HomeMy WebLinkAboutTask Order No. 0770 with Murray, Smith and Associates for Well 23 Alternative Improvements AnalysisEXHIBIT A
TASK ORDER NO. 0770
WELL 23 ALTERNATIVE IMPROVEMENTS ANALYSIS
CITY OF MERIDIAN
This Scope of Services is for Professional Services between Murray, Smith & Associates,
Inc. (MSA) and the City of Meridian (City). Task Order No. 0770 shall be for professional
engineering services to analyze improvement alternatives for the existing We1123. Task
Order shall be in accordance with the MSA Master Agreement for Professional Services
dated June 1 ~, 2007.
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Background
Uranium has been detected at levels that approach or exceed the 30 parts per billion (ppb)
MCL established for uranium in the Radionuclide Rule, according to the City's Water Master
Plan update (Master Plan), dated May 2006. Because of these high uranium levels, We1123
is a backup well that is used only during times of peak water demand. Up to this point, the
Idaho Department of Environmental Quality (IDEQ) has allowed wells with chronic
contamination, including uranium, to be used for up to 60 days per year if the levels of
contaminant are less than twice the maximum contaminant level. IDEQ, in a letter to the
City dated February 19, 2008, now states that We1123 cannot be used as a regular water
supply source. Per IDEQ, We1123 can now only be used under emergency conditions when
other system failures require its service and cannot be included in the City's redundancy
calculations. If the Well is utilized, the City is required to flush the system after its use,
collect water samples and distribute a public notification.
MSA will provide an evaluation of alternatives to assist the City in determining what should
be done with We1123 in terms of potential improvements and operations. MSA will review
options to keep We1123 on-line by addressing the high uranium levels. These options and a
recommendation to the City will be summarized in a technical memorandum. A detailed
description of the scope of services is included below.
SCOPE OF SERVICES
Task 1- Kick Off Meeting and Document Review
MSA will attend a kick-off ineeting with City staff to introduce team members, review
project schedule, collect pertinent background information and visit the We1123 site.
Relevant background documents include:
• Hydrogeologist report from We1123 and adjacent groundwater wells
• We1123 record drawings
• We1123 water quality tests
• Redundancy Memorandum prepared for IDEQ, January 28, 2008
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• Master Plan Addendum for switching Well 14 to Zone 4(currently being prepared as
a separate task order)
The kick-off ineeting will also serve as a brainstorming session to discuss the alternatives
currently described in this document as well as to identify other potential ideas that can be
investigated. Fatal flaws with the ideas currently identified will be noted and may preclude
further investigation of the options listed below.
A discussion will also be held at the kick-off ineeting to identify what the City proposes for
the growth oE water demand over the next 5 years (2008-2012). Information from the 2006
Water Master Plan Update can be used or other water projections may be identified.
Assumptions
All information listed above will be provided by the City. 12 hours are budgeted for the
kick-off ineeting/workshop/si~te visit.
Deliverables
1. Minutes from kick-off ineeting.
Task 2 -Alternatives Analysis
In order to help the City decide how to proceed with the operation of the water system that is
supplied by We1123 (primarily Zone 4), under current and 5 year conditions, MSA will first
determine what system improvements are required if We1123 is abandoned. This will focus
on an existing source of supply evaluation compared with current system demands, both
average and peak usage including fire flow. An existing evaluation of supply and demand
has been recently completed as part of the IDEQ Redundancy Requirements. This document
along with the addendum to the master plan that is being prepared as a separate task order for
switching Well 14 to Zone 4 will be used to provide an understanding of the system's
capacity compared with demand. Demand projections identified in Task 1 will be utilized
for a 5 year planning horizon. •
An initial list of alternatives has been identified that include the following:
1. Blending
2. Treatment
3. Aquifer Storage and Recovery
4. New Supply
5. Use for Irrigation Purposes
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Blendi~n~
Evaluating ways to dilute the higher uranium supply from We1123 with water of lower
concentrations is one possible solution. This could potentially be accomplished multiple
ways including:
• Metering water into the distribution in a way that would ensure that adequate
dilution had occurred before the water reaches the nearest customer.
• Constructing a dedicated pipeline from another source to We1123 or vice-versa
enabling the flow to be blended at the source.
• Construction of a reservoir at or near We1123. Water from We1123 would be
pumped to the reservoir where it couid then be diluted with water from the
distribution system or another source directly before boosting into the distribution
system.
Treatment
As part of the 2006 WMP, ion exchange was identified as a potential treatment solution,
however a conceptual level capital cost estimate of $1,400,000 was identified. Currently
available technologies to remove or reduce uranium from the We1123 discharge will be
evaluated to identify other potentially cost effective solutions. The disposal of uranium
waste typically proves to be problematic, even if a cost effective treatment solution can
be identified.
