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<br /> <br />Pressure recording devices shall be installed to <br />continuously monitor and record on ten (10) minute <br />intervals the pressure of the gas blanket that shall be <br />maintained in the annulus between the intermediate <br />casing and the tubing system. <br />1 <br />Inlet and discharge temperatures and pressures shall be <br />continuously monitored and recorded on ten (10) minute <br />intervals in the injection fluid and production fluid <br />flow lines at locations close to the flow meters and <br />density meters. These data measurements shall be used <br />both for process control and for correlation with the <br />fluid density measurements. <br />Subsequent to initial MIT: additional MIT (s) shall be <br />conducted as necessary, and in no case less frequently <br />than once every five (5) years as required in 40 CFR § <br />146.33 (b) for Class III wells, during the life of the <br />solution mining wells. If the fluid and pressure data <br />suggest that there may be possible fluid movement, <br />either beyond the confines of the solution mining <br />cavity or beyond the outermost casing, an MIT shall be <br />conducted immediately. The results of any MIT(s) shall <br />be submitted in the first quarterly monitoring report <br />after the MIT has been conducted and will include the <br />following information: <br />• date, time, and interval of each MIT <br />measurement; and <br />• individual(s) who performed the MIT <br />measurements; and <br />• dates of calibration of the MIT equipment; <br />and <br />• techniques and equipment used to collect MIT <br />measurements; and results of the temperature <br />log, noise log, tracer survey other <br />equivalent MIT log designed to monitor fluid <br />movement behind pipe. <br />Cavity development shall be monitored to estimate <br />cavity size. Because the leached solution cavity will <br />be a matrix of oil shale rather than a void, size and <br />shape must be determined by indirect methods and <br />standard logging methods used in mining operations <br />will not be accurate. Material balances of the <br />volumetric fluid flow rates into and out of the <br />solution mining cavities shall be performed. <br />EPA FINAL Area Permit No. CO3858-00000 <br />Page 11 of 164 <br />