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Quality Assurance/Ouality Control <br /> The sampling and analysis procedures employed by ERI for groundwater monitoring and sampling <br /> follow regulatory guidance documents for quality assurance/quality control (QA/QC). Quality control is <br /> maintained by site-specific field protocols and quality control checks performed by the laboratory. <br /> Laboratory and field handling of samples may be monitored by including QC samples for analysis. QC <br /> samples may include any combination of the following. The number and types of QC samples are <br /> selected and analyzed on a project-specific basis. <br /> Trip Blanks -Trip blanks are sent to the project site, and travel with samples collected from the project <br /> site to the laboratory. They are not opened, and are returned from the project site with the samples for <br /> analysis. <br /> Field Blank - Prepared in the field using organic-free water. Field blanks accompany samples collected <br /> at the project site to the laboratory and are analyzed periodically for specific chemical compounds <br /> present at the project site where they were prepared. <br /> Duplicates - Duplicate samples are collected from a selected well and project site. They are analyzed at <br /> two different laboratories, or at the same laboratory under different labels. <br /> Equipment Blank - Periodic QC samples are collected from field equipment rinsate to verify adequate <br /> cleaning procedures. <br />