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May 21, 2013 Mr. Eric Fenster, Esquire Technical Review Comments: Application for Certificate of Designation, Proposed Henderson Inert Landfill, Adams County, Colorado Page 5 monitoring system will be thirty (30) years unless the Division approves a request by the Henderson Inert Landfill to decrease the period in accordance with Section 3.6.3 of the Solid Waste Regulations. The Division requires the initially approved post - closure care period to be no less than thirty (30) years for all aspects of post - closure care. Pursuant to the provisions in Section 3.6.3 of the Solid Waste Regulations, the post - closure period can be increased or decreased by the Division after consultation with the local governing authority. A request for such a modification to the post - closure care period typically would be made during the post - closure care period, and would be based on operating history, ground water monitoring data, and other pertinent site - specific information. 7. For Section 11.1 (Closure Financial Assurance), Section 12 (Post- Closure Financial Assurance), and Attachment 7 (Henderson Inert Landfill Closure and Post - Closure Cost Estimates) of the Plan (Tarry 2012), please note the following: • The Division requests that, with the final submittal, the Henderson Inert Landfill submit closure and post - closure care costs separately, though in the mean time the Division can review the costs already submitted and provide comments as necessary. • Please contact Division Financial Analyst Enrique Martinez (303- 691 -4054, Enrique. Martinezna,state.co.us) to coordinate review of the closure and post - closure care costs and the establishment of financial assurance. 8. Section 13.8 (Fees) of the Revised Plan (Tarry 2013) states that the Henderson Inert Landfill will pay the Solid Waste User Fee (see Section 1.7.4 of the Solid Waste Regulations) on a quarterly basis based on the amount of fill, using accurate accounting records, accepted during the quarter. The Solid Waste User Fee is due one month after the end of each quarter. A form for the use of the Henderson Inert Landfill in preparing the quarterly fee can be found at the Division's web site here: h=://www.colorado.gov/cs/Satellite/CDPHE-HMCBON/1251616360987 Click on the Solid Waste User Fee tab, then click on the Non -NPL Sites form (i.e., the upper link) to download the form and start using the Microsoft Excel spreadsheet. Within thirty (30) calendar days of the receipt of this letter, please submit for Division review a Revised EDOP that addresses the comments referenced above. The Division is authorized to bill for its review of technical submittals at $125 per hour, pursuant to Section 1.7 of the Solid Waste Regulations. An invoice for the Division's review of the subject document will be sent under separate cover. Should you have questions, please contact Doug, Eagleton at 303 - 691 -4065, Dou lag s.Ea leg ton(2state.co.us, or Roger Doak at 303 - 692 -3437, Roger.Doakgstate.co.us.