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June 21,2000 Job Number. LG00-173 Page 8 Presently, 20 gallons per acre per year of CAN 17 (Calcium, Ammonium, Nitrogen 17%) is being applied to the vineyards. Our office understands from Paul Verdegaal, the San Joaquin County Farm Advisor,that this amount is roughly equivalent to 11 lbs of nitrogen per acre per year. The drip system provides enough water to sustain the vineyard's requirements and over- irrigation is probably minimized. Since vineyards are regarded as relatively low consumers of nitrogen in agriculture and the practice of regular testing(petiole, soil, and groundwater nitrate tests) is performed every two years, it is assumed that this practice probably delivers the appropriate nutrients and irrigation to the plants, potentially minimizing nitrogen leaching and over irrigation into the subsurface. For the purpose of the nitrate loading study, the irrigation, fertilization, and uptake of nitrogen and water will be considered in balance (eg: irrigation and nutrients are being consumed by the vineyards and minimal leaching of nitrogen and over watering is occurring). Nitrate from Wine Processine Waste Water The new winery is planning to eventually produce a maximum of 12,000 cases of wine per year. The waste from wine processing is the wash water needed to clean equipment and clean the inside of the stainless steel tanks. The anticipated yearly flow of winery wash water will be somewhere between 20 and 50 thousand gallons as estimated by Mr. Art Housley and Inspector Rubin Oropeza of Napa County Environmental Services. The planned use of a spraying system is estimated to reduce this amount by an additional 401/o. The majority of the wash water will be generated between September and November and is expected to be below and beyond the standards set for water quality, s therefore it is likely the wash water will be somewhere between 0 to 9.9 mg/L-N. In addition to the nitrogen, the waste water will probably be composed of clean water, sugars and organic acids that are natural to grapes. There will be small amounts of cleaning compounds used for laboratory analysis that include sodium hydroxide, iodine, sulfuric acid, sulfur dioxide, yeast, and TSP-' The waste water will be filtered then pumped into the vineyard or mixed into the drip irrigation system. For purposes of this study, a volume of 50,000 gallons of waste water, representing the a high volume at a concentration of 9.9 mg/L Nitrogen as NO, (6.1 mg/L-N) will be assumed for calculation in the nitrate loading analysis. This is a conservative estimate. Smith,M.,Letter to the Regional Water Quality Control Board dated May 26,2000 regarding anticipated waste discharge of Housley Winery. Mike Smith Engineering,Inc.,Lodi,CA pEll,Oi A ra.S�M