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<br />/ <br /> <br />~r....~ ~ . & ro. I <br />.' rraSler u/flgery, ine. <br />~ CONSULTING ENGINEERS <br />~. 2UO SOUTH VALLEJO STREET. <br />. ENGLEWOOD, COLORADO 80lJO <br />TELEPHONE 303 161-4860 <br /> <br />August 21, 1973 <br /> <br />Mr. John Henry Van Dis <br />Marble Ski Area, Inc. <br />Box 56C <br />Star Route <br />Carbondale, Colorado 81623 <br /> <br />Re: Mt. Daly Drainage <br />Job No. 661.01 <br /> <br />Dear John: <br /> <br />This letter is to reiterate our recommendation for <br />the two proposed interceptor drainage ditches on Mt. Daly as <br />discussed in our letter of July 23, 1973. Based on the field <br />investigation completed August 13 and 14, we feel the best <br />location for these ditches is as staked in the field, tying <br />into the existing ditch and trail alignments where possible. <br /> <br />At this time, it would be expedient to begin con- <br />struction of the ditches and complementary structures. The <br />ditches should be on approximately a 3% grade and should dis- <br />turb the natural vegetation as little as possible. It is <br />recommended that the ditch alignment be wide enough to per- <br />mit access to the total length of the ditch by a wheeled or <br />tracked vehicle to facilitate maintenance. <br /> <br /> <br />The upper ditch, located above the Marble Village <br />Inn will require two interceptor ditch diversion structures <br />located on the two streams draining the upper ski area by <br />the water-bar network. A typical design for this structure <br />is shown on the attached drawing. Other tributaries to the <br />ditch should be well armored with riprap which will remain <br />stable during periods of above-normal flow. The outfall from <br />the ditch will be a corrugated metal pipe running downhill <br />from the end of the interceptor ditch located just off the <br />south edge of the main ski trail. A typical design for this <br />facility is also attached. At this time, the pipe can be <br />extended to a point directly below the access road to the <br />Village Inn. <br /> <br />The lower Schindel Haus interceptor ditch should <br />begin at the downstream end of the 42" CMP directly east of <br />the Schindel Haus. The alignment of this ditch has been <br />located in the field and should tie into the existing trail <br />, <br /> <br />CIVil ENGINEERING I <br /> <br />I STO'M e''1'NAGE <br /> <br />I <br />T~' <br /> <br />I STRUCTURAL I TRANSPORTATION / WATER: a. SANIU.TION <br /> <br />LAND SURVEYING <br /> <br />i <br />\ <br /> <br />, <br />, <br />