Welcome to the blog and newsletter for the Association of Engineering and Environmental Geologists, Sacramento section.
Visit this site to learn more about the association’s recent news including relevant local projects, fundraising events, legislative activities, and publications. Visit the official website at aegsacto.org to RSVP to our monthly meetings or register as a member.
We hope you enjoy this new site, and let us know what you think using the comments section!
Please join us on Tuesday, May 18 on Zoom! We will be hosting the national AEG President William H. Godwin from the San Francisco Bay Area Chapter of AEG who will be giving a presentation titled Lessons Learned from the Baker Beach Landfill Removal Project.
Lessons Learned from the Baker Beach Landfill Removal Project
William H. Godwin, PG, CEG
National Association of Engineering and Environmental Geologists (AEG) President and San Francisco Bay Area Chapter Member
After a three-year planning, site investigation and design process, two Army-era landfills were removed from the steep 270 foot (80 meter) high bluffs above Baker Beach in the Presidio of San Francisco in 2007. The landfills had been created over a 50-year period during the last century by dumping of waste soil, construction debris and incinerator ash over the steep cliffs. High-value serpentine habitat and historic artillery batteries and earthworks surrounding the landfills, as well as locally unstable slopes prevented the construction of access roads to simplify the removal process.
Despite extensive pre-removal site exploration and analyses, once excavation and removal began the landfills were found to contain nearly double the amount of waste that had been anticipated, resulting in a significant increase in project cost. By using a combination of paddle conveyors, “spyder “walking excavators, off-road dump trucks and a bucket-brigade of long-reach hydraulic excavators the contractor was able to remove the waste soil and debris and adhere to the original project schedule.
A project post-mortem indicated that additional drilling and sampling during the site investigation phase would have likely revealed the presence of thicker fill deposits, allowing a more accurate estimate of the eventual waste tonnage and better estimates of the project’s final cost, albeit at a significant increase in the cost of the investigation.
This presentation was given at the 2007 AEG Annual Meeting in Los Angeles and the 2010 IAEG Congress in Auckland, New Zealand. Portions of this presentation have been updated.
William H. Godwin is a member of the San Francisco Bay Area Chapter of the Association of Environmental and Engineering Geologists (AEG) and is the current 2020-21 National President. He has been a practicing geologist for over 40 years and has been working as an independent geologic consultant since 2014 and as an on-call employee for several large geotechnical consulting firms. Mr. Godwin earned a Bachelor of Science degree in Geology from the University of Redlands, in Southern California. He is a licensed Professional Geologist (PG) and Certified Engineering Geologist (CEG) in California. He lives in Pacific Grove California.
The California Geological Survey (CGS) is seeking to hire a Civil Engineer with geotechnical engineering experience to add to our staff in the Essential Facilities Review Program. The Civil (geotechnical) Engineer will be responsible for reviewing geologic and geotechnical reports prepared by others for projects at public K-12 schools, community colleges, and acute care hospital projects throughout California. The position will be based out of one of the three main CGS offices (Sacramento, Los Angeles, or San Mateo) and is subject to ongoing telework in accordance with State of California and Department of Conservation policies. If you or someone you know may be interested and qualified for the Civil (geotechnical) Engineer position with CGS, please review the job duties and application requirements listed in the position postings for each of the three main CGS offices:
Please join us on Tuesday, March 23, 2021 from 5:30 PM to 7:00 PM PDT on Zoom! We will be hosting Professor Ross W. Boulanger from the Center for Geotechnical Modeling in the Dept. of Civil and Environmental Engineering at the University of California, Davis who will be giving a presentation titled Liquefaction: Lessons, challenges and opportunities. Register HERE!
Liquefaction: Lessons, challenges, and opportunities
Ross W. Boulanger, PhD, PE, NAE
Distinguished Professor and Director: Center for Geotechnical Modeling, Department of Civil and Environmental Engineering, University of California, Davis
Liquefaction during earthquakes has been the subject of extensive study for over half a century and is now routinely addressed in engineering practice using a wide range of technical approaches that depend on the project size and importance. These past studies have produced major advances in our scientific understanding of liquefaction phenomena and the engineering practices used to address liquefaction hazards, but there remain numerous situations where knowledge gaps and engineering practice limitations hinder the efficient mitigation of earthquake-induced liquefaction damage to our infrastructure and communities. This presentation examines a number of lessons, challenges, and opportunities regarding the evaluation and mitigation of liquefaction hazards, including aspects of site characterization, engineering analysis methods, challenging soil types, remediation methods, performance-based engineering procedures, and risk management approaches.
Professor Ross W. Boulanger is Director of the Center for Geotechnical Modeling in the Department of Civil and Environmental Engineering at the University of California, Davis. He received his PhD and MS degrees in Civil Engineering from the University of California at Berkeley and his BASc degree in Civil Engineering from the University of British Columbia. His research and professional practice are primarily related to liquefaction and its remediation, seismic performance of dams and levees, and seismic soil-structure interaction. His honors include the TK Hsieh Award from the Institution of Civil Engineers, the Peck Award, Norman Medal, Huber Prize, and Casagrande Award from the American Society of Civil Engineers, and election to the US National Academy of Engineering.
The Board for Professional Engineers, Land Surveyors, and Geologists administers the Certified Engineering Geologist (CEG), Certified Hydrogeologist (CHG) and Professional Geophysicist (PGp) examinations.
These exams are computer-based (CBT) and administered once a year in early October. This year the exams were recently re-scheduled to October 7, 2021. To apply for approval to take any of these examinations, you must submit your application and all required documentation by the final filing date of May 3, 2021.
If you have additional questions, please visit the Board for Professional Engineers, Land Surveyors, and Geologists website: https://www.bpelsg.ca.gov/
The AEG Sacramento Chapter is hosting its annual Student Night meeting on Tuesday, April 20th, 2021. Register for the free virtual meeting HERE. Both students and professionals are highly encouraged to attend to provide the best experience possible. The meeting is a great opportunity for geology students to interact with professional geologists in the environmental & engineering geology fields.
Poster Presentation Information:
Students (both undergraduate and graduate) are encouraged to submit posters to present during the virtual meeting to highlight their thesis research and/or classroom research for discussion/input in a friendly setting. For students who are graduating soon, it is a great way to network with prospective employers. If you are planning on displaying a poster, please notify Matt Buche at firstname.lastname@example.org. The first 8 students who sign up and display posters will be awarded $50. Attendees of the meeting will vote on the best poster, and the winner will receive an additional $100!
5:45 – 6:00 pm Virtual Meeting Open to Guests
6:00 – 6:30 pm Round-Table Introductions
6:30 – 6:45 pm General Announcements
6:45 – 7:30 pm Student Poster Presentations
7:30 – 8:00 pm Student Scholarship and Poster Awards
One $1,000 scholarship to junior or senior year undergraduate students
One $1,500 scholarship to graduate students pursuing a master’s degree with an environmental or engineering geology emphasis
Applicants must be currently enrolled in one of the following four-year universities: CSU Chico CSU Sacramento UC Davis Univ. of Pacific CSU Fresno CSU Stanislaus UC Merced
Undergraduate: Scholarship applicants must be in their junior or senior year and have a declared major in geology or a related earth science discipline.
Graduate: Scholarship applicants must be a first- or second-year graduate student pursuing a master’s degree with an environmental or engineering geology emphasis, such as hydrogeology, earthquake and geologic hazards, etc.
Scholarship applicants must have a cumulative grade point average of at least 2.5 on a 4.0 scale and will be scored based on their grade point average within their study major.
The application deadline is 5:00 pm on Thursday, April 15th. See the application materials for full eligibility requirements and instructions.
Please join us on Tuesday, February 23 on Zoom! Our speaker will be Mr. Alex Morelan will give a presentation titled Geologic Observations of the July 2019 Mw 6.4 and Mw 7.1 Ridgecrest Earthquake Sequence The event will begin at 5:30PM.
