Remedial Investigation/Feasibility Study (RI/FS)

DHES has substantial experience in the preparation of various RI/FS and related documents such as Preliminary Endangerment Assessment (PEAs) and Environmental Impact Reports (EIRs). Below is a selected summary of relevant experience.

• Prepared numerous RI/FS documents for the Environmental Protection Agency (EPA), California Department of Toxic Substances Control (DTSC), and the Federal Nuclear Regulatory Commission (NRC) associated with landfill citing, mining operations and contaminated sites.
• Prepared Scoping Document for the RI/FS for impacted groundwater beneath a former major manufacturing complex in Riverside County, California, identified the applicable or relevant and appropriate requirements (ARARs) for the site, and identified the data gaps needed to complete the RI/FS.
• Prepared the Sampling & Analysis Plan (SAP) for the California Stringfellow Hazardous Waste Facility in support of a variance for the land disposal of solid groundwater treatment waste containing pesticides.
• Prepared Quality Assurance Project Plans (QAPP), Field Sampling Plans (FSP), and Data Quality Objectives (DOQ) for several Preliminary Endangerment Assessments (PEA) for the Los Angeles Unified School District (LAUSD) sites.
• Prepared technical portions of the Environmental Impact Report (EIR) for the injection of alkaline solutions containing radioactive elements in groundwater aquifers as part of an underground "in-situ" mining process.