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• <br />• <br /> <br />delivered to the site is 100 gallons per month. The potable water will be stored and dispensed in <br />the office trailer which will be located in the facilities area. <br />16. Water Ouality Concerns <br />Since the gravel to be mined is below the water table, a pit pump must be used to dewater the pit <br />prior to mining. As shown in Exhibit G - Water Information, the pump will only pump clean <br />groundwater to discharge into the River. The approved NPDES permit :for the site allows for <br />sediment levels between 35 and 70 milligrams per liter total suspended solids. This level is far <br />lower than the average sediment load of the River itself. USGS gage water quality data show that <br />the River runs an average flow that is much higher, with flows during nmoff events and spring <br />thaw reaching 1500 to 2000 milligrams per liter or more. The discharge from this operation will be <br />better in quality than the River itself. <br />The portable plants and associated fuel tanks may be located in the pit bottom as shown on Map C- <br />2, but will be removed if there is any chance of flooding the pit from the river. The staff gauge <br />plan discussed in subsection 7.0 of Exhibit D. <br />17. Dust and Smoke Control <br />Dust and smoke is regulated through the State Air Permit. This pit will produce minimal fugitive <br />dust due to the fact that is a wet pit. The material that is mined will have high moisture content and <br />will naturally suppress dust. Also, this gravel has a low fines content; for this reason, it's <br />processing results in very little fine waste. The portable crushing and screen plant will move with <br />the mining operation. It will have its own air emissions permit. Controls for this equipment include <br />water sprays and enclosed crushing. The asphalt and concrete plants located on site will have <br />individual portable air permits and will be operated within the specifications required by the State. <br />All of these permits require opacity testing for dust and smoke. A revised Air Pollution Emission <br />Notice (APEN) and the approved Operation and Maintenance Plan are included in Appendix E. <br />The operating and maintenance plan shows the level of detail that will take place for monitoring <br />dust and maintenance of mitigation controls on site. <br />Scott Pit March 10 <br />D-14