07/14/2015 (4) - Laserfiche WebLink

Home Browse Search

ANALYSIS: KHA has evaluated in detail the SCADA system and found that amongst other components the control panels at the NCRO plant need immediate attention. In order to keep NCRO running efficiently the corrective actions on the two panels are critical. Therefore, for the following reasons staff request BCC waive the bid process and permit IRCDUS request three (3) quotes from qualified vendors: • These panels control chemical feed and transfer pumps,which are critical to maintaining water quality to customers and pumping treated water to storage. When they fail, which they have done, the following occurs: ➢ Water production stops and the clearwell overflows. Treatment continues but no treated water makes it to storage. ➢ Water quality(pH, hardness,turbidity)suffers and inconsistent water quality is produced. ➢ Chlorine residual can be lost and the water is not properly disinfected,potentially creating non-compliance issues. ➢ Overdosing of chemicals can lead to high/low pH, bleached water, and turbid water, all resulting in out of compliance finish water. • The existing hardware is antiquated, no longer manufactured, and is no longer supported from a software perspective. • It is unreliable and cannot restart automatically when power is lost. This requires manpower to manually restart the systems while the clearwell can overflow and water quality is jeopardized. • Signals from these panels continue to vary wildly and are not reflective of what water quality is produced. Controlling feed rates of chemicals must be done manually and automation is non-existent. • Continued overflowing of the clearwell when the panel fails may cause structural damage to the clearwell,the critical component to treating and pumping water to storage. • Data is unreliable and has to be collected and input manually. • Parts are not available from the manufacturer, requiring third-party purchases which have recently been as much as$40,000, more than 5 times the cost of the newer ones. o The condition of these panels is worsening exponentially due to the corrosive conditions and many of the conductors, instruments, etc.are failing. KHA, anticipates to have the necessary specifications and details ready towards the end of July for requesting quotes from the qualified vendors. Furthermore,the Engineer's Opinion of Probable cost to range$80,000 to $100,000.00 for the corrective actions needed for the two(2) panels. FUNDING: Funding for the SCADA upgrades is available in the SCADA upgrades account within the Utilities Operating Fund. Operating funds are derived from water and sewer sales. ACCOUNT NO: Description Account Number Amount SCADA Upgrades 47123536-044699- 15504 $100,000.00 69 F:\Utilities\UTILITY-Engineering\WATER\Water Plant SCADA upgrades\Admin\Agenda-Waive Bid Process.docx