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Also, the BLM's approval of a commercial-scale mine <br />• plan would require baseline monitoring of the upper <br />two zones in addition to the lower two zones at <br />least 6 months prior to beginning the project. <br />April 1988 Leasee submitted a Comprehensive Monitoring Plan <br />for commercial operations to BLM and EPA. <br />Sept. 1988 Received UIC Permit with required monitoring. <br />March 1989 UIC Permit modifications approved. Monitoring <br />Qroaosed by leasee and approved by EPA required: <br />1. Four up gradient wells are required in <br />vicinity of IRI-1 and to be completed in four <br />aquifer zones. (20' interval) <br />2. Utilize IRI-4, IRI-5 and IRI-6 to monitor <br />above Dissolution Surface, B-Groove and A- <br />Groove. <br />• <br />3. One set of permanent monitoring wells for the <br />B-Groove, Dissolution Surface and Perched <br />aquifers on the down gradient side of each <br />five year mine block (EX-2 site selected). <br />4. A Dissolution Surface monitoring well shall be <br />established between the first and second <br />caverns. <br />5. At least eight additional Dissolution Surface <br />and at least four additional B-Groove <br />monitoring wells shall be established in first <br />five year block (use of former production <br />wells). <br />6. Each subsequent five year block shall have at <br />least seven Dissolution Surface and three B- <br />Groove monitoring wells. One Dissolution <br />Surface well shall be established between <br />cavities. <br />• <br />Oct. 13, 1989 BLM (District Manager) acknowledged notification of <br />leasee's (pilot) planned field activity, <br />established bonding and stated that operations are <br />to be conducted in accordance with the approved <br />mine plan, EPA's UIC Permit and the April 1988 <br />Monitoring Plan. <br />30 <br />