02-06-2013 JWC Agenda PacketAGENDA
JOINT WATER COMMISSION
February 6, 2013 - 1:30 p.m.
Council Conference Room
Golden Valley City Hall
1. Call to Order
2. Approval of Minutes— December 5, 2012
3. Resolution Designating Depositories for Joint Water Funds (13-1) (Virnig)
4. Resolution Tort Liability (13-2) (Virnig)
5. 2012 MMKR Audit Contract (Virnig)
6. AWWA Abstract Submittal Regarding Modeling and Testing Water Interactions (Clancy)
7. Other Business
8. Adjournment
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JOINT WATER COMMISSION MINUTES
Golden Valley -Crystal - New Hope
Meeting of December 5, 2012
The Golden Valley- Crystal - New Hope Joint Water Commission meeting was called to order at
1:32 p.m. in the City of Golden Valley Council Conference Room.
Commissioners Present
Tom Burt, City Manager, Golden Valley
Anne Norris, City Manager, Crystal
Kirk McDonald, City Manager, New Hope
Staff Present
Tom Mathisen, Director of Public Works/City Engineer, Crystal
Randy Kloepper, Utilities Superintendent, Crystal
Guy Johnson, Director of Public Works, New Hope
Bernie Weber, Utilities Supervisor, New Hope
Jeannine Clancy, Director of Public Works, Golden Valley
Dave Lemke, Utilities Supervisor, Golden Valley
Sue Virnig, Finance Director, Golden Valley
Pat Schutrop, Administrative Assistant, Golden Valley
Minutes of November 7 2012 Meeting
MOVED by McDonald, seconded by Norris and motion carried unanimously to approve the minutes of
the November 7, 2012 meeting as presented.
Resolution 12-06 AMSnding the AdoPtgd 2012 General Fund Budget of the Joint Water Commission
Commissioner Norris introduced the following resolution and moved its adoption of the amended
2012 budget amount of $9,267,260.
RESOLUTION 12-06
RESOLUTION OF THE JOINT WATER COMMISSION
AMENDING THE ADOPTED 2012 GENERAL FUND BUDGET
The motion for the adoption of the foregoing resolution was seconded by Commissioner McDonald
and upon a vote being taken thereon, the following voted in favor thereof: Burt, McDonald, and Norris;
and the following voted against the same: none, whereupon said resolution was declared duly passed
and adopted, signed by the Chair and his signature attested by the Vice Chair.
It was necessary to amend the 2012 general fund budget to allow for the water meter improvements
project to be paid for from the Capital Improvements Program. The project was awarded to Magney
Construction in the amount of $759,257 with the cost breakdown as follows:
JWC construction costs: $399,628.50
Minneapolis construction costs: $359,628.50
I:\loint Water Commissicn\JWC Minutes\2012 JWC Minutes\12-05-12 JWC Minutes.doc
Joint Water Commission
December 5, 2012
Page 2 of 2
Clancy added that Stantec has requested additional compensation for design work. Golden Valley has
not reached an agreement with Stantec. If an agreement is reached regarding any additional charges,
Clancy will come back to the JWC for approval.
New Hope Well Update
Mathisen said there was nothing new to report at this time.
County Road 9 Project Update
Mathisen reported that he received the preliminary soil testing report from Brawn and is waiting to
receive the final report.
Other Business
Malloy, Montague, Karnowski, Radosevich & Co., P.A. (MMKR) submitted the contract to prepare the
audit report for the year ending December 31, 2012. The cost for services increased by $200.
MOVED by Burt, seconded by McDonald and the motion carried unanimously directing Chair Burt to
sign the contract with MMKR for the preparation of the audit report for 2012.
Next Meetin>±
The next scheduled meeting is January 2, 2013 at 1:30 pm.
Adiournment
Chair Burt adjourned the meeting at 1:39 pm.
Thomas D. Burt, Chair
ATTEST:
Pat Schutrop, Recording Secretary
I:\Joint Water CommissioM)WC Minutes\2012 JWC Minutes\12-05-12 JWC Minutes,doc
Resolution 13-1
K
February 6, 2013
Commissioner introduced the following resolution and moved its adoption:
RESOLUTION DESIGNATING DEPOSITORIES FOR JOINT WATER FUNDS
BE IT RESOLVED by the Joint Water Commission of the Cities of Golden Valley,
Crystal, and New Hope that the following are named as depositories for funds on deposit
as provided in the Laws of the State of Minnesota:
Wells Fargo Golden Valley
BE IT FURTHER RESOLVED that the following signatories or alternates are
authorized to sign on checks drawn on funds deposited:
General Checking:
Joint Water Chair
Alternate:
Joint Water Vice Chair
BE IT FURTHER RESOLVED that the following shall be authorized to make
investments of Joint Water Funds and shall be authorized to deposit the principal of said
investments in the above named depositories and beneficial to the Joint Water
Commission: Joint Water Chair, Golden Valley's Finance Director; Golden Valley
Accounting Coordinator.
