A large aerospace company owned a manufacturing facility in Southern California and decided to demolish the facility, clean up all waste, sell the property and relocate to another state. Extensive hazardous waste remediation would be required for this site in California.
Steve won the opportunity to prepare a design-build cleanup bid to remove 70,000 cubic yards of oil-and-solvent-contaminated soil, some of which extended to 130 feet below ground surface, and fill in the excavation with clean soils. The bid requirements for this hazardous waste remediation project called for clean closure of the property with no deed restrictions need be obtained from regulatory agencies.
EXPERT HAZARDOUS WASTE REMEDIATION SERVICES
As this was a design-build contract, Steve needed to prepare a work plan, health and safety plan, sampling and testing plan as well as a construction bid for the hazardous waste remediation. After those documents were approved, excavation, trucking and disposal work began, for which he was the project manager.
Using the approach developed by Steve, excavation of the hazardous waste began using conventional excavators to a depth of about 30 feet. From 30-130 feet, auger excavation was performed with a 6-foot diameter bucket where periodic soil samples were taken until no contaminated residue was detected in that hole.
After the hole tested clean, a sand/cement slurry was pumped into the augered hole and augering operations moved to a nearby — but not adjacent hole. Then the process repeated. Once the slurry had set, the adjacent holes were excavated with that auger and then filled with the slurry until all oil and solvent contaminated soil was removed from what had been a hazardous waste site.
After the excavation of the soil contaminated by oil and solvents was completed, the hole was backfilled with soil that was tested to assure it was clean and free from chemical contamination. Compaction testing was then performed to confirm the site was stable for re-use.
With hazardous waste remediation of the California site successfully completed, clean closure was granted and the property was purchased for use by a developer.