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15 June 1999 <br /> AGE-NC Project No 98-0450 <br /> Page 12 of 27 <br /> ' the smear zone <br /> The intrinsic permeability of clayey sand was 2 X 10 5 cm' and therefore would be adequately <br /> ' permeability for effective SVE remediation Additionally as shown on Figures 5 and 6, a localized <br /> coarse sand occurs within the dissolved hydrocarbon impacted area and SVE could be an adequate <br /> remedial alternative for the sand unit <br /> 4 2 5 Duration <br /> ' Cleanup periods for soil vapor extraction typically range from several months to several years Based <br /> upon the volume of impacted soil,hydrocarbon concentrations and the presence of fine-grained soils <br /> ' (clayey sand and sandy clay) at the site, 12 to 18 months are estimated to be required for <br /> remediation <br /> 4 2 6 Estimated Cost <br /> Prior to installation of an SVE system, an SVE pilot test would need to be conducted to assess the <br /> effectiveness of the alternative The cost to install an SVE pilot system and conduct a pilot test is <br /> ' estimated to range from $5,000 to $15,000 The costs for installation, operation and general <br /> maintenance of SVE systems varies, depending upon the particular system utilized for destruction <br /> of the extracted hydrocarbon vapors(thermal destruction, carbon adsorption,etc ) and the established <br /> cleanup goals The cost to install an SVE array and system ranges from $20,000 to $30,000 The cost <br /> to operate,sustain,monitor and sample an SVE system could vary from $40,000 to $60,000 per year <br /> The total cost of SVE for the duration of remediation (12 to 18 months) is estimated to range from <br /> ' $80,000 to $115,000 <br /> ' 43 IN-SITU BIOREMEDIATION <br /> In-situ bioremediation is an in-ground remediation technology that uses microorganisms to <br /> biodegrade organic constituents adsorbed to soil in the vadose zone Acceptance of this treatment <br /> technology within the regulatory community has grown recently, due to documented successful <br /> ' remediation of petroleum hydrocarbon contaminants at numerous sites in California, although it is <br /> difficult to receive waste discharge permits from the CVRWQCB to inject the required nutrients to <br /> the subsurface <br /> 110 <br /> Adianced GeoEnmronmental,Inc <br />