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TETRATECH RMC Mr. Mike Refer Apri12, 2004 Page 2 Approximately 130 residences/businesses received the inventory letters. Responses began arriving at Tetra Tech RMC within about one week of delivery. As ofmid-February, Tetta Tech RMC had received 18 responses from residents. Information from the questionnaire was input to a Microsoft Access Database. Locations of wells identified from the questionnaires were matched to the street address and plotted on Figure 1. Copies of the completed questionnaires are provided in Appendix B. The SEO well database was also searched to obtain information on existing wells. The locations of many of the wells are given by address and/or quarter quarter of the Section, Township, and Range. When possible, the locations of the wells were then matched to residential addresses. If a well could not be matched to an address, it was plotted in the center of the quarter quarter section. Wells located in this fashion are indicated on Figure 1. Available well permit information on file with the SEO was obtained for wells located within the inventory area. Copies of the well permit files are provided in Appendix C. RESULTS The well inventory identified a total of 75 wells, 34 of which are within 600 feet of the site boundary. Information on the total depth of the wells was available for 70 of the 75 wells. Water level information was available for 56 of the wells, and 60 pumping rates were available for the inventoried wells. The available data indicates that wells range from nine to 751 feet deep with water levels ranging from three to 545 feet deep. Eleven wells are completed at a depth of 20 feet or less, with depths to water of three to nine feet. Four wells are less than or equal to 10 feet deep. Two of these shallower wells are within 600 feet of the permit boundary. RECOMMENDATIONS Owners of all wells within 600 feet of extraction cells should be contacted. If the owners indicate that the wells are in use, measurements of well depth, pumping rate, pumping water level, and non- pumping water level should be made prior to mining. The locations of these wells should be surveyed far elevation and horizontal location. Additionally, to establish a baseline, water levels in these wells should be measured at least once prior to mining, Figure 1 shows the locations of existing monitoring wells. The water levels in the monitoring wells should be measured monthly until mining begins. After mining begins, water levels should be monitored quarterly until reclamation is complete and the Colorado DMG releases the financial warranty bond. We anticipate the public hearing will yield more information on wells. This well inventory should be updated if additional well owners or additional well information becomes available during the permit process.