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CORE LABORATORIES <br />~ ~/r%, <br />Western Atlas <br />International <br />%w v+.. <br />TirtE <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE GATE PAGE <br />HC-QAC-02 0 1!06/92 82 of 104 <br /> <br /> NOTE: Certain methods (especially organics analysis) have method-specified <br /> quality control acceptance criteria, The following acceptance criteria <br />' limits are guidelines which are applicable for the majority of <br /> parameters performed. Refer to the specific method for appropriate <br />' acceptance criteria. <br /> Method Blanks/1C6 & CCB Blanks <br /> Analyzed value must be < the method detection limit or applicable reporting <br /> limit. <br /> Initial/Continuing Calibration Verification Standards <br /> The analyzed recovery value must be within 90-110% of the known value. <br /> D I~olicate Samples <br /> Where the analyzed value is <_ 5 times the method detection limit, duplicate <br /> values must agree within t the detection limit. <br /> Where the analyzed value is > 5 times the method detection limit, duplicate <br /> value must agree within <_ 20 relative percent difference. <br /> Spike Samples <br />' <br /> Analyzed values must be within the method-specified QC criteria or within the <br /> laboratory established limits if no method limits are specified. <br /> <br /> Reference Standards <br /> Analyzed value must be within 90-110 percent recovery. <br /> When available, the recovery limits which are specified by the source of the <br />' reference standard (EPA, NBS, etc.) should be used. <br />' <br /> 13.5 Calculations <br />