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Bon Tempe Backwash Line

ProjectBon Tempe Backwash Line
ProgramA1A04 Replacements - Treatment Facilities
Project NumberD23008
ContactHagar Negash | HNegash@marinwater.org
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Map of Southern Marin Line Road and Filter Plant Fire Road
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Aerial view of a water treatment plant surrounded by trees

Project Description 

This project will replace four, 24-inch backwash valves, as well as a 5-foot section of welded steel pipe for the backwash line. It also involves relocation and upgrades to the backwash throttle control valve, and the replacement of the 24-inch backwash tank valve. 

Benefits

This project will provide crucial upgrades and improvements to the Bon Tempe Treatment Plant’s resiliency and longevity. A 5-foot section of the backwash line needs to replacement due to corrosion and cavitation, and the new section will be more corrosively resilient and eliminate the cavitation occurring in that section. The throttle control valve, which was causing the cavitation in that 5-foot section, will be relocated to the parking lot to allow for easier access for maintenance. The new location will reduce the cavitation in the system and increase the longevity of the throttle control valve and the backwash line. Replacement of the backwash tank valve will help isolate the backwash tank for any maintenance work needed on the backwash line.  

Schedule and Status

Design: Winter 2022/23 - Winter 2023/24

Construction: Winter 2023/24

Expenditure Schedule

FY 23 
Estimate 
FY 24 
Estimate 
Total
$100,000
$200,000
$300,000

Funding Sources 

Capital Maintenance Fund 
Other Funding Sources 
Total
$300,000
$300,000