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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0220 -3- TEICHERT AGGREGATES TRACY ROCK PLANT SAN JOAQUIN COUNTY 15. The Discharger estimates that four percent of the total volume of excavated material is discharged to the settling ponds as sediment,resulting in a sedimentation rate of approximately 40,000 cubic yards per year. 16. Domestic wastewater from the scale house restroom is discharged to a septic system permitted by the San Joaquin County Department of Environmental Health. Approximately three to four full-time employees work at the facility. Chemical toilets are provided for site visitors. Planned Changes in Discharge 17. The Discharger proposes to cease use of the Flintkote settling ponds upon adoption of this Order and will begin discharging to new settling ponds within a previous excavation area, as shown on Attachment B, which is attached hereto and made part of the Order by reference. The discharge will take place only on land owned by Teichert Aggregates. 18. The new settling pond area is approximately 22.3 acres. The Discharger will operate a primary settling pond (169,000 cubic yards or 34 million gallons), a secondary discharge pond(128,000 cubic yards or 26 million gallons), and a freshwater pond(108,000 cubic yards or 22 million gallons)within that area, as shown on Attachment C, which is attached hereto and made part of the Order by reference 19. The current on-site settling ponds and the new ponds will continue to be used until they are filled with sediment to the desired elevation for reclamation. Wash water will be recycled by drawing from the new fresh water pond as needed. All other aspects of the facility and operations will remain the same. 20. The new settling pond area is bounded on the west by the sidewall of the former excavation, which has an approximate upper elevation of 168 feet above mean sea level (MSL). The northern, eastern, and southern sides are bounded by an earthen berm with a minimum crest elevation of 155 feet MSL. 21. The new settling ponds have beginning base elevations of approximately 88, 82, and 82 feet MSL, respectively. The storage volumes cited above were determined based on the volume of sediment needed to fill the ponds to an elevation of approximately 125 feet MSL,providing for reclamation of the ponds in accordance with the Discharger's Reclamation Plan. 22. Additional liquid storage is available within the surrounding former excavation area from an elevation of 125 feet approximately 153 feet MSL. With two feet of freeboard provided by the perimeter walls of the former excavation and the earthen berm, the actual storage capacity available for sediment and water within the new 22.3-acre settling pond area is approximately 150 million gallons, and the Discharger may elect to use any portion of that area as a settling pond. 23. Storm water that falls on the site drains to low-lying portions of the site, and is collected and discharged to the settling ponds. The estimated runoff catchment area for the new