San Francisco Bay Branch Meeting - Structural Influences on Contaminant Transport in Fractured and Faulted Sandstone


The San Francisco Bay Branch is pleased to present:

Structural Influences on Contaminant Transport in Fractured and Faulted Sandstone


Nick Johnson, Ph. D.

Wednesday, March 21st


The speaker spent the past ten years participating in the characterization of a large, former industrial site set in fractured and faulted sandstone.  A degree of consensus on the nature of the site’s fracture flow had become established, however his task was to evaluate the potential influence of the site’s faults on the pattern and magnitude of groundwater advection.  This talk summarizes his analysis of several data sets from this data-rich site, including a nearly 70-year monitoring record, several long-term aquifer tests, and a wide variety of data collected from hundreds of borings.  Coming from a more sand-and-gravel background, his challenge was to evaluate the potential for hydraulic barriers and preferential flow associated with the site’s faults in the context of remarkable observed hydraulic responses associated with the apparent high hydraulic diffusivity of the fractured sandstone. 


Nicholas (Nick) M. Johnson, PhD, PG, CHg Nick received his PHD from the University of California, Santa Cruz, Ph.D., Earth Sciences in 1994. He received an MS from the University of Arizona in 1980. Nick is a Professional Geologist and a Certified Hydrogeologist. He is currently a Senior Managing Scientist at Exponent in Oakland. 

-$50 for Members
-$55 for Non-Members
-$10 for Student attendees 

GRA San Francisco Bay Branch is interested in supporting university science students. Our Scholastic Sponsorship Program is an opportunity to publicize your business while contributing toward a good cause. Your sponsorship will be acknowledged in the announcement, at the meeting, and space will be provided for a small display and brochures. Please contact Abigail Madrone at for details.

If you have any announcements or questions, please contact the Branch President, Eric Sandberg ( at 415-786-7244, or Branch Treasurer David W. Abbott ( at 510-928-4543.

We are actively looking for potential speakers. If you have a topic or suggestion, please contact the Branch President, Eric Sandberg ( at 415-786-7244.


Wed, March 21, 2018
5:30 p.m. - 8:30 p.m.

Event has ended


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