Opponents of Healdsburg's largest ever proposed development pressed their case in Sonoma County Superior Court on Friday, arguing that the environmental study for the project was faulty in a number of key areas, from calculations on water use to dealing with greenhouse gas emissions.

But attorneys for the developer and the city defended the voluminous environmental documents for Saggio Hills, the 130-room resort and 70 luxury home complex proposed on the city's northern edge.

Now, both sides will have to wait for up to 90 days for a decision from Sonoma Superior Court Judge S. Boyd, who took the matter under submission after hearing arguments for more than more two hours.

The case could be pivotal for Saggio Hills, because a ruling in favor of project opponents could send it back for more hearings, resulting in further delay for a development that once was anticipated to break ground by 2008.

The resort, with room rates estimated at more than $700 a night and homes selling in the multi-million dollar range, is proposed on Healdsburg's last large undeveloped piece of land, 258 acres north of Parkland Farms subdivision.

Along with the luxury elements, Saggio Hills also includes a 14-acre site for affordable housing and other land and money donated for a large community park, fire station and public hiking trails.

Opponents say the current economy and difficulty of obtaining financing for a luxury development rumored to cost as much as $300 million dollars is as much hurdle for developers as is the lawsuit.

"The economy will stop them. There's no funding available," said Jim Winston, a Saggio Hills opponent who attended Friday's court hearings. "All the venture capitalists are feeling like a lobster around boiling water."

Developers declined to comment Friday on the status of their financing, or any of the issues raised in the lawsuit. "Until we get a decision, it's inappropriate to comment," said Tony Korman, one of the partners in Saggio Hills development company.

Supporters of Saggio Hills have joined the lawsuit by filing a friend of the court brief, hiring an attorney and taking out a full page ad in the Healdsburg newspaper promoting the project.

The group is made up of more than 125 individuals and has backing from the Chamber of Commerce, Realtors and the Healdsburg Youth Soccer League.

Saggio Hills proponents said it is a low density clustered development that will generate almost $93 million in fee and tax revenues for Healdsburg over the next 23 years and more than $26 million to local schools.

But opponents complain Saggio Hills will alter Healdsburg's small-town ambience and that its "mega-mansions" will consume scarce resources, especially water.

No one was anticipating a quick court decision Friday since there are multiple issues and more than 14,000 pages that are part of the lawsuit.

Judge Boyd has a split record when it comes to ruling on the adequacy of high-profile environmental impact reports.

He sided with opponents of a proposed Wal-Mart in Santa Rosa and found the environmental studies were faulty. Walmart later decided to abandon the project.

In Sebastopol, he upheld the city's environmental study for the controversial Laguna Vista housing project after the developers said the city was dragging its feet in the process.

On Friday, Healdsburg Citizens for Sustainable Solutions, the group that filed the lawsuit against Saggio Hills, said there were inconsistencies in calculations for how much water Saggio Hills and other development in the city will require by 2025.

The judge noted, however, that there does not appear to be disagreement in the study that that there will be enough water available to handle the project and other future development. But he said the different numbers in the report make it difficult for the public to respond.

Attorney Rachel Mansfield-Howlett said the environmental study failed to consider alternatives that would have less impact on greenhouse gases, water and oak tree removal, for example.

She said there was "an inadequate listing" of all the greenhouse gas emissions.

But Boyd appeared to side with the city and developers on the issue of greenhouse gases, saying "it's too speculative for the city to address it with some specificity."

Les Perry, attorney for the developers, Sonoma Luxury Resort LLC, said there are "no established thresholds of significance" with which to measure greenhouse gases.

And when it comes to environmental impacts in general, he said, state law "does not require perfection, but a good faith effort at full disclosure."

Perry said the environmental study discussed each topic and issue in detail, "just not in the way petitioners would like them to have been discussed."

You can reach Staff Writer Clark Mason at 521-5214 or clark.mason@pressdemocrat.com