Laserfiche WebLink
I <br /> 1 <br /> i <br /> SECTION VII <br /> PERFORMANCE AUDITS <br /> A. Laboratory Contz:ol Standards and Check Samples <br /> Certified reference materials are acquired ftom the <br /> National Bureau of Standards for metals in tissue and sedi- <br /> mnnt-like matrices. EPA provides performance evaluation <br /> standards for both metals and Organics. Additional <br /> certified reference materials are provided by the American <br /> Industrial Hygiene Association as part of their laboratory <br /> certification program. Using them as laboratory control <br /> standards, our laboratories analyze these materials on a <br /> regular basis. This measure is particularly valuable in <br /> determining accuracy. <br /> Additional reference materials are provided through <br /> laboratory exchange of standards. At least Once every six <br /> months, upon'preparation or purchase of a new calibration <br /> standard, each of the two Analytical Services Division <br /> laboratories sends a portion of the standard to the other <br /> laboratory. This program assures that at least four times <br /> per year both laboratories analyze exactly the same <br /> standard solution for every test. Any disagreements are <br /> resolved before the new standard is put into service. <br /> B. Certification Programs <br /> The laboratories are subjected to performance audits <br /> initiated several times every year. Recent audits have <br /> included: <br /> j 1. USEPA semiannual drinkingwater <br /> check samples 01S series) . <br /> performance <br /> 2. USEPA semiannual wastewater performance check <br /> samples (WP series). <br /> $ 3. California Department of Health Services (Dolts) <br /> certification for the analysis of priority pollutants <br /> and agricultural pesticides in well water, 1984. <br /> �.. 4. Arizona Department of health Services certification for <br /> the analysis of Title 22 parameters and fumigants (cDB, <br /> DBCP) in drinking water. <br /> t <br /> VII-1 <br />