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F <br /> Waadward•C[yde Consultants <br /> ,. 2) The hydraulic conductivity of the sands beneath the site range from 10410 <br /> 10-5 cm/sec. <br /> 3) Phase separated hydrocarbons are not present at the site but may be observed in <br /> groundwater after pumping begins. <br /> 4) ?'he highest concentration of BTEX at the site(25,700; 38,800:.4,000; and <br /> 15,900 ug/l) will be reduced to 1990 DOHS Action Levels and/or <br /> EPA MCL's of 1.0, 100, 680 and 17,300 ppb, respectively, for Drinking <br /> Water. <br /> 5) The contaminant plume can be separated Into four separate cells each of 100 by <br /> 300 foot dimensions, that are each dewatered by one recovery well placed in the <br /> center of the rectangular area. <br /> 6) The aquifer has a transmissivily of 10 gpd/ft; hydraulic conductivity of 1.0 <br /> gpd/ft2;porosity of 0.4; storage coefficient of 0.08; retardation coefficients <br /> ; •� for BTEX of 4.4; 13.3; 36.3 and 40.0, respective;;l; and a recovery well pump <br /> -� rate of 5 gpm. <br /> 7) Nutrients and oxygen are added periodically to the saturated zone via existing <br /> Injection wells to enhance insilu bloremediation of soils and/or groundwater <br /> bioremediation, or <br /> F,;. A vapor extraction system (VES) is Installed to remove contaminants from soils <br /> assuming a pump rate of 20 cfm. <br /> 9) Contaminated groundwater is treated at the ground surface and discharged to a <br /> POTW with a concentration.of less than 1 part per million. <br /> f <br /> 27 <br /> l <br />