This document reports on the second meeting of the Pilot Study on Prevention and Remediation Issues in Selected Industrial Sectors. The purpose of the pilot study is to define and explore best practices for reducing the health and environmental impact on soil and groundwater from industrial sectors of interest (e.g., metals mining, organic chemical production, gasworks, and fertilizer manufacturing) as well as other unique site 'types' (e.g., old landfills, privatization sites (i.e., facilities transitioning from former state ownership in certain categories), mega sites (i.e., large scale former industrial and mining facilities), and shoreline sediment sites). The pilot study will explore the techniques and technologies for preventing and avoiding discharge to soil and groundwater as well as measurement and remediation for that industry sector or site type. The second meeting of the Pilot Study was held in Cardiff, Wales from May 23-26, 2004. This meeting dealt with the issues of rehabilitation of old (municipal) landfills. Nineteen technical papers fell under the broad topics of new remediation and monitoring technologies, strategies for completion and aftercare, and managing and treating landfill leachate and gases. The United States is the lead country for the Pilot Study, and nineteen other countries participated in the meeting. This report is a set of abstracts of the presentations at the meeting.