NC0021156_Adjusted Daily Sewage Flow_20160223

PAT MCCRORY
DONALD R. VAN DER VAART
Water Resources
ENVIRONMENTAL OVAL'IY S. JAY ZIMMERMAN
lhrr .r,
February 23, 2016
Danny Jackson, City Manager
City of Mount Holly
PO Box 406
Mount Holly, NC 28120
Subject: Adjusted Daily Sewage Flow Rate Approval
City of Mount Holly
Mount Holly WWTP(NC0021156)
Dear Mr.Jackson:
On January 26, 2016, the Division of Water Resources (Division) received an adjusted daily sewage flow
rate(flow reduction) request that would apply to all future residential connections tributary to the Mount
Holly WWTP (NC0021156).
In accordance with 15A NCAC 02T .0114(f)(2), the Division has evaluated the request and based on the
data submitted,the Division hereby approves for use by the City of Mount Holly an adjusted daily sewage
design flow rate with the following conditions:
• The flow reduction is granted for future residential connections tributary to the system.
Permitted but not yet tributary connections can be granted the flow reduction, however a permit
modification request must be submitted to the Division.
• The flow reduction is applicable to residential single family dwellings only.
• The minimum flow for 1 and 2 bedroom dwellings shall be 140 gallons per day.
• Each additional bedroom above two bedrooms shall increase the volume by 70 gallons per day
per bedroom.
• This flow reduction shall not apply to sewer extension applications and/or permits for any other
public or private organizations whose wastewater flows are or might become tributary to the
Mount Holly WWTP(NC0021156).
Given that this flow reduction will apply to all future residential connections within the City of Mount
Holly's service area per the prescribed requirements above,the Division reserves the right to request the
City re-evaluate the approved flow reduction utilizing current wastewater flow data, meeting all
requirements outlined in 15A NCAC 02T.0114(f)(2).
All other aspects of the permitting process remain unchanged, and all applications must be in compliance
with the statues, rules, regulations and minimum design criteria as certified by the owner and engineer.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh,North Carolina 27699-1611
919 807 6300

City of Mount Holly
February 23, 2016
Regardless of the adjusted design daily wastewater flow rate, at no time shall the wastewater flows
exceed the effluent limits defined in the NPDES Permit for the treatment facility or exceed the capacity of
the sewers downstream of any new sewer extension or service connection(s).
The granting of this flow reduction does not prohibit the Division from reopening, revoking, reissuing
and/or modifying the flow reduction as allowed by the laws, rules,and regulations contained in 15A
NCAC 02T, NCGS 143-215.1, or as needed to address changes in State and/or Federal regulations with
respect to wastewater collection systems, protection of surface waters and/or wastewater treatment.
If you have any questions, please contact Michael Leggett at (919) 807-6312, or via e-mail at
[e-mail].
Sincerely,
\\) )46
for S.Jay Zimmerman, P.G.
Director, Division of Water Resources
by Deborah Gore,Supervisor
Pretreatment, Emergency Response,Collection System Unit
cc: David E.Johnson, PE—Utilities Director, City of Mount Holly
Mooresville Regional Office Regional Office,Water Quality Section Regional Operations
Water Resources Central Files: WQCS000059 & NC0021156
PERCS(electronic copy)