off your cellphone ringers so we do not have any distractions. there is one exception to that rule, and that would be larry bair. i hear that your ringtone is "we are the champions," and that one is ok with me. speaking of larry, the giants were pleased to share with us the world series trophy. [applause] the giants have brought so much to this city, sharing with us this incredible trophy. it is just outstanding. it will be at the giants' boost today when we have a break -- booth today when we have a break. you can take a few photos.

but do not take it home with you. you'll be hearing from me from time to time today, so i will keep this short. to kick off our events and provide welcoming remarks, allow me to introduce our newest rock star -- mayor ed lee. has shown that he is a natural for the job. i have been closed to him for decades. he is the head of the human- rights commission. he went on to become the city purchaser. mayer brown appointed him to be the director of public works, and he spent several years as city administrator. i never would have thought that ed lee would be mayor of san francisco. because he is such a can-do kind of person, such a great problem solver, but i never thought of him as someone running a political institution, and san

francisco is certainly that. but he has shown tremendous prowess in the job. i think he is perfect for it. most recently, his move to keep twitter headquartered in san francisco was a big thing and showed a major commitment to keep jobs here, and i want to thank mayor lee for stepping up and doing that. obviously, as san francisco goes, and in many ways, so goes the region. i really appreciate the work that ed lee is doing. if there is some way we can often -- if there is some way we can convince him to stay on, your suggestions are welcome. ladies and gentlemen, without further read too, welcome s.f. mayor, ed lee. [applause] mayor lee: good morning.

thank you for that wonderful introduction. i just want to preface it by saying, when you get a call in your in hong kong, and that call comes from former mayor willie brown, it is hard to say no. i have taken up this challenge. i want to thank you, members of the bay area council, for your tireless work periods it is significant -- for your tireless work. it is significant this group has come together this morning around the critical issues of the bay area. education. infrastructure. sports. there is no issue more important today than the bay area's ability to compete and win business in the global economy. in san francisco, creating and retaining jobs has been a top

priority, because that is what helps keep families in san francisco and helps them thrive. we are leading the way in education, health care, and the environment. for the past three months, we have made significant progress in making sure our business climate is alive and welcoming. let's begin with our central market payroll tax exclusion. yes. we have got a very important final vote today that allows us really to refresh our efforts, to rebuild midmarket street. and that is for the company that is so important, the twitter company. but not just twitter. twitter knows they are going to be an anchor for us and they are already attracting other businesses such as burning man, the cultural arts. you're going to see these cultural arts agencies, all live along midmarket. that is what we are trying to do.

we're trying to make improvements to encourage business to continue coming to the area, and to create improvements for the whole area. the city is also working on improving blight. just last week when we had our first vote, not celebrating just because of twitter, we walked together -- with twitter, with the shorenstein group, and began at the noon substation on fifth street. we are going to make it safe for everybody. you are going to be able to walk that street and not feel the traditional fears you felt before. we are going to improve the blight. i am proud to be joined by some many great reporters and advocates. market street is in inderal in the diverse makeup of san

francisco. we will make sure it becomes a bustling central locale for innovation. we are also thrilled twitter is joining us in central market. that stretch is going to be opened for change. it is not just to have twitter there. but as you know, and as events unfolded throughout the world this past beginning year and last year, we saw the product of twitter changing world of dance all across -- world events all across the international stage. after 3:00 today, we can simply announce that twitter is made and engineered in san francisco, with 400 million users across the world. thank you for your support on that. [applause]

and of course, just last week, we simultaneously announced that burning man will be moving into the bay area, and already i am tickled with some invitations to go to burning man this year. i do not know if i am going to do that. but they just announced a five- year lease over 18,000 square feet to be located on midmarket street. that is a wonderful follow-up. there will be more to come. twitter has many other firms that will follow. you want to be there with the creativity they will bring to midmarket as well. these are great additions we have in the works. it is also no surprise that the 34th america's cup is coming to san francisco in 2013, and we are hard at work in preparing that event. as you know, we announced the people plan, the plan which will move some 200,000 people every

single day, on march 31. two years out, we are aggressively trying to meet our commitments for this spectacular 2013 event. we are trying to set a new standard because we know that not only moving to hundred thousand people will be -- 200,000 people will be a challenge, but sustaining the events will constantly be our challenge. we are aiming to make the 34th america's cup the most transit, bicycle, and pedestrian-friendly as forcing event -- sporting event in our history. strategic adaptability and the positive legacy. anything we build must last all long time -- a long time, beyond the america's cup event. we want to make sure all our

