HomeMy WebLinkAboutAMMENDMENT NO 3 OMI
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AMEND1v1ENT NO.3
TOTRE
AGREE11ENT FOR OPERATIONS,
MAINTENANCE AND MANAGEMENT SERVICES
FOR
AUGUSTA, GEORGIA
This~NDME No.3 to the Agreement dated July 20, 1999 is made and entered into this
/9,; day of ' 2001, between Augusta, Georgia, a political subdivision
'of the State of G orgia, whose address for any formal notice is 530' Greene Street, Room 801,
Augusta, Georgia 30911, Attention: City Administrator (hereinafter "Owner"), and Operations
Management International, Inc. (hereinafter "aMI"), with offices at 6060 South Willow Drive,
Suite200, Greenwood Village, Colorado 80111-3333, whose address for any formal notice is Post
Office Box 6607, Englewood, Colorado 80155-6607.
NOW, THEREFORE, Owner and OMI agree to amend the Agreement as follows:
1. Article 2.57 is hereby added in its entirety:
2.57 Retrofit existing structures with new or rehabilitated equipment, on existing grounds
andlor in existing/improved buildings, to make improvements at the James B. Messerly
Water Pollution Control Plant (WPCP) capable of improving the reliability of the
wastewater treatment plant consistent with OMI's Facility Retrofit Summary Plan dated
May 9,2001, attached and included herein.
2. Articles 2.57.1 through 2.57.3 are hereby added in their entirety:
2.57.1 OMI shall purchase equipment from recognized vendors.
2.57.2 SiIice not all of the project funding has been identified, it is envisioned that
OMI will execute the various components identified in the Facility Retrofit
Summary Plan as several independent projects, as ftmding becomes
available.
2.57.3 OMI will submit to the City's representative a detailed scope of work,
schedule and fee for each subcomponent project, and shall not initiate work
until obtaining a written authorization to proceed.
2.57.4 It is envisioned that aMI will function as the general contractor and self-
perform the majority of the construction for some of the subcomponent
projects. However, in some instances, OMI will subcontract work
subcomponents to specialty contractors.
2.57.5 Compensation for said services will be dependant upon the method by
which OMI performs the project. A not-to-exceed cost of seven million
- 1 -
nine hundred and thirty-five thousand Dollars ($7,935,000) provides for all
tasks identified as Category 1 priority.
2.57.5.1 For those projects where aMI serves as the General
Contractor and self-performs the majority of the work, OMI's
compensation shall be based upon OMI's actual direct costs plus a
fifteen percent (15%) markup for administration, overhead and
profit.
2.57.5.2 For those projects where OMI manages the overall effort
and the majority of the construction is performed using a
specialized subcontractor, OW's compensation shall be based upon
OW's actual direct costs plus a five percent (5%) markup for
administration, overhead and profit.
2.57.5.3 The not-to-exceed price identified in Paragraph 2.56.5 is
contingent upon aMI being given a notice to proceed on a
minimum of fifty percent (50%) of all Category 1 tasks within 6
months of the effective date of this amendment, and a notice to
proceed on all remaining tasks within 6 months thereafter.
3 Article 4.12 is hereby deleted in its entirety and replaced with the following Article 4.12:
4.12 Compensation for the Equipment purchases and Design/Build Retrofit services
included in Article 2.56 shall be invoiced to the City of Augusta as follows: OW
will submit invoices for Work completed to date and materials and equipment
delivered and stored on-site or off-site. Compensation for these services shall not
be included in the Base Fee of this Agreement. Payment for these services shall be
in accordance with Article 5.2 of this Agreement.
All other terms and conditions remain in effect in accordance with the original Agreement.
Both parties indicate their approval of this Agreement by their signatures below.
Aut~~~d S: _..~~., :.-.//;"
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,E. Fori'e~t Forbes../
Vice President
OPERATIONS MANAGE11ENT
INTERNATIONAL, INC.
