The long-planned Newhall Ranch project has entered its next phase, with developers promising Friday to take a more environmentally sensitive approach as they build the 21,000-home mini-city between the San Fernando and Santa Clarita valleys.

Their commitment came as The Newhall Land and Farming Co. previewed federal and state environmental impact reports that laid out plans for dealing with traffic, air quality, conservation and other issues raised during the years-long process of getting the project approved. The 60-day public comment on the EIR opens Monday.

Newhall Ranch, the largest subdivision in Los Angeles County history, was approved by the Board of Supervisors in 2003, despite residents’ concerns about traffic and the impact on the Santa Clara River, which runs through the project.

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