HomeMy WebLinkAboutRH2 Engineering Inc - Task Order No 2018-1 - Physical Capacity Analysis of Irrigation SystemORIGINAL2 PAGE NO 1 OF 6 PAGES
TASK ORDER NO. 2018-1
Reviewed By: (5 $ City Project Code:
REGARDING GENERAL AGREEMENT BETWEEN CITY OF PASCO
AND
RH2 ENGINEERING, INC.
Project Description:
There are remaining opportunities within the current City of Pasco (City) Urban Growth Boundary to provide non -
potable irrigation water. In addition, the westerly side of the City is expanding north of Burns Road. From a planning -
level perspective, the City would like to consider whether the potential infill needs can be met with the existing physical
capacity of the irrigation system, and if expansion of the irrigation system north of Burns Road is within the physical
limitations of the system after infill needs are met.
Scope of Services:
The City would like RH2 Engineering, Inc., (RH2) to perform a physical capacity analysis of the irrigation system based
upon the current service area and determine if expansion of the irrigation system north of Burns Road on the westerly
side of the City is within the physical limitations of the system after infill needs are met. Irrigation water rights are a
known long-term concern and are not part of this analysis.
Time of Performance:
RH2 will proceed with the work within one (1) week of receipt of requested data and will complete a draft for the City to
review within 45 working days.
Fee for Services:
Time and materials not to exceed $19,992
Proposed: C� _' (!ao :3-616
R112 Engineering, Inc. Date
Paul �C'ross, P.E., Executive Vice -President
Approved: Z2 /[�c�—
Ci sco Date
Dave Zabell, City Manager
Professional Services Agreement- RH2 Engineering, Inc.
On -Call Municipal Engineering Services
Page 1 of 1
1'�1917 u11'7
EXHIBIT A
Scope of Work
City of Pasco
Task Authorization No. 1
Irrigation System Capacity Analysis
March 2018
Background
ORIGINAL 2 PAGE NO 2 OF 6 PAGES
The City of Pasco (City) is experiencing rapid growth that approaches 12 percent per year. This growth taxes
the City's ability to provide water supply to its customers. The City water utility includes both a potable water
system that delivers treated surface water to its customers and a non -potable irrigation system that primarily
uses groundwater supplemented with a surface water river intake system.
The City would like RH2 Engineering, Inc., (111-12) to perform a physical capacity analysis of the irrigation system
based upon the current service area. Irrigation water rights are a known long-term concern and are not part
of this analysis.
There are remaining opportunities within the current City Urban Growth Boundary to provide non -potable
irrigation water. In addition, the westerly side of the City is expanding north of Burns Road. From a planning -
level perspective, the Citywould like to consider whether the potential infill needs can be met with the existing
physical capacity of the irrigation system, and if expansion of the irrigation system north of Burns Road is
within the physical limitations of the system after infill needs are met.
Task 1— Data Collection and Review
Objective: Request and review existing data from the City as outlined in the assumptions
Approach:
1.1 Review 2013 Irrigation Master Plan and Department of Natural Resources (DNR) Property Analysis
Memorandum.
1.2 Review existing hydraulic model of the irrigation system and City -provided Geographic Information
System (GIS) shape files. Update the hydraulic model to include known irrigation system infrastructure
(i.e., supply sources, reservoirs, pressure reducing valves, etc.) as provided by the City. Hydraulic
model updating is a highly variable task, and the extent of the updates required are partially unknown
at this time. An initial allocation of eight (8) hours of a hydraulic modeling expert's time has been
identified to update the hydraulic model. If additional time is necessary, RH2 will coordinate with the
City to discuss a contract amendment to provide additional updates to the model, or assumptions
necessary to proceed with the modeling tasks based on the initial allocation.
1.3 Prepare a summary of impacts on the water system, data gaps, and a list of assumptions to be reused
and relied upon in the analysis. This list includes, but is not limited to, average day demand (ADD),
maximum day demand (MDD), peak hour demand (PHD), average lot density, average instantaneous
demand per lot, and average annual use per lot.
