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III. LABORATORY SELECTION <br /> Either state-certified laboratories or those associated with EPA's Contract Lab <br /> Program must be used for sample analyses. If the distance to the nearest laboratory is <br /> such that hand-delivery is not possible, samples should be express/overnight delivered. <br /> All laboratories involved in the analysis of samples must retain their calibration logs for <br /> two years, laboratory data logs for three years, and sampling labels or information from <br /> the labels for three years. All analytical tests must be performed in accordance with <br /> methods acceptable under quality assurance guidelines. A quality assurance plan must <br /> be submitted with the sampling plan. For more information regarding laboratory <br /> selection, see the reference section of this document. <br /> 6 <br />