ARCHIVED REPORTS SOIL AND GROUNDWATER INVESTIGATION REPORT

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Appendix D.1:Data Usability Summary were not evaluated for this report. However,the laboratory did use a random project sample from this data set as MS/MSD sample (SB-38-W-070313). In addition,the %Rs and RPDs for the MS/MSD samples were within the required control limits with the following exceptions: background results (initial sample results) were used to calculate the RPD %R for nitrate nitrogen of 5 percent, which is higher than ' the upper control limit of 2 percent, and therefore qualified as E. Also,total phosphorus MS %R of 45 percent was below QC standards and consequently qualified as E. ' LCS/LCSDs A LCS was analyzed with each analytical batch of samples. All LCS/LCSD %Rs were within the laboratory control limits with the following exceptions: the LCS/LCSD RPD %R of 26 percent exceeded the laboratory's QC limit for TPHd with silica gel,and therefore qualified as E. In addition, fluorene (133 percent) and benzo(b)fluoranthene (132 percent)LCS recoveries, and fluoranthene LCS/LCSD percent recoveries (144/133 percent) associated with samples SB-41-W-070312, SB-40-W-070312, ' QA-R-070312, and SB-39-W-070312 were above QC criteria and flagged E for a potential high bias. LCSD%R associated with samples CPL-087-W-01-W-070313 and SB-37-W-070313 was slightly higher for analyte indeno(1,2.3-cd)pyrene(134 percent)than the laboratory's upper QC limit. However, this ' analyte was not detected in any of these samples and therefore did not qualify. Surrogates The laboratory used three surrogates in the analysis of PAHS: nitrobenzene-d5, 2-fluorbiphenyl, and ' terphenyl-dl4. The results of terphenyl-d14 were used to evaluate the extraction and analysis performance for all the target PAH analytes with the exception of dibenz(a,h)anthracene. The recoveries of the surrogate 2-fluorobiphenyl was used to evaluate dibenz(a,h)anthracene. The third surrogate, ' nitrobenzene-d5, is not associated with the target PAHS and was used to evaluate the overall system performance,but was not used to qualify sample results. Data were qualified for the following PAH surrogate recovery: The %R for terphenyl-dl4 was 136 percent in sample SB-38-WD-070313 and consequently qualified as E. In addition, sample SB-39-W-070312 TPHdsg surrogate orthoterphenyl %R of 56 percent was slightly below the QC limits; however,the'fPHdsg produced a non-detect result for this sample, so no qualifiers were assigned. ' Representativeness Representativeness was assessed through the evaluation of method blank samples,trip and equipment blank samples, chain-of-custody forms,preservation, and holding times. The reported results were also ' compared to the laboratory's MDLs and LOQs. Method Blank Results ' Laboratory method blanks were evaluated for detections above the laboratory MDL. If compounds were detected in method blanks and in corresponding sample results within 5 times the concentration detected in the method blank, the sample results were qualified U to indicate the result was likely due to contamination and not representative of field conditions. Data were not qualified if a target compound was detected in the method blank and not detected in a sample result. Naphthalene and phenanthrene were detected in the method blank associated with groundwater sample ' SB-37-W-070313 at 0.0044 micrograms per liter(µg/L) and 0.0051 µg/L, respectively. Naphthalene (0.042 µg/L) and phenanthrene(0.011 Itg/L) were detected in this sample. These results were qualified U as non-detect to indicate the detections are likely due to introduced contamination and not representative ' of field conditions. Field QC Results ' Two equipment blanks and three trip blanks were submitted with the field samples. The equipment rinsate and trip blanks were free of contamination, with the following exceptions: sample QA-R-070313 had detected concentrations of phenanthrene(0.013 µg/L), anthracene (0.011 gg/L), fluoranthene ' Page D.1-3 SAI+ ® From Science to Solutions 1