HomeMy WebLinkAboutII. COW Agenda Item Draft Minutes 02/23/2010
COMMITTEE OF THE WHOLE MINUTES
February 23, 2010
I. CALL TO ORDER - ROLL CALL
The meeting was called to order at 7:08 p.m. in the Village Board Room of the Village
Hall, 50 South Emerson Street, by Mayor Irvana Wilks. Present at the meeting were
Trustees Paul Hoefert, Arlene Juracek, John Korn, John Matuszak, Steven Polit, and
Michael Zade!. Staff present included Assistant Village Manager Dave Strahl, Public
Works Director Glen Andler, Public Works Deputy Director Sean Dorsey, Water and
Sewer Superintendent Matt Overeem, and Administrative Analyst Michael Dallas.
II. ACCEPTANCE OF MINUTES
A motion to approve the minutes of January 12, 2010's Committee of the Whole Meeting
was made by Trustee Korn and seconded by Trustee Polit. All trustees approved the
motion, except for Mayor Irvana Wilks who abstained. Additionally, a motion to approve
the minutes of January 12, 2010's Special Meeting was made by Trustee Hoefert and
seconded by Trustee Matuszak. All trustees approved the motion, except for Mayor
Irvana Wilks who abstained.
III. CITIZENS TO BE HEARD
No citizens requested to be heard.
IV. DISINFECTION BY-PRODUCTS RULE STAGE 2 COMPLIANCE & HYDRAULIC
WATER MODEL
Assistant Village Manager Dave Strahl initially introduced the topic of discussion and
emphasized that the water distribution system computerized hydraulic modeling report
should be characterized as a water system capital improvement plan and not as a
mandate. Additionally, he noted that any projects related to this model will be funded
using existing capital funds within the water fund.
Public Works Deputy Director Sean Dorsey started his presentation by describing the
initial purpose for the water system model: the Disinfection By-Products Rule. He
indicated that the Rule, promulgated by the United States Environmental Protection
Agency (US EPA). was intended to reduce the potential for the creation of disinfection
byproducts in water systems. These disinfection byproducts, some of which could be
carcinogens, can be produced when chlorine, added to the water system as a
disinfectant, breaks down after time. The hydraulic water model was used to determine
where the water within the system was the oldest. Public Works employees then tested
chlorine levels at those locations to determine the levels of carcinogens. After running
the model and taking multiple samples, it was determined that the Village has very clean
water and very low carcinogen levels, thus eliminating the need to conduct future
monitoring or take corrective actions.
Mr. Dorsey stated that the water model was also used to evaluate how the Village's
water system responds to pressure variances. A water system model had not been
conducted since the 1980's and not since the Village began receiving water from the
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Northwest Suburban Municipal Joint Action Water Agency (NSMJAWA). Mr. Dorsey
emphasized that the software modeling is the most practical way to test the water
system and simulate demand to see how the system reacts throughout the Village in
light of different scenarios (emergencies, capital improvements, heavy usage periods,
and other).
Mr. Sean Dorsey then introduced Mr. Randy Patchett, a consultant from Burns and
McDonnell, who conducted the water system study. He began his presentation of the
water distribution system computerized hydraulic modeling report by confirming that the
Village met the U.S. EPA Disinfection By-Product Rule requirements. Then he
discussed the Village's existing water system, identifying the supply, storage, and
distribution system. He described the computer software used to the model the Village
water system, known as the MWH InfoWater Suite, and explained in great detail how the
software was calibrated to correctly model the Village's water system. He then noted the
model's evaluation criteria, explaining what would be considered good conditions for the
system.
Mr. Patchett conducted two different types of simulations: (1) a steady state; and (2)
extended period simulation. The steady state scenario, which modeled the Village's
water system utilizing a day with maximum usage, indicated that NSMJAWA could meet
the Village's water supply needs without the Village's existing booster pump stations and
elevated tank operating, but could not distribute the water adequately without the
assistance from the stations or the tank. Accordingly, he stated that booster stations
would have to operate and be actively managed in order to distribute the Village's water.
