A group backing the NFL stadium proposal in Inglewood has submitted a petition for a ballot initiative containing more than 22,000 signatures, nearly three times the number needed to put the issue before voters in the city.

The City of Champions Revitalization Initiative would enable the construction of a 80,000-seat stadium and a “performance venue” with up to 6,000 seats on a 60-acre site owned by The Kroenke Group, which owns the St. Louis Rams.

The proposal was unveiled last month.

“This outpouring of support from Inglewood residents is overwhelming and unprecedented, especially when you consider the signature-gathering effort began less than three weeks ago,” said Gerard McCallum, a spokesman with the Hollywood Park Land Co. “Residents are saying ‘yes’ to a once-in-a-lifetime opportunity to create new jobs, fund public services and give us a renewed sense of pride.”

The site is adjacent to the previously approved 298-acre Hollywood Park project, which would be reconfigured under the new proposal.

The initiative would allow the construction of up to 890,000 square feet of retail space, 780,000 square feet of offices 2,500 new homes, a 300-room hotel and 25 acres of parks and open space.

Organizers submitted the petition Monday to the county Registrar-Record’s Office. Election officials now have 30 working days to verify the petition contains 8,400 valid signatures, a figure that represents 15 percent of the city’s more than 55,000 registered voters.

It’s unclear when the initiative will be placed on a ballot, said D’Artagnan Scorza, spokesman for the group that spearheaded the petition effort, Citizens for Revitalizing the City of Champions.

Scorza is founder and executive director of a nonprofit group called the Social Justice Learning Institute, which works to improve “education, health, and well-being of youth and communities of color.”

“This means jobs for the young men I work with,” he said. “It’s a reflection (of how) this initiative resonates with the community as well as the desire of our community to benefit from this type of economic development.”

Scorza said no taxpayer money would be used to pay for the development’s construction.

However, developers would seek an “infrastructure reimbursement” from the city for streets, sewers and the like should the entire development — not just the stadium — generate more than $25 million in annual tax revenues.

“That’s roughly one-third of the city’s operating budget,” Scorza said. “One of the things that makes this such a good deal is it creates a windfall for the city’s budget.”