Was cracked retaining wall built correctly?

February 8th, 2010

Engineering plans for retaining wall at the Hills of Rivermist

New documents offer more information about the retaining wall that collapsed at the Hills of Rivermist, a neighborhood in San Antonio built by Centex Homes. Comparing the wall’s engineering plans to a memo describing how the wall was actually built shows the retaining wall might have lacked crucial features:

  • The original engineering plans for the wall, drawn up by Russell Leavens of Enterprise Engineers Inc., show the wall was designed as a gravity wall, which relies on its own weight to remain stable. The contractor that built the wall is the aptly named Gravity Walls Ltd., owned by Chun Lambert. We wrote this story about a city inspection that concluded the wall wasn’t built with enough mortar. Less mortar means less weight, which could destabilize a gravity wall. Lambert hasn’t returned our calls.
  • After our story was published, city officials continued inspecting the wall. Development Services Director Roderick Sanchez wrote this memo last week laying out the reasons why he believes the wall can’t be patched up. Sanchez offers more details about how the wall wasn’t built to Leavens’ specifications. For example, the wall is missing a layer of limestone and fabric that was supposed to be set behind the structure to capture water and properly drain it through weep holes at the bottom of the wall.

    “There are multiple reasons why the wall may have failed,” Sanchez concluded. It could have been a combination of design failure, construction failure, or soil failure beneath the wall, he wrote.

  • The memo was posted on a city Web page set up to provide daily updates about Rivermist. The city posts new information at the end of every business day.

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    Daily Diversion: Bizarre political ad

    February 5th, 2010

    Crazy? Or sheer genius?

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    James O’Keefe: Journalist or prankster?

    February 4th, 2010
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    What exactly is an investigative journalist?

    Is a journalist someone who does the tedious work of digging through records, analyzing data, and finding good human sources to ferret out the truth?

    Or is a journalist someone who dresses up like a pimp, straps on a hidden camera, and tricks workers at ACORN to say really dumb things?

    Filmmaker James O’Keefe went the easy pimp route. Last summer, O’Keefe shamed ACORN workers in an undercover video, and O’Keefe’s conservative supporters praised his tactics as real shoe-leather reporting that has been neglected by the mainstream media.

    But investigative journalism is not a publicity stunt. It’s not a gimmick. It’s actually tedious, time-consuming work. And more people are beginning to understand that — thanks to one of O’Keefe’s recent stunts.

    O’Keefe and his pals were recently arrested for dressing like phone repairmen and infiltrating the office of Sen. Mary Landrieu in a federal building. After the arrest, even conservatives started raising questions about O’Keefe’s methods. John Hood at National Review Online put it this way:

    Whatever you think of these kinds of publicity stunts, they do not constitute investigative journalism. The earlier ACORN videos weren’t pieces of investigative journalism, either. It does the growing ranks of investigative journalists at conservative organizations a great disservice to invite a comparison of such publicity stunts with the hard, meticulous, and often boring work of exposing government waste and corruption.

    The New York Times published a Sunday story pointing out O’Keefe “is just one of a group of young conservatives who use political pranks and embarrassing recordings to upend what they view as overwhelming liberal biases on college campuses and in the culture at large.” Jon Stewart at the Daily Show said it seems like O’Keefe gets all his story ideas from porn movies.

    Instead of dressing up like a pimp to make a splash, why not dig up records to find out what’s really going on? That kind of work might seem boring to people like O’Keefe. But to the reporters who actually do this kind of work, sifting through documents, putting together the pieces of a puzzle, and discovering something no one else knows is rewarding and worthwhile.

    Give it a try, James. You might be surprised at the real stories that are out there.

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    San Antonio officials paid scant attention to towering retaining walls

    February 3rd, 2010

    Encino Ridge retaining walls in San Antonio

    Jen and I wrote a story that ran in Sunday’s paper and was posted online today about the lack of oversight of retaining walls in San Antonio. We looked at this issue after a retaining wall in The Hills of Rivermist, a neighborhood built by Centex Homes, split apart and jeopardized dozens of houses:

    Despite the growing popularity of towering retaining walls like the one that buckled last week, San Antonio officials have paid scant attention to the structures in residential subdivisions and can’t vouch for their safety.

    No one at City Hall tracked how many walls were built over the years as thousands of residents flocked to the Texas Hill Country and developers reshaped steep terrain for new homes.

    City inspectors never checked the walls.

    And, according to members of the real estate industry, it wasn’t widely known that a permitting process existed for tall retaining walls.

    “No one can find where the city has ever asked for or insisted on a permit,” subdivision developer Norman Dugas said. “I can’t find anyone who has ever gotten one.”

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    Daily Diversion: Old school news

    February 3rd, 2010

    And you thought today’s newspapers were archaic?

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    Essential tools for mobile journalists who can’t afford iPhones

    February 2nd, 2010

    Mashable came out with a nice list of resources for Web-savvy mobile journalists. But the list focuses quite a bit on iPhone apps. Not everyone is cool enough for an iPhone, including me.

    Here’s what I carry in my messenger bag — or as Jen calls it, my man bag:

  • A digital point-and-shoot camera that takes video. With a macro setting, this camera can do something that the iPhone can’t — perform as a portable photocopier. When you need quick copies of documents, you can simply take a snapshot of them. Very handy.
  • A notebook, pens and digital voice recorder.
  • A netbook and broadband connection for filing stories when I’m on the road or at the scene of a breaking news story.
  • This is what I carry around with me most of the time. If I know in advance that I’m going to be covering a story where I’ll be shooting video for online, I’ll also take my camcorder with its external microphone and tripod.

