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SOP No. 11.0 Sample Management <br />prepare and analyze a MS sample and a laboratory duplicate sample as discussed below. <br />Analysis of a MS/MSD or MS/LD sample set to assess matrix effects on accuracy and precision <br />is typically dependent on the analyte class (e.g., inorganic vs. organic) and the likelihood of <br />detecting the target analyte. <br />6.1.2 Laboratory Duplicate <br />A laboratory duplicate (LD) is prepared by taking an additional aliquot of a sample and <br />preparing and analyzing it in the same fashion as the parent sample. The LD is used to assess the <br />precision of the method due to sample matrix. A minimum of one LD shall be analyzed for <br />every 20 environmental samples of a given matrix. Alternately, the laboratory may analyze a <br />MS/MSD pair as a means of assessing precision. Analysis of a MS/MSD or MS/LD sample set <br />to assess matrix effects on accuracy and precision is typically dependent on the analyte class <br />(e.g., inorganic vs. organic) and the likelihood of detecting the target analyte. <br />6.1.3 Field Blank <br />The field blank consists of American Society of Testing and Materials (ASTM) Type II reagent <br />grade water supplied by the laboratory that is poured into applicable sample container at the <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 orgy 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 1 rinsate blank for every 20 <br />environmental samples collected with a given type of sampling equipment, and only for <br />sampling equipment which is decontaminated and reused to collect environmental samples. <br />Rinsate blanks will be prepared in a manner identical to samples and shall be analyzed for all <br />laboratory analyses requested for the environmental samples collected at the site using the <br />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 />4/23/07 Page 5 of 8 R Squared Inc. <br />Attachment A