neighborhoods -- chinatown, the mission, and north beach, the south east sector -- all come for this event. we are engaging transit advocates, and neighbors, and the public, beginning to ensure that we meet transportation needs of the races, as well as our residents and commuters. we are doing this, as i said, the san francisco y, in partnership with the public -- the san francisco way, in partnership with the public and our stakeholders. the transportation plan is up on the website already. we will end -- we will wait until the end of may before we published the final document. between now and then, we will have a great amount of feedback. we are leveraging resources and enthusiasms to set new standards, and we will leave a

positive long-term legacy. let me reenforce the america's cup is about bringing thousands of jobs to san francisco and generating revenue for our city. we are also working on one of the hardest topics not only we are facing, not only the region is facing, but the state of california is facing. that is pension reform. i am working hard with staff, labor groups, in my budget team. one of the most pressing issues we have to deal with is to make sure our city remains solvent through the hard economic times, like the ones we are still facing, and that challenges us to make sure we are still reforming the system. i still got everybody at the table. and we are about to launch into our reconfirmation in a couple of weeks. it is my hope that we keep the

city together and we produce one ballot measure in november and the changes we have in pension reform our long term. that we fix it and we fix it for everybody for generations, so they will have a dignified pension system to work with. this all ties as back to investing in our neighborhoods and our communities. we can make the positive investments to keep our families in our city. and i want to make sure you here this, because i want sentences get to be the northern terminus for high-speed rail in the state. -- i want san francisco to be the northern terminus for high- speed rail in the state. we are committed to that. it will be the most beautiful terminal he will see in your lifetime. -- you will see in your lifetime. we are working hard to keep the city together. i find every day, people are

telling us they want jobs. they want their dignity to be reflected in having a good job. i cannot do it without making sure we have unity at our board of supervisors. i am very mindful that every single day i have a private meeting with each member of the board of supervisors, a different member every other day, talking about what they need, treating them with respect, making sure the dialogue is open. and this new-found unity will help me as i enter on my first one-hour discussion with the board of supervisors. wish me luck. [laughter] because i do think we need positive dialogue in this city. the fractious times are over with. we need a unified dialogue. i have every faith that this unity will bring about the success that wean are known for

-- that we are known for. and by the way -- though, giants. let's have another win in this city. we can handle it. thank you very much. [applause] >> thank you, mayor lee.

>> welcome to the department of building inspection brown bag lunch. you are always invited to join us on the third thursday. today, we have a special program about san francisco's neighborhoods geology. we have frank, the geotechnical engineer who will walk us through a lot of this. we also have an architect who knows a lot about the history of the city. he keeps his eyes open and has a lot of information to share. we also have the chief building inspector. we are going to go through this by having frank give us a brief overview of the geology of sentences go. then we're going to look at a series of slides around the city. and see how the geology of the city affects the environment.

their special problems and issues that arise we will try to answer questions as we go, particularly related to how the environment release to the underlying geology of the city. those are questions that rarely get asked. this is a chance for you to join us and ask your questions as well. welcome, frank. i see that you brought a big aerial photograph with overly geology. >> it is a big google map with overly geology. the different colors depict the different formations or deposits beneath san francisco. san francisco is a young environment.

it is a relatively young environment. the basement rock beneath san francisco is known as the franciscan complex or formation. it is throughout the city, most notably twin peaks, edge hill, telegraph hill. every once in awhile, you hear about those who make the news with a rock fall or landslide. usually occur in the telegraph and twin peaks. . above the rock are the soil deposits. the most common is dune sand. it is nothing but rocks that has been worn down from the sierras and deposited along the beaches. the wind blew that dune sand

over most of the city. it is this mustard color. on the avenues, it is very thick. it can be up to 400 feet thick. as you moved south across slope boulevard, that is the tolar foundation. it was named after the first to score every in -- after the first discovery in the cemetery. the man was out there and noticed this material was unique. he started mapping it. he traced it all the way up to slope. the dune sand generally has the consistency of sugar. it is fine grained sand. it is usually loose. it is poorly graded. the colma foundation can be the

same stand but it is denser. it may have to play in it. it is much stronger. it is an excellent supporting material. it is up to 10,000 years old on the dunes and. the colma is 40,000 to 60,000 years old. in some areas, it may be as old as 130,000 years. as you move across the city and get to the border, you get to ground that was originally under water. that sits on top of bay mud. wea is ak ve-- that is a very y with the consistency of jello that has been left in the

