Conducting Subsurface Environmental Investigations in Urban Watersheds - Urban Watersheds: Geology, Contamination, and Sustainable Development - page 162

Over the last 25 years, environmental subsurface investigations have been the most com-
mon type of environmental investigation conducted. In urban areas, they have provided
extensive geologic and hydrogeologic information of the highest quality. Therefore, envi-
ronmental subsurface investigations can form the cornerstone of mapping the geology and
hydrogeology of an urban watershed.
The next chapter uses geologic and hydrogeologic information obtained from urban
environmental investigations along with other sources of geologic information and field-
work to map the geology of an urban watershed. This chapter provides the insight and
tools necessary to take geologic information from numerous subsurface investigation sites
within an urban watershed, and then generate a geologic map capable of telling the story
of the near-surface depositional history of that same watershed.
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