Do you have a favorite “age-old” question? Some people dive deep with “What’s the meaning of life?” while others ask, “What came first, the chicken or the egg?” Remediation practitioners sometimes wrestle with the following:

• Is the plume at my site stable?
• What is the likelihood that my site has a persistent source that will be resistant to further active treatment?
• How can I establish if the performance of an active remedial technology has plateaued?
• What type of contaminant removal rates can I expect after transitioning to monitored natural attenuation (MNA)?

Sound like you? If so, a free, web-based decision-support tool developed under contract to the Department of Defense Strategic Environmental Research and Development Program (SERDP) may be of help (click here). The SERDP Transition Assessment Teaching Assistant (TA²) contains 10 individual modules or tools to evaluate if a specific site is a strong candidate for transitioning to monitored natural attenuation or enhanced attenuation approaches.

Training is available in the form of Microsoft PowerPoint slides (click here) and a webinar (click here). The final report, Transitioning from Active Remedies to Monitored Natural Attenuation, was published this month and is available here.