Verdantas (formerly Project Navigator, Ltd.) is the Project Oversight Manager / Coordinator for the 38-acre Waste Disposal Inc. (WDI) Superfund Site located in Santa Fe Springs, CA. Verdantas’ key responsibilities include representing the Responsible Parties (RPs) on all technical and engineering matters, including remedy and scope negotiations with EPA and DTSC. 

The final remedy at WDI was completed in 2006 and consisted of the construction of a 20-acre Resource Conservation and Recovery Act (RCRA) Subtitle C-Equivalent and RCRA Subtitle D Equivalent Covers. The cap was fitted with a passive gas collection system. 

Verdantas staff managed all contractual and in-field construction oversight activities for the responsible party clients. 

Other components of the final remedy consisted of a gas migration control system, liquid monitoring/control system, soil gas monitoring system, groundwater monitoring system and a stormwater monitoring system. Verdantas managed the preparation of the remedy design (plans, specifications and a design report) and conducted a cost evaluation of an evaporative (mono) soil cover vs. a GCL cover for the RCRA C and D areas of the site. The Los Angeles Regional Water Quality Control Board was a participant in remedy selection negotiations. 

Verdantas is also working with the RP Group, EPA, and a developer to redevelop the Site into an e-commerce facility that will further reduce the OM&M cost another 20 percent.