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Applied Geologists and Geologic Hazard Assessment


 Damage from January 17, 1994 Northridge earthquake (USGS, public domain)

One of the most important functions that an Applied Geologist can undertake is to study and assess the risk of human injury and property damage posed by potential geologic hazards.  This allows the geologist to make recommendations to mitigate those hazards, thereby fulfilling a critically important societal need.


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Tanks are a Normal Part of Construction –The Basics Part 2 of 2

Anna Saindon, P.E., R.G., Ph.D., Member, AEG St. Louis Chapter
Environmental Senior Project Manager – Geotechnology, Inc.
 
Part 1 covered underground storage tank basics and closure by removal.  Part 2 covers complications to tank closures by removal and discusses the basics of in-place tank closures.  Some complicating issues when removing tanks include adjacent structures, utilities, poor subsurface conditions, and disruption to site activities.  In these instances, in-place closures may be the preferred option to keep operations going while staying safe and costing less than tank removal. 
 
Challenges to Tank Removals
 

Maintaining the structural integrity of adjacent building foundations becomes an expensive condition for tank removals due to the added cost and time to properly shore the excavation while performing the removal (Figure 1).  Similar issues occur if the tank is adjacent to a property boundary, roadway, or a retaining wall.  Utilities that cross over or near the tank would require protection and care before and during excavation activities.

If the tank removal is being conducted on an active site, or if the tank is in or near a roadway, other tanks in use, fuel pumps, or in an area of work, there could be a large disruption to the business or safety issues for multiple parties if removing the tank (Figure 2). 

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Tanks are a Normal Part of Construction – The Basics Part 1 of 2

Anna Saindon, P.E., R.G., Ph.D., AEG Member, St. Louis Chapter

Environmental Senior Project Manager – Geotechnology, Inc.

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