our long walk together, we talked about the relationship between the nature of a building, primarily its height, and the soil on which it sits. the slide is a good reminder of that. >> the ground has a natural period. the denser the material, the harder the material, the shorter the period of the ground. bay mud, which is present close to the shoreline, and the green area, the crown has a very long period. when the earthquake comes, there is a link of time that it takes the ground to go from one, slosh back and forth, measured in seconds. the deeper the bay mud deposits, the greater the length of time it takes for the motion to go one direction and back. so as you approach soft sites,

loose sand sites, bay mud sites, the period of the site is long. if you come along and build a tall building, and the ground is going like this, we know that tall buildings, the taller the building, the longer the period, the longer the time it takes to go from one side and back. iand the rule of thumb, every story that you add, it adds a 10th of a second to the period. if you have a 40 story building, you have a building that takes four seconds to go from one side to the other and back. now, that for second building is sitting on 100 feet of bay mud that also has a period of four seconds. the combination of those and

harmony, what happens is they amplify the motion and the building will collapse. example, the infamous bridge. in that case, the wind got in harmony with itself and it collapsed. what you try to do is you try to put a building on a site so that if the ground it is a long period, you want the building to be short. if the ground is short period, you want the building to be long. that is what happens when you get into the financial district. quite often, they will go down through the bay mud, put the structure on dense sand that has a very short period, and building is at 40 stories high with a very long period. even though the ground is doing this, the building is slowly moving. so there is damage, but there is

less risk of damage. alternatively would have done is layers and we've springs and all kinds of different -- and leaf springs and all kinds of different tools that can take the structure and put them on face. -- on phase. so when you look at a building like this, 10 stories, the period of that is about one second, 1.5 seconds. that is probably sitting on that sand or rock and that is about a quarter cent. so it is ideal. the ground is going like this, the building does not feel it. you feel it, but the building, it is not doing damage to the structure. >> the building next to it, let's say it is wood frame. what are thoseeperiods? >> there are less than a second. the beauty of a wood frame building, it is probably the most forgiving construction.

it squeaks, the plaster will crack, and if you don't have the soft story to deal with, you just have your cup of coffee and the one with your life. >> i guess this is turtle bill. >> grandview, turtle hill, san the mountain, -- sand mound, depending on how long you have been living there. >> this is northwest, of golden gate park. the nearest background, sunset and the richmond district? >> way out to the end, that is for smiley, the veterans hospital. this is for smiley. rock, rock, rock, rock, rock. here is hunters point. that rock is called serpent tonight. -- serpentinite.

along this zone, there is another rock type, volcanic rock. it is serpentinite. it is a very treacherous rock. if you go up market, you will see it where the met -- barack is exposed in that cut. -- for rock that is exposed in that it is cut. it can be hard work and have the consistency of soap and just slides. why is it like that? it is an intrusion. it is like toothpaste that was extruded through a crack in the earth. that means it was a sheer zone or fault, hundreds of millions of years ago, where it actually came up through and bubbled out and formed this band of serpentinite. adjacent to that is this wonderful rock. what is the other thin that is

bad about serpentineite? it contains naturally occurring asbestos, which is a carcinogen, known carcinogen. if you go to where st. mary's cathedral is, cathedral hill, that is one of the outcrops. there is a high percentage of serpentinite in the rock. in the old days, the 1930's, 1920's, san franciscans to not bother to deal with the disposal companies. they would take their garbage out the other side of twin peaks, bump their garbage, and shovel sand on top of it. so in the old days, you could go out there and build your home and be surprised that you would find sanitary landfill or construction debris landfills. they were prevalent out there. >> this is twin peaks?

>> going up to twin peaks. >> one form does not change much. >> eucalyptus trees have got much taller. that is not halt leading up to predict that is the hill leading up to there. fifth avenue, that area of san francisco. ucsf. that is this area right here. >> it is an earthquake hazard micro zone. >> again, another example of the wpa. the streets, they wanted to get to the top of the hill, said the duties beautiful walls and stairways. they are doing well. >> all of these hillsides have catalyzed the design and construction of the interesting foundations and sub framing.

