Report Gives Technical Guidance for In Situ Remedial Reagents

A recently-released technical report by a state-sponsored working group of Los Angeles-area environmental scientists, regulators and remedial contractors provides a detailed guidance document for subsurface injection of in situ remedial reagents (ISRRs) to eliminate groundwater contaminants.

The 46-page document, “Subsurface Injection of In Situ Remedial Reagents (ISRRs) within the Los Angeles Regional Water Quality Control Board Jurisdiction,” is available for download online at

Environmental professionals have had notable successes in the Los Angeles region and elsewhere treating groundwater and soil contaminants with subsurface injections of bioremediation and chemical oxidation reagents, which can destroy many contaminants efficiently, safely, and at a much lower cost compared with conventionally-engineered treatment systems. To minimize any potential environmental, health, or safety impacts from such practices, the ISRR Injection Working Group was convened in 2008 under the auspices of the Los Angeles Regional Water Quality Control Board (LARWQCB) and tasked with identifying specific best practices for the safe and efficient use of subsurface injectables.

The report is intended for use by regulators, consultants, and appliers of ISRR materials, and provides general tools and best practices for the use of injectable remediation materials. Guidance is provided on understanding site hydraulics and other characteristics, delivery methods, application equipment and monitoring methodologies, as well as planning, design and field implementation, including injection volume safety standards for various soil types.

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