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ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised March 1998 <br /> Ten percent of the water samples submitted to the laboratory for analysis will be duplicates. <br /> Water sample duplicates will be created by filling two sample bottles from the well bailer. If <br /> more than one bailer volume is required, each bailer volume will be split between containers. <br /> 4.0 SAMPLE PRESERVATION <br /> Sample containers will be pre-cooled and transported to the site in the cooler. All samples will <br /> be preserved as indicated on Table 1 and placed in a cooler immediately after collection. <br /> Chemical ice sealed in plastic bags will be used in the cooler to cool and maintain samples at a <br /> temperature of 4°C. A high-low thermometer will accompany the samples to document transport <br /> conditions. Further discussion of sample preservation is included in the sampling protocols <br /> (Sections 11.0 and 12.0). <br /> 5.0 CHAIN-OF-CUSTODY PROCEDURES <br /> 5.1 Sample Labels <br /> Each sample container will be labeled prior to filling to prevent misidentification. The <br /> label will contain at least the following information: <br /> ✓ sample number which uniquely identifies the sample <br /> ✓ project title or number <br /> ✓ location of sample collection <br /> ✓ soil boring or well number, as applicable <br /> ✓ name of collector <br /> ✓ date and time of collection <br /> ✓ type of analysis requested <br /> W:\Admin\Shells\QAQC-98.DOC <br /> 3 <br />