HomeMy WebLinkAbout1997-083 CONT AMND #2 - Carollo Engineers AMENDMENT NO. 2
TO
ENGINEERING SERVICES CONTRACT
FOR
PHASE I OF THE WWTP UPGRADE PROJECT
The Engineering Services Contract (Agreement) between the City of Ashland (City) and Carollo
Engineers (Engineer), dated November 5, 1996 for Phase I of the Wastewater Treatment Plant
Upgrade Project is hereby amended as set forth herein.
1.0 - Introduction
The Agreement is attached as Exhibit 1. Final Design Services that the Engineer shall perform
were established in the Agreement under Task 2. Construction Services that the Engineer shall
perform were established in the Agreement under Task 3.
As a result of the Task I - Preliminary Design Services as detailed in the Agreement, the
Engineer has recommended, and the City has accepted, treatment process design and project
phasing changes from those recommended in the Facilities Plan. These changes have been
documented in the amended Facilities Plan and the completed Predesign Report. As a result of
this change in the project approach, the scope of the Engineer's final design services described
under Task 2 and the scope of the construction period services described under Task 3 of the
Agreement are no longer applicable. Any outstanding subtasks under Task I - Preliminary
Design Services shown in Exhibit 1 to the Agreement and any outstanding tasks included in
Amendment No. 1 to the Agreement are unchanged by this Amendment.
The revised project will be undertaken as two separate projects. Project A will consist of the
new facilities at the wastewater treatment plant site and Project 13 will consist of the effluent
storage and irrigation facilities and biosolids processing facilities on the off-site location (City-
owned property). Conveyance pipelines will also be included in Project B. This Amendment is
limited to Final Design Services for Project A and Preliminary Design Services for Project B.
The scope of the engineering services related to final design of Project B and engineering
services during construction will be developed in a subsequent amendment when the scope of
that work is better defined. While these subsequent tasks are not included within this
Amendment, estimated budgets for these tasks are included in Exhibit 2 to this Amendment.
2.0 - Deletions and Amendments
Task 3- Construction Services, as detailed in the Agreement, are deleted by this Amendment. It
is anticipated that Engineering Services during Construction will be included in a subsequent
amendment to the Agreement.
Task 2 - Final Design Services, as detailed in the Agreement, are amended as follows:
2.1 - Task 2 - Project A Final Design Services
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2.1.0 - Project A Elements
The Project A final design includes the following elements:
Headworks
1. Design of the removal of the existing barminutor and replacement with one reciprocating rake
bar screen and one manual screen. Design of a screenings compactor and conveyance of
compacted screenings to a dumpster for hauling off-site. The new equipment will not be
enclosed in a structure.
2. Design of a replacement of the grit collector mechanism and drive with new equipment.
3. Design for covering the existing channels and installing a carbon scrubbing unit to treat foul
air.
Primary Clarifier
1. The primary clarifier will not be needed in the treatment process and will be removed from
service. Design of any piping modifications or demolition which will be necessary to take the
clarifier out of service shall be included.
Aeration Basins
1. The existing aeration basin on the west side of the site will be demolished to allow
construction of the oxidation ditch. The east aeration basin shall be maintained in service
during construction until the 'oxidation ditch is placed in service. Design of piping modifications
and demolition necessary to accomplish this are included.
Oxidation Ditches
1. Two new oxidation ditches using low speed submerged turbine aerators shall be designed as
an alternative to continued use of the existing aeration basins. The oxidation ditches shall be
sized to provide nitrification of wastewater to achieve the wet season discharge limits tentatively
established by DEQ. The oxidation ditches will not be designed for phosphorus removal since
dry season discharge via spray irrigation has been selected by the City.
2. A new flow splitting structure shall be included in the design to allow splitting of flow between
the two ditches.
Secondary Clarifiers
1. The design of one new, 80-ft diameter secondary clarifier. Include a flow splitting structure to
distribute flow between the three clarifiers.
2. The replacement of the sludge collector mechanism and rehabilitation of existing Clarifier No.
1 and rehabilitation of existing Clarifier No. 2.
3. The design of a new Return Activated Sludge pumping station. This shall include demolition
of the existing RAS pumping station and interim construction measures to keep the plant
operable during construction.
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Disinfection
1. Preparation of prepurchase documents for sole source procurement of ultraviolet disinfection
equipment and assistance to the City during the prepurchase process.
2. Design of the installation of the prepurchased disinfection equipment in a channel of the
existing chlorine contact basin.
