In case you’ve been out of the country lately, Rivermist is the Northwest Side neighborhood where people saw huge cracks open in their backyards and a retaining wall collapsed Jan. 24.
Sweeney’s artwork is part of the Urban Landscapes exhibit on view at Palo Alto College Art Gallery through the end of the month.
Don’t worry, Centex. Sweeney has also made fun of President Bush. And he once created a postcard to Sam Houston from Davy Crockett on a fantasy vacation to Cancun: “Dude — This place is awesome .. met some chicks … Bowie puked in the lobby … Travis says hey.”
Posts Tagged ‘Sinking Neighborhood’
Nearly two months after a retaining wall split open at the Hills of Rivermist in San Antonio, Centex Homes submitted plans to the city for a new wall that is reinforced with concrete piers and will cost at least $4 million:
Centex Homes is hoping the third time’s the charm. This week it produced a preliminary design concept for a new retaining wall to replace one that collapsed in January in a Northwest Side neighborhood — which in 2007 replaced one that was not “performing to expectations.”
But homeowners say they are weary after two months of stress and uncertainty and are still on the fence about whether to trust that this latest fix will last.
The builder and developer of Rivermist and The Hills of Rivermist told the city it plans a wall 1,700 feet long. The new wall will be built in front of the existing retaining wall, and will include reinforced concrete piers driven 10 to 30 feet into the ground and reinforced concrete panels between the piers, Centex said in a news release.
The company will give the city formal engineering plans by April 30. It expects construction to take four to six months and cost $4 million to $5 million.
The original structure was a gravity wall, which relied on the heavy weight of stone and mortar to remain stable. But after the collapse, city officials inspected the wall and claimed it lacked a solid core of mortar, which makes the wall lighter — and unstable.
The day after a large retaining wall collapsed at The Hills of Rivermist in San Antonio, Centex Homes held a private meeting with residents. Outsiders, including city officials, weren’t invited.
We received a video of the entire meeting, which shows Centex claimed that the neighborhood was safe because city firefighters were leaving.
That was news to city officials:
“That’s a pretty bold statement for them to make,” Assistant City Manager Erik Walsh wrote colleagues at City Hall on Jan. 25 in an e-mail. Walsh pointed out that Centex was actually hiring off-duty technical rescue firefighters to stand by at the scene.
In addition to the video of the meeting, our story today offers links to city e-mails discussing the retaining wall collapse and Centex’s safety claims.
An interesting status report was posted online tonight by San Antonio officials who are examining the retaining wall collapse at the Hills of Rivermist. Officials met with local builders, who were told they must review all retaining walls built over the past three years that are more than four feet tall. The builders must make sure an engineer designed each wall and that the structure was built correctly. And the builders must pull permits for each wall by March 31.
The builders raised several concerns about the city’s permitting requirements, some of which were discussed in our story about the city’s lack of oversight of retaining walls. Here’s the complete status report on the city’s Web site:
Development Services, the Greater San Antonio Builders Association, and approximately fifty of its members met today to discuss the need for the public to feel assured retaining walls in San Antonio have been built correctly. At the meeting, Development Services discussed:
* The City’s building code requirements to obtain permits for retaining walls.
* Builders need to (1) identify all retaining walls over four feet and built during the past three years, (2) provide documentation the walls were designed by an engineer and built correctly, and (3) obtain permits for the walls by March 31st.
* Development Services will use the information to develop a tracking system for retaining walls.
At the meeting, the builders initially expressed that they did not believe all retaining walls require permits. In addition, since some of the walls were constructed several years ago, they were concerned about the challenges of finding documentation to satisfy the City’s permitting requirements. Finally, they expressed a need to amend the Unified Development Code to clarify permits are required during the site development stage of construction.
Development Services responded to the builders’ concerns by reiterating permits are required for retaining walls over four feet. The department will work in partnership with the builders to issue permits and to obtain documentation that attest to the safety of the walls by the end of the summer. Finally, Development Services agreed to explore an amendment to the Unified Development Code to reinforce the procedures for permitting retaining walls during all phases of construction; from land development to building development.
At the conclusion of the meeting, Development Services and the builders agreed it was important to restore the community’s confidence that existing retaining walls built in San Antonio are safe. Development Services will develop information bulletins and new applications to reinforce the procedures for permitting retaining walls related to new construction.
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:
“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.
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.
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:
Google’s tutorial explains how to check historical imagery of an area. The wall collapsed where Treewell Glen curves into Valley Well:
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.
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.
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: