00015 The Bluffs on the Cape Fear-PH 6 NC0410045 Brunswick County Water System
March 6 2024
Page 2 of 2
Response: The minimum vertical separation at the utility crossing is now labeled per the
comment. Please see revised Sheet 9 (CU-702).
4. On sheet 10 of the proposed project plans at approximately Station 16+50 River Park Way
there is a storm sewer crossing under the proposed 3-inch pressure sewer, however the
minimum vertical separation of the crossing is not labeled and as shown on the profile, may
not be available. Please revise and label.
Response: The previous utility crossing referenced was shown incorrectly on the profile. The
pressure sewer, at this location, crosses a 30"RCP outfall pipe and will require a dip. The
profile was updated and is now labeled accordingly. Please see revised Sheet 10 (CU-703).
5. The LPSS and simplex pump station modeling results do not indicate the C factor utilized
when conducting the project design and analysis. Please provide this information
Response: A Hazen-Williams C factor of 130 was used for the modeling results provided.
Sincerely,
McKIM & CREED, INC. 004
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025503
Richard A. Moore, PE '°FticiNE��
Regional Manager �c'tiyR p°°A°°°�oo�,
cc: Project File 07401-0001
MCKIM&CREED