To argue that an aquifer is unusable for a lower Soil Matrix score, what must be provided?

The option indicating that documentation of water quality and quantity determinations must be provided aligns with the necessary criteria for establishing that an aquifer is unusable. In the context of assessing an aquifer's usability, it is crucial to evaluate both the quality and quantity of the water it can supply. This documentation serves as concrete evidence of the water's safety for consumption or other uses, and it aids in making informed decisions regarding the aquifer's status.

For an aquifer to be deemed unusable, it must be demonstrated that the water quality does not meet acceptable standards or that the quantity is insufficient to meet demand. Other potential options, such as historical land use approvals, site cleanup certifications, and soil composition reports, while relevant in different contexts, do not specifically address the critical factors of water quality and quantity. Therefore, the correct answer highlights the need for focused evidence pertinent to the aquifer itself, which is essential for making accurate determinations about its usability.