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References
* U.S. EPA (1980). [https://www.epa.gov/septic/onsite-wastewater-treatment-and-disposal-systems Design Manual. Onsite Wastewater Treatment and Disposal Systems]. EPA 625/1-80-012. U.S. Environmental Protection Agency, Cincinnati, OH, US.
:Available at: [http://www.epa.gov epa.gov]
===Acknowledgements===
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