Regarding horizontal directional drill, which of the following statements are correct?

The question asks which statements are correct regarding the plan that must be filed with the Secretary of FERC for review and approval when using Horizontal Directional Drill (HDD) to cross a waterbody or wetland. The plan must include the items listed in sub-statements b through f.

• b) site-specific construction diagrams that show the location of mud pits, pipe assembly areas, and all areas to be disturbed or cleared for construction; This is a standard requirement for environmental plans to ensure all potential impact areas are identified and managed. This statement is correct.
• c) justification that disturbed areas are limited to the minimum needed to construct the crossing; Environmental regulations consistently require minimizing disturbance, especially in sensitive areas like wetlands. Justification for the extent of disturbance is a common requirement. This statement is correct.
• d) identification of any aboveground disturbance or clearing between the HDD entry and exit workspaces during construction; Even with HDD, some surface disturbance might occur or be necessary along the drill path. Identifying these is crucial for environmental assessment and mitigation. This statement is correct.
• e) a description of how an inadvertent release of drilling mud would be contained and cleaned up; Inadvertent returns (frac-outs) are a known risk with HDD. A plan for containment and cleanup is a critical environmental protection measure. This statement is correct.
• f) a contingency plan for crossing the waterbody or wetland in the event the HDD is unsuccessful and how the abandoned drill hole would be sealed, if necessary. HDD can fail, and a backup plan (contingency) for alternative crossing methods and proper abandonment of the failed drill hole is essential for environmental protection and project continuity. This statement is correct.

Since all statements from b through f describe necessary and standard components of an HDD plan for sensitive environmental crossings under FERC regulations, the statement "All are correct!" is the appropriate answer.

The correct option is g).