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Criteria for purging a well are summarized in Table 1. <br /> Parameter Purge Criteria <br /> Purge volume >_1 pump/tubing fluid volume <br /> Flow rate >100 mL/m and <500 mL/m <br /> Water level Minimal to no drawdown <br /> pH ± 0.1 pH units <br /> Specific Conductance ± 10 percent <br /> Table 1.Summary of Groundwater Purge Protocol. <br /> Higher TDS purge water will be collected in a five gallon bucket or other suitable container and <br /> discarded into the NS waste pond or other appropriate receptacle. <br /> 3.1 Sample Collection <br /> Groundwater and injectate samples will be collected with an approved method (Appendix B, <br /> Sections B.6, "General Considerations for the Sampling of Liquids," and B.B, "Standard Practice <br /> for Purging of Monitoring Wells"). Sample collection will be conducted using the same flow <br /> rate used during the purging of the well. Refer to Section B.13, "Standard Practice for the <br /> Collection and Preservation of Liquid Samples," in Appendix B. The approved Iaboratory2 <br /> provides NS with pre-cleaned and pre-preserved sample bottles. In addition, the laboratory <br /> handles the QA/QC protocols for all groundwater samples. NS conducts all field sampling, field <br /> data collection, and sample collection. NS is responsible for ensuring groundwater samples are <br /> delivered to the laboratory within the required hold times and preservation techniques. Daub <br /> performs additional QA/QC by compiling all analytical data and cross checking the data with <br /> historical values. <br /> 3.2 Field Measurements and Calibration <br /> General methodologies for field measurements are located in Appendix B, Sections B.9 through <br /> B.13. Calibration of field instrumentation will be conducted according to manufacturer's <br /> recommendations, refer to Table 2 for basic calibration checks. If calibration acceptance <br /> criteria are not met during the operational check, a primary calibration of the affected probe(s) <br /> and instruments(s) must be conducted. Probe replacement or cleaning may also be required if <br /> the operational acceptance criteria are not met, per the manufacturer's calibration <br /> specifications. <br /> 2 ACZ Laboratories, Inc. in Steamboat Springs, CO is currently contracted to NS for water sample <br /> analyses. <br /> Daub&Associates, Inc. 5 NS LLC 2022 SAP <br />