Aquifer Stora~e and Recoverv~ASR)
ASR is considered a potentially viable alternative to address the high uranium levels in
We1123. ASR has proven successful in mitigating uranium problems in existing wells
for other nearby utilities. There are two components to the ASR evaluation; the
evaluation of the hydrogeology of the area (performed by others) and an evaluation of the
mechanical systems needed to implement ASR. MSA will be responsible for evaluating
the mechanical and above ground facilities required for ASR.
New Su}~ply
Ultimately, the City may be faced with restrictions on the number and locations of new
groundwater wells that can be constructed. This may be due to limitations in the
availability of new water rights or the quality of the groundwater available. A high level
evaluation of surface water supply options will be performed by MSA. This evaluation
will look at utilizing treated irrigation water for peak season use or obtaining surface
water rights from the Boise River. Adjacent purveyors will also be contacted to identify
wholesale water supply options for the City.
Use for Irrigation Purposes
A fatal flaw evaluation to analyze the opportunity to utilize Well 23 for irrigation
purposes will be conducted. This task will be evaluated from the perspective of using
water to satisfy existing irrigation needs and thereby reducing the potable water demands
on the overall system. Implications to existing water rights will also be considered. This
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analysis will not include evaluating the cost of installing a separate irrigation system for
existing or future customers.
A meeting with IDEQ is included in this task to discuss the potential options for blending
and treatment at Well 23. The viability of many of the proposed blending options will be as
much or more dependent on regulatory constraints as economic ones. A meeting with the
Idaho Department of Water Resources (IDWR) is also included in this task.
Assumptions
The evaluations described in this task will be fatal flaw level investigations. Planning level
construction cost estimates will be developed for feasible options, in order to compare
alternatives from a cost perspective. These costs will be presented in the Task 3 workshop.
No time has been included in this scope for water distribution modeling and it is assumed
City Staff will provide hydraulic analysis if required.
Deliverables
1. Minutes of ineetings with IDEQ and IDWR
Task 3- Summary Workshop and Documentation
MSA will conduct a summary workshop to discuss the findings of Task 2. At this meeting
each alternative will be summarized and discussed with City Staff. A recommendation on
one or more alternatives to take to a higher level of investigation will be provided to the City.
A scope of work for a more detailed feasibility or predesign will be provided at the
conclusion of Task 3 upon the City's request.
Assumptions
The workshop will not exceed four (4) hours.
Deliverables
A draft doeument summarizing the findings in Task 2 and Task 3 will be delivered to the
City. Upon receiving the City's comments a final document will be del'ivered. Per the City's
request a document will be delivered that provides the scope and budget for a feasibility or
predesign of the selected alternatives. All deliverables will be in electronic format.
BUDGET
The overall not-to-exceed budget for this task is shown in Table 1. The work will be billed
on a time and expenses basis under the terms of the MSA Master Agreement for Professional
Services using the current and projected billing rates from the 2D08 Schedule of Charges.
The total budget shall not be exceeded without written authorization.
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Table 1
Labor Hours and Total Project Costs
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;; Total, Cost
Task 1- Kick-off Meeting and Document Review $1,600
Task 2- Alternatives Analysis $ 16,900
Task 3- Summary Worksho & Documentation $6,000
Pro'ect Totals $24,500
TIME OF PERFORMANCE
The completion date for submittal of the draft technical memorandum is 4 months from
Authorization to Proceed. Schedule for delivery of the final technical memorandum will be
determined at the kick-off ineeting. MSA will make every effort to complete the work in a
timely manner; however, it is agreed that MSA cannot be responsible for delays occasioned
by factors beyond its control, nor by factors that could not reasonably have been foreseen at
the time this Task Order was executed. In particular, a well report for We1123 is being
generated by another consultant that will be required prior to completing this Task Order.
CITY OF MERID AN MUR
BY: /~!~~~/' By: .
TAMMY de ERD, MAYOR Title:
Dated: ~Q' ~"~~U ~ `.~<~``'~'~~~~~~~~~~,,,,,~Dated:
`````~ ~~ ~I~:~-,_ ~~~'~,'.
Attest: ~
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GTY CLEgK SEAL =
JAYCEE L. HOLMAN, ~ ~~ ~
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SM H & ASSOCIATES, INC.
~ .ttic Q. ~
Approved s Content =~~p49~ T z~ .~~~`~~•~ Department Appr al
BY: G °"~~, ~tI~VTY • ~,.~~Y: r
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KEITH WA S, PURC ASING AGENT /, ,""1/1,`` NAME:
Dated: ,~- 27- 0!~ TITLE: e<~3~~T- ~i/''~5 /~~
Dated: ~/y~ ~
T7
Approved as to Form
CITY ATTORNEY
City of Meridian MURRAY, SMITH & ASSOCIATES, INC. We1123 Alt. Imp. Analysis
June 2008 Engineers/Planners 5
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