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Proposed Sampling and Analysis Plan <br />Lyons Quarry <br />CEMEX proposes this sampling and analysis plan as a technical revision to permit M1977-208 <br />to supercede the existing plan as outlined in Technical Revision O1 of this mining permit. <br />Anal~ical Parameters <br />The Division of Minerals and Geology (DMG) has identified the following five parameters. <br /> Applicable Analytical <br />Analyte MCL Standard Method <br />Dissolved Selenium 0.02 m /L <br />A <br />i <br />l <br />l EPA 200.8 <br /> gr <br />cu <br />tura <br />H 6.5 - 8.5 <br />P <br />i EPA 150. ] <br /> r <br />mary) <br />( <br />Total Dissolved Solids 581 m /L EPA 160.1 <br />Sulfates 250 m L Drinking Water EPA 300.0 <br />Chlorides 250 m L (Secondary) EPA 300.0 <br />These parameters were selected based upon concentrations present in previous tests. CEMEX <br />proposes to remove thallium from the list of analytical parameters. Past sampling has shown <br />thallium to be either below detection limit or well below the numeric protection level standard. <br />Monitoring and Compliance Points <br />CEMEX proposes to install two wells to serve as monitoring and compliance points. The first <br />well designated as the monitoring point (Well 1) will be located midway between A and C Pit <br />along the hydraulic gradient. The second well designated as the compliance point (We112) will <br />be located downgradient from A-Pit as near as feasible to the CEMEX property boundary. Both <br />wells will be drilled and screened to collect groundwater from the Fort Hays Limestone member. <br />Both wells will be sampled quarterly. If four consecutive quarters yield results below the MCL, <br />then sampling frequency will be reduced to annual. If annual samples yield results above MCL, <br />quarterly sampling will resume. Sampling will continue until four years following closure and <br />reclamation of C-Pit or elimination of the C-Pit pond. These results will be reported to the DMG <br />in a quarterly report (see Reporting below). <br />Well Samylin¢ Protocol <br />Wells with extremely slow recharge rates due to tight formation materials, may require alternate <br />purging and sampling methods. If normal purging is clearly impractical, the well will be <br />pumped to near dryness and allowed to partially recover (a reasonable amount of time) two times <br />before sampling. Sampling will then commence as soon as possible after the second evacuation. <br />The conditions and procedures used will be clearly noted on the sample information form and in <br />the Sampling and Analysis Report as an exception to protocol. <br />