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L <br /> �✓ Section 6 <br /> L Conclusions and Recommendations <br /> 4L <br /> The analytical results of the soil and grab groundwater samples collected by Tetra Tech during <br /> L this site assessment did not reveal elevated petroleum compounds around the former underground <br /> diesel tank. The laboratory data confirmed field observations of no obvious petroleum <br /> Lcontamination in the soil or groundwater. The findings of this investigation, coupled with the <br /> concentrations reported during UST removal, indicate that no significant impact from the diesel <br /> UST has occurred. No further assessment or remedial action at the site appears warranted at this <br /> L time. Based on all data collected to date Tetra Tech recommends closure of the site. <br /> LThe analytical data from the stockpiled soil sample reported no detectable petroleum <br /> hydrocarbons, aromatic volatile organics or organic lead. The analytical reports confirmed <br /> Lfield observations of no petroleum contamination. Based on the results, the excavated soil <br /> does not require handling or disposal as a regulated waste. The soil appears to be suitable <br /> either for backfill or for disposal at a sanitary landfill. <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L <br /> I <br /> L <br /> L <br /> TETRA TECH:Castle Rock Forest Fire Station,Preliminary Site Assessment Report Page 15 <br /> I <br />