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Problem Assessment Report <br /> January 29, 1992 <br /> �F Page -5- <br /> benzene, toluene, ethyl benzene, and xylene (BTEX) by EPA Method <br /> f}} <br /> 8020 . y;Y <br /> 4. 0 LABORATORY RESULTS <br /> Laboratory analyses indicate that neither gasoline nor <br /> gasoline constituents (BTEX) were. detected-.in the soil boring <br /> 1 <br /> samples . Laborato p ry .report sheets indicating analytical methods <br /> 'r <br /> used, detection limits, and results of analyses are located in <br /> ,d <br /> f Appendix C. <br /> F - <br /> 5. 0 CONCLUSIONS AND RECOMMENDATIONS <br /> Gasoline and gasoline constituents (BTEX) were not detected <br /> at laboratory detection limits in the soil boring samples <br /> i1 <br /> collected at the East Ada Avenue site. No petroleum odors or <br /> staining were noted in the. drill cuttings�or soil samples <br /> collected during the investigation. <br /> . _ C <br /> Based upon the information presentedLbove, it is likely <br /> I� <br /> that the horizontal and vertical extent of gasoline contamination <br /> is limited near the west end of the former tank` location. Condor <br /> recommends that the west end of the former tank site be excavated <br /> to remove remaining contamination. Visua =inspection (evidence_ <br /> of soil staining) and- field detection equipment (Organic Vapor <br /> I <br /> Analyzer - FID) will be used as a screening device during <br /> excavation to assist in evaluating the limits of contamination. <br /> It should be noted it may not be possible;� to remove all of the <br /> contaminated soil at the site without jeopardizing the structural <br /> I CONDOR <br />