Indoor Air & Soil Vapor Assessment
Los Angeles, California
Background
In February 2026, McAlister GeoScience was retained to conduct a Phase II Environmental Site Assessment (ESA) consisting of indoor air sampling and soil vapor characterization at a multi-tenant commercial building in Los Angeles, California (the Subject Property).
The purpose of this investigation was to document the nature and extent of potential vapor-related impacts associated with the former operation of a dry-cleaning facility at the Subject Property following prior remedial activities. A total of two (2) indoor air samples and one (1) soil vapor sample were collected to evaluate current site conditions.
Environmental Assessment
The Phase II investigation included collection of indoor air and soil vapor samples, which were analyzed by a California-certified laboratory for volatile organic compounds (VOCs). Analytical results were compared to applicable Environmental Screening Levels (ESLs) to assess potential health risks.
The VOCs reported in the analytical results were predominantly below their respective ESLs.
Key Findings
• Most VOC concentrations were below applicable ESLs.
• PCE was detected above its ESL in soil vapor but was not detected in indoor air.
Conclusion
Based on the sampling results, indoor air conditions at the time of investigation did not indicate active vapor intrusion of PCE into occupied spaces. The identified VOC concentrations in indoor air can be addressed through building-level improvements, including HVAC upgrades incorporating activated charcoal filtration and elimination of potential indoor sources of volatile compounds such as cleaning products and new furnishings.
Outcome
The investigation provided the Client with clear documentation regarding current indoor air and soil vapor conditions at the Subject Property following historic dry-cleaner operations. With defined data and practical recommendations, the lender and property owner are equipped to make informed decisions regarding property management and future use.