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Rapid Reduction of VOCs Results in Site Closure


Summary

fig-1-site-map3 Rapid Reduction of VOCs Results in Site Closure

Subsurface investigations at a dry cleaning facility revealed elevated levels of PCE and other regulated daughter products. A remediation technology was needed that could cost-effectively reduce the contaminants to the Washington Department of Ecology’s (WDOE) cleanup levels. HRC was chosen for groundwater remediation due to its ability to provide a low cost solution for site restoration. A groundwater monitoring program was created to assess the efficacy of remediation. The results from this program indicate a significant reduction in all contaminants and provides convincing evidence that the application of HRC to a chlorinated solvent contaminated site results in successful site cleanup.

table-1-site-goals Rapid Reduction of VOCs Results in Site Closurehrc-injection Rapid Reduction of VOCs Results in Site Closuretable-2-concentrations2 Rapid Reduction of VOCs Results in Site Closure

graphs Rapid Reduction of VOCs Results in Site Closure

Conclusions

Total VOCs were reduced across the HRC grid area shortly after injection. Wells MW-1, MW-3, and MW-5 (Graph 2) were situated within the HRC grid area and thus represented the behavior of HRC. The results indicate a significant reduction in the concentration of PCE and its related daughter products. PCE and TCE were reduced by 99.8% and DCE was reduced by 94.5%. Similar results were displayed in all other wells affected by HRC. As a result of HRC treatment, PCE, TCE, and DCE levels have been reduced to 10 times below the federal standards. Although VC has dropped to 4 times below federal standards, contamination levels still exceed WDOE MCLs of 0.2 ug/L. This site is expected to gain regulatory closure in the near future once VC is reduced to 0.2 ug/L.