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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -5- WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -6- 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 9. Clean Water Act Section 303(a-c),required states to adopt water quality standards,including 10. The State Water Resources Control Board(State Board or SWRCB)on 16 May 1974,adopted criteria where they are necessary to protect beneficial uses. The Regional Board adopted water Resolution No.74-43 titled"Water Quality Control Policy for the Enclosed Bays and Estuaries quality criteria as water quality objectives in the Basin Plan. The Basin Plan states that"[t]he of California". The requirements within this Order are consistent with the Policy. numerical and narrative water quality objectives define the least stringent standards that the Regional Board will apply to regional waters in order to protect the beneficial uses." The Basin 11. The State Board adopted the Water Quality Control Plan for the San Francisco Bay/Sacramento- Plan includes numeric and narrative water quality objectives for various beneficial uses and San Joaquin Delta Estuary on 22 May 1995(Bay/Delta Plan). The Plan includes water quality water bodies. This Order contains Receiving Water Limitations based on the Basin Plan objectives,which are implemented as part of this Order. numerical and narrative water quality objectives for biostimulatory substances,chemical constituents,color,dissolved oxygen,floating material,oil and grease,pH,pesticides, 12. The Basin Plan contains the"Policy for Application of Water Quality Objectives" radioactivity,salinity,sediment,settleable material,suspended material,tastes and odors, (Implementation Policy)that,among other policies,establishes policies for implementation of temperature,toxicity,turbidity,and electrical conductivity. Numeric Basin Plan objectives that narrative water quality objectives. This Implementation Policy states,in part, are applicable to this discharge and which have been incorporated as Receiving Water Limitations include: "Where compliance with these narrative objectives is required(i.e.,where the objectives are applicable to protect specified beneficial uses),the Regional Board will,on a case-by- a. Dissolved Oxygen—The Basin Plan includes a water quality objective that within the legal case basis,adopt numerical limitations in orders which will implement the narrative boundaries of the Delta,the dissolved oxygen concentration shall not be reduced below 5.0 objectives. To evaluate compliance with the narrative water quality objectives,the mg/1 in all Delta waters except in those waters designated otherwise. Numeric Receiving Regional Board considers,on a case-by-case basis,direct evidence of beneficial use Water Limitations for dissolved oxygen are included in this Order and are based on the impacts,all material and relevant information submitted by the discharger and other Basin Plan objectives. interested parties,and relevant numerical criteria and guidelines developed and/or published by other agencies and organizations..." b. pH—The Basin Plan includes numeric water quality objectives that the pH"...not be depressed below 6.5 nor raised above 8.5. Changes in normal ambient pH levels shall not Narrative water quality objectives applied in this Order include(1)the"Chemical Constituents" exceed 0.5 in fresh waters with designated COLD or WARM beneficial uses." Numeric objective,which states that"waters shall not contain chemical constituents that adversely affect Receiving Water Limitations for pH are included in this Order and are based on the Basin beneficial uses. The Chemical Constituent objective also lists specific numeric objectives for Plan objectives for pH. certain constituents and incorporates state Maximum Contaminant Levels(MCLS)promulgated in Title 22 California Code of Regulations(CCR)Division 4,Chapter 15,and(2)the"Narrative C. Turbidity—The Basin Plan includes a water quality objective that"[i]ncreases in turbidity Toxicity Objective",which states,in part,"All waters shall be maintained free of toxic attributable to controllable water qualityfactors shall not exceed the following limits: substances in concentrations that produce detrimental physiological responses in human,plant, animal,or aquatic life." • Where natural turbidity is between 0 and 5 Nephelometric Turbidity Units(NTUs), increases shall not exceed 1 NTU. 13. The SWRCB Water Quality Control Plan for Control of Temperatures in Coastal and Interstate Waters and Enclosed Bays and Estuaries of California(Thermal Plan)is applicable to this • Where natural turbidity is between 5 and 50 NTUs,increases shall not exceed 20 discharge. For purposes of the Thermal Plan,the Discharger is considered to be an Existing percent. Discharger of Elevated Temperature Waste. • Where natural turbidity is between 50 and 100 NTUs,increases shall not exceed 10 ANTIDEGRADATION NTUs. 14. State Board Resolution No.68-16(hereafter Resolution 68-16)and 40 Code of Federal • Where natural turbidity is greater than 100 NTUs,increases shall not exceed 10 Regulations(CFR)section 131.12 require the Regional Board,in regulating discharge of waste, percent." to maintain high quality waters of the State until it is demonstrated that any change in quality will be consistent with maximum benefit to the people of the State,will not unreasonably affect A numeric Receiving Water Limitation for turbidity is included in this Order and is based on beneficial uses,and will not result in water quality less than that described in the Regional the Basin Plan objective for turbidity. Board's policies. Resolution 68-16 requires the discharge be regulated to meet best practicable treatment or control to assure that pollution or nuisance will not occur and the highest water quality consistent with the maximum benefit to the people of the State be maintained.