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Second Quarter 1994 Status Report 4 Golden Grain Company, Manteca Bean Facility, 229 Moffat Blvd , Manteca, CA July 18, 1994 The soil vapor extraction and groundwater treatment systems ran continuously this quarter except for three occasions The following is a list of the days that the remediation system was not operational 04/07/94 The system was automatically shut down as a result of a high LEL alarm condition The condition was traced back to moisture in the vapor lines The LEL sensors were removed, cleaned, and recalibrated prior to being reinstalled The system was restarted and was operating under normal conditions within the same day as the problem occurred 04/12/94 The system shutdown was not caused by an equipment malfunction A power outage in the Manteca area is believed to be the cause of the failure The equipment was restarted on the same day the problem occurred 05/31/94 A relay on the soil vapor extraction system blower was not operating correctly The blower was repaired and normal operation began immediately During this quarter of operation, there were no releases of untreated groundwater or untreated system effluent vapors System shutdowns were planned or triggered by the system interlock, which functioned as designed to bring complete system shutdown in the event of equipment malfunction Calculations using TPH-g concentrations and system flow rates obtained during field visits indicate that approximately 84 pounds of TPH-g were removed from the sod by the VES during this quarter The cumulative amount of hydrocarbons removed by the VES since start-up is estimated at 3,320 pounds Less than 1 pound of TPN-g was removed from the groundwater during this quarter Calculations for mass removal from the vapor and groundwater treatment systems for the second quarter are included in attachment 3 During this reporting period, the VES was monitored each week The influent and effluent vapor concentrations were measured for TPH-g using an FID Values measured during site visits this quarter, as well as historical data from October 1993 are shown in table 3 The average destruction efficiency of 994 percent was calculated using weekly FID readings of the catalytic oxidizer effluent vapor stream for the operational period from March 10 through June 9, 1994 All effluent readings collected were below the 100 parts per million by volume (ppmv) TPH-g discharge limit specified by the Unified Air Pollution Control District permit (Permit No N-2825-1-0) to operate On May 19, 1994, samples were collected from the groundwater treatment system and analyzed for TPH-g, BTEX, total lead, organic lead, and ethylene dibromide at a California-certified laboratory Laboratory analysis reports and corresponding chain-of-custody records for the sampling event on May 19, 1994, are included in attachment 4 Results of system historical analyses are summarized in i 5510R024 420 EE�GROUNDWATER TECHNOLOGY, INC