Rancho Feeding Corporation, a Petaluma slaughterhouse that is the last place to harvest cattle in the Bay Area, reopened on Monday following recalls of more than 42,000 pounds of beef and a two-week suspension ordered by the United States Department of Agriculture. “We’re back open, and we’ve implemented different procedures to make sure that everything is exactly right,” said Scott Parks, the manager at Rancho. He declined to comment further on Wednesday afternoon, saying he…