Thomas D. Burt, Chair
ATTEST:
Anne Norris, Vice Chair
The motion for the adoption of the foregoing resolution was seconded by Commissioner
and upon a vote being taken thereon, the following voted in favor thereof: , , and
and the following voted against the same: none, whereupon said resolution was declared
duly passed and adopted, signed by the Chair and his signature attested by the Vice Chair.
Resolution 13-2
Commissioner
0
February 6, 2013
introduced the following resolution and moved its adoption:
RESOLUTION MAKING ANNUAL ELECTIONS
FOR THE 2013-2014 INSURANCE POLICY
WHEREAS, the Golden Valley -Crystal -New Hope Joint Water Commission must
declare whether or not to waive the statutory limits on tort liability established by Minnesota
Statutes 456.04, and
NOW, THEREFORE, BE IT RESOLVED by the Commissioners of the Golden
Valley -Crystal -New Hope Joint Water Commission that it does not waive the statutory limits
on tort liability established by Minnesota Statutes 466.04 for the 2013-2014 insurance
policy.
Thomas D. Burt, Chair
ATTEST:
Anne Norris, Vice Chair
The motion for the adoption of the foregoing resolution was seconded by Commissioner
and upon a vote being taken thereon, the following voted in favor thereof: , , and ;
and the following voted against the same: none, whereupon said resolution was declared
duly passed and adopted, signed by the Chair and his signature attested by the Vice Chair.
5
PRINCIPALS
M M K' R Thomas M. Montague, GPA
Thomas A, Karnox;ki, CPA
Paul A. l adtx cvich, CPA
Will J. Lauer, CPA
CERTIFIED PUBLIC J
anius H, A C C n U NTA ?' T S Aaron J. Niclscn, CP...
Victoria L, Holink i, CPA
December 4, 2012
To the Board of Commissioners
Golden Valley — Crystal —New Hope
Joint Water Commission
7800 Golden Valley Road
Golden Valley, MN 55427
Dear Board of Commissioners:
We are pleased to confirm our understanding of the services we are to provide for the Golden Valley —
Crystal — New Hope Joint Water Commission (the Commission) for the year ended December 31, 2012.
We will audit the financial statements of the governmental activities, each major fund, and the aggregate
remaining fund information, which collectively comprise the Commission's basic financial statements as
of and for the year ended December 31, 2012. Accounting standards generally accepted in the United
States of America provide for certain required supplementary information (RSI), such as Management's
Discussion and Analysis (MD&A), to supplement the Commission's basic financial statements. Such
information, although not a part of the basic financial statements, is required by the Governmental
Accounting Standards Board (GASB) who considers it to be an essential part of financial reporting for
placing the basic financial statements in an appropriate operational, economic, or historical context. As
part of our engagement, we will apply certain limited procedures to the Commission's RSI in accordance
with auditing standards generally accepted in the United States of America. These limited procedures
will consist of inquiries of management regarding the methods of preparing the infonnation and
comparing the information for consistency with management's responses to our inquiries, the basic
financial statements, and other knowledge we obtained during our audit of the basic financial statements.
We will not express an opinion or provide any assurance on the information because the limited
procedures do not provide us with sufficient evidence to express an opinion or provide any assurance.
The MD&A is required by accounting principles generally accepted in the United States of America and
will be subjected to certain limited procedures, but will not be audited.
We will perform the required State Legal Compliance Audit conducted in accordance with auditing
standards generally accepted in the United States of America and the provisions of the Legal Compliance
Audit Guide, promulgated by the State Auditor pursuant to Minnesota Statute § 6.65, and it will include
such tests of the accounting records and other procedures we consider necessary to enable us to conclude
that, for the items tested, the Commission has complied with the material terms and conditions of
applicable legal provisions.
Our services will not include an audit in accordance with the Single Audit Act Amendments of 1996 and
the U.S. Office of Management and Budget Circular A-133, which would only be required if the
Commission expended $500,000 or more in federal assistance funds during the year. If the Commission
is required to have a Single Audit of federal assistance funds, this engagement letter would need to be
modified.
