Wisconsin Mound Soil Absorption System and Area FillPractice Exam

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The sand used in the construction of a Wisconsin mound system should not contain more than what percentage of fines?

  1. 3%

  2. 5%

  3. 7%

  4. 10%

The correct answer is: 5%

The recommended percentage of fines in the sand used for the construction of a Wisconsin mound system is not to exceed 5%. This specification is crucial because fines, which refer to the smaller particles in the sand, can impede water movement and affect the system's ability to properly drain. If the sand contains too many fines, it can lead to clogging of the absorption system, resulting in reduced efficiency and potential system failure. Maintaining the right percentage of fines ensures that the sand allows for adequate percolation of effluent, thus supporting the intended treatment of wastewater in the mound system. Proper drainage is essential for preventing issues such as surface seepage or backup, which can have significant health and environmental implications.

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