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<br />...".-. <br /> <br />i!;.~\ F=ier & Ginger;: Ine. <br /> <br />i. :' :E;JEi~7~~~~g,1;l! <br /> <br />.'~' TELEPHONE 303 761-4860 <br /> <br />July 23, 1973 <br /> <br />Mr. Charles Kelly <br />Box 56C <br />Marble Star Route <br />Carbondale, Colorado <br /> <br />81623 <br /> <br />Re: <br /> <br />Marble Ski Area - Schindel Haus Drainage <br />Preliminary Sche~e - Job No. 661.01 <br /> <br />.' <br /> <br />Dear Mr. Kelly: <br /> <br />Members of our staff examined the land in the vicinity <br />of the Schindel Haus during a field trip to the site on Friday, <br />;. .~July 20, 1973. The geologic and soils investigations have been <br />studied in detail and the existing topographic mapping has been <br />examined. ..,. . <br /> <br />The drainage problem in the vicinity of the Schindel <br />Haus appears to result from a combination of three pre-existing <br />conditions in the area: (1) the underlying Mancos shale is not <br />highly metamorphose in this area, thus it is more subject to <br />erosion and subsidence than in other areas on the Marble <br />property; (2) surface runoff is eroding the soft soils and <br />weathered bedrock on the surface; and (3) ground water is con- <br />t~ibuting to hills lope creep by lubricating bedding planes in <br />the bedrcck. This problem is compounded by the high gradient <br />and therefore high velocity of Carbonate Creek which has cuts <br />deeply into the bedrock formations west and southwest of the <br />Schindel Haus. This deep ravine permits slumping and slough- <br />ing of bank materials and the stream rapidly carries off the <br />debris, thereby facilitating further slumping. <br /> <br />A solution which we believe will eliminate most of <br />the surface runoff 'and which will reduce the amount of ground <br />water in the bedrock is the placement of an interceptor ditch <br />eas~ of the Schindel Haus below the road and flowing in a <br />northerly direction to Carbonate Creek. This installation is <br />. <br />. shown.'schematically on the attached sketch. The purpose of <br />this collector ditch would be to intercept and channel surface <br />runoff.presently tributary to the problem area and direct it <br />to an outfall point north of the site. By decreasing the <br />amount of surface water available for infiltration, the amount <br />of infiltration and hence the amount of ground water will also' <br />be.. reduced b.y the interceptor ditch. <br /> <br />CIVil FNr.IN1:FCI'INr.. I I ANn :C;llRVEYINc; I STnRM nl14.INAG1= I 5TRtJr:TlIA'..4.l I TRANSPORTATION I WATER A. SANITATION <br /> <br />, <br />! <br />. <br /> <br />