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<br />Flatirons Surveying, Inc. <br />655 Fourth Avenue <br />Longmont, CO 80501 <br />October 16, 2003 <br />Carl B. Mount <br />Senior Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colotado 80203 , <br />RE: DURHAM SAND & GRAVEL PIT -PERMIT NO. M -1978-056 FSI JOB NO. 45071 <br />Dear Mr. Mount: <br />I did an on-site inspection and evaluated the stability of the permanent man-made structures and facilities located <br />within 200 feet of the referenced sand and gravel mine. These structures and facilities include houses, outbuildings, <br />overhead and underground utilities located within the 16" Street right of way, domestic water wells and on site <br />oil/gas wells with underground piping and storage tanks. These structures and facilities are located on the Protection <br />of Existing Facilities Exhibit map prepared by Flatirons Surveying, Inc. The map identifies a 10 feet no excavation <br />buffer adjacent to the mine boundary limits. The buffer will also maintain existing off-site drainage conveyance <br />patterns away from existing structures or facilities. The proposed excavation slopes of 1.25 to one are stable for the <br />site's alluvial material. Minimum stockpile surcharge will be placed on the buffer to insure the excavation slope <br />stability. <br />The on site oiUgas wells will be protected with a buffer and the 1.25 to one excavation slopes. The existing <br />underground oil/gas pipelines will be protected with a stockpile buffer or relocated outside of the excavation limits. <br />Utilizing these mining methods will maintain the integrity of the existing structures and facilities located within 200 <br />feet of the mining operations, and will have no adverse effects on these features. <br />If you have any questions or need additional information concerning this engineering evaluation, please contact me. <br />Sincerely, <br />FLATIRONS SURVEYING, 00 REGIS <br />P <br />Bruce F. Erickson, P.E. <br />00752 <br />cc: Brad J. Janes, Vara 'vies ; <br />Via Fax 970.353.404 ?.<FSSmNALE??\? <br />BFE/tv <br />Phone (303)776-1733 www.flatsurv.com Fax (303)776-4355