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WASTE DISCHARGE REQUIRO►tNTS ORDER NO. Nd -9- GOLDSTONE LAND COWANY,LLC AND KURT KAUTZ BEAR CREEK WINERY SAN JOAQUIN COUNTY affects any beneficial use. 49. The Basin Plan procedure for applying water quality objectives as terms of discharge in waste discharge requirements requires maintenance of the existing quality of groundwater except where the Board determines an adverse change is consistent with Resolution 68-16. Resolution 68-16 requires the Board to regulate waste discharges in a manner that maintains high quality waters of the State. Any change in quality can only occur after full application of Best Practicable Treatment and Control (BPTC) of the waste and must be consistent with maximum benefit to the people of the State, not unreasonably affect a beneficial use, and not result in water that exceeds a water quality objective. 50. To protect the designated use of municipal and domestic supply, water quality objectives correspond to maximum contaminant levels (MCLS) specified in the provisions of Title 22, California Code of Regulations. 51. Protection of agricultural supply requires consideration of narrative objectives and translators. Guidelines for identifying the quality of irrigation water necessary to sustain various crops were compiled by Ayers and Westcot in 1985 (Food and Agriculture Organization of the United Nations—Irrigation Drainage Paper No. 29). The Agricultural Guidelines estimate the potential hazards to crop production associated with long term use of the particular water being evaluated. The Agricultural Guidelines categorize ranges of concentration of each constituent as having"No Problem—Increasing Problems—Severe Problems"based on large numbers of field studies and observations, and carefully controlled greenhouse and small plot research. In general, crops sensitive to sodium or chloride are most sensitive to foliar absorption from sprinkler-applied water. Bicarbonate causes problems when fruit crops or nursery crops are sprinkler irrigated during periods of very low humidity and high evaporation. The following table contains numerical criteria from the Agricultural Guidelines identified as necessary for protection of a range of crops under various circumstances, but the most stringent is not necessarily the concentration that ensures no adverse affect on any nonagricultural beneficial use. Increasing Problem and Related Constituent No Problem Problem Salinity of Irrigation Water(EC, gmhos/em) <700 700-3,000 Salinity of Irrigation Water(TDS,mg/L)* <450 450-2,000 Specific Ion Toxicity from Root absorption Sodium(mg/L) < 69 69-207 Chloride(mg/L) < 142 142-355 Boron(mg/L) <0.5 0.5-2.0 from Foliar Absorption Sodium (mg/L) < 69 >69 Chloride(mg/L) < 106 > 106 Miscellaneous NI-14-N(mg/L) (for sensitive crops) <5 5 -30 NO3-N(mg/L) (for sensitive crops) <5 5 -30 V:San__Joaquin_NonMMMOGienll ica Filn\ Crtck\WDRdx