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The sample was analyzed in the field immediately after collection for <br />organic compounds as methane. Within 72 hours, the sample was ana- <br />lyzed by Central Coast for the 10 VOCs specified in Guidelines. The <br />regulatory detection limits for these tests are listed under "Air" on <br />Table 1 of Appendix A. Analytical procedures are included in Appen- <br />dix D. <br />2.5 RESULTS <br />Analytical results are summarized in Tables 2, 3, and 4. Complete <br />analytical reports are included in Appendix E. Appendix F presents <br />the field information, including date and time of sampling, landfill <br />gas well purge volumes and times, and names of sampling technicians <br />for each landfill gas and integrated surface walk sample. <br />The gas monitoring wells located in areas with buried refuse contained <br />methane from 63 to 76 percent (see Table 2). Carbon dioxide, the sec- <br />ond largest gas component in the wells, was present at 24 to 31 per- <br />cent. By-products of anaerobic degradation, methane and carbon <br />dioxide are generally the major landfill gas components in areas of <br />decomposing refuse and typically exhibit this range of values. Oxygen <br />was detected between 0.02 and 1.5 percent by volume, and nitrogen was <br />detected between 0.5 and 5.9 percent by volume. The low oxygen and <br />nitrogen concentrations indicate that no air was infiltrating the <br />wells during sampling. <br />• . IM- 1 •..�•a= <br />Analytical results for VOCs in the well samples are presented it <br />Table 3. Eight of the 10 specified VOCs (vinyl chloride, benzene, <br />1,2-dichloroethane, methylene chloride, tetrachloroethylene, <br />1,1,1 -trichloroethane, trichloroethylene, and chloroform) were detect- <br />ed in one or more well samples. Well W-1 exhibited the highest <br />PJ9 9390405.00D 2-5 Rev. 0 09/07/88 <br />Mon Associates <br />