Date: /3 ,L1V(j ~/'
\TTEST:
~cWi~Yfe:
\ \ )~ ,~~
Bob Young. \ 0
Title: MaY9r
AUGUSTA, GEORGIA
Date ~
ATIESTIIjH~uf4A1W
Clerk
-2-
OMI
James B. Messerly WPCP
Facility Retrofit Summary Plan
Prepared for
Augusta, Georgia
May 91 2001
I. Introduction and Background
The purpose of this memorandum is to identify critical components at the James B. Messerly Water
Pollution Control Plant (WPCP) in need of expedited replacement to ensure compliance with the more
stringent NPDES Pennitlimitations recently outlined by GA EPD. The following chart displays a
comparison of the significant conventional constituents impacted.
Old Permit
30
30
17.4
2.0
New Permit
10
20
1.5
5.0
OMI's focus regarding the retrofit proposal is to address items that would be considered major repairs to
immediately improve the overall treatment process reliability. Attachment 1 summarizes the specific tasks
categorized into two groups and prioritized based on the potential impact of perfonning the task. The two
categories are defined as:
1. Necessary for compliance with current NPDES Permit.
2. Further enhances process reliability and requires consideration to reduce risk of
noncompliance.
All assumptions, design basis, and capital costs provide an order-of-magnitude economic analysis of tasks
to be performed. The purpose of this program. is to reduce the Owner's overall risk and liability by
. providing a mechanism to implement these critical repairs and equipment rehabilitation on a fast track
schedule.
II. Description of Existing Conditions
Augusta's James B. Messerly WPCP is pennitted to meet tertiary treatment limits at the final effluent
discharge in Butler Creek. The current facility utilizes preliminary treatment via climber-type bar screens
and pista-grits for grit removal. Preliminary treatment is accomplished using rectangular settling basins.
Secondary treatment occurs via the activated sludge process and circular secondary clarifiers. Chlorine is
used for disinfection prior to discharge to the manmade treatment wetlands. For the purposes of this
memorandum the solids handling processes are excluded from evaluation due to rehabilitation projects
currently underway.
As indicated in the Master Plan, the magnitude of necessary improvements at the James B. Messerly WPCP
are significant. Following is an assessment of the condition of equipment to be retrofitted as part of this
proposal.
Primary Treatment
The primary treatment system includes the primary clarifiers, the primary sludge pumps and the scum
pumps. Both North and South Plants have primary treatment systems. The primary clarifiers remove
settleable solids from the screened and degritted wastewater. The solids collect on the bottom of the basins
and are conveyed to the sludge hopper at the upstream end of the basin by chain-and-flight collectors. The
.collectors consist of fiberglass flights that traverse the width of the basin and are connected on each end to
the drive chain that pulls them along the bottom of the basin. The chain-and-flights return to the
downstream end of the basin as a part of a loop and pull floating material to the scum collectors. The
primary sludge pumps transfer the collected solids to the anaerobic digesters. The scum pumps pump the
scum to a straining device (Rotostrainer) located at the headworks.
The South Plant primary treatment system was originally installed in 1968 and the North Plant system in
1981. Expected useful life for these types of equipment: 20 to 25 years for the clarifier equipment (drives,
chain~and-flight, and cross collector), 15 to 20 years for the primary sludge pumps, and 10 to 15 years for
the scum pumps. All of the equipment at the South Plant primary clarifiers is at the end, or has exceeded,
its expected useful life. The equipment at the North Plant is also approaching the end of its useful life.
Condition Assessment - North Plant
The following comments summarize the evaluation of the primary treatment system at the North Plant.
1. Two of the primary clarifiers are out of service. The wear shoes are worn out. The drive mechanisms
are corroded and need to be replaced.
2. The flights are a combination of channel and sigma shaped units. The sigma units are 4 times as strong
as the channels units. A common shaped flight board that is more durable than both identified should
be used.
3. The flight chain and sprockets are made of different material (plastic and steel) causing premature wear
on the plastic chain. The existing equipment needs to be replaced with components made of similar
material, preferably plastic.
4. The scum removal system is not functioning and should be replaced with an entirely new system. The
scum pumps have exceeded their useful life, have become maintenance problems, and should be
replaced.
