In 1985, Chula Vista made the largest annexation in California history, which included the neighborhoods of Castle Park and Otay. In January 1986, Chula Vista annexed the unincorporated community of Montgomery, which had previously rejected annexation in 1979 and 1982. At the time of the annexation the community was virtually surrounded by its larger neighbor. Later, San Diego gave way, allowing Chula Vista to annex the Otay River Valley, which was opposed by residents in Otay Mesa & Nestor. Over the next few decades, Chula Vista continued to expand eastward. Plans called for a variety of housing developments such as the Eastlake, Rancho del Rey, and Otay Ranch, neighborhoods. During this expansion a walrus fossil was found, of an extinct species of toothless "Valenictus", after the species was named for the city.</ref> The quick expansion east of Interstate 805 was not embraced by all of the cities residents, leading to advocacy that new housing developments be built with parks, schools, and emergency services. In 1991, Chula Vista elected its first female mayor, Gayle McCandliss, who died from cancer a few weeks after being elected.</ref> In 1995, the United States Olympic Committee opened an Olympic Training Center in Eastlake on donated land; it is the USOC's first master-planned facility and is adjacent to Lower Otay Reservoir. In the last decade of the century, a desalinization plant opened to process water from wells along the Sweetwater River; it was expanded less than two decades later, which included a pumping station built in Bonita.