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Chapman Ross
Chapman Ross

Director of Technology
FRx, Inc.

Chapman Ross is the Director of Technology for FRx and a professional environmental engineer in Massachusetts. He has 20 years of domestic and international remediation experience and a proven track record of technical leadership and new technology development. Chapman is also a contributor and an instructor for the ITRC’s Optimizing In Situ Remediation Performance & Injection Strategies team.


DPT Jet Injection for Remediation of Low-Permeability Zones: Three Full-Scale Case Studies in Three States

Direct-Push Technology Jet Injection (DPT-JI) is an amendment delivery method that was developed to overcome the challenges of treating chlorinated solvents in low-permeability formations. This patented injection method combines high pressure jetting (10,000 psi) and controlled hydraulic fracturing for delivery of amendments into geologic matrices where remediation is limited by contact between reagents and solvents trapped in the matrix. Here we present the results of three full-scale DPT-JI case studies which have utilized zero-valent iron (ZVI) for treatment of chlorinated solvents in low-permeability zones at sites located in New England, North Carolina, and Texas. These three sites are impacted with chlorinated solvents at concentrations ranging from 3,000 ug/L to 930,000 ug/L. Results showing greater than 90% destruction in groundwater from all three sites will be presented to demonstrate that ZVI delivered using DPT-JI can successfully treat chlorinated solvent source zones in the most challenging low-permeability formations.

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