From ceginfo@u.washington.edu Mon Feb 23 14:26:24 2004 Received: from mxu6.u.washington.edu (mxu6.u.washington.edu [140.142.33.12]) by lists.u.washington.edu (8.12.10+UW03.09/8.12.10+UW03.09) with ESMTP id i1NMQNuL070120 for ; Mon, 23 Feb 2004 14:26:23 -0800 Received: from mxout2.cac.washington.edu (mxout2.cac.washington.edu [140.142.33.4]) by mxu6.u.washington.edu (8.12.11+UW04.02/8.12.11+UW04.02) with ESMTP id i1NMQMOM000442 for ; Mon, 23 Feb 2004 14:26:22 -0800 Received: from homer18.u.washington.edu (homer18.u.washington.edu [140.142.8.18]) by mxout2.cac.washington.edu (8.12.11+UW04.02/8.12.11+UW04.02) with ESMTP id i1NMQLAu016043 for ; Mon, 23 Feb 2004 14:26:21 -0800 Received: from localhost (ceginfo@localhost) by homer18.u.washington.edu (8.12.10+UW03.09/8.12.10+UW03.09) with ESMTP id i1NMQLjK016010 for ; Mon, 23 Feb 2004 14:26:21 -0800 Date: Mon, 23 Feb 2004 14:26:20 -0800 (PST) From: Civil and Environmental Engineering To: cegrads@u.washington.edu Subject: UW GIGSS seminars (fwd) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Uwash-Spam: Gauge=IIIIIIII, Probability=8%, Report='' This is announcement for two upcoming seminars by the University of Washington GeoInstitute Graduate Student Society. The lectures will be at the dates and times listed below in the Mechanical Engineering Building, Room 242. Announcements are posted around More Hall and presentation abstracts follow below. Thursday, February 26, 2004 4:00pm "Seattle City Light Boundary Dam Rockfall Evaluation" by Chris Robertson, Senior Associate, Shannon & Wilson Thursday, March 4, 2004 4:00pm "The Home Depot Development on the Rossman's Lanfill" by Dave Pischer, Senior Associate, Landau Associates Kathryn Petek President, Geo-Institute Graduate Student Society University of Washington -------------------------------------------------------------- "Seattle City Light Boundary Dam Rockfall Evaluation" by Chris Robertson, Senior Associate, Shannon & Wilson ABSTRACT: Shannon & Wilson's climbing team completed a rockfall evaluation of a 400-foot high rock cliff above a visitor's tunnel portal at Seattle City Light's Boundary Dam in northeastern Washington. The tunnel takes employees and visitors into the underground powerhouse. Because there have been several near-miss rockfall incidents at the portal, City Light planned to protect the entrance with a tunnel portal extension of sufficient strength to withstand the impact of a ten-foot diameter boulder free-falling 350 feet. The cliff averages about 75 degrees (measured from horizontal) and includes a 90-foot high overhang that is 15 feet deep. Shannon & Wilson geologists measured several profiles and rock discontinuity characteristics on the cliff. Based on our observations, measurements and kinematic analyses, we recommended designing the portal to withstand impacts from three-foot diameter rockfall; however, City Light chose to use their original conservative assumption of ten-foot diameter boulder. Normally we use the Colorado Rockfall Simulation Program (CRSP) to evaluate the rockfall trajectories and impact energies. Because CRSP was designed and calibrated using lower and flatter slopes, we recommended calibrating the program by conducting actual rockfall tests. Using measured rockfall data, we could modify inputs into CRSP. This approach allowed us to reduce design trajectories and impact energies by about 20 percent. City Light used our recommendations for their design of a portal extension that was built in 2003. The design used thick soil cover over a relatively thin shell to adsorb impact energy. -------------------------------------------------------------- "The Home Depot Development on the Rossman's Lanfill" by Dave Pischer, Senior Associate, Landau Associates ABSTRACT: The Rossman's landfill is a closed municipal solid waste landfill that covers an area of approximately 100 acres near the eastern city limits of Oregon City, Oregon. The landfill was initially closed in 1983 and subsequently covered with a vegetated, low permeability soil cover system. The Home Depot retail store development is located on a 16.7-acre portion of the closed landfill that is located adjacent to major highways in the area. This presentation summarizes certain geotechnical and environmental engineering design, construction, and monitoring provisions that have been incorporated into the Home Depot development. It briefly describes the Rossman's Landfill site from a regulatory agency perspective and how the development was determined to be compatible with the applicable landfill closure permit requirements at this site. Project aspects to be discussed include subsurface investigations, site grading and surcharging, pile foundation installation, refuse handling and disposal, soil cover restoration, installation of the landfill gas control and monitoring system, and monitoring of groundwater and landfill gas conditions during and after construction. .