About the Topic:
The Ridgecrest earthquake sequence began on July 4, 2019 with a M w 6.4 earthquake at 10:33 am PDT at a depth of 8.7 km. The epicenter was located about 18 km east-northeast of the city of Ridgecrest within the Naval Weapons Station China Lake (NWSCL) property. This event was preceded by several small foreshocks a few days prior to the event. Surface rupture from this event was expressed as a zone of surface faulting over 17 km long, that consisted of several strands of en-echelon stepovers striking northeast-southwest with left-lateral displacement. Rupture appears to have propagated from the epicenter toward the southwest. Aftershock patterns of the M w 6.4 event largely followed the northeast-southwest surface rupture trend with a perpendicular northwest-southeast L-shaped pattern that developed near the epicenter at the northeast end of the fault zone. This northwest-southeast aftershock pattern appeared to be weakly coincident with a discontinuous zone of northwest-striking, previously mapped Holocene-active faults. This pattern of orthogonal faulting and seismicity hinted at the possibility of cross-fault triggering, like what was observed in other earthquake sequences such as the 1987 Elmore Ranch – Superstition Hills earthquake sequence (e.g. Hudnut et al., 1989). About 34 hours after the M w 6.4 event and numerous large (M5+) aftershocks, the M w 7.1 mainshock event occurred at 8:19pm PDT. The epicenter of the mainshock event was located approximately 10 km northwest of the M w 6.4 epicenter at a depth of 10 km. Surface rupture from this event occurred along a northwest-southeast striking fault zone coincident with the northwest -southeast M w 6.4 aftershock seismicity. Displacements on the M w 7.1 trace were primarily right-lateral and extended bilaterally away from the epicenter over a distance of ~50 km. This presentation will include a discussion of the overall earthquake response by geologic teams, surface rupture characteristics, and slip measurements compiled to date for both Mw 6.4 and Mw 7.1 earthquake events, including an overview of data collection methods.
About the Alex Morelan:
Alex Morelan is an engineering geologist with the California Geological Survey (CGS) in Sacramento. He received both his BS (2011) and PhD (2019) at UC Davis, after which he started at CGS. Alex’s dissertation focused on tectonic geomorphology and earthquake geology. His focus areas included slip rates along the southern San Andreas fault, alluvial fan deposition along active range fronts in eastern California and Nevada, and using photogrammetry to archive ephemeral earthquake offsets after the 2014 Napa earthquake.
The Geology of Sacramento has just been published. The book totals almost 400 pages; includes collaborations from 24 different authors representing 11 state agencies, 5 academic institutions, and 7 consulting firms; and more than 30 peer reviewers, as well as more than 47 additional professionals providing technical support. To celebrate this event, the publishers are offering several pricing bundles that include previously published works (while supplies last), and all pricing bundles include FREE SHIPPING!
Option 1: purchase GEOLOGY OF SAN FRANCISCO (I9780898635003) and get 20% discount of the list price ($79.95), plus free shipping. TOTAL = $63.96. This is a savings of $16 off the list price and about $8 shipping. (Use code SFGEO at checkout!)
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Option 3: purchase both the GEOLOGY OF SACRAMENTO and the GEOLOGY OF SAN FRANCISCO and receive a 30% discount off the list price of ($159.90), plus free shipping. TOTAL COST = $111.93 (Use code NCALDUO at checkout!
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Please note that you must include the discount code when ordering.
To order these books, call 1-650-591-3505 between 8 am and 5pm EASTERNSTANDARD TIME. Even though this is a California prefix, the warehouse is in Massachusetts. Due to the COVID-19 Pandemic, you may have a problem getting through, so please be patient. Shipping will likely take a couple of weeks.
These timely Geologists are Essential Workers magnetic bumper stickers let people know that geologists all over the country are still hard at work, despite the challenges of COVID! Now is the time to order one for yourself by donating $25 to the AEG Foundation, if you haven’t already done so. Since we can’t meet in person right now, we are using an “Each One Reach One” approach to get the word out, so please help us by reaching out to just one of your geologic colleagues with the message about the bumper stickers. It’s all for a very good cause—-the AEG Foundation will use the money to provide more students with scholarships, which will be even more important this difficult year! Thank you from the AEG Foundation, and all the students who will benefit!Donate here: www.aegfoundation.org/fund-drive