ACAMPO — The setting was a 14-acre grape vineyard, but the mismatched background noise was that of a babbling brook.The roots of some of the old-vine Zinfandel plants were submerged in foot-deep water pumped in from the Mokelumne River, a half-mile away. Other old-vine Zinfandel plants were bone dry.A science experiment being conducted by the nonprofit Sustainable Conservation is taking place on land owned by 81-year-old farmer Al Costa, an enthusiastic [...]