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Attachment B: Data Usability Summary and Laboratory Analytical Results(October 2007) <br /> ualifier Description <br /> E Indicates the reported value is estimated due to associated quality control <br /> (QC)results. <br /> J Indicates the reported value is an estimated concentration detected <br /> between the MDL and LOQ. <br /> A summary of qualified data is provided in Table B-1. Data validation reason codes for all qualified data <br /> are also presented and defined on Table B-1. <br /> Precision and Accuracy <br /> The precision and accuracy of field and laboratory QC samples were evaluated. The calculated relative <br /> percent differences(RPDs)for field duplicate and MS/MSD pairs provided information on the precision <br /> of sampling and analytical procedures, and the RPDs for laboratory control sample/laboratory control <br /> sample duplicate(LCS/LCSD)pairs provided information on the precision of the analytical procedures. <br /> Evaluation of the percent recoveries(%Rs) of MS/MSDs,LCS/LCSDs, and surrogates provided <br /> information on accuracy. <br /> MS/MSDs <br /> Project-specific MS/MSDs were collected with the groundwater samples. All MS/MSD samples were <br /> with QC range,no qualifiers applied. <br /> LCS/LCSDs <br /> A LCS was analyzed with each analytical batch of samples. All LCS/LCSD%Rs were within the <br /> laboratory control limits. <br /> Surrogates <br /> All surrogates were within QC range with the following exceptions: Orthoterphenyl percent recoveries <br /> associated with samples MW-6-071029MS (125 percent) and MW-6071029MSD (115 percent)were <br /> above upper QC and therefore qualified as E. <br /> Representativeness <br /> Representativeness was assessed through the evaluation of the equipment blank sample, chain-of-custody <br /> forms,preservation, and holding times. The reported results were also compared to the laboratory's <br /> MDLs and LOQs. <br /> Method Blank Results <br /> All laboratory method blanks were free of contamination. <br /> Field QC Results <br /> One rinsate blank(QA-R-070806)was submitted with the groundwater field samples. The rinsate blank <br /> was free of contamination with the following exceptions: Naphthalene was detected in rinsate blank QA- <br /> R-071029 at 0.017 micrograms per liter(gg/L). Consequently,the data qualified as E. <br /> Chain-Of-Custody Forms <br /> Sample analytical results were evaluated for agreement with the chain-of-custody form. The evaluation <br /> determined that all samples were received at the lab in the appropriate containers and in good condition <br /> with the chain-of-custody form filled out properly. <br /> Page E.1-2 - - <br /> �mii <br /> MMFrf1`® <br /> From Science[osolullons <br />