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�..! %"we • Time, date, location, and weather conditions • Description of the subject photographed • Name of person taking the photograph 9.0 QUALITY CONTROL 9.9 Field Blank Samples Field blanks will be prepared to evaluate if the shipping and handling procedures are introducing contaminants into the samples, and if cross contamination in the form of VOC migration has occurred between the collected samples. Field blanks will be prepared as described in Section 4-5 for RAP volatile organic compounds plus MTBE, RAP TPH for gasoline, CLPAS semi- volatile organic compounds, CLPAS pesticides, and CLPAS metals. A minimum of one field blank will be submitted to the laboratory for analysis with every shipment of samples. Field blanks are 40 ml vials, 1 liter amber glass jars, and 1 liter polyethylene bottles that have been filled with HPLC-grade water, prepared in the field, and are shipped to the laboratory in the same cooler with the samples collected for the respective analyses. Blanks will be preserved, packaged, and sealed as appropriate for water samples. A separate CLP sample number and station number will be assigned to each blank, and it will be submitted blind to the laboratory. 9.2 Laboratory Quality Control Samples Laboratory quality control (QC) samples are analyzed by the Region IX Laboratory as part of the standard laboratory QC protocols. The laboratory monitors the precision and accuracy of the results of its analytical procedures through analysis of QC samples. In part, Iaboratory QC samples consist of matrix spike samples and matrix spike duplicate samples. The term "matrix" refers to use of the actual media collected in the field (i.e., routine soil and water samples). Laboratory QC samples are an aliquot (subset) of the field sample. They are not a separate sample but a special designation of an existing sample. A routinely collected soil sample (a full 8 oz sample jar or two 120 mL sample vials) contains sufficient volume for both routine sample analysis and additional laboratory QC analyses. However, for water samples, double volumes of samples are supplied to the laboratory for its use. Two sets of water sample containers are filled and all containers are labeled with a single sample number. The laboratory is alerted as to which sample is to be used for QC analysis by the notation on the sample container label and the traffic report and chain-of-custody record or packing list. At a minimum, one laboratory QC sample is required per week or one per 20 samples (including blanks and duplicates), whichever is greater. If the sample event lasts longer than 1 week or involves collection of more than 20 samples per matrix, additional QC samples will be designated. For this sampling event, samples collected at the following locations will be the designated laboratory QC samples: n:062IOMSAPlwebsap2.wp5 WEBER BLOCK (Area 9) Sampling and Analysis Plan Q Page 21