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CENTRAL VALLEY REGIONAL WATER QUALITYJONTROL BOARD • INSPECTION REPORT DISCHARGER: City of Lodi 10 June 1993 White Slough Water Pollution Control Facility LOCATION & COUNTY: Lodi , San Joaquin County CONTACT(S): Del Kerlin, Wastewater Treatment Supervisor .&IV iCTION DATE: 8 June 1993 INSPECTED BY: Patricia Leary ACCOMPANIED BY: Jack Del Conte, RWQCB Del Kerlin Fran Forkas, Water/Wastewater Superintendent, Lodi INTRODUCTION: The City of Lodi , White Slough Water Pollution Control Facility, is regulated by Waste Discharge Requirements, Order No. 93-030, NPDES No. CA0079243 (WDRs) , adopted 26 February 1993. The City operates an activated sludge plant for domestic wastewater, with a design capacity of 8.5 MGD. Actual flows are approximately 6 MGD, and the WDRs prohibit flows in excess of 7 MGD pending completion of some water quality studies on the expanded flows. The majority of industrial wastewater is discharged to a pond system, and is used to irrigate 650 acres of agricultural land. Unchlorinated domestic effluent is mixed with the industrial wastewater and used for reclamation whenever irrigation needs are sufficient to accomodate the flows, or when the wastewater does not meet effluent 1 imi ts, or dissolved oxygen concentration in the receiving water drop below 5 mg/l and surface water discharges are prohibited. OBSERVATIONS AND COMMENTS: The treatment plant was inspected to determine compliance with the WDRs. We toured the mechanical plant, the ponds, and drove to inspect the fields being used for reclamation. At the time of the inspection, all effluent from the activated sludge plant was being discharged to the pond system with the industrial wastewater, and was being used for reclamation. There was no discharge to Dredger Cut. I noted that many of the fields are now planted in corn instead of alfalfa. The City explained that the new sludge regulations (40 CFR Part 503) require at least 30 days time between sludge application and harvest of the crop. Therefore, as part of new lease agreements with farmers, a certain percentage of the fields are now required to be planted in corn. The City indicated that the farmers supplement the nutrients in the wastewater and sludge with liquid nitrogen applications. Also, there were cattle, estimated at 80 head, grazing