Big Sandy Rural Health Clinic The Big Sandy Rural Health Clinic also resides inside the medical center.  Two physician assistants provide health care to patients of all ages. Edna Streit, PA-C Edna Streit, PA-C is a native of North Central Montana and a graduate of the Physicians Assistant program at Rocky Mountain College in Billings. Edna's practice includes patients of all ages. Steven Arnold FNP Steven Arnold, FNP, provides a full spectrum of family medical care to patients of all ages. With a nursing and respiratory therapy background, Steven is well prepared to work in the clinic and hospital of Big Sandy Medical Center.