Mesa Public Library’s original, 24-year-old fire alarm system reached the end of its life. As a result, the Los Alamos County is wrapping up a project to replace and update the system. County Project Manager Wayne Kohlrust said work started on the project Feb. 5 and the fire marshal will conduct the official test of the system Friday. Kohlrust said the test should pass; the contractor conducted a successful test of the devices in the fire system. The total cost of the project is $150,000 but Kohlrust said the actual cost should be less because a fire watch was not needed to be hired during nights at the library since the contractor was on site during the evening hours when the fire panel was being replaced and library staff conducted periodic walk-throughs of the building during regular hours.