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OC7-31-2005 1133 <br />1_T VI:'1N <br />tir:~~a <br />Itic <br />LYNAN HEtJN INC. 303 534 1777 P.02 <br />ENGINEERING SOLUTIONS FROM THE GROUND DOWN <br />31 October 2005 <br />File No.105056-000 <br />Banks and Gesso, LLC <br />720 Kiplirrg St„ Suite 117 <br />Lakewood, CO 80215 <br />Attention: Mr, Aiex Schatz <br />Subject: Geotechnicai Stability Analysis <br />Proposed MMRR Quarry <br />Gilpin County, Colorado <br />Dear Alex: <br />Reference is made to our letter to you dated 19 August 2005. In that letter, Lyman Kenn provided a geotcchnicat <br />stability analysis for permanent manmade structures that exist within 200 ft of the affected area. The list of <br />structures did not include the detention pond and easternmost building of the Black Hawk Central City Sanitation <br />District (BHCCSD), both of which arc believed to be beyond the 200 R perimeter of geotechnical concern under <br />DMO Rules. <br />The conclusions of the original stability analysis also apply to the referenced BHCCSD structures. Based on <br />engineering analysis of site geometry and blast vibrations (designed and monitored for PPV of less than 0.7S ips), <br />the structures will not be damaged by proposed mining operations. <br />It has been a pleasure serving you on this project. Please contact the undersigned if you have any questions or <br />comments, .. - -. <br />Sincerely yours. <br />LYMAN IiENN FNC. <br />Steven C. ICttehr, P•L~O~~t a 131 <br />Associate `s,F.._ <br />Attachments <br />G:~VIOIHCfS\10]076000 MMPA WutY Co~+M1~wV~ll RwmhVetta IOdI- <br />07.006 <br />1 10 16Th Scrarc. Suite 900 -~ penver. CcJ 80202-5202 -Tel: 303.534. r I CO - f ax• 303.:34. i i77 - www.Lyln~nHenn.cortl <br />Groterhnieuf. lirngefinq and Cbnstn:ctmi services <br />TOTRL. P.02 <br />