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Mr. Jack Varra <br /> Page 2 <br /> April 23, 1974 <br /> The maximum size aggregate found was 1 1/2 inch. In all cases , more than <br /> 50 percent by weight passed the number 4 size seive. The samples were <br /> identified by the Uniform Soils Classification System using the method <br /> of coeffecients of uniformity and curvature. Using this method, the samples , <br /> for the most part are classified as a well graded sand. Gradation analysis <br /> and curves accompany this report. <br /> The Specific Gravity (saturated surface dry) of the +4 fraction is 2.65. ..,' <br /> Specific Gravity (saturated surface dry) of the -4 fraction is 2.68. The <br /> soundness test, using a solution of sodium sulfate revealed an average loss <br /> after 5 cycles of 2.75 percent. <br /> A sample of aggregate which was seived through the number 4 screen was sent <br /> to a gold assayer for analysis. The sample weighi: was 7 pounds , 10 ounces <br /> and contained .04 milligrams of gold. <br /> CONCLUSIONS <br /> As previously stated, the samples obtained were composed, predominately, of <br /> igneous rocks. This is a very desirable quality since most igneous rocks <br /> are excellent aggregates , being normally hard, tough and dense. This is <br /> borne out in the subject samples by the Specific Gravity and low percent of <br /> loss shown in the soundness test. The sand and gravel conglomerates should <br /> be readily reduced during crushing operations to their nominal sizes . <br /> The samples in their native state do not meet standard gradation specifications <br /> for use as concrete aggregates , bituminous paving mixtures , or highway base <br /> course. It will require a manufacturing process to alter the stone sizes <br /> to meet requirements as outlined by most specifications. <br /> The PUD Reclamation Standards are shown on the accompanying site plan which <br /> indicate mining limitations , land stabilization , air quality and reuse of <br /> the site. <br /> If there are ar:v questions , please contact this office. <br /> Respectfully, <br /> NELSON, HALEY, PATTERSON and QUIRK, INC. <br /> William P. Leady <br /> Materials Department <br /> WPL/bn <br /> cc: Robert Britzman <br />