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14 September 2004 <br /> AGE-NC Prod ect No 03-1100 <br /> Page 9of9 <br /> • Benzene with a primary MCL of 0 001 mg/l <br /> • Toluene with a primary MCL of 0 15 mg/1 <br /> • Ethylbenzene with a primary MCL of 0 7 mg/l <br /> • Xylene with a primary MCL of 1 75 mg/1 <br /> • MTBE with a primary MCL of 0 013 mg/1 <br /> 42 CLEAN UP GOALS FOR SOIL AND SOIL VAPOR <br /> Numeric soil-specific clean up goals have not established by the regulatory agencies Typically,the <br /> concentration trends of analytical data collected from extracted soil vapor are analyzed to determine <br /> the effectiveness and needed duration of the soil remediation effort For the former Stefano's Gas <br /> Station,a declining concentration trend in soil vapor should indicate effective remediation of the soil <br /> vapor A minimum soil vapor extraction cleanup goal should be lack of detectable benzene Benzene <br /> should be non-detect prior to any termination of the soil vapor extraction system <br /> Advanced GeoEnvkronmental,Inc <br />