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ATC Associates Inc <br /> ` 1117 Lone Palm Avenue, Suite B <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> ' ASS OCIATES INC Fax 209-579-2225 <br /> ' RECOMMENDAT1rONS <br /> Based on the results of the third quarter 2006 monitoring episode, we recommend the following <br /> ' • Continued monthly operation and maintenance of the soil vapor extraction system <br /> ' • Evaluate the hydrocarbon mass reduction and concentration trends to assure that the soil <br /> vapor extraction system is operating effectively <br /> • Perform fourth quarter 2006 groundwater monitoring and analyze groundwater samples <br /> for TPHg by EPA method 8015K BTEX by EPA Method 8021B, and oxygenate fuel <br /> additives by EPA Method 8260B <br /> ' • Continue to report groundwater monitoringands stem O <br /> y &M on a quarterly basis <br /> Please contact our office at 209 579-222I if <br /> ( ) you have any questions or comments <br /> Respectfully submitted, <br /> ' ATC Associates Inc <br /> ' V � /rK <br /> ' Vanessa Carney <br /> Staff Engineer gti a G EO, <br /> V No 4450 <br /> o <br /> t Lorraine M Sawyer -3�lc�8' <br /> Professional Geologist #4450 �T Exp <br /> or <br />' Attachments <br /> cc Mr Raymond Greer <br /> Mr James Barton, RWQCB <br /> 8 154 2951000 DO&ND lst-qtr-2006 doc 8 <br />