November Meeting

Tuesday • November 19th 2019 • 6 – 9 PM

Old Market Pub & Brewery 6959 SW Multnomah Blvd, Portland, OR 97223

6 PM — Social Hour

6:45 PM — Dinner

7:30 PM — Presentation

Dinner pricing is as follows:

$25 – Private Industry • $20 – Public Agency • FREE for students

*There is a $2 surcharge for those who do not reserve by the deadline

Reservations can be made here: RSVP by 12 PM Monday, November 18th

Glaciolacustrine Earthflow Slides on US95

Speaker: Collin McCormick P.E.

Failure of a cut slope along US 95 just south of Bonners Ferry, Idaho impacted traffic long a major highway linking commerce between the US and Canada in March 2017. Initial field reconnaissance revealed groundwater seeps emanating from thin sand layers within glaciolacustrine silt deposits. Piping occurred in the seepage areas, resulting in flow slides and slumping of destabilized portions of the cut slope. Liquefied slide debris traveled down the cut slope over long runout distances, flowed into the ditch, and then onto the highway and across to the opposite side. This highly-fluid earthflow was difficult to contain. Concrete barriers placed along the edge of pavement were pushed by the leading edge of the advancing earthflow. Retrogression of the head scarp caused additional slumping and subsequent lobes of earthflow debris posed a continuing hazard to traffic.

Temporary mitigation measures were developed to address the immediate earthflow hazards. A temporary debris retention barrier was rapidly constructed using readily available materials to contain liquefied slide debris. Supplemental temporary mitigation measures were necessary to maintain highway safety through winter. In late summer 2017, the slope was laid back in the headscarp area to improve local stability and a network of French drains were installed in the slide debris perched on the cut slope to reduce water runoff and groundwater pressures.

Speaker Bio: David Scofield, PE 

Collin McCormick has worked as a geotechnical engineer at Landslide Technology in Portland, Oregon since 2013. He obtained is masters’ degree from the University of Washington and his bachelors’ from Oregon State University. Collin’s experience in geotechnical consulting has been focused on rockfall and landslide mitigation projects, embankment dam and levee evaluations, and geotechnical earthquake engineering.

Message from the Chair

Hello from the Chapter Board. Even though I was unable to make the meeting I understand we had yet another great turnout for Dr. Kevin Scott’s talk. Thanks to Dr. Scott for presenting and thanks to all that were able to attend.

This month we have been in flux as to who our presenter is going to be, but have thankfully found a replacement in Collin McCormick who is with Cornforth Consultants, Inc. Collin will be presenting on a landslide that occurred in northern Idaho along US 95 near MP 498.

On another note, the Chapter Board was contacted by the Oregon State Board of Geologist Examiners (OSBGE) in regard to attending their upcoming board meeting to discuss the implementation of Senate Bill 44. The goal of the bill and OSBGE’s approach is to increase access to the CEG without lowering standards. OSBGE noted they are not considering changing the requirement for CEG candidates to pass the specialty examination in engineering geology. A description of the goals for OSBGE is provided later in this month’s newsletter. In summary, the OSBGE board is seeking ideas on how to define new pathways for becoming a Certified Engineering Geology (CEG). As this process unfolds, OSBGE is interested in compiling ideas and concerns related to these new pathways. If anyone has ideas or concerns I would love to pass them along to OSBGE. Please send me an email of chat with me at the meeting.

As a friendly reminder, if you haven’t renewed your 2019 membership please take a moment to renew. Here is a link to the login page for the national website
( I was delinquent until last week, so it is never too late. Also 2020 memberships will be coming after the new year rolls around, so now is great opportunity to get current with 2019.

As always your support of the Chapter is appreciated. I look forward to seeing you at the meeting.

Ben George, P.E., R.G., C.E.G.
Oregon AEG Chapter Chair

Senate Bill 44 Update

The Oregon State Board of Geologist Examiners (Board) is starting work to evaluate how to address Senate Bill 44 (SB 44), which was passed by the Oregon Legislature in 2019. SB 44 amended Board statute to remove specific work experience requirements for specialty registration in engineering geology, thereby giving the Board flexibility to consider whether alternative pathways to the CEG registration should be allowed under Board rules. Nothing has been changed at this point, but the Board is anticipating a rulemaking effort to address SB 44. As a first step, the Board plans to start with a conversation at its 12/6/2019 quarterly meeting with representatives from the Oregon engineering geology community as a way to solicit ideas for and concerns about potential alternative pathways to the CEG. The Board meeting in December is only a first step, with the Board anticipating that this effort to carefully consider changes for the CEG registration will continue throughout 2020. The Board plans to actively engage CEGs from small and large companies as well as the public sector in this work to hear various perspectives. The Board’s goal is to identify alternative pathways to the CEG that would not reduce overall standards for minimum competency but would help potential CEG candidates gain the work experience and training here in Oregon that is necessary to become CEGs. No change in the Board requirement for CEG candidates to pass a specialty examination in engineering geology is proposed.

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