C.H.Briggs Company, Reading, PA, has appointed Donald F. Schalk as president and Chief Operating Officer.   ; Owner Julia Klein retains the titles of chair and CEO.   ; Before joining C.H.Briggs, Schalk served as president and general manager of EnergyUnited Propane LLC, a regional energy company in North Carolina. Before joining that firm Schalk was president and CEO of Richland Partners LLC, dba Leffler Energy, a $100 million petroleum distribution company, which was formed through a management buyout of Columbia Petroleum.   ; C.H.Briggs Company is an independently-owned distributor of specialty building products on the East Coast.