SITE INFORMATION AND CORRESPONDENCE_CASE 2

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INFORMATION SHEET -2- CITY OF TRACY SAN JOAQUIN COUNTY The City is proceeding with a $4.7 million project to eliminate solids handling problems which were a significant source of effluent violations when the first C&D was adopted. The City is also expanding plant capacity from 5.5 to 9.0 mgd. The solids handling and plant expansion projects are proceeding together and are scheduled for completion in 1987. Effluent limitations are established in conformance with EPA regulations, with the exception of BOD5 and suspended matter which are more stringent than EPA secon- dary drinking water standards . The effluent limit of 20 mg/l for BODS and suspended solids is required to protect beneficial uses of public health and recreation. The City discharges treated wastewater to Old River about three miles north- easterly of the City through a diffuser. Recreation in the area consists of fishing and water contact sports of water skiing and swimming, as well as boating. The point is upstream of two major water intake facilities, the Bureau of Reclama- tion Delta-Mendota Canal and Department of Water Resources Clifton Court Forebay. The major portion of Tracy's diluted discharge is diverted through the Delta- Mendota, which is a domestic water source for Tracy. Some moves to the Clifton Court intake, also a domestic water source for much of the State's population. Seasonal low river flows during July, August, and September, when accompanied by high effluent flows, could impact dissolved oxygen in Old River. The contribu- tions of the Tracy effluent to depressed oxygen has not been fixed, but it undoubtedly has some effect. River flows at Tracy are subject to tidal influence and are negative under some conditions. Determination of percent wastewater in receiving waters is difficult to calculate due to the complex nature of Delta flows. However, qualitatively, it may be quite high at times. Revised 7/17/85:SPD:car