Rinker Design Associates, P.C. (RDA) is a diverse, client-oriented firm that offers a truly unique style of civil engineering consulting. Since 1982, we have built a solid reputation for providing conscientious and reliable service to municipalities, governmental agencies, and private entities throughout Virginia -- service that our clients and their communities deserve. Based in Virginia and certified as a small business, RDA provides high quality professional engineering and surveying services from our four offices located in Manassas, Fredericksburg, Glen Allen (Richmond), and Virginia Beach.