Malloy, Montague, Karnowski, Radosevich & Co., P.A.
5353 Wayzata BouLrard • Suite 4io • ,Minneapolis, MN 55116 1 Telghon,: 952-50.0424 - Telefax:; 952-545-D969 - wwr,mmkr.com
Golden Valley -- Crystal — New Hope Joint Water Commission page 2
December 4, 2012
Audit Objectives
The objective of our audit is the expression of opinions as to whether your basic financial statements are
fairly presented, in all material respects, in conformity with accounting principles generally accepted in
the United States of America and to report on the fairness of the supplementary information referred to in
the second paragraph when considered in relation to the financial statements taken as a whole. Our audit
will be conducted in accordance with auditing standards generally accepted in the United States of
America and the standards for financial audits contained in Government Auditing Standards, issued by the
Comptroller General of the United States, and will include tests of the accounting records of the
Commission and other procedures we consider necessary to enable us to express such opinions, If our
opinions on the financial statements are other than unqualified, we will fully discuss the reasons with you
in advance. If, for any reason, we are unable to complete the audit or are unable to form or have not
formed opinions, we may decline to express opinions or to issue a report as a result of this engagement.
We will also provide a report (that does not include an opinion) on internal control related to the financial
statements and compliance with laws, regulations, and the provisions of contracts or grant agreements,
noncompliance with which could have a material effect on the financial statements as required by
Government Auditing Standards. The report on internal control and compliance will include a statement
that the report is intended solely for the information and use of management, the body or individuals
charged with governance, others within the Commission, and specific legislative or regulatory bodies and
is not intended to be, and should not be, used by anyone other than these specified parties. If during our
audit we become aware that the Commission is subject to an audit requirement that is not encompassed in
the terms of this engagement, we will communicate to management and those charged with governance
that an audit in accordance with auditing standards generally accepted in the United States of America
and the standards for financial audits contained in Government Auditing Standards may not satisfy the
relevant legal, regulatory, or contractual requirements.
Management Responsibilities
Management is responsible for the basic financial statements and all accompanying information as well as
all representations contained therein. As part of the audit, we will assist with preparation of your
financial statements and related notes. You are responsible for making all management decisions and
performing all management functions relating to the financial statements and related notes and for
accepting full responsibility for such decisions. You will be required to acknowledge in the management
representation letter our assistance with preparation of the financial statements and that you have
reviewed and approved the financial statements and related notes prior to their issuance and have
accepted responsibility for them. Further, you are required to designate an individual with suitable skill,
knowledge, or experience to oversee any nonaudit services we provide and for evaluating the adequacy
and results of those services and accepting responsibility for them.
Management is responsible for establishing and maintaining effective internal controls, including
monitoring ongoing activities, to help ensure that appropriate goals and objectives are met. You are also
responsible for the selection and application of accounting principles; and for the fair presentation in the
financial statements of the respective financial position of the governmental activities, the business -type
activities, die aggregate discretely presented component units, each major fund, and the aggregate
remaining fund information of the Commission and the respective changes in financial position and cash
flows, where applicable, in conformity with accounting principles generally accepted in the United States
of America.
Golden Valley — Crystal — New Hope ,loint Water Commission Page 3
December 4, 2012
Management is also responsible for making all financial records and related information available to us
and for ensuring that management and financial information is reliable and properly recorded. You are
also responsible for providing us with (1) access to all information of which you are aware that is relevant
to the preparation and fair presentation of the financial statements, (2) additional information that we may
request for the purpose of the audit, and (3) unrestricted access to persons within the Commission from
whom we determine it necessary to obtain audit evidence.
Your responsibilities include adjusting the financial statements to correct material misstatements and for
confirming to us in the representation letter that the effects of any uncorrected misstatements aggregated
by us during the current engagement and pertaining to the latest period presented are immaterial, both
individually and in the aggregate, to the financial statements taken as a whole.
