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Compliance & Closure, Inc. <br /> Groundwater Sampling Protocol <br /> Latest Revision: March 1998 <br /> can be compared to another. <br /> o Representativeness - a sample or group of samples that reflect the <br /> characteristics of the media at the sampling point . It also <br /> includes how well the sampling point represents the actual <br /> parameter variations which are under study. <br /> Laboratory and field handling procedures of samples are monitored by <br /> including QC samples for analysis with every submitted sample lot from a <br /> project site. QC samples may include any combination of the following. <br /> o Trip Blanks : Used for purgeable organic compounds only; QC <br /> samples are collected in 40 milliliter (ml) sample vials filled in <br /> the analytical laboratory with organic-free water. Trip blanks are <br /> sent to the project site, and travel with project site samples <br /> Trip blanks are not opened, and are returned from a project site <br /> with the project site samples for analysis <br /> o Field Blank• Prepared in the field using organic-free water <br /> These QC samples accompany project site samples to the laboratory <br /> and are analyzed for specific chemical parameters unique to the <br /> project site where they were prepared <br /> o Duplicates • Duplicated samples are collected "secona samples" from <br /> a selected well and project site. They are collected as either <br /> split samples or second-run samples collected from the same well <br /> o Equipment Blank: Periodic QC samples collected from field <br /> equipment rinseate to verify decontamination procedures . <br /> The number and types of QC samples are determined and analyzed on a project- <br /> specific basis . <br /> Shallow Groundwater Survey <br /> A shallow groundwater survey employes reconnaissance field sampling and <br /> chemical analysis for rapid plume mapping. Occasionally, a state-certified <br /> laboratory subcontractor may be used The subcontractor would sample for <br /> analysis at locations marked by the CCI field geologist . The thin-diameter <br /> .probes from which groundwater is collected are advanced to the water bearing <br />