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1 <br /> Second Quarter 1995 Status Report 4 <br /> Golden Grain Company, Manteca Bean Facility,229 Moffat Blvd, Manteca, CA June 20, 1995 <br /> • <br /> Before collecting ambient sod gas vapor concentration data, the vacuum applied to the vapor <br /> extraction wells was turned off for a period of 5 days This allowed the sod to reach static <br /> conditions before the collection of the vapor samples from the four vapor extraction wells and MW-5 <br /> and MW-6 On May 24, 1995, vapor samples were collected from these wells and subsequently <br /> analyzed for TPH-g and BTEX (table 8) <br /> CUMULATIVE TREATMENT SYSTEM MONITORING <br /> A total of 280,684 gallons of water was treated between March 10, 1995, and June 9, 1995 Since <br /> the project Inception, approximately 3,550,697 gallons of water has been extracted and treated <br /> On May 18, 1995, samples were collected from the groundwater treatment system and analyzed for <br /> TPH-g, BTEX, total lead, organic lead, and ethylene dibromide at a California-certified laboratory <br /> Laboratory analysis reports and corresponding chain-of-custody records for the sampling event are <br /> included in attachment 4 Results of system historical analyses are summarized in table 4 <br /> Laboratory results indicate that all effluent water constituents analyzed were below the method <br /> detection limit Results of effluent water sample analyses were below the City of Manteca Public <br /> Works Department Industrial Wastewater Discharge Permit (No 92-2) limits <br /> CUMULATIVE REMOVAL OF TPH-G <br /> TPH-g concentrations were not detected in vapors removed from the sod by the VES during this <br /> quarter The cumulative amount of hydrocarbons removed by VES since start-up is estimated at <br /> 3,444 pounds Calculations using TPH-g concentrations in groundwater treatment system influent <br /> and the system flow rate indicate that less than 1 pound of TPH-g was removed from the <br /> groundwater during this quarter The cumulative amount of hydrocarbons removed from the <br /> groundwater is estimated to be approximately 7 pounds The absence of hydrocarbons removed by <br /> VES during this quarter can be attributed to steadily declining hydrocarbon concentrations within the <br /> soil <br /> 42020102 STA <br /> I ❑®GROUNDWATER <br /> EJEJ TECHNOLOGY <br />