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1 <br /> ' 11 REFERENCES <br /> * Department of Toxic Substances Control Advisory-Active Soil Gas Investigations, March 2010. <br /> * CalEPA, 2005. Use of California Human Health Screening Levels (CHHSLs) in Evaluation of <br /> ' Contaminated Properties,January. <br /> http://www.colepa.ca.gov/Brownfields/documents/2005/CHHSLsGuide.pdf <br /> ' * H&P Mobile Geochemistry,Standard Operating Procedures (SOP), EPA method TO-14A, TO-15, <br /> Revision 4. December 2007. <br /> ' *TEG-Northern California, Inc.Soil Gas Sampling Procedures. <br /> 1 <br /> 1 <br /> t 13 MILLER BROOKS <br /> 'Or� N. <br /> 1 <br />