i would like to invite professor greg deerline and dr. shaw vindani to focus on strategies we can implement now and focus on later. i look forward to any questions you have during the presentation. >> supervisor kim: okay. thank you. >> i guess i'll speak from here. we have some slides if you could pull up, the powerpoint slides. it's always good to have a prompt here. it's a pleasure to be here, and supervisor peskin, i appreciate your interest. i've been involved in the pier tall building project for a number of years, so it's good to see this moving forward. again, dr. shah vindani is a practicing geotechnical engineer. we're here representing our team. i just wanted to mention john hooper, his team has designed the salesforce tower, many other tall buildings in san francisco and other cities. so this project is tasked with looking at tall buildings, both new ones in the future, existing tall buildings, and looking at policies and so forth to ensure their safety and improve their resilience. project started about a year ago, we had the

deerline. i'm not trying to play gotcha, but the a.b.b. paperwork that they submitted and the analysis that they did was on the other side of the building and on the d stacks, and i'm wondering why that is the data that is being relied on for the b-stack on the opposite side of the building. am i making any sense to you, gregory? does that make any sense? >> yeah. the latest report that i looked at is the cracked window report, the a.b.b., and this is the report that they filed in the last month or so, right, the last few weeks, which everything on that was on the cracked window, so that's what i've focused -- >> i have not looked at that for a couple of weeks, but my recollection was appended to that was information that they garnered from their investigation from a number of units, and they found, if my recollection serves me, that the curtain was performing well in the e and d stacks of the building, on the south side of the building, whereas these are on the mission side of the building. i believe that information was repeated in the a

stanford university professor greg deerline is one of the authors of the resulting report. >> current building codes are geared to protect life safety of a building, don't necessarily address recovery. >> deerline says 60 to 70 buildings used the same type of steel wells that fractured during the 1994 earthquake in los angeles. >> it was due to a combination of design and detailing practices, the connection details that were used, the weld metals that were used. >> the report suggests san francisco's tall buildings should be inspected for similar damage that might have gone undetected after the 1989 loma prieta earthquake. >> this is one of the first efforts to really look back and address, be proactive about starting to look more carefully at assessing those buildings. >> the study suggest there's is a link between the geotek cal aspects of construction and the integrity of tall buildings. the report compiles best practices in geotek cal engineering and foundation types and discusses acceptable limits of settlement. the final report will be released in november. in san francisco, mel

stanford university professor greg deerline is one of the authors of the rosht. >> current building codes protect the life safety of the building but don't necessarily address recovery. >> reporter: 60 to 70 buildings used the same steel welds that fractured in the 1997 earthquake. >> it was the connection details that were used, the welding processes. >> reporter: the report suggests san francisco's tall buildings should be inspected for similar damage after the 1989 earthquake. >> this is one of the first efforts to look back and be proactive and starting to look more carefully at assessing those buildings. >> reporter: approximately 60% of the buildings studied conteared primarily business uses, and the others are residential. the final report will be released in november. in san francisco, melanie woodrow, "abc7 news." >>> let's stay in san francisco for another few moments. the headliners of fleet week started flying. the blue angels did some practice runs above san francisco. the air shows start tomorrow. eric thomas is live with more on the story. you got to speak with onelots t. >

deerline is here along with folks in instruct well engineeri engineering. today on the 29th anniversary of the loma prieta earthquake, it's important that we learn from the mistakes of the past and how the city can adapt to a safer and more resilient future. with that i'll turn this part of the hearing over to our city administrator. i will be asking some millennium questions later, and mark zabaneh, who has some buildings that are cracking, could not be here because he has some buildings that are cracking. so he will join us at a later date, and with that, miss kelley, turn it over to present your project. >> good afternoon, supervisors. naomi kelley, city today. the tall building safety strategy is a pioneering effort by the city. it is the first of its kind in the nation, and represents 14 months ofyw