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~ ~/~ll- <br />' Western Agas <br />International <br />~.s„o.v. ~.. <br />TITLE <br />CORE LABORATORIES <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 /> <br />1 acceptance criteria. <br /> Method Blanks/ICB & CCB Blanks <br />' <br /> Analyzed value must be s the method detection limit or applicable reporting <br />' limit. <br /> Initial/Continuing Calibration Verification Standards <br />I' The analyzed recovery value must be within 90-110% of the known value. <br />' Duplicate Samples <br /> Where the analyzed value is <_ 5 times the method detection limit, duplicate <br />i , 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 />1 Analyzed values must be within the method-specified QC criteria or within the <br /> laboratory established limits if no method limits are specified. <br /> f <br /> Re <br />erence Standards <br />I <br />' Analyzed value must be within 90-110 percent recovery. <br /> When available, the recovery limits which are specified by tlhe source of the ~ <br />' reference standard (EPA, NBS, etc.) should be used. ~ <br />' ~ 13.5 Calculations <br /> <br />