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What is the maximum deviation allowed from grade elevations over a 10 ft straight-edge when installing pavers?

  1. + or - 1/4 inch

  2. + or - 3/8 inch

  3. + or - 1/2 inch

  4. + or - 3/4 inch

The correct answer is: + or - 3/8 inch

The correct answer indicates that the maximum deviation allowed from grade elevations over a 10 ft straight-edge when installing pavers is plus or minus 3/8 inch. This specification is important in landscaping and paving projects to ensure proper drainage, stability, and aesthetics. Maintaining a precise grade is critical as it affects water runoff and the overall functionality of the paved surface. A deviation greater than 3/8 inch could lead to pooling of water, uneven surfaces, or even structural integrity issues over time. The specified tolerance helps ensure that the installation adheres to industry standards, providing a level and safe walking surface while promoting effective drainage. In the context of the other choices, tighter tolerances like plus or minus 1/4 inch may not be practical for all installations due to minor variations in base materials or compaction methods. Likewise, a tolerance of plus or minus 1/2 inch or 3/4 inch would be excessive and could result in significant problems with water drainage and surface usability. Therefore, the choice of plus or minus 3/8 inch strikes an appropriate balance between precision and practicality in landscaping projects.