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4� Fourth Quarter 1995 Status Report 4 Golden Grain Comp2ny,Manteca Bean Facility,229 Moffat Boulevard,Manteca,Caldomia December 21, 1995 GROUNDWATER TREATMENT SYSTEM MONITORING A total of 464,266 gallons of water was treated between September 8 and December 8, 1995 Since the beginning of operation of the remediation system,approximately 4,320,776 gallons of water has been extracted and treated On November 16, 1995,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 are Included in attachment 4 Results of system historical analyses are summarized in table 4 Laboratory results indicate that all treatment system 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(No 92-2) limits VAPOR EXTRACTION MONITORING During this report period,the VES was monitored each visit during pulsed 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 November 16, 1995, 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 5 and 6) 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 CUMULATIVE REMOVAL OF TPH-G TPH-g concentrations were detected in vapors removed from the soil by the VES during the two pulsing cycles this quarter, but the concentrations ranged from 0 to 5 parts per million (ppm),therefore, no measurable quantity of hydrocarbons were removed The cumulative amount of hydrocarbons removed by VES since start-up is estimated at 3,444 pounds TPH-g concentrations in groundwater treatment system influent were below the detection limit,therefore, no calculations were performed for mass of TPH-g removed by the groundwater treatment system during this quarter The cumulative amount of hydrocarbons removed from the groundwater treatment system since start up is estimated to be approximately 7 pounds • ❑❑® GROUNDWATER Ell]F-1 TF,CHNO[OGY