Description_x000D_ General description_x000D_ This proficiency testing sample is produced in accordance with ISO/IEC 17043:2010. All information regarding the use of this material can be found in the reporting packet supplied for each sample._x000D_ Preparation Note_x000D_ Randomly contains a minimum 60% of the analytes listed_x000D_ This sample consists of 10g of soil containing base/neutrals and acids in soil. Four samples have been provided for your convenience (multiple methods, multiple analysts, etc.) The soil has been chemically stabilized with 1mL of acetone to minimize degradation of the sample. The evaluation of the results will be based on study statistics as required be NELAC. The standard may not contain all of the compounds listed on the Report Form in accordance with NELAC standards. For analytes not detected, report a zero “0” or a “<” and your detection limit._x000D_ Sample Preparation_x000D_ Extract the complete contents of a single vial._x000D_ Transfer entire contents of one vial to extraction vessel._x000D_ Rinse vial and cap with extraction solvent._x000D_ Note - Sample extracts and calibration solutions should be in the same solvent. Analyze the Extract using the appropriate Semi-Volatile Organics method for which you are seeking accreditation._x000D_ Determine the concentration of the analytes listed, and report your results on the organic analysis data sheet provided. The method used must be reported. If multiple methods are used for preparation and/or analysis, a separate report form must be used for each preparation and analysis method. Report all results on a wet weight basis, do not correct for moisture. Assume a 10g sample size for all calculations._x000D_ Other Notes_x000D_ Proficiency testing samples are presented as single blind. No values for the samples are released until the testing period concludes. Values of analytes vary lot to lot._x000D_ Proficiency Testing Schedule (2020-2021)_x000D_ Soils_x000D_ LPTP20-S1 January 29 - March 13, 2020_x000D_ LPTP20-S2 April 8 - May 22, 2020_x000D_ LPTP20-S3 July 22 - September 4, 2020_x000D_ LPTP20-S4 October 7 - November 20, 2020_x000D_ LPTP21-S1 January 27 - March 12, 2021_x000D_ LPTP21-S2 April 7 - May 21, 2021_x000D_ LPTP21-S3 July 21 - September 3, 2021_x000D_ LPTP21-S4 October 6 - November 19, 2021_x000D_ Quick-Turn Study - (non-scheduled proficiency test that is available at any time)