Baseline has prepared numerous Caltrans technical studies to support environmental review of highway improvement projects. Our services include:

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• Phase I Initial Site Assessment

• Phase II Preliminary Site Investigation

• Air Quality Impact Analysis

• Preliminary Geological Assessment

• Preliminary Noise and Vibration Study

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Baseline’s hazardous materials services for transportation projects include the evaluation of contaminants of concern in soil (e.g., aerially-deposited lead), groundwater, and structural materials (e.g., lead-based paint). Soil analytical results are often statistically analyzed prior to excavation to evaluate potential risks to human health and to minimize the generation of hazardous wastes for offsite disposal.

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Baseline’s air quality services for transportation projects include Air Quality Conformity assessments to analyze short-term construction emissions of criteria air pollutants; long-term operational emissions of mobile source air toxics; and greenhouse gas emissions. Baseline staff are skilled in using quantitative air quality tools such as EMFAC and air pollutant dispersion models (CALINE and AERMOD).