PLEASANTON -- One day there might be a huge mixed-use development with nearly 2,300 homes on the northeastern edge of the city. Then again, the land could remain undeveloped for decades to come. Or a smaller project could be built that falls somewhere in between.

All options for the East Pleasanton Specific Plan remain on the table after the City Council voted Tuesday to prepare a specific plan and environmental impact report for 1,100 acres. The huge swath of land is north of Stanley Boulevard and south of Interstate 580, near the city's borders with Livermore and Dublin.

Council members acted on recommendations from the Planning Commission and the East Pleasanton Specific Plan Task Force, a 20-member citizen group that has met for the past 14 months to craft the area's land-use and traffic-circulation plan.

"The Task Force members are, in a way, doing the heavy lifting," City Manager Nelson Fialho said. "They are holding meetings, talking about what's best for Pleasanton and making recommendations to the Planning Commission, which made its recommendation to the City Council."

The draft version of the plan and environmental impact report should be completed by at least late 2014, Fialho said.

Most of the undeveloped land is owned by Zone 7 Water Agency, a public utility responsible for providing flood control and water resources to Pleasanton and other parts of the Livermore-Amador Valley. Legacy Real Estate and Associates, a Bay Area-based company, also owns land in the area.

The specific plan and environmental impact report will study seven proposals, ranging from doing nothing to the most ambitious alternative, which calls for constructing 2,279 residences, office space and retail.

"Somewhere in that range is where the city will land," Fialho said.

Proposed infrastructure improvements could include three road extensions, including one stretching El Charro Road for two miles, connecting it with Stanley Boulevard.

But discussion about any specifics is premature at this point, Fialho said, adding that no decisions will be made until council members and the public have a chance to give feedback to the draft versions of the environmental documents.

"This is just one step of many before the adoption of a specific plan and certification of the environmental impact report," he said. "There's a lot of work that still needs to be done."

Contact Chris De Benedetti at 510-353-7011. Follow him at Twitter.com/cdebenedetti.