>> up there, you'll find quite often, because it is rock, they have dug holes, filled it with concrete, put pulls up, and built their buildings. they have been there actually now 67 years. >> some of these are significant earthquake hazard? >> many of them, because they're not properly braced, because the foundations are not deep enough. the consequences could be significant during an earthquake. >> the tunnel opened that whole section up to development. did that lead to park side? >> west portal is right here. it this slope. westport open up this whole area down here, with the reservoir. the tunnel was built and two different ways. one of them was cut and cover,

the other was a tunneling machine. as they came close to the side of the hill, they dug down vertically, took out the dirt. they took the dart -- they took the dirt and replaced it as phil -- fill all along the lower part of market street. they filled in the ravine. >> thank you all very much. that was a heck of a tort of san francisco. thank you for your attendance. we hope to see you every third thursday right here.

>> i am ross mirkarimi, supervisor of our illustrious district 5. i am honored to be welcoming all of you to our district town hall budget meeting with major league and a well-represented sf of city hall. we will get into quite a few issues. i just want to say how much i am delighted to see all of you. if you will do me a favor and show a little pride for dick -- district 5, how about a round of applause for our great district and great city hall staff? i have to tell you, we have been together all day. we have watched a good portion of district 5 in the fillmore, in and around the area, and i have to say how ratifying it was to be with the mayor in the

fillmore, talking about truancy, talking about public safety, talking with da gascon, and we want to get down to brass tacks issues, not as public safety, but the root causes of job placement, giving our youth something to aspire to, giving an adult something they can turn to, being able to reach out. that is what tonight is part of. it is not just but district 5, but citywide. we are facing the fifth year. there is a chronic budget

deficit, or fourth year. it feels like the fourth year. we have navigated the budget in previous years. the difference in those years, there it is federal and state help. those deficits were considerably more than the local deficit we are facing now. the difference is that safety net that we would sometimes depend on from the federal and state government is not there now. san francisco is very much on its own. i have a hope and confidence that san francisco, for the partnership of the mayor's office and the departments and the board of supervisors, is able to navigate effectively this budget season, and also to balance the deficit, but not to the exclusion of us not taking care of the people here in district 5 in the fillmore and the surrounding neighborhoods.

i know that is what many of you have come here tonight, making sure the non-profit organizations, the service support agencies, are getting the support that they routinely expect and that they need. we will go into that discussion tonight. there are a lot of people here represented from all agencies. i will give the microphone to those who want to introduce themselves. we have a special guest in addition to all the other vip's. our new police chief, please give him a warm -- i think it is an exciting milestone. i'm going to start by asking trent to introduce himself and pass it down. then i will handed off to mayor lee.

>> i'm the director of the human services agency. it is an agency with two departments. >> i am henry from the san francisco housing authority, and we do all of the public housing within the area, including here in district 5. >> ed harrington, general manager of the public utilities commission. i am from the public utilities commission. is that any better? somebody turned it up. thank you. we bring you water and sewer services and power services in san francisco. thank you. >> ann, working with older adults and young girl adults with disabilities. >> bob, the acting superintendent of recreation community services. i want to welcome everyone to beautiful hamilton recreation center, and $18 million project.

we also have kimball across the street. we're excited about the capital projects and all the things going on. i also want to take a shameless plug to plug our summer camp. we have over 350 kids signed up. if you have kids, please go to sfrecpark.org. >> i'm greg wagner, the budget director. >> i am the other greg from the health department. >> my name is paul, representing the san francisco planning department tonight and working closely with folks in japantown. >> the evening. i am with the mta. we always see transportation in the -- we oversee transportation in the city. >> i am the third greg on the panel, chief of police. >> ann of northern station. >> ed riskin of the department

of public works. >> i maria, director for the department of children, youth, and their families. >> ladies and gentlemen -- >> thank you. thank you. thank you. can everybody hear me? all right. you may not see me, but you can hear me. ed lee, your mayor. i'm happy to join supervisor mirkarimi and all of the department heads here tonight. this is the ninth of the 10 town hall meetings we had all of the city to introduce to you the challenge of our budget, but most importantly, to listen to you tell us what san francisco's priorities ought to be, and i have been doing this because i believe that our budget should never be decided within just the

