Once the hole is drilled, cased, and plumbed, what should be done before leaving the site?

Before leaving the site after drilling, casing, and plumbing a hole, it is crucial to secure the site to prevent any accidents or injuries. A suitable cover welded to the top of the casing ensures that the hole is safely sealed, preventing unauthorized access and minimizing the risk of someone accidentally falling into it. This is particularly important in environments where heavy machinery and equipment are present or where there may be a potential for future work to occur.

By covering the top of the casing, not only is safety maintained, but it also protects the integrity of the casing and any equipment that may later be used in that area. The other options, while relevant to site maintenance and safety, do not specifically address the immediate safety requirement of securing an open hole, making the installation of a cover the most critical action before leaving the site.