5. The primary sludge pumps have exceeded their useful life and given the current amount of upkeep
should be replaced.
Condition Assessment - South Plant
The following comments summarize the evaluation of the primary treatment system at the South Plant.
1. Primary Clarifier No.6 is out of service and liquid from Primary Clarifier No.5 was leaking into the
empty clarifier through a construction joint. There are indications of leaking walls at several points
around the perimeter of the primary clarifiers.
2. While the primary clarifier drive mechanisms at the South Plant are new additional the substructure is
in need of replacement.
3. Given the equipment age and repeated chain and flight failures documented over the past 2 years new
units are needed.
Secondary Treatment
The secondary treatment system includes the aeration basins, aeration blower systems, RASfW AS
pumping, and secondary clarification. As discussed in the Master Plan, both North and South Plants have
secondary treatment systems.
The North Plant secondary treatment system was originally installed in 1976 as an oxidation ditch. The
secondary clarifiers and WAS Pumping Station No.1 also date from 1976. The diffused aeration system,
aeration blowers, and RAS Pumping Station No. 1 were added in 1984. The South Plant secondary
2
TABLE 1
Secondary Treatment System Estimated Useful Life
Estimated Estimated Remaining
Useful Life Useful Life
Component Year Installed (Years) (Years)
Ceramic Diffusers
North Plant 1984 15 4-5
South Plant 1981 15 0
Aeration Blowers
North Plant 1984 15 - 20 4-5
South Plant 1981 15 - 20 2
RASNJ AS Pumps
North Plant 1984/1976 10-15 010
South Plant 1981 10-15 0
Secondary Clarifiers
(mechanisms and
auxiliary systems)
North Plant 1976 20 - 25 1
South Plant 1981 20 - 25 1 - 6
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.treatment system was constructed in 1981. Useful life for the secondary treatment system components is
estimated in Table 1. .
Condition Assessment - North Plant
The following comments summarize the evaluation of the secondary treatment system at the North Plant.
1. Primary effluent is split among three aeration basins. The flow to each basin is not measured. Flow
measurement should be added.
2. At the time of the evaluation, Aeration Basin No.3 was out of service with much of the basin aeration
piping disconnected. The diffused aeration system in the North Plant needs to either be replaced or
repaired.
3. At the time of the evaluation, Blower No.8 was dismantled. Also, there was no grease in the blower
suction control valves, and all control functions are manual. The blowers are approaching the end of
their useful life and their condition indicates they should be replaced. Automatic controls should be
installed to operate the blowers. The new controls could be phased-in as capacity needs dictate.
4. Despite their age, the RAS pumps looked to be in good condition. The pump building needs a second
entrance. The RAS pumps are constant speed; two variable frequency drives (VFDs) should be added
so that RAS flow to the aeration basins can be more closely matched to process needs. The RAS pump
suction lines need to be modified so that single pumps can be dedicated to specific clarifiers. The
pumps noW draw from a common header and it is not possible to control withdraw81s from a specific
clarifier.
5. Plant staff report problems with operating the WAS pumps. It appears that the pumps have difficulty
meeting their flow requirements when high RAS flows are required. The WAS pumps have exceeded
their useful life, and also because of capacity problems, should be replaced. The flow meter should be
repaired.
3
6. Flow split from the aeration basins to the secondary clarifiers is accomplished by yard valves. No flow
metering is provided. Consideration should be given to providing weirs in a splitter box accomplish the
flow split.
7. The final clarifier weirs and scum box have settled. This results in uneven flow over the effluent weirs
and flow constantly enters the scum box. A piece of the decking was missing from the center island
adjacent to the drive. The sludge control weirs are very difficult for plant staff to operate making it
difficult to positively control sludge removal from the clarifier. Consideration should be given to
replacing the secondary clarifier mechanisms with "tow-bro" type mechanisms.
Condition Assessment -South Plant
The following comments summarize the evaluation of the secondary treatment system at the South Plant.
1. The South Plant has four parallel aeration basins fed by a common influent channel. The channel
should be analyzed for proper flow distribution and modifications made as needed. MLSS samples
could also be taken from each basin to determine how well the flow splits are occurring.
