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Clear water promised with Ball Park plant
Ball Park wells could provide 1,300 gallons of water per minute
By Dennis Box
Bonney Lake's Ball Park Well filtration plant has been completed and went online Monday.
The $2 million plant was started June 28, 2004 and is designed to filter and clean the iron and manganese from the water drawn from the two Ball Park wells.
The wells are located next to Emerald Hills Elementary.
The filtration plant has a tank 26 feet long and 10 feet in diameter with four filter cells inside. When empty, the tank will hold 15,000 gallons.
"There is an anthracite media on top to filter out particles," explained Dan Mahlun, engineer for RH2, the firm that designed the filtration system. "After the anthracite, the water hits 24 inches of pyrolucite where the manganese dioxides are absorbed."
Below the floor of the plant is a 54,000-gallon storage tank that recycles water from the filters back into the system
According to Mahlun, the filtration system loses only 1 percent of the water during the entire process.
The filtration tank was built after the city received a flood of complaints about the Ball Park well's brown water.
The water was pumped into the city's system during the 2003 summer drought.
The city said the brown water was caused from high levels of iron and manganese. Staff said the water was tested as safe, but taste and appearance was bad.
Because of the need for city water during peak use periods, a second well was drilled last year.
The depth of well No. 1 is 290 feet and well No. 2 is 240 feet.
The two wells are expected to pump about 1,300 gallons per minute.
The Ball Park wells are one of four water systems supplying the area. Victor Falls Springs, Tacoma Point Well field and Grainger Springs also supply water.
In 2004 the city purchased Tacoma Water rather than use unfiltered water from the Ball Park wells.
The filtration plant is operated by an on-site computer system.
Mayor Bob Young said the city will hire a plant manager to oversee the operation of the system.
Dennis Box can be reached at firstname.lastname@example.org.