HomeMy WebLinkAboutRH2 Engineering, Inc - West Pasco Water Treatment Plant Improvements Amendment No. 1 (Agreement No. 20-021) (Project No. 16008)AMENDMENT NUMBER 1 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, all parties to this agreement agree that this addendum will not modify or
change any other terms of the Professional Services Agreement (No. 20-021).
NOW, THEREFORE, this agreement is amended to allow RH2 Engineering, Inc. to
provide additional design engineering services described within Exhibit A.
1. Scope of Work:
See Exhibit A
2. Fee:
The compensation for this amendment is based on a Time and Materials Basis is not to
exceed the amount of $19,075.00 for a total contract amount of $665,649. 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.
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DATED THIS DAY OF 2020.
CITY OF PASCO:
Steve Worley, Public Works
CONSULTANT
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R112 Engineering, Inc.
Paul Cross, PE — Project Manager
Amendment No. 1 to Professional Services Agreement Page 1
RH2 Engineering, Inc.
16008 — West Pasco Water Treatment Plant Improvements
EXHIBIT A
Scope of Work
Amendment No. 1
City of Pasco
West Pasco Water Treatment Plant Improvements
Transient Analysis
December 2020
Background
Raw water is pumped to the West Pasco Water Treatment Plant (WPWTP) from the Columbia River
raw water intake as a vital part of the City of Pasco's (City) water supply. The raw water intake is
sized to handle current and future expansion; however, the intake pump station currently is
equipped with pumps for a 6 million gallons per day (MGD) supply. At the WPWTP, the raw water is
pre -chlorinated and fed a coagulant prior to passing through two pre -filtration strainers. The
pretreated water is then filtered using two parallel membrane module systems, each with a capacity
of 3 MGD, for a total capacity of 6 MGD. Filtered water is sent to a clearwell to meet chlorine contact
time (CT) requirements and provide storage ahead of the high service pump station to the
distribution system.
The system pressure that the raw water intake pumps against is variable in nature and is subject to
a number of process changes and modulating valves. The original 6 MGD service pumps were
designed without a transient analysis to verify the impact of pump startups, valve position changes,
or pump shutdowns on system pressures.
As the system is expanded from 6 MGD to 12 MGD, and eventually to 18 MGD, transient pressures
may become even more significant and may need to be quantified. In addition, control measures
may need to be added to the facility to mitigate for the anticipated future pressures. This Scope of
Work captures services necessary to support hydraulic transient analysis for the current system and
for planned system expansions. A Transient Analysis Report will be developed for the City's use. Upon
completion of the report, future tasks or scope changes to the expansion design may be necessary
to mitigate for the transient pressures identified.
Task 1— Data Collection and Extended Period Simulation Model Setup
Objective: Obtain supervisory control and data acquisition (SCADA) data during operations of the
raw water pump station on one (1) second intervals for a month prior and including the failure event
so that it can be used to verify and calibrate the extended period simulation model necessary for the
transient analysis.
Approach:
1.1 Write a script as necessary to extract the historical data from the City human machine interface
(HMI) computer for pressures and flows from the raw water intake and along the process train
to the chlorine contact chamber wherever flow and pressure are logged.
1
City of Pasco
West Pasco Water Treatment Plant Expansion Design
Transient Analysis
Scope of Work
Amendment No. 1
1.2 Coordinate with City personnel to run the script on the WPWTP HMI computer and extract the
data for analysis purposes.
1.3 Review and compile the extracted SCADA data into a format that can be used to verify the
model results identified in Task 2.
1.4 Set up the existing City WaterGEMS hydraulic model for an extended period simulation
between the intake facility and the WPWTP.
Assumptions:
• The City has a backup of the Historian file from the date of failure that is still accessible.
• SCADA data polling times are accurate enough to represent transient events (one (1) or two
(2) second intervals are preferred).
• Only the applicable portions of the City's infrastructure between the intake and the WPWTP
will be set up for extended period simulation analysis. Other pipes, demands, and
infrastructure downstream of the WPWTP will not be included in the extended period
simulation set up or analysis.
•
It is assumed that the hydraulic model provided by the City is up to date with all system
improvements and has been calibrated to industry standards.
Provided by City:
• One (1) month of historic SCADA data when the raw water intake was operational.
RH2 Deliverables:
• Script to extract historic data from Wonderware HMI computer.
Task 2 — Existing Hydraulic Transient Analysis
Objective: Perform a hydraulic transient analysis of the existing infrastructure between the intake
and WPWTP.
Approach:
2.1 Analyze up to three (3) scenarios of an extended period simulation of the WPWTP and perform
a hydraulic transient analysis using HAMMER.
2.2 Compare results of transient analysis with SCADA data and adjust the model to match boundary
conditions and SCADA data.
2.3 Re -run the three (3) scenarios, finalize comparison of model results to SCADA data, and perform
internal quality assurance and quality control (QA/QC) review.
2.4 Prepare graphs of results and list assumptions for final calibration and virtually meet to discuss
with the City.
2
City of Pasco
West Pasco Water Treatment Plant Expansion Design
Transient Analysis
Assumptions:
Scope of Work
Amendment No. 1
• The results of the hydraulic transient analysis output from HAMMER will be able to capture
verifiable pressures identified in the SCADA data.
