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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0103 - 13 - CONSTELLATION BRANDS U.S. OPERATIONS, INC. dba WOODBRIDGE WINERY WOODBRIDGE WINERY SAN JOAQUIN COUNTY monitored during the study period. Key conclusions of the study were: a. The soils at the facility were determined to be in excellent condition for agricultural use. Soils possess low salinity, slightly lower than optimum pH, and nitrogen supplies that were slightly higher than expected for cropped fields. At the end of the study, nitrogen levels had been reduced and soil pH was increasing. b. Crop uptake of salt ions is less than the amount of FDS applied. c. Percolation control was determined to be an effective mechanism for groundwater quality protection. d. Careful monitoring of soil moisture content was recommended to schedule irrigation to minimize groundwater quality degradation. RESIDUAL SOLIDS 35. Pomace and spent Diatomaceous Earth (DE) are generated in wine making processes and will be placed on storage areas constructed of concrete or asphaltic concrete and equipped with drains to collect residual liquid that leaches from the material and any storm water that falls on the pads. Liquid from the pads is discharged to the wastewater system. a. Approximately 17,000 to 28,000 tons of pomace will be generated annually. It is stored on the Pomace/Stem Pad before disposal at an off-site facility. b. Approximately 186 tons of spent DE was generated in 2009. DE is stored on the Filter Solids Pad before disposal at an off-site facility. c. Approximately 54.7 tons of screenings (solids in the waste streams caught by the screens) were generated in 2009 at the flex rake screen. Screened material is stored in debris bins for disposal at an off-site facility. 36. Storage of pomace and DE on bare ground after the initial drying on the Pomace/DE pad may allow storm water to mobilize residual waste constituents. Such storage is not protective of groundwater quality and is not allowed under this Order. SITE SPECIFIC CONDITIONS 37. Land use in the vicinity of the site consists primarily of vineyards. The topography of the surrounding area is level. 38. The tops of the berms of all of the Lower Ponds (located adjacent to the Mokelumne River) are lower than the currently-defined Federal Emergency Management Agency (FEMA) 100-year flood zone. The Lower Ponds are vulnerable to inundation by the Mokelumne River at the 100-year base flood elevation. The Discharger has obtained coverage under the NPDES Low Threat General Waste Discharge Requirements, Order R5-2008-0081 to regulate discharges of waste to surface waters associated with flood inundation of the Lower Ponds.