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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -35- WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -36- CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY SAN JOAQUIN COUNTY may be reopened and the aluminum limitation reconsidered. 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. 4. The arithmetic mean of 20°C BOD(5-day)and total suspended solids in effluent samples collected over a monthly period shall not exceed 15 percent of the arithmetic mean of the If mercury is found to be causing toxicity based on acute or chronic toxicity test results,or values for influent samples collected at approximately the same times during the same if a TMDL program is adopted,this Order shall be reopened and the mass effluent period(85 percent removal). limitation shall be modified(higher or lower)or an effluent concentration limitation 5. The discharge shall not have a pH less than 6.5 nor greater than 8.0. imposed. If the Regional Board determines that a mercury offset program is feasible for Dischargers subject to a NPDES permit,then this Order may be reopened to reevaluate the 6. Effective immediately,the 30-day average dry weather discharge flow shall not exceed interim mercury mass loading limitation(s)and the need for a mercury offset program for 6.95 million gallons per day,less the amount disposed on land at agronomic rates. the Discharger. 7. Effective 31 March 2004,and pursuant to compliance with effluent ammonia limitations, C. Discharge Specifications(Land Disposal): the 30-day average dry weather discharge flow shall not exceed 8.11 million gallons per 1. Discharge of recycled water to surface water or surface water drainage courses is day,less the amount disposed on land at agronomic rates. prohibited. 8. Effective 1 February 2009,and in compliance with Provisions 1 and 4,the 30-day average 2. The discharge shall be kept within the designated reclamation area,as shown on Figure 2, dry weather discharge flow shall not exceed 9.87 million gallons per day,less the amount at all times. 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. 3. The use of reclaimed water shall be limited to surface irrigation of fodder,fiber,or seed crops. Irrigated crops shall not be used for human consumption(either direct or indirect). 10. Survival of aquatic organisms in 96-hour bioassays of undiluted waste shall be no less Additional reclamation uses may be approved by the Executive Officer. than: 4. Reclaimed water use shall meet the criteria contained in Title 22 California Code of Minimum for any one bioassay---------70% Regulations,Division 4,Section 60301 et.seq. Median for any three or more consecutive bioassays----90% 5. Application of reclaimed water shall be at agronomic rates considering the crop,soil, 11. The maximum temperature of the discharge shall not exceed the natural receiving water climate,and irrigation management system. The nutrient loading of the disposal area, including the nutritive value of organic and chemical fertilizers,applied biosolids,and of temperature by more than 20°F. the reclaimed water,shall not exceed the crop demand. 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 6. Reclaimed water shall be managed to minimize erosion,runoff,and movement of aerosols mercury.The procedures for calculating mass loadings are as follows: from the disposal area. a. The total pollutant mass load for each individual month shall be determined using an 7. Direct or windblown spray shall be confined to the designated disposal area and prevented average of all concentration data collected that month and the corresponding average from contacting drinking water facilities. monthly flow. All monitoring data collected under the monitoring and reporting program,pretreatment program and any special studies shall be used for these 8. Objectionable odors originating at this facility shall not be perceivable beyond the limits of calculations. the wastewater treatment and disposal areas. 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 9. The discharge of domestic effluent to the reclamation area shall not exceed the following to the non-detect contribution,the Discharger shall improve and implement available limits: analytical capabilities and compliance shall be evaluated with consideration of the detection limits. Monthly Daily Constituent Units Average Maximum