CASE STUDY: Retro - Coa t™ Achieves Site Closure by Meeting Environmental Screening Levels Lombard Street Retrofit – San Francisco, CA Retro-Coat™ (patent pending) was selected to mitigate vapor intrusion within a structure built in 1907 that had been impacted by both a former underground storage tank and a local dry cleaner. Indoor air samples taken prior to application showed chlorinated solvent-based PCE and TCE levels above

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