ARCHIVED REPORTS_SITE INVESTIGATION AND WELL DESTRUCTION PERMIT

Home Browse Search

CRA MEMORANDUM Page 5 10.0 Matrix Spike/Matrix Spike Duplicate (MS/MSD) Analyses To evaluate the effects of sample matrices on the extraction or digestion process, measurement procedures, and accuracy of a particular analysis, samples are spiked with a known concentration of the analyte of concern and analyzed as MS/MSD samples. The relative percent difference (RPD) between the MS and MSD is used to assess analytical precision. If the original sample concentration is significantly greater than the spike concentration,the recovery is not assessed. The MS/MSD samples were spiked with all compounds of interest. All percent recoveries and RPD values were within the laboratory control limits, demonstrating acceptable analytical accuracy and precision. 11.0 Field QA/QC Samples The field QA/QC consisted of one trip blank sample, one field blank sample, one equipment blank sample and one field duplicate set. Trip Blank Sample Analysis To evaluate contamination from sample collection, transportation, storage, and analytical activities, the trip blank was submitted to the laboratory for VOC analysis. All results were non-detect for the compounds of interest. Field/Equipment Blank Sample Analysis To assess field decontamination procedures, ambient conditions at the site, and cleanliness of sample containers, the field and equipment blanks were submitted for analysis, as identified in Table 1. All results were non-detect for the analytes of interest. 12.0 Target Compound Identification To minimize erroneous compound identification during organic analyses, qualitative criteria including compound retention time and mass spectra, if applicable, were evaluated according to the identification criteria established by the methods. 13.0 Conclusion Based on the assessment detailed in the foregoing, the data summarized are acceptable without qualification. EQUM EMPLOYMENT OWOMNM EMPLO k