Each sample that is received by NSIL is assigned a laboratory number and a case file is initiated by the sample custodian. The case file will contain all relevant paperwork for that sample including the sample submission sheet, laboratory raw data worksheets, the final results report and any other relevant documentation. The sample custodian enters the client information into the NSIL Sample tracking system (Sample receipt database) and generates appropriate client and sample receipt information. The laboratory analysts perform the appropriate analyses and record the results and whether the results are compliant or non-compliant with the assigned acceptance levels. The analysts also record the record of charges and the analytical and quality assurance units that were used to complete all analysis. The database is used to track samples analyzed by NSIL from sample receipt to reporting of results. It tracks numbers of samples, number of analytical units, types of samples, purpose for sampling ans analytical costs.