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when the pumps are turned off is there an increase in the potentiometric head of the DS Aquifer that could <br />compromise the quality of the A-Groove aquifer? <br />6) How often is cavity pressure and DS aquifer potentiometric head readings observed during active solution <br />mining? Also, what steps are taken in the event that high cavity pressures are observed? <br />The technical revision cannot be approved until the issues are adequately addressed. Please submit a response to <br />the issues as soon as possible but no later than August 20, 2010, so the decision date of September 8, 2010 can be <br />met. If your response, or a written request for an extension of the decision date, is not received by August 20, <br />2010 then the request: for the revision may be denied. <br />If you need additional information, please contact me at the Division of Reclamation, Mining and Safety, Grand <br />Junction Field Office, 101 S. 3rd St., Suite 301, Grand Junction, Colorado 81501, telephone no. 970.241.2042. <br />Sincerely, <br />Travis Marshall <br />Environmental Protection Specialist <br />Cc: Steve Shuey, DRMS <br />David Bird, DRMS <br />Paul Daggett, BLM White River Field Office <br />Jerry Daub, Daub and Associates, Inc.