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THE REMEDIATION GROUP, ine <br /> C Field Blank Sample - A field blank will consist of deionized or organic-free water that <br /> is added to the sample bottles at the time of sample collection The water sample may <br /> be poured into appropriate containers in the field to simulate actual sampling conditions <br /> The field blank will be collected at the point of highest suspected contamination in order <br /> to determine if atmospheric conditions are introducing contamination The field blanks <br /> will be preserved in the same manner as the groundwater samples and will be stored with <br /> the groundwater samples One field blank will be collected for each sampling event or <br /> according to quality control goals set for the project <br /> D Equipment Blank Sample - An equipment blank sample may be collected to monitor the <br /> adequacy of the decontamination procedures for equipment used at all wells (such as the <br /> bailers) or equipment used on all samples (such as field filters) This sample will be <br /> collected by placing organic-free or detonized water in or on the subject piece of <br /> equipment so as to contact any possible residual contamination on the equipment, and <br /> then collecting this water into appropriate sample containers for analyses Ata minimum, <br /> one equipment blank should be collected per sampling event or according to the quality <br /> control goals set for the project <br /> E Matrix Spike Sample - The accuracy of analytical determinations may be estimated by <br /> using spiked samples In this method, a known amount of a chemical is added to a <br /> sample in which the concentration of that chemical is known If the concentration in the <br /> original sample is low within the range of interest, the concentration should be doubled <br /> . If the concentration in the original sample is in the middle of the range of interest, the <br /> concentration should be brought to about 75 percent of the upper limit of the range <br /> Samples which contain concentrations near the upper limit of the range of interest will <br /> not be spiked <br /> 2.7 Storage and Transportation <br /> Efforts will be made to store and transport supplies and samples safely Exposure to dust, direct <br /> sunlight, high temperature, and adverse weather conditions will be avoided whenever possible <br /> Samples will be transported to the analytical laboratory as soon as possible and within the <br /> maximum holding time prescribed for the requested analyses Samples sent to the hazardous <br /> waste laboratory by common carrier will have proper hazardous-waster labelling affixed, if <br /> necessary <br /> 3.0 FIELD MEASUREMENTS <br /> The following field measurements will be performed on groundwater samples Data obtained <br /> from field water quality measurements will be recorded in the field log book or on data sheets <br /> Separate aliquots of groundwater from a monitoring well shall be used to make field <br /> measurements (samples for laboratory analysis will not be reopened) <br />• <br /> protocol sw 4 16 July 1994 <br />