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Data Usability Summary Surrogates All surrogates were within the required control limits with the following exceptions. The%R for 2-fluorobiphenyl, one of the surrogates used in the analysis for PAHs by SW8270C-SIM,was 117 percent in sample WFSMW-I-W-060816,which exceeds the upper control limit of 115 percent. This surrogate is used for the evaluation of dibenz(a,h)anthracene. Dibenz(a,h)anthracene was not detected in the sample, and no data were qualified. The%R of 2-fluorobiphenyl was 125 percent, also higher than the required control limit in the method blank. However, all other surrogates in the samples were within the required control limits so no data were qualified. The surrogate orthoterphenyl used in the analysis of TPHd was high in the MSD sample prepared from sample WFSMW-I-W-060816. No data were qualified because the MSD was used for quality control purposes and the spike recoveries were in control. Representativeness Representativeness was assessed through the evaluation of method blank samples,trip blank samples, equipment blank samples, chain-of-custody forms,preservation, and holding times. Method Blank Results TPHd were detected at 36 micrograms per liter(gg/L)in the method blank associated with these samples. TPHd were detected in two associated samples,WFSMW-I-W-060816 at 230 µg/L and its' field duplicate WFSMW-I-WD-060816 at 120gg/L. Sample results that are within 5 times the concentration of target analytes detected in method blanks are normally qualified"U"as non-detect to indicate the detections are not representative of field conditions. In this case,the TPHd result in the field duplicate sample was not qualified because the sample result was used for comparison to the parent sample. All other laboratory method blanks were free of contamination. Field QC Results One equipment rinsate blank and one trip blank were submitted with the samples. Phenanthrene was detected in the equipment rinsate sample QA-R-060816 at 0.011 µg/L. Phenanthrene was detected at 0.013 gg/L in sample WFSMW-I-W-060816 and field duplicate WFSMW-I-WD-060816. The presence of phenanthrene in the equipment rinsate and associated samples may indicate that the decontamination procedure was not adequately performed on August 16,2006. However, since the compound was detected at the same concentration in both the sample and field duplicate, and not detected in sample MW-5-W-060816 collected on the same day, it is not likely that contamination occurred. Phenanthrene in the equipment rinsate blank and associated samples were flagged"J' because the concentrations were between the laboratory MDLs and LOQs. Chain-Of-Custody Forms Sample analytical results were evaluated for agreement with the chain-of-custody form. Based on the evaluation, all samples were received at the lab in the appropriate containers and in good condition with the chain-of-custody form filled out properly. Preservation and Holding Times Samples were preserved in the field as appropriate,were received at the laboratory within the acceptance temperature criterion of 4+2 °C,and were prepared and analyzed within specified holding times. The sample preservations,when required by the analysis,were less than the acceptance pH limit of 2. Reporting Limits Data reported for this sampling event were reported with the laboratory MDLs. The MDL represents the lowest concentration point where an analyte can be positively identified,but the quantitation is an estimate. The LOQ is the lowest concentration of an analyte in a sample that the laboratory can report with precision and accuracy. Analytes that were reported between the MDL and LOQ for this data set were qualified"J"as estimates.