In the event that the analysis does not correlate with SCADA information, a more detailed
theoretical analysis may be required. A more detailed analysis is outside this Scope of Work.
RH2 can provide the additional services with the support of a subconsultant as an amendment
to the agreement if the City feels the additional analysis is merited.
• If a detailed theoretical transient analysis is recommended, the report and analysis of 12 MGD
and 18 MGD will be put on hold until the City decides what level of effort is merited.
Provided by City:
• Attendance at virtual web meeting to review graphs and results.
RH2 Deliverables:
• Attendance at virtual web meeting to review graphs and results.
• Graphs and results of transient analysis in electronic PDF format included as part of the Task 4
deliverables.
Task 3 — Transient Analysis for 12 MGD and 18 MGD
Objective: Perform a hydraulic transient analysis of the infrastructure between the intake and
WPWTP for future flow conditions at 12 MGD and 18 MGD.
Approach:
3.1 Run up to two (2) scenarios of an extended period simulation of the WPWTP for both 12 and 18
MGD (four (4) total scenarios) and perform a hydraulic transient analysis using HAMMER.
3.2 Compare results of transient analysis with previous analysis performed at 6 MGD and adjust the
model to match boundary conditions and SCADA data.
3.3 Re -run scenarios, prepare graphs of results, and list assumptions.
3.4 Identify up to three (3) transient mitigation options for transient control measures, including
incremental solutions needed for intake supplies of 6 MGD, 12 MGD, and 18 MGD.
RH2 Deliverables:
• Graphs and results of transient analysis in electronic PDF format included as part of the Task 4
deliverables.
City of Pasco
West Pasco Water Treatment Plant Expansion Design Scope of Work
Transient Analysis Amendment No. 1
Task 4 — Transient Analysis Report
Objective: Summarize hydraulic analysis results.
Approach:
4.1 Prepare draft summary report of hydraulic transient analysis and mitigation options included in
Tasks 2 and 3.
4.2 Summarize the potential impacts to the WPWTP in the operational events surrounding the
catastrophic event in the summer of 2020 and perform internal QA/QC review.
4.3 Review draft report with the City, receive feedback, update the report, and finalize.
Provided by City:
0 Attendance at virtual web meeting to review draft report.
RH2 Deliverables:
0 Attendance at virtual web meeting to review draft report.
• Draft and final reports in electronic PDF format.
4
EXHIBIT B
Fee Estimate
Amendment No. 1
City of Pasco
West Pasco Water Treatment Plant Improvements
Transient Analysis
Description
TotalHours
Total Labor
Total Subconsultant
Total
$ - $
269
$
3,348
1.1
Write a script to extract historical SCADA data at WPWTP
T��]
............ ....................... .......... ............ ............. .......... ............................................................................ _....................... ....... - ............... .... ...
Classification
1,152
$ - $
29
_ _$
1,181_
Task 1
Data Collection and Extended Period Simulation Model Setup
20
$
3,079
$ - $
269
$
3,348
1.1
Write a script to extract historical SCADA data at WPWTP
8
$
1,152
$ - $
29
_ _$
1,181_
1.2
Coordinate with Cid staff to run script and extract data
2
$
340
$ - $
36
$
376
1.3
_
Review and compile SCADA data
_
603
13_0 _
$
933
1.4
Set u WaterGEMS model for extended period simulation
_
4
$
784
rt -
$ - $ _
75
$
859
Task 2
Existing Hydraulic Transient Analysis
27
$
4,903
$ - $
535
$
5 438
2.1
Analyze up to three (3) scenarios of extended period simulation and HAMMER
10
$
1856
$ - . _$
211
$
2,067
2.2
Compare HAMMER results with SCADA data and adjust model
3
$
536
$ _ - $
68
$
604
2.3
Re -run three (3) scenarios and finalize com arison to SCADA data
3
$
536
$ $
68
$
604
2.4
Prepare gra hs of results and list of assumptions and meet with City
11
$
1,975
$ _ - $
187
$
_ 2,162
Task 3
Transient Analysis for 12 MGD and 18 MGD
29
$
5,017
$ - $
648
$
665
3.1
Run up to four (4) scenarios of extended period simulation and HAMMER
8
$
1,360
$ -_ $
199
$
_ 1,559
3.2
Compare HAMMER results with 6 MGD results and adjust model
6
$
1,072
$ - . $
137
$
1,209
3.3
_
Re -run scenarios, prepare graphs of results, and list assumptions
8
$
1,360
$ - $
199.
$
1,559
3.4
Identify up to three (3) options for transient control for 6, 12, and 18 MGD
7
$
1,225
$ - $
113
$
1,338
Task 4
Transient Analysis Report
26
$
4,172
$ - $
451
$
4.
{ 4.1
draft summary report
12
$
1,692
$ $
243
$
1,935
j 4.2
_
Summarize potential impacts to WPWTP prior to catastrophic event
4
$
710
$
I 4.3
-Prepare
Review draft report with City, update and finalize
10
$
1,770
$ $
163
...
PROJECTTOTAL
102
$
17,171
$ $
1,904
$
19,075