S.D. Codified Laws § 34A-16-39
The reviewing authority shall complete its review pursuant to § 34A-16-38 and make its decision within ninety days following submission of the plan for review. The reviewing authority shall approve the designation plan if the plan satisfies the requirements of §§ 34A-16-35 to 34A-16-37, inclusive, or, in the case of designation to disposal facilities, if the reviewing authority finds that the plan has demonstrated that the designation is necessary and is consistent with the comprehensive waste management plan. The reviewing authority may attach conditions to its approval that relate to matters required in a designation ordinance under §§ 34A-16-41 and 34A-16-42. Any substantive amendment to the plan shall be submitted for review in accordance with this section.
SDCL 34A-16-39