AES Environmental Consulting

Phase II Site Assessment

Leakage of a large quantity of unleaded gasoline from underground storage tanks (USTs) resulted in groundwater impact of significant lateral extent that migrated, parallel to local structural features in bedrock. Subsurface fractures, along which the gasoline migrated, were suspected and drilling of remediation wells into these fractures was recommended. Our challenge was to accurately map these fractures to determine the extent of the environmental impact.

aes professionals performed a review of geologic publications and aerial photography for the region to ascertain historical conditions and other potential sources of environmental impact. We conducted pump testing of existing monitoring wells and completed a series of dye tracer tests to determine groundwater flow.

Performed a geophysical survey of the suspected underground fracturing using electrical imaging technology.

aes combined these sources of data to precisely map two fracture sets on the site, and drilled remediation wells into these locations. Subsequent use of these wells during the remediation process confirmed the appropriateness of their location and their effective use to complete remediation of the site.