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10!29/2003 15:37 3037764355 FLATIRONS LDNGMONT PAGE 02 <br /> <br />Flatirons Surveying, lne. <br />655 Fourth Avenue <br />`' Longmont, CO 8050/ <br />F LE <br />October t 6, 2003 <br />Carl 8. Mount <br />Senior Eaviratrmenrel Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street. Room 215 <br />Denver, Cobrado 80203 <br />.. ri <br />RE: DLtRF{AM SAND & GRAVEL P1T - PERMIT NO. M -1978-056 FS1 JOB NO.45071 ,$-¢rac~4reSlS~+6r~ Y <br />Clessr iZevrsiorl ~Pe-S~& r ~9nf-! <br />Dear Mr. Mount: <br />1 did anon-sire inspection and evaluated the stability of the perrrmrtent roan-made strutKUres and facilities located <br />within 100 feet of the rcferetrced sand and gravel thine. These swctutes a>td facilities include houses, outbuildings, <br />overhead and underground utilities located within dte 16'" Sweet tight of way, domestic water wells and oo site <br />oiUgas wells with underground piping and storage tanks. These structures and facilities are located on the Protection <br />of Existing Faciliries Exhibit map prepared by Flatirons Surveying, loc. The map identifies a 10 feet rto excavation <br />buffer adjacent to the mine boundary limits. The buffer will also maintain existing ofF--sire drainage conveyance <br />patterns away from existing structures or facilities. The proposed cxcavatioa slopes of 1.25 to one ate stable for the <br />sire's alluvial material. Minirmrrrt stockpile surcharge will be placed on the buffo 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 cxcavarion slopes. The existing <br />underground oil/gas pipelines wiU be protected with a stockpile buffer or rclocered outside of the excavation limits. <br />Utilizing these mitring inedtods will maintain the imegriry of the existing structures and facilities located vnthin 200 <br />feet of the mining operations, and will have no adverse effects on these features. <br />If you haws any questions or need additlottal infurmatioo concerning [his engineering evaluation-please conmc[ rrc. <br />Sincerely, ~~ <br />FLATIRONS SURV£`lil~~ilNiC.n_~ `Ilw <br />~Q K <br />Bruce F. <br />cc: Brad J. Janes, <br />Via Fax 970.: <br />0FE/tv <br />~~.+.~~ <br />Phone (303)7761733 www.flarsurv.com Fu (303)7764355 <br />