Marriage vows will be exchanged by Amy L. Peterson and Gregory S. Schintzius at 4 p.m. today in Rich Renaissance Niagara, preceding a reception. The Rev. Gerald Hilfiker of St. Paul's Episcopal Church, Springville, will perform the nuptial ceremonny for the daughter of Clarence and Lois Peterson of Cheektowaga and the son of Dawn Schintzius of South Wales and the late Paul Schintzius. A graduate of Cleveland Hill High School and Tri State University, the bride is a civil engineer with DiDonato Associates. She is corresponding secretary of S.G.T.V. Edelweiss and is a volunteer usher at Shea's Center for the Performing Arts. The bridegroom is a graduate of Iroquois Central High School and is owner of Dawnvale Dairy Farm. After traveling in California, they will be at home in South Wales.