Cannot comply with the Remediation Standards or don’t want to excavate 20,000 tons of soil? Depending on the site characteristics there may be a more cost effective solution. Consider applying NJDEP’s Technical Guidance for the Attainment of Remediation Standards and Site-Specific Criteria.
The NJDEP released the Technical Guidance for the Attainment of Remediation Standards and Site-Specific Criteria in September 2012 and held a training session in December on the topic. The guidance presents recommended procedures for achieving compliance with applicable remediation standards, alternative remediation standards, and/or site-specific criteria pursuant to the Department’s Remediation Standards, N.J.A.C. 7:26D. Because it presents alternatives to point by point compliance in some instances it can prevent the need to incur significant remedial costs while ensuring that the remediation is conducted in accordance with the Technical Requirements for Site Remediation, N.J.A.C. 7:26E.
The technical guidance provides several options to achieve compliance with the applicable remediation standards throughout the remediation process (i.e., site investigation, remedial investigation, remedy selection, remedial action), including relatively simple statistical tests and more robust numerical and spatial statistical methods. The following are examples of several compliance options that can be used:
- Arithmetic mean;
- 95% UCL (upper confidence limit of mean); or
- Spatially weighted average (e.g., Thiessen polygons)
- Single point compliance;
In order to determine which option would be used to demonstrate compliance with the NJDEP’s Remediation Standards, the investigator must evaluate the data available and apply professional judgment.
Each averaging statistical option requires a minimum number of samples to be collected, which is dependent on the size of area of concern. Therefore, if you are considering using the NJDEP Technical Guidance for the Attainment of Remediation Standards and Site-Specific Criteria the investigator must collect enough samples to properly conduct the evaluation.