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Third Quarter 1995 Status Report 3 <br /> Golden Grain Company, Manteca Bean Facility, 229 Moffat Blvd , Manteca, CA September 25, 1995 <br /> l <br /> TREATMENT SYSTEM OPERATION AND MAINTENANCE <br /> The soil treatment system operated in continuous mode this quarter until July 20, when it was put in <br /> a pulsed mode of operation The pulsed mode of operation consists of operating the soil vapor <br /> extraction system for one week and turning it off for three weeks The operating change was made <br /> to more efficiently remove hydrocarbons from the vadose zone by allowing them to reach an <br /> equilibrium state prior to turning the system on When the system is operating, it extracts <br /> vapor-phase hydrocarbons from wells MW-1, MW-2, MW-3, and MW-4 The groundwater treatment <br /> system consisted of an air stripper until July 27, when the system was modified to use liquid-phase <br /> granular activated carbon The modification was made to lower operating costs and minimize <br /> operation and maintenance of the groundwater treatment system The groundwater treatment <br /> system extracts groundwater from well RW-1 <br /> During the quarter, 13 site visits were made to perform maintenance and routine system operation <br /> During each visit the following work was completed <br /> ■ taking flame-ionization detector (FID) measurements of catalytic oxidizer vapor influent <br /> and effluent during system operation <br /> • monitoring and recording the catalytic oxidizer operational data <br /> • monitoring and calibrating the system lower explosive limit (LEL) meters <br /> • recording operational data and maintaining vacuum extraction blowers and vapor <br /> extraction system (VES) <br /> ■ monitoring and recording operational data for the groundwater treatment system and <br /> malting adjustments as necessary <br /> ■ monitoring the condition of the catalytic water conditioner which minimizes fouling <br /> caused by the hardness of the water <br /> • performing a dally system operating parameters check via modem during operation of <br /> the soil vapor extraction system <br /> The soil vapor extraction and groundwater treatment systems operated on a continuous basis this <br /> quarter except for two periods of down time because of fouling and temperature controller <br /> problems On June 12, fouling In the air strapper caused low air flow and a system shut-down, and <br /> in the middle of July, the catalytic oxidizer temperature controller malfunctioned and required <br /> replacement <br /> 42o201 02 QTR <br /> H❑®GROUNDWATER❑❑TECHNOLOGY <br />