The Technical Review Workgroup (TRW) Bioavailability Committee recently published the "Guidance for Sample Collection for In Vitro Bioaccessibility Assay for Arsenic and Lead in Soil and Applications of Relative Bioavailability Data in Human Health Risk Assessment." This is an update to the 2015 Guidance for Sample Collection for In Vitro Bioaccessibility Assay for Lead (Pb) in Soil. The update is intended to help EPA risk assessors, remedial project managers, and on-scene coordinators develop and use bioavailability data at their sites. It incorporates sample planning and data analysis recommendations from EPA's Guidance on Systematic Planning Using the Data Quality Objectives Process that are pertinent to sampling for In Vitro Bioaccessibility (IVBA) and Relative Bioavailability (RBA). It also clarifies the application of IVBA and RBA data to human health risk assessment, the development of risk-based goals at CERCLA remedial and removal sites and includes arsenic (As) which was recently added to the In Vitro Bioaccessibility Assay. The TRW has developed a series of trainings based on the updated guidance. This session will focus on a discussion of soil sample planning and data evaluation to assess confidence in site assessment and remediation decisions at soil arsenic & lead contaminated sites. EPAs new bioavailability sampling guidance tool will also be presented.  This training will target a general audience of regional staff working in risk assessment, remediation, emergency response, technical support, and quality assurance. The training will be an approximately one and half hours long and will include time for general discussion. Members of the Bioavailability Committee and a Regional representative will be present to answer questions in real time. To view this archive online or download the slides associated with this seminar, please visit http://www.clu-in.org/conf/tio/IVBA-3_031824/