COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

WASTE DISCHARGE REQUIREM4TS ORDER NO.R5-2003-0179 -3- VAN RUITEN-TAYLOR RANCH LTD. VAN RUITEN-TAYLOR WINERY LLC SAN JOAQUIN COUNTY 12. The bioreactor is expected to reduce concentrations of volatile dissolved solids resulting in a lower concentration of TDS discharged to the land application area. 13. On 16 January 2003, the Discharger submitted a water balance for the wastewater treatment and disposal system. The water balance estimates the maximum daily process wastewater flow rate at 3,600 gallons per day(gpd) during the peak grape processing period, with estimated peak daily process flow rates during the off-season of approximately 1,500 gpd. The water balance utilizes 100-year annual return rainfall amounts. 14. The January 2003 water balance showed adequate land areas with capacity to accept wastewater and rainfall (using the 100-year return annual precipitation total). Staff estimates the wastewater discharge is less than one-percent of the land application area's available hydraulic capacity. Because adequate land application areas are available, a wastewater storage pond is not required. The Discharger is allowed to discharge wastewater to the land application areas during rain events provided all requirements of the WDRs are complied with. 15. The majority of the processing, including the crush area, is conducted under covered roofs to prevent commingling of stormwater runoff with process wastewater. However, some wine fermentation/storage tanks are exposed to stormwater. A manually controlled valve prevents discharge of wastewater to the stormwater pond. If wastewater and stormwater are mixed, all the water is discharged to the treatment system. When no wastewater is present in the piping, the stormwater is discharged to the stormwater pond. 16. The Discharger does not use water-softening equipment such as ion exchange water treatment. LAND APPLICATION SYSTEM 17. The Discharger proposes to dispose of treated winery effluent by irrigating 200 acres of grape vineyard using a flood irrigation system. Wastewater/supplemental irrigation water is discharged to furrows. The Discharger plans to add sand filters and an automatic mixing valve to allow wastewater application through a drip system. Because the wastewater application will not be sufficient to meet the crop irrigation needs, supplemental irrigation water will be applied. 18. The grapes from the land application area will be harvested for winemaking. In addition, viniculture practices such as annual pruning of the vines will remove nitrogen and other dissolved solids taken up by the crop. 19. The RWD, and staff's calculations, show that there is less nitrogen in the wastewater than the grapes in the vineyard will utilize. This is based on a nitrogen demand of 126 lbs/acre-year for the 200 acre vineyard, a conservative nitrogen effluent concentration (40 mg/L during crush and 5 mg/L during noncrush), and annual flows of 3,600 gpd during the crush period(approximately two months) and 1,600 gpd for the remainder of the year. The 200-acre vineyard will take up • approximately 25,200 pounds of nitrogen, and the total annual wastewater nitrogen application will contain approximately 95 lbs of nitrogen. The biological treatment process is likely to reduce the wastewater nitrogen concentration even further than assumed in the calculations.