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• <br />Roads used for coal haulage and refuse haulage commonly have graveled <br />surfaces which require dust control. Watering these roadways is the most <br />common dust control measure, but chemical dust control measures have and <br />will continue to be used on these roads. Magnesium Chloride and Calcium <br />Chloride have been the most effective means of reducing the watering <br />requirements. MSDS sheets for both chemicals are given in Appendix 17-1. <br />These chemicals are received in a liquid form with a solid content of 30-38% by <br />weight. The liquid is sprayed on roads at a rate of 0.25-0.5 gallons per square <br />yard. The suggested application frequency is twice a year. The estimated <br />annual usage for surface roadways is up to 18,000 gaVyear or approximately 34 <br />tons of solids. As these solids build up in the roadway, application rates will <br />diminish. <br />U <br />(iii) .Collection, recording, and reporting of water quality and quantity data will be <br />carried out under the requirements of the NPDES permit <br />(iv) See Tab Section 18 for the hydrologic monitoring plan and Tab Section 19 for <br />the probable hydrologic consequences of mining. <br />(v) The location of each water diversion, collection, conveyance, treatment, <br />storage, and discharge facility within the permit area is shown in Exhibit 17, Tab <br />Section 7. <br />(vi) Groundwater from the permit area and adjacent area originates in the Colorado <br />River. Water removed from underground mine workings will be treated and <br />returned to the river. Therefore, the approximate recharge capacity of the <br />project area is balanced. <br />• 17-5 (Retype 12!16!96) <br />