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EPA 542-F-18-002, 15 pp, 2018

The purpose of this issue paper is to describe how in situ treatment technologies might affect sampling and analysis results used to monitor treatment performance as well as to offer best practices to identify and mitigate issues that might affect sampling or analysis. Eight potential sampling or analytical issues associated with groundwater monitoring are described for sites where in situ treatment technologies were applied. These issues are grouped under three topic areas: Issues related to monitoring wells (Section 2); Representativeness of monitoring wells (Section 3); and Post-sampling artifacts (Section 4). https://semspub.epa.gov/src/document/HQ/100001169.

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