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Appendix E.1:Data Usability Summary Field Duplicate Groundwater sample SB-37-WD-091111 is a field duplicate of SB-37-W-091111. Acenaphthene was the only target compound detected in either the parent sample or field duplicate. The RPD for the acenaphthene was 0%,because the compound was detected at 0.016 micrograms per liter(µg/L) in both samples. MS/MSDs Project-specific MS/MSD samples were collected with groundwater sample SB-35-W-091110. The %Rs for acenaphthene, acenaphthylene, fluoranthene, fluorene, naphthalene, and phenanthrene were above the laboratory control limits in the MS and MSD. The unspiked sample was non-detect for these compounds, so no data were qualified. The laboratory also randomly selected project samples to prepare MS and/or MSDs for some analytical batches. All randomly selected project samples were within laboratory control limits were one exception. The %R for chloride was 144 percent, above the control limit of 110 percent, in the MS prepared form sample SB-42-W-091116. There was no MSD analyzed. The result for chloride in the sample was qualified E for a potential high bias caused by matrix interference. Internal Standard Area Counts Internal standard area counts were not verified for samples during this data review. However, the laboratory noted that one of the internal standard areas were outside the QC limits for the PAH analysis in sample FosterWell-1-W-091118. The sample was re-analyzed and the internal standard was outside the QC limits again indicating a matrix effect. The results for benzo(b)fluoranthene, benzo(k)fluoranthene,benzo(a)pyrene, indeno(1,2,3-cd)pyrene, dibenz(a,h)anthracene, and benzo(g,h,i)perylene were qualified E as estimated. Representativeness Representativeness was assessed through the evaluation of method blank samples, trip and equipment blank samples, chain-of-custody forms, preservation, and holding times. Method Blank Results Laboratory method blanks were evaluated for any detection above the laboratory MDL. No target analytes were detected in any of the method blanks analyzed as part of this data set with one exception. Benzo(a)pyrene was detected at 0.0035 µg/L in one method blank. The compound was detected at similar concentrations in the associated groundwater samples SB-41- W-091116 and SB-42-W-091116. The samples were re-extracted outside the method hold time and benzo(a)pyrene was not detected. The results in the original analysis were qualified E to indicate they are likely due to contamination introduced during the analysis and not representative of field conditions. Field QC Results Five trip blanks, one field blank, and two equipment rinsate blanks were submitted with the samples. No target analytes were detected in any of the field QC samples, with the following exceptions: • Benzo(a)pyrene, dibenz(a,h)anthracene, and phenanthrene were detected in equipment rinsate blank QA-Tubing-R-091110. The analytes were not detected in any associated groundwater sample SB-35-W-091110. E.1-4 —– =— Frain Science to Solutions