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The surface rrlonumenks consist of a survey pin cemented to bedrock within a <br />casing. The completion is intended to eliminate frost heaving. <br />3.0 Cavity onfigu_rati~ <br />Cavity growth, size and geometry will be monitored throughout the operating <br />life of the wells according to the procedures listed below: <br />- Frequent (rnonthly) calculation of cavity volume based on daily <br />measurement of injection/recovery fluid (flow, temperature, and <br />density). <br />- Periodic use of leashing simulation model with volume calculation, <br />to predict cavity development (shape and size). <br />- Periodic cavity surveying below the vertical wells with sonar caliper <br />tool as neca;ssary to confum the model. Active vertical production <br />wells will tie surveyed, at a minimum, during mining and at <br />completion of mining. In addition, WRN will continue to pursue <br />alternative mapping technology. <br />SECTION IV -PRODUCTION WELL MECHANICAL INTEGRITY <br />In compliance with BLM and EPA stipulations, WRN will perform a two <br />33 <br />