Clear Waters Operator Quizzes Operator Quiz #125 – Potluck Operator Quiz #126 – Health and Safety Operator Quiz #127 – Activated Sludge Operator Quiz #128 – Pumping Safety Operator Quiz #129 – Operator Safety Operator Quiz #131 Operator Quiz #123 – Basic Conversion Factors, Digester Gas Operator Quiz #124 – Health and Safety Operator Quiz #101 – Mathematics Operator Quiz #102 – Biological Treatment Operator Quiz #103 – Biological Treatment Operator Quiz #104 – Anaerobic Digestion Operator Quiz #105 – Wastewater Potpourri Operator Quiz #106 – Pumps, Equipment and Safety Operator Quiz #107 – Formula Exam Operator Quiz #108 – Laboratory Operator Quiz #109 – Primary/Preliminary Treatment Operator Quizzes #110-112 – Rotating Biological Contactor; Disinfection; & Digesters Operator Quizzes #113-114 – Nutrient Removal, Activated Sludge, Etc. Operator Quiz #116- Definitions Operator Quiz #117- Mean Cell Residence Time Operator Quiz #118- Pumps Operator Quiz #119- Definitions & Process Troubleshooting Operator Quiz #120- Operations Questions Operator Quiz #121- Math Math Math Operator Quiz #122-Aeration