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Soil and Groundwater Investigations

Stratus personnel have conducted soil and groundwater investigations at over 200 sites impacted by motor fuels (gasoline, diesel, and waste oil). Sites have been located in various counties of California, and in several other western states. Impact at some sites was limited to low concentrations and limited extent. Other sites have been impacted with high levels, resulting in extensive off-site migration of both dissolved and free-phase hydrocarbons.

This wide range of site settings and initial site conditions has allowed Stratus personnel to become familiar with fuel contaminant behavior in a wide variety of geologic settings, from high water tables in the clayey estuarine deposits of the San Francisco Bay area, to the gravelly, sandy, and silty fluvial setting of the Central Valley, to the interbeded layers of sand and clay soils of Southern California, and the fractured bedrock in the Sierra Nevada region.

Stratus utilizes the data collected during a soil and groundwater investigation to identify the sources and define the extent of soil and water impact. Our staff uses investigation techniques that include soil borings, monitoring wells, soil gas surveys, soil gas wells, and geophysical methods, to ensure that assessment is complete and representative.

Investigating hydrocarbon impact under such widely varying conditions has allowed Stratus personnel to develop a thorough understanding of the various exploratory methods, and to determine which method is best suited given the project objectives. Hollow-stem auger, air rotary, mud rotary, Odex™, GeoProbe™, Hydropunch™, SimulProbe™, dual-tube percussion, sonic percussion rock coring, horizontal rotary, and cone penetrometer testing (CPT) techniques have all been successfully employed during site investigations.