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Work Plan—PEA Page 13 <br /> Former Haley Flying Service <br /> GPE Project 474.2 <br /> Method Blank: The method blank is used to assess the presence or absence of analytical <br /> target constituents or interferents in the analytical process. <br /> Matrix Spike: An environmental sample to which a known amount of target analyte is added. <br /> The matrix spike provides information about the performance of target analytes in the subject <br /> matrix, and is used to assess accuracy. The spike is the addition of a known amount of analyte <br /> to a normal sample in the lab. <br /> Matrix Spike Duplicate: An exact replicate of the matrix spike. Used to assess precision in <br /> the subject matrix relative to the matrix spike. Especially useful if no target analytes are <br /> present in the subject sample duplicates. Matrix spike duplicates are the second of a pair of <br /> lab matrix spike samples, and are analyzed to check the precision of analytical procedures. <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 <br /> Modesto, Ca 95356 Fax: (209) 569-0295 <br />