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WASTE DISCHARGE REQUIREMENTS ORDER NO. - 13- MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY WASTEWATER TREATMENT AND LAND DISPOSAL FACILITY SAN JOAQUIN COUNTY 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. 64. 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. 65. 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 assures no adverse affect on any nonagricultural beneficial use: Increasine Problem and Related Constituent No Problem Problem Salinity of Irrigation Water(EC, µmhos/cm) <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 NH,--N(mg/L) (for sensitive crops) <5 5-30 NO3-N(mg/L) (for sensitive crops) <5 5-30 HCO3 (mg/L)(only with overhead sprinklers) <90 90- 520 pH normal range =6.5—8.4 * Assumes an EC:TDS ratio of 0.6:1 66. The Agricultural Guidelines present the maximum EC that various crops will tolerate before experiencing percent crop reductions (i.e., 0, 10, 25, and 50%). Data below summarizes irrigation water EC data (in µmhos/em) for crops cultivated in the vicinity of the facility at various EC: