HomeMy WebLinkAboutRH2 Engineering, Inc. - West Pasco WTP Improvements Amendment No. 2 Agreement No. 0-021 Project 16008AMENDMENT NUMBER 2 to
PROFESSIONAL SERVICES AGREEMENT
16008 — West Pasco Water Treatment Plant Improvements
AGREEMENT NO. 20-021
WHEREAS, the City and RH2 Engineering, Inc. entered into a Professional Services
Agreement on 7/14/2020 to provide engineering services with respect to the West Pasco Water
Treatment Plant Improvements Project.
WHEREAS, the City and the RH2 Engineering, Inc. entered into the first amendment to
the Professional Services Agreement No. 20-021 on December 21, 2020; and
WHEREAS, all parties to this agreement agree that this second amendment will not
modify or change any other terms (including any references to terms and conditions that are in
conflict) of the professional services agreement (Agreement No. 20-021) not covered by this
Addendum, which is attached.
NOW, THEREFORE, this agreement is amended to allow R112 Engineering, Inc. to
modify their original scope of work for professional and design engineering services as described
within Exhibit A.
Sco a of Work:
See Exhibit A.
2. Fee:
No Change. The compensation for this amendment is based on a Time and Materials
Basis and remains limited to $665,649.00.
3. Time of performance:
No Change. The services shall be complete for the project on or before 12/31/2021.
DATED THIS 1 DAY OF , 2021.
CITY OF PASCO: CONSULTANT
City of Pasco
Steve Worley, Public Works
RH2 Engineering, Inc.
Paul Cross, PE — Project Manager
Amendment No. 2 to Professional Services Agreement Page 1
RH2 Engineering, Inc.
16008 — West Pasco Water Treatment Plant Improvements
EXHIBIT A
Scope of Work
Amendment No. 2
City of Pasco
West Pasco Water Treatment Plant Improvements
12 MGD Expansion Phase 1
Design and Permitting
May 2021
This scope of work Amendment No. 2 updates the original June 2020 scope of work to reflect the
12 MGD expansion Phase 1 improvements. When the original June 2020 scope of work was
conceptualized, the overall extent of design was unknown. As the preliminary design technical
memorandum was developed, a more realistic project breadth was identified, and the City decided
to break the 12 MGD expansion into four phases to take advantage of yearly funding opportunities.
• Phase 1 will expand the WPWTP treatment capacity from 6 MGD to 12 MGD. This phase
will include the addition of two pre -filtration strainers, two 3 -MGD membrane racks, a
strainer and membrane rack residuals recovery system, and other in -plant improvements.
Future phases of this project include the following:
• Phase 2 will provide additional pumping capacity and power redundancy. This phase will
add one IPS pump, two 3 -MGD Zone 3 pumps, convert the existing backup WPWTP power
generator to be dedicated to power the IPD, and add a 2 -megawatt generator dedicated to
power the WPWTP and future expansion.
Phase 3 will provide additional pumping redundancy. This phase will add one IPS pump and
one 6 -MGD Zone 3 pump.
Phase 4 will expand the IPS and WPWTP to full 18 MGD build -out. This phase will add one
IPS pump, add two 3 -MGD membrane racks, provide redundancy for the strainer and
membrane rack residuals recovery system, add two Zone 1 pumps, and add one 6 -MGD
Zone 3 pump.
Background
The City of Pasco (City) is growing rapidly, and its potable water demands are increasing with
population growth and local industries. The City has two water treatment plants on opposite ends of
its distribution system. While these plants can accommodate current and short-term peak demands
together, individual plant capacity must increase to meet the City's 20 -year planning projection. The
West Pasco Water Treatment Plant (WPWTP) was designed to accommodate equipment expansion
within the facility, and this is a cost-effective way for the City to handle growth.
City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
Raw water is pumped to the West Pasco Water Treatment Plant from the Columbia River Intake
Pump Station (IPS). The IPS has the capability to handle current and future expansion; however, the
IPS is currently equipped to supply a total capacity of 6 million gallons per day (MGD). Atthe WPWTP,
the raw water is pre -chlorinated and fed a coagulant prior to passing through two pre -filtration
strainers. The pre-treated water is then filtered using two parallel membrane module systems, each
with a capacity of 3 MGD, for a total capacity of 6 MGD currently. Filtered water is chlorinated again
and sent to a clear well to meet chlorine contact time (CT) requirements and provide storage ahead
of the high service pump station to the distribution system.
