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i August 31, 2005 P Mr. Ed P. . Duggan P. O. Box 340 Windsor, CO 80550 AGGREGATE Re: East 8"' Street Operation - Gravel Mine Well Permit INDUSTRIES Dear Mr. Duggan: Aggregate Industries (AI) has applied to the State Engineers Office (SEO) for a well permit for its sand and gravel mine known as the East a Street Operation and located southeast of the intersection of East 8'b Street and Ash Avenue. A copy of the application is enclosed for your review. While we do not anticipate that our operation will impact your well, we understand you may have concerns regarding any potential impact. In order to address concerns regarding potential impacts from its operations on neighbor groundwater levels, Al has implemented a groundwater management program. This program includes two monitoring wells that were installed along the north border of the site in April, 2003 to assist in evaluating any, potential operational impacts on groundwater levels. Water levels in these wells have been measured on a monthly basis since installation, which provides more than two years of pre-mining baseline information against which future active mining measurements can be compared. If Al is advised by a neighbor that they are experiencing a problem with their well, then Aggregate Industries will evaluate the cause based upon groundwater data obtained through the monitoring program, the location of the neighboring well in relation to mining activity, and regional weather and land use conditions. If mining activity is determined to be a significant contributing factor to groundwater changes requiring mitigation, Al will implement mitigation measures. The following is a list of mitigation measures that may be implemented: 1. Modify existing wells to operate under lower groundwater conditions. This could include re- drilling existing wells to deeper depths or lowering the pumps. All work would be done at the expense of AI with the exception of replacing equipment that was non-functional prior to mining. 2. If existing wells cannot be repaired, AI will drill a new well within 200 feet of the existing well for the owner to replace the damaged well. The new well will produce water of the same quantity and quality to support the historic use. 3. Provide an alternative source of water to support the historic well water use. The above listed mitigation measures are not intended to be all-inclusive. Al is committed to working with you to provide an acceptable alternative source of water to support historic use without additional expense to you. AI shall be responsible for any costs associated with any mitigation measures or monitoring it undertakes, including, but not limited to, fees and costs Aggregate Industries West Central Region, Inc. 1707 Cole Blvd., Suite 100 Golden, CO 80401 Telephone: 303-485-1070 An Equal Opportunity Employer