You are responsible for the design and implementation of programs and controls to prevent and detect
fraud, and for informing us about all known or suspected fraud affecting the Commission involving (1)
management, (2) employees who have significant roles in internal control, and (3) others where the fraud
or illegal acts could have a material effect on the financial statements. Your responsibilities include
informing us of your knowledge of any allegations of fraud or suspected fraud affecting the Commission
received in communications from employees, former employees, grantors, regulators, or others. In
addition, you are responsible for identifying and ensuring that the Commission complies with applicable
laws, regulations, contracts, agreements, and grants for taking timely and appropriate steps to remedy any
fraud, illegal acts, violations of contracts or grant agreements, or abuse that we may report. You are
responsible for the preparation of the supplementary information in conformity with accounting principles
generally accepted in the United States of America. You agree to include our report on the supplementary
information in any document that contains and indicates that we have reported on the supplementary
information. You also agree to present the supplementary information with the audited financial
statements OR make the audited financial statements readily available to users of the supplementary
information no later than the date the supplementary information is issued with our report thereon.
Management is responsible for establishing and maintaining a process for tracking the status of audit
findings and recommendations. Management is also responsible for identifying for us previous financial
audits, attestation engagements, performance audits or other studies related to the objectives discussed in
the Audit Objectives section of this letter. This responsibility includes relaying to us corrective actions
taken to address significant findings and recommendations resulting fi-om those audits, attestation
engagements, performance audits, or other studies. You are also responsible for providing management's
views on our current findings, conclusions, and recommendations, as well as your planned corrective
actions, for the report, and for the timing and format for providing that information.
Audit Procedures— General
An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the
financial statements; therefore, our audit will involve judgment about the number of transactions to be
examined and the areas to be tested. An audit also includes evaluating the appropriateness of accounting
policies used and the reasonableness of significant accounting estimates made by management, as well as
evaluating the overall presentation of the financial statements. We will plan and perform the audit to
obtain reasonable rather than absolute assurance about whether the financial statements are free of
material misstatement, whether from (1) errors, (2) fraudulent financial reporting, (3) misappropriation of
assets, or (4) violations of laws or governmental regulations that are attributable to the Commission or to
acts by management or employees acting on behalf of the Commission. Because the determination of
abuse is subjective, Government Audi ing Nandardy do not expect auditors to provide reasonable
assurance of detecting abuse.
Golden Valley — Crystal — New Hope Joint Water Commission Page 4
December 4, 2012
Because of the inherent limitations of an audit, combined with the inherent limitations of internal control,
and because we will not perform a detailed examination of all transactions, there is a risk that material
misstatements may exist acid not be detected by us, even though the audit is properly planned and
performed in accordance with auditing standards generally accepted in the United States of America and
GovernmerrtAudilingStartdards. In addition, an audit is not designed to detect immaterial misstatements
or violations of laws or governmental regulations that do not have a direct and material effect on the
financial statements. However, we will inform the appropriate level of management of any material
errors and any fraudulent financial reporting or misappropriation of assets that come to our attention. We
will also inform the appropriate level of management of any violations of laws or governmental
regulations that come to our attention, unless clearly inconsequential. Our responsibility as auditors is
limited to the period covered by our audit and does not extend to any later periods for which we are not
engaged as auditors.
Our procedures will include tests of documentary evidence supporting the transactions recorded in the
accounts, and may include tests of the physical existence of inventories, and direct confirmation of
receivables and certain other assets and liabilities by correspondence with selected individuals, funding
sources, creditors, and financial institutions. We will request written representations from your attonieys
as part of the engagement, and they may bill you for responding to this inquiry. At the conclusion of our
audit, we will require certain written representations from you about the financial statements and related
matters.
Audit Procedures — Internal Controls
Our audit will include obtaining an understanding of the Commission and its environment, including
arterial control, sufficient to assess the risks of material misstatement of the financial statements and to
design the nature, timing, and extent of further audit procedures. Tests of controls may be performed to
test the effectiveness of certain controls that we consider relevant to preventing and detecting errors slid
fraud that are material to the financial statements and to preventing and detecting misstatements resulting
from illegal acts and other noncompliance matters that have a direct and material effect on the financial
statements. Our tests, if performed, will be less in scope than would be necessary to render an opinion on
internal control and, accordingly, no opinion will be expressed in our report on internal control issued
pursuant to Government Auditing Standards.
An audit is not designed to provide assurance on internal control or to identify significant deficiencies.
However, during the audit, we will communicate to management and those charged with governance
internal control related matters that are required to be communicated under AICPA professional standards
and Government Auditing Standards.
Audit Procedures — Compliance
As part of obtaining reasonable assurance about whether the financial statements are free of material
misstatement, we will perform tests of the Commission's compliance with the provisions of applicable
laws, regulations, contracts, agreements, and grants. However, the objective of our audit will not be to
provide an opinion on overall compliance and we will not express such an opinion in our report on
compliance issued pursuant to Government Auditing Standards.