halls of city hall, that we have to go out to every community and open up the dialogue and allow you to tell us those priorities. i made that promise to the board of supervisors. all of our budget should reflect what people need, what people want the most, and then we tell you what the challenges are. we work together to resolve those. i am here tonight to represent hopefully an open dialogue with you about those needs and those priorities, and to engage you in that discussion with us. no major decision has been made on the budget yet. we are very close to a time frame in which the input of the public will be registered with us, and in addition to these town hall meetings, i have been holding meetings with community-

based organizations throughout the city, both in city hall, as well as like this afternoon, when we met at the african culture center, when we met with fifth year 60 community-based agencies, telling us what they needed for us to keep in mind as we went through this very trying time. we have a $306 million gap $306 million deficit to fill. out of a $6.6 billion the budget. we will go into more detail about how this will break down. the instructions that i have given to the departments, and to the commissions have been very simple and i want to share them with you tonight. i want for the city to be safe. so that all of you feel that this is one reason you want to live here. not just for yourself but for the friends that you invite, and

not only are safe but they feel safe. i also of the city to feel safe because we have a set of social services that the city can help provide in concert with the community, so that those adorable marble, the seniors and the youth, people with disabilities, and others who are challenged, and services that they can rely on to be safe, so that they can live decent lives. the city should be safe. i also want this to be a solvent city, that we have programs to pay for and afford. we cannot afford to go into debt so that we leave every year in front of us with unpaid bills. that will just make the city more difficult to manage. this is why we're doing a couple of things this year differently

from other years. we are talking about trying to plan better with this budget, to think about the five-year financial plan for the city. if you plan better, just like you do at home, if you plan a budget better, you will get the things that you need. if things happen and you do not plan for them, and you should have seen them, you -- we will always be in trouble. i am looking for something that will make us solvent in the future, this is the pension system that has been eating into the general fund. a good third of this at increases in the pensions and the employee costs that we have not taken care of. part of the long-term solution i am working on is to make certain that the whole city family is

working on a plan to lower the deficit as part of the increased costs. we will talk about that later and we will answer questions as well. i have a safe city i want to have, and a solvent city, and finally, we want to have a successful city. the reason that success is there is because i wanted to ask yourself, what brought you to send francisco? what made you make the investment that you made, that got you into a neighborhood? what brought me here was the excitement of being in a city that was culturally diverse. a city that respected all different cultures and ways of life. a city where you could talk to people without being offended by what people brought up. the city understanding diversity, celebrating

everything that we were doing in this city. if this is going down the street in a dedicated, green lane, with huge conventions going into town, with people who can speak german and japanese, to find their way into your neighborhood with japan town -- and these great restaurants. a city with great nightclubs, the bring over a million people here on a daily basis, to find their way for jobs and all the other things. this is a successful city. the diversity and the strong neighborhoods in the different languages, things that we love about the city. those principles, of the same city and a successful city, that is what i wanted. now we have a difficult decision, how do we bridge the gap of the budget, and how do we

make certain that this decision does not hurt people more, and maintain the level of services that they want and keeps you excited about the city, and keeps you committed to being here. i want to throw out to the civic engagement staff tonight, and through an agreement last with the board of supervisors, we funded part of the city administrator's office to make certain that we have language capabilities, not just in these capabilities by -- they have people on staff tonight to make certain, that english is not your first language, you can communicate your concerns to the city staff tonight. thank you very much for the civic engagement. i want to thank all of you for coming out and spending your time. i appreciate the input that you give here, and i take your

comments seriously. thank you very much. >> thank you. before i pass off the microphone, to give you a more detailed framework about the budget and what we are trying to advocate with us, i want to remind a few people that we have chairs up here, and we have this in the bleachers back there. you are welcome to join us up here. if anyone's need -- if anyone needs language translation, but the volunteer staff over here know. i want for people to know the number of representatives -- they have the tables in the back. and maybe after this particular town hall, you may want to engage in see how you can help to get involved.

i want to thank everyone for being here. we are going to leave the town hall to questions. many of these questions are written out. if you would like to ask a question, you can do so. if you want to -- i am more than happy to a identify who wrote the question. mr. wagner? >> thank you. i am the budget director, and my role with the city is try to -- trying to work with the mayor to make decisions about how we are going to balance the budget. i will be brief but i want to take you through a couple pieces of information about what we are facing over the next couple of months as we try to balance the budget,