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• 4.1.8 Other Activities <br />Production recovery operations to each of the active cavities was guided by the <br />potientiometric levels monitored in the surrounding Dissolution Surface aquifer monitoring <br />wells. Throughout the year injection and recovery rates were adjusted, to reduce <br />monitoring well levels to historical levels, or to maintain at historical levels. <br />A sonar survey was attempted on WRN 4A-4V, the recovery well for cavity #4 during a <br />pump changeout. Due to survey tool access problems as a result of roof (cavity) and <br />casing damage, the survey was not successful. <br />• 4.2 Off-Site Facilities <br />4.2.1 Railcar Loadout at Lacy Station <br />A railcar loadout facility at Lacy Station, approximately five miles west of Rifle, Colorado, is <br />utilized by a shipping contractor for railcar loading and shipping WRN's sodium bicarbonate. <br />4.2.2 Rifle Warehouse <br />A warehouse was utilized in Rifle, Colorado to provide storage of bagged product and to <br />simplify shipping of product. <br />• <br />15 <br />