Filter backwash is sent to two sloped decant ponds that have difficulties handling all the process
water. Currently, settled backwash water and all other waste streams are sent to the City's
wastewater treatment facility for handling.
The City plans to expand plant capacity in increments, first to 12 MGD in 3 phases, and then
eventually to 18 MGD. The existing treatment plant facility has a large footprint and open floor plan
to accommodate additional equipment. However, careful consideration should be given to evaluate
the existing equipment and proposed retrofit modifications to reduce plant downtime and align the
improvements with the City's other projects and overall budget.
The City proceeded with a consultant selection process to design and implement modifications to
the WPWTP. RH2 Engineering, Inc., (RH2) was selected to provide the professional engineering
services to complete the preliminary and final design for the proposed improvements.
This Scope of Work presents the design and permitting tasks for this project as follows:
• Task 1— Preliminary Design
• Task 2 — Final Design
• Task 3 — Permitting
• Task 4— Project Administration and Management
A scope of work and fee estimate for the following tasks will be developed once design has been
completed.
• Task 5 — Services During Bidding
• Task 6 — Services During Construction
• Task 7 — SCADA Software Development
Approach
Task 1— Preliminary Design
Objective: Prepare a technical memorandum summarizing the WPWTP improvements, design
criteria, and initial equipment selections. Prepare a project report for Washington State Department
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
of Health (DOH) submittal based on applicable Washington Administrative Code (WAC) requirements
for the WPWTP improvements.
Approach:
1.1 Perform a Limited Condition Assessment: Perform a technical site visit. Document known
deficiencies. Investigate electrical, structural, process, mechanical, heating, ventilation, and air
conditioning (HVAC) equipment, and supervisory control and data acquisition (SCADA)
instrumentation. Review and summarize existing WPWTP process data provided by the City.
Coordinate with the membrane system manufacturer to visit the site and assess the status of
the existing membrane systems and determine requirements for the expansion.
1.2 Perform Hydraulic Analyses and Pump Selection: Develop system head curves and perform
preliminary Zone 3 High Service Booster Pump Station (BPS) pump sizing and selection for two
Zone 3 pumping alternatives: 1) two pump configuration; or 2) three pump configuration. Each
pumping alternative will be reviewed with up to three (3) Zone 3 transmission main and storage
alternatives. An evaluation of a detached, standalone BPS also will be considered. Review
original mechanical design intent for the intake facility, create projected system head curve(s)
for the raw water supply facility, and identify new pumping equipment improvements
necessary for the proposed WPWTP expansion.
1.3 Perform Mechanical and Process Analyses: Review mechanical systems and develop a list of
improvements, including but not limited to, raw -water -to -waste, membrane expansion,
mechanical strainers, filter backwash systems, chemical storage and feed capacity, access, and
piping, filter -to -waste piping addition, HVAC upgrades, structural appurtenances for moving
equipment (i.e. gantry, bridge cranes) and improving access, noise mitigation appurtenances,
valve and actuator replacements, permanent waste and drain piping improvements, and
chlorine contact time tank improvements. Coordinate with and obtain preliminary proposal
from membrane filter skid manufacturer regarding expansion and integration into the existing
filter system and support systems such as blowers and Clean -in-place (CIP). Review existing High
Service BPS pump suction and discharge piping alternatives and identify improvements to
reduce cavitation and comply with Hydraulic Institute standards, including consideration for a
standalone BPS. Develop costs for the mechanical system improvements along with a short
narrative regarding the benefit they will provide, such as increased safety, reduced
maintenance, automation, etc.
1.4 Perform Residuals Handliniz Analyses: Review existing filter backwash process and quantities
discharged, estimate increased quantities based on expansion and modifications, and develop
residuals handling alternatives. Identify and detail mechanical processes for separating the
backwash water flow continuously at a high rate separation process into a clarified liquid stream
and a concentrated waste stream, such as plate settling or dissolved air flotation. This may
include modifying the existing settling basins to serve as equalization basins to lower the
continuous process flow rate. Pre-treatment process alternatives such as turbidity reduction,
chlorine residual removal, and coagulation addition will be considered. The clarified water
waste stream disposal options to be evaluated include: 1) send to irrigation; 2) recycle to
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
WPWTP raw water; 3) treat to drinking water standards; 4) discharge to the river; and 5) any
combination of these. Additional clarified water post-treatment processes will be evaluated
based on the estimated water quality and preferred clarified water discharge location. Residual
solids processing and disposal will be reviewed. Determine the equipment units and process
methods required for each process alternative and develop a weighted decision matrix to
provide a recommendation.
