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WASTE DISCHARGE RETIREMENTS ORDER NO. '� -2- KNIFE RIVER CORPORATION DBA KRC AGGREGATES AGGREGATE MINE AND WASTEWATER SYSTEM SAN JOAQUIN COUNTY Projected Scheduled Phase Development of Mine Phase III Sept. 2000 to 2005 Phase IV 2006 to 2011 Phase V 2012 to 2016 9. The project has been performed in phases; currently, Phase III is being mined. The facility is expected to produce approximately 0.9 million tons of aggregate per year. The facility is equipped with a scalchouse, office, equipment shop, and an equipment wash area. 10. Topsoil is removed from areas to be excavated and stockpiled. The topsoil is spread on reclaimed areas. 11. All washwater and most stormwater generated on site is discharged to a series of settling ponds. No flocculants are added to the wastewater. 12. The settling ponds are located within excavations. Wastewater pond locations have changed over the years of operation because the ponds fill with sand, silt, and clay particles. The current wastewater pond locations are presented on Attachment B, which is attached hereto and made part of the Order by reference. Ponds may be located within the indicated area shown on Attachment B as long as the Discharger is in compliance with this Order and all other requirements imposed by other agencies. 13. Domestic wastewater is discharged to a septic system permitted by the San Joaquin County Department of Environmental Health. Approximately 25 employees are located on site. Chemical toilets are provided for site visitors and employees in remote areas of the facility. 14. In the past, a concrete plant was operated at the site by the previous operator. The Discharger has never operated a concrete plant at the site. Presently, the Discharger has no plans for a concrete batch plant at the site. However, this WDR contains provisions for operation of a concrete or asphalt plant at the site if the Discharger changes its plans. 15. Water is supplied by an onsite groundwater supply well.equipped with a 1,400 gpm pump. Drinking.water for the site.is supplied by bottled water. No treatment of groundwater prior to use is provided. 16. First groundwater is reported to exist approximately 200 to 300 feet below ground surface. Based on the presence of groundwater springs shown on the United States Geological Survey's 7.5 minute topographic map titled, "Clements," groundwater likely exists in shallower zones than the estimate presented above. Groundwater is not encountered in the excavations which may extend to depths of approximately 40 feet. Based on interpretation of the surface topography, groundwater likely flows to the west. 17. The Discharger complies with the State Water Resources Control Board (SWRCB) Water Quality Order No. 97-03-DWQ National Pollutant Discharge Elimination System (NPDES), General Permit No. CAS 000001, Waste Discharge Requirements (WDRs) for Discharges to Storm Water Associated with Industrial Activities(excluding construction.