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4 <br /> extracted from VEW-4 during this time period. The well also yielded approximately <br /> 35 scfm soil vapor flow. Very low hydrocarbon concentrations (<10 ppmv) were <br /> detected in the field. TPHg and benzene concentrations were non-detect in the lab <br /> sample collected on February 2nd. No influence (induced drawdown or vacuum) was <br /> observed in proximal wells while extracting from VEW-4 indicating no connectivity <br /> between this deeper well and the shallower extraction wells. The screen interval for <br /> VEW-4 starts at 45 fbg, which is where the screen intervals for the shallower extraction <br /> wells end. <br /> 3.4 GREENHOUSE GAS(GHG) EMISSIONS <br /> In April 2008, the United States Environmental Protection Agency (EPA) issued their <br /> technical primer, "Green Remediation: Incorporating Sustainable Environmental Practices <br /> into Remediation of Contaminated Sites". The EPA defined Green Remediation as 'the <br /> practice of considering all environmental effects of remedy implementation and <br /> incorporating options to maximize the net environmental benefit of cleanup actions". In <br /> response to this primer, CRA has begun incorporating sustainability into remedial <br /> evaluations. Therefore, the carbon footprint for the DPE system has been included in <br /> this shutdown request. <br /> A carbon footprint is the quantity of GHGs attributable to the actions of an individual, <br /> organization, or project. The quantity of a project's GHGs (carbon dioxide, methane, <br /> nitrous oxide, sulfur hexafluoride, hydrofluorocarbons, and perfluorocarbon) is <br /> expressed as a kilograms (kg) carbon dioxide (CO2) equivalent. The GHGs are <br /> converted into a carbon dioxide equivalent using a global warming potential factor. <br /> A carbon footprint inventory or calculation is an accounting of the amounts and sources <br /> of emissions/sinks of GHGs,expressed as carbon dioxide equivalents,attributable to the <br /> existence and operation of an organization. The completion of such an inventory <br /> provides an essential foundation for the management and reporting of GHG emission. <br /> The boundaries of a carbon footprint inventory define what activities are to be included <br /> and excluded in the calculation. The boundaries of the remediation alternatives' carbon <br /> footprint inventory include onsite activities and the transportation of materials and <br /> waste. <br /> In calculating the carbon footprint for the DPE system, emission factors were estimated <br /> from the equipment specifications or taken from the 1998 GHG Protocol launched by the <br /> World Resources Institute and the World Business Council for Sustainable <br /> Development. The project boundary for estimating GHG emission for the DPE system <br /> XXXXX(XX) 7 CONESTOGA-ROVERS&ASSOCIATES <br />