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<br /> ~,~,. <br /> Western Atles <br />' International <br /> ,c..,. v+e.. <br />CORE LABORATORIES <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />lJ <br /> <br /> <br /> <br />Irir1 F I <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE GATE PAGE <br />HC-QAC-02 0 1 J06J92 66 of 104 <br />13.0 QUALITY CONTROL <br />13.1 Quality Control Terms <br />Field Blanks <br />Field blanks are analyzed to measure and monitor contamination which might <br />have been introduced during bottle preparation, bottle or sample shipment, <br />and during field activities. <br />The contaminant levels in field blanks should be less th$n the repo <br />method detection limit for all analyses. <br />Trio Blanks <br />Trip blanks are sealed bottles or vials which contain labora¢ory pure water <br />which accompany samples during transit, collection, and Storage. <br />Trip blanks measure cumulative contamination derived ffiom la <br />water, sample transit, sample site, and sample storage. <br />Trip blanks are normally provided for all volatile organics analyses at a <br />frequency of one per shipment batch. <br />Site Blanks <br />Site blanks are the same as a trip blank except that the contbiner is opened <br />at the site where the samples are collected. <br />Site blanks measure the same cumulative contamination which a trip blank <br />measures but also includes background site contaminants wPoich would not <br />permeate the bottle seal, <br />Rinsate Blank <br />Rinsate blanks are samples of clean water which were used to rinse field <br />equipment prior to sample collection. <br />