Final Removal Action Workplan for 3512 & 3518 Clayton Road (aka Clayton Road Townhomes Project)

The Ashbury Apartments Interim Removal Action Workplan involves site remediation activities on a 1.81-acre property located at the northwest corner of Ashbury Drive and Amador Avenue in Concord, California. Managed by the City of Concord with oversight from the Department of Toxic Substances Control (DTSC), the project aims to address soil contamination caused by lead and organochlorinated pesticides (OCPs) that exceed residential screening and California hazardous waste levels. The scope of work includes the excavation of approximately 1,000 cubic yards of impacted soil, estimated at 1,500 tons, across four specific areas on the site. Excavation depths are expected to range from two to four feet below the ground surface, and the process will continue until confirmation sampling verifies that cleanup criteria have been met. Following successful remediation, the areas will be backfilled with clean import fill as necessary. The project is scheduled to commence in Fall 2025 and is anticipated to last for a duration of up to six weeks. Under the California Environmental Quality Act (CEQA), the DTSC has issued a Statement of Findings and a Notice of Determination, concluding that the remediation activities will not have significant environmental effects. The workplan requires strict adherence to environmental and noise regulations, dust control measures, and specific procedures for handling any cultural or historical resource discoveries. Key points of contact for the project include Project Manager Karri Peters and Senior Planner Ryan Lenhardt. While the specific contract value is not disclosed, the project is classified under NAICS code 562910 for remediation services.