American Hill Estates – Nevada County, CA

Holdrege & Kull performed a remedial investigation, including a Human and Ecological Risk Assessment (HERA) and an Engineering Evaluation/Cost Analysis (EE/CA) for two projects within the American Hill Estates Development that was impacted by hard rock gold mining waste and mill tailings. H&K developed a remedial design that included hot spot removal, land use covenants, and operation and maintenance agreements that resulted in a No Further Action determination. In 2014, H&K performed the first five-year review pursuant to the provisions of the O&M agreement.