Utilization of Surrogates to Assess the Removal of Algal Toxins in Conventional Drinking Water Treatment Algal bloom: A Threat to the Environment – Control Strategies using a Non-oxidizing Agent Genetically Transformed Legionella for Application in Engineering Process Validation in the Built Environment Microbial and Toxin Transport Through Soil Aquifer Using 2- Dimensional Model Regional Water Quality Emerging Contaminants Scenario – Opportunistic Pathogens and Indicator Bacteria