1.5 Perform Electrical and Control System Analyses: Review as -built drawings and information
collected from the technical site visit in subtask 1.1 to develop electrical load calculations for
the WPWTP and Intake Pump Station. Determine the electrical distribution system modification
requirements required to integrate the proposed mechanical and process equipment into the
existing electrical distribution system. Perform generator sizing calculations to determine the
appropriately sized generator for providing standby power at both the WPWTP and Intake
Pump Station. Identify alternatives for supplying backup power to the proposed equipment.
Alternatives at the WPWTP shall include reuse of the existing standby generator while load
shedding to only operate critical equipment and systems, adding a second standby generator
operating in parallel with the existing generator, and replacing the existing generator in its
entirety with a larger generator. Alternatives at the Intake Pump Station shall include supplying
standby power to the new pumps from the WPWTP standby generator either through medium
voltage or low voltage distribution. The alternatives analysis shall include a review of the
existing fuel storage system and whether additional fuel storage will be required. The use of a
load bank also shall be evaluated to prevent wet stacking. Additionally, the automatic transfer
switch shall be evaluated to determine if replacement is required. Evaluate the existing control
system hardware and software to identify the necessary improvements to the control system
to operate the WPWTP after the proposed improvements are constructed and to replace
obsolete components needing replacement. Prepare a phasing strategy for performing both the
electrical and control system improvements with as little downtime as possible.
1.6 Prepare Technical Memorandum: Prepare a technical memorandum describing the proposed
WPWTP improvements, design criteria, and initial equipment selections. Perform internal
quality assurance and quality control (QA/QC) review and submit the technical memorandum
to the City for review and comment. Prepare meeting agenda and attend one (1) meeting with
the City to review and discuss the City's comments on the technical memorandum and WPWTP
improvements. Prepare meeting minutes.
1.7 Coordinate with DOH and Prepare Draft Project Report: Coordinate with DOH regarding its
expectations for documenting the proposed WPWTP expansion and implementing the
improvements. Prepare a draft Project Report describing the proposed WPWTP improvements,
related design considerations, and construction phasing implementation. The project report
will document the project background and objectives, hydraulic analyses, mechanical retrofit
improvements, residuals handling processes, electrical power improvements, and telemetry
and SCADA upgrades. Perform internal QA/QC review and submit the Project Report to the City
for review and comment. Prepare meeting agenda and attend one (1) meeting with the City to
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
review and discuss DOH's initial feedback, the City's comments on the draft Project Report, and
WPWTP improvements. Prepare meeting minutes.
Assumptions:
• The City will provide access to the hard copy data, plans, manuals, etc. required for this
project. RH2 will collect the information and make appropriate copies as needed and return
them to the City.
• RH2 possesses the City's current hydraulic water system model which is up to date with al/
system improvements and has been calibrated to industry standard. RH2 will perform
hydraulic modeling of steady-state conditions only for pump sizing and selection; surge or
transient analyses will be performed by the City separately from this contract.
• RH2 will rely on the accuracy and completeness of information, data, and materials generated
or provided by the City or others in relation to this Scope of Work.
• All deliverables will be provided in electronic (PDF) format unless otherwise noted. Hard copies
of plans, where provided, will be in half-size (11 -inch by 17 -inch) format, unless otherwise
noted.
Provided by City:
• Access to WPWTP during site visit.
• The latest twelve (12) months of existing WPWTP process data.
• Identification of Zone 3 transmission main and storage alternatives for consideration with
proposed Zone 3 High Service BPS pumping needs.
• Attendance at technical memorandum review meeting.
• Written review comments on technical memorandum.
• Attendance at draft Project Report review meeting.
• Written review comments on draft Project Report.
RH2 Deliverables:
• Site visit to review existing infrastructure.
• Technical memorandum.
• Attendance at technical memorandum meeting.
• Technical memorandum meeting agenda and minutes.
• Draft Project Report.
• Attendance at draft Project Report meeting.
• Project report meeting agenda and minutes.
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
Task 2 — Final Design
Objective: Prepare plan and specification documents required for a complete set of bid documents.
Provide conceptual plans to the City at the 30 -percent milestone for review and feedback. Provide
plans, specifications, and cost estimate at the 60 -percent milestone for review and feedback. Provide
plans, specifications, and cost estimate at the 90 -percent milestone for review and feedback. Finalize
documents for bidding.
Approach:
2.1 Prepare General Plans: Prepare the cover sheet, general information drawings, and phasing
plan drawing(s).
