NC0024911_authorization to construct_20000602

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
June 2, 2000
Mr. William Conner, P.E.
MSD Buncombe Co. WWTP
P. O. Box 8969
Asheville, North Carolina 28814
A1LT1.V;1F'J
'T 00
4�17i
NCDENR
Subject: Permit No. NCO024911
ATC Number 024911ACE
MSD Buncombe Co. WWTP
Buncombe County
Dear Mr. Conner:
The Division received a letter of request for Authorization to Construct on November 30, 1999. Final plans and
specifications for the subject project have been reviewed and found to be satisfactory. Authorization is hereby granted for the
installation of a sodium hypochlorite facility for disinfection. Specifically, this ATC allows:
• the installation of a sodium hypochlorite feed system and building
• the inclusion of standard spill prevention and control measures
Please be advised that effluent monitoring for residual chlorine is still required since sodium hypochlorite is a
chlorine compound. In addition, the MSD — Buncombe facility may be subject to a chlorine limit in the future, if
there is expansion of the wastewater treatment plant.
This Authorization to Construct is issued in accordance with Part III, Paragraph C of NPDES Permit No.
NCO024911 issued October 1, 1995 and shall be subject to revocation unless the wastewater treatment facilities are
constructed in accordance with the conditions and limitations specified in Permit No. NCO024911. Failure to abide by the
requirements contained in this Authorization to Construct may subject the Permittee to an enforcement action by the Division
of Water Quality in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. The issuance of this
Authorization to Construct does not preclude the Permittee from complying with any and all statutes, rules, regulations, or
ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction.
In the event that the facility fails 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.
The Asheville Regional Office, telephone number [phone], shall be notified at least forty-eight (48) hours in
advance of operation of the installed facilities so that an on -site inspection can be made. Such notification to the regional
supervisor shall be made during the normal office hours from 8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding
State Holidays.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Permit No. NCO024911
Authorization to Construct
MSD Buncombe County
June 2, 2000
Page 2
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 NPDES Permit,
this Authorization to Construct, and the approved plans and specifications. Mail the completed certification to: North
Carolina DENR-DWQ, NPDES Unit, 1617 Mail Service Center, Raleigh, NC 27699-1617.
One (1) set of approved plans and specifications is being forwarded to you. A copy of the approved plans and
specifications shall be maintained on file by the Permittee for the life of the facility. If you have any questions or need
additional information, please contact Jacquelyn M. Nowell, telephone number [phone], extension 512.
Sincerely,
/ Y-
1"err T. Stevens
cc: Central Files
NPDES Unit
Asheville Regional Office, DWQ (Attn: Max Harter)
Technical Assistance and Certification

MSDMetropolitan Sewerage District of
Buncombe County, North Carolina
W.H. Mull, P.E., General Manager
P.O. Box 8969, Asheville, N.C. 28814
Telephone: Area Code [phone]
Telecopier. [phone]
William Clarke, General Counsel
May 30, 2000
Ms. Jackie Nowell
North Carolina Division of Environmental
Division of Water Quality
Permitting Unit
1617 Mail Service Center
Raleigh North Carolina, 27699-1617
Brady M. Blackburn, Chairman
C. Michael Sobol, Vice -Chairman
Jackie W. Bryson, Secretarytrreasurer
Steven T. Aceto
Barbara A. Field
n David Gantt
U Elizabeth C. Graham
E. Glenn Kelly
Ben Pace
JUN 1 2000 S. Douglas Spell
W. Donald Venable
DENR - WATER QUALITY
POINT SOLRCE ERWiCH
Subject: Wastewater Treatment Plant Improvements, Sodium Hypochlorite Facility
Metropolitan Sewerage District of Buncombe County North Carolina
NPDES Permit No. NC1124911
ATC Number 0024911ACE
Dear Ms. Nowell:
Pursuant to your phone message on May 26, 2000, the following should address your questions.
Will you have extra pumps and parts, and where will they be stored? — We will have four
chemical feed pumps on-line. Each pump will be capable of delivering 89 gallons per hour,
(GPH), of sodium hypochlorite. The total dosage, at start-up, for an average daily flow of 23
MGD will be approximately 68 GPH. The dosage at plant capacity of 40 MGD will be
approximately 118 GPH. The piping arrangement is designed to allow each pump to draw from
any of the four tanks, and to deliver to any of the three dosing points. At any given time dosing
can occur at one, two, or all three dosing points. Also pumps can be run in tandem to deliver to
one dosing point. In effect one at least one pump will be sitting as a spare. A spare parts kit, with
items necessary for rebuilding the wet end of a pump, will be stored in the building.
2. What is the plan of action if there is any kind of problem with the lines, a release to the system?
— The system is designed to allow total dosage at all three dosing points, therefore, if a problem
occurs with one of the chemical feed lines it will be isolated, (valved off), and dosing will
continue at the other points.
If you have any questions please give me a call at 251-4781.
Sincerely
William P. Conner, P.E. Project Manager
cc: Max Haner
Tom Hartye

