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1) Adverse water quality impacts have been detected in the groundwater. <br /> 2) When a new phase of mining begins (e.g., Phase 3 of mining is completed, and <br /> Phase 4 begins). <br /> 1 .3. Sampling Parameters <br /> Grand Junction Pipe & Supply Co. will perform field and laboratory analysis of their samples for <br /> the water quality parameters identified in Table 1. These parameters are those listed in Tables <br /> 1-4 of the CDPHE Regulation 41 for Domestic Water Supply, Agricultural Standards, and TDS <br /> Water Quality Standards. All laboratory analysis of the groundwater samples will be performed <br /> by a State of Colorado certified laboratory that follows industry standards and quality <br /> assurance/quality control (QA/QC) procedures. <br /> Delta Paving Gravel Pit <br /> Groundwater Monitoring Plan G-2-4 © Lewieki 81 Associates <br /> September 2022 <br />