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WASTE DISCHARGE REQUIREMENTS ORDER NO. -2- TEICHERT AGGREGATES AND CALAVERAS MATERIALS, INC. TRACY ROCK PLANT AND FLINTKOTE SETTLING PONDS SAN JOAQUIN COUNTY 10. Wastewater originates from an earth materials aggregate plant. Water is recycled as much as possible, however, due to infiltration and evaporation, approximately 1,800 gallons per minute (2.6 mgd) of makeup water is added when the facility is processing material. All industrial wastewater generated on site is discharged to a series of settling ponds. No flocculants are added to the wastewater. 11. The settling ponds are located within a former gravel aggregate excavation. Visual observation reveals excess storage capacity. The wastewater ponds that are in use are located in a much larger excavation that is a former quarry pit. Provision E.Lc requires that the Discharger complete a water balance to demonstrate that there is adequate wastewater storage capacity. 12. Domestic wastewater is discharged to a septic system permitted by the San Joaquin County Department of Environmental Health. Approximately three to four employees are located on site. Chemical toilets are provided for site visitors. 13. The property is zoned for an aggregate plant, asphalt plant, and a concrete batch plant. In the past, concrete batch plants have been located at the site. Similarly, an asphalt batch plant was located at the site but has recently been moved to the Teichert Vernalis processing facility. The Discharger states that based on demand, a portable asphalt plant could be moved to the Tracy site. In the past, portions of the site have been leased to a ready mix concrete producer. The Discharger has never operated a ready mix plant at the site. Presently, the Discharger has no plans for a concrete batch plant at the site but wants to keep the option open. 14. Water is supplied by an onsite groundwater supply well equipped with a 4,000 gpm pump. A second well is located near the scale house which supplies nonpotable water to the scalehouse. Drinking water for the site is supplied by bottled water. No treatment of groundwater prior to use is provided. 15. A neighboring business, Amiron Pipe, discharged excess stormwater to the Flintkote property until recently. As of 13 February 2001, Amiron has ceased the stormwater discharge. 16. Groundwater exists approximately 90 feet below ground surface. Based on interpretation of the surface topography, groundwater likely flows to the northeast. 17. The Discharger is not in compliance 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 activities). This WDR requires the Discharger to comply with the NPDES permitting requirements. 18. Surrounding land uses are primarily industrial and agricultural. Tracy Municipal Airport is located west of the site.