Metropolitan Sewerage District of
M S D Buncombe County, North Carolina
W.H. Mull, P.E., General Manager
P.O. Box 8969, Asheville, N.C. 28814
Telephone: Area Code [phone]
Telecopier: [phone]
William Clarke, General Counsel
February 29, 2000
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Ms. Jackie Nowell
North Carolina Division of Environmental Management
Division of Water Quality
Permitting Unit
1617 Mail Service Cinter
Raleigh North Carolina, 27699-1617
Brady M. Blackburn, Chairman
C. Michael Sobol, Vice -Chairman
Jackie W. Bryson, Secretarynreasurer
Steven T. Aceto
Barbara A. Field
David Gantt
Elizabeth C. Graham
E. Glenn Kelly
Ben Pace
S. Douglas Spell
W. Donald Venable
Subject: Wastewater Treatment Plant Improvements, Sodium Hypochlorite Facility
Metropolitan Sewerage District of Buncombe County North Carolina
NPDES Permit No. NC1124911
ATC Number 0024911ACE
Dear Ms. Nowell:
Pursuant to our telephone conversation on February 28, 2000, I am forwarding herewith one print each of
Drawings PP-1 through PP-4 of the above referenced project. Drawings PP-1 through PP-3 show the process
piping, tanks and pumps inside the building. Drawing PP-4 shows the dosing points and weir box details.
We request authorization to construct this project under N.P.D.E.S. Permit No. NC0024911.
If you have any questions please give me a call at 251-4781.
Sincerely
`//"
William P. Conner, P.E. Project Manager
cc: Max Haner, with enclosure
Tom Hartye
J-i MAR - 6 2000
1}FUR - WATER OUAUTY
"T

PULSAR
The pump is to be of the hydraulically balanced diaphragm type, wherein a volume -measuring
piston reciprocates within a cylinder and causes hydraulic oil to deflect a flat diaphragm. A
diaphragm actuated, cartridge design hydraulic performance valve shall function to replenish
hydraulic fluid as required, thus realigning the diaphragm to a precision controlled start point
for each stroke. The pump shall be able to withstand closed suction of discharge valves
without damage to the internals of the pump. The pumps shall be supplied to provide a
maximum output of 119.8 gallons per hour at 150 psig output. Each pump shall be supplied
with a digital readout of flow from the pump, an SCR drive and auto stroke positioning. If the
Pulsar by Pulsafeeder is provided, the manufacturer shall supply the Model DLCM controller
in a NEMA4X configuration. Pumps by other manufacturers shall be supplied with auto
stroke positioning on the pump as well as a wall mounted SCR panel to meet the specifications
herein. The wall mounted SCR panel shall be of NEMA 4X construction, 316 stainless steel,
with one panel per pump. Each panel shall contain a circuit breaker, fuses, 110 volt surge
protection, 4 to 20 ma surge protection, an SCR by Reliance or Baldor, a power on light, a
power disconnect, a pump H-O-A switch, a speed indicator for the pump which is being fed
from a tachometer on the pump, and a local remote switch for control of the pump. If the
Pulsafeeder DLCM is not used, the contractor is to supply a magnetic flowmeter to readout
the flow output of the meter pump.
Pumps shall be mechanical lost motion type flow control where a cam driven by the worm gear
actuates a reciprocating piston to drive the hydraulically actuated diaphragm.
The pump shall include a hydraulics diagnostics package, which shall provide instant visual
indications of normal hydraulic operations, system over -pressure, diaphragm integrity and
proper oil level. The hydraulic bypass valve shall be externally accessible for easy adjustment.
Pump shall be equipped with a manually actuated hydraulic purge valve that can be used to
validate air -free hydraulics, or so that diaphragm integrity can be easily verified without pump
disassembly.
The pump shall be designed to full metric compliance and is available with English or Metric
process connections.
The metered liquid will enter the reagent head at the bottom and exit at the top through gravity
seating ball type valves. These three -component valves shall be free seating type with valve
seats having knife edge contact and will be 4-point guided to accurately control vertical and
sideward movement. Spring loaded check valves will not be acceptable. Valve and seat will
be individually replaceable and sealed by o-ring or flat gasket. Valve assemblies will not
incorporate any threading other than the process pipe connection. Valves must be serviceable
without removing piping. Cartridge valve assemblies are not acceptable.

