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CAME RIA <br /> September 12, 2005 <br /> Ms Viclu McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,3'd Floor <br /> Stockton,California 95202 <br /> Re Groundwater Monitoring Report—Third Quarter 2005 <br /> Former Shell Service Station <br /> 1071 North Main Street <br /> Manteca, California U (Y1 <br /> SAP Code 135570 4_ ? y <br /> Incident No 98995643 <br /> SJCEHD Site Code 506313 <br /> Dear Ms Mc Cartney <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting <br /> requirements of 23 CCR 26524 <br /> THIRD QUARTER 2005 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine)of San Jose,California gauged and sampled all site wells and <br /> prepared a summary table of field gauging and laboratory analytical data Cambria prepared an <br /> area well survey map (Figure 1) and a groundwater contour/chemical concentration map <br /> (Figure 2) Blaine's report,presenting the laboratory report,is included as Appendix A <br /> ANTICIPATED FOURTH QUARTER 2005 ACTIVITIES <br /> Blaine will gauge and sample the site wells and tabulate the data Cambria will prepare a <br /> groundwater monitoring report <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> A low concentration of MTBE was detected in groundwater from MW-1 this quarter and is <br /> within historical norms for the site No other gasoline constituents were detected in groundwater <br /> Cambria samples during this quarter's monitoring event Cambria has prepared a case closure summary <br /> EnVlf*nmental and will issue this document to the San Joaquin County Environmental Health Department <br /> Technology,Inc during September 2005 <br /> �0 Perkins Street <br /> .Wa CA 95476 <br /> Tel(707)93S-4850 <br /> Fax(707)935-6649 <br />