RENOVA was initially contacted to remediate a site via traditional excavation with off-site disposal and provided a value engineering alternative for in-situ soil solidification/stabilization (ISS). The environmental engineering firm and their developer client realized the efficiencies and cost savings from ISS and selected RENOVA as the prime contractor. RENOVA initially completed an ISS treatability study and the results identified an effective mix of Portland cement and slag to achieve the quality control benchmarks for unconfined strength and hydraulic conductivity.

The remedial action operation included 3,200CY of soil impacted with petroleum, PCBs, lead, arsenic, and benzene and extended up to 10′ below grade. RENOVA segmented the remediation area into 20 “cells” to be individually treated. To ensure complete mixing, horizontally adjacent cells overlapped with previously treated cells and were mixed to the prescribed ISS depth.

RENOVA mobilized an in-house automated batch plant, heavy machinery, and experienced personnel to the project site in March 2023. In addition, RENOVA procured BioSolve PinkWater®, an odor suppressant foam to be applied during cell mixing activities. Before mixing commenced, the slurry slag volume for each treatment cell was calculated based on the surface area, depth, and overlapped portions of each cell. Excavators mixed each cell using the predetermined Portland-slag slurry over the entire volume of the cell. RENOVA provided savings to the client by addressing debris in the treated area with the excavator, avoiding costly off-site disposal. Following cell mixing, RENOVA collected quality samples of the mixed soils to be tested by an off-site laboratory. Once all test results were complete, RENOVA verified that all quality control parameters were achieved and that treated cells did not require remixing. RENOVA safely and effectively completed ISS treatment of soil with zero safety incidents resulting in lost time.