Monterey One Water officials on Monday moved closer to its goal of providing additional water for the Monterey Peninsula when it unanimously approved a key environmental report for its expansion project. The 10 members of the board of Monterey One Water all voted to approve an environmental document called a supplemental environmental impact report, or SEIR, that advances closer to the expansion of its regional treatment plant. Monterey One is the sewer treatment provider in northern Monterey County that has invested in proven technology that can purify wastewater to the degree it becomes drinkable. It is then reintroduced into local groundwater.