2. At the time of the evaluation, one of the aeration basins was dewatered revealing dismantled air lines.
Also, surface surges were evident on the two basins in service indicating that diffusers had come lodse
or broken. The aeration system in all four basins needs to be inspected for loose or broken diffusers
. and broken or dismantled pipe needs to be repaired or replaced. More efficient diffusers are available
and should be considered for replacement.
3. The RAS and WAS pumps show signs of age; corrosion, evidence of spills, and leaking seal boxes.
Flow metering does not work and VFDs should be added to both sets of pumps. The pumps and valves ..
need rehabilitation and flow meters and VFDs should be added.
4. Flow is distributed to these clarifiers by means of yard valves as well. The valves should be replaced
with a more positive weir splitting arrangement.
5. The final clarifier weirs are not level and an elaborate series of dams and cutoffs have been installed to
manage the clarifier effluent flow. The effluent weirs are in poor condition and the gear boxes should
be replaced. Consideration should be given to replacing the final clarifier mechanisms as a whole with
a newer, more efficient mechanism.
Miscellaneous Systems and Facilities
The following plant systems and facilities were also identified as needing modification; upgrade, or
replacement.
1. Doors: Most of the plant doors need to be replaced due to corrosion.
2. Handrail: Problem handrail has been previously identified in a few locations but generally needs to be
replaced throughout the plant due to corrosion and noncompliance with OSHA standards.
3. Electrical Distribution: Many motor control centers (MCCs) are located in exterior cabinets and are
severely corroded. The MCCs should be replaced and located in buildings.
4. Flow Splits and Measurement: Lack of proper flow splitting and measurement has been identified at
several of the unit processes. Plant staff has added numerous ultrasonic flow meters to get a better
pictu.re of plant operations, but a flow distribution and measurement plan should be developed for the
facilitY... H ,
5. Plant Air System: Needs to be upgraded.
6. Plant Control System: The facility needs an updated plant control system to allow monitoring and
remote control of plant processes. A control system by Honeywell has been purchased for system
automation.
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7. Laboratory: The fume hoods and walk-in incubator needs replacement.
III. Description of Proposed Equipment Retrofit
The new mechanisms, and other enhancements such as mid-radius baffling, wall baffles (the North Plant
secondary clarifiers have wall baffles), energy dissipating inlet, properly sized flocculation well, and high
capacity scum removal should significantly improve performance.
The descriptions indicated below are presented as part of this proposal and further define the scope of
retrofit work proposed.
Catelwrv One Items
New handrailing. At the North Primary Clarifiers (#1, 2, 3, and 4), OW has included costs to add toe
boards to the existing aluminum handrail only. We have not included cost to add new handrail where none
now exists. At the South Primary Clarifiers (#5, 6, 7, and 8), OMI has included costs to add handrails
necessary to meet OSHA requirements, which include replacing the existing handrail and adding handrail
to the exterior where the walkway is greater than 42-inches above he ground. Additionally, we have
included costs to remove and replace defective grating at that strUcture. At the South Aeration Basins ( #4,
5, 6, and 7) we have included costs to install toe boards on all existing handrail where applicable. We have
not planned to replace any grating at that structure.
South Secondary Clarifiers. Remove and replace clarifier mechanisms. Modify concrete structure as
required to accommodate Envirex Tow-Bra mechanisms. Remove existing launders and blocked weir
segments and replace the weirs and baffles as necessary. The potential exists to revert to the initial
. peripheral weirs with the installation of stamford baffles and a determination will be made following an
engineering assessment as part of the replacement project.
North Secondary Clarifiers. Remove and replace clarifier mechanisms. Modify concrete structure to
accommodate Envirex Tow-Bra mechanisms. Existing Weirs and Baffles appear to be in satisfactory
condition.
North and South Primary Clarifiers. Remove and replace chain and flight sludge collectors, cross
collectors, scum collectors, sprockets, shafts, stub-shafts, and drives.
