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Manteca Bean Facility, 229 Moffat Boulevard, Manteca, California February 9, 1993 Golden Grain Company Page 4 System operations and maintenance for the quarter is summarized below Treatment System Summary ■ 10/01/92 Vapor Extraction System (VES) operating Lo Profile Air Stripper (LO-PRO) not operating because of fouling caused by calcium build-up LO-PRO cleaned and system operational ■ 10/05/92 VES not operating because of heat damage to sensor wires in De-Leader unit Connections repaired and system operational ■ 10/08/92 System operational ■ 10/13/92 System operational ■ 10/15/92 System operational ■ 10/22/92 System operational ■ 10/29/92 System Operational Shut down system because of complaint from citizen to the fire department Installed 20 foot exhaust stack on the VES ■ 11/05/92 System not operating Automated Safety Valve Assembly (ASVA) couplers faulty ■ 11/12/92 System not operating Replacement couplers not available 0 11/19/92 System operational with fresh air influent for ASVA check ■ 11/25/92 System not operating because of blown fuse in lead scrubber ■ 12/03/92 System operational Source test and start-up procedure run through San Joaquin Valley Unified Air Pollution Control district - Plant Observation and Inspection Report-Site visit Final permit issued ■ 12/10/92 System not operating because of ASVA valves out of adjustment Correction made System operational ■ 12/17/92 System operational Manufacturer upgrade of Lo-Pro trays to increase system efficiency and minimize fouling ■ 12/29/92 System operational During this quarter of system operation, there were no releases of untreated groundwater or untreated system vapors Any system shutdowns were controlled or triggered by the system interlock which worked as designed to bring complete system shutdown for any equipment malfunction F �GROUNDWATER � 10466al cd/nk f II II TECHNOLOGY,INC