Specifications include, but are not limited to: assess the performance of air monitors to ensure that the data being collected is accurate. The goal is for the Department to maintain compliance with federal mandates included in the National Ambient Air Quality Standards (NAAQS), which require that ambient air sites be audited at least once a year and at least 25% of the sites be audited quarterly. The Contractor will conduct multi-point performance audits of Department ambient air monitoring sites within Quarters 1 through 4 of the calendar year, in accordance with USEPA requirements (40 CFR Part 58 Appendix A) and in the presence of a Department employee. The Contractor and the Department will agree on a schedule as to which sites and monitors will be audited each quarter, but each parameter must be done in accordance with 40 CFR Part 58 Appendix A, namely “Each calendar quarter (during which analyzers are operated), evaluate at least 25 percent of the State and Local Air Monitoring Stations (SLAMS) analyzers that monitor for SO2, NO2, O3, or CO such that each analyzer is evaluated at least once per year