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<br />Flatirons Surveying, Inc. '~ <br />655 Fourth Avenue <br />Longmont, CO 80501 <br />,Fxh. S / <br />I~i'n-l / <br />l~Crrrc~ Cm~?~~ <br />October 16, 2003 <br />Ir3le~is:.u~ i~t-: <br />Carl B. Mount 2 O 2003 / <br />Senior Environmental Protection Specialist ~CT <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 Division of Mine7aVs and Geolc~" <br />Denver, Colorado 80203 / / <br />RE: DURHAM SAND & GRAVEL PIT - PERMIT NO. M -19718/-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'" Sheet right of way, domestic water wells and on site <br />oiUgas wells with underground piping and storage tanks. These stmctures and facilities are located on the Protection <br />of Existing Facilities Exhibit map prepared by Flatirons Surveying, Inc. The map identifies a ] 0 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 surchazge 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 oiUgas 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 stmctures 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 [his engineering evaluation, please contact me. <br />Sincerely, _ _ _ _ ~__ _ __ _ <br />FLATIRONS SURVE~~~ (,. <br />F. Erickson~.E.~ 30'752 <br />cc: Brad J. Janes, <br />Via Fax 970.3 <br />BFE/tv <br />Phone (303)776-1733 www.flatsurv.com Fax (303)776-4355 <br />