The Heritage Impact Assessment (HIA) within the framework of the UNESCO/Republic of Korea Fund-in-Trust “Support for the Asian Silk Roads World Heritage Serial and Transnational Nomination(s) (Phase II)” Project and in close cooperation with the UNESCO World Heritage Center (WHC) was initiated to support the State Party of Kyrgyzstan in evaluating the impact of the proposed project aimed at replacing critical water supply networks, rehabilitating water supply and waste water systems in the city of Uzgen on the site of Uzgen and its wider setting. The site has been listed on Tentative List of Kyrgyzstan since 19.02.2010 (Ref.: 5518). The Kyrgyz Republic Water Supply and Wastewater Rehabilitation Extension project is being implemented with financial and organizational support of the European Bank for Reconstruction and Development (EBRD) since 2015. Uzgen Sub-project (OpID 46705) was added under the framework extension. "Site History and Description. Background" presents the historic background and the development of Uzgen site, including the evolution of the standing structures and the setting of the property since 4th century BC. The values and attributes of the site as a property placed in the UNESCO World Heritage Tentative List since 2010 and a component of the prospective serial transnational World Heritage Nomination Silk Roads: Fergana-Syrdarya Corridor were identified. Desk studies revealed that the component parts of Uzgen site and its wider setting contain valuable archaeological layers, which have not been fully studied until today. The team: Prof. Yukio Nishimura is an expert in conservation planning, physical urban design and public participation in planning / Dr. Arch. Ona Vileikis is an architect and heritage specialist / Prof. Bakyt Amanbaeva is an archaeologist, cultural heritage expert / Dr. Dmitriy Voyakin is a UNESCO international expert / Chynarbek Zholdoshov is a historian, archaeologist and expert in heritage safeguarding and management / Alim Feyzulayev is an architect, specializes in conservation and heritage management / Denis Sorokin is an architect, specialist in advanced computer technologies in archaeology