Eureka Mills Superfund Site Remediation
From the late 1880s to the 1950s the town of Eureka Mills thrived on the mining industry as the region yielded bountiful lead, silver, zinc and copper. The modern legacy of mining in the Eureka Valley was revealed during soil sampling of residential areas by the Utah DEQ which showed high levels of arsenic and lead long after mining operations ceased. Testing by the Utah Department of Health revealed elevated lead blood levels among Eureka Mills residents, especially children. The Eureka Mills Superfund Site Project is a multi-operable unit remediation project to address heavy metal contamination, resulting from historic mining operations. The remedy included the removal of lead-contaminated soils from virtually every residential and commercial property and the capping of mine waste piles adjacent to residential areas.
HDR prepared HTRW Remedial Design (RD) for the residential remediation through the development of remediation plans for each property affected. During the residential remediation, HDR's community outreach team maintained close coordination with property owners, the city of Eureka, USACE, USEPA R8 stakeholders, and the remediation contractor, which resulted in timely, fiscally responsible and culturally responsive demolition determinations.
HDR led the development of standardized construction details which offered the construction contractor specific methods for cap terminations, utility avoidance and relocation, and other relevant details anticipated during residential cleanup. In all, HDR developed plans for more than 600 privately or commercially owned properties. In addition, HDR provided RD support for revising FEMA flood mapping to reflect completed mine waste remedial action structures through the Letter of Map Revision process and supported cultural resource mitigation through development of plans, specifications, and construction support for stabilization of a historic building in Eureka.
For mine waste activities, HDR reviewed technical submittals, developed record drawings and range of technical resources to assist with EPA enforcement investigations, conducted construction permitting and remedial design during construction, and provided "boots on the ground" to oversee Potentially Responsible Party (PRP) construction efforts.