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CDPHE. The plan must also include proposed monitoring locations, frequencies, and <br />parameters; proposed equipment and protocol to be used when monitoring; proposed <br />reporting frequency and report content. In addition to various monitoring points, the plan <br />must also include proposed points of compliance and compliance standards that are set to <br />verify that the operation is.not adversely affecting off-site groundwater quality. <br />3. Please demonstrate that backfilling and the fines and 'naturals' in the trenches and <br />compacting to 90 percent of maximum dry density will be adequate to keep the <br />contamination plumes in place, but will not cause significant mounding upgradient of the <br />trenches, possibly forcing the contamination plumes to migrate north, east or west. Once <br />the appropriate trench backfill material and compaction density are verified, please <br />demonstrate that the specified compaction can be achieved with a bulldozer, as is proposed <br />in Exhibit L. <br />4. Please specify proposed, dewatering practices (if any), monitoring plans and/or mitigation <br />practices that will be adhered to during times when excavation has temporarily ceased while <br />stockpiles are being used up. <br />If you need additional information, please contact me at the Division of Minerals and Geology, <br />Grand Junction Field Office, 101 South Third Street, Room 301, Grand Junction, Colorado <br />81501, telephone no. 970-243-6368. <br />Sincerely, <br />.i~~~~ <br />Steve S. Shuey <br />Environmental Pr ion Specialist <br />Enclosure <br />cc: Mr. Greg Lewicki -Greg Lewicki and Assoc, w/encl <br />