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ACZ Laboratories, Inc. August 10, 2007 <br />Quality Assurance Plan Version 12 <br />SOPAD018.08.07.12 Page 47 of 96 <br />11.3 Other Control Indicators <br />11.3.1 Internal Standards <br />Internal Standards (IS) are measured amounts of certain compounds added after preparation or <br />extraction of a sample to be analyzed by GUMS or ICPMS. The IS is an analyte not likely to be <br />found in the environment and is used in a calibration method to correct sample results affected by <br />column injection losses, purging losses or viscosity effects. The IS is added to client samples, <br />controls and blanks in accordance with the method requirements. When the results are outside of the <br />acceptance limits for applicable quality control samples, corrective actions shall be performed. Once <br />system control has been reestablished, all samples analyzed while the system was malfunctioning <br />shall be reanalyzed. If corrective actions could not be performed or are ineffective then the data for <br />each client sample must be appropriately qualified on the final report. <br />11. 3.2 Trip Blank <br />The trip blank is a sample container filled in the laboratory with Type I water that is shipped to the <br />collection site in the sample cooler, returned to the laboratory, logged-in, and analyzed in the same <br />manner as the client samples. With the exception of Hg-1631, trip blanks are not opened in the field. <br />If a target analyte is detected in the trip blank then the appropriate data qualifier is applied to pertinent <br />results from those samples returned to ACZ in the same cooler as the trip blank. Trip blanks are <br />'. typically prepared for Hg-1631, Cyanide, and VOA samples. <br />11.3.3 Instrument Blank <br />The instrument blank is an aliquot of Type I water processed only through the instrument steps of <br />sample analysis and is used to determine presence of instrument contamination. For Organic <br />instrument methods, neither surrogate nor IS standards are added. <br />11. 3.4 Equipment Blank <br />An equipment blank is provided by the client and is used to assess the effectiveness of equipment <br />decontamination procedures. Type I water is poured into (or over) or pumped through the sampling <br />device, collected in a sample container and transported to the lab to be analyzed for all parameters <br />requested for the environmental samples collected at the site. If any target analyte is detected then all <br />associated sample results must be qualified on the final report. <br /> <br />11. 3.5 Ambient Blank <br />The ambient blank consists of Type I water poured into a VOA vial at the sampling site (in the same <br />vicinity as the associated samples). It is handled like an environmental sample and transported to the <br />laboratory for analysis. Ambient blanks are prepared when samples are to be analyzed for VOA <br />analytes and are used to assess the potential introduction of contaminants from ambient sources (e.g., <br />active runways, engine test cells, gasoline motors in operation, etc.) to the samples during sample <br />collection. The frequency of collection for ambient blanks is specified in the client's field-sampling <br />plan and are not required for all projects. <br />2773 Downhill Drive 970-879-6590 <br />Steamboat Springs, CO 80487 www.acz.com