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TREADWELL & ROLLO <br /> taken once every ten samples, or according to quality control goals set for the <br /> project <br /> B Travel Blank Sample - The effect of handling, transportation, and accuracy of <br /> analytical determinations may be estimated by using travel blank samples. This <br /> sample will be prepared by the laboratory supplying the sample containers by <br /> filling the containers with organic-free water This blank will be used to identify <br /> contamination introduced from the originating laboratory The trip blank will <br /> remain with the collected samples and will be analyzed along with the field <br /> samples to check residual contamination One trip blank will be used per sample <br /> set <br /> C. Field Blank Sample - A field blank will consist of deionized or organic free water <br /> that is added to the sample bottles at the time of sample collection The water <br /> sample may be poured into appropriate containers in the field to simulate actual <br /> sampling conditions The field blank will be collected at the point of highest <br /> suspected contamination in order to determine if atmospheric conditions are <br /> introducing contamination The field blank sample bottles will be preserved in <br /> the same manner as the groundwater samples and will be stored with the <br /> groundwater samples One field blank will be collected for each sampling event <br /> • or according to quality control goals set for the project <br /> D Equipment Blank Sample - An equipment blank sample is taken to ensure that <br /> decontamination procedures for equipment used at all wells (such as the bailers) <br /> or equipment used on all samples (such as field filters) is adequate This sample <br /> will be taken by placing organic-free or deionized water in or on the subject piece <br /> of equipment so as to contact any possible residual contamination on the <br /> equipment, and then collecting this water into appropriate sample containers for <br /> analyses At a minimum, one equipment blank will be collected per sampling <br /> event <br /> E Matrix Spike Sample - The accuracy of analytical determinations may be <br /> estimated by using spiked samples In this method, a known amount of a <br /> chemical is added to a sample in which the concentration of that chemical is <br /> known If the concentration in the original sample is low within the range of <br /> interest, the concentration should be doubled If the concentration in the original <br /> sample is in the middle of the range of interest, the concentration should be <br /> brought to about 75 percent of the upper limit of the range Samples which <br /> contain concentrations near the upper limit of the range of interest will not be <br /> spiked <br /> A-4 <br /> 110707{]9 PJC 1 April 1994 <br />