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F� 12 September 1997 AGE-NC Project No. 97-0324 Page 5 of 6 4.4. METHANE AND ORGANIC VAPOR SURVEY The range of measurable vapor concentrations registered by the Micro FID was from zero to 1,000 parts per million vapors. However, no detectable vapors were noted during the soil vapor screening. Additionally no filed observations indicated the presence organic vapors. 5.0. SUMMARY AND CONCLUSIONS The following conclusions were drawn from the results of this investigation: • Ground water at the site was encountered at a depth of approximately 13 feet bsg. • No hydrocarbon-impacted soil was encountered at the soil boring locations on the northern boundary of the site, in relation to the Siena Lumber site. • No detectable concentration of dissolved hydrocarbons were present in the ground water samples collected from the same soil boring locations. • The lateral extent of the dissolved phase plume from the Sierra Lumber site has not reached northern boundary of the EF Mitchler site. • No measurable concentrations of organic vapor were noted during the soil vapor screening. The generation of methane in the soils at the site is not likely rased on the screening of the surface soils and therefore should not pose an environmental concern to the site. 6.0. RECOMMENDATIONS Based on the results of this investigation, AGE recommends the following: • No further subsurface investigations should be required at the site to determine if the Sierra Lumber release has affected the site. • As noted in a previous report for the site, the contents of the inactive AST located on the northern portion of the property should be disposed in an appropriate manner. • If any additional environmental concerns,not discussed in this report are discovered or occur after this investigation, please notify our office for further recommendations. Advanced CcoEnvironmental Inc. � J