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One involves a small cellar in a rented space that produces 250,000 gallons of cellar wastewater each year. Evacuating the sewage to the NapaSan plant could cost around $ 32,000 per year, while truck transportation to East Bay MUD could cost around $ 30,000 per year, the district estimated.
So in this case, the winery in the airport industrial zone would see a small financial benefit in having their wastewater transported to East Bay MUD.
However, a larger industrial estate winery producing 3 million gallons of cellar wastewater per year could flow into the nearby NapaSan plant for about $ 227,000 per year. Trucking to East Bay MUD could cost around $ 360,000 per year.
In this case, NapaSan looks like the right deal.
But there is always that bigger picture. Should the NapaSan wastewater treatment plant become a trucking destination for wineries across Napa County and perhaps North Bay, a local alternative to East Bay MUD?
For now, NapaSan remains in the same hold mode as it has been for a decade. He’s waiting for a signal from the wine world that the demand is there.
“I think if that starts to happen, I think I want to be part of the bigger solution,” Gregory said. “I think it’s our responsibility and it would be nice if we did.”
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