One detail was omitted from last week’s write-up on the city of Stockton’s concerns about how the Delta tunnels might impact the city’s new water treatment plant. This is a bit wonky. Stick with me. The story is all about the city’s fear that water quality will deteriorate at the intake for its $220 million drinking water plant, forcing expensive treatment upgrades that could jack up rates, theoretically, by up to 200 percent. But it’s not just water quality that is of concern. It’s quantity, too. That may sound strange.