Freon 11/Freon 113 Remediation Using HRC – Los Osos, CA

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Site Summary

A contaminant plume emanating from two waste disposal pits containing Freon 11 and Freon 113 was discovered at a former drug lab near Los Osos, California. In August 2002, Freon 11 and Freon 113 were detected in well MW-6 at maximum concentrations of 6,900 mg/L and 6,000 ?mg/L respectively. The initial remedial approach (during May 2002) was to excavate 100 cubic yards of contaminated soil in the source area to below the water table and line
the excavations with HRC to enhance anaerobic bioremediation. In addition, a barrier trench 200 ft long, 6 ft deep, and 2-2.5 ft wide was constructed and backfilled with HRC mixed soil to contain any offsite migration of the plume. Eight months after the initial HRC excavation and barrier trench application, contaminant concentrations were reduced significantly, however several months later contaminant rebound was observed. A second HRC application occurred in December 2003, this time HRC was directly injected into the source area through 32 push points. After the second HRC application contaminant concentrations were reduced to below MCLs.

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