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(d) Three pressure meters installed near each well <br />head to continuously monitor and record on 10 <br />minute intervals: 1} the injection pressure, 2) <br />the production pressure, and 3) the pressure in <br />the annulus between the longstring casing and <br />tubing. <br />(e) Instrumentation for continuous display of the <br />calculated depth to the fluid/mining solution <br />interface in the annulus between the longstring <br />casing and tubing. The calculated depth <br />displayed shall be accurate to within operational <br />and safety standards. <br />(f) Temperature monitoring devices with digital <br />recording every 10 minutes installed on the <br />injection and production flow lines of each <br />solution mining well near the well head. <br />(g) Any other monitoring devices or equipment <br />necessary to meet monitoring requirements (see <br />Part II D.), for evaluation of mining cavity <br />growth, for detection of subsidence due to <br />solution mining activity, and for the measurement <br />of ground-water level and quality. <br />9. Proposed Chanoes and Workovers. The operator shall <br />give advance notice to the Director at least 13 days <br />before any planned physical alterations or additions <br />to the permitted well(s). Alterations or workovers of <br />the permitted well(s) shall meet all conditions as set <br />forth in this permit. <br />The operator shall provide all records of well <br />workovers, logging, or other test data to EPA within <br />thirty (30) days of completion of the activity. <br />Appendix B contains samples of the appropriate <br />reporting forms. <br />After well workovers or alterations, the Director may <br />require a demonstration of Part I mechanical integrity <br />(tubing/casing annulus pressure test) using a <br />temporary packer, or other test approved by the <br />Director, prior to resuming injection activities. <br />5. Formation Testing. Natural Soda has submitted <br />sufficient information on the formation in its <br />application. No further specific testing of the <br />formation is required. However, if any testing or <br />Page 9 of 120 <br />EPA FINAL Area Permit No. CO3870-00000 <br />