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27 :March 2000 <br /> AGE-NC Project No. 98-0450 <br /> Page 6 of 19 <br /> 3.0. CLEAN UI' GOALS <br /> A domestic water well is located within 2.000 feet of the unauthorized release area, therefore, the <br /> highest and best use of the water at the MBP site is for human consumption. Clean up goals should <br /> be established for soil and especially for ground water that will protect the beneficial use of the <br /> ,around water. <br /> 3.1. CLEAN t GOALS FOR GROUND WATER <br /> The clean up goals are to protect the beneficial use of the ground water as for drinking water. <br /> AGE proposes clean-up goals are based on the Maximum Contaminate Level (MCL) for the <br /> constituents of concern in drinking water. <br /> 'The constituents of concern and the associated MCLS are: <br /> • Benzene with a primary MCL of 0.001 mg/1 <br /> • Toluene with a primary MCL of 0.15 nig/l <br /> • Ethylbenzene with a primary MCL of0.7 mg/1 <br /> • Xylene with a primary MCL of 1 .75 mg/1 <br /> • MTBE with a secondary MCL of 0.013 mg/l <br /> 1,2, CLEAN UP GOALS FOR SOIL AND SOIL VAPOR <br /> Numeric soil-specific cleau3 up goals have not established by the regulatory agencies. Concentration <br /> trends of anaklical data collected from extracted soil vapor typically a measure of the effectiveness <br /> and needed duration of the soil remediation of fort. For the MBP site. a declining concentration trend <br /> in soil vapor should indicate effective remediation of the soil vapor. A minimum soil vapor <br /> extraction clean up goat should be lack of detectable benzene. Beniene should be non detect prior <br /> to anv termination of the soil vapor extraction system. <br /> VOLUMETRIC CALCULATIONS <br /> The estimated volume of soil and hydrocarbon mass to be remediatcd were based on analytical data <br /> from soil samples, field observations. field screening data and the inferred lateral/vertical distribution <br /> ldvatteed Geol-Anirmmkcntyl,Inc. <br />