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SOP No. 11.0 Sample Management <br />only when VOC samples are taken and are analyzed only for VOC analytes. Trip blanks are <br />used to assess the potential introduction of contaminants from sample containers or during the <br />transportation and storage procedures. One trip blank should accompany each cooler sent to the <br />laboratory containing samples for analysis of VOCs. <br />6.1.6 Field Duplicates <br />A field duplicate sample is a second discrete sample volume collected at the same location as the <br />original sample; homogenization is not performed between the original sample and the field <br />duplicate. Aqueous field duplicate samples are collected from successive volumes from the <br />same sample source and device (e.g., bailers). Sediment and soil field duplicates are collected in <br />succession from the same sample source and device. Field duplicate samples are collected using <br />identical recovery techniques, and treated in an identical manner during storage, transportation, <br />and analysis. The sample containers are assigned an identification number in the field such that <br />they cannot be identified (blind duplicate) as field duplicate samples by laboratory personnel <br />performing the analysis. <br />Field duplicate sample results are used to assess precision of the sample collection process and <br />the heterogeneity of the medium sampled. The frequency of collection for field duplicates is a <br />minimum of one field duplicate sample from each group of 20 environmental samples of a given <br />matrix. Specific locations for collection of field duplicate samples may be designated prior to <br />the beginning of sample collection. <br />7.0 DOCUMENTATION AND TRACKING <br />7.1 FIELD NOTES <br />Documentation of observations and data acquired in the field will provide information on the <br />acquisition of samples and also provide a permanent record of field activities. The observations <br />and data will be recorded with waterproof ink in a permanently bound weatherproof field <br />logbook with consecutively numbered pages and, if applicable, on field sampling data sheets. <br />The information in the field logbook will include the following as a minimum. Unless <br />information is recorded on a field sample collection form and that form is cross referenced in the <br />logbook entry. Additional information is included in the specific SOPS regarding the appropriate <br />data sheets. <br />• Project name <br />• Location of sample <br />• Date and time of sample collection <br />• Sample identification numbers and sample depth (if applicable) <br />• Description of samples (matrix sampled), composite or grab sample <br />• Analysis to be performed <br />4/23/07 Page 6 of 9 R Squared Inc. <br />Attachment A