The BEST sanitary landfill method for a location with rolling terrain is the:

The area or ramp method is the best sanitary landfill approach for locations with rolling terrain due to its design and operational efficiency. This method allows for the construction of landfills that can adapt to the natural contours of the land, minimizing disturbance to the landscape and effectively utilizing the available space.

With the area or ramp method, waste is placed in a series of layers or ramps, which can follow the slope of the terrain rather than trying to level it out. This approach facilitates effective drainage and compaction of waste materials, critical for controlling leachate and enhancing the stability of the landfill structure. Additionally, it can reduce the risk of erosion and other environmental impacts that might arise from more disruptive landfill methods.

In contrast, methods like the vertical method and trench method may not be as suitable in rolling terrains due to their reliance on significant excavation and deep cut operations, which might not be practical in such landscapes. The spread and compact method, while useful in some settings, does not adequately address the specific challenges presented by rolling topography in terms of effective waste management and environmental protection.