<p>The City of San Clemente operates a wastewater treatment plant which treats up to 7 million gallons of wastewater per day. The project involved examination of their wastewater treatment process to determine compliance with current and upcoming rules and regulations established by the United States Environmental Protection Agency (U.S. EPA), California Air Resources Board (CARB), and South Coast Air Quality Management District (SCAQMD). The equipment at the site consisted of two air pollutions control systems, two small boilers fueled by either biogas or natural gas, and a flare fueled by biogas. Included within the audit is a potential to emit calculation of the facility&rsquo;s combustion sources to determine if CARB&rsquo;s Mandatory Reporting of Greenhouse Gas (GHG) Emissions Regulation is applicable to this facility. Other issues where brought to light concerning the H2S emissions of the facility for SCAQMD Rule 431 and the NOx emissions standard of the heat exchangers for the sludge pools for SCAQMD Rules 1146.2 and 1147.</p>