Can I use real-time measurements and field data to support CERCLA risk assessments? How?
Because of the significance of CERCLA risk assessments for site decision-making, data must be of sufficient quality to meet risk assessment needs. From an analytical perspective, this means that detection limits should be below levels that would be of concern, that the method has sufficient specificity and selectivity to provide results for the contaminants of concern, that sampling is representative of the exposure unit under consideration, and that QA/QC protocols are sufficient to support analytical quality. These requirements are usually met by using standard fixed-laboratory methods. However, in many cases the same instrumentation that is used at the fixed laboratory can be used in or near the field (e.g., a mobile laboratory) to support dynamic work strategies. In these situations, with the proper QA/QC protocols, data produced by these methods may be as good as or better than what a fixed laboratory would produce. In other cases, the measurement techniques used to produce real-t
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