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-21- <br /> 5 . 3 . 1 A spiked sample is a sample to which a known amount <br /> of an analyte has been added before delivery to the <br /> laboratory. <br /> 5 . 3 . 2 A minimum of 5% of the samples submitted should be <br /> spiked with parameters of interest . <br /> 5 . 3 . 3 To prepare a spiked sample in- the Eield: <br /> a. Obtain the appropriate field standards . <br /> b. QCD will choose which well will have additional <br /> water drawn to be spiked. QCD also determines the <br /> correct concentration to spike the sample. <br /> C. The well should be capable of pumping sufficient <br /> water for both the spiked samples and normal samples . <br /> d. The specific protocol for the field preparation <br /> of spikes is listed in the Groundwater Standard Log. <br /> e. Record in the field log all weights and/or <br /> volumes of the samples and field standards used. <br /> Record field standard identification including date <br /> of preparation. <br /> f . Assign a neutral ID number to the spiked sample <br /> and record all information in the field log book . <br /> Label , seal and deliver the sample to the contract <br /> laboratory in the same manner as well samples . <br /> g. Assure that spike samples and well samples appear <br /> identical to the testing laboratory. <br /> 5 . 4 BLANKS <br /> 5 . 4 . 1 Blank samples must be submitted for each constituent <br /> of interest . A blank is a sample of HPLC water which <br /> is run through the sampling equipment (where prac- <br /> tical ) and analyzed as a well sample. When false <br /> positives are reported, they can be taken into <br /> account when evaluating sample result data. <br /> 5 . 5 SPIKED BLANKS <br /> 5 . 5 . 1 Spiked blanks are blanks that are spiked with the <br /> field standards . This is a control check of the <br />