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URS <br /> Mr. Robert McClellon <br /> April 28, 2006 <br /> Page 2 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Methane was measured above 5.0% in VW-5S,VW-6S,EW-1,and EW-2. Based on the most recent <br /> quarterly results,the methane concentration remains above 5%,and we plan to install a remedial system <br /> to address this issue. Several remedial options are feasible,but it appears that a passive soil vapor <br /> extraction trench is the best option at this time. There are a few issues that we will need to address with <br /> San Joaquin Valley Air Pollution Control District(SJCAPCD)before proceeding with this option. If you <br /> have any questions,please give me a call at(916)679-2081. <br /> Sincerely, <br /> URS Corporation Americas <br /> Kamine <br /> enio Civil Engineer <br /> g <br /> Enclosures: Table 1 —Summary of Results <br /> Figure 1 —Site Plan <br /> K:\Wprocess\25532\WorldEnterprise\Quarterly Rpt\1Q06\CovLtrRpt.doc <br />