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CORE LABOFkATORiES <br />~ O/i/~ <br />i' Western Atlaa <br />Inter ~ational <br />,o.... ~.o.. <br />i r, T ~ c <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1/06!92 6T of 104 <br />' Rinsate blanks measure the cumulative contamination frpm 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 whhich were used to <br />rinse field equipment after or between field sample coll$ction 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 contamination <br />' introduced during laboratory storage, sample preparation, and analysis. <br />The contaminant levels in laboratory blanks should be Less than the reported <br />method detection limit for all analytes. <br />Storage Blanks <br />Storage blanks are samples of laboratory pure water whidh is stored in the <br />same type of sample containers and in the same storaige 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.i <br />Instrument Blanks <br />Instrument blanks are laboratory pure water samples which are analyzed ati <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 />1 <br />