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�5 Third Quarter 1994 Status Report 5 Golden Grain Company, Manteca Bean Facility, 229 Moffat Blvd Manteca, CA September 26, 1994 effluent vapor stream for the operational period from June 10 through September 8, 1994 All effluent vapor 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-2625-1-0) to operate On August 18, 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 August 18, 1994, are included in attachment 4 Results of system historical analyses are summarized in table 4 Laboratory results indicate that all effluent water constituents analyzed were below the method detection limit Results of effluent water sample analyses were below the City of Manteca Public Works Department Industrial Wastewater Discharge Permit (Permit No 92-2) limits On March 3, 1994, an additional catalytic in-line water conditioner was Installed In the groundwater treatment influent piping This unit was installed to reduce the need for frequent cleaning of the site air stripper and thereby increases treatment system operational time Throughout the quarter, the air stripper was dismantled and Inspected to evaluate the effectiveness of the catalytic water conditioner . installed The water conditioner has been softening the water and making the air stripper cleaning easier and less frequent The water conditioner has not eliminated the fouling problem completely, but it has decreased the groundwater treatment system downtime by reducing the amount of air stripper fouling No discharge of untreated system water occurred during any site maintenance events A total of 413,500 gallons of water was treated between June 10 and September 8, 1994 Since the protect inception, approximately 2,294,853 gallons of water has been extracted and treated VAPOR EXTRACTION MONITORING On August 18, 1994, vapor samples were collected for analysis from the VES influent, the effluent of the lead vapor scrubber, and the effluent of the catalytic oxidizer The samples were analyzed for BTEX and TPH-g Total lead vapor samples were taken on August 24, 1994 Results of laboratory analyses are shown in table 5 Laboratory results indicate that effluent vapor concentrations for all compounds or analytes were below method detection limits These effluent analysis results are below the 100 ppmv TPH-g limits set by the Unified Air Pollution Control District's permit to operate Before the VES was sampled, 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 (tables 6 and 7) Readings were gathered to determine extraction well efficiency and the Influence of • the vapor extraction wells on the surrounding soil Results of field data collected this quarter 0J02R014 202 GROUNDWATER TECHNOLOGY, INC