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(11/87) 2. Blank and Background Samples * Blank Samples Blank samples are required for water sampling only. Collect at least one blank/day/shipment/lab. Blank samples are a check for cross-contamination during sample collection and shipment and in the laboratory. Use analytically certified organic free water for organic parameters. Use deionized water for inorganic parameters. Blank samples should be analyzed for the conplete parameter suite. The blank is collected, numbered, packaged, and sealed in the sane manner as the other samples. Only one type of blank need be collected. Blanks are listed below in order of collection preference. a. Equipment Blank Collect after the last rinse of the equipment decontamination process. Use the appropriate "blank" water identified above to fill equipment and then pour it into the appropriate containers. An equipment blank should be collected each time the sampling equipment is decontaminated and reused in the field. b. Field Bottle Blank Collect when decontamination of equipment is not necessary or possible. The field bottle blank should be poured at a sampling point. c. VOA Tavel Blank Collect when there is no other type of VOA blank. All of the VOA vials should be shipped in the sane container as the VOA blank. * Background Samples (soil & surface water) Background samples should be analyzed for the complete parameter suite. Background is collected, numbered, packaged, and sealed in the sane manner as the other samples. Collect 10% background samples for long term sampling projects. * Blank and background samples must be identified on the Region 9 copy of the sanple paperwork, not the lab copy. These samples are blind to the lab. 3. Lab QC Samples * Select one field sample Der week or 1 per 20 samples (including blanks and duplicates) , whichever is greater, and designate that sample as the "Lab QC Sample" . This sample is quality control sample for laboratory duplicate and matrix spike analyses. - 8 -