ARCHIVED REPORTS XR0012546 - Laserfiche WebLink

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r� - 1t�Co I Sample DELcri tion See attached Sample Description Information. The samples were received under chain-of-custody. II Analysis Request The following analytical test was requested. Lab ID Anal sis Description 041243-1 thru 3 Aromatic 1'o ati a Organics III Qualitt Control A. Pro ect S ecific OC, No project specific QC (i.e., spikes and/or ,plicates was requested. B. Method Blank Results. A method blank is a laboratory-generated sample w c assesses the degree to which laboratory operations and procedures cause false-positive analytical results for your samples. No target parameters were detected in the method blanks associated with your samples at the reporting limit levels noted on the data sheets in the Analytical Results section. ' - � C. laborator( Control samples. An LCS is a well-characterized matrix enc water, sand or ce ite) which is spiked with certain target parameters and analyzed at approximately o% of the sample load in order to establish method-specific control limits. The LCS results associated with your samples are on the attached Laboratory Control sample Report. Accuracy is measured by Percent Recovery as in: X recovery = mersured concentration x 100 actua concentration Precision is measured using duplicate tests by Relative Percent Difference (RPD) as in: RPD X recover t� est 1 - X recover test 2 x 100 �X recovery test 1 + % recovery test 2)/2 Control limits for accuracy (percent recovery) are based on the average, E historical percent recovery +/-3 standard deviation units. Control limits for precision (relative percent difference) range from 0 (identical duplicate LCS results) to the average, historical relative percent difference + 3 standard deviation units. These control limits are updated on a quarterly basis. ti � .