The City of Buckley has a population of approximately 5,000 residents and is a rural WashingtonState community located about 40 miles southeast of Seattle. Like many communities using anunfiltered surface water source,the City was required by the Washington State Department ofHealth (DOH) to provide a treatment system capable of meeting the Surface Water TreatmentRule (SWTR). The high costs associated with most treatment processes were beyond the City’sfinancial capability. Instead,the City embarked upon an ambitious plan to restore a structurallyfailed 1.0 Million Gallon (MG) ground-level concrete reservoir,upgrade a 60-year old controlweir house,and construct within these components a 1 Million Gallon per Day (MGD) slow sandfiltration plant. Successfully completed in 1997 for approximately $400,000,the slow sandfiltration plant currently operates at 1.2 MGD and is driven by less than 24 inches of hydraulichead. Nearly all of the original 1930s era facilities were utilized in the construction of thetreatment plant. Power at the site is required only for the chlorinator,programmable logiccontroller (PLC) and an electric actuated valve.This presentation describes the project from initial pilot plant testing through construction andfinal startup. The challenges associated with restoring abandoned facilities,incorporatingexisting components into a unique design process,and overcoming site construction issues areexamined with the use of a slide presentation. Instrumentation,sand cleaning,and startup issuesare discussed as well.The engineering feasibility of economically utilizing existing structures to meet future regulatoryrequirements was demonstrated by the City of Buckley slow sand filtration project Theapplicability of renovating facilities for similar processes could be expanded to other smallmunicipalities.
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