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Comprehensive Assessment of Emergency Medical Services 70 <br />and 911 /Communications Center Operations Study <br />For purposes of the diagram that follows, the average call duration calculated for 2011 (48 minutes) was <br />used for each call recorded. <br />Figure 20 <br />Actual Ambulance Demand Profile -23 May 2011 <br />MAY 23rd <br />5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM <br />The five (5) hour period depicted includes the actual calls and the times that they were dispatched. The <br />duration of the individual calls varied from 18 minutes to 1 -hour and 44 minutes, and for all 18 calls <br />noted the average duration was 51 minutes. The "Available Units: 7" notation is the number of Medic <br />Units on duty during the referenced 5 -hour time frame. <br />Note that during this five hour period there were three (3) instances where 6 of the 7 on duty <br />ambulances were in service simultaneously; resulting in the circled number "1" referring to the last <br />available ambulance. Subsequently, the remaining ambulance was in all likelihood directed to "move" <br />to a location that would permit the most flexible response should another call come in before another <br />ambulance was available. <br />This scenario was found to occur many times during the review of the 2011 EMS call records. <br />Solutions for Local Government, Inc. 26 <br />