answer number five and four please

4. MCLG: Maximum Contaminant Level Goal (MCLG) describes how much of the contaminant may be present with no adverse health effects. MCLGs are non-enforceable public health goals. MCL are standards that are set by the United States Environmental Protection Agency (EPA) for drinking water quality. An MCL is the legal threshold limit on the amount of a substance that is allowed in public water systems under the Safe Drinking Water Act. The limit is usually expressed as a concentration in milligrams or micrograms per liter of water 5. A wastewater stabilization pond will be used in a municipal wastewater treatment system as a discharge point or detention pond. Please perform literature survey or google search and answer the following questions: (1) Explain the functions of bacteria and algae in pollutant removal that grow together in the pond. (2) Explain why algae would be a problem if present in the discharged pond water (3) Define mechanisms of different practices or technologies that you know could be utilized to control algac (4) Explain what facultative pond is and why it is created in stabilization pond