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~ %/1- <br />Westam AUas <br />International <br />~' IYITIE <br />i <br />1 <br />1 <br />CORE LABORATORIES <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. <br />HC-QAC-02 <br />0 <br />NOTE: Certain methods iespecially 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/ICS & 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 90-1 10% of the known value. <br />Duplicate 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 />Analyzed values must be within the method-specified QC criteria or within the <br />laboratory established limits if no method limits are specified. <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 />13.5 Calculations <br />REVISION NO. (EFFECTIVE DATE (PAGE <br />