Summary of the Extreme High Vacuum and Surface Conditioning Workshop The Vacuum Technology Division, the Mid-Atlantic Chapter of the AVS and the Jefferson Lab have sponsored a workshop on Extreme High Vacuum and Surface Conditioning at Jefferson Lab in June 2000. The main focus of the workshop was the limitations of various pumps in achieving XHV. The deliberations included kinetic pumps (turbo-molecular pumps), and capture pumps (ion pumps and cryopumps). Discussions on improvements in vacuum measurement techniques, extreme sensitivity helium leak detection practices, as well as the calibration of such advanced instrumentation systems were an integral part of the workshop. The various topics of interest that were covered in technical sessions include: applications of XHV technologies, a quantitative understanding of virtual leaks, means to eliminate or reduce the various gas sources in XHV systems, XHV materials, XHV vacuum system fabrication methods, XHV technology standards and development of low cost XHV systems. High lights of this workshop will be presented in this talk.