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Attachment C:Data Usability Summary and Laboratory Analytical Reports <br /> Similar results were obtained in both analyses; therefore, the original data were reported and no <br /> data were qualified. <br /> Field Duplicate <br /> Groundwater sample MW-10-WD-W-100105 is afield duplicate of MW-10-W-100105. No <br /> ' target analytes were detected in the field sample. The analytes 1-methylnaphthalene and <br /> 2-methylnaphthalene were detected in the field duplicate. The results were qualified E because <br /> they were not confirmed in the field sample. <br /> ' MS/MSDs <br /> One project-specific MS/MSD sample was collected with groundwater sample MW-12-W- <br /> 100105. The %Rs for the target analytes were within the laboratory control limits with two <br /> exceptions: the %Rs for 2-methylnaphthalene were below the laboratory control limits in the MS <br /> and MSD. However, the MS and MSD control limits are advisory because the laboratory has not <br /> ' generated the required number of data points to construct a statistical control chart. Therefore, <br /> no data were qualified because the %Rs were within the control limit ranges of other analytes <br /> analyzed by this method. <br /> ' Due to a laboratory error,the project-specific MS/MSD was not spiked for TPHd as requested. <br /> The laboratory re-extracted the MS and MSD, and the %Rs were within the required control <br /> limits. No data were qualified. <br /> REPRESENTATIVENESS <br /> Representativeness was assessed through the evaluation of method blank samples, trip and <br /> equipment blank samples, chain-of-custody forms,preservation, and holding times. <br /> Method Blank Results <br /> ' Laboratory method blanks were evaluated for any detection above the laboratory MDL. No <br /> target analytes were detected in any of the method blanks analyzed as part of this data set with <br /> one exception: TPHd were detected at 60 micrograms per liter{pg/L} in one method blank. <br /> ' TPHd were detected in the associated field sample MW-11-W-100105 at 934g/L. The result was <br /> qualified E because the concentration was within 10 times the concentration detected in the <br /> method blank. <br /> ' Field QC Results <br /> One equipment rinsate blank, QA-Tubing-R-100105, was submitted with the samples. No target <br /> ' analytes were detected in the field QC sample with one exception. 1-mehtylnaphthalene was <br /> detected at 0.0057µg/L. The analyte was detected in two associated samples, MW-10-WD-W- <br /> 100105 and MW-11-W-100105, within similar concentrations. The results were qualified E to <br /> ' indicate a potential bias from contamination. <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 laboratory in the appropriate containers and in <br /> good condition with the chain-of-custody form filled out properly. <br /> ' C-3 <br />