Remedial Design, US Presidio Trust

San Francisco, California

Fill Site 1 and Landfill 2 are two landfill sites located in the southeastern portion of the Presidio that were investigated by the U.S. Army and by the Presidio Trust. Remedial alternatives were evaluated in the Main Installation Sites Feasibility Study (FS) using data collected during Army and Trust investigations. The FS identified excavation and groundwater monitoring as the preferred remedial alternatives for the two sites. Chemicals of concern in the landfills include metals, polyaromatic hydrocarbons, and pesticides. The preferred alternative was documented in a Remedial Action Plan (RAP).

Kennedy/Jenks is providing design services to implement the preferred alternative identified in the RAP. In addition, the design documents must reflect the proposed future land use in the areas, which includes re-establishment of historic forest, creation of a native plant community, and construction of a practice ball field. We are coordinating our design efforts with the Trust’s Forestry, Natural Resources, and Planning departments responsible for this future land development, respectively. We are responsible for preparation of plans, specifications, and cost estimates for excavation, transportation, and disposal of impacted soil, as well as post-soil removal site restoration features.

Project responsibilities included budget scoping and tracking, coordination with various stakeholders and regulatory agencies, work plan preparation, design of soil removal, erosion control, drainage, planting, and irrigation improvements within the area of soil disturbance, coordination and oversight of subconsultants and field personnel, coordination with the contractor and the client, and construction observation of field activities, including air monitoring during soil removal. Approximately 80,000 tons of impacted soil were disposed of at an offsite facility. Notable site restoration features include preservation of historic and natural resources, multi-use trail development, stream restoration to facilitate drainage, a dry stream crossing, and a combined detention basin/wetland. Final design and field implementation are ongoing.