Mr. Patchett also conducted another steady state simulation to verify how the system
would perform on a maximum use day with firefighting demands. He identified the fire
flow requirements for the types of structures in the Village. The results of the model
simulation indicated that the Village would need to use booster pump stations to meet
potential fire flow demands. He also noted that under these conditions water pipe
around the booster stations and tanks could be more stressed due to the additional
usage demand impacting smaller diameter water main exiting booster and tank
locations. Mr. Patchett recommended enhancing the automation of the booster pump
stations to address these concerns. Using fire flow analysis illustrations, Mr. Patchett
compared the difference between a Village system operating with no booster stations
and one operating with the recommended supervisory control and data acquisition
(SCADA) system improvements (modifications to the control logic).
Mr. Patchett also conducted an extended period simulation on the Village's water system
which helps show flow patterns for water quality and where water quality might be
deteriorating. He reemphasized that the Village's water quality is very good and well
above the national average. The extended period simulation indicated that all
NSMJAWA supply facilities had inefficient pumps, and its high velocity and pressure
contributed to the Village's water main breaks.
The simulation also examined alternative sources of water, including existing wells and
interconnections. The results indicated that if the NSMJAWA supply was lost, the
Village could bring its existing wells on-line to supply a sufficient amount of water to its
residents.
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Mr. Patchett's analysis also evaluated the water connections across Northwest Highway.
He noted that the low pressure experienced south of Northwest Highway could be
mitigated by improving the SCADA logic to the booster stations, as well as installing an
elevated tank south of Northwest Highway or adding more water connections that cross
Northwest Highway.
Mr. Patchett also examined the Village's water main break history. While not excessive,
he noted the number of breaks was higher than the national average. He identified
some possible causes for the breaks, how the Village is addressing those breaks, and
some correlations between the breaks and the operation of the elevated tank and
booster pump stations.
Finally, Mr. Patchett identified the report's multiple recommendations, including their
estimated costs and benefits. Before inviting comments or questions from the Village
Board, Mr. Dorsey reemphasized the report's recommendations would be gradually
phased-in over time, and that ultimately the report should be considered a water system
capital improvement guide.
General comments, questions or concerns from the Village Board included the following:
· Very thorough and detailed report;
· Do we put chemicals into our wells;
· When replacing water pipes, do we use thicker pipes to reduce stress on the
water distribution system;
· Are the booster pumps variable speed;
· How long does it take for chlorine to break down into its by-products;
· How does NSMJAWA water delivery affect the Village's water pressure;
· How do we determine how a water main or pipe breaks;
· How does the SCADA software work to manage the water pressure in the
system;
· Does Public Works own the software to model the water system for future use
and can it conduct the simulations;
· Where was the system difficult to model;
· Should there be concern about the water pressure on the south side of the
Village of Mount Prospect;
· Should residents be concerned about water sitting in faucets;
· How does water flow in the system;
· Does the Public Works Department receive water pressure complaints;
· How do we control high pressure surges;
· Does chlorine have any negative affects;
· Do we charge other communities for providing them water;
· If the Village had multiple water towers throughout the community, would it still
need booster pumps.
Before moving on to the next agenda item, Mr. Dorsey presented the status of the Public
Works Department's Sewer Maintenance Program. He noted that over fourteen (14)
miles of combined sewer mains and over nineteen (19) miles of sanitary sewer have
been rehabilitated to date. He also noted that all Category 5 defects, eighty-three
percent (83%) of Category 4 defects, and ten percent (10%) of Category 3 defects in
combined sewer system have been repaired.
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V. ENERGY STRATEGY PLAN
Michael Dallas, Administrative Analyst, described the Energy Strategy Plan's major
revisions since it was first introduced in December 2009 and then invited questions and
comments from the Board.
General comments, questions or concerns from the Village Board included the following:
. Easy to understand and use as a guide in the future;
. Identify the terms "sustainability" and "renewable energy";
. The Plan can be used as a part of the education process;
. Does the Village pay for all of the train station's energy costs;
. Are the number of therms used at the Public Safety building (under Figure 2.2)
correct;
. Concern about establishing a sustainability committee.
VI. VILLAGE MANAGER'S REPORT
Mr. Strahl had nothing to report.
VII. ANY OTHER BUSINESS
Mayor Wilks briefly discussed the 2010 Census promotional efforts. She also provided a
brief update on the Levee 37 project.
VIII. ADJOURNMENT
The meeting adjourned at 9:37 p.m.
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