2004-09-08_REVISION - M1999002 - Laserfiche WebLink

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location at Yankee Gulch and once per year for the domestic well located off site from Yankee Gulch. These level measurements would be made in conjunction with the water quality sample collection. No production solution mines would be in operation and no brine solution would be circulating in the wells or the pipelines. All stand-by status production wells that are not plugged and abandoned would be at ambient temperature and pressure with cast-iron bridge plugs set. The constituent list would include the twelve laboratory parameters and four field measurements specified in the bottom portion of Table 3. No water quality sampling will take place at well 20-4A in either the interim status or commercial production monitoring plans. The well was a re-completed B Groove monitoring well that shows elevated pH as a result of cement contact through the perforation. Only water level data is of value ai this point. Well 19-3 was drilled to detect leakage from an evaporation pond that was never constructed. The well has never had sufficient water to collect a sample. The well will be checked for water level during each sampling event and ii sufficient water is present a sample will be collected. Once commercial production operations resume, water levels will be monitored continuously using water level probes at dissolution surface monitoring sites and monthly with a manual measuring device at all other locations. Information provided from the first five years of operation indicates that water level monitoring is the best primary indicator of an influence from solution mining. Ground water sampling would continue to take place on a quarterly frequency. The constituent list in Table 4 summarizes the proposed commercial production monitoring plan. All proposed laboratory and field constituents are the same for both the interim status and commercial production time periods. The contingency in both interim status and commercial production monitoring plans would be to increase the frequency of monitoring in the event that the data indicates it is necessary to do so to evaluate an occurrence outside of Permit Condition Values. Permit Condition Values would include established Numeric Protective Standards for applicable point of compliance wells and Early Warning Indicators for all other wells with the exception of up-gradient or control wells. During interim status, a verification sample would be collected in the month following the second quarterly sample containing one or more indicator parameters that are outside of Permit Condition Values. Once commercial production resumes, a verification sample would be collected in the month following the first sample containing one or more indicator parameters that are outside of Permit Condition Values. Notification would be made to the Drvisron of Minerals and Geology within 5 days of processing the data reports from the lab for any constituents outside of the Permit Condition Values regardless of the operational status of the project. If the first verification sample also lies outside of the Permit Condition Values. a second verification