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5.0 Conclusions and Recommendations <br /> Based on the laboratory results, current regulatory guidelines, and the judgment of IT, the <br /> following conclusions and recommendations are offered. <br /> • The geophysical survey reported an anomaly that suggests a UST might still exist <br /> at the site. <br /> The geophysical survey (Geocon, 2001) indicated that the USTs associated with the <br /> pump island may have been removed; however, there is no regulatory report on file <br /> to support this conclusion. <br /> • The soil samples analyzed during this site investigation were not reported to <br /> contain TPHg, TPHd, TPHo, BTEX or MTBE at concentrations exceeding the <br /> analytical method reporting limits. <br /> TPHd and TPHo and were detected in groundwater grab samples collected from the <br /> two HSA borings. <br /> BTEX and MTBE were not detected above the reporting limits in the two <br /> groundwater samples. <br /> • The groundwater data is interpreted to indicate that past use has impacted the <br /> groundwater quality and that a release of petroleum hydrocarbons may have <br /> occurred at the site. <br /> Three remedial actions and the associated costs are presented in Appendix E. <br /> Construction health and safety precautions related to potential chemical exposure that are <br /> recommended include: <br /> • Wearing coveralls (or equivalent), safety glasses, work boots, and hardhat as <br /> personal protective equipment to eliminate or limit exposure to soil. <br /> • Workers should not eat, drink, smoke, or apply cosmetics while working at the site <br /> when soil exposures are possible. <br /> The soil excavation should be screened with a Photoionization Detector(PID) or <br /> Flame Ionization Detector (FID) for levels of volatile organic gases. An action <br /> level of 5 ppm above background is recommended as a stop work level. <br /> • Workers should be provided hazard communications training regarding potential <br /> for exposure to chemicals,the signs and symptoms of exposures, and emergency <br /> actions if exposures should occur relative to petroleum hydrocarbons detected in <br /> the soil. <br /> AS4CMACOMMOARs tDH100APRAPJMM34780.2m.Coc 5_1 <br />