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r <br />,., <br />Lincoln DeVore,lnc. <br />Geotech nical Consultants - <br />1000 West Fillmore St. <br />Coloratlo Springs, CO 80907 <br />(303) 632-3593 <br />Wyoming Fuel Company <br />445 Union Blvd., 11310 <br />Lakewood, CO 80228 <br />October 1, 1965 <br />Re: Percolation Test, New Elk Mine, Route 12, <br />Las Animas County, Colorado <br />Dear Mr. Magnussen: <br />The attached percolation test has been completed using the <br />follor~ing procedure. This letter references the EPA method of <br />conducting a percolation test. <br />Summarizing the preparation instructions in this method, the pro- <br />. cedure was as follows: <br />1. Borings were drilled to the depth shown on each individual <br />test result (approximately depth of field). The sides of the <br />borings were roughened. <br />2. Perforated PVC pipe was placed in the boring to hold it open <br />and to provide a measuring point. <br />3. Twelve inches of water was placed in the boring. <br />a. If the water seeped away rapidly, 12" more water was <br />placed in the boring. If this seeped away within 10 <br />minutes, the percolation test was performed immediately. <br />b. If the water did not seep away rapidly (as in a. above), <br />the hole was saturated for a minimum of 12 hours. <br />4. The water level was adjusted to a depth of 6 inches and the <br />seepage rate measured to the nearest 1/16". Time of mea_ure- <br />ment was 30 minutes. <br />The results of the percolation tests are on the attached sheet. <br />The usual range for a passing percolation test is between 10 and <br />60 minutes per inch. <br />Respectfully submitted, <br />LINCOLN-peV ~ ~IN~ <br />By os/~l///R/~Winston <br />Engineering Geologist <br />JRW/sc <br />LD Job No. 58305 <br />APPEVDI`C ;10. 1 <br />Reviewed by: <br />i~ <br />//~~~~~ <br />,nthony Belfast, P.E, <br />Geotechnical Engineer <br /> <br />