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MOLEN & ASSOCIATES, LLC <br />ENVIRONMENTAL CONSULTANTS <br />2090 E. 104th Ave., Suite 205 ? Thornton, Colorado 80233 <br />Office 303-450-1600 ? Fax 303-452-4515 <br />June 18, 2010 <br />Mrs. Connie Davis <br />Aggregate Industries - WRC, Inc <br />1707 Cole Blvd., #100 <br />Golden, Colorado 80401 <br />Re: Broda's Inert Fill on Aggregate Industries Platte Valley Operations <br />DRMS Technical Revision for Installation of Groundwater Monitoring Wells <br />Dear Connie: <br />Attached is the map of the groundwater well locations and the well construction diagram. The wells <br />were installed on June 17, 2010 by Dakota Drilling. Well permit applications for the proposed wells <br />were submitted to the Colorado Division of Water Resources along with payments for the three wells. <br />Copies of the well permit applications are attached. The wells will be abandoned according to the <br />Colorado Division of Water Resources Rule 16 after they are no longer needed, at least 10-20 years <br />from now. A copy of a blank Well Abandonment Report is attached. A check for $216 made out for <br />the Division of Reclamation, Mining and Safety is enclosed. <br />The three wells will be used for routine groundwater monitoring at the Broda Inert Fill on Aggregate <br />Industries Platte Valley Operations. Groundwater in the wells will be monitored for the constituents <br />listed in Appendix IA and IB in the Regulations Pertaining to Solid Waste Sites and Facilities, or a <br />shortened list, and at a frequency, all agreed to by the Colorado Department of Public Health and <br />Environment (CDPHE) and Weld County. It is expected that the wells will be monitored quarterly for <br />two years and then at a lesser frequency (once or twice per year) until the Broda fill operations are <br />completed. <br />Copies of the groundwater monitoring reports will be sent to DRMS at the time they are being <br />submitted to the other regulatory agencies within 60 days after receiving the laboratory report. I have <br />discussed this information with Patrick Broda and he is in agreement. <br />Please process the Technical Revision as soon as possible so we can keep on track with installing the <br />groundwater monitoring wells as soon as possible. <br />Yours truly, <br />MOLEN & ASSOCIATES, LLC <br />Mark A. Molen <br />cc. Patrick Broda, Broda's Inert Fill