Thank you for following us. Please visit our Center of Technical Excellence Blog at http://blog.langan.com/.
Posted in General | Tagged Center of Technical Excellence, Langan, Langan Engineering & Environmental Services, T&R, Treadwell & Rollo, Treadwell and Rollo | Leave a Comment »
Posted in Civil, Environmental, General, Geotechnical, Seismic | Tagged Civil Engineering, environmental engineering, Geologist, Geotechnical engineering, happy holidays, Langan, Langan Engineering & Environmental Services, Langan International, Treadwell & Rollo, Treadwell and Rollo | Leave a Comment »
Posted in Awards, Uncategorized | Tagged 11.1.11, Langan, Langan Engineering & Environmental Services, Langan International, SPUR Urban Center, Treadwell & Rollo | Leave a Comment »
In October 2011 The California Environmental Protection Agency’s Department of Toxic Substances Control (DTSC) released two documents related to Vapor Intrusion issues. The document titled “Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air” represents a revised document that incorporates public comments. This document, considered by the DTSC to be a final version outlining a stepwise approach to performing vapor intrusion evaluations, includes recommendations for field investigation techniques (i.e. soil gas, sub-slab, and air indoor sampling), screening of sampling results, and specific information relevant to California for use with the commonly applied Johnson and Ettinger vapor intrusion model. A description of changes to its prior guidance document is included.
The DTSC also released a final version of its Vapor Intrusion Mitigation Advisory document, which provides details on selection and design of vapor intrusion mitigation systems and operation and maintenance of mitigation systems.
Finally, the DTSC also noted that it plans to finalize its document titled “Advisory – Active Soil Gas Investigations” during the Fall of 2011. This document will provide greater detail on planning and designing field investigations related to soil gas characterization than other DTSC documents.
The link to these documents on the DTSC’s website can be found here. For more information on Vapor Intrusion, please contact Michael Chendorain.
Posted in Environmental | Tagged air indoor sampling, CA DTSC, DTSC, Environmental, environmental engineering, Johnson and Ettinger, Michael Chendorain, soil gas, soil vapor, Soil vapor extraction, sub-slab, vapor intrusion, Vapor Intrusion Mitigation, Vapor Intrusion Mitigation Advisory, vapor mitigation, vapor mitigation systems | 1 Comment »
Dr. Ramin Golesorkhi will be speaking about the earthquake ground motions provisions of ASCE 7-10 which is a reference code for the IBC 2012 and the 2013 version of the California Building Code (CBC). These new provisions present a significant change from previous codes. The presentation will discuss the implications of these changes and give examples from a comparative study in California. The presentation will be today, Wednesday October 19th, at the URS Corp Office at 1 Montgomery Street, in the One Montgomery Tower from 5:30-7:30.
Dr. Golesorkhi has more than 23 years of experience in seismic analysis and foundation engineering. He provides engineering consultation for projects involving deep excavation, tunneling, foundation support and settlement, vertical and lateral evaluation of pile foundations, stability of earth structures, seismic soil-structure interaction, seismic hazard evaluation, ground response analysis, liquefaction potential evaluation, evaluation of ground improvement techniques, and other geotechnical and environmental projects.
For additional information on our seismic services, contact Ramin Golesorkhi.
Posted in Seismic | Tagged California Building Code, earthquake, earthquake engineering, Geologist, Geotechnical, Geotechnical engineering, geotechnical services, ground motions, Ramin Golesorkhi, seismic, seismic design, seismic engineering, seismic engineers, seismicity | 1 Comment »
Please join us on 11.1.11 for our 1st Anniversary Celebration at the SPUR Urban Center at 654 Mission Street, San Francisco. The event will occur from 6 – 9pm. To RSVP, please click here. For additional information, please contact Julie Frankel.
Posted in Awards, Uncategorized | Tagged 1st Anniversary, 654 Mission Street, Julie D. Frankel, Julie Frankel, Langan, Langan Engineering & Environmental Services, SPUR Urban Center, Treadwell & Rollo, Treadwell and Rollo | 2 Comments »



