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' Former Manna Pro Site Page 12 <br /> Project No 207 3 <br />' Remedial Feasibility Study <br /> • <br />' 5 A rough estimate of costs in constant dollars over the lifetime of project for each of <br /> the four remedial methods to be roughly similar (see Appendix B) Indeed, the <br /> monitoring costs associated with the natural attenuation method are estimated to be <br /> somewhat greater than any of the other methods This cost basis does not account for <br /> a discounted cash flow assessment of the Net Present Value of the total project costs <br />' 6 The pilot test data for air sparging are such that a substantial degree of uncertainty <br /> exists regarding the rate at which gasoline vapors can be extracted The uncertainty is <br /> due to the duration of the pilot test which was insufficient to demonstrate the rate at <br /> which hydrocarbons under over 10 feet of water column will be mobilized for <br /> transport to the groundwater surface and eventual capture and removal <br /> i7.2 Recommendations <br />' A Remedial Action Plan (RAP) should be prepared which will describe the engineering <br /> designs, methods and protocols to be used to install and operate a remedial system based on <br /> soil vapor extraction and air sparging <br /> 1 <br /> I <br /> 1 <br /> 1 <br /> 1 <br />' 2937 Veneman Ave,#13240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />