Laserfiche WebLink
SOP No. 11.0 Sample Management -, _' <br />sampling site (in the same vicinity as the associated samples). It is handled like an <br />environmental sample and transported to the laboratory for analysis. <br />Field blanks are used to assess the potential introduction of contaminants from ambient sources <br />(e.g., blowing dirt, gasoline motors in operation; etc.) to the samples during sample collection. <br />The frequency of collection for field blanks shall be a minimum of one field blank for every 20 <br />environmental samples that are collected for organic analyses. Field blanks shall be collected at <br />or near a sample location and if possible, downwind of possible contamination sources. <br />6.1.4 Rinsate Blank <br />A rinsate blank is a sample of ASTM Type II reagent grade water poured into or over or pumped <br />through the sampling device, collected in a sample container, and transported to the laboratory <br />for analysis. ASTM Type II reagent grade water obtained from the laboratory is used to prepare <br />the rinsate blank sample. Rinsate blanks are used to assess the effectiveness of equipment <br />decontamination procedures used to prevent cross-contamination between sampling locations. <br />The frequency of collection for rinsate blanks shall be a minimum of I rinsate blank for every 20 <br />environmental samples collected with a given type of sampling equipment, and only for sampling <br />equipment which is decontaminated and reused to collect environmental samples. Rinsate blanks <br />will be prepared in a manner identical to samples and shall be analyzed for all laboratory analyses <br />requested for the environmental samples collected at the site using the subject equipment. <br />6.1.5 .Trip Blank <br />The trip blank consists of a VOC sample vial filled in the laboratory with ASTM Type II reagent <br />grade water, transported to the sampling site, handled like an environmental sample and returned <br />to the laboratory for analysis. Trip blanks are not opened in the field. Trip blanks are prepared <br />only when VOC samples are taken and are analyzed only for VOC analytes. Trip blanks are used <br />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 same <br />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 />4/23/07 Page 6 of 19 R Squared Inc.