Effluent Pump Station
1. The design of an effluent pump station for pumping treated wastewater to the off-site storage
and spray irrigation system.
Solids Handling Facilities
1. Provision of a temporary sludge thickening system to allow for continued and improved
sludge processing operations during construction.
2. Design of a waste sludge pump station for pumping waste activated sludge to the off-site
storage lagoons.
Chemical Feed System
1. Design of a chemical storage and feed system for alkalinity control.
Electrical System
1. The design of upgrades to the main power distribution system to accommodate the new
electrical loads associated with the Project elements.
2. Design of a new MCC room and process control room.
3. Design of a stand-by power system.
Instrumentation and SCADA System
1. The design of a instrumentation and SCADA system for plant control. The instrumentation
and SCADA system shall be compatible with the system currently installed at the City's water
treatment plant.
Landscaping and Irrigation
1. The design of landscaping, landscape irrigation system, and site screening as conceptually
developed dudng the preliminary design phase.
Operations Building Remodeling and Additions
1. Design of a remodel and expansion of the existing Operations Building to provide additional
laboratory space, improved operations facilities, and a maintenance area. The process control
center will be moved to a new location next to the MCC room. Maintenance equipment will be
obtained by the City and the specification of such equipment is not included.
Ashland Creek Pump Station Rehabilitation "
1. Design of the upgrade of the electrical power distribution and control systems associated with
this pump station. Replacement of mechanical equipment, structural modifications and changes
to the existing stand-by power system are not anticipated.
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Miscellaneous Plant Improvements
1. The design of an effluent re-aeration system per DEQ requirements.
2. The design of a 3W pump station and 3W piping distribution system.
3. The design of other utilities systems necessary for satisfactory operation of the improved
treatment plant.
2.1.1 UV Equipment Prepurchase
1. To satisfy the DEQ requirement that ultraviolet disinfection be completed as an early action
item, the Engineer will develop prepurchase documents for the City's purchase of medium
pressure ultraviolet disinfection equipment. The installation of the equipment will be the
responsibility of the Project A contractor. The prepurchase bid documents shall include
technical specifications, layout drawings and a P&ID. The Engineer shall evaluate the need for
standby power to the ultraviolet disinfection system on a temporary basis and if necessary,
develop prepurchase bid documents for this equipment.
2. Assist the City with procurement of the prepurchased equipment including review of
equipment supplier submittals. Based upon the review, make a recommendation to the City
regarding satisfactory compliance with the bidding requirements.
2.1.2 Prepare Final Design Drawings
Final design drawings shall be prepared in sufficient detail to allow competitive bidding and
successful construction of the project. A list of anticipated design drawings and the budget
hours for each drawing are included as Exhibit 3 to this amendment.
The design shall also include specific provisions for bypassing flows around structures to allow
work within an existing structure to take place. Engineer shall provide descriptions of temporary
facilities that the contractor must provide to allow the treatment plant to remain in good working
condition while modifications to existing facilities are underway.
Design drawings shall be provided to the City and DEQ for review and comment at the 50% and
90% completion stages. Review comments will be incorporated into the drawings.
2.1.3 Prepare Project Specifications
Engineer shall prepare specifications for the project using EJCDC "front end" specifications with
Supplementary Conditions developed specifically for this project. Technical specifications shall
be in CSI format. The project specifications shall be submitted to the City and DEQ for review
along with the design drawings at the 50% and 90% design stages. Review comments shall be
incorporated into the specifications. .
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2.1.4 Design Review Workshops
Engineer shall conduct an kickoff workshop and design review workshops with the City staff
during the course of preparing the final design drawings. Four workshops are anticipated with
design review workshops occurring at the 25%, 50%, and 90% design stages. All workshops
will be held at the City.
2.1.5 Design Progress Meetings
Engineer shall meet with City staff monthly to discuss work progress, information needs, and
design issues. In addition to the monthly meetings it is anticipated that there will be design focus
meetings with City staff to discuss operations and design issues.
2.1.6 Quality Control Reviews
Engineer shall conduct an internal Quality Control review check at the 50 percent design stage.
This review will focus on the technical aspects of the design, coordination between the new
facilities and the existing facilities and constructability of the new facilities.
A second Quality Control review shall be conducted at the 90 percent complete design stage.
2.1.7 Prepare Final Engineer's Cost Estimate
The preliminary cost estimate shall be updated based upon the final design of the new facilities.
