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Site Closure Case Study

Site Closure

Car Wash
Western Riverside County, California

Closure was obtained at a car-wash site in western Riverside County.  The car-wash is located on the top of an east-west trending ridge underlain by consolidated, well-cemented Pleistocene sandstone of the Pauba Formation.

It was discovered that gasoline was present in the subsurface sandstone when new gasoline dispensers were installed at the site.  The Riverside Department of Environmental Health ordered the property owner to conduct an investigation to determine the extent of gasoline contamination in the subsurface.

M&A conducted a subsurface investigation and determined the following:

The Regional Water Quality Control Board concurred with the conclusion that the site was not a threat to human health, public safety, or the environment and issued a site closure letter.