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TETRATEGH RMC April 2, 2004 Mr. Mike Refer Aggregate Industries, Inc. 1707 Cole Boulevazd, Suite 100 Golden, Colorado 80401 Re: Well Inventory, Hazeltine Aggregate Site Near Henderson, Colorado; Tetra Tech RMC Job No. 19-3919.018.00 Dear Mike: This letter report presents the results of our well inventory for the proposed Hazeltine Aggregate Mine near Henderson, Colorado. Aggregate Industries (AI) is in the process of applying for a permit to extract gravel at the Hazeltine site. Reconnaissance of the site and adjacent areas indicated the presence of numerous, shallow, domestic wells. Review of well records on file with the Colorado Department of Natural Resources, Office of the State Engineer (SEO) also confirmed many domestic wells are present near the site. Experience has shown that the SEO domestic well files are not complete. Consequently, AI conducted a well inventory to identify, to the extent practical, domestic wells near the proposed site. The search area of the well inventory was 1,500 feet from the property boundary. This distance was chosen because impacts to groundwater levels are expected to be limited to within 1,000 to 1,200 feet of dewater cells. The distance of 1,500 feet was chosen to be conservative. Wells identified during the inventory are summarized in Table 1. Table 1 is subdivided into two sections (A and B), by distance: wells within 600 feet of the property boundary are summarized in Table 1-A, and wells between 600 and 1,500 feet of the properly boundary are summarized in Table 1-B. The approximate locations of the wells are shown on Figure I. WELL INVENTORY The well inventory process consisted of several key elements which are described below. A letter and questionnaire were prepared for delivery to all residences within the inventory area. Copies of the letter and questionnaire are provided in Appendix A. The letter and questionnaire, along with a self addressed postage paid envelope, were hand delivered to each residence in the inventory area. The letters were delivered during the first week of November 2003. If a resident was home when the letter was delivered, the Tetra Tech RMC representative interviewed the resident to complete the information on the questionnaire. If [he resident was not home, the information was Left on the door knob or other conspicuous place. 1900 S. Sunset Street, Suite !-F, /.ongmont CO 80501 Tel 303.772.5282 Faz 303.665.6959 wwv~.ttrmccom