On Friday, June 29, at 1206 hours, Ambulance 58 (A58) was alerted to Serenity Farm for the heat emergency. A58 responded with 2 personnel. A58 arrived to find a patient suffering from heat exatution. As A58 treated the patient, another patient became ill. A58 started another transported unit bringing Paramedic Ambulance 27 (PA27). The Girls Scouts had a week long camp at the farm where tempatures reached 110 degrees for the day. A58 and PA27 transported to Calvert Memorial Hospital. Engine 54 (E54)also responded to the scene to spray the water to keep the scouts cool. As more patients became ill, the incident was upgraded to a mass casuity. Engine 55 (E55)arrived and assumed command, then Duty Officer 16 assumed the EMS sector. Eight patients were transported to the hospital between A58, PA27, and Calvert Ambulance 47. 280 patients were bussed to the Benedict Firehouse to get in the air conditioned atmosphere. All patients that were not transported to the hospital, were treated and released to parents.