PURPOSE: This rule describes the steps for the assessment, investigation, and corrective action of contamination of dry cleaning solvents.

1. (1) Owners or operators shall conduct assessments, investigations, and corrective actions of contamination and shall do so in accordance with risk-based guidance developed by the department.
2. (2) When required by the department, owners or operators of active or abandoned dry cleaning facilities shall conduct investigations to determine if the active or abandoned dry cleaning facility is the source of off-site impacts. These impacts include, but are not limited to, the discovery of dry cleaning solvents, the presence of dense non-aqueous phased liquid (DNAPL)/free product or vapors in soils, basements, sewer and utility lines and nearby surface and drinking waters that have been observed by the department or brought to its attention by another party.
3. (3) The department will approve the work plan only after ensuring that implementation of the plan will adequately protect human health, safety and the environment.
4. (4) Upon approval of the corrective action plan, the owner or operator shall implement the plan including modifications to the plan made by the department. Owners and operators shall monitor, evaluate and report the results of implementing the plan in accordance with a schedule and in a format established by the department.

AUTHORITY: section 260.905, RSMo Supp. 2005.* Original rule filed Oct. 3, 2005, effective May 30, 2006. *Original authority: 260.905, RSMo 2000, amended 2005.