- Lead-Impacted Fill Remediation
Burns & McDonnell investigated and remediated lead-contaminated fill from residences in the Fredericktown, Mo., area. The lead-impacted fill was originally removed from the shoulders of Highway OO by the Missouri Department of Transportation (MoDOT) and placed in stockpiles at approximately 20 locations in Madison, St. Francois, and St. Genevieve counties, most of which were residential locations. The U.S. Environmental Protection Agency (EPA), under CERCLA, issued an Order on Consent for Removal Action to MoDOT for investigation and removal of the soil.
- Site investigations
- Report preparation
- Construction oversight
MoDOT retained Burns & McDonnell to prepare a work plan, quality assurance project plan (QAPP), and health and safety plan (HASP) in accordance with the terms of the settlement agreement between EPA and MoDOT. In accordance with the approved work plan, Burns & McDonnell conducted soil investigation activities and managed the remediation, removal and disposal of lead-impacted fill.
Burns & McDonnell initially visited each site to inspect the stockpiles and areas where residents had spread the fill within their yards. Burns & McDonnell photographed and mapped each stockpile and placement area using global positioning system (GPS) equipment.
Burns & McDonnell conducted investigation activities following EPA approval of the work plan, QAPP and HASP in accordance with an approved schedule. Soil investigation activities included the sampling the existing intact soil stockpiles and areas where soil stockpiles had been spread by the property owner. Soil samples were analyzed for total lead content through laboratory analysis and field screening using X-ray fluorescence (XRF). Laboratory samples were also analyzed for lead using toxicity characteristic leaching procedure (TCLP). Sampling activities used both direct-push drilling equipment and hand sampling/probing tools.
After gathering and assessing the initial investigation data, Burns & McDonnell prepared a detailed cost estimate for removal action activities. Burns & McDonnell prepared bid documents for removal, including project specifications, construction drawings and bid forms. Burns & McDonnell solicited bids from contractors with experience in lead remediation, reviewed contractor qualifications, tabulated and assessed each bid, and provided recommendations to MoDOT for contractor selection.
Burns & McDonnell managed and supervised all activities related to the removal and remediation of approximately 4,500 cubic yards of lead-impacted fill. A total of 14 of the original 20 sites investigated required either direct removal of non-hazardous lead-impacted fill or treatment followed by removal of hazardous lead-impacted fill. Hazardous lead-impacted fill was treated in-situ through stabilization. The remediation contractor mixed a stabilization agent with the fill to immobilize and/or reduce the solubility of the lead to non-hazardous levels. Once treated, the fill was transported off-site as a non-hazardous waste to its final disposal location.
Upon completion of removal activities at each location, Burns & McDonnell collected confirmation samples within the waste footprint areas to confirm that the waste exceeding remediation objectives had been completely removed. Upon confirmation of removal, each site was restored to as near the original state as practical. Restoration activities included importing and placing backfill at each site, grading each area to match pre-existing grades, and re-seeding or resurfacing each area to match surrounding conditions.