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i First Quarter 1994 Status Report March 31, 1994 Golden Grain Company, Manteca Bean Facility, 229 Moffat Blvd , Manteca, CA 5 On February 17, 1994, samples were collected from the groundwater treatment system and analyzed for TPH-G, BTEX, total lead, organic lead, and ethylene dibromide at a state-certified laboratory Laboratory analysis reports and corresponding chain-of-custody records for the sampling event on February 17, 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 for were below the detection limit Analytical results of the effluent water sample were below the City of Manteca Public Works Department Industrial Wastewater Discharge Permit (Permit No 92-2) limits On December 10, 1993, and February 11, 1994, the air stripper was dismantled and cleaned for routine maintenance On March 3, 1994, the air stripper was dismantled for inspection prior to installing the catalytic water conditioner (in order to monitor the water conditioner's performance) There was no discharge of system water during these maintenance events A total of 381,046 gallons of groundwater water were treated between December 2, 1993 and March 3, 1994�7�► 5,u7 (0", VAPOR EXTRACTION MONITORINGD 13 On February 17 and 23, 1994, vapor extraction monitoring was conducted to evaluate the subsurface effects of the vapor extraction system (VES) and quantify the static vapor concentrations of TPH-G in the sods located within the VES treatment area On February 17, 1994, air samples were collected for analysis from the VES influent, the effluent of the lead scrubber, and the effluent of the catalytic scavenger unit The samples were analyzed for BTEX, TPH-G, and total lead Results of laboratory analyses are shown in Table 5 Laboratory results indicate that effluent concentrations for all compounds or analytes that were analyzed for were below detection limits These effluent analysis results were below the 100 ppmv TPH-G limits set by the Unified Air Pollution Control District's permit to operate Before the vapor extraction system 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 taken using a magnahelic gauge measured in inches of water vacuum Readings were recorded to determine extraction well efficiency and the influence of the vapor extraction wells on the surrounding soil Results of field data collected this quarter correspond with the expected vacuum effect for the surrounding area The vapor extraction pilot study performed in 1990 determined a radius of influence ranging from 55 feet to 90 feet depending on the air flow rate being pulled from the test extraction well The readings collected on February 17, 1994, showed influence 70 feet away from well MW-2 at a flow rate of approximately 88 cubic feet per minute (cfm) This corresponds with the expected radius of influence determined from the original vapor extraction system pilot study • 5510R014 020 GROUNDWATER HEITECHNOLOGY,INC