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WASTE DISCHARGE REQUIREMENTS -3- CALIFORNIA AMMONIA COMPANY CALAMCO - STOCKTON TERMINAL SAN JOAQUIN COUNTY On rare occasions, the supply water from the river has an elevated pH of 8.5 or above. The high pH in the river water is possibly attributable to diurnal algal respiration. Provision D.1 requires a study be conducted to verify that the high pH is not due to Calamco's discharge. If Calamco is not the cause of the elevated pH, this permit allows the pH alarm trip to temporarily be set 0.2 pH units higher than influent pH in order to allow for fluctuations in river pH and calibration drifts in facility equipment. When river pH is again below 8.5, automated shut-off at a pH of 8.5 will be reactivated. The Discharger has estimated a worst case scenario for an ammonia leak and corresponding maximum ammonia concentrations and ammonia mass loadings to the Deep Water ChanneL The Discharger estimated ammonia concentrations in the event that a relatively low concentration of ammonia was released that would not result in an increase in water pH to 8.5 and therefore would not activate the alarm system. The estimated maximum daily ammonia release that would occur is based on a relatively low influent pH and an effluent pH of 8.45. Mass loadings of ammonia to the Wine Slip would be approximately 730 kilograms over a 24-hour period and ammonia concentrations in the water following complete mixing in the Wine Slip would increase by approximately 0.37 mg/1 over ambient levels. Monitoring of influent and effluent pH at two hour intervals will minimi7e the duration of a low-concentration ammonia leak. The Discharger has also estimated a one-time leak of a large quantity of ammonia to the heat exchanger that will activate the pH alarm system immediately, triggering the water diverter valve. The diverter valve would close prior to an ammonia release to the Wine Slip, although it is estimated that approximately 0.13 kilograms of ammonia would be trapped in the piping and could be released to the Wine Slip if the piping/valving were not air tight. The increase in the ammonia concentration in the Wine Slip water following complete mixing if this ammonia was discharged would be approximately 0.0001 mg/1 over ambient levels. The Report of Waste Discharge describes the cooled water discharge as follows: Monthly Average Flow: 5 8 million gallons per day (mgd) Maximum Daily Flow: 11.7 mgd Average Temperature: 65°F summer; 50°F winter Constituent Concentration pH 6.5 - 8.4 Ammonia (as N) 0.8 mg/1* TSS <20 mgil Oil and Grease 6 mg,/1