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<br />I ~~ Climax Molybdenum Company <br />September 22, 1961 <br />Page 4 <br />PRODUCT DATA <br />l~dward-Clyde Consultants. <br />During our conversations with each of the manufacturers of the six selected <br />dust suppressants, we obtained the following. product information: <br />1. Coior .. _ = . . <br />2. pH <br />3. Recommended dilution with water - <br />4. Recommended application rate - <br />5. Recommended storage temperatures (minimum - maximum) <br />6. Freeze-Thaw stability <br />7. Estimated working life <br />8. Concentrate cost - - <br />9. Density (concentrate) <br />10. Recommended field equipment <br />11. Recommended mixing requirements <br />12. Manpower required <br />13. Other product information <br />Table III presents the product data obtained from the manufacturers. <br />ECONOMIC ANALYSIS <br />All of the dust suppressant manufacturers we contacted recommended using <br />a power spray unit and one man per unit to apply the dust suppressant <br />solution. Because of this, we believe the selection of dust suppressant, <br />based on economics alone, can be made knowing the cost of the various con- <br />centrates, their recommended dilutions with water, and their recommended <br />application rates. We understand you currently use a 2800-gallon tank with <br />your spray unit and make about 12 trips per 8-hour day (4200 gallons/hr) <br />covering an area of about 1300 feet by 60 feet per trip (8670 yd2). Cost <br />of the spray unit and operator is about $60 per hour. Using these values <br />and the concentrate costs provided by the manufacturer, we estimated the <br />cost per square yard for applying each dust suppressant. Table iv presents <br />a summary of the estimated costs for comparison. <br />OTHER POTENTIAL SOLUTIONS <br />Wind erosion is primarily related to the moisture content of soils. Wet <br />soils do not blow. If the soils can be kept moist, then little wind erosion <br />generally occurs. The moisture content is generally lowered by hot, dry <br />winds before wind erosion occurs. Wind velocity and turbulence, soil sur- <br />face condition and soil characteristics also influence wind erosion. Tests <br />have shown that thant~it}rted by wind increases rapidly as wind <br />~J speeds' excel*fi"S ou mi es per hour Wind' eYbsiorc'is'-gene ally ess severe <br /> <br />