RN - Emergency St. Mary Medical Center in Apple Valley, CA. This position is Full-Time and will work 12-hour Mid shifts. Our Emergency Department is a fast-paced environment that sees an average of 240 patients per day. We are Level 4 Trauma Certified and a Stroke and STEMI receiving department. St. Mary Medical Center, has been a part of the community of Apply Valley, California since 1956 and is recognized as one of the best regional hospitals in 6 types of care by U.S.