HomeMy WebLinkAboutRH2 Engineering, Inc. - NW Irrigation System Study Amendment No. 1 (#21-012) - ExecutedAMENDMENT NUMBER 1 to
PROFESSIONAL SERVICES AGREEMENT
Northwest Irrigation System Study
AGREEMENT NO. 21-012
WHEREAS, the City and RH2 Engineering, Inc., entered into a Professional Services
Agreement on March 8, 2021 to provide engineering services with regard to the Northwest
Irrigation System Study project.
WHEREAS, additional work is needed to continue the study and develop further the
future irrigation system in the northwest part of the city.
WHEREAS, the City and RH2 Engineering has agreed to the attached scope of work and
additional fee associated with this work.
WHEREAS, all parties agree this addendum will not modify or change any other terms
of the Professional Services Agreement No. 21-012.
NOW, THEREFORE, this agreement is amended as follows:
1. Scone of Work:
See Exhibit A.
2. Fee:
The compensation for this amendment is on a Time and Materials Basis not to
exceed $88,031.00 for a total contract amount of $138,031. 00. Refer to
Exhibit B for the breakdown of hours.
3. Time of performance:
No Change. The services shall be complete for the project on or before 12/31/2021.
DATED THIS
CITY OF PASCO:
DAY OF J an C, , 2021.
City of Pasco
Dave Zabell — City Manager
Amendment No. 1 to Professional Services Agreement
RH2 Engineering, Inc.
NW Irrigation System Study
CONSULTANT
. 017,VS91
RH2 Engineering, Inc.
Paul Cross, P.E.
Page 1
Scope of Work
Amendment No. 1
City of Pasco
Northwest Irrigation System Study — Phase 2
June 2021
Background
EXHIBIT A
The City of Pasco (City) is planning for water, sewer, and irrigation system expansion to meet
concurrency requirements of the Growth Management Act for the expanded Urban Growth Area
(UGA) boundaries proposed by the City's 2018-2038 Comprehensive Plan for land use. The City's
Community and Economic Development Department (CED) anticipates that a significant amount of
the 20 -year growth will occur in the northwest planning areas that currently are not served by City
utilities.
The City has asked RH2 Engineering, Inc., (111-12) to prepare the Northwest Irrigation System Study to
build upon other recent studies prepared by RI -12 for the City for both sewer in the Addendum to the
Comprehensive Sewer Plan (in progress) and irrigation in the Irrigation System Capacity Analysis
(2018) and Future Irrigation System Supply (2019) reports. The goal of this study is to develop a
preliminary layout of a trunkline irrigation system with proposed pressure zones and to consider the
source of supply coming directly or indirectly from the Columbia River, groundwater supplies, the
South Columbia Basin Irrigation District (SCBID), or some combination thereof based upon the
advantages and disadvantages of each alternative.
The first phase of the project is complete. In this second phase, the City would like RI -12 to complete
the following tasks.
Task 4 — Irrigation System Preliminary Design
Objective: Assist the City and SCBID in developing a more detailed preliminary (30 percent) design
of a Municipal and Industrial (M&I) pump station, distribution system, and phasing plan for obtaining
irrigation water from SCBID.
Approach:
4.1 Meet with SCBID to assess proposed location(s) for a new M&I pump station where the
flexibility of supplies best accommodates existing supplies, treated water supplies, and future
irrigation supplies and demands. SCBID will determine and identify how much water is available
as agricultural lands within the City's UGA are converted to other uses and what rates and
durations of irrigation water treated by aquatic herbicides must be captured and pumped into
the City system to avoid discharge to the Columbia River. SCBID will identify maximum allowable
and minimum required flow rates for the M&I pump station to be used for the City's design
purposes. Meeting will take place at SCBID offices.
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City of Pasco
Northwest Irrigation System Study — Phase 2
Amendment No. 1
Exhibit A — Scope of Work
4.2 Use existing City LiDAR to create 2 -foot contours for preliminary design of a new M&I pump
station site. Survey control and 1 -foot contours will be needed for 60 -percent plan and profile
design.
