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March 7, 2019 | Page B-2 File No. 0504-119-01 <br />CHEMICAL ANALYSIS PERFORMED <br />TestAmerica Laboratories, Inc. (TestAmerica), located in Spokane Valley, Washington, performed laboratory <br />analyses on the samples using one or more of the following methods: <br />■ Gasoline-Range Hydrocarbons (NWTPH-Gx) by Method NWTPH-Gx; and <br />■ Volatile Organic Compounds (VOCs) by Method EPA 8260C <br />DATA VALIDATION SUMMARY <br />The results for each of the QC elements are summarized below. <br />Data Package Completeness <br />TestAmerica provided the required deliverables for the data validation according to the National Functional <br />Guidelines. The laboratory followed adequate corrective action processes and the identified anomalies <br />were discussed in the relevant laboratory case narrative. <br />Chain-of-Custody Documentation <br />Chain-of-custody (COC) forms were provided with the laboratory analytical reports. The COCs were accurate <br />and complete when submitted to the laboratory. <br />Holding Times and Sample Preservation <br />The sample holding time is defined as the time that elapses between sample collection and sample <br />analysis. Maximum holding time criteria exist for each analysis to help ensure that the analyte <br />concentrations found at the time of analysis reflect the concentration present at the time of sample <br />collection. Established holding times were met for each analysis. The sample cooler arrived at the laboratory <br />within the appropriate temperatures of between 2 and 6 degrees Celsius. <br />Surrogate Recoveries <br />A surrogate compound is a compound that is chemically similar to the organic analytes of interest, but <br />unlikely to be found in an environmental sample. Surrogates are used for organic analyses and are added <br />to the samples, standards and blanks to serve as an accuracy and specificity check of each analysis. <br />The surrogates are added to the samples at a known concentration and percent recoveries are calculated <br />following analysis. The surrogate percent recoveries for field samples were within the laboratory control <br />limits. <br />Method and Trip Blanks <br />Method Blanks <br />Method blanks are analyzed to ensure that laboratory procedures and reagents do not introduce <br />measurable concentrations of the analytes of interest. A method blank was analyzed with each batch of <br />samples, at a frequency of 1 per 20 samples. For each sample batch, method blanks for the applicable <br />methods were analyzed at the required frequency. None of the analytes of interest were detected in the <br />method blanks.