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Laboratory and field handling procedures of samples are monitored by including QC <br /> samples for analysis with every submitted sample lot from a project site. QC samples <br /> may include any combination of the following- <br /> Trip Blanks: Used for purgeable organic compounds only, QC <br /> samples are collected in 40 milliliter (ml) sample vials filled in the <br /> analytical laboratory with organic-free water Trip blanks are sent to <br /> the project site, and travel with project site samples. Trip blanks are <br />' not opened, and are returned from a project site with the project site <br /> samples for analysis. <br /> • Field Blank: Prepared in the field using organic-free water. These <br />' QC samples accompany project site samples to the laboratory and are <br /> analyzed for specific chemical parameters unique to the project site <br /> where they were prepared <br />' <br /> Duplicates: Duplicated samples are collected "second samples" from a <br /> P P P P <br /> selected well and project site They are collected as either split samples <br /> or second-run samples collected from the same well. <br /> • Equipment Blank: Periodic QC samples collected from field <br /> equipment nnseate to verify decontamination procedures <br /> ' The number and types of QC samples are determined and analyzed on a project-specific <br /> basis <br /> Shallow Groundwater Survey <br /> A shallow groundwater survey employs reconnaissance field sampling and chemical <br /> ' analysis for rapid plume mapping Occasionally, a state-certified laboratory <br /> subcontractor may be used. The subcontractor would sample for analysis at locations <br /> marked by the RESNA field geologist. The thin-diameter probes from which <br /> groundwater is collected are advanced to the water bearing stratum, sample is <br /> withdrawn to the surface, and analyzed immediately thereafter. Probe holes are <br /> backfilled with a grout slurry or as the local permitting agency requires. The shallow <br /> survey contractor will supply sampling, purging, and field chemical analysis to RESNA <br /> in their report RESNA considers this type of shallow probe mapping (together with <br /> shallow groundwater sampling) to be a reconnaissance technique only. <br /> RESNA INDUSTRIES, INC <br /> Groundwater Sampling Protocol <br /> ' Latest Revision October 23, 1991 <br />