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' 'CORE LABORATORIES <br />~ ~/~/~ <br />Western Atlas <br />Intersationat <br />rir~E <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE: MANUAL <br />' SOP NO. REVISION N0. EFFECTIVE OATS PAGH <br />HC-QAC-02 0 1106192 81 of 104 <br />' <br /> For field sample analysis, semivolatile parameters are allowed one surrogate <br />' per fraction which does not meet specifications {i.e., one acid andior one <br />base/neutral surrogate! as long as all surrogates have measured recoveries of <br /> > 10%. For semivolatile blank analysis, aII surrogates must meet the <br /> method-specified recovery limits. All volatile organics, pesticide/PCBs, and <br />' herbicide analysis surrogates must meet the method-specified recovery limits. <br /> Extraction/Method Duplicates <br /> At a minimum, extraction duplicates must be analyzed at a frequency of 5% <br /> of the sample population (i,e., 1-20 samples, 1 duplicate; 20-40 samples, 2 <br />' duplicates, etc.). Analytical parameters which do not remuire extraction <br /> (VOA, THM, etc.) should have duplicates analyzed once per $nalytical batch <br /> or at a frequency of 10°!0 of the sample population, whichever is greater. <br />' Matrix spike duplicates may be used in place of sample duplicates. <br />' Matrix Spikes <br /> At a minimum, matrix spikes must be analyzed at a frequency of 5% of the <br /> sample population (i.e., 1-20 samples, 1 spike; 20-40 samples, 2 spikes,etc.l. <br /> Preferably, matrix spikes will be analyzed once per analytical batch if sample <br /> volumes permit. <br />' <br /> Reference Standards <br /> At a minimum, reference standards (EPA, NBS, etc.) must be analyzed each <br /> time an initial calibration is performed in order to verify proper instrument <br />' calibration. Preferably, reference standards will be analyzed weekly. <br />Reference standards must be from a source other than that wriich was used <br /> for the calibration standards. <br />' Laboratory Control Standards <br />' At a minimum, laboratory control standards must be analyzed a¢ a frequency <br /> of 5% of the sample population (i.e., 1-20 samples, 1 LCS; 20.40 samples, <br /> 2 LCS,etc.l• Preferably, laboratory control standards will be ahalyzed once <br /> per analytical batch. <br />i 13.4 General Quality Control Acceptance Criteria <br />