CHEMCAL TRANSFER AND MIXING PUMPS: The chemical transfer and mixing
pumps shall be seal -less and magnetically driven. The chemical transfer and mixing
pumps shall be capable of pumping 50 gallons per minute at 40' of head. The unit
shall have a 2 horsepower, 480 volt/3 phase/60 Hz motor, pump, pump support
brackets and other accessories ready for installation in outdoor, chemical duty
service.
The metering pump shall have a 1- 1/2" FNPT inlet, 1 " FNPT outlet, single
stage impeller, 316 stainless steel pickled and passivated pump materials, totally
seal -less, silicone carbide axial and radial bearings, samarium cobalt permanent
magnets, Teflon 0-rings in all applications, alloy C containment can, NEMA C face
motor mounting, and the pump must offer an enclosed adapter which offers secondary
containment.
The product being pumped must be allowed to circulate through the pump head
components in order to cool any heat rise induced by the magnetic eddy current in the
containment can. The magnetically driven pumps must be capable of withstanding
temperatures up to 200 degrees F and viscosity's up to 100 Centipoise.
The magnetically driven pump shall operate by having the drive magnetic
assembly fixed to the motor shaft. The driven magnetic assembly, which is attached
to the pump shaft, shall rotate the drive magnet as a result of the magnetic forces.
High torque capabilities must be provided through the samarium cobalt permanent
magnets with no coupling slippage allowed. An alloy C can must be provided in order
to separate the magnetic assemblies and contain any chemical liquid within tile pump
housing.
Fiberglass, plastic, or pumps of other materials other than pickled and
passivated 316 stainless steel or Alloy 20 will not be acceptable. Pumps must be
seal -less and must be magnetically driven.
One set of spare parts shall be provided for each pump and shall include:
One (1)
Inner bearing
One (1)
Thrust bearing
One (1)
Outer bearing
Six (6)
Bearing lock pens
One (1)
Motor (one motor total)
One (1)
Drive motor (one motor total for job)

