A Napa Valley-based vineyard-owner-turned-entrepreneur is using a new technique to find water. Napa Valley insurance broker and Pritchard Hill vineyard-owner Gary Jaffe has formed a new company called Aquifer Exploration Co., LLC. with the hopes of making well digging a little more predictable. If the method lives up to its early promise, it should allow landowners to dig wells with a much greater likelihood of success.Like many vineyard owners, Jaffe found that his existing well didn't meet his...