Laserfiche WebLink
~*~ <br />A. WELL CONSTRUCTION REQUIREMENTS <br />*~* <br />3. Monitoring Devices <br />*** <br />Cavity development ..... <br />*** <br />(2°d paragraph) The applicant has prepared the Subsidence Monitoring Plan dated <br />August 2004, which was submitted to the BLM, Colorado Division of Minerals <br />and Geology (CDMG) and the EPA. This plan is incorporated into this Permit as <br />Appendix J. As provided in this plan, the permittee shall establish surface <br />monitoring monuments on well casings and well pads in addition to establishing <br />land surface monuments at certain section and quarter section corners. The <br />subsurface monitoring plan includes the test installation of coaxial cable in <br />solution mining we1120-12 bore for use of Time Domain Reflectometry (TDR), to <br />detect differential movement close to the top of the cavity and above. If <br />subsurface movement occurs, the coaxial cable will break or stretch. The location <br />of the change in coaxial cable properties will be determined by use of a cable <br />tester. Borehole geophysical logs will be run twice for each well in service during <br />the life of a well: (1) following initial drilling of the well and (2) after retirement <br />of the well. Corrective action will be implemented if necessary. The Director <br />may also require changes in the operating plan for new cavities, such as a larger <br />pillar between individual cavities. The shape of the cavity is, of course, an <br />important element that affects subsidence. For that reason, the permittee has <br />evaluated techniques for and undertaken studies to assess cavity shape. <br />Depending on the results of these studies, American Soda maybe required to <br />establish additional monitoring wells to better track cavity influence on the pillars. <br />*** <br />(4"' paragraph) The injection fluid and production fluid ~i~elines shall be <br />eauipned with sampling_ports to facilitate periodic collection of samples for <br />chemical analysis. Injection fluid samples shall be collected from the pipeline <br />upstream of where the pipeline branches to feed all solution mining wells. <br />Production fluid shall be sampled on the production trunk pipeline prior to <br />entering a gas separator. Samples of both the production and the injection fluid <br />shall be collected and analyzed according to the Ground Water Surface Water, <br />and Process Monitoring plan (the Water Monitoring Plan), Appendix I. <br />(5`h paragraph) Monitoring of water quality and water level shall occur <br />according to the Water Monitoring Plan, Appendix I. The Permittee has already <br />FINAL: Modification No. 9, UIC Area Permit No. C030858-00000 <br />Page 7 of 46 <br />