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• 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 /> • Duplicates: Duplicated samples are collected "second samples' from a <br /> selected well and project site. They are collected as either split samples <br /> or second-run samples collected from the same well. <br /> • <br /> 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-specific <br /> basis. <br /> µ' 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 Exceltech 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 withdrawn to the surface, and analyzed immediately thereafter.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 vapor <br /> survey contractor will supply sampling, purging, and field chemical analysis to <br /> xceltech in their report. Exce <br /> Eltech considers the vapor probe mapping (together with <br /> to be a reconnaissance technique only. <br /> shallow groundwater sampling) <br /> i <br /> EXCELTECH, INC. <br /> Groundwater Sampling Protocol <br /> Latest Revision: May 3, 1991 <br />