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WASTE DISCHARGE REQUIREMENTS ORDER NO, ALPINE PACKING COMPANY,INC. 4 WASTEWATER TREATMENT SYSTEM,SAN JOAQUIN COUNTY Average Total Pounds Analvte Concentration(mg/1) Annual Basis lbs/ac lbs/ac•dav Biochemical Oxygen Demand 108 7,046 503 1.38 22. During the winter months, wastewater is applied to the cropland above agronomic rates. This Order requires improvements to the wastewater system to lower the application to agronomic rates. During the summer months, supplemental irrigation water is required to maintain the crops. Application of wastewater to the land application area will occur year round, including the wet season. 23. According to Process Design Manual, Land Treatment of Municipal Wastewater, published by the United States Environmental Protection Agency(US EPA Publication No. 625/1-81-013), storage must be provided when climatic conditions halt operations or require reduced loading rates. Because the water balance is inadequate, the Discharger must evaluate the storage capacity of the wastewater ponds. 24. The average TDS concentration in the wastewater applied to land is 1,235 mg/l. Excessive application of TDS can result in the accumulation of salts in the soil column and subsequent migration to the underlying groundwater. The Discharger must monitor groundwater quality at the land application area and the wastewater storage ponds. If groundwater monitoring shows that this discharge results in an increased TDS level in the groundwater, then the Discharger will be required to modify the discharge such that there is no impact. GROUNDWATER CONDITIONS 25. Four groundwater monitoring wells were installed in November 2001 as part of preparation of the RWD. The wells have only been sampled once, on 29 November 2001. The well locations are shown on Attachment B. Groundwater exists approximately 44 feet below ground surface and flows to the southwest. Well MW-4 is upgradient of the Discharger's land application areas and wastewater storage ponds. Wells MW-1 and MW-2 are downgradient of land application area. Well MW-3 is located near, but cross-gradient to the wastewater storage ponds. The groundwater quality is summarized in the table below. Analyte Units MW-1 MW-2 MW-3 MW-4 Nitrate mg/l ND (0.5) ND (0.5) ND (0.5) ND (0.5) Sulfate mg/1 68 61 73 52 Total Kjeldahl Nitrogen mg/1 0.60 0.30 1.3 0.3 Total Dissolved Solids mg/l 980 880 270 290 Chloride mg/1 210 150 110 86 Total Alkalinity mg/1 640 580 410 450 Barium mg/1 ND (0.005) ND (0.005) ND (0.005) ND (0.005) Calcium mg/l 93 120 84 74 Sodium mg/1 150 72 120 86 Magnesium mg/1 39 47 35 32 Potassium mg/1 7.1 7.4 5.8 5.3 Hardness Mel 200 260 160 180 ND denotes Not Detected;detection limit shown in parentheses. CAProjcct FdeslSitmWpine Puking\WDR.doc