Professional, friendly, and responsive, Robert Peccia and Associates (RPA) is a full service Montana civil engineering and su ... rveying firm serving federal and state agencies, municipalities, and private clients and organizations. RPA works throughout the United States as well as internationally. - Water Systems - Wastewater Systems - Site Development - Storm Drainage - Structural Engineering - Natural Resources - Highways and Urban Streets - Traffic and Transportation - Airports - Environmental Documents - GIS/Graphic Design - Land Surveying /Subsurface Utility Engineering (SUE) read more