(a) Within 90 days of finding that any of the 40 Code of Federal Regulations Part 258, Appendix II constituents have been detected at a statistically significant level above the groundwater protection standards defined under §330.409(h), (i), or (j) of this title (relating to Assessment Monitoring Program), the owner or operator shall initiate an assessment of corrective measures. Such an assessment shall be completed within 180 days of initiating the assessment.(b) The owner or operator shall continue to monitor in accordance with the assessment monitoring program as specified in §330.409 of this title.(c) The assessment shall include an analysis of the effectiveness of potential corrective measures in meeting all of the requirements and objectives of the remedy as described under §330.413 of this title (relating to Selection of Remedy), addressing at least the following:(1) performance, reliability, ease of implementation, and potential impacts of appropriate potential remedies, including safety impacts, cross-media impacts, and control of exposure to any residual contamination;(2) time required to begin and complete the remedy;(3) costs of remedy implementation; and(4) institutional requirements such as state or local permit requirements or other environmental or public health requirements that may substantially affect implementation of the remedy or remedies.(d) The owner or operator shall discuss the results of the corrective measures assessment, prior to the selection of a remedy, in a public meeting with interested and affected parties. The owner or operator shall arrange for the meeting and provide notice in accordance with the provisions of §39.501(e)(5) of this title (relating to Application for Municipal Solid Waste Permit).