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CRA MEMORANDUM Page 3 <br /> Matrix spikes (MS) were prepared and analyzed in duplicate for VOCs. All recoveries were within <br /> required control limits showing adequate analytical accuracy and precision. Precision for DRO was <br /> determined to be acceptable based on LCS/LCSD recoveries. <br /> FIELD QUALITY ASSURANCE/QUALITY CONTROL (QA/QC) <br /> The field QA/QC consisted of a field duplicate sample set and trip blanks. <br /> Overall precision for the sampling event and laboratory procedures was monitored using the results of the <br /> field duplicate sample sets. The RPDs associated with these duplicate samples must be less than 50 percent <br /> for water or 100 percent for soil/sediment. If the reported concentration in either the investigative sample <br /> or its duplicate is less than five times the RL,the evaluation criteria are; one times the RL value for water or <br /> two times for soil/sediment. <br /> All field duplicate results were acceptable indicating good field and analytical precision. <br /> To monitor potential cross-contamination of VOCs during sample transportation and storage, trip blanks <br /> were submitted to the laboratory for VOC analysis. <br /> All trip blank results were non-detect for the compounds of interest. <br /> OVERALL ASSESSMENT <br /> The data were found to exhibit acceptable levels of accuracy and precision,based on the provided <br /> information, and may be used without qualification. <br />