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1ZI 20/04 17:38 FA% 3032891348 L G EVERIST L.G. EVERIST, INC. Rock Solid Since 187G dba Andesite Rock Company RECEIVED December 17, 2004 Mr. Ross Bachofer 11566 Weld County Road 18 Fort Lupton, CO 80621 ~IEC 20 200~t Division of Minerals i£ Geology ~Gf/~J-O l f¢~ 002 MOUNTAIN DIVISION OFFICE 73ai E. esrH AvENUe • suITE zou HENOERSON, COLORAD080660 90.4287-8608 FAX 303299.1348 CORPORATE OFFICE 300 S. PHILLIPS AVE. • SUfTE 200 P,O. BOX 5829 SIOUX FALLS, 3D 57 7 7 7-5529 PHONE 6o6-33d-5000 FAX 605-33d-%56 RE: L. G, Everist, Inc: s Fort Lupton Sand and Gravel Mine Colorado DMG Permit # M-1999-12 ,Weld County Permit # USR-1255 Dear Mr. Bachofer. Thanks to you and Mike for taking the time th meet with Maureen Jacoby of Banks and Gesso and me to discuss our mine permit amendment application and your concerns. I apologize for not getting back to ycu sooner. First, we would like to address your concem with the amendment to our Colorado Division of Minerals and Geology permit The concem directed toward the state permit was in regards to your welt located on your property in the SW %of the NE % of Section 30, Township 2 North, Range 66, in Weld County. This property and well, which we saw when we met with you, is on the east side of the South Platte River, on the opposite side of the River from our operation. Just to let you know, we were unable to find any listing of this well in the Colorado State Engineer's permitted well records. You mentioned in your letter and when we met, that you are worried about drawdown to and contamination of your well by L. G. Everist, Inc.'s sand and gravel operation. We have since confirmed with a hydrologist what we explained in person -that the South Platte River acts as a barrier and that our operatlon will not affect groundwater levels on the opposte side of the River. The South Platte River is a perennial stream which flows through a fairly extensive alluvial deposit. Any drawdown of groundwater on the west side of the River would be replenished by the River, so there would be no impacts on groundwater level or groundwater quality on the east side of the River. The phenomenon of a river as a continuous boundary preventing effects from translating across it has been observed and is a widely accepted concept Therefore, with this in mind, we do not see how our operation could affect your well, so if we were to monitor your well, as requested, the monitoring would show effects from sources on the east side of the River, rather than from our operation. APthough you mentioned that you are not concerned about the wells you have on property located more than 1,000 feet to the west of amendment area, we would like to inform you that we are preparing a Groundwater Monitoring and Mitigation Plan for our Colorado Division of Minerals and Geology permit Second, we would like to address your concerns with the amendment to our Weld County permit: One concem is your well, which we have just addressed above. iAhotlier concern mentioned in your letter wa6 regarding asphalt plants. Our current permits include sand and gravel mining and processing, and concrete and asphalt batch plants. All asphalt plants in Colorado are regulatetl by the Colorado Department of Public Health and Environment's Air Pollution Control Division, and are required to have air pollution control devices known as baghouses. These baghouses are designed to contain the majority of emissions of air pollutants from asphalt plants, including much the odor that these plants used to emft years ago. If, however, sometime in the future, you do notice an ~ ee/CI liar-hnfnn1777nd (rnC