NC0049867_Authorization to Construct_20011207

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TATE LANNING & ASSOCIATES, P.C.
CONSULTING ENGINEERS
CIVIL * MUNICIPAL
Ms. Susan A. Wilson, P.E.
NPDES UNIT
N. C. DENR - Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Improvements to Wastewater Treatment Facility
Town of Cleveland
ATC No. 049867ACX
NPDES Permit NCO049867
Dear Ms. Wilson:
J. Tate Lanning Jr., P.E. P.L.S.
Brian R. Leonard, P.E.
December 7, 2001
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POINT SOU
The improvements at the Town of Cleveland WWTP have been completed and I
enclose herewith my Certification as required by the ATC as issued to the Town of
Cleveland on July 27, 2001.
You are advised that the project was constructed in accordance with the approved plans
and specifications, with two (2) exceptions, as described below:
Aerator in Oxidation Ditch No. 1 --- A 5.0 HP floating rotor aerator (brush) was used in
lieu of the 7.5 HP aspirating aerator as originally specified. This change was approved
by Addendum during the bidding process. The higher 02 transfer efficiency of the rotor
was most attractive and resulted in slightly less horsepower. A copy of Addendum No.
1 is attached. Also attached are documents supplied by the manufacturer of the rotor,
S&N AIROFLO of Greenwood, MS. A copy of the approved pre -bid submittal from S&N
AIROFLO is attached, which includes specifications on the aerator.
_Blowers — The design operating conditions of 450 cfm @ 5.0 psi required in excess of
14 brake horsepower. Therefore 20 HP motors were used.
The attached certification includes the facilities as noted above. All other project
components are in accordance with the approved plans and specifications.
Yours very truly,
TATE LANNING & ASSOCIATES, P.C.
J. Tate Lanning, Jr., P.E.
,s Ls -�
JTUI
Enclosures: Certification cc: Town of Cleveland
Addendum No. 1
Submittal Data — S&N Airof'o Rotor Aerator
211 Six Forks Road - Suite 122 9 Post Office Box 18345 - Raleigh, NC 27619 - [phone] - Fax [phone]

s
r
It TATE LANNING & ASSOCIATES, P.C.
CONSULTING ENGINEERS
CIVIL • MUNICIPAL
CERTIFICATE OF PRO%
TO: NPDES UNIT
N. C. DENR - Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
J. Tate Lanning Jr., P.E. P.L.S.
Brian R. Leonard, P.E.
EC E OW E
oec - 7 2001
ALITY
0jNTRSOURC EgRAN
P01
PROJECT: Improvements to Wastewater Treatment Plant, Cleveland, NC
NPDES Permit NCO049867
ATC NO.: 049867ACA
Issued — July 27, 2001
PERMITTEE: Town of Cleveland
P. O. Box 429
Cleveland, NC 27013-0429
I, J. Tate Lanning, Jr., P.E. , as a duly registered Professional Engineer in the State
of North Carolina, having been authorized by the Permittee to observe periodically the
construction of the wastewater treatment plant improvements in Cleveland, NC do hereby
state that, to the best of my abilities, due care and diligence was used in the observation of
the following installations:
• One (1) — 5.0 HP, floating rotor aerator in Oxidation Ditch No. 1,
• Two (2) — 20 HP positive displacement rotary blowers rated at 450 cfm/5psi),
• 200 LF — membrane type, fine bubble diffusers,
• One (1) —125 KW standby power generator and automatic transfer switch, and
• All piping, valves, control equipment and appurtenances.
This statement is also based upon daily observations of the work as performed by the ORC
for the Town of Cleveland, Mr. Fred Summers, who reported to me on a regular basis
regarding the construction of the facilities
Date: December 6, 2001
North Carolina PE Certification No.: 25487
cc: Town of Cleveland
211 Six Forks Road - Suite 122 • Post Office Box 18345 • Raleigh, NC 27619 • [phone] • Fax [phone]

