ESS Services and Capabilities Environmental Source Samplers, Inc. (ESS) provides a variety of air quality testing and consulting services.  ESS has thorough and substantial experience with air quality regulations and emission source test procedures throughout North America and abroad.  Examples of ESS capabilities are: Emissions Testing Continuous Emissions Monitoring (CEM) Part 75 CEMS Relative Accuracy Test Audits (RATAs) PM, PM10, TSP sampling O2, CO2, NOx, SO2, CO, VOCs, TRS sampling Metals (including Mercury), Hexavalent and Total Chrome, Hydrochloric Acid, Chlorine and Chlorine Dioxide, Ammonia, Formaldehyde and Methanol sampling Method 18 NCASI, NIOSH, and CARB sampling methods Unique source specific test methodologies implemented LELAP Accreditation   Comprehensive Permitting Assistance Clean Air Act (CAA) Title V Application BACT, MACT, NSR Permitting Assistance Due Diligence and Compliance Auditing Minor Air Permit Applications Indoor/Ambient Air Quality and Air Toxic Standards Air Toxics Modeling Accidental Release and Risk Management Programs Industrial Hygiene and Sick Building Syndrome Worker/Public Exposure Risk Assessment Regulatory Compliance Assistance Emissions Inventory Compliance Audits Permit Required Reports Database Management Toxic Release Inventory (TRI) Tier II and Form R Reports