SAN FRANCISCO -- Opponents say replacing soccer fields grass with artificial turf at San Francisco's Golden Gate Park is a health hazard.

The SF Coalition for Children's Outdoor Play, Education and the Environment has filed a lawsuit saying the environmental impact report didn't consider the health risks of chemicals used in the turf.

The coalition tells the San Francisco Chronicle (http://bit.ly/TkOpL6 ) that kids shouldn't be playing on toxic fields.

The Board of Supervisors, city planners and recreation and parks commission have already approved replacing the four grass soccer fields with an artificial surface.

Construction was supposed to begin in January,

But the California Coastal Commission issued a stay this month while it considers a coalition appeal.

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Information from: San Francisco Chronicle, http://www.sfgate.com