Normally, 'facility' refers to the site that the object or entity is contained at, which may include many other objects. No soil or water is to be brought into the containment facility of SCP-XXX. Rather than this, you should just specify that they should be stored in darkness. Sealed rooms and a lack of windows are normal, those aren't worth mentioning.

The wooden box is to be contained in a sealed room with no windows or artificial lighting. If the specific things mentioned aren't absolutely critical to maintaining the safe containment of the object, then they need to be revised to reflect the actual purpose of the procedure or removed as unnecessary. Why a wooden box specifically and why wood chips? If all we have are silica packets or industrial desiccants, we're just screwed? Remember, all Special Containment Procedures must be directly related to the object or entity's specific anomalous traits. SCP-XXX is to be stored in wooden box along with 1300 grams of woodchips to absorb any moisture.