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Jul 30, 2014
Fishing Clinic

Aug 04, 2014 6:30 PM
City Council Meeting

Aug 05, 2014 5:00 PM
Night Out Against Crime

Aug 18, 2014 6:30 PM
City Council Meeting

Sep 01, 2014
City Offices Closed - Labor Day Holiday

Sep 02, 2014 6:30 PM
City Council Meeting

Sep 15, 2014 6:30 PM
City Council Meeting

Oct 06, 2014 6:30 PM
City Council Meeting

Oct 20, 2014 6:30 PM
City Council Meeting

Nov 03, 2014 6:30 PM
City Council Meeting

  

WATER SYSTEM INFRASTRUCTURE IMPROVEMENTS

The City of East Moline Water System is faced with several issues in complying with current and future State and Federal Regulations while replacing our aging infrastructure so we can continue to serve our customers now and into the future.

Complying with new regulations will be tricky.  One of the new regulations will require more treatment and disinfections while the second regulation puts limits that are more stringent on disinfection by products.

In order to comply with current regulations we need to increase capacity in the treatment plant and elevated storage. 

The treatment plant has a rated capacity of 10 Million Gallons per Day (MGD).  The Illinois EPA (I-EPA) requires that we must be able to supply our historical peak demand of 7.6 MGD in a worst-case scenario.  With one treatment unit out of service (worst-case scenario), the treatment plant can only supply 7.5 MGD. 

For elevated storage, the I-EPA requires that we maintain our average daily demand in elevated storage for emergencies (fires, water main breaks, power outages, etc).  The current average daily demand for East Moline is 5 MGD; we have 2.6 MG in elevated storage. 

In order to continue to meet the needs of the community now and in the future something must be done to replace and upgrade the aging infrastructure.  The original treatment plant was built in 1955 with an expansion in 1966, this means valves, and some of the mechanical equipment is between 40 and 50 years old and beyond their useful life of 30 years. 

Portions of the distribution system and storage facilities are approximately 100 years old and beyond the end of their useful life.     

With these issues in mind, it was determined to take a pro-active approach to address these problems and resolve them before issues with state and federal regulations arise, which in turn would cost our citizens more.    

To take a pro-active approach a plan needed to be developed.  To assist in developing this plan Veenstra & Kimm, Inc. of Moline was hired to complete a comprehensive water system study with phased projects that would address the issues addressed above. 

A plan was developed in four major areas;

            Water Treatment Plant

            Water Distribution

            Water Storage

            Water Pump Stations

  for the V&K Water System Study  (This file is very large, will load slow)

 

Water Treatment Plant

To meet current and new regulations the capacity of the basins will need to be improved.  This can accomplished with the installation of baffles in the basins, creating longer treatment contact time, improving water quality and assisting in meeting the new regulations.  This approach is very positive, it addresses the issues we have and it effectively reduce expansion costs because no buildings or tanks are added. 

                  

UV uses a light source to kill bacteria and cysts that can cause illness in humans, it will not leave a residual as chlorine does; therefore, it increases disinfection complying with the new regulations and effectively reduces disinfection by-products.  UV will not eliminate the use of chlorine but it will allow us to use less, consequently reducing the by products chlorine and organic material create.  

If we continue to use chlorine as our primary disinfectant, more chlorine and a longer detention time (more tanks and buildings) will be required; this will in turn create more disinfection by produces in the finished water creating a compliance problem with the new regulations. 

                  













The installation of the UV units will require modifications to the filter piping, it is planned to replace the valves that are between 40 and 50 years old; this will increase the efficiency of filter operation and reduce water loss through the treatment process by eliminating leakage past the valves. 

Improvements planned for the clearwell (underground tank where water is stored before being pumped to the elevated tanks) are to improve finished water allow removing the clearwell from service for maintenance and repairing.  These improvements are not a priority at this time but these plans are being made when the need arises. 

         

The electrical system at the water treatment plant was installed with the original plant in 1955.  Over the last fifty years, a substantial amount of electric load has been added to the original electric system and transformer.  Currently the transform is operating close to 100% capacity on an average day.  During hot days, when there is a larger demand for water, the transformer is operating over 100% capacity.  The electrical system within the plant is operating over capacity on a daily basis.  There are plans to replace and upgrade the electrical system, including the transformer, to the proper size, with some room for possible future expansion.  

With improvements made to the electrical system, the EPA will require back-up generation to eliminate interruptions in your water supply due to a power outage.  Back-up generation will do two other things,

  • It will gain us credit for elevated storage.  With the back-up generator, a continuous supply of water can be treated and pumped to elevated storage reducing the risk of low pressure due to an emergency.
  • There is the possibility that the power company will offer a special electric rate or incentives to reduce energy costs.      

During the improvements to meet current and future regulations it is planned to replace and upgrade equipment that is no longer function properly that will increase efficiency in the overall operation of the treatment process. 

High service pumps are being added at the water treatment plant to eliminate unneeded mechanical equipment.  Currently water is pumped from the treatment plant to the reservoir across the street and then pumped from the reservoir to the distribution system.  These high service pumps will allow us to pump directly to the distribution system, eliminating twice as much power to get the water to the customer, reduce the number of pumps by two and eliminate the reservoir, which is in need of major repairs.  By eliminating this pump station, required back-up generation is also, eliminated for this site.   

         
  

With the additional pumps, modifications to the piping leaving the plant will be required.  These modifications will create additional feeds from the treatment plant to the distribution system, providing our citizens a more reliable water supply. 

Water Storage Improvements

Correcting the deficient elevated storage capacity can be accomplished in two different ways.  Back-up generation at the treatment plant and pump stations, will gain some credit for elevated storage.  However, we need to maintain or current elevated storage and increase it as the demand increase. 

                            Currently five elevated storage tanks serve East Moline.  Two of the tanks are at the end of their useful life; they are approximately 100 years old.  One tank is slated for demolition; it is not economically feasible to repair this tank because of the size and age.  The second tank is in need of major repairs or very possibly demolition.  If the second tank is removed, it will need to be replaced.   

The third tank is in need of major repairs before un-repairable damage is done.  This is due to a failed protective coating on the inside of the tank.  There is major corrosion damage being done at this time and needs to be address as soon as possible to protect our citizens' large investment in this structure. 

The remaining two tanks are in need of maintenance in the next three to five years to prolong their life and to continue to protect the investment in these structures.  

Two 1.5 MG elevated storage tanks are planned in order to continue to meet EPA's requirement for elevated storage.  These tanks will be built as demand increases and in areas where the demand is created.  

Pumping Stations

The river intake pumping station will require improvements to meet pumping capacity requirement.  In order to meet this requirement two of the smaller pumps will need to be replaced with larger pumps, which will require upgrades in the electrical system, back-up generation and modifications to the piping. 

In order to meet pumping capacity requirements at the 21st Avenue Booster Station a stationary back-up generator is required.  The existing generator at the River Station is planned to be moved to this site to gain pumping capacity.

These problems face us today for several different reasons.  Two major reasons are,

  • Aging Infrastructure
  • New State and Federal EPA Regulations

East Moline is not alone with these problems; many other communities face with these same issues throughout the United States.  Over the past 100 plus years, systems were built to serve the communities of proportionate size at that time, and to meet regulations at that time. 

Now with new regulations and infrastructures beyond their designed useful life there must be a large re-investment in communities to protect the health and safety of the community as well as the environment in which we live. 

These problems and cost will not go away.  Problems will only compound, as will costs.  By addressing them now, costs will be kept to a minimum, while preserving our community.

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