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Kerr T. Stevens, Director
July.27, 2001
The Honorable James A. Brown, Mayor
Town of Cleveland
100 North Depot St.
Cleveland, North Carolina 27013
1� •: '
� L
NCODENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Authorization to Construct Permit Issuance
ATC Number 049867AVf
Cleveland WWTP
NPDES Permit NCO049867
Rowan County
Dear Mayor Brown:
A letter of request for an Authorization to Construct (ATC) was received March 23, 2001 and
final plans and specifications for this project have been reviewed and found to be satisfactory.
Authorization is hereby granted for additional components at the Cleveland WWTP. Specifically. this
ATC allows the installation of:
• 1, 7.5 Hp aspirating aerator,
2, 15 Hp positive displacement rotary blowers (rated at 450 cfm/ 5 psi)
• 200 linear feet of diffuser
• 125 kW standby power with automatic switchover,
• all additional piping, valves, control equipment and appurtenances.
Once construction under this ATC has been completed and an Engineers Certificate has been
submitted, the permittee is authorized to operate the above components and discharge. The Town of
Cleveland's permitted flow of 0.27 MGD shall remain unchanged with this ATC.
This Authorization to Construct is issued in accordance with NPDES Permit No. NCO049867
issued January 25, 2000 and shall be subject to revocation unless the wastewater treatment facilities
are constructed in accordance with the conditions and limitations specified in the permit.
The sludge 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 Water quality.
In 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.
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 -TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 1 0% POST -CONSUMER PAPER
VISIT Us ON THE WEB AT http://h2o.enr.state.nc.us/NPDES

Mayor Brown NCO049867
Page 2 of 3
The Mooresville Regional Office, telephone number (704) 663 - 1699, shall be notified at least
forty-eight (48) hours in advance of operation of the installed facilities so that an in -place 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.
Upon classification of the facility by the Certification Commission, the Permittee shall employ a
certified water pollution control treatment system operator to be in responsible charge (ORC) of the
water pollution control treatment system. The operator must hold a certificate of the type and grade at
least equivalent to or greater than the classification assigned to the water pollution control treatment
system by the Certification Commission. The Permittee must also employ a certified back-up operator
of the appropriate type and grade to comply with the conditions of Title 15A, Chapter 8G, .0202. The
ORC of the facility must visit each Class I facility at least weekly and each Class 11, III, and IV facility
at least daily, excluding weekends and holidays, and must properly manage and document daily
operation and maintenance of the facility and must comply with all other conditions outlined in Title
15A, Chapter 8G, .0204. Once the facility is classified, the Permittee must submit a letter to the
Certification Commission which designates the operator in responsible charge within: (A) Sixty
calendar days prior to wastewater being introduced into a new system or (B) within 120 calendar days
of the following, (i) after receiving notification of a change in the classification of the system requiring
the designation of a new ORC and back-up ORC or (ii) a vacancy in the position of ORC or back-up
ORC.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for
the life of the facility.
The Operational Agreement between the Permittee and the Environmental Management
Commission is incorporated herein by reference and is a condition of this Permit. Noncompliance with
the terms of the Operational Agreement shall subject the Permittee to all sanctions provided by G. S.
143-215.6 for violation of or failure to act in accordance with the terms and conditions of this Permit.
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.
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 Certification to the NPDES Unit, Division of Water Quality, 1617 Mail Service
Center, Raleigh, NC 27699-1617.
One (1) set of approved plans and specifications is being forwarded to you. If you have any
questions or need additional information, please contact Ms. Susan A, Wilson, telephone number (919)
733-5083, extension 510.
Sincerely,
err T. Stevens
cc: Central Files
NPDES Unit - Permit File
Mooresville Regional Office, Water Quality
Technical Assistance and Certification, Tony Arnold
Tate Lanning, Jr., P.E. P.O. Box 18345 Raleigh, NC 27619

ATC SUNMARY
SCOPE
Cleveland WWTP
ATC No. 049867ACB
Third Creek, C
Yadkin Pee -Dee River Basin, 030706
Rowan County
The scope of the project includes the installation of a supplemental aerator in Oxidation Ditch No.
1, addition of diffuesed aeration and mixing in the aerobic digester, and standby power.
REVIEW SUMMARY
Executive Summary
The subject facility received an NPDES permit January 25, 2000. This is an existing facility.
Cleveland has had some compliance problems in the past - mainly due to the primary industry,
Freightliner Corp. (and high ammonia levels). Due to those previous problems, the town wishes
to add permanent source of additional aeration in Ditch No. 1.
Project Number: (theirs - unknown)
Applicant:
The Honorable James A. Brown, Mayor
Town of Cleveland
100 North Depot St. (street address for delivery of plans)
P.O. Box 429
Cleveland, NC 27013
Application/Plans Prepared by:
J. Tate Lanning, Jr., P.E.
Tate Lanning and Assoc., P.C.
211 Six Forks Road, Suite 122
Raleigh, NC 27619
Significant Dates:
Received: 3/23/01
RO comments: 7/20/01
Reviewed: 7/25/01
Project Location:
Rowan County
Quadrangle: E 16NW
Facility status: Existin
Wastewater source: Municipal
Do Land Disturbing Activities Exceed One Acre:
Additional Permit Requirements:
SEPA Requirements:
Is an EA required? No
Funding Source: unknown
Page 1

