Laserfiche WebLink
OESC I <br />Molen & Associates, LLC <br />Mark Molen <br />2090 East 104th Avenue Suite #205 <br />Thornton, CO 80223 <br />12065 Lebanon Rd. <br />Mt. Juliet, TN 37122 <br />(615) 758 -5858 <br />1- 800 - 767 -5859 <br />Fax (615) 758 -5859 <br />Tax I.D. 62- 0814289 <br />Est. 1970 <br />Quality Assurance Report <br />Level II <br />L633267 <br />The data package includes a summary of the analytic results of the quality <br />control samples required by the SW -846 or CWA methods. The quality control <br />samples include a method blank, a laboratory control sample, and the matrix <br />spike /matrix spike duplicate analysis. If a target parameter is outside <br />the method limits, every sample that is effected is flagged with the <br />appropriate qualifier in Appendix B of the analytic report. <br />Method Blank - an aliquot of reagent water carried through the <br />entire analytic process. The method blank results indicate if <br />any possible contamination exposure during the sample handling, <br />digestion or extraction process, and analysis. Concentrations of <br />target analytes above the reporting limit in the method blank are <br />qualified with the "B" qualifier. <br />Laboratory Control Sample - is a sample of known concentration <br />that is carried through the digestion /extraction and analysis <br />process. The percent recovery, expressed as a percentage of the <br />theoretical concentration, has statistical control limits <br />indicating that the analytic process is "in control ". If a <br />target analyte is outside the control limits for the laboratory <br />control sample or any other control sample, the parameter is <br />flagged with a "J4" qualifier for all effected samples. <br />Matrix Spike and Matrix Spike Duplicate - is two aliquots of an <br />environmental sample that is spiked with known concentrations of <br />target analytes. The percent recovery of the target analytes <br />also has statistical control limits. If any recoveries that are <br />outside the method control limits, the sample that was selected <br />for matrix spike /matrix spike duplicate analysis is flagged with <br />either a "J5" or a "J611. The relative percent difference ( %RPD) <br />between the matrix spike and the matrix spike duplicate <br />recoveries is all calculated. If the RPD is above the method <br />limit, the effected samples are flagged with a 11J3" qualifier. <br />Page 22 of 22 <br />May 13, 2013 <br />