Assumptions: The hydraulic model and master plan information will provide enough information for preparing
the basic planning data. It is assumed that the model includes most or all of the irrigation main and nodes in
the system. It is assumed that the City's GIS system includes irrigation mains and service areas that were
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ORIGINAL 2 PAGE NO 3 OF 6 PAGES
City of Pasco Exhibit A
Task Authorization No. 1— Irrigation System Capacity Analysis Scope of Work
derived separately from the model and were not generated from the model. RH2 is entitled to rely on the
accuracy and completeness of any information, data, or materials provided or generated by the City or others
in relation to this Scope of Work.
Provided by City:
• 2013 Irrigation MasterPlan and DNR Property Analysis Memorandum (previously provided).
• Irrigation system hydraulic model (previously provided).
• All irrigation system GIS shape files to be reviewed and included in the hydraulic model.
• All irrigation pump curve or design point information identifying the flow and total dynamic head
provided by each pump.
• All irrigation system settings (i.e., reservoir fill/draw levels, pressure reducing valve settings, pump
settings, etc.)
• 2017 irrigation water use data including total water use, maximum day demand and peak hour
demand by source.
RH2 Deliverables:
• A summary of the items identified in subtask 1.3, to be included in the technical memorandum
identified in Task 2. A draft PDF version of the items will be provided via email correspondence from
RH2 to the City.
Task 2 — Irrigation System Capacity Analysis
Objective: Determine if the potential infill needs in the City can be met with the existing physical capacity of
the irrigation system and if expansion of the irrigation system north of Burns Road is within the physical
limitations of the system after infill needs are met.
Approach:
2.1 Calculate existing (2017) ADD, MDD, and PHD of the irrigation system.
2.2 Calculate the projected infill ADD, MDD, and PHD to be connected to the irrigation system in the
future based upon serving areas within the UGA not currently served by the irrigation system.
2.3 Calculate the system -wide quantity of water supply required for the existing and projected future
conditions and compare those requirements to the system's existing supply capability. Supply
analyses will be performed for the system as a whole, as well as for individual pressure zones orstorage
operating areas.
2.4 Calculate the quantity of water storage required for the existing and projected future system and
compare those requirements to the existing storage capacity of the system. Storage analyses will be
performed for the system as a whole, as well as for individual pressure zones or storage operating
areas.
2.5 Document the surplus or deficient capacity of the existing supply and storage facilities, and compare
the facility capacity to the existing demands, existing demands with projected infill demands, and the
ability to serve an expanded service area north of Burns Road on the west side of the existing system.
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ORIGINAL PAGE NO 4 OF 6 PAGES
City of Pasco Exhibit A
Task Authorization No. 1— Irrigation System Capacity Analysis Scope of Work
2.6 Review the ground surface elevations north of Burns Road on the west side of the existing system and
identify the potential service area for expansion based on the existing pumping abilities and existing
reservoir height.
2.7 Establish facility settings to reflect current settings and those to be used for steady-state hydraulic
analyses.
2.8 Input current land use classifications into the model to allocate existing demands and to calculate infill
north of Burns Road.
2.9 Update hydraulic model node elevations based on Franklin County contour data (or City provided
contour data, if available and provided to RH2).
2.10 Allocate the existing (2017) demand data among the nodes in the model.
2.11 Allocate the future demands into the hydraulic model. Demand distribution shall be based on
estimates of future growth allocations.
2.12 Perform preliminary hydraulic analyses to identify locations for field pressure tests and check
potential performance at each site. Prepare a template that lists field test locations and data that
needs to be collected at each test location.
2.13 Attend one (1) day of field pressure tests.
2.14 Correlate field pressure test data with hydraulic modeling results. This task is variable in nature due
to the unknown relationship between the field data and the hydraulic modeling results. This task
authorization assumes eight (8) hours of a hydraulic modeling expert's time. If additional time is
necessary, RH2 will coordinate with the City to discuss a contract amendment to improve the field and
model correlation, or assumptions necessary to proceed with the available data.
2.15 Using the hydraulic model of the water system, perform a steady-state hydraulic analysis of the
existing system simulating a MDD condition to determine the pressures and flow distribution during
this demand condition. Identify calculated system deficiencies.
2.16 Using the hydraulic model of the water system, perform a steady-state hydraulic analysis of the
existin system simulating a PHD condition to determine the pressures and flow distribution during
this demand condition. Identify calculated system deficiencies.
