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i Closure Report 9 Golden Grain Manteca Bean Facility,299 Moffat Boulevard,Manteca,California July 16,1996 The results of the soil vapor extraction pilot test evaluation were used to determine the expected ' radius of Influence from vapor extraction wells and flow rates for the applied vacuum levels used in the test In addition, the contaminant concentrations were recorded for the test wells, at different vacuum and flow rates The radius of Influence for applied vacuum determined by the pilot test was ' from 80 feet to 90 feet from the extraction points, at the maximum tested flow rate of 130 cubic feet per minute (cfm) As expected,the radius of Influence decreased as the tested flow rate was reduced This Information was used to evaluate which wells would be selected as primary system vapor extraction wells Furthermore, the pilot test data was used to determine the proper equipment required to remediate the impacted zone and treat the hydrocarbon concentrations estimated to be in ' the system off-gas flow Data from the groundwater extraction pumping test were used to determine recovery well efficiency, aquifer properties, radius of influence, and recovery well capture zone In addition, contaminant concentrations were recorded for the effluent stream at the end of the test These data were ' subsequently used to determine the final design requirements for the groundwater extraction and treatment system as well as the estimated vapor discharge from the groundwater treatment equipment 32 Treatment System Description ' The results of the feasibility studies and pilot tests documented in the PAR, Remedial Action Plan (RAP), and addendum to the RAP were analyzed and the final treatment technologies for the site were selected The technology selected for remediation of the hydrocarbon impacted groundwater was extraction utilizing a submersible pump with treatment by a low profile tray air stripper(i a pump and treat) The treated groundwater is discharged to the City of Manteca publicly owned treatment works (POTW) and the vent gas from the air stripper is routed to the soil vapor treatment equipment The selected technology to treat the hydrocarbon impacted soil was vapor extraction Two monitoring wells (MW-2 and MW-3)were converted to vapor extraction wells and a 1 5 horsepower regenerative blower was utilized to extract vapors from the vadose zone The hydrocarbon vapors from the soil vapor extraction system and the vent gas from the air stripper were treated with a 250 standard cubic feet per minute catalytic oxidizer Additionally a lead scrubber was placed between the vacuum blower and the catalytic oxidizer to remove any lead contained in the extracted vapors Silica gel was used in the lead scrubber to absorb lead within the vapor stream The layout of the ' 42020211CR FLUOR DANIEL GTI