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"v <br /> A S SO C I ATE S I N C . <br /> The vapor extraction system was offline for the fourth quarter 2004 and was removed by the original <br /> vendor without notice during the fourth quarter 2004. ATC is currently ordering another vapor <br /> extraction system for the site. <br /> RECOMMENDATIONS <br /> Based on the results of the fourth Quarter 2004 monitoring event, we recommend the following: <br /> • Conduct the First Quarter 2005 groundwater monitoring and sampling of MW 1 through MW 10, <br /> VWl, VW2, and CW and analyze samples for TPHg and BTEX by EPA methods 8015B and <br /> 8021 B, respectively, and MTBE, ETBE, TBA, TAME, and DIPE by EPA method 8260B. <br /> • Install new vapor system at the site. <br /> Please contact our office at(209) 579-2221 if you have any questions or comments. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> Nathan Christman <br /> Staff Geologist <br /> GEC),0 EC)r0 <br /> No. 4450 <br /> r •$!�li• <br /> a <br /> OF CAO'�o <br /> Lorraine M. Sawyer, PG <br /> CA Professional Geologist 94450 <br /> cc: Mr. and Mrs. Raymond Farmer <br /> Jim Barton, RWQCB <br /> s:lenviro1625961quartlyl4gr-2004.doc 8 <br />