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AECOM Environment <br /> TABLE 2-Attenuation Factors for Preliminary Screening Evaluations <br /> Building Scenario Building Type Foundation Configuration Attenuation Factor <br /> Slab-on-Grade 0.002 <br /> Residential Crawl space 0.002 <br /> Existing <br /> Basement 0.01 <br /> Commercial Slab-on-Grade 0.001 <br /> Slab-on-Grade 0.0009 <br /> Residential Crawl space 0.0009 <br /> Future <br /> Basement 0.01 <br /> Commercial Slab-on-Grade 0.0004 <br /> Aprl 2010 <br />