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i <br /> August 28, 2001 <br /> Project 62400145 <br /> Mr Sam Savlg F' %�ti�,l j frcV10ES <br /> Public Health Services <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 65202 <br /> Dear Mr Savig <br /> Subject: Remedial Action Results <br /> The Earthgrains Company <br /> 2651 South Airport Way <br /> Stockton, California <br /> Remediation system start-up at the above-referenced facility occurred on April <br /> 25, 2001 This correspondence provides a summary of remedial results to date <br /> Future remedial status will be reported with groundwater monitoring results on <br /> a quarterly basis <br /> The air sparging system has been operating at four to five cubic feet per minute <br /> (cfm) while the soil vapor extraction system has been operating at 25 to 35 cfm <br /> Interruptions of system operation have occurred due to the local energy crisis <br /> and for carbon exchange events The system is monitored during weekly site <br /> visits to ensure efficient operation and permit compliance <br /> A table summarizing days of system operation, recovered vapor concentrations, <br /> and the total pounds of contaminant removed is included with this <br /> correspondence The table was developed to demonstrate compliance with the <br /> system air emissions operating permit but also provides valuable information <br /> about the remediation effort Soil vapor concentration (ppm TPH) observed <br /> from the weekly laboratory analysis of vapor samples is reported in the column <br /> entitled C(inf), influent concentration Soil vapor extraction flow rate (cfm) <br /> observed from the weekly monitoring of a flow meter is reported in the column <br /> entitled Q(mf), influent flow rate The total pounds of contaminant removed by <br /> the soil vapor extraction system is tabulated in the column entitled Total PE <br /> (unc), the total potential to emit Additonal operational notes are included with <br /> the table to document carbon change-out events and changes in system <br /> operation <br /> `PHILIP LNVIRONMFNTAL SERVICkS CORPORATION <br /> 210 West Sand Bank Road • PO Box 230 • Columbia,IL 62236 0230 <br /> (618)2817173 • (800)733-7173 • Fax(618)281 5120 <br />