The DuPont Hay Road "Iron Rich" site is located on the Delaware River in Wilmington at 1200 Hay Road in Wilmington, Delaware. The DuPont Company used the site for sludge drying and disposal of the "Iron Rich" byproduct material from the company's Edge Moor titanium dioxide pigment operations, located nearby. Remedial action activities consisting of the construction of an engineering landfill cap were implemented at the site. The work was performed in accordance to the Final Plan of Remedial Action and the specifications provided in the approved revised Remedial Design Report dated March 12, 2010.
The engineering cap primarily consists of a 10-ounce/square yard geotextile, 40-mil LDPE geomembrane, a geocomposite drainage layer, a 12-inch soil layer and a 6-inch vegetative soil cover on top of the iron rich material. Sediment and erosion control associated with the cap construction was also implemented in accordance with the approved Sediment and Stormwater Management Plan. Remediation work started in 2010 and was completed in 2011. A long-term stewardship plan for post-remediation is in place.
Final Plan of Remediation (FRPA)
The FRPA was approved by Secretary’s Order 2009-A-0005, dated January 16, 2009. The FPRA required construction of the capping system over the staged iron rich material pursuant to the DNREC-approved remedial design plan, placing an environmental covenant prohibiting unrestricted use of the land, and placing restrictions on soil and groundwater and developing an operation and maintenance plan, which includes a groundwater monitoring program.
The related documents may be reviewed as follows:
For more information, please contact Tim Ratsep, Program Administrator, DNREC-SIRS, 391 Lukens Drive, New Castle, Delaware 19720 or phone: 302-395-2600.