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WASTE DISCHARGE REQUaL _ENTS ORDER NO. 5-01-055 -9- TRI VALLEY GROWERS PLANT NO. 4 STOCKTON, SAN JOAQUIN COUNTY C. Effluent Limitations 1. The wastewater discharged to the land application area shall not have a pH of less than 6.5 or greater than 8.5. 2. Effective 1 July 2001, the maximum total nitrogen loading to the designated disposal areas shall not exceed the agronomic rate for plant available nitrogen (PAN) for the type of crop to be grown, as specified in the most recent edition of the Western Fertilizer Handbook, PAN shall be calculated as 100% of the total nitrogen content of the waste, unless and until the Discharger demonstrates that another proportion is technically justified as described in Provision G.12. 3. Effective as of the date of this Order, the maximum BODS loading to the designated disposal fields shall not exceed: a. 3001bs/acre on any single day; b. 100 lbs/acre• day as a 7-day average; and c. The maximum loading rate that ensures that the discharge will not create a nuisance. D. Land Application Area Specifications 1. The discharge shall be distributed uniformly on adequate acreage in compliance with the Effluent Limitations. 2. Crops shall be grown on the application area. Crops shall be selected based on nutrient uptake capacity, tolerance to high soil moisture conditions, and consumptive use of water and irrigation requirements. Cropping activities shall be sufficient to take up all the nitrogen applied. Crops shall be harvested and removed from the application area. 3. The freeboard in the land disposal facility shall never be less than one foot as measured vertically from the water surface to the lowest point of overflow. 4. Wastewater application areas (e.g. furrows) shall be allowed to dry for at least 72 hours from the end of wastewater application. 5. The land application facility shall have sufficient capacity to accommodate allowable wastewater flow, design seasonal precipitation, and ancillary inflow and infiltration. Design seasonal precipitation shall be based on total annual precipitation using a return period of 100 years, distributed monthly in accordance with historical rainfall patterns. 6. Application of wastewater to the land application area shall be performed in accordance with the approved Operation and Maintenance Plan required by Provision G.Lb. 7. The soil pH within the application areas shall be not be less than 6.0. The resulting effect of the wastewater discharge on the soil pH shall not exceed the buffering capacity of the soil profile.