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WASTE DISCHARGE REQUIREMENTS -2- CITY OF STOCKTON REGIONAL WATER QUALITY CONTROL PLANT SAN JOAQUIN COUNTY Constituent me/1 BOD' 9 Total Suspended Solids 17 ' 5-Day, 20°C biochemical oxygen demand 4. Maximum waste flows occur during the summer and fall months, with the major volume contributed by the canneries connected to the city sewage system. Liquid canning wastes also provide the major organic loading to the plant during this period. 5. During the canning season, the secondary treatment units and sludge handling units are operating at their capacity. The City is upgrading the fac. ty, including expansion of the process units, as well as constructing activated sludge/nitrification units to be operated in lieu of the 630 acres of polishing ponds. 6. Although the current dry weather design flow of the secondary plant is only 38 mgd, the City optimizes the treatment costs of the tertiary plant, which includes the chlorination facilities, by intermittently operating the tertiary plant at close to its design flow. For that reason, this permit allows the discharge flow to be 55 mgd, average dry weather flow. During the term of this permit, the Discharger expects to complete plant upgrades which will increase the capacity of the secondary plant beyond 38 mgd, but it will remain less than the tertiary plant capacity of 55 mgd. 7. The Board adopted a Water Quality Control Plan, Second Edition, for the Sacramento-San Joaquin Delta Basin (hereafter Basin Plan) which contains water quality objectives for all waters of the Basin. These requirements implement the Basin Plan. 8. The beneficial uses of the San Joaquin River and Delta waters downstream of the discharge are municipal and domestic, industrial, and agricultural supply; water contact and noncontact recreation; aesthetic enjoyment; navigation; and preservation and enhancement of fish, wildlife and other aquatic resources. 9. The State Water Resources Control Board (SWRCB) adopted the Water Quality Control Plan for Salinity, San Francisco Bay/Sacramento-San Joaquin Delta Estuary on 1 May 1991 (Salinity Plan). The Plan includes water quality objectives. These requirements implement the Salinity Plan.