Audit Administration, Fees, and Other
We understand that your employees will prepare all cash or other confirmations we request and will
locate any documents selected by us for testing.
Golden Valley — Crystal — New Hope Joint Water Commission Page 5
December 4, 2012
The assistance to be supplied by your personnel, including the preparation of schedules and analysis of
accounts, typing all cash or other confirmations we request, and locating any invoices selected by us for
testing, will be discussed and coordinated with you.
We will provide copies of our reports to the Commission; however, management is responsible for
distribution of the reports and the financial statements. Unless restricted by law or regulation, or -
containing privileged and confidential information, copies of our reports are to be made available for
public inspection.
The audit documentation for this engagement is the property of Malloy, Montague, Karnowski,
Radosevich & Co., P.A. (MMKR) and constitutes confidential information. However, pursuant to
authority given by law or regulation, we may be requested to make certain audit documentation available
to a regulatory agency pursuant to authority given to it by law or regulation. We will notify you of any
such request. If requested, access to such audit documentation will be provided under the supervision of
MMKR personnel. Furthermore, upon request, we may provide photocopies of selected audit
documentation to the regulatory agency. These parties may intend, or decide, to distribute the copies or
information contained therein to others, including other governmental agencies.
The audit documentation for this engagement will be retained for a minimum of five years after the report
release date or for any additional period requested by the regulatory agency. If we are aware that a
federal awarding agency, pass-through entity, or auditee is contesting an audit finding, we will contact the
party(ies) contesting the audit finding for guidance prior to destroying the audit documentation.
William J. Lauer, CPA is the engagement partner and is responsible for supervising the engagement and
signing the report or authorizing another individual to sign it. Our fees for these services will be based on
the actual time spent at our standard hourly rates. We will also bill you for travel and other out-of-pocket
costs such as report production, typing, and postage. Our standard hourly rates vary according to the
degree of responsibility involved and the experience level of the personnel assigned to your audit. Our
invoices for these fees will be rendered each month as work progresses and are payable upon
presentation. Unless additional work is requested, or circumstances require additional work, we estimate
the basic audit fees to be $8,625.
The fee is based on anticipated cooperation from your personnel and the assumption that unexpected
circumstances will not be encountered during the audit. If we find that additional audit procedures are
required, or if additional services are requested by the Commission, those services will be billed at our
standard hourly rates. Additional audit procedures might be required for certain accounting issues or
events such as new contractual agreements, new funds, an indication of misappropriation or misuse of
public funds, or if significant difficulties are encountered due to the lack of accounting records,
incomplete records, or turnover in the Commission's staff.
With regard to the electronic dissemination of audited financial statements, including financial statements
published electronically on your website, you understand that electronic sites are a means to distribute
information and, therefore, we are not required to read the information contained in these sites or to
consider the consistency of other information in the electronic site with the original document.
If you intend to publish or otherwise reproduce the financial statements, and make reference to our firm
name, you agree to provide its with printers' proofs or masters for our review and approval before
printing. You also agree to provide us with a copy of the final reproduced material for our approval
before it is distributed.
Golden Valley-- Crystal —New Hope Joint Water Commission
December 4, 2012
Page 6
Government Auditing Standards require that we provide you with a copy of our most recent extemal peer
review report and any letter of comment, and any subsequent peer review reports and letters of comment
received during the period of the contract. Our most recent peer review report accompanies this letter.
We appreciate the opportunity to be of service to the Commission and believe this letter accurately
summarizes the significant terms of our engagement. If you have any questions, please let us know. If
you agree with the terms of our engagement as described in this letter, please sign the enclosed copy and
return it to us.
Sincerely,
MALLOY, MONTAGUE, KARNOWSKI, RADOSEVICH & CO., P.A.
William J. Lauer, CPA
Principal
WJL:kch
Response:
This letter correctly sets forth the understanding of the Golden Valley -- Crystal — New Hope Joint Water
Commission.