Estimated Project Schedule:
To start construct immediately upon receiving the ATC
Submissions:
• Letter of Transmittal
• Engineering Plans / Specs
Additional aeration for ditch no. 1:
1 - 7.5 Hp aspirating aerator
Per calculations, this aerator will supply an additional 360 #/day 02 (rated at 2# 02/Hp-Hr) to the
0.09 MGD ditch. [This is a "submerged impeller" type aerator. Ref. M&E p. 572, 3rdEd, 2-4 #
02/Hp - hr; calcs are conservative at 2 # 02/Hp-hr]. The existing brush aerator can supply 360#
02/day.
Current aeration provided appears to be less than recommended range (based on surface aeration
for mixing, < 0.75 Hp/ 1000 CF).
The existing temporary surface aerator will be removed and the new mixer/aerotor put in place.
Addition of diffused aeration to aerobic digester:
The air volume to the digester is mixing controlled. Total air needed is 428 cfm (based on M&E,
20-40 cfm/ 1000 CF) .
2 - 15 Hp positive displacement rotary blowers (each to supply 450 cfm at 5 psi). At this air flow
and 200 LF of diffuser line, the load should be 2.25 cfm/LF of diffuser [see engr. Calcs.).
�. wlo;�� sooty)
The existing surface aerator will be removed. � ��
Standby power:
T46 q 4or Eyrwoeo 4AivaAoTee, "`'I ASS s
Standby power, with automatic transfer switch will be supplied (125 KW); can run most
components (w/o duality) . pow eas j�VePL y TN WAt f kf e, PLAN
N� stoki tAWT vuTgca-;, & - IJ 15To P-Y or- OTT i ra5
Regional Office comments: No adverse comments were submitted by the regional office staff'
report signed 7/ 16/01).
Review Notes: Most items added should enhance the process. The impeller in the ditch will add to
the process. Per the engineer, the operator's want the diffused air in the digester (this may create
higher maintenance due to clogging of the diffusers, but I'm sure the operators are aware of that).
The standby power will be adequate to run minimum components.
ApV i� w R-c TT J .No ; $hs � o n1 ll'� K Go A VVZ5- T71 o tJ
VVI M lAn/Jt 09 .
Page 2

To: Permits and Engineering Unit
Water Quality Section
ATTN: Susan Wilson
Date: July 16, 2001
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT
STAFF REPORT AND RECOMMENDATIONS
--
-
County: Rowan
Permit No. AC049867 ACB
-
MRO No.: 01-72
PART I - GENERAL INFORMATIONNC
I. Facility and Address: Town of Cleveland WWTP
Ll
oP.O.Box
429Cleveland,
NC 27013
_-_--_
2. Date of On -Site Investigation (if conducted): N/A
Report Prepared By: Samar Bou-Ghazale, Env. Engineer I
4. Persons Contacted and Telephone Number: N/A
Directions to Site: From the jct. of US Hwy 70 and Main Street in the Town of
Cleveland, travel north on Main Street approximately 0.7 mile. Turn left onto Beaumont
Farms Rd and travel approximately 0.3 mile. Turn right onto Third Creek Church Rd and
travel approximately 0.7 mile. The WWTP is located on the west side of the road
approximately 100 yards before the bridge crossing Third Creek.
6. Discharge Point(s), List for All Discharge Points:
Latitude: 35°44'38" Longitude: 80°402'56"
USGS Quad No.: E 16 NW USGS Quad Name: Cleveland, NC
7. Site size and expansion are consistent with application?
Yes_X_ No_ If No, Explain: N/A
8. Topography (relationship to flood plain included): Slopes range from 2 to 3 %, the
WWTP is not in a flood plain.
9. Location of Nearest Dwelling: Approximately 100 feet from the WWTP site.

PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
Existing Treatment Facilities: The existing facilities consist of one headworks station
(with rotary bar screen and manual bar screen), one flow splitter box, two oxidation
ditches (one 180,000 gpd and one 90,000 gpd), two final clarifiers, one
chlorination/dechlorination basin, one ultrasonic flow measurement station, and one
aerobic digester with mechanical aerator.
2. Proposed Treatment Facilities: The proposed improvements consist of the addition of a
supplemental aerator in oxidation ditch no.1, a diffused aeration and mixing system in
the aerobic digestor, and an automatic standby power system.
3. Sludge Handling and Disposal Scheme:
a. If residuals are being land applied, please specify DWQ permit No.: WQ0011431
Residuals Contractor: Environmental Waste Recycling, Inc.
Telephone No.: [phone]
b. Residuals stabilization: PSRP
4. Treatment Plant Classification (attached completed rating sheet): Class IV
5. SIC Code(s): 4952
Wastewater Code(s): Primary: 01 Secondary: N/A
Main Treatment Unit Code: 10013
PART IH - EVALUATION AND RECOMMENDATIONS
The Permittee, the City of Albemarle, has applied for an Authorization to Construct a
supplemental aerator in oxidation ditch no.1, a diffused aeration and mixing system in the
aerobic digestor, and an automatic standby power system.
Pending final review and concurrence by P&E, it is recommended that the authorization
to construct be issued.
✓uw

IMPROVEMENTS TO
WASTEWATER TREATMENT FACILITY
Town of Cleveland, North Carolina
N PDES — NCO049867
ENGINEERIN(
ALCULATIONS
Prepared By:
TATE LANNING & ASSOCIATES, PC
Consulting Engineers
CAR
SEAL
3956
q �J).4
By: •
. Tate , r., P
March 16, 2001

CALCULATIONS
IMPROVEMENTS TO WASTEWATER TREATMENT FACILITY
Town of Cleveland, North Carolina
A. EXISTING FACILITIES
The Town of Cleveland operates a 0.27 mgd treatment plant which discharges into Third
Creek in the South Yadkin River Basin in western Rowan County. The NPDES Permit No.
is NC0049867.
Current limits (monthly averages) of the principal discharge parameters are as follows:
DESCRIPTION
MONTHLY AVERAGE
SUMMER LIMITS
April - October
WINTER LIMITS
November - March
Flow
0.270 mgd
0.270 mgd
BOD(5)
15.0 mg/I
30.0 mg/I
N H3-N
6.0 mg/I
12.0 mg/I
TSS
30.0 mg/I
30.0 mg/I
Fecal Coliform
200/100 ml
200/100 ml
Total Residual Chlorine (Daily Max.)
28 pg/I
28 pg/I
Dissolved Oxygen
5.0 mg/I
5.0 mg/l
The Cleveland treatment plant consists of the components listed below and shown on the
attached Schematic Flow Diagram.
♦ Influent Structure with Mechanical Rotary Screening Unit
♦ Flow Splitting Structure (Adjustable Rectangular Weirs)
♦ Dual Parallel Oxidation Ditches:
Ditch No. 1 - 90, 000 GPD Hydraulic Capacity
Ditch No. 2 - 180, 000 GPD Hydraulic Capacity
♦ Dual Circular Clarifiers (Parallel) — Peripheral Feed Type
♦ Chlorine Contact Tank with Gas Chlorination/Dechlori nation System
♦ Effluent Metering Station — Parshall Flume, Ultrasonic Transmitter & Remote
Totalizer / Recorder
♦ Aerobic Digester with 15 HP Mechanical, Surface -Type Floating Aerator
♦ Operations Control Building
Page 1 of 6

