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• CENTRAL VALLEOEGIONAL WATER QUAaLITY ANTROL BOARD INSPECTION REPORT 21 March 2000 DISCHARGER: White Slough Water Pollution Control Plant LOCATION & COUNTY: 12751 N. Thornton Road, San Joaquin Count, CONTACT(S): Mr. Del Kerlin, Assistant Wastewater Treatment Supervisor INSPECTION DATE: 9 February 2000 1000 — 1200 hrs INVESTIGATED BY: Robert Fagerness and Mark Bradley (Regional Board) ACCOMPANIED BY: Del Kerlin and Brett Moroz (City of Lodi) OBSERVATIONS AND COMMENTS: On 9 February 2000 Mark Bradley and I met with Mr. Del Kerlin, Assistant Wastewater Treatment Supervisor and Mr. Brett Moroz Chief Wastewater Plant Operator of the White Slough Water Pollution Control Plant. The inspection was specific to the chlorination and dechlorination processes of the plant, due to their failure from 3-4 January 2000, resulting in the release of an approximately 600,000 gallons of treated effluent at concentrations up to 8.2 mg/1 residual chlorine, equivalent to 26 pounds of chlorine discharged to Dredger Cut. The inspection involved an initial meeting to discuss the chlorination process and the reason why the chlorine release occurred as well as a physical inspection of the chlorine mixing, analysis, and dechlorination processes. The inspection also included observations of the receiving water at the effluent outfall and receiving water sampling stations. Chlorination Dechlorination Process The chlorine flash mixer, chlorine contact chamber and chlorine analyzers were inspected. There are three sampling locations (one after the flash mixer, one after the chlorine contact chamber, and one after the sulfonator). The samples are automatically drawn from these locations and piped to the two chlorine analyzers. There are no known problems associated with the auto samplers or tubing used to collect and deliver the samples to the chlorine analyzers. The first chlorine analyzer measures the sample collected after the flash mixer and is referred to as the dose analyzer. The second chlorine analyzer, is referred to as the residual analyzer, and measures residual chlorine after the contact chamber and also measures the chlorine residual after the sulfur dioxide injection point. The sample collected after the sulfonator is analyzed by the residual analyzer approximately once every 45 minutes over a several minute increment. There are no sulfur dioxide residual analyzers in use at this facility.