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Appendix E.1:Data Usability Summary <br /> • Phenanthrene was detected in equipment rinsate blank QA-Screen-R-091110. The <br /> analyte was not detected in any associated groundwater sample SB-35-W-091110. <br /> • Phenanthrene was detected in the field blank QA-Field_Blank-R-091112. The analyte <br /> was not detected in the associated groundwater sample SB-37-W-091111 or field <br /> duplicate SB-37-WD-091111. <br /> Chain-Of-Custody Forms <br /> Sample analytical results were evaluated for agreement with the chain-of-custody form. Based <br /> on the evaluation, all samples were received at the lab in the appropriate containers and in good <br /> condition with the chain-of-custody form filled out properly. <br /> Preservation and Holding Times <br /> All samples were received at the laboratory within the acceptance temperature criterion of <br /> 4 +2 °C and were analyzed within specified holding times. Sample preservations, when <br /> required by the analysis, were less than the acceptance pH limit of 2. <br /> Reporting Limits <br /> Data reported for this sampling event were reported with the laboratory MDLs for soil samples <br /> and program specified reporting limits for groundwater samples. The MDL represents the lowest <br /> concentration point where an analyte can be positively identified, but the quantitation is an <br /> estimate. The program reporting limits were used to report data below the applicable action <br /> levels. In some cases, the action levels for compounds may be below the analytical capabilities <br /> of the instruments used to determine the concentration of target compounds in environmental <br /> samples. The LOQ is the lowest concentration of an analyte in a sample that the laboratory can <br /> report with precision and accuracy. Analytes that were reported between the MDL and LOQ for <br /> this data set were qualified J as estimates. <br /> Laboratory Fuel Notes for TPHd Analysis <br /> The laboratory noted that the observed chromatogram patterns for TPHd analyses were atypical <br /> for diesel fuel hydrocarbons in groundwater sample SB-42-W-091116 because the pattern eluted <br /> in the carbon range later than diesel fuel. The sample was also silica gel cleaned prior to the <br /> analysis and TPHd was not detected after the silica gel clean-up. This may indicate the TPHd <br /> result is due to peaks that elute in the same carbon range as diesel fuel but are not necessarily <br /> petroleum in nature. <br /> Completeness <br /> Completeness is defined as the number of valid results (i.e., those not rejected) divided by the <br /> total number rejected. Based on this evaluation of the data against the QC objectives,the <br /> percentages of valid data for each method and matrix are 100 percent. <br /> Comparability <br /> Comparability is defined as the confidence with which one data set can be evaluated against <br /> another. Based on the data evaluation, the data are comparable with other laboratory data for <br /> similar samples and sample conditions. The sample collection techniques, EPA test methods, <br /> detection limits, analytical laboratory,units of measure, and sample preparation procedures were <br /> selected to ensure data comparability between sampling events. <br /> E.1-5 - – =— <br /> Frain Science to Solutions <br />