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1. Density Area Designation: Designations of call density areas were accomplished by <br />reviewing the call density for every square kilometer grid in the County. The grids were <br />normalized by examining the underlying road structure with the goal of creating zones with <br />Rural /Suburban contiguous with Metro /Urban, eliminating anomalous pockets of high or <br />low density in the midst of one of the density areas, and creating a map that can be <br />incorporated into the computer aided dispatch system. <br />Sub -area definitions are for general descriptive purposes only; the actual sub -areas are <br />identified on the maps in this Exhibit. The map defines the subarea, not the actual number <br />of calls received during any period. The identified Sub -areas are subject to change at the <br />discretion of the County. <br />2. Sub - Areas: There are 3 possible Sub -areas contained within each ERZ. <br />Metro /Urban call densities are determined by identifying the square kilometers that <br />average 2 or more calls per month and at least half of the surrounding square kilometers <br />also average 2 or more calls per month. <br />Rural /Suburban areas are those in which the average calls per square kilometer are <br />between 0.25 and less than 2.0 calls per month on average. <br />Wilderness /Low Call Density is determined by identifying the square kilometers that <br />average less than 0.25 calls per month (or one call every 4 months, on average) <br />Alameda County: <br />Urban <br />IRuirall <br />