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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -24- <br /> DELICATO VINEYARDS, INC. <br /> DELICATO FAMILY VINEYARDS <br /> SAN JOAQUIN COUNTY <br /> g. Arsenic. The current monitoring program does not require analysis of arsenic <br /> wastewater or groundwater. However as noted in Finding 76, excessive BOD <br /> loading rates can deplete oxygen, resulting in anoxic conditions that can <br /> solubilize naturally occurring metals in soil. Based on one sampling event, it <br /> appears that arsenic exceeds the primary MCL of 10 pg/L in upgradient <br /> monitoring well MW-6. Groundwater samples from monitoring wells MW-1 <br /> through MW-6 in August 2012 indicate that the discharge has not caused <br /> degradation for arsenic; however, additional groundwater monitoring data are <br /> needed to verify that unreasonable groundwater degradation is not occurring. <br /> h. Iron. The current monitoring program does not require analysis of iron in <br /> wastewater or groundwater. However as noted in Finding 76, excessive BOD <br /> loading rates can deplete oxygen, resulting in anoxic conditions that can <br /> solubilize naturally occurring metals in soil. Based on one sampling event in <br /> August 2012, iron was not detected in any monitoring well. The limited data <br /> indicate that the discharge has not caused degradation for iron; however, <br /> additional groundwater monitoring data are needed to periodically verify that <br /> groundwater unreasonable degradation is not occurring. <br /> 82. Degradation of groundwater by waste constituents associated with the discharge <br /> of winery wastewater after effective source control measures and treatment are <br /> implemented is consistent with the maximum benefit to the people of the state. <br /> The winery currently provides approximately 300 full-time equivalent jobs and <br /> supports continued employment of approximately 240 additional people that work <br /> at the vineyards that produce the grapes used to make the wine, as well as those <br /> that produce materials and equipment used for winemaking. The Discharger <br /> anticipates providing an additional 60 full-time equivalent jobs and support for <br /> additional ancillary services as part of the facility expansion. The economic <br /> prosperity of valley communities and associated industry is of maximum benefit to <br /> the people of the State, and provides sufficient justification for allowing the limited <br /> groundwater degradation that may continue to occur pursuant to this Order. <br /> 83. The Discharger has implemented the following salinity source control, water <br /> conservation, reuse and land application management practices: <br /> a. Conversion of sodium-to potassium-based cleaning products; <br /> b. Use of timers and nozzles for increased water efficiency; <br /> c. Elimination of wine ion exchange; <br /> d. Rotovac water-cooled pump recirculation servicing; and <br /> e. Certification under California Sustainable Winegrowing guidelines <br /> The RWD states that the Discharger has implemented some salinity source <br /> reduction, but did not specify the level of salinity reduction that was achieved. <br /> Effluent monitoring data since 2002 do not indicate that salinity reduction has been <br />