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ROCKY MOUNTAIN CONSULTANTS, INC. <br />Inc <br />Jufy 7, 1998 <br />Mr. Kim Lawrence <br />Lind, Lawrence and Ottenhoff, L.L.P. <br />The Law Building <br />1011 Eleventh Avenue <br />Greeley, Colorado 80631 <br />Re: Application for Substitute Supply Plan for the Shores Pit <br />Dear Kim: <br />Premiere Building <br />825 Delaware Ave., Suite 500 <br />Longmont, CO 80501 <br />(303) 772-5282 <br />McTro (303) 665-6283 <br />FAX (303) 665-6959 <br />E-mail rmclong~rmii.com <br />As requested by Hall-Irwin Construction Company (Hall-Irwin), we are submitting to you our report for <br />the Shores Site Substitute Supply Plan. <br />1. <br />The Hall-Irwin Shores site is located approximately three-quarters of a mile east of I-25 and north of <br />Weld County Road 24 (Section 1 and the East One-Half of Section 2, Township 2 North, Range 68 <br />West, 6th Principal Meridian, Weld County, Colorado). A vicinity map is included in Appendix A. <br />The permit boundary encompasses about 125 acres. <br />There is an estimated eight million tons of sand and grave{ on this site. Annua{ production will be <br />dependent on the market demand. Assuming an annual demand of approximately 320,000 tons of <br />sand and gravel, mining will take 25 years to complete. <br />A geotechnicai engineering exploration of the site was performed in September and October of 1997 <br />by Terracon Consultants Western, Inc. Nineteen test holes were drilled to approximate depths of 20 to <br />40 feet below the ground surface. Logs of the test borings showed the depth to groundwater varied <br />from four to six feet below the ground surface. Copies of the logs can be provided upon request. <br />This substitute supply plan addresses the initial mining sequence anticipated at the Shores site. A <br />mining plan has been enclosed showing the proposed sequence for sand and gravel removal. As <br />shown in the mining plan (Appendix B), the sand and gravel will be removed in eight sequential <br />sections commencing at the southwesterly end of the site and progressing in a northeasterly direction. <br />This plan describes the removal of sand and gravel from the first two sections. It is estimated that it <br />will take up to five years to remove the sand and gravel from the first two sections. <br />During mining of the first six sections, the only groundwater exposed will be in the dewatering trench <br />and collection system surrounding the pit. At the time the sand and gravel has been removed from the <br />_ westerly lake (Sections 1_through 6), groundwater will be exposed in the lake and full evaporative - <br />tosses associated with the 82.8 surface acres will have to be replaced. <br />CIVIL AND ENVIRONMENTAL ENGINEERING .PLANNING <br />