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11t �0 INC <br /> 40 Groundwater Sampling Protocol <br /> All equipment that is used in a monitoring well for purging, sampling or depth measurement <br /> shall be decontaminated by steam cleaning or a TSP wash and triple-rinse procedure prior <br /> to use and before reusing when purging or sampling <br /> 1. Start at the furthest up-gradient well and work down-gradient. <br /> When contamination is suspected, sample the clean wells first. <br /> 2. Obtain access to well and check well head for damage or <br /> tampering. <br /> 3 Measure depth to groundwater and calculate well volume. <br /> 4. Check and record pH, temperature and conductivity. <br /> 5 Purge a minimum of three to five well volumes, cleaning the <br /> bailer between runs. The purging rate should not be so great as <br /> . to dry the well or have the formation water cascade down the <br /> casing If purging causes the well to be pumped dry, allow it to <br /> recharge for up to 24 hours prior to sampling. If it does not <br /> recharge within 24 hours, it is considered a dry well. <br /> 6. Dump or pump purged water directly into barrels onsite and hold <br /> for proper disposal. <br /> 7 After purging, check and record pH, temperature and <br /> conductivity every 10 minutes until they stabilize. Stability is <br /> indicated by having two consecutive measurements within 0 5 <br /> units of pH, within two degrees Fahrenheit for temperature and <br /> within 5 percent for conductivity. <br /> 8 Pour samples from bailer directly into sample bottles. For <br /> bottles without preservation, rinse cap and bottle two to three <br /> times with well water and fill keeping the head space to a <br /> minimum. For bottles with a preservative, DO NOT RINSE, just <br /> fill and maintain a minimum head space. <br /> 9. Place samples in cooler with "dry ice" or "blue ice" for <br /> transportation to the laboratory <br /> APPENDIX li <br /> 19150011 030 6 <br />