DUBLIN — In a tentative ruling, an Alameda County Superior Court judge this month ordered the city of Dublin to conduct an environmental study of a successful ballot measure that opened the boundaries of a protected open space area before breaking ground on the land.

Judge Michael Markman on Oct. 1 wrote that he “intends to grant” a petition filed by two open space advocate groups that sought to repeal the ballot measure. He plans to make a final decision this month, pending any challenge or objection from city officials.

The two groups — Save Mount Diablo and Friends of Livermore — who sued to block the “land grab” measure voters approved last year considered the judge’s ruling a victory. Measure II had paved the way for potential commercial development in the Doolan and Collier cany

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