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The Leodville Mill <br />Environmental Sampling Procedures <br />Sampling Protocols <br />Page 1 -2 <br />• The photographer's name, the date, the time of the photograph, and the <br />general direction faced; and <br />• A brief description of the subject and the fieldwork portrayed in the picture. <br />1.2 QUALITY CONTROL <br />Field Quality Control (QC) is a part of the project Quality Assurance /Quality Control <br />program. This procedure describes the preparation and recommended collection <br />frequency of various field QC samples for aqueous and soil /sediment media. Table 1- <br />1 lists the QC sample types, preparation methods, and recommended frequencies for <br />the field sampling program. <br />At least one set of field QC samples shall be prepared for each sampling event. An <br />event is defined by any of the following conditions: <br />• An initiation of a new sampling round; or <br />• A significant change in sample type or media. <br />If the number of field QC samples taken is not equal to an integer multiple of the <br />interval specified in Table 1 -1, then the lowest multiple shall be used. For example, if <br />a frequency of 1 in 20 is indicated and 28 samples are taken, then one field QC <br />samples shall be prepared. <br />Field QC samples shall be properly labeled and shipped with field samples to the <br />laboratory. Sample custody shall also be properly maintained. <br />1.2.1 DESCRIPTION OF FIELD QC MEASURES <br />Field QC measures shall be implemented during sample collection activities to <br />preserve sample integrity. Sampling equipment shall be properly decontaminated to <br />minimize potential cross - contamination. In addition, new surgical -type gloves shall <br />be donned at each sample location and, when possible, the sampling program shall <br />proceed from "clean" to "dirty" areas. <br />1.2.2 DESCRIPTION OF FIELD QC SAMPLES <br />General descriptions of potentially applicable field QC samples follow below: <br />• Blind Decontamination Rinseate Blank (BDRB) - A BDRB is a sample bottle <br />containing distilled /deionized (DS /DI) water and preservative and is prepared <br />at the sample site. A BDRB is prepared for dissolved metals by processing a <br />April 2013 <br />