Laserfiche WebLink
WASTE DISCHARGE REQUIREMENTS ORDER NO. 12- <br /> MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY <br /> WASTEWATER TREATMENT FACILITY <br /> SAN JOAQUIN COUNTY <br /> 61. The CWC requires that waste discharge requirements implement the Basin Plan and consider the <br /> beneficial uses and water quality objectives reasonably required to protect the uses, as well as <br /> other waste discharges and conditions in the area and groundwater. The Basin Plan requires that <br /> waste discharge requirements apply the most stringent objective for each constituent to ensure that <br /> discharges do not cause groundwater to contain a chemical constituent, toxic substance, <br /> radionuclide, pesticide, or taste- or odor-producing substance in a concentration that adversely <br /> affects any beneficial use. <br /> 62. The Basin Plan procedure for applying water quality objectives as terms of discharge in waste <br /> discharge requirements requires maintenance of the existing quality of groundwater except where <br /> the Board determines an adverse change is consistent with Resolution 68-16. Resolution 68-16 <br /> requires the Board to regulate waste discharges in a manner that maintains high quality waters of <br /> the State. Any change in quality can only occur after full application of best practicable treatment <br /> and control (BPTC) of the waste and must be consistent with maximum benefit to the people of <br /> the State, not unreasonably affect a beneficial use, and not result in water that exceeds a water <br /> quality objective. <br /> 63. To protect the designated use of municipal and domestic supply, water quality objectives <br /> correspond to maximum contaminant levels (MCLs) specified in the following provisions of Title <br /> 22, California Code of Regulations. <br /> 64. Protection of agricultural supply requires consideration of narrative objectives and translators. <br /> Guidelines for identifying the quality of irrigation water necessary to sustain various crops were <br /> compiled by Ayers and Westcot in 1985 (Food and Agriculture Organization of the United <br /> Nations—Irrigation Drainage Paper No. 29). The Agricultural Guidelines estimate the potential <br /> hazards to crop production associated with long term use of the particular water being evaluated. <br /> The Agricultural Guidelines categorize ranges of concentration of each constituent as having"No <br /> Problem—Increasing Problems—Severe Problems"based on large numbers of field studies and <br /> observations, and carefully controlled greenhouse and small plot research. In general, crops <br /> sensitive to sodium or chloride are most sensitive to foliar absorption from sprinkler-applied <br /> water. Bicarbonate causes problems when fruit crops or nursery crops are sprinkler irrigated <br /> during periods of very low humidity and high evaporation. The following table contains <br /> numerical criteria from the Agricultural Guidelines identified as necessary for protection of a <br /> range of crops under various circumstances,but the most stringent is not necessarily the <br /> concentration that assures no adverse affect on any nonagricultural beneficial use: <br /> Increasing <br /> Problem and Related Constituent No Problem Problem <br /> Salinity of Irrigation Water(EC, µmhos/cm) <700 700-3,000 <br /> Salinity of Irrigation Water(TDS,mg/L)* <450 450-2,000 <br /> Specific Ion Toxicity <br /> from Root-absorption' <br /> Sodium(mg/L) <69 69-207 <br /> Chloride(mg/L) < 142 142-355 <br /> Boron (mg/L) <0.5 0.5-2.0 <br /> from Foliar Absorption <br />