The group is called the Santa Clarita Organization for Planning the Environment. It wants to prevent Orange-based developer SunCal Cos. from further bulldozing on a 489-acre parcel that runs along the banks of San Francisquito Canyon Creek, north of Copper Hill Drive in northern LA County.

The project would include hundreds of multifamily homes in addition to single-family houses. The lawsuit claims county officials illegally issued a grading permit without assuring that there would be enough water for all the new residents.

A hearing on the lawsuit is scheduled for Wednesday.

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