WQ0024300_Additional Information_20210218

Graznak, Jenny
From: Ben Palmer <[e-mail]>
Sent: Thursday, February 18, 2021 11:25 AM
To: Mickey, Mike M
Cc: Graznak, Jenny; Fertenbaugh, Christyn L
Subject: [External] RE: Waterview Sewer Pump Station Modifications
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Good morning Mike. Responses to your information request are below in RED:
Please let me know if you have questions or require additional information. Thanks.
Ben Palmer, PE
Davis • Martin • Powell
p. 336.886.4821 x284 • m. 336.247.1203
Stability... Value... Experience... let our experience make yours better!
From: Mickey, Mike M <[e-mail]>
Sent: Tuesday, February 16, 2021 4:13 PM
To: [e-mail]
Cc: Graznak, Jenny <[e-mail]>; Fertenbaugh, Christyn L <[e-mail]>
Subject: Waterview Sewer Pump Station Modifications
Ben — The above Fast Track Sewer Application was received on February 10, 2021.
Based on a preliminary review, the application package requires the following clarification:
• The previous permit modification issued 4/22/20 increased the capacity of the Waterview pump station from
1,300 GPM to 1,550 GPM and added a third pump. This application is to re -rate the pump station to 2,500
GPM. Please explain how the increase in pumping capacity from 1,550 GPM to 2,500 GPM is achieved.
The three (3) existing pumps (identical) at the Waterview Pump Station are VFD controlled and currently
programmed speed -limited for a maximum output of 1,550 GPM, due to existing downstream gravity
limitations. Relocation of the forcemain discharge to the Penny Road Outfall will allow for full speed
operation (60Hz) of the pumps — the requested 2,500 GPM is based on two (2) pumps running, one unit out -
of -service.
• The application proposes to relocate the current Waterview pump station discharge to the existing 24-inch
Penny Road Outfall. Please provide calculations to support the availability of downstream capacity to handle
the flows from the pump station, per 15A NCAC 02T.0305(b)(2).
The Penny Road Outfall consists of 36-inch, 30-inch and 24-inch gravity lines. The existing Eastfork Pump
Station discharges at the upper -most end of the Penny Road Outfall, and the proposed relocated Waterview
forcemain will be located approximately 340 LF downstream of the Eastfork discharge point. Assuming that
the Eastfork (3,000 GPM) and Waterview (2,500 GPM) pump stations discharge simultaneously, combined
flow will be 5,500 GPM. Table below provides minimum slopes and full -pipe capacities for the various pipe
sizes along the Penny Road Outfall:
Pipe Size
Min. Slope
(%)
Pipe C :
(GP
36-inch
0.10
10,1
30-inch
0.10
6,1'
1

Minimal connections (<200 GPM) exist along the 30 & 24-inch segments of the outfall, so adequate capacity
exists within the existing outfall.
Please contact me at [e-mail] or [phone] if you have any questions.
Mike Mickey
Division of Water Resources
Department of Environmental Quality
336-776-9692 office
[e-mail]
450 W. Hanes Mill Road, Suite 300
Winston-Salem, NC 27105
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
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