This course will present remedy selection, design and implementation considerations for the emerging use of in situ solidification/stabilization (ISS) to manage impacted sediments, as an alternative to, or to supplement dredging and capping.
The potential audience includes owners, regulators, design consultants and contractors. Overview: The remediation of sediments, especially those in urban waterways, can be complex and expensive. Traditionally, remedies at these sites have centered on dredging impacted sediments with upland treatment or disposal. More recently capping of impacted sediments, often with active treatment layers, has seen increasing use. However, the range of remedial technologies available to manage impacted sediments has not been as broad as the range of tools available for upland site remediation. ISS has seen increasing use on upland sites, originally for treatment of metals and more recently for treatment of organics and NAPL. ISS is a technology that treats soils and sediments in place by mixing with admixtures or reagents intended to alter physical or chemical characteristics of the soil/sediment. Over the past several years an effort has been made to adapt ISS technology for the in-place treatment of sediments. While the use of ISS is not appropriate under all conditions, the development of this technology will provide another tool that can effectively manage sediments. The use of ISS may allow for less community disruption, less waste placement in landfills and less impact on infrastructure avoiding the need to replace or support bulkheads, bridges and piers. This short course will describe the current state of the practice for ISS in sediments and discuss the methodologies currently used to convert upland ISS approaches for use with sediments. The course will address when ISS should be considered as a potential remedy and the treatability, design and eventual implementation of full-scale ISS in sediments. Designers and contractors with real-world experience in selecting, developing and utilizing this technology will provide input based on actual projects. Case studies of previous and on-going projects will be used to highlight key factors for successfully implementing ISS in sediments and the lessons learned to date.
Draft Agenda: 1. Introduction 2. ISS Basics and History of Technology 3. When to Consider ISS for Sediment Remediation: Ideal Site Attributes 4. Regulatory/Permitting 5. Development of Performance Criteria/Treatability Considerations 6. Design Considerations 7. Construction/Implementation/Equipment Considerations 8. Quality Control 9. Post ISS/Restoration Issues 10. Case Studies and Lessons Learned