0
Flat Bottom Annular Domed Top
Diameter
Approx. Wall*
Approx.
Closed Top
x Height
Thickness
Weight
Part No.
HNominal
(in.)
(in.)
(ibs.)
F082DT
8'x 6'4"
1/4
840
F083DT
8'x 9'
1/4
980F084DT
8' x 11'8"
1/4
1140
F104DT
4000
10'4'x71"
1/4-9/32
1075
F085DT
5000
8' x 14T'
1/4-9/32
1280
F105DT
5000
10'4" x 8'8"
1 /4-9/32
1206
F086DT
6000
8' x 1611 "
1 /4-9/32
1520
F106DT
6000
10'4" x 10'3"
1/4-11/32
1336
F126DT
6000
11'9"x8'1"
1/4-5/16
1375
F087DT
7000
8' x 197'
1/4-9/32
1710
F107DT
7000
10'4"x11'10"
1/4-11/32
1480
F127DT
7000
11'9" x 9'4"
1 /4-5/16
1500
F088DT
8000
8' x 227'
1 /4-11 /32
1900
F108DT
8000
10'4"x13'5"
1/4-11/32
1647
F128DT
8000
11'9" x 107'
1/4-5/16
1625
F109DT
9000
10'4" x 15'
1/4-11 /32
1813
F129DT
9000
11'9" x 11'10"
1/4-5/16
1768
F101 ODT
10000
10'4" x 167"
1/4-7/16
1988
F121 ODT
10000
11'9" x 131 "
1 /4-5/16
1910
F1012DT
12000
10'4" x 19'10"
1 /4-7/16
2390
F1212DT
12000
11'9" x 15'6"
1/4-3/8
2215
F1014DT
14000
10'4" x 23'
1/4-1/2
2820
F1214DT
14000
11'9" x 18'
1/4-7/16
2565
F1015DT
15000
10'4"x247"
1/4-1/2
3100
F1215DT
15000
111" x 19'2"
1/4-7/16
2750
F1216DT
16000
11'9" x 20'5"
1 /4-7/16
2935
F1218DT.
18000
11'9"x22'11"
1/4-1/2
3350
F1220DT
20000
11'9"x25'5"
1/4-1/2
3580
F1221 DT
21000
11'9" x 26'8"
1/4-1/2
3800
F1222DT
22000
11'9"x27'11"
1/4-19/32
4410
F1225DT
25000
11'9" x 317'
1/4-5/8
5550
F1230DT
30000
11'9"x37'9"
1/4-23/32
6950
'Walls are tapered
8' Diameter — Domed Top
Head Capacity = 450 \ 20"
--
Sidewall Gals/Inch = 31.3
10'4" and 11'9" Diameter — Annular Domed Top
A
fTop Head A Sidewall
—Dia. Capacity(gal.) Dim. (in Gals/Inch
10'4" 366 13 52.3
11'9" 607 _ 17 67.5
C
Chop -hoop Filament Wound
Flat Bottom, Annular
Domed Top Fiberglass Tanks
• Annular domed top tanks are designed
for atmospheric pressure only and must
be vented. Refer to venting specifica-
tions on page D5.
• Standard tank is designed for 1.3 specific
gravity material. 1.8 and 2.1 versions are
available upon request.
• All filament wound tanks include three lift
lugs.
• For accessories refer to pages D1-14.
• For resin selection see pages El-E4.
• For warranty information see page E5.
Bottom Head
B
Dia.
Capacity(gal.)
Dim.(in.)
8'
240
8
10'4
366
7
11'9"
607
9
NOTE: Tank bottom must be fully
supported and pad must remain level within
1/8" over a ten foot span. Consult a local
engineer for specific site requirements.
1
B
RAVEN INDUSTRIES, INC. Plastics Division Sioux Falls, SD

Metropolitan Sewerage District of
M S D Buncombe County, North Carolina
W.H. Mull, P.E., General Manager
P.O. Box ON9, Asheville, N.C. 28814
Telephone: Area Code [phone]
Telecopler. [phone]
John S. Stevens, General Counsel
November 22, 1999
SEWEq,,CFo`
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>E
� r �
Mr. David Goodrich
North Carolina Division of Environmental Management
Permitting Unit
Post Office Box 29535
Raleigh North Carolina, 27626-0535
Edmund R. Selby, Chairman
C. Michael Sobol, Vice -Chairman
Jackie W. Bryson, Secretaryrrreasurer
Steven T. Aceto
Brady Blackburn
Barbara A. Field
Elizabeth C. Graham
E. Glenn Kelly
Ben Pace
S. Douglas Spell
W. Donald Venable
Subject: Wastewater Treatment Plant Improvements, Sodium Hypochlorite Facility
Metropolitan Sewerage District of Buncombe County North Carolina
NPDES Permit No.. NC44249i 1
Dear Mr. Goodrich:
Submitted herewith, for your review, for the above referenced project, are the following items:
• Three copies of the site plan.
• Three copies of the Preliminary Engineering Report for the project.
• Three copies of the specification sheets on the pump and tank equipment.
As noted on the site plan the system is designed with three Sodium Hypochlorite application points.
One at the head of the chlorine contact chamber, one where the discharge from the intermediate
clarifier enters the influent channel to the final microscreens, and one at the final microscreen
influent channel immediately prior to entering the screens. This set up will offer maximum flexibility
for the system.
We request authorization to construct this project under N.P.D.E.S. Permit No. NCO024911.
If you have any questions please give me a call at 251-4781.
Sincerely
William P. Conner, P.E. Project Manager
cc: Max Haner, with enclosure
Tom Hartye
Roger Watson