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WASTE DISCHARGE REQUIREMENTS ORDER NO. -3- <br /> RODNEY AND GAYLA SCHATZ <br /> MOKELUMNE RIM VINEYARDS <br /> SAN JOAQUIN COUNTY <br /> sufficient capacity to accommodate allowable wastewater flow and design seasonal precipitation <br /> for a 100-year return period. <br /> LAND APPLICATION SYSTEM <br /> 10. Historically, wastewater was applied to land either from the pond or directly from the winery after <br /> screening. That arrangement allowed poorly treated wastewater to be applied to land. This Order <br /> requires the Discharger to treat all industrial wastewater in the wastewater pond prior to land <br /> application. The land application area consists of 35 acres of vineyard. Crops will be harvested <br /> from the land application area. <br /> 11. Wastewater will be applied by flood irrigation. Because the crop irrigation needs exceed the <br /> amount of wastewater that will be applied, the land application area will also receive supplemental <br /> irrigation water. The ratio of supplemental irrigation water to process wastewater will vary <br /> through the year from approximately 7:1 to 75:1. To prevent irrigation water from entering the <br /> potable system, double check valves or similar backflow prevention devices will be installed on the <br /> irrigation system. <br /> 12. In order to prevent the potential discharge of stormwater mixed with wastewater, this Order <br /> prohibits irrigation with wastewater 24 hours before, during, or 24 hours after a rain event, or when <br /> soils are saturated. <br /> 13. Using the most restrictive infiltration value published for the soil type (2 in/hr), the land <br /> application area(35 acres), and a safety factor recommended by the U.S. Environmental Protection <br /> Agency for land treatment systems, the estimated peak flow reported in the RWD (30,000 gal/day) <br /> is less than 2 percent of the available hydraulic capacity of the land application area. <br /> 14. The RWD assumed continued discharge of untreated wastewater would be allowed. Because that <br /> process is prohibited by this Order, staff developed the following loading rates for maximum <br /> production (3,000 tons crushed per year). <br /> Com ound Concentration (mv/L)l Loading Rate (lbs/acre/year)2 <br /> BOD 0-380 45 <br /> Total Nitrogen 40 16 <br /> TDS 2,000 805 <br /> 1 BOD concentration from page 6 of 7, Section 3,February 2002 RWD, Summit Engineering. <br /> 2 Loading rate assumes 1.69 million gallons of wastewater, treated in wastewater pond with pond performance as <br /> described in reference above. <br /> 15. The RWD states wastewater nitrogen loading of the land application area will be approximately 16 <br /> lbs/ac-year. The loading rate derived from wastewater application is well below the crop uptake <br /> rate of 125 lbs/ac-year. The BOD annual loading rate is acceptable but individual applications <br /> must be managed to prevent overloading the land area that can result in nuisance odors and <br /> groundwater degradation. The total dissolved solid loading rate is a concern; this Order requires <br /> preparation of a Salinity Reduction Study to evaluate means to reduce the dissolved solids loading <br /> V:\Swi Joaquin Non 15\SuM0brimrSwj JoaquinNokc1 m cRim Vine&ds\WDRr l.doc <br />