This estimate shall be completed at the 90% complete design stage.
2.1.8 Prepare DEQ Submittals
Engineer shall continue coordination with DEQ during the final design of the project. Engineer
shall periodically advise the Department of project status and regulatory interfaces will be
specifically addressed. DEQ will be invited to the progress meetings and will be provided with
progress submittals of the Drawings and Specifications at the 50% and 90% design completion
points.
Task 2.2 - Project B Predesign Services
Engineer shall complete the predesign effort for the off-site facilities by evaluating conveyance
pipeline routings, alternate storage locations, irrigation system options, access road alignment
possibilities, lagoon supernatant disposal requirements, TID canal crossing options and
electrical power source availability. In addition, Engineer shall investigate site-specific regulatory
requirements for spray irrigation and biosolids utilization, site-specific zoning requirements and
environmental mitigations.
Engineer shall provide subconsultant expertise as needed for SUrveying and additional
geotechnical investigation relative to the predesign of the off-site facilities. Geotechnical issues
addressed during predesign are expected to include rock excavation and import of suitable
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embankment fill material versus on-site production of well graded material.
Conveyance pipelines will require right-of-way and easement acquisition. Engineer shall
investigate these needs and assist the City is acquisition of needed easements and rights-of-
way. Engineer shall coordinate the preliminary design of conveyance pipelines routing
alternatives with requirements of Oregon Department of Transportation (highway crossing),
Talent Irrigation District (irrigation canal crossing) and Jackson County Road Department (Bear
Creek Crossing using existing bridge).
The Engineer shall submit a draft predesign report for City review. The report shall be finalized
in response to City comments.
3.0 - Milestone Completion Dates
A schedule for the services to be performed is shown in Exhibit 4. Specific milestone
completion dates are:
Project A
Submit UV disinfection prepurchase documents
Submit 90% complete design documents
Submit 100% complete design documents
Project A operational
September 30, 1997
April 30, 1998
September 4, 1998
August 30, 2000
Project B
Submit draft Predesign Report
Submit Final Predesign Report
September 30, 1997
November 1. 1997
4.0 - Deliverables
The Engineer shall prepare and submit to the City the following work products related to the
tasks included in this Amendment:
1. Meeting Notes
2. Monthly Progress Reports
3. Kickoff Workshop and Design Review Workshops
Prepurchase documents for the UV disinfection equipment. Includes standby generator
prepurchase documents, if required.
Recommendation to City regarding UV equipment prepurchase.
Draft Preliminary Design Report for Project B.
7. Final Preliminary Design Report for Project B.
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9.
10.
11.
5 sets of 50% complete and 90% complete Drawings and Specifications for City review.
20 copies of final bid documents.
One full set of mylar reproducible drawings.
Engineer's estimate of Construction Cost at 50% and at project completion.
5.0 - Compensation
This amendment increases the authorized contract amount from $836,849 to $1,355,934.
Compensation for the tasks included in this Amendment is based upon the estimate of labor
hours and the estimate of the cost of services as shown in Exhibit 3. Compensation to the
Engineer for the services included in this Amendment shall be paid on the following basis:
Task 2.1 - Project A Final Design Services. Compensation for Engineer's services as
identified within this Amendment for Final Design of Project A shall be on a lump sum basis.
Compensation for labor, direct costs, and subconsultant fees shall not exceed a lump sum of
$1,103,000. Monthly invoices will be submitted based on Engineer's estimate of the percentage
of completion for Task 2. Percentage of completion shall be calculated for each individual
subtask to arrive at a percentage of completion for Task 2.1 as a whole.
The City will retain 10 percent of the invoiced amount. Retained monies will be released to the
Engineer upon final acceptance of the completed bid documents by the City.
Task 2.2 - Project B Predesign Services. Compensation for Engineer's services as identified
within this Amendment for Predesign of Project B shall be on a basis of the Engineer's direct
labor rate times a multiplier of 3.15 for each hour of labor spent undertaking the work plus direct
costs. Subconsultants shall be invoiced at the Engineer's cost plus ten (10) percent. All other
direct costs will be invoiced at the actual cost.
Total compensation for labor, direct costs and subconsultant fees associated with Task 2.2 shall
not exceed a limit of $60,000.
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This Amendment No. 2 to the Engineering Services Contract between the parties listed below is
accepted as of the __ day of ,1997.
CAROLLO ENGINEERS
CITY OF ASHLAND
REVIEWED AS TO (~.0~T-~-NT
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