4.3 Perform a preliminary geotechnical engineering analysis and provide International Building
Code (IBC) seismic design parameters in a geotechnical memorandum. Depending upon the
pump station preliminary design, additional geotechnical investigations may be necessary for
the 60 -percent design.
4.4 Coordinate with a cultural subconsultant to prepare a cultural resources report consistent with
Washington State Department of Archaeology and Historic Preservation guidelines. Document
and record archaeological and/or historic sites per Executive Order 21-03. Field work by a
cultural subconsultant likely will be required in the next phase of the project but is not included
in this Scope of Work.
4.5 Perform hydraulic analyses to determine the system head curve and proposed pump
configuration recommendations to reliably pump the range of flows into the irrigation system
without spill or backup into the SCBID system. Coordinate preliminary pump selections with
vendor.
4.6 Prepare a preliminary 3D model with plan and sections of the structural intake of sufficient
detail to determine intake sizes and working space, and to identify unique construction issues.
It is assumed one (1) plan sheet will be prepared.
4.7 Prepare a preliminary 3D design of the mechanical and electrical equipment, site, and utilities
in sufficient detail to determine the size of the site plan and construction limits. It is assumed
five (5) plan sheets will be prepared.
4.8 Prepare preliminary electrical site plan, flow measurement, and control schematic. It is
assumed three (3) plan sheets will be prepared. Measurement and control schematic will
identify how M&I contract water will be measured and delivered and how treated water
accommodations will be made to avoid returning treated water to the Columbia River.
4.9 Prepare pipeline plans from Dent Road along Iris Lane to the required connections in the
existing City irrigation system showing preliminary alignment and delivery locations at a 1 -inch
equals 100 feet scale drawings. Pipeline profiles are not part of the 30 -percent design. It is
assumed ten (10) plan sheets will be prepared. City will provide record drawings of irrigation
system terminus locations along Broadmoor Avenue for points of connection. SCBID will
provide record drawings of existing turnout locations and connection details at Dent Road and
along Iris Road.
4.10 Prepare a technical memorandum documenting the design criteria, applicable building codes,
design codes, hydraulic model analysis, system head curve, and pump selections, with a
summary of data that needs to be gathered and verified in later stages of the design.
4.11 Develop a preliminary schedule for remaining design tasks and a preliminary design cost
estimate.
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City of Pasco
Northwest Irrigation System Study — Phase 2
Amendment No. 1
Exhibit A — Scope of Work
4.12 Perform internal quality assurance and quality control (QA/QC) review of the technical
memorandum and preliminary design drawings. Submit technical memorandum and
preliminary design drawings to City.
4.13 Review preliminary layouts with City staff, SCBID, and affected developers. Provide meeting
agendas and minutes in electronic PDF format. Two (2) virtual meetings are assumed.
4.14 Revise preliminary design to reflect comments from the City and SCBID and prepare
30 -percent drawings.
4.15 Review 30 -percent design, schedule, and cost estimate with the City and SCBID. One (1) virtual
meeting is assumed. Provide agenda and minutes in electronic PDF format.
Assumptions:
• RH2 has no control over the response and acceptance of any proposals made to SCBID or the
US Bureau of Reclamation for obtaining irrigation water through M&I contracts. Itis assumed
that SCBID will coordinate directly with the US Bureau of Reclamation to communicate the
requests and recommendations of the City.
• The City's existing irrigation model currently maintained by RH2 is the City's most current
irrigation model, and will be used in these analyses.
Provided by City:
• Attendance at meetings with RH2 and SCBID.
• Broadmoor Avenue irrigation main record drawings.
• Comments on preliminary layouts and technical memoranda.
RH2 Deliverables:
• Attendance at meetings with City and SCBID; meeting agendas and minutes in electronic PDF
format.
• One (1) geotechnical memorandum in electronic PDF format.
• Coordination with cultural subconsultant.
• One (1) design criteria and preliminary design summary technical memorandum in electronic
PDF format.
