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The requirement for the top of the septic tank to be located below the finished grade by 6 inches is designed to ensure proper functioning and maintenance of the septic system. This specification takes into account several important factors, including the potential for ground settling and the need for adequate soil cover to protect the tank from environmental elements.

Setting the tank 6 inches below the finished grade helps to ensure that the tank is not overly exposed and reduces the risk of damage due to surface activity, such as landscaping or vehicular traffic. Additionally, this depth allows for sufficient soil insulation, which can help to maintain the temperature of the contents within the tank, promoting effective bacterial activity essential for the treatment of wastewater.

The specific depth outlined in Utah Regulations is in line with best practices for septic system installation, as it balances the need for accessibility for maintenance with functional requirements to ensure the longevity and reliability of the system.