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L� Third Quarter 1995 Status Report 4 . Golden Grain Company, Manteca Bean Facility,229 Moffat Blvd, Manteca, CA September 25, 1995 During this quarter of operation, there were no releases of untreated groundwater or untreated system effluent vapors System shutdowns were planned or occurred as a result of designed system safety interlocks, which shut down the remedlation systems to preclude untreated releases VAPOR EXTRACTION MONITORING During this report period, the VES was monitored each week during normal operation The influent and effluent vapor concentrations were measured for TPH-g using an FID Values measured during site visits this quarter are shown in table 3 On August 17 and 23, 1995, vapor samples were collected for analysis from the VES influent and effluent of the catalytic oxidizer The samples from August 17 were analyzed for BTEX and TPH-g, and the samples from August 23 were analyzed for total lead 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 parts per million by volume (ppmv) TPH-g limits set by the Unified Air Pollution Control District's Permit (No N-2625-1-0) to operate Before the VES was sampled, the applied vacuum was measured at the four operating vapor extraction wells and the Induced vacuum was measured at two 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 Indicate expected vacuum effects on the surrounding area and are within the same range as historical data collected GROUNDWATER TREATMENT SYSTEM MONITORING A total of 305,813 gallons of water was treated between June 9 and September 8, 1995 Since the beginning of operation of the remediation system, approximately 3,856,510 gallons of water has been extracted and treated Prior to the modification of the groundwater treatment system to liquid-phase granular activated carbon, the discharge permit was modified to require weekly Influent and effluent sampling and analysis for TPH-g and BTEX for one month Samples were collected on July 27 and August 4, 8, and 17, 1995 On August 17, 1995, samples were also collected from the groundwater treatment system and analyzed for total lead, organic lead, and ethylene dibromide at a California-certified laboratory Laboratory analysis reports and corresponding chain-of-custody records for the . sampling events 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 42020102 QTR 1El❑®GROL NDWATFR ❑❑❑TF;cHN0IAGY