WQ0005150_Authorization to Construct_20240625

v MCKIM&CREED
June 21, 2024
North Carolina Department of Environmental Quality
Division of Water Resources/NPDES
512 N. Salisbury Street, 91h Floor
Raleigh, NC 27604
ENGINEERS
SURVEYORS
PLANNERS
06496-00015
SUBJECT: Requesting the Authorization to Construct for the City of
Hendersonville WWTF Biosolids Thermal Dryer
Dear Mr. Tuvia:
We respectfully request the Authorization to Construct for the WWTF
Biosolids Thermal Dryer project for the City of Hendersonville's Wastewater
Treatment Facility, NPDES Permit No. NC0025534. This project involves a
facility modification to the Hendersonville WWTF consisting of the
construction of a new biosolids processing facility onsite and installation of a
new biosolids thermal dryer in the new facility.
The project consists of the construction of a new biosolids thermal drying
facility, the work for which includes, but is not limited to: demolition of
existing alkaline stabilization equipment including a lime day tank,
volumetric feeder, lime feed screw, solids processor, decking, stairs, and rail
system, and associated power and controls equipment; installation of new
dewatered cake conveyance equipment; installation of a new biosolids
thermal dryer system comprised of a dryer feed hopper, medium -
temperature direct fired belt dryer, dried biosolids discharge auger, dried
biosolids inclined screw conveyor, process blower, air heater, condenser,
ductwork, cooling tower, cooling tower pump, wash stand, associated
piping, instrumentation, electrical panel, and control panel.
The project also includes modifications to the existing covered storage shelter
8020 Tower Point Drive to enclose the southeast quadrant of the structure to house the new biosolids
thermal dryer and associated equipment, as well as enhancements to the
Charlotte, INC 28227 biosolids covered storage area with new concrete push walls and curtain
walls for dried biosolids storage. Other tasks involve replacing the existing
704.841.2588 covered storage shelter roofing, site grading, disposal of excess excavated
materials on -site, disposal of unsuitable excavated materials off -site at an
Fax [phone]
www.mckimcreed.com

approved site, new concrete pavement, curb and gutter installation, new
potable water service piping to the new facilities, modifications to the
existing potable water service, installation of new natural gas service, new
sanitary drainage installation and connection to the existing in -plant sanitary
sewer system, modifications to existing utilities and utility structures,
installation of new electrical systems for the new equipment, integration of
new instrumentation and controls into the existing facility SCADA system,
installation of a photovoltaic (PV) solar energy system, and establishment of
a site security network with security cameras and door access control devices.
The estimated construction times are 540 consecutive calendar days from
Notice to Proceed (NTP) to Substantial Completion, and 600 consecutive
calendar days from NTP to Final Completion. Attached is the submittal
package necessary for the Authorization to Construction. We are submitting
the following information:
• BINDER VOLUME 1 OF 2:
o Authorization To Construction Application
o NPDES Permit Part I
o Engineering Specifications
• BINDER VOLUME 2 OF 2
o Engineering Calculations and Supporting Documentation
■ Justification of Peak Hour Design Flow
■ Influent Pollutant Loading
■ Effluent Pollutant Loading
■ Sizing Criteria for Biosolids Thermal Dryer
■ Auxiliary Power Source Documentation
■ Appendix A — City of Hendersonville WWTF Biosolids
Thermal Dryer Basis of Design Report
■ Appendix B — Influent and Effluent Pollutant Loading
Supporting Documentation
• Processed Data
• Effluent BOD Data
• Maximum Month Peaking Factor
• Biosolids Generation Projections
■ Appendix C — Auxiliary Power Source Documentation
o Residuals Management Plan
Engineering Plans
Please do not hesitate to contact me with any questions or comments by
phone at [phone] or by email at [e-mail].
v EN CI<DA&CREED
G S SU 0 5 PLANNFRS

Thank you,
McKim & Creed, Inc.
Zachary Trammel, PE
Regional Manager
Cc: Adam Steurer, PE, Utilities Director, City of Hendersonville
Devin Owen, PE, Utilities Engineer II, City of Hendersonville
Brent Detwiler, PE, Public Services Director, City of Hendersonville
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GINS SURVFYORS PLANNFRS