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Lang maps show one island in the pond currently known as Pond #2. However, <br />Terracon's proposed reclamation plan map shows two islands in the same pond. <br />Rule 6.4.7 Exhibit G- Water Information <br />17. The Division received comments from the Office of the State Engineer (OSE) <br />regarding the proposed application. According to the OSE, before a well permit can be <br />approved the applicant must conduct a field location of the site and document the <br />locations of all wells within 600 feet of the permit area. The applicant must then obtain <br />a waiver of objection from all well owners with wells within 600 feet of the permit area <br />or request a hearing before the State Engineer. See the attached OSE letter for further <br />detail. Please commit to not further exposing groundwater until a well permit is <br />obtained from the OSE. In addition, once the well permit is obtained a copy must be <br />submitted to the Division. <br />18. Please submit information that cleazly defines the gaining and/or losing nature of St. <br />Vrain Creek in the vicinity of the permit azea; this information must be prepazed by a <br />professional hydrologist or other qualified professional. <br />19. Please clarify the estimated average depth of the slurry wall. It appears from the boring <br />data provided in the amendment application that the average depth from the surface to <br />key in to bedrock is approximately 27 to 28 feet, rather than the 16 feet mentioned on <br />page one, #2, of Exhibit E. <br />20. Please explain how the operator will address areas of substantially coarser materials <br />such as gravels and cobbles coupled with the site's water table. Please provide a <br />discussion of slurry wall construction techniques that will be employed for the azeas of <br />gravel and cobble penetrated by boring numbers 1 and 8. <br />21. Please provide clarification of potential solutions to permeability issues arising as a <br />result of the intersection of the utilities' pipes (i.e. the water main in the berm between <br />current ponds 2 and 3, also any gas and sewer lines) and the proposed slurry wall. <br />Rule 6.4.10 Exhibit J- Vegetation Information <br />22. Knapweed (a State listed noxious weed} appears on the southwestern side of the <br />current middle pond. Please submit a weed control plan per Rule 3.1.10(6). Please <br />- "provide a weed control plan to be implemented in the event ofa noxious weed problem <br />on site. This plan should be developed in consultation with the county extension <br />agency, or weed control district office, and should include specific control measures to <br />be applied, a schedule of when the control measures will be applied, and apost-spray <br />monitoring plan. <br />3 <br />