During site selection, the slope of the ground should not exceed which percentage between the MASS and the MRES?

The guideline regarding the maximum slope between the MASS (minimum acceptable surface slope) and the MRES (minimum required elevation surface) is crucial for ensuring proper drainage and stability of structures. A slope that does not exceed 8 percent is recommended to maintain effective water runoff and prevent erosion, which can compromise the integrity of both the construction site and any structures placed on it.

An 8 percent slope allows for sufficient drainage and reduces potential pooling of water, which could lead to foundational issues over time. This standard is especially important in various engineering and construction applications where water management is vital for site longevity and safety.

The other percentage options present steeper slopes which, while possibly permissible in certain contexts, do not align with the best practices for site evaluation when considering both stability and drainage. Adhering to the 8 percent slope ensures that the site selection aligns with the standard practices designed to protect infrastructure from the risks associated with water accumulation and soil erosion.