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Station Location, Apparatus, and Staffing Analysis Roseville, MN Typically, incident densities (i.e., the number of incidents that occur within various parts of the city) are generated by geocoding their addresses/locations. However, information regarding incident locations was not available in CAD data provided by the city of Roseville, which precluded the examination of incident densities for this analysis. Response Time Analysis The first step in the deployment analysis was a review of department-wide response times. Response time is the total elapsed time between an individual dialing 911 and emergency service personnel arriving at the scene. Response times can be broken down into multiple segments for analysis: call processing, dispatch, turnout, travel, and the overall (total) time taken to arrive at the incident. As noted, RFD provided twelve months of CAD data for the 2007 calendar year. In some cases, there were obvious errors (e.g. the unit arrived before the call was made). They were excluded from the dataset used in the analysis. In addition, outliers that were more than three standard deviations from the mean were eliminated. If response times have a normal distribution, 99.7 percent of incidents are expected to fall within three standard deviations, and the 0.3 percent of incidents that was excluded from the response time analysis likely contains errors. Call Processing and Dispatch Time -Call processing time includes the time to get information from the caller (i.e., call initiation) and enter it into the dispatch system record. This is measured from the time the call is received to the time the call is transferred to a dispatcher. Dispatch time begins when the 911 call is transferred from the call taker to a dispatcher and continues until units are alerted to respond. Many jurisdictions consider call processing and dispatch together as a single time segment. Data for call initiation times was not easily procured by RFD, making it difficult to calculate the call processing time interval. To address this challenge call processing times are extrapolated from St. Paul Minnesota Fire Department's call processing times that were calculated in a previous TriData study conducted in 2005 as they belong to the same dispatch center as RFD. RFD and St. Paul Minnesota Fire Department call processing times are largely similar. The overall call processing times at the 90~' percentile for all responding units and call types was 1 minute, 1 second and an average of 32 seconds. When broken down by call type, EMS calls were processed and dispatched more quickly than fire calls, meeting the recommended goal of 1 minute 90 percent of the time. Fire call processing and dispatch times were slightly higher than the 1 minute goal, with 1 minute 9 seconds at the 90a' percentile. Nevertheless, overall call processing and dispatch times for both types of calls are extremely good. System Planning Corporation 9 May 2008 TriData Division