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1 <br />1 <br />1 <br />1 <br />1 <br />•,~,. <br />Western Atlas <br />International <br />o..,. ce.... <br />CORE LABORiQTORIES <br />r ~ c <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. AE VISION N0. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1!06!92 67 of 104 <br />Rinsate blanks measure the cumulative contamination from the rinse water, <br />field sampling equipment, the sample site, sample transit, and sample <br />storage. <br />Decontamination Blank <br />Decontamination blanks are samples of clean water which were used <br />rinse field equipment after or between field sample collection sites. <br />Decontamination blanks measure the cumulative contamination from the <br />rinse water, field sampling equipment, equipment contamination, the <br />sample site, sample transit, and sample storage. <br />Laboratorv Blanks <br />Laboratory blanks are analyzed to measure and monitor contaminatio <br />introduced during laboratory storage, sample preparation, and analysis. <br />The contaminant levels in laboratory blanks should be less than the reporte <br />method detection limit for all analytes. <br />Storage Blanks <br />Storage blanks are samples of laboratory pure water which is stored in the <br />same type of sample containers and in the same storag¢ units as field <br />samples. <br />Storage blanks are prepared, stored for one month, and then analyzed to <br />monitor volatile organics contamination derived from sample storage units. <br />Instrument Blanks <br />Instrument blanks are laboratory pure water samples which are analyzed at <br />the beginning of an analytical run. <br />Instrument blanks measure instrument contamination and indicate if <br />corrective action is needed prior to proceeding with sample analysis. <br />