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Redwood City <br /> Water Quality Monitoring Program Plan <br /> <br /> <br />© 2014 DKF Solutions Group, LLC Page 20 of 41 <br />areas, and prevents the mixing of incompatible substances. <br /> <br />Gross contamination can be removed by physical decontamination procedures. These <br />abrasive and non-abrasive m ethods include the use of brushes, air and wet blasting, and <br />high and low pressure water cleaning. <br /> <br />The decontamination procedure described above may be summarized as follows: <br />1. Physical removal <br />2. Non-phosphate detergent wash <br />3. Tap water rinse <br />4. Distilled/deionized water rinse <br />5. 10% nitric acid rinse <br />6. Distilled/deionized water rinse <br />7. Solvent rinse (pesticide grade) <br />8. Air dry <br />9. Distilled/deionized water rinse <br /> <br />D. Sample Labeling and Chain of Custody Procedures <br />A sample is a physical evidence of a facility or the environment. An essential part of all <br />enforcement investigations is that evidence gathered be properly documented. To accomplish <br />this, the following sample identification and chain of custody procedures are established. <br /> <br /> <br />1. The method of sample identification depends on the type of measurement or analyses <br />performed. When in-situ measurements are made, the data are recorded directly in Field <br />Data Worksheets with identifying information, field observations, and remarks. Examples <br />of in-situ measurements are: <br /> pH <br /> Temperature <br /> Dissolved Oxygen <br /> Stream Flow Measurement <br /> <br />Samples other than in situ measurements, must be identified by a sample label. These <br />samples are removed from the sample location and transported to a laboratory for <br />analyses. Before removal, however, a sample is often separated into portions depending <br />upon the analyses to be performed. Each portion is preserved in accordance with <br />applicable procedures and each sample container is identified by a sample label. <br /> <br />2. At a minimum, the following grab samples will be collected, in duplicate: <br /> Field Blank: See Section 9.B for discussion. <br /> Upstream: This sample will be collected far enough upstream of the SSO’s point of <br />entry into the surface water as to be free of contaminants from the SSO. Typically, <br />50-feet is sufficient, but this may vary on circumstances of the spill. <br />6.2.A. - Page 186