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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2002-0220 -2- TEICHERT AGGREGATES TRACY ROCK PLANT SAN JOAQUINCOUNTY 8. The Discharger estimates that approximately 12.1 millions tons of usable aggregate remain on the Pereira Property, and that excavation and processing of the remaining aggregate will take place over 7 to 10 years. 9. The Discharger also accepts cured waste concrete and asphaltic concrete for crushing and recycling as road base. No wastewater is generated as a result of this activity. 10. Overburden removed from mining areas is placed as fill to facilitate reclamation, usually in former excavation areas. No waste piles are maintained at the facility. 11. Wastewater originates from washing aggregate materials and processing equipment. The wash water is recycled as much as possible, however, due to infiltration and evaporation, up to 1,800 gallons per minute (2.6 mgd) of makeup water is added during processing. All industrial wastewater generated on-site is discharged to a series of settling ponds. No flocculants or other chemicals are added to the wastewater. 12. Based on analytical data provided in the RWD, the chemical character of the wastewater is summarized below. Analytical Result Settling Pond Constituent/Parameter Units Plant Effluent Supernatant Total Dissolved Solids mg/L 581 595 pH 7.5 7.5 Total Alkalinity mg/L 123.9 136.5 Total Hardness mg/L 259.1 261.1 Sodium mg/L 103 106 Potassium mg/L 3.1 5.1 Chloride mg/L 28 28 Sulfate mg/L 27 26 13. Currently, wastewater is discharged to one of several settling ponds owned by Calaveras Materials, Inc. (the Flintkote settling ponds) or on-site settling ponds east of the current excavation area, as shown on Attachment A. The Flintkote settling ponds are on Assessor's Parcel Number 253-12-17 in Section 9, T3S, R5E,MDB&M. 14. All existing settling ponds are within former aggregate excavation areas and are typically used until they fill up with fines. Filled ponds are reclaimed in accordance with the Discharger's Surface Mining and Reclamation Act (SMARA) Reclamation Plan.