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WASTE DISCHARGE REQU&MENTS ORDER NO. R5-2004-0020 -35- CITY OF MANTECA, CITYATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY values for influent samples collected at approximately the same times during the same period(85 percent removal). 5. The discharge shall not have a pH less than 6.5 nor greater than 8.0. 6. Effective immediately, the 30-day average dry weather discharge flow shall not exceed 6.95 million gallons per day, less the amount disposed on land at agronomic rates. 7. Effective 31 March 2004, and pursuant to compliance with effluent ammonia limitations, the 30-day average dry weather discharge flow shall not exceed 8.11 million gallons per day, less the amount disposed on land at agronomic rates. 8. Effective 1 February 2009, and in compliance with Provisions 1 and 4,the 30-day average dry weather discharge flow shall not exceed 9.87 million gallons per day, less the amount disposed on land at agronomic rates, and all discharges shall be on out-going tides only. 9. The peak wet weather discharge flow shall not exceed 13 mgd. 10. Survival of aquatic organisms in 96-hour bioassays of undiluted waste shall be no less than: Minimum for any one bioassay- - - - - - - - - 70% Median for any three or more consecutive bioassays - - - - 90% 11. The maximum temperature of the discharge shall not exceed the natural receiving water temperature by more than 20°F. 12. The total annual mass discharge of mercury shall not exceed 0.69 lbs per year. This interim performance-based limitation shall be in effect until final TMDL is established for mercury. The procedures for calculating mass loadings are as follows: a. The total pollutant mass load for each individual month shall be determined using an average of all concentration data collected that month and the corresponding average monthly flow. All monitoring data collected under the monitoring and reporting program,pretreatment program and any special studies shall be used for these calculations. b. In calculating compliance, the Discharger shall count all non-detect measures at one- half of the detection level. If compliance with the effluent limitation is not attained due to the non-detect contribution, the Discharger shall improve and implement available analytical capabilities and compliance shall be evaluated with consideration of the detection limits. c. The Discharger shall submit a cumulative total of mass loadings for the most recent twelve months in accordance with the MRP No. R5-2004-0028. If mercury is found to be causing toxicity based on acute or chronic toxicity test results, or if a TMDL program is adopted,this Order shall be reopened and the mass effluent