NC0024911_authorization to construct_19891117

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street ! Raleigh, North Carolina 27611
James G. Martin, Governor November 17, 1989 R. Paul Wilms
William W. Cobey, Jr., Secretary Director
Mr. William H. Mull, Engineer-Manager
MSD of Buncombe County
P. 0. Box 8969
Asheville, North Carolina 28807
SUBJECT: Buncombe County MSD
Permit No. NC0024911
Authorization to Construct
Wastewater Treatment Facilities
EPA Project No. C370391-08
Buncombe County
Dear Mr. Mull:
The final plans and specifications for the subject project have been
reviewed and found to be satisfactory.
Authorization is hereby granted for modifications to the existing 40
MGD wastewater treatment facility to consist of the following items:
A non-potable water supply system to consist of a raw water pump
station and a 174 GPM non-potable water treatment system including
flocculation dissolved air flotation sand filtration system, an alum
storage tank, an alum feed pump, a polymer feed tank with an electric
mixer and a polymer feed pump, dual non-potable water service pumps,
and dual hydropneumatic tanks.
A constant pressure water reuse pump station with three (3) 1,300 GPM
turbine pumps, one (1) 200 GPM turbine pump and a flow meter with
strainer.
Modifications of the existing two (2) 100 foot diameter digestion tanks
including removal of existing tops, existing piping, existing draft
tubes; and installation of new per.th gas piping/mixing, new recircula-
tion piping, two (2) new dual membrane reticulated dome tops; modifi-
cation of existing digester control house including dual 25 Hp circu-
lation pumps, dual water to sludge heat exchangers, and four (4) 200
SCFM positive displacement digester gas blowers; and a new 2,283 square
foot generator (digester gas) building with four. (4) 400 GPM recircula-
P.O. 13ox 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Ar irmativc Action Employer

tion pumps, dual water to water heat exchangers, dual 2,800,000 BTU/HR
sludge heaters, dual heat engines with 450 KW generators, three (3)
digester gas filters, and modification of three (3) existing gravity
thickened sludge pumps to yield 360 GPM capacity.
A new sludge handling facility with 25,920 square foot heated building,
to house two (2) 6,000 gallon bulk liquid polymer feed equipment;
sludge dewatering equipme:ut with four (4) two-meter gravity belt
thickeners, two (2) 240 GPM gravity belt thickened sludge pumps, three
(3) two-meter belt filter presses, three (3) 70 GPM belt dewatered
sludge pumps, two (2) two-meter ultra press filters, and two (2) dry
cake positive displacement feed pumps, with a thermal converter system
including dual preheat blowers, an air to air heat exchanger, dual
fluidizing air blowers, a 17 foot diameter fluidizer bed thermal
converter, venturi gas scrubber with dual scrubber ash pumps, sr_ 18
foot diameter ash thickener, dual 125 GPM thickened ash pumps, a
building drainage/sidestream pump station with three (3) 825 GPM
submersible pumps, the lime stabilization system including lime
storage, a 10 foot diameter weight hopper, dual lime slakers, dual 150
GPM sludge grinder pumps, a 3,750 gallon lime mixing tank with a 7.5 Hp
mixer and dual lime transfer pumps, three (3) lime slurry transfer
pumps, z 14 foot diameter slurry stabilization and storage tank with 15
Hp mixer; a 600 KW steanc turbine generator system including boiler
feedwater equipment, deaerating heater, waste heat boiler economizer
and the steam turbine, associated yard pipe, electrical work and site
wort:.
Do not proceed with construction until the Authorization-to-Award
package, EEO, and MBE documentation/certification have been reviewed, and
you are in receipt of our approval, if Federal funding is desired for
project construction.
The permittee shall employ an actively St:,-te certified wastewater
treatment plant operator to be in responsible charge of the wastewater
treatment facilities. Such operator must hold a valid State Certificate of
the grade at least equivalent to the classification assigned to the waste-
water treatment facilities by the Certification Commission. When a new
chief operator must be obtained to be in responsible charge of the new
facilities, it is required that this be done by the time the construction of
the facilities is 50i complete.
The Authorization-to-Construct is issued in accordance with Part III,
Paragraph C of NPDES Permit No. NC0024911, issued June 15 , 1989 and shall
be subject to revocation unless the wastewater treatment facilities are
constructed in accordance with the approved plans, specifications, and
supporting documents; and are in compliancy: with the conditions and
limitations specified in Permit No. NC0024911.
This Authorization. to Construct does not imply approval- of the use of
the existing sludge storage lagoon, as an ash storage lagoon. A separate
submittal with all supporting documentation requesting permission to use the

existing sludge storage lagoon as an ash storage/disposal lagoon must be
presented for review and approval to the Water Quality Section of the
Division of Environmental management prior to placing the thermal converter
into operation.
The permittee shall have an acceptable sludge analysis and a sludge
E.P. to�:icity analysis which have been approved by the Division of Environ-
mental Management, Water Quality Section prior to the disposal of any Sludge
from the new wastewater treatment plant. Copies of the analyses, supporting
documents, and approvals shall be submitted to the Division of Environmental
Management's Asheville Regional Office.
The sludge and or ash generated from these treatment facilities must be
disposed of in accordance with G.S. 143-215. 1 and in a manner approved by
the North Carolina Division of Environmental Management. The disposing,
selling or free distribution of wet, dried, composted sludge or sludge-like
materials from wastewater facilities without prior review and approval by
this Division is illegal.
During the construction of the proposed additions/modifications, the
permittee shall continue to properly maintain and operate the existing
wastewater treatment facilities at all times, and in such a manner, as
necessary to comply with the effluent limits specified in the NPDES Permit.
Tr, the event that the facilities fail to perform satisfactorily,
including the creation of nuisance conditions, the Permittee shall take
immediate corrective action, including those as may be required by this
Division, such as the construction of additional or replacement wastewater
treatment or disposal facilities.
You are reminded that it is mandatory for the project to be constructed
in accordance with the North Carolina Sedimentation Pollution. Control Act,
and, when applicable, the North Carolina Dam Safety Act. in addition, the
specifications must clearly state what the contractor's responsibilities
shall be in complying with these Acts.
One (1) set of final approved plans and specifications is to be
forwarded to you, one (1) set to the Environmental Protection Agency (EPA) ,
and one (1) set to the Corps of Engineers.
A copy of the approved plans and specifications shall be maintained or.
file by the Owner for the life of the project.
Upon completion of construction and prior to operation of this
permitted facility, a certification must be received from a Professional
Engineer certifying that the permitted facility has been installed in
accordance with the approved plans and specifications. Mail the Certifica-
tion to the Permits and Engineering Unit, P. 0. Box 27687, Raleigh, North
Carolina 27611-7687. (Engineer's Certification. Form is attached.)

4 -
If you have any questions or need additional information, please
contact Mr. bill Hoffman, at (919) 733-6900.
S Pcerely, i
R. Paul Wile
Attachment
CGM:vk
cc: Hendon Engineering
Mr. Dennis Ramsey
Mr. Don Safrit
Mr. Jyh C. Lin, Health Services
Asheville Regional Office
CE - Charlotte
EPA
Mr. Tom Fahnestock
Mr. Don Evans
Ms. Valerie Helms
Mr. Cecil Madden
Mr. John Campbell
EMU
GFF