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II WASTE DISCHARGE Rb.1UIREMENTS ORDER NO. -3- GEORGE REED, INC. AND 711 MATERIALS, INC. AGGREGATE MINE AND WASTEWATER SYSTEM SAN JOAQUIN COUNTY WASTEWATER'SYSTEM 16. All wash water and most stormwater generated on site are discharged to a series of settling ponds. No flocculants are added to the wastewater. Wastewater is generated at the r aggregate washing plant,.the.asphaltic concrete baghouse, and the concrete batch plant. Wastewater generated at the concrete batch plant is discharged to a separate system, the concrete washout facility. 17. . Wastewater is discharged to a series of settling ponds that presently total approximately 12 acres surface area. The wastewater drains by gravity to the recycle pond from which water is pumped for reuse. 18. The settling ponds are located within former excavations. Wastewater pond locations have changed over the years of operation because the ponds fill with sand, silt, and clay particles. Ponds may be located anywhere 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. 19. The Discharger submitted a water balance that showed adequate containment for wastewater and stormwater at a flow rate of approximately 500,000 gpd. The water balance included consideration of stormwater runoff generated off site. 20. The facility is located within the 100-year flood plain of the Mokel mine River. In order to prevent the discharge of waste during flood events, the Discharger has presented a plan to install a mechanical treatment system and to physically protect the primary settling ponds from a 100-year flood. 21. This Order requires construction of primary settling ponds that are protected from inundation from a 100-year flood. The combination of the proposed mechanical settling equipment and the primary settling ponds must provide an effluent that carries less suspended sediment than the suspended sediment load of the Mokelumne River at flood stage. The remaining recycle ponds can be located in the floodplain. 22. While the mechanical separation equipment is installed, wastewater would be discharged into Pond A. After the mechanical equipment has been installed, wastewater from the mechanical separator equipment would be discharged to the primary settling ponds, and then into Pond A. Because Pond A might be legally classified as wetlands, the Discharger is required to submit an evaluation report determining the status of the pond prior to commencing discharge into it. 23. George Reed Inc. also operates an asphaltic concrete batch mixing plant (hot plant). The hot plant wastewater is generated in the bag house where collected dust and carrier water is piped to a 0.2 acre settling pond, then discharged to the main wastewater system. Petroleum hydrocarbons may be present in the bag house wastewater. Approximately 250 gallons per hour of wastewater will be generated during operation of the plant.