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WASTE DISCHARGE REQUIREMENTS ORDER NO. 99-103 -2- SEBASTIANI VINEYARDS, INC. SAN JOAQUIN COUNTY 7. Water for processing is derived from supply wells. There are two supply wells at each of the facilities (four total). These wells range in depth from approximately 135 to 170 feet below ground surface (bgs). Depth to groundwater is between 13 and 20 feet bgs, based on completion logs. Water from the supply wells is used for processing and domestic purposes. 8. Winery waste solids products, consisting of grape skins, stems, leaves and seeds, are disposed of as agricultural wastes and are hauled off-site. 9. Prior to disposal, winery wastewaters are screened and adjusted for pH. Screening to remove solids down to a particle size of 0.5 milllimeters is conducted using wedgewire type screens. The acidic pH of the wastewater, resulting from the fermentation process, is adjusted to a neutral pH using ammonia. 10. Wastewater disposal from both wineries is conducted at the TRV West facility. Production wastewater from the TRV East facility is collected in a sump at the northwestern corner of the site and is pumped to TRV West through a pipeline along the southern edge of Turner Road. 11. Since expansion, discharges from the two facilities have increased to approximately 160,000 to 170,000 gallons per day (gpd), corresponding to an annual crush rate of approximately 30,000 tons. Flows are anticipated to increase to a maximum of 650,000 gpd (annual crush rate of approximately 100,000 tons). Maximum flows generally occur from August to October during the grape crushing season. 12. Compound concentrations in the winery wastewater are the highest during the crush season, typically in the following ranges: Compound Units Concentration Range Biochemical Oxygen Demand(BODS') mg/1 750-5,000 - Supsended Solids mg/1 200-800 pH pH units 3.0-5.0 Dissolved Oxygen mg/1 0-9.0 Nitrate mg/1 5.0-50 Sulfate mg/1 0-75 1 Five-day,20• Celsius Biochemical Oxygen Demand. Upon treatment, BODS concentrations will be reduced to approximately 10 milligrams per liter (mg/1) during average flows and to 15 mg/1 during peak flows. The Total Suspended Solids is estimated to be 12 mg/1 during average and peak flows. Compound concentrations should be reduced by an average annual rate of about 97 percent. 13. Wastewater treatment is conducted using an Advanced Integrated Pond System (AIDS) and constructed wetlands, which cover 42 acres at the TRV West facility. The AIPS consists of