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TETRA TECH Page 3 of 3 <br />*EW, Mr. Peter Hays <br />June 6, 2011 <br />Comment from Second Adequacy Review letter: <br />The Division prepared a preliminary reclamation cost estimate for the Iverson Pit. The Division <br />estimates the total cost to reclaim the site is $233,400. The estimate is based on the Applicant <br />choosing Option C above and will require recalculation if a different option is chosen by the Applicant. <br />A copy of the estimate is enclosed for your review. <br />Lafarge will probably proceed with Option C, to provide the Division with documentation from the <br />SEO, which demonstrates the Applicant owns a sufficient amount of shares of water to cover the <br />evaporative losses from the exposed groundwater and the said shares have been committed to the <br />SEO should the financial warranty be forfeited and the permit revoked. We are awaiting <br />documentation from the SEO to satisfy this documentation requirement (Attachment F). In addition, <br />Lafarge reviewed the cost estimate prepared by the DRMS and they find it acceptable. <br />37. Please clarify if Lafarge is continuing to pursue signed structure agreements with TowerCo, City of <br />Greeley and Boyd Irrigation Company or if the Applicant is relying on the engineering evaluation to <br />demonstrate the structures will not be damaged by mining activities. <br />Lafarge would like to rely on the engineering evaluation to demonstrate that TowerCo's, the City of <br />Greeley's, and the Boyd Irrigation Company's structures will not be damaged by mining activities. <br />39. Please provide the Division with stockpile and tower surcharge loads and document the source of the <br />surcharge loads used in the revised slope stability analysis for the communication tower so the <br />Division can duplicate the cross section for verification. <br />The stockpile and tower surcharge loads are 1,100 and 3, 000 pounds per square foot respectively. <br />This information has been added to the model (see Attachment F). <br />Thank you for your consideration. Please contact me if you have any questions regarding our responses. <br />Sincerely, <br />TETRA TECH <br />Pamela Franch Hora, AICP <br />Senior Planner <br />Attachments: <br />Attachment A: Exhibit C <br />Attachment B: Exhibit D <br />Attachment C: Exhibit E <br />Attachment D: Exhibit F <br />Attachment E: Notarized letter from Mr. and Mrs. Iverson <br />Attachment F: Stockpile and Tower Surcharge Load Information <br />cc: Anne Johnson, Lafarge West, Inc.