PLEASANTON — A group trying to block a planned Costco in Pleasanton has collected enough signatures to force the City Council to either enact a ban on big-box stores, or put it before voters.

The Pleasanton City Council will take up the proposed ballot measure at its meeting 7 p.m. Tuesday at City Hall, 200 Bernal Ave.

Citizens for Planned Growth, a citizens group, collected some 5,013 signatures of valid Pleasanton voters, easily exceeding the 4,015 signature minimum required to get the initiative certified, Tim Dupuis, the Alameda County Registrar of Voters reported this week

The initiative would bar the city from approving a big-box store in a 40-acre development area along Johnson Drive parallel with Interstate 680 and north of Stoneridge Drive.

The council has the choice of enacting the ban, putting it before voters on the November ballot, or calling a special election in spring that would cost the city $312,000 to $394,000, according to a report by city staff.

Costco critics say they are worried about traffic from a big-box store.

Contact Denis Cuff at 925-943-8267. Follow him at Twitter.com/deniscuff or facebook.com/denis.cuff.