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fl <br />G <br />G' <br />fl <br />0 <br />11 <br />n <br />fl <br />0 <br />accompany the collected groundwater samples to Eureka Laboratories for <br />analysis. The blanks will consist of de -ionized water sealed in clean <br />containers. The blanks will be analyzed for BTEX (modified EPA Method 602), <br />which is a common field contaminant indicator. <br />5.2.2 Field blanks <br />Field blanks will be collected during the course of groundwater sampling to <br />detect contamination of the groundwater samples during collection. One set <br />of field blanks will be prepared during the groundwater sampling effort. <br />Field blanks will be prepared by filling a cleaned bailer with de -ionized <br />water and pouring the water into appropriate sample containers for analysis. <br />Field blanks will be analyzed for PNAs, BTEX, phenols, CAM metals, cyanides, <br />and sulfides so that the effectiveness of field collection and cleaning <br />techniques can be checked. <br />5.2.3 Duplicate groundwater samples <br />Duplicate groundwater samples will be collected and analyzed to track the <br />consistency in field sampling techniques. The duplicate samples will be <br />collected immediately after the primary sample at the same location, using <br />the same sampling equipment and procedures. In accordance with EPA SW -846, <br />duplicates will be taken for 10% of the groundwater samples obtained. <br />5.2.4 Duplicate soil samples <br />Duplicate soil samples will be collected to check the variability of <br />chemical analytes found in the soil. Duplicates will be collected for 10% <br />of the soil samples analyzed. Because soils are usually not homogeneous in <br />nature, it is difficult to obtain similar analytical results from a <br />duplicate sample unless it originates from the same medium and location as <br />the primary sample. <br />5.3 Sample Identification <br />A numbering system for sample identification and tracking will be used to <br />provide a record of information on each sample and sample suite, and to <br />prevent sample loss or mixup. The sample identification system will be <br />written in a field notebook, with a complete list of samples collected. <br />1 3542a/BAV102 27 <br />