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Trip and field blanks. Trip and field blanks will be used during the sam- <br /> pling events to detect contamination introduced through sampling proce- <br /> dures, external field conditions, sample transportation, container prepara- <br /> tion, sample storage, and the analytical process. <br />' Trip blanks will be prepared at the same time and location as the sample <br /> containers for a particular sampling event. Trip blanks will accompany <br />' these containers to and from that event, but at no time opened or exposed <br /> to the atmosphere. One trip blank for volatile organic parameters will typi- <br /> cally be included for each sampling event. <br /> Field blanks will be prepared in the same manner as trip blanks but will be <br /> exposed to the ambient atmosphere at a specified monitoring point during <br />' sample collection to determine the influence of the external field conditions <br /> on sample integrity. One field blank for volatile organic parameters will <br />' typically be included for each day of sampling. <br /> Duplicate samples. Duplicate samples will be collected to document field <br />' precision. For each sampling event, duplicate monitoring well samples will <br /> be collected at a specified frequency, typically 5 percent. Where possible, <br /> field duplicates will be taken at sampling points known or suspected to <br /> contain constituents of interest. Duplicates will be packed and shipped <br /> blind to the laboratory for analysis with the samples from that particular <br /> event (i.e., these samples will not exhibit any special markings indicating <br /> rthat they are quality control samples). <br />' Laboratory Quality Control Procedures <br /> Laboratory quality control procedures will include those required under the <br /> DHS Hazardous Waste Testing Program. Specific laboratory quality <br />' assurance procedures are included in the laboratory's QA/QC manual, <br /> including reporting surrogate recoveries, matrix spike recoveries, and <br /> matrix spike duplicates (or duplicate) results. <br /> Method blanks will be analyzed daily to assess the effect of the laboratory <br /> ' environment on the analytical results. Method blanks will be performed for <br /> each parameter analyzed. <br /> Each sample to be analyzed for organic parameters will contain surrogate <br /> spike compounds. The surrogate recoveries will be used to determine if <br /> the analytical instruments are operating within limits. Surrogate recoveries <br /> P#\f921f920201 a C - 9 Rev. 0 June 1, 1992 <br />