2.2 Prepare Site/Civil Design and Perform Geotechnical Investigation: Prepare site/civil plan
drawings showing existing site and facility layouts, temporary erosion control and construction
measures and layouts, site grading improvements, proposed facility layouts, surface
improvements, and utility improvements. Investigate geological site conditions for design and
construction of the proposed facilities. This will consist of up to four (4) exploratory test pits —
three (3) at the residuals handling process location and one (1) at the high service pump station
location. Coordinate with City staff to provide backhoe and operator. Attend excavation and
backfill of excavated soil and collect representative samples for evaluation of soil characteristics
and analysis by a geotechnical laboratory. Prepare an Engineering Geology and Geotechnical
Report summarizing the findings of the existing data review and field investigations and provide
recommendations for the proposed structures and utilities design.
2.3 Prepare Mechanical Design: Prepare process and mechanical drawings showing demolition of
existing piping and equipment and proposed pipe routing and equipment installation. Size
piping and size and select equipment. Prepare minor mechanical design. Prepare HVAC design.
2.4 Prepare Structural Design: Prepare structural design and details for the proposed backwash
residuals handling processes and ancillary supports and structures. Perform site visit to observe
the condition of the existing structures and design structural retrofits.
2.5 Prepare Electrical and Telemetry Design: Prepare electrical, instrumentation, and control
design, including electrical distribution design, process and instrumentation control, and
telemetry systems to interface with the City's existing system.
2.6 Prepare Construction Phasing Plan: Prepare a phasing plan for the construction of the planned
system improvements to maintain operation of the WPWTP throughout construction. Identify
periods when construction can occur, when unit processes of the WPWTP would need to be
shut down, and how the treatment plant can maintain operation during construction.
2.7 Submit 30 -Percent Conceptual Design Documents to City: Submit the 30 -percent design plans
to the City. Prepare meeting agenda and attend one (1) meeting with the City to discuss
30 -percent review comments. Prepare meeting minutes.
2.8 Prepare Specifications: Develop non-technical (front-end) and technical specifications. Provide
the advertisement to bidders, instructions to bidders, general conditions, construction contract,
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
insurance provisions, and other typical forms used for the bidding and engagement of public
works contracts. Prepare Division 1(general) through Division 18 (measurement and payment)
of the technical specifications. It is assumed that the front-end documents will be based on the
City -provided bid forms and contract documents and modified by RH2. It is assumed that RH2
will use its modified Construction Specification institute (CSI) specifications for the technical
portion of the specifications.
2.9 Prepare Engineer's Opinion of Probable Construction Cost: Prepare engineer's opinion of
probable construction cost (OPCC) based on 60- and 90 -percent design documents.
2.10 Submit 60 -Percent Design Documents to City: Submit the 60 -percent design plans,
specifications, and OPCC to the City. Prepare meeting agenda and attend one (1) meeting with
the City to discuss 60 -percent review comments. Prepare meeting minutes.
2.11 Submit 90 -Percent Design Documents to City: Submit the 90 -percent design plans,
specifications, and OPCC to the City. Prepare meeting agenda and attend one (1) meeting with
the City to discuss 90 -percent review comments. Prepare meeting minutes.
2.12 Perform Internal QA/QC: Perform internal QA/QC review of the 90 -percent design plans and
specifications.
2,13 Prenare Bid -Ready Design Documents: Incorporate final comments and permitting conditions
into the plans and specifications. Prepare bid -ready plans and specifications and final OPCC.
Assumptions:
WPTWP Mechanical improvements — Design assumes identical Pall Water membrane racks,
additional strainers and access, minor chemical systems access and piping improvements,
filter to waste piping, and minor HVAC systems upgrades.
Process Residuals Handling — Design includes minor modifications to the existing basins,
addition of one (1) mechanical process for better clarification of the process residuals water,
and the design of improvements for discharge to raw water system for recycling.
Provided by City:
• City bid forms and contract documents in MS Word format.
• Attendance at the 30-, 60-, and 90 -percent design review meetings.
• Written review comments on the 30-, 60-, and 90 -percent design documents.
• Input regarding WPWTP shutdowns and construction phasing.
RH2 Deliverables:
• Engineering Geology and Geotechnical Report.
• 30 -percent design plans.
• 60 -percent design plans, specifications, and OPCC estimate.
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
• 90 -percent design plans, specifications, and OPCC estimate.
• Attendance at 30-, 60-, and 90 -percent design review meetings.
• 30-, 60-, and 90 -percent design review meeting agenda and minutes.