Primary Sludge Pumps, North and South Plants. Remove and replace four number (4) eXIstmg
reciprocating plunger pumps with two number (2) new reciprocating plunger pumps and two number (2)
Dual Disc Diaphragm Pumps.
Primary Clarifier Plug Valves. Remove and replace four number (4) buried mechanical joint plug valves
at the South Plant and remove and replace twenty (20) number eight (8) inch plug valves at both North and
South Plant Primary Clarifiers.
Electrical Rehabilitation. Remove all existing exterior motor control centers and replace with new motor
control centers located in a new masonry electrical building and all associated rewiring and conductor
tenninal reconfiguration and duct bank as required to completely reestablish current electrical capacity to
all existing and new equipment under this rehabilitation.
Wetlands Effluent Channel. Furnish and install aggregate filled geoweb cellular confinement system at
the wetland effluent channel to mitigate site solids intrusion in the effluent outfall process stream.
Aeration Basin #3. Remove all existing plastic air diffuser header piping and ceramic diffusers and replace
with new plastic header piping configured for EDPM membrane diffusers and rehabilitate all pneumatic
control valves.
5
HV AC System. Rehabilitation of existing Administration Building HV AC system to provide reliable and
cost effective comfort control of the Administration Building HV AC System.
Cate2'orv Two Items
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Plant Reuse Water System. Provide associated pumps, piping, electrical power and control to establish a
reuse water system that will provide washwater to the Belt Filter Presses, the gravity belt thickeners and the
chlorine facility.
South Aeration Basin Upgrade. Remove existing under-grid aeration system, construct baffle walls in
each aeration cell and install new under-grid aeration system conslsting of Envirex dual-air fine bubble
diffusers, and provide air-flow controls. '
New Splitter Box (Primary to Aeration). Construct new cast-in-place concrete splitter box and associated
piping and gates, to provide new flow control for South Plant mixed liquor.
Digester Cleaning. Evacuate and dispose of all sludge and grit accumulation in digesters #3, 5 & 6.
Jet Mix System for Digester #5. Install owner provided Jet mix nozzles and Vaughn Chopper pump and
construct Jet Mix System assembly with contractor furnished piping and materials. '
Digester #3 Cover. Remove and dispose of Digester number three floating cover and replace with
Conservatek fixed "Alumadome" cover.
Digester # 6. Sandblast, patch and paint two existing floating duo-dome digester covers. Digester cleaning
to be done under previously identified task item.
New Splitter Box (Aeration to Secondary). Construct new cast-in-place concrete splitter box and
associated piping and gates, to provide new flow control for South Plant Aeration Effluent.
New Splitter Box (Aeration to Secondary). Construct new cast-in-place concrete splitter box and
associated piping and gates, to provide new flow control for North Plant Aeration Effluent.
R.A.S. Flow Meters. Install two (2) precast concrete vaults outside the R.A. S. pump stations on the R.A.S.
discharge lines, and install one each twenty-four (24) inch magnetic flow meter for the North Plant and two
(2) twenty-four (24) inch magnetic flow meters for the South Plant. Each flow meter will have above
ground local display for each meter.
Relocate Septic Truck Unloading Facility. Construct cast in place concrete dump facility upstream and
near the headworks.
Removal of Gas Sphere. Demolish and dispose of existing unit that is coated with lead based paint.
IV. Cost-Effective Analysis
The cost estimate developed is presented in Attachment 1. OMI is prepared to initiate tasks identified as
Category 1 priorities in Attachment 1 for the proposed cost of $7,935,000 (Seven Million Nine Hundred
and Thirty-five Thousand Dollars).
V. Non-Economic Comparison
All non-economic indicators favor proceeding with the recommended improvements. As stated
previously, all equipment items are at or beyond the end of their useful service life. The environmental,
legal, and indirect economic impacts of "doing nothing" are extreme, since these improvements are
required to allow compliance with the Owner's current discharge pennit.
6
VI. Recommendations
OMI recommends that Augusta implement the following improvements as quickly as funding becomes
available and OMI commits to implement with equal vigor whatever program Augusta deerps best suited
for its future needs.
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