A 20-foot breach in a San Joaquin River levee that forced an evacuation order for a large swath of rural farmland was plugged by emergency crews late Monday, a levee engineer confirmed.For the time being, however, an evacuation order for about 500 people issued shortly after 7 p.m. remained in place.The levee break came at the end of a long, sopping wet day that saw officials at Don Pedro Reservoir east of Modesto open a gated spillway for the first time since the 1997 [...]