Late on the afternoon of Jan. 28, 2014, all the ever-changing variables in the workday of Jose Dario Suarez turned against him.

That day, his third on the jobsite, the 55-year-old ironworker stood in a boom-lift bucket, holding a cutting torch fueled through a hose. Near him stood another veteran ironworker, Terry Watson, who operated the controls. The boom lift sat on a small barge at a new pedestrian bridge being built over Brazos Lake, part of the Brazos River, on the Baylor University campus in Waco, Texas. Watson was preoccupied with getting the bucket in the right position near a recently placed beam. Suddenly, Suarez, Watson and the boom lift tumbled off the barge into frigid waters.

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Tied off to the basket as well as wearing a floatation vest, Watson managed to surface, purple-faced. In his haste, he first swam in the wrong direction—away from the barge and toward a bridge pillar—before swimming back to the barge. After 108 heart-stopping seconds in the water, the crew pulled him out.

Suarez, also tied off and wearing a vest, never surfaced. A forensic medical examiner’s report showed that he managed to undo one of his fall-arrest harness buckles before his lungs filled with water and he lost consciousness.

Two years later, the details on what should have happened to prevent Suarez’ drowning that afternoon arebefore a jury in Harris County state court in Houston。陪审团将决定