SAN DIEGO — With enforcement of San Diego's new ban on polystyrene foam food trays, pool toys and more scheduled to take effect April 1, city officials are scrambling to coach affected businesses, clarify the complex regulations and consider emergency waiver requests. Such requests include one from a coalition of local grocery stores asking for a two-year reprieve for raw meat foam packaging. The coalition says complying with the new law would sharply raise local meat prices and reduce availability. The long-awaited ban, which was delayed three years by litigation from restaurants and containe...