refrigerator for several days. the others are residuals soil. they are either a product of the weathering of the underlying law. peluvium is soil that has been deposited by gravity. san francisco, dune sand, colma, and the others. very simple. because san francisco is so young. -- because san francisco is so young, it is riddled by faults. i have a map that shows the faults across the bay area and san francisco. the granddaddy of all of these is the san andreas fault. it is the longest. it can generate the greatest

earthquakes. >> it is just south of san francisco. it goes offshore down here. >> from my house to the fault is about 3 miles on average. >> the closest area in san francisco to the fault is this area here in the southwest part of the city. people said that the closer you are, there are conditions that exacerbate issues. >> the fault's effect on development depends on the fault type and soil component. the san andreas is the main fault. there is the hayward fault. the difference between the two is that the san andreas is predominantly offshore. the hayward fault actually crosses beneath populated areas and poses a larger threat.

as we speak, there is a 67% probability of a major earthquake on one of these faults in the next 30 years. it is of major -- high probability. it is a magnitude 6.5. the 1906 was 7.9. the 1957 earthquake was 5.7 on the san andreas. the loma prieta was 7.1. it was so far with it we got a little effects of it. that is the overview of the geology. >> i would like to setup a wonderful old chart of san francisco from the 1850's and

1860's. let's look at this northeast corner of the city. it is really interesting. i am sure that frank has a lot to say about it. the thing i find absolutely surprising about this is that there is this large area called mission bay. out in the middle of the bay is mission rock. many of you have been to mission rock resort. this is part of the shore line now. look how far off shore it was in the 1850's. this has all been filled. many of these areas are now filled. let's talk about that. >> this is montgomery street. e have thembaradero -- now we have the embarcadero and marina.

this map is the infamous lipofaction map. the green areas are the areas that will have potential lip ofaction. that is a loss of strength of material when it is subjected to vibration. it can occur in sand and silt. those have to be saturated or below the ground water level. you can almost type dismount tie t --tie this map -- this area right here is the same as this one. it is all silt and will liquefy. the marina is in this area here.

you can correlate the advancement of the shoreline of san francisco with the potential for liquefaction. >> it is a perfect example. it is all sold and liquefaction. >> treasure island is unique. it was originally developed to be the location of the world fair with the understanding that once it was finished, that would become the location of san francisco international airport. it is 11,000 feet long. in those days, the thought that was more than enough to land any conceivable airplane. they thought it was ideal. they said that we have all kinds of sand out in the bay from the sacramento river. we will take the stand out of the bay and create this island. the sand is loose and below the

water. it liquefied in 1957. it liquefied in 1989 during the loma prieta. it was similar to what happened in the marina. >> as they move along and developed treasure island, the developer also has to provide stabilization programs. >> the sand has to be strengthened so that it will not liquefy. the buildings have to gain support below the sand in more confident material. >> we were talking about the waterfront. here's the very building. here is the intersection of the water and the land. the area where the ferry building is now was what? >> it was silt. to create the embarcadero, they

had all of this exposed rock. they decided to mine telegraph hill for the rock and build a levee and bill in behind the levee. they blasted the rock. it was illegal but they did it anyway. they took the rock and built a rock dike all along here. beneath the fill the latem are of this mud with the consistency of jello. that layer may be as thick as 110 feet. >> is bad dyke founded on the mud -- is the dike founded on

the mud? >> it is. when they dumped the rock into the bay mud, it was like dumping rock into jello. it went down into the mud so that they could build off of that. it then took the angle of repose. it is stable. san francisco came and built piers on piles over the top into the water. >> the piers are built up over the water. >> refusal is when you cannot advance the pile anymore.

this is under the bay mud over there. they meet refusal. they gain support and bearing on top. saltwater attacks concrete. in the old days, they did not understand the effects of salt water, chloride on concrete and steel. a lot of these piles may have started out 24 inches in diameter. they may only be eight or 10 inches in diameter now. whatever steel was in there is long gone all along the waterfront. >> wonderful buildings. at the double dog and a beer. >> this is wonderful.

it is right on the waterfront. it is due piles. >> that is the location of what is now the san francisco port authority? >> yeah, port offices. and there is a new office there and slip. this is one of the few places where they recently provided a small boat docking on the waterfront. there are very few places where you can stop on the waterfront, and have built a brand new public dock. so we're down near the waterfront. what do we have here? >> in many areas, it is shallow enough that working with the owners, we can convince the owner that maybe he could use some below grade parking, and we make the decision to