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California Regional Water Quality Control Board Central Valley Region Winston H.Hickox Robert Schneider,Chair r - Gray Davis Secretaryfor ) ^'• Governor Environmental Sacramento Main Office ! 53 Protection Internet Address: http://www.swrcb.ca.gov/rwgcb5 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 Mr. Morris Allen, Director 14 February 2001 Department of Municipal Utilities 2500 Navy Drive. Stockton, CA 95206-1191 TRANSMITTAL OF INSPECTION REPOR I, CITY OF STOCKTON REGIONAL WASTEWATER CONTROL FACILITY,NPDES NO. CA0079138, ORDER NO. 94-324,SAN JOA QVIN CO UNTY Enclosed is a copy of the inspection report of the City of Stockton Regional Wastewater Control Facility (RWCF), conducted on 8 December 2000. The inspection was conducted to follow up the 7 December 2000 reported release of non-disinfected secondary effluent to the San Joaquin River through a faulty gate valve. The inspection included a site visit of the Tertiary Treatment Facility, meeting with your staff, review of the December 2000 self-monitoring report, and review of the 15 December 2000 incident report. The inspection of the Tertiary Treatment Facility did not reveal any obvious violations of the NPDES permit at the time of the site visit. The leaking recirculation gate valve has been repaired and a procedure is in place to prevent the possibility of leakage in the event of another broken valve nut. The release was an operational upset caused by mechanical failure and resulted in an unintentional bypass non-disinfected secondary effluent. The leak resulted in an estimated release of between 4,920 gallons to 14,400 gallons of non-disinfected secondary effluent, which was significantly diluted by the disinfected effluent. I believe that RWCF staff needs to be more proactive in their response and monitoring of non permitted discharges. RWCF staff should and be familiar with standard operating procedures dealing with incident response. Standard Provisions and Reporting Requirements A.17. states in part, "Reasonable steps shall include such accelerated or additional monitoring as necessary to determine the nature of the impact of the non-complying discharger or sludge use or disposal." If you have any questions regarding this letter or the enclosed Inspection Report,please call me at (916) 255-3022.22555-3002-2. ROBERT S. FAGERNESS, P.E. Associate Engineer Enclosure: Inspection Report California Environmental Protection Agency 0 Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swreb.ca.gov/mgcb5