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October 6, 2006 Marilyn Kent f~EV ~ ~~~~ 16400 Tucson Street INDUSTRIES Brighton, CO 80601 Re: Tucson Sand and Gravel Mining Operations -Groundwater Impacts Dear Marilyn: Thank you for taking time to meet with Aggregate Industries' plant manager Lu Toxvazd and me on Friday, September 29 regarding your water well. This letter is provided as a summary of recent mining activifies related to your well and Aggregate Industries' commitment to continue mitigation efforts to maintain your water supply. As Aggregate Industries' mining operations resumed earlier this year, you contacted Lu and advised that you were experiencing a drop in the water level in your well. In response, a recharge pond was established along the border between our propert[es in an effort to maintain groundwater levels sufficient to provide a steady supply of water to your well. This effort initially appeazed to help, however pumping of water from the pond during the irrigation season, coupled with additional impacts that are occumng as mining activity at the Challenger site to the west has progressed south and across from your property, has at times dropped the water in the pond and reduced its groundwater recharge efficiency. In an effort to mitigate for the insufficient groundwater recharge, you advised that a new submersible pump was being provided to you, and installed at a lower level in the well, by the operator of the Challenger mine. As discussed last Friday, Aggegate Industries was unaware that you continued to experience a problem with obtaining water supplies sufficient for your needs following installation of the new pump. _ Having been made awaze of the continuing problem, Aggregate Industries has considered additional mitigation options. Primarily, a higher water level will be maintained in AI's pond to the east of you to provide better goundwater recharge. The pond water level will be monitored as part of the regulaz inspection routine at the plant, with additional water to be pumped to the pond if necessary. As mining resumes and progresses next year, the size of the pond will also be increased to provide a greater area of recharge. We also discussed routing a line to pump additional water to you as necessary. As you pointed out, running a water line is not a viable option at this time as the line would likely freeze, Aggregate Industries west central Region, Inc. Connie N. Davis, Land Resources 1707 Cole Blod., Sulte 100 P. O. Boz 337231, Greeley, CO 50633 Golden, CO 80401 (970) 336-6526 Telephone: 303-985-1070 ~ An Equal Opportunity Employer