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Manteca Bean Facility, 229 Moffat Boulevard, Manteca, California April 2, 1993 Golden Grain Company Page 3 in Table 3 During this quarter of system operation, analyses of discharge water indicated that the TPH- as-gasoline, BTEX, total and organic lead, and ethylene dibromide concentrations have been below permit limitations The air stripper was dismantled and cleaned on February 3 and March 4 during this quarter for normal maintenance in anter to keep the unit at peak operating efficiency, there was no discharge of system water during these maintenance events (See page 4 Treatment System Summary) During system operations for this quarter, 0 58 pounds of TPH-as-gasoline have been removed from groundwater extracted from beneath the sae The vapor extraction system was monitored each week during this reporting period The influent and effluent vapor concentrations were measured for TPH-as-gasoline using a flame ionization detector (FID) Values measured during site visits this quarter are shown in Table 4 The average destruction efficiency of 98 7 percent was calculated using weekly FID readings of the catalytic oxidizer effluent vapor stream for the operational period from December 29, 1992 through March 4, 1993 All effluent readings collected were below the 100 ppmv TPH-as-gasoline lima specified by the Unified Air Pollution Control District perms to operate Using the flowrates and TPH-G concentrations measured each week, the amount of TPH-as-gasoline removed from soils at the site can be estimated Based on the TPH-G concentrations and system flow rates obtained during field visas, approximately 843 pounds of TPH-as-gasoline were removed from the soil by the vapor extraction system during this quarter The cumulative amount of hydrocarbons removed by the VES since start-up is estimated 1613 pounds VAPOR EXTRACTION MONITORING On February 18 and 23, 1993, vapor extraction monitoring was conducted to evaluate the subsurface effects of the vapor extraction system (VES) and quantify the static vapor levels of TPH-G in the sods located within the VES treatment area On February 18, air samples were taken from the VES influent, the effluent of the lead scrubber, and the effluent of the catalytic scavenger unit for laboratory analysis The samples were analyzed for BTEX, TPH-G, total lead, and organic lead Results of laboratory analyses are shown on Table 5 Laboratory results indicate that effluent concentrations for toluene and f xylene are 0 6 and 1 part per billion respectively, while all other compounds or analytes that were V analyzed were non-detectable These effluent analysis results are wdhin the 100 ppmv TPH-as-gasoline limits as set by the Unified Air Pollution Control District permit to operate Following system sampling, the applied vacuum was measured at the two vapor extraction wells, and the induced vacuum was measured at the monitoring wells within the VES treatment area Readings were taken using a magnahelic gauge, in inches of water vacuum Readings were gathered to determine system efficiency and the radius of influence from the vapor extraction wells The values obtained are shown on Table 5B Results indicate a vacuum affect on the surrounding area, however, the applied vacuum at the extraction wells did not correspond with the system readings at the blower It GROUNDWATER QTR1 MCs TECHNOLOGY, INC