Skills RequiredWet Chemistry, Excel, Data EntrySkills PreferredWet chemistry skills specific to an Environmental Compliance Lab: Total Suspended Solids (TSS), Settleable Solids (SS), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), Total Residual Chlorine (TRC), pH, e. As an Environmental Lab Technician, you will be responsible for conducting wet chemistry analyses such as Total Suspended Solids (TSS), Settleable Solids (SS), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), Total Residual Chlorine (TRC), pH, e.