2.17 Using the hydraulic model of the water system, perform a steady-state hydraulic analysis of the future
system simulating a MDD condition to determine the pressures and flow distribution during this
demand condition. Identify calculated system deficiencies.
2.18 Using the hydraulic model of the water system, perform a steady-state hydraulic analysis of the future
system simulating a PHD condition to determine the pressures and flow distribution during this
demand condition. Identify calculated system deficiencies.
2.19 Identify and input proposed water system improvements into the model, based on the results of the
existing system MDD hydraulic analysis and identification of deficiencies. Perform existing and future
system MDD analyses to confirm proposed improvements resolve deficiencies.
2.20 Prepare a table that summarizes the results of the existing system and future system analyses.
2.21 Export the results of the existing and future system MDD and PHD pressures and flows to a GIS
shapefile for transmittal to the City.
3
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ORIGINAL2 PAGENO 5 OF 6 PAGES
City of Pasco Exhibit A
Task Authorization No. 1— Irrigation System Capacity Analysis Scope of Work
2.22 Meet with City staff to discuss the system analysis results.
2.23 Document the results of the system analysis in summary tables and technical memorandum.
Assumptions: Future work items needed to improve on the validity of the analysis will include but are not
limited to:
Provided by City:
• 2016 and 2017 system production records for all sources in electronic database format (i.e., Excel or
Access)
• Existing land use GIS shapefile.
• Meet with RH2 to discuss the system analysis calculation results.
RH2 Deliverables:
• One (1) day of field testing.
• Attendance at meeting to discuss system analysis results.
• Technical memorandum on system capacity and service area in electronic format (PDF).
Project Schedule
RH2 will proceed with the work within one (1) week of receipt of requested data and complete the draft for
City review within 45 working days
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ORIGINAL2 PAGE NO 6 OF 6 PAGES
EXHIBIT B
City of Pasco
Task Authorization No. 1
Irrigation System Capacity Analysis
Fee Estimate
Task 1 Data Collection and Review 1 16 1 $ 2,886 $ 221 $ 3,107
Task 2
Total
System Capacity Analysis
88
$
Description
S
Total Labor
Total Expense
Total Cost
2.1
Hours
existing demands
4
$
Classification
$
73
$
769
Task 1 Data Collection and Review 1 16 1 $ 2,886 $ 221 $ 3,107
Task 2
Irrigation
System Capacity Analysis
88
$
15,510
S
1,376
$
16,896
2.1
Calculate
existing demands
4
$
696
$
73
$
769
2.2
Calculate projected infill demands
2
$
348
$
37
$
385
2.3
Calculate system -wide water supply availability
1
$
174
$
4
$
178
2.4
Calculate water storage quantities for existing and future system
1
$
174
$
4
$
178
2.5
Document capacity surplus or deficiency
2
$
402
$
10
$
412
2.6
Review expansion area elevations
1
$
174
$
4
$
178
2.7
Establish facility settings
2
$
348
$
36
$
384
2.8
Input land use classifications
2
$
348
$
36
$
384
2.9
Update nodes with elevation data
2
$
348
$
36
$
384
2.10
Allocate existing demands in model
3
$
522
$
41
$
563
2.11
Allocate future demands in model
3
$
522
$
41
$
563
2.12
Preform preliminary analysis and identify pressure test locations
2
$
348
$
36
$
384
2.13
lAttend 1 day of field testing
10
$
1,740
$
182
$
1,922
2.14
Correlate field results
8
$
1,392
$
117
$
1,509
2.15
Perform existing.MDD analysis
2
$
348
$
36
$
384
2.16
Perform existing PHD analysis
3
$
522
$
41
$
563
2.17
Perform future MDD analysis
2
$
348
$
36
$
384
2.18
Perform future PHD analysis
3
$
522
$
41
$
563
2.19
Identify proposed improvements and confirm deficiencies resolved
it
$
1,968
$
159
$
2,127
2.20
Prepare hydraulic analysis summary table
2
$
348
$
36
$
384
2.21
Export modeled results to GIS
2
$
348
$
36
$
384
2.22
Meet with City to discuss results
8
$
1,608
$
135
$
1,743
2.23
Document results in a technical memorandum
12
$
1,962
$
197
$
2,159
PROJECTTOTAL 1 104 1 $ 18,396 1 $ 1,596 1 $ 19,992
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