• One (1) preliminary 3D model of the structural intake in electronic PDF format.
• Five (5) preliminary 3D designs of the mechanical and electrical equipment in electronic PDF
format.
• Three (3) preliminary electrical site plans, flow measurement, and control schematic in
electronic PDF format.
• Ten (10) preliminary pipeline plans in electronic PDF format.
• 30 -percent design, schedule, and cost estimate in electronic PDF format.
3
City of Pasco Amendment No. 1
Northwest Irrigation System Study — Phase 2 Exhibit A — Scope of Work
Task 5 — Interim Irrigation Operations Plan
Objective: Assist the City and developers in the Broadmoor area with developing a more detailed
phasing plan for obtaining irrigation water from SCBID prior to the full development of the City
irrigation distribution system and M&I pump station.
Approach:
5.1 Meet with developers and City staff to share preliminary designs, costs, and schedule. Review
and identify developer options for interim irrigation water supplies and development
schedules. Provide agenda and minutes in electronic PDF format. Meeting is assumed to be
virtual.
5.2 Assess how the proposed developer -designed irrigation systems align with the proposed City
irrigation system and where the points of connection will be. Determine if City or developer
mains can be adjusted in location and size for mutual benefit. Estimate the oversize or extension
costs and who benefits from the change and document the estimated costs via email or via
meeting minutes to the City.
5.3 Identify how the 30 -percent design schedule and development schedules align with the
opportunities to add existing private systems with M&I contracts to the overall City irrigation
system. Prepare a phased plan for getting properly sized irrigation mains installed within new
roadways or easements as utility improvements are made to new developments.
5.4 Prepare a tabular capital improvement plan for the City to construct the M&I pump station and
install the critical connections to the existing City system necessary for delivering near-term
irrigation demands and treated irrigation water supplies when discharge to the Columbia River
is prohibited. Provide a phasing plan to provide additional supplies from the SCBID irrigation
system as additional agricultural land goes out of production within the UGA. Provide additional
phasing necessary to extend the City irrigation system to additional developments as they
occur. Present the capital improvement plan in figure(s) as needed to document the
recommended improvements and phasing plan.
5.5 Provide the City with up to three (3) alternatives for funding the project including, but not
limited to: 1) developer funded with latecomers agreements; 2) City funded with assessment
reimbursement latecomers agreements; or 3) through formation of a utility local improvement
district.
5.6 Meet with the City to present and discuss the findings within Task 5. Provide agenda and
minutes in electronic PDF format.
Provided by City:
• Attendance at meetings with RH2 and developers.
RH2 Deliverables:
• Attendance at meetings with the City and developers.
4
City of Pasco
Northwest Irrigation System Study — Phase 2
Amendment No. 1
Exhibit A — Scope of Work
• Oversizing and irrigation extension estimates in electronic PDF format via email or within
meeting minutes.
• Meeting agendas and minutes in electronic PDF format.
• Capital improvement plan table(s) and figure(s) in electronic PDF format.
• Three (3) funding alternatives in electronic PDF format via email or within meeting minutes.
Schedule
RH2 can complete Task 4 within twelve (12) weeks of receiving a signed task authorization
amendment. Task 5 can begin after review and concurrence from the City of the M&I pump station
site, preliminary distribution system layout, and points of connection prepared in Task 4, and RH2
can complete Task 5 within eight (8) weeks.
5
EXHIBIT B
Fee Estimate
Amendment No. 1
City of Pasco
Northwest Irrigation System Study - Phase 2
Jun -21
Description
TotalHours
Total labor
Total Subtonsultant
Total Expense
Total Cost
Classification
Task 4 Irrigation System Preliminary Design
320
$ 53,664
$ 7,475
$ 6,234
$ 67,373
Task 5 Interim Irrigation Operations Plan 1 108 1 $ 18,747 1 $ $ 1,9111 $ 20,658
PROJECT TOTAL 1 428 1 $ 72,4111 $ 7,475 15 8,145 1 $ 88,031