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WASTE DISCHARGE REQUIREMENTS ORDER NO. • _ MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY 16 WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY support the requested discharge. Therefore, this Order limits the Discharger to that which will not degrade the underlying groundwater. GROUNDWATER DISCHARGE ANALYSIS—LAWS, RULES,AND REGULATIONS 79. For the waste constituents present in the discharge in significant concentrations, the water quality objectives determined by the translator process from narrative objectives are all less than observed background water quality, except for nitrate. Because all forms of nitrogen can convert to nitrate in groundwater, and the most sensitive use for the constituent is domestic drinking water, the nitrate standard of 10 mg/L as nitrogen is the governing water quality objective. Further, to satisfy the taste and odor narrative objective, the ammonia form of nitrogen can be no greater than 0.5 mg/L as nitrogen based on consideration of a published European Union drinking water standard. Where background water quality is unaffected by other discharges and greater than water quality objectives, the background water quality governs. 80. The general concentrations of key waste constituents in the settling pond, storage pond, and in wastewater applied to land compare with groundwater and water quality objectives as follows: 1-Meal Settline On-Site Background Pond Supply Well Groundwater= Objectives DIS 2,638 NM' NM NA Chloride. 433 334 99 106 Sodium 826 372 260 103 TDS 4,675 1,513 995 450 Nitrogen 50.63 4.4 9.4" 10 BOD 1,928 NM 3.3 0 EC 4,256 2,168 1,700 NA NM denotes Not Measured NA denotes Not Applicable ' All nitrogen was present as TKN,nitrate no detected in the samples. " Reported as the average sum of N0,as N and total Kjeldahl nitrogen. s Background quality defined by the average concentrations of samples from Wells MW-1 and MW-8. 81. The discharge is nonhazardous, but exhibits characteristics of"designated waste," as the concentrations of some waste constituents when treated, stored, and applied to land have potential for causing exceedances of water quality objectives or adversely affecting beneficial uses. The discharge contains decomposable waste constituents (e.g., organic carbon and nutrient compounds) and inorganic dissolved solids in concentrations that are greater than water quality objectives when released from any of these structures or from what is applied to land. 82. The discharge must be categorized as designated waste because of these constituents and subjected to the full containment provisions of Title 27 unless it can be demonstrated that constituents of