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SOP for Surface Water Sampling — Hansen Project 3 <br />Figure 1. Sample collection from a Small Stream using a Swing Sampler <br />3.2 Equipment Decontamination <br />Before and between samples, all sample collection equipment will be decontaminated. If dedicated equipment <br />is used, it will be rinsed with distilled or deionized water. Mobile decontamination supplies will be provided so <br />that equipment can be decontaminated in the field. The decontamination solutions shall be replaced with clean <br />solutions between each decontamination operation (i.e., between each sample location). Used solutions will be <br />placed in a container for disposal as specified in the QAPP. A discussion of equipment decontamination is <br />contained in Appendix B of the Baseline Hydrologic Monitoring Plan. <br />3.3 Instrument Calibration <br />Electronic equipment used during sampling includes pH, temperature, ORP, DO, and specific conductance <br />measuring instruments. Before going into the field, the sampler must verify that all instruments are operating <br />properly. Most pH meters require frequent calibration and must be calibrated in the field before use at each <br />sampling station. The conductivity meter should be calibrated in accordance with the manufacturer's <br />recommended schedule. The DO meter must be calibrated at each monitoring station, immediately before use. <br />The ORP meter is factory calibrated and tested by EcoSense® and does not require specific calibration. <br />Calibration time and appropriate readings will be recorded in the fieldbook. Calibrations should be performed <br />according to instrument operations manuals and SOPS for Instrument Calibration (Appendix A). <br />3.4 Obtaining Water Samples - Small Streams <br />The following procedures are to be used to collect surface water samples in streams less than three to five feet <br />wide and one foot deep. <br />1. Assemble all necessary sample collection and filtering equipment. <br />2. Fill out sample labels for the sampling location, with all information except sample time. Set aside the <br />sample bottles designated for filtration. Assemble remaining bottles for filling. <br />3. Don clean latex gloves. <br />4. Measure and record field parameters. DO can be measured in -situ by suspending the DO probe in the <br />flowing stream. Depending on the instruments used, temperature, pH, and conductivity may be <br />4153A.140129 Whetstone Associates <br />