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Yi £, <br /> Third Quarter 2005 Groundwater Monitoring Report <br /> . Cohn Property,3755 Munford Avenue,Stockton,California <br /> Page 4 <br /> Analysis Performed <br /> Analysis Abbreviation Designation I USEPA Method No <br /> Total Petroleum Hydrocarbons TPH Fuel-Range 8015M <br /> as Gasoline 9 H drocarbons <br /> Benzene <br /> Toluene BTEX Aromatic Volatile 8021B <br /> Eth lbenzene Organics <br /> Xylenes Total <br /> Tertiary Butyl Alcohol TBA <br /> Methyl Tertiary Butyl Ether MTBE <br /> Di-isopropyl Ether DIPE Seven Fuel <br /> Ethyl Tertiaa Butyl Ether ETBE Oxygenates 8260B <br /> Tertiary Amyl Methyl Ether TAME <br /> Methanol <br /> Ethanol <br /> Modifications from Standard Monitoring Program: <br /> Three additional domestic wells were sampled on August 8, 2005 <br /> .} CONCLUSIONS <br /> Laboratory analytical results indicate the site has been impacted by petroleum hydrocarbons <br /> Concentrations of TPHg and BTEX are elevated in groundwater monitoring wells MW-1 through <br /> MW-4, and wells MW-6 through MW-8 and 2CC All oxygenates sampled were below <br /> laboratory detection limits <br /> Groundwater elevations decreased an average of 2 76 feet this quarter compared with the <br /> previous sampling event <br /> The soil vapor extraction system was operational on September 9, 2005 A discussion of the <br /> remediation system operation will be contained in the fourth quarter 2005 groundwater <br /> monitoring report <br /> RECOMMENDATIONS <br /> Apex recommends continued quarterly groundwater monitoring and operation of the soil vapor <br /> extraction system The next sampling event will occur in December 2005 <br />