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Attachment B: Data Usability Summary <br /> between the method detection limit(MDL)and limit of quantitation <br /> (LOQ). <br /> R Indicates the result is rejected because of deficiencies in the ability to <br /> meet QC criteria and cannot be used for decision making. <br /> ND Indicates the constituent was analyzed for,but not detected above the <br /> level of the associated value. <br /> A summary of qualified data is provided in Table B-1. Data validation reason codes for all qualified data <br /> with the associated reasons for qualification 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 relative percent <br /> differences(RPDs)for laboratory control sample samples and laboratory control sample duplicates <br /> (LCS/LCSDs)provided information on the precision of the analytical procedures. Evaluation of the <br /> percent recoveries(%Rs) of LCS/LCSDs,and surrogates provided information on accuracy. Project- <br /> specific matrix spike/matrix spike duplicate(MS/MSD) samples were collected for this data set. All <br /> LCS/LCSD%Rs,LCS/LCSD RPDs, and surrogate%Rs were within the required laboratory control <br /> limits. <br /> Representativeness <br /> Representativeness was assessed through the evaluation of method blank samples, equipment rinsate <br /> blank sample, chain-of-custody forms,preservation, and holding times. <br /> Field Duplicate Samples <br /> Field duplicate samples pairs MW-3-WD-080129 and MW-3-W-080129 were within the QC criteria for <br /> relative percent difference for all analytes with the following exceptions: acenaphthylene,phenanthrene, <br /> anthracene,benzo(a)anthracene,benzo(k) fluoranthene,benzo(g,h,i)perylene,benzo(a)pyrene. Results <br /> will be flagged with E. <br /> Surrogates <br /> All surrogates were within QC range with the following exceptions: orthoterphenyl percent recoveries <br /> associated with sample MW-3-W-080129 were above upper QC and therefore qualified as E. <br /> Matrix SpikelMlatrix Spike Duplicate(MS/MSD) <br /> The MS/MSD analyzed in this batch was not from this sample set therefore not included in the <br /> evaluation. <br /> Method Blank Results <br /> All laboratory method blanks were free of contamination. <br /> Chain-Of-Custody Forms <br /> Sample analytical results were evaluated for agreement with the chain-of-custody form. The evaluation <br /> indicated 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 /> Preservation and Holding Times <br /> Samples were preserved in the field as appropriate,were received at the laboratory within the acceptance <br /> temperature criterion of 4+2 °C, and were prepared and analyzed within specified holding times. The <br /> sample preservations,when required by the analysis,were less than the acceptance pH limit of 2. <br /> Reporting Limits <br /> Data reported for this sampling event were reported with the laboratory MDLs. The MDL represents the <br /> lowest concentration point where an analyte can be positively identified,but the quantitation is an <br />