• Bid -ready plans, specifications, and OPCC estimate.
Task 3 — Permitting
Objective: Assist the City in obtaining permits to address environmental, site, building code, and DOH
requirements. The following information represents RH2's current understanding regarding the type
and level of effort that will be required to permit this project for construction. The following
permitting requirements are expected:
• DOH Project Report.
• DOH Construction Documents Review.
• City of Pasco State Environmental Policy Act (SEPA) Compliance.
• City of Pasco Site Development Permit.
• City of Pasco Building Permit.
Permitting and agency coordination is subjective and determining level of effort at this early stage is
difficult. Due to the difficulty in predicting RH2's level of effort coordinating with agencies in this
Task, additional authorization may be needed if RH2's involvement exceeds the hours currently
allocated in Exhibit B. Fee Estimate.
Approach:
3.1 Submit Project Report to DOH: Prepare application and submit the final Project Report to DOH.
Compose a letter responding to review comments from DOH, if necessary.
3.2 Submit Construction Documents to DOH: Prepare application and submit the finalized
construction documents to DOH. Compose a letter responding to review comments from DOH,
if necessary.
3.3 Pre[)are SEPA Submittal: Coordinate with Planning staff regarding SEPA requirements,
submittal, etc. Attend a Pre -Application Meeting with City Planning and project staff to discuss
the project, if needed. Prepare a draft SEPA Checklist for City staff review. Finalize the SEPA
Checklist based on City staff comments, and provide to the City Planning staff for review,
publication, and decision components.
3.4 Pren are City Site Development Submittal: Prepare the application for the Site Development
Permit submittal based on the 90 -percent design stage.
3.5 Prepare Cit,,, Building Permit Submittal: Prepare the application for the Building Permit
submittal based on the 90 -percent design stage. Develop energy code calculations. Prepare and
submit the structural calculations performed in the previous tasks for Building Permit submittal.
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
3.6 Provide Other Permitting Coordination with the City: Provide up to twenty (20) hours of support
time to the City during preparation of other required permits. Provide up to four (4) sets of
design documents to the City for permitting applications.
Assumptions:
• It is assumed that there will be only one (1) round of review comments from DOH for each
submittal.
• Acceptance of permit submittals is beyond the control of RH2 and the City, and no date is
warranted or implied for DOH response or acceptance.
• It is assumed no Washington State Department of Ecology permitting or National Pollutant
Discharge Elimination System (NPDES) permit are necessary.
• Impacts to critical areas will be avoided. As such, this Scope of Work does not include
development of mitigation plans. Should it be necessary, mitigation measures will be included
in a mutually agreed upon amendment to this Scope of Work.
• No federal permitting, federal biological assessments or evaluations, or U.S. Army Corps of
Engineers permitting, or jurisdiction coordination will be involved.
• No tribal coordination or facilitation will be needed or conducted.
• The City will pay all permit fees and obtain any needed right-of-way permits.
Provided by City:
• Payment of all permit application fees
RH2 Deliverables:
• Two (2) hard copies and one (1) electronic copy of the final Project Report for DOH submittal.
• Two (2) hard copies and one (1) electronic copy of the final construction documents for DOH
submittal.
• Letter response to DOH comments, if needed.
• Applications for DOH Project Report and construction document review submittals.
• Preparation of application for and attendance at a Pre -Application Meeting with City Planning
staff, if needed.
• Four (4) hard copies, one (1) PDF, and one (1) Word file of SEPA documentation, including
duplicates for the City.
• Four (4) hard copies, one (1) PDF, and one (1) Word file of Site Development Permit submittal
packages, including duplicates for the City.
• Four (4) hard copies, one (1) PDF, and one (1) Word file of Building Permit submittal packages,
including duplicates for the City.
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City of Pasco Amendment No. 2
West Pasco Water Treatment Plant 12 MGD Expansion Phase 1 Exhibit A
Design and Permitting Scope of Work
Task 4 — Project Administration and Management
Objective: Administer, manage, and monitor the RI -12 project team, resources, communications,
scope progress, budget, files, and records.
Approach:
4.1 Review and monitor project progress/schedule, scope, and budget.
4.2 Manage the RI -12 project team and resources.
4.3 Provide monthly invoices with progress report documenting work performed and budget
status.
4.4 Communicate with the City regarding project progress, invoicing, and schedule.
4.5 Maintain project files and records in electronic format.
RH2 Deliverables:
• Schedule, scope, and budget administration and management.
• Project team and resource management.
• Monthly invoices with progress reporting.
• Communication with City.
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