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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2002-0072 -3- GEORGE REED, INC. AND 711 MATERIALS,INC. AGGREGATE MINE AND WASTEWATER SYSTEM SAN JOAQUIN COUNTY Sample Name Date Result Sample Location M309536 9/27/01 1.2 ng/1 Mokelumne River Downstream 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 at this time; however, flocculants might be added to the wastewater at a later date. Wastewater is generated at the 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 (which is attached hereto and made part of this Order by reference), 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 Mokelumne 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 or to add sufficient mechanical treatment equipment to eliminate the need for the primary settling ponds. 21. If the Discharger continues to use primary settling ponds,then they must be 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 will 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 at 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