By:
Title:
Date:
I(E BER, ROSE & ASSOCIATES, S.C.
f Certified Public Accountants
4211 N. Lightning Drive, Suite A • Appleton, WI 54913
(920) 993-0105 • Fax (920) 993-0116
ON) 725-5277
System Review Report
To the Principals of Malloy, Montague, Karnowski, Radosevich and Co., P.A.
and the Peer Review Committee of the Minnesota Society of CPAs
We have reviewed the system of quality control for the accounting and auditing practice of Malloy, Montague,
Karnowskl, Radosevich and Co., P.A. (the firm) in effect for the year ended May 31, 2010. Our peer review was
conducted in accordance with the Standards for Performing and Reporting on Peer Reviews established by the
Peer Review Board of the American institute of Certified Public Accountants. The firm is responsible for designing a
system of quality control and complying with It to provide the firm with reasonable assurance of performing and
reporting in conformity with applicable professional standards In all material respects. Our responsibility Is to
express an opinion on the design of the system of quality control and the firm's compliance therewith based on
our review. The nature, objectives, scope, limitations of, and the procedures performed in a System Review are
described In the standards at www.alcpa.org/prsummary.
As required by the standards, engagements selected for review Included engagements performed under
Government Auditing Standards and an audit of an employee benefit plan.
In our opinion, the system of quality control for the accounting and auditing practice of Malloy, Montague,
Karnowski, Radosevich and Co., P.A. In effect for the year ended May 31, 2010, has been suitably designed and
complied with to provide the firm with reasonable assurance of performing and reporting In conformity with
applicable professional standards in all material respects. Firms can receive a rating of pass, pass with
deficlency(ies) or fail. Malloy, Montague, Karnowski, Radosevich and Co., P.A. has received a peer review rating of
pass.
Kat.E-et.,, t 1^4.0' r.�;C,
KERBER, ROSE & ASSOCIATES, S.C.
September 23, 2010
Members of the American and Wisconsin Institutes of Certified Public Accountants
www.kerberrose,com
X61
AMERICAN WATER WORKS ASSOCIATION
Minnesota Section
CALL FOR PAPERS
97th MN AWWA Annual Conference
September 11-13,2013 --Duluth, MN
The intention of this Call for Papers is to identify sneakers for the Minnesota Section
AWWA annual conference
Title of Paper:wK��esi;!!j I 1c_ 1't%4e_r«d;,Hs'C.&n Sur(ett[ U -A'
Primary Author en e
Speaker (if different than author) 60,nn e_
Co-authors and the affiliation:Tv,k► 6oTevrw,0,Sqn,-9, R*J r,
Organization: B a'r r e n i" n e 4 r; ,,
Department:
Mailing Address f+00 ti, EO"" 5+, $,,,
City, State, Zip: M 11,61, o l: S, /Ll N $'S'Y 3 -s"
Phone 9,�_Z "$3?- -
Fax:
Email: TDD P6krr. Gd 1
Would you allow this paper to be published in the Minnesota Breeze magazine? YES! NO
Will this paper be presented elsewhere? YES NO " if yes, where?
Short description of paper content, or attach short description (Attach additional
pages): 4 +ktiLAe�—
SUBMISSION DEADLINE: Thursday January 31, 2013
This form can be found on our website at: www.mnawwa.or2
Submit the form electronically to: Mona Cavalcoli (mcavalcQU a7gmail.com)
Selected papers shall be submitted electronically in both Word and PDF format.
The Joint Water Commission (1WC) is in the process of evaluating an emergency drinking water supply
system comprised of a series of Prairie du Chein-Jordan aquifer wells. The system would be used if
there were a long term Interruption of supply from Minneapolis. As part of the planning process, Barr
Engineering assisted the JWC with the evaluation of the potential for undesirable chemical reactions to
occur upon blending Prairie du Chein-Jordan groundwater with the normal softened surface water
supply from the City of Minneapolis. Chemical equilibrium modeling and bench tests were conducted to
evaluate the potential for formation of precipitates and corrosion of copper service piping. Results were
compared to an AWWARF blending study completed by the City of Bloomington.
Chemical equilibrium modeling using background water quality data for the Prarie du Chein aquifer and
treated Minneapolis water quality suggested that iron precipitation may occur, but will likely be
controllable via application of a sequestering agent, depending on the actual concentration of iron in the
well water. Computer water quality modeling was followed up with bench testing that indicated some
blends of groundwater/surface water may exceed secondary drinking water criteria for iron (0.3 mg/i.
iron), and that most water blends will be near saturation with respect to calcium carbonate.
Calcium carbonate precipitation may be possible for blends containing at least 25-503 well water
depending on the well location and the degree of pH change occurring during distribution.
Recommendations Included application of a blended phosphate to the well water for iron
sequestration/inhibition of copper corrosion and monitoring of system pH during emergency water use.
The results of this study can provide useful information to consumers who notice a change in the
aesthetic quality of their drinking water during emergency supply conditions.