    I admit I’m obsessive about carrying around my man bag, even when I’m not on the clock. You just never know when you’ll need need this stuff. What if I’m driving around and see a police chase or something? It would suck if I didn’t have all my gadgets with me.

    I was able to take this video one day when I was walking to Starbucks downtown and saw two construction workers dismantling an old sign outside an abandoned store. I had walked under that sign a million times and so I thought there might be a story about this really old building being torn down to make way for something new. Since I had my camera on me, I shot some video, and since I had my notebook and recorder, I interviewed people and found out a new hotel was going to be built at the site. I had discovered a decent story about the changing character of Houston Street, from retail to tourism.

    If I hadn’t had my camera on me, I would have missed the chance to take some interesting video. There was no time to run back to the office. And being able to interview people right there at the scene helped me figure out there was an interesting story happening. So the man bag filled with gadgets saved the day. And I didn’t even need an iPhone.

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    Daily Diversion: Urban cattle drive

    January 31st, 2010

    When you work a weekend shift at a newspaper, you never know what kind of story you’re going to cover. Some are kind of lame, but I liked this annual cattle drive on Houston Street in downtown San Antonio. I covered this event a few years ago and Abe Levy wrote the most recent story about the cattle drive, which kicks off the San Antonio Stock Show & Rodeo. I took this video of it last year when Jen and I were downtown on my day off. Good times.

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    Retaining wall not built to engineering specifications

    January 30th, 2010

    Retaining wall at the Hills of Rivermist

    Jen and I wrote a follow-up story today about the sinking neighborhood in San Antonio called the Hills of Rivermist:

    The retaining wall that collapsed last week and jeopardized a neighborhood built by Centex Homes was built with less mortar than what engineering plans called for, according to city officials who inspected the wall Friday.

    “Staff determined that the retaining wall was not built in accordance with the design provided by (the) design engineer,” Assistant City Manager T.C. Broadnax wrote in an e-mail to his boss, Sheryl Sculley, Mayor Julián Castro and the City Council.

    “For example, the building plans for the wall show limestone mortared throughout the wall. Based on field observations of the failed portion of the wall, mortar was not installed according to the building plans.”

    There are many different types of retaining walls. The one at Rivermist is called a gravity wall, which relies on a heavy mass of mortar and stones to remain stable. So if a contractor skimps on the mortar in the core of the wall, the wall becomes lighter and it can become unstable.

    Here’s the city e-mail describing the lack of mortar inside the wall. The city also set up a new Web page that provides updates about Rivermist. Residents can also report concerns about retaining walls near their homes.

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    Daily Diversion: How to report the news

    January 29th, 2010

    Brilliant.

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    Maps, plats, and photos of the sinking neighborhood in San Antonio

    January 27th, 2010

    I’m helping out with the coverage of the “slope failure” at the Hills of Rivermist, the neighborhood in San Antonio where shifting soil and a buckled retaining wall jeopardized homes. Here are some useful resources to learn more about what happened:

  • Express-News photographer Jerry Lara shot recent aerial photos of the neighborhood showing the scale of the damage.
  • Bing features a cool 3D map of the site, and in Google Earth you can view a series of aerial photos to see how the hillside was flattened and sculpted over time.

    Google’s tutorial explains how to check historical imagery of an area. The wall collapsed where Treewell Glen curves into Valley Well:


    View Larger Map

    Typing in an address of one of the affected homes, such as 12003 Treewell Glen, will zoom Google Earth to the spot. Then click on the clock symbol in the toolbar, and you’ll be able to view aerials dating back to 1995.

  • This is a plat of the site filed at the Bexar County courthouse. It identifies the engineering firm that designed the neighborhood as Pape-Dawson Engineers, a well-known firm in San Antonio. Gene Dawson told me the engineering work for the retaining wall was done by another firm. The plat also shows there’s a sewer line under the area that collapsed:

    The Hills at Rivermist Plat

    Centex says it still doesn’t know what caused the slope failure.

    You can search for and view plats, deeds, and other documents filed at the Bexar County courthouse for free at a Web page set up by County Clerk Gerry Rickhoff. The site requires you to register.

  • City Manager Sheryl Sculley sent this e-mail chain to Mayor Julian Castro and the City Council explaining the city’s permitting process. Centex Homes says it was unaware a permit was required for a retaining wall.
  • Centex released a public statement about the slope failure. “Centex has been focusing on stabilizing the homes and is now entering the investigation phase. We have retained several well-respected engineering firms and soils professionals to aid in our efforts to accurately determine the cause of the soil movement. We will not speculate on the underlying cause of the soil movement at this time, but will provide additional details when they become available.”
  • On Twitter, the incident has its own hashtag: #slopefail, coined by police reporter Eva Ruth Moravec who was among the first reporters at the scene on Sunday. Props do have to be given to KSAT for their own hashtag — Eva said they came up with #sinkholegate.
  • You can check the credentials for engineers in Texas at the Web page of the Texas Board of Professional Engineers. You can verify an engineer is licensed by searching here, or if you’re a data monkey you can download zip files of the entire roster of all engineers here. Disciplinary actions taken against engineers are listed here. You can browse the disciplinary actions, but they’re not easily searchable. You can search for a specific name by typing “http://www.tbpe.state.tx.us” in Google and then the name.
  • Feel free to get in touch with me with any tips or story ideas about #slopefail — here’s my contact page.

    Updated 1-29-10: Two more useful Web pages that are new:

  • Centex set up a Web page about the collapse. The company is posting announcements, a FAQ page, and a form that allows residents to pose questions online.
  • The San Antonio Express-News set up a Web page with all our news stories, photos, videos, and graphics about the sliding hillside.
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