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WASTE DISCHARGE REQU&MENTS ORDER NO. R5-2004-0020 -41- CITY OF MANTECA, CITYATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY b. For at least 12 months: (1) Turf is not harvested if turf is placed on land with a high degree of public exposure: and (2) If the field is used as pasture, grazing by milking animals is prevented. c. For at least 14 months: (1) Food crops with harvested parts that touch the biosolids/soil mixture and are totally above the land surface are not harvested. d. For at least 38 months: (1) Food crops with harvested parts below the land surface are not harvested; and (2) If the field is used as pasture, grazing of milking animals used for producing unpasteurized milk for human consumption is prevented. Biosolids Storage Specifications 19. Facilities for the storage of Class B biosolids shall be located,designed and maintained to restrict public access to biosolids. 20. Biosolids storage facilities shall be designed and maintained to prevent washout or inundation from a storm or flood with a return frequency of 100 years. 21. Biosolids storage facilities, which contain biosolids, shall be designed and maintained to contain all storm water falling on the biosolids storage area during a rainfall year with a return frequency of 100 years. 22. Biosolids storage facilities shall be designed,maintained and operated to minimize the generation of leachate. F. Receiving Water Limitations: Receiving Water Limitations are based upon water quality objectives contained in the Basin Plan. As such,they are a required part of this permit. The discharge shall not cause the following in the receiving water: 1. Concentrations of dissolved oxygen to fall below 5 mg/1. The monthly median of the mean daily dissolved oxygen concentration shall not fall below 85 percent of saturation in the main water mass, and the 95th percentile concentration shall not fall below 75 percent of saturation. 2. Oils, greases,waxes, or other materials to form a visible film or coating on the water surface or on the stream bottom.