Phase 1
Former Texaco Service Station
- Advanced two soil borings to test for soil type and petroleum impacts using Cone Penetrometer Test (CPT) and Rapid Optical Screening Tool™ (ROST™) technologies.
- Installed and sampled six groundwater monitoring wells
- Chemically analyzed soil and groundwater samples from onsite and offsite groundwater monitoring wells
- Completed and sampled three soil vapor probes to assess potential vapor intrusion risk
- Chemically analyzed soil vapor samples from onsite probes
Summary of Results:
Historically, impacts under the former Texaco Site are from gasoline. However, forensic analysis of the petroleum product detected in the channel is not similar to gasoline-dominant fuel compounds that would have come from the former Texaco Site. These data show that gasoline impacts at the former Texaco Site are not associated with the petroleum seeps detected in the channel.
Soil vapor testing was performed to assess the potential health risk
associated with former Texaco operation. Potential impacts to indoor air
quality to buildings onsite and nearby were evaluated. The results
indicated that petroleum concentrations in soil vapor at the tested locations
were well below levels established by the California Human Health
Screening Levels (CHHSLs) for residential indoor air.