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WASTE DISCHARGE REQUMENTS ORDER NO. -4- GEORGE REED,INC. AND 711 MATERIALS,INC. AGGREGATE MINE AND WASTEWATER SYSTEM SAN JOAQUIN COUNTY 24. A concrete batch plant is operated at the site by 711 Materials, Inc. Waste concrete is generated when concrete trucks return from their deliveries containing residual concrete. When possible, the residual concrete is used to make traffic barriers. Otherwise it is poured onto the waste concrete pile. Wastewater generated at the batch plant consists of ready m'ix truck washouts, tool wash water;and tiaffic barrier mold cleariin— D esef fuel is used as a mold release agent. 25. The concrete batch plant generates both plant wash water and vehicle wash water. The plant and vehicle wash water is discharged to the washout facility. The washout water is recycled for rinsing the mixer drums at the end of the day. The mixer drum water is discharged to the washout facility. The solid waste removed from the mixer drums is recycled for road base. 26. Water is supplied by on-site groundwater supply wells, as shown in the table below. Additional water for dust control is taken from the recycle ponds. No treatment of groundwater prior to use is provided. Well Location Discharge Rate Well No. 3 Wash Plant 475,000 gpd Well No. 7 711 Materials 5,500 gpd 27. Portable chemical toilets are provided for employees. The toilet rental company regularly services the toilets. Approximately 10 employees are located on site. SITE SPECIFIC CONDITIONS 28. Groundwater is estimated to exist approximately 15 to 20 feet below ground surface depending on elevation of the land surface. Based on interpretation of the surface topography, groundwater likely flows to the west or southwest. 29. Groundwater may be encountered in excavations, and based on economic considerations, excavation of the material may proceed below the natural water table. When excavation below the natural water table surface is performed, dewatering is required. Presently, George Reed, Inc. is not planning to dewater excavations. 30. Drinking water for the site is supplied by bottled water. 31. The surrounding land uses are primarily agricultural. 32. North of the Mokelumne River; stormwater is collected from disturbed areas on the site and discharged into the wastewater pond system. South of the river, stormwater is allowed to percolate into the soil. 33. Topsoil is removed from areas to be excavated and stockpiled; topsoil is then spread on reclaimed areas. Reclaimed areas will be used for agricultural purposes.