The April 2019 issue of PM Engineer takes an expansive look at the challenges engineers face sizing grease interceptors and how the issue affects municipal sewer systems across the country. Also this month, read exclusive stories about a hydronic water pipeline system installed at a new Four Seasons resort in Calistoga, California, and the value siphonic drains provide in a new manufacturing facility in McPherson, Kansas. Julius Ballanco’s column examines the definition of graywater in plumbing codes, and John Siegenthaler, P.E., gives details for bypassing thermal storage.