Crest Reservoir, Treatment Plant, and Booster Pump Station The Northeast Sammamish Sewer and Water District needed a minimum of 500,000 gallons of additional storage, and a booster pump station and transmission main to redirect water to supply the new reservoir. As a result of a public outreach effort, the district decided to design the reservoir as a partially buried, reinforced concrete tank and dual-zone booster pump station on a site with a 0.29-acre buildable area. In addition, water quality sampling discovered arsenic at both supply wells and hydrogen sulfide at one supply well. RH2 completed an analysis of several treatment alternatives for removal of arsenic and hydrogen sulfide based upon treatment effectiveness, cost and compliance with the district’s policy of providing a chemic

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