CALCULATIONS
B. PROPOSED IMPROVEMENTS
1. Supplemental Aeration Facilities — Oxidation Ditch No. 1
Oxidation Ditch No. 1 (0.09 mgd) was constructed in 1983 as the primary component of the
original wastewater treatment plant (0.09 mgd permitted capacity). Aeration in this ditch
was (and continues to be) accomplished by means of a 7.5 HP, 6' long, 28" diameter rotary
brush aerator. The aerator has a maximum oxygenation rating of 2.5002 / LF / Hour — or
360*02 / day at a nominal immersion depth of 6.1" and standard temperature / atmospheric
conditions. Operation is at 92 rpm (single speed). (See attached performance data —
National Hydro Systems, Inc.)
Oxidation Ditch No. 2 (0.18 mgd) was constructed in 1995 as part of a major upgrade of the
wastewater treatment plant. Aeration in this ditch is provided by means of two (2) 15 HP, 7'
long, 42" diameter rotary brush aerators. Each aerator has an oxygenation capacity of
1.54 02 / LF / Hour at standard conditions and immersion depth of 8.3 when operated at
44 rpm. Motors are dual speed and the rotors can be operated at 66 rpm, thereby
significantly increasing the oxygen capacity to 3.58* 02 / LF / Hour — or 3.58 x 7 x 2 x 24 =
1,203* 02 / day. (See attached performance data — Envirodyne Systems, Inc.)
During 1998 and 1999, the wastewater treatment plant experienced periods when the influ-
ent ammonia loading was unusually high. The rotors in Oxidation Ditch No. 2 were oper-
ated at high speed in order to impart oxygen at the rate required for nitrification. The oxy-
gen capacity in Oxidation Ditch No. 1 was inadequate to handle the high oxygen demand,
and a temporary floating aerator was used to provide supplemental air in this ditch.
The source of the high influent ammonia was the Freightliner Corp., the only industrial user
in the Town of Cleveland. The company has now taken steps to modify its process,
whereby the ammonia nitrogen concentration is now at "normal" levels. However, the
Town wishes to install a permanent source of additional aeration in Oxidation Ditch No. 1
so that the oxygen capacities in both oxidation ditches are balanced.
The Engineer recommends the installation of a new, 7.5 HP aspirating aerator to be
installed in Oxidation Ditch No. 1, at a location which is approximately halfway between the
existing brush aerator and the discharge weir at the end of the ditch. The small, temporary
floating aerator would be removed from service.
2. Diffused Aeration System for Aerobic Digester
The existing aerobic digester has a capacity of 80,000 gpd. The digester is "mixing con-
trolled" and air is currently supplied by means of one 15 HP mechanical floating aerator.
The digester configuration is an inverted truncated prism with 1:1 side slopes. The unit is
44'-1 " square at the top and 28'-4" square at the bottom. The maximum operating depth is
eight (8) feet.
Page 2 of 6

CALCULATIONS
The wastewater treatment plant operators report that the floating aerator tends to turn over
(capsize) when surface foam freezes during extreme cold temperatures. The operators
also indicate that the corner areas of the tank do not mix thoroughly and probably do not
receive sufficient air for volatile solids reduction.
The operators have requested that the Town install a diffused / aeration system in the
digester to improve volatile solids reduction and mixing.
The Engineer recommends the installation of dual 15 HP blowers and a system of mem-
brane -type fine bubble diffusers.
3. Standbv Power System
The wastewater treatment plant is not equipped with standby power facilities. The Town of
Cleveland wishes to install a standby power generator and automatic power transfer switch
which will enable the treatment plant to operate in the event of a power failure.
The Engineer recommends the installation of 125 kW generator and 400 A automatic
transfer switch.
Page 3 of 6

CALCULATIONS
C. CALCULATIONS
1. Aspirating Aerator — Oxidation Ditch No. 1
Maximum oxygenation capacity in the large oxidation ditch (Ditch No. 2 — 0.180 mgd) is
calculated as follows, based on standard conditions with clean tap water, and with both
rotors operating at high speed of 66 rpm.
02 = 3.58*02 I LF I Hour x 7 LF x 24 Hours = 601.4# 1 day per rotor
2 rotors = 2 x 601.4 = 1203*1 day -total
To achieve balanced oxygen capacity in both ditches, the total maximum oxygen capacity
for the small oxidation ditch (Ditch No. 1 — 0.09 mgd) should be:
1203 x 0.09010.180 = 6020/ day
The maximum available oxygen from the existing brush aerator in Oxidation Ditch No. 1 is:
02 = 2.50021 LF / Hour x 6 LF x 24 Hours = 360* / day
Therefore, the deficiency in oxygenation capability is:
602 - 360 = 2400 / day
A supplemental aeration capacity of 30V per day is recommended for the proposed
aspirating aerator.
The proposed aspirating aerator is the "Tornado" as manufactured by AEROMIX. The
transfer rate suggested for this unit is 2.0#O2 / HP-HR.
Max. 02 Transfer Capacity = 7.5 HP x 24 hrs x 2.0*02 I HP-HR = 360"02 / Day
This unit is acceptable, even if the transfer rate were as low as 1.65#02 / HP-HR.
(See attached performance data for "Tornado" Aerator.)
2. Aerobic Digester — Diffused Aeration System 4.
Aeration capacity in the aerobic digester must satisfy two conditions, namely: (1) air
volume for reduction of volatile suspended solids, and (2) air volume required for complete
mixing of the tank contents. The condition resulting in the greater air volume requirement
will govern.
Page 4 of 6

CALCULATIONS
a. VSS Reduction:
Data as taken from recent analysis is summarized as follows:
Influent BOD-5......................................................... 232 mg/I *
MLSS Oxidation Ditch..............................................4,980 mg/I
MLVSS Oxidation Ditch...........................................3,460 mg/I
Ratio — MLVSS / MLSS.................................................... 70%
Digester Volume ............................................... 80,000 gallons
Max. Sludge Age — Digester......................................112 days
Max. TSS — Digester..............................................17,200 mg/l
Max. VSS — Digester...............................................9,949 mg/1
Ratio — Digester VSS / TSS.............................................. 55%
* 13-Month Average — Jan. 2000 through Jan. 2001(ignoring Aug '00 low of 55 rng/1)
If it is assumed that the minimum temperature in the oxidation ditches is 15°C, the degree —
days affecting sludge stabilization are (112 / 2) x 15 = 840/ From Metcalf & Eddy, 3rd
Edition, the resulting anticipated volatile reduction would be 50 percent.
At the design flow of 0.270 mgd and influent BOD5 strength of 232 mg/l, the total solids
production would be:
0.270 mgd x 232 mg / I x 8.351* / gal = 5230 1 day
And volatile solids production would be:
523# / day TSS x 70% VSS/TSS = 3660 1 day VSS
At 50% reduction, the total VSS reduction equals:
3660 / day x 50% = 183* / day VSS reduced
Air volume required equals 2.3 lbs. oxygen per Ib. VSSR:
2.3#02 x 183# VSSR = 421 *03 / day
421#02 / (0.075# 1 CF Air x 0.232#02 / #Air) = 24,200 CF Air / Day
= 17 SUM Air Required for VSS Reduction
Page 5 of 6

CALCULATIONS
b. Mixing:
Air volume required equals 20-40 cfm per 1000 CIF of volume. (Metcalf & Eddy, 3rd Edition,
Table 12-24).
The maximum design air volume of 40 cfm / 1000 will be used.
Total air volume required for mixing:
q
80,000 gal / 7.48 gal / CIF / 1000 x 40 = 428 cfm.
c. Blowers:
Based on the above calculations, the digester is mixing limited.
The Engineer recommends the installation of two (2) 15 HP positive displacement rotary
blowers, each capable of supplying a minimum of 450 scfm at 5 psi. Blowers should be
equal to Roots 56 U-RAI. (See attached performance curves for ROOTS Blowers.) Blower
should be equipped with relief valve to open if pressure reaches 1.0 psi above the 5.0 psi
design pressure (6.0 psi — relief point).
d. Air Diffusion:
The Engineer recommends the use of membrane -type, tubular fine bubble diffusers, equal
to the diffusers as manufactured by AerResearch, Inc. of Humble, Texas. The total length
of tubular diffuser should be 200 LF. The system should be arranged and spaced as
shown on the drawings to afford optimum air diffusion. The system would be arranged to
create four (4) separate zones, each with a valve to enable isolation for maintenance and
repair.
Capacity and design data for the tubular membrane -type diffuser system is summarized as
follows:
Loading Rate = 450 CFM / 200 LF.........................2.25 CFM / LF of diffuser
Static Pressure on System ......................................... 3.5 psig
Operating Loss = 0.7 —1.0 psig - say: .................1.0 psig
Total Operating Pressure........................................4.5 psig
Therefore, 5.0 psig design pressure is okay.
Attachments: 28" Diameter Rotor — Performance Data — National Hydro Systems, Inc. (1 sheet)
42" Diameter Rotor — Performance Data — Envirodyne Systems, Inc. (1 sheet)
Aeromix Tornado — Performance Data (1 sheet)
Roots Blower — Performance Curves (1 sheet)
AerResearch — Diffuser Performance (1 sheet)
Page 6 of 6

FRITZ ENGINEERING LABORATORY Rle.200.82.763.1
Lehigh University
Sheet ...... I ...... of ......
Subject ............ A?..ipqh..AERATOR..ROTOR ................................................................. Date...q�p.tember 1982
.... ............... .......... ....................
......... ............. ENVIRODYNE SYSTEMS. INC. ................... ........ : .................. Party. 1, P
............. . .......................
1982 TEST RESULTS
STANDARD CONDITIONS
TAP WATER AT 200 C. ZERO DISSOLVED OXYGEN
760 mm Hg
. J. Usinowicz,,!,
. ............................
ApProved........................
n

MRS-001
'Specialists In Aeration and Mkin9 Equipment'
PERFORMANCE DATA
AEROMIX TORNADO Surface Aspirating
Aerator
OXYGEN TRANSFER CURVE
90
40
0
So
35
C
70
r
�1 30 N
O
y,
p
V
60
wty'
fr
25
N
50
N
C
N
20 p
30
15
%
O
20
0 Q
10
5
0
10
awes 5 15 30
50 100
3.75 11.25 2250
45.00 75.00
Power
MIXING CHARACTERISTICS
2.0
50.0
IS
1.0
0.5
11
0.0
0.2
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TATE LANNING & ASSOCIATES, PC
Consulting Engineers
P.O. Box 18345
RALEIGH, NC 27619
TEL: [phone]
FAX: [phone]
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SHEET NO. OF
CALCULATED BY �, DATE
CHECKED BY
SCALE
DATE

Town of Cleveland -=-
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100 North Depot Street
P.O. Box 429
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Cleveland, N.C. 27013 0
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March 12, 2001
Mr. David A. Goodrich
N. C. DENR — DWQ — NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Proposed Improvements to Town of Cleveland WWTP
NPDES Permit No. NCO049867
Dear Mr. Goodrich:
The Town of Cleveland desires to construct several improvements to our Wastewater
Treatment Facility. The consulting engineer for the project is Mr. Tate Lanning, P.E. of
Tate Lanning & Associates, P.C-
At its regular monthly meeting on March 12, 2001, the Board of Commissioners of the
Town of Cleveland took action to designate Mr. Tate Lanning as the authorized
representative for the Town of Cleveland in connection with the proposed Wastewater
Treatment Facility improvements. By virtue of this action, Mr. Lanning is hereby
authorized to act on behalf of the Town and to submit plans, specifications and other
supporting documents to N.C. DENR in order to obtain the required Authorization to
Construct.
Sincerely,
TOWN OF CLEVELAND
cc: Mr. Tate Lanning

TATE LANNING & ASSOCIATES, P.C.
CONSULTING ENGINEERS
CIVIL • MUNICIPAL
March 20, 2001
Mr. David A. Goodrich
N. C. DENR — DWQ — NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Proposed Improvements to Town of Cleveland WWTP
NPDES Permit No. NCO049867
Dear Mr. Goodrich:
J. Tate Lanning, Jr., P.E., P.L.S.
OR23VQ%
I
The Town of Cleveland, in Rowan County, desires to construct improvements to its
Wastewater Treatment Facility. The improvements are to consist of the following:
♦ Addition of supplemental aerator in Oxidation Ditch No. 1,
♦ Addition of diffused aeration & mixing system in Aerobic Digestor,
♦ Addition of automatic Standby Power System.
The Board of Commissioners of the Town of Cleveland has authorized me to act as the
agent for the Town in connection with the project. Therefore, I hereby request
Authorization to Construct the above -listed improvements and submit herewith for your
review the following documents in support of this request.
1. Letter dated 3/12/01 from Mayor James A. Brown designating Tate Lanning as the
Town's authorized representative.
2. Construction Drawings — labeled "Final Plans — Not for Construction" (3 Sets).
3. Bidding Documents — labeled "Final Documents — Not for Construction" (3 Sets).
4. Engineering Calculations (2 copies).
5. Flow Schematic (2 copies).
Please contact me by telephone if any additional information is required to facilitate your
review of this project.
Yours very truly,
TATE LANNING & ASSOCIATES, P.C.
J. Tate Lanning, Jr., P.E.
JTL/I
Cc: Town of Cleveland
211 Six Forks Road • Suite 122 • Post Office Box 18345 • Raleigh, NC 27619 • [phone] Fox [phone]