Laserfiche WebLink
STL Sacramento <br />Quality Control Definitions <br />i"-"� .i.:� �"�.. ��a�]](], O _ mSr-+�y�f` <br />."!t''F Sl�i�t-4!�ciS'�� �9_;� � �9,N�'�'�3h4�'�� t�:!'�.{�.•iui�: <br />�i5 •.-' <br />A set of up to 20 field samples plus associated laboratory QC <br />QC Batc <br />samples that are similar in composition (matrix) and that are <br />processed within the same time period with the same reagent and <br />standard lots. <br />Consist of a pair of LCSs analyzed within the same QC batch to <br />Duplicate Control <br />Sample <br />monitor precision and accuracy independent of sample matrix <br />(DCS) <br />effects. This QC is performed only if required by client or when <br />insufficient sample is available to perform MS/MSD. <br />A second aliquot of an environmental sample, taken from the same <br />sample container when possible, that is processed independently <br />with the first sample aliquot. The results are used to assess the <br />Duplicate Sampl <br />(DLJ) <br />effect of the sample matrix on the precision of the analytical <br />process. The precision estimated using this sample is not <br />necessarily representative of the precision for other samples in the <br />batch. <br />A volume of reagent water for aqueous samples or a contaminant - <br />free solid matrix (Ottawa sand) for soil and sediment samples <br />Laboratory Control ample <br />which is spiked with known amounts of representative target <br />(LCS) <br />and required surrogates. An LCS is carried through the <br />entire <br />entire analytical process and is used to monitor the accuracy of the <br />analytical process independent of potential matrix effects. <br />A field sample fortified with known quantities of target analytes <br />that are also added to the LCS. Matrix spike duplicate is a second <br />Matrix Spike and Mat#ix Spike <br />matrix spike sample. MSs/MSDs are carried through the entire <br />Duplicate (MS/M§D) <br />analytical process and are used to determine sample matrix effect <br />on accuracy of the measurement system. The accuracy and <br />precision estimated using MS/MSD is only representative of the <br />recision of the sample that was spiked. <br />A sample composed of all the reagents (in the same quantities) in <br />Method Blank (MB) <br />reagent water carried through the entire analytical process. The <br />method blank is used to monitor the level of contamination <br />introduced during sample preparation steps. <br />Organic constituents not expected to be detected in environmental <br />media and are added to every sample and QC at a known <br />11 Surrogate Spiky <br />concentration. Surrogates are used to determine the efficiency of <br />the sample preparation and the analytical process. <br />Source: STL Sacramento Laboratory Quality Manual <br />STL Sacramento Certif <br />Alaska (UST -055), Arizc <br />Connecticut (#PH -0691), <br />Nevada (#CA 044), New <br />(LAB ID 87014, Cert. # i <br />9930C), Wisconsin (Lab <br />Foreign Soil (Permit # S- <br />(#AZ00616), Arkansas, California (NELAP # 01119CA) (ELAP #I-2439), <br />)rida (E87570), Hawaii, Louisiana (AI # 30612), New Jersey (Lab ID 44005), <br />rk (LAB ID 11666 serial # 107407), Oregon (LAB ID CA 044), South Carolina <br />140), Utah (E-168), Virginia (#00178), Washington (# C087), West Virginia (# <br />204680), USNAVY, USACE, USDA Foreign Plant (Permit # 37-82605), USDA <br />i13).. <br />G3D050174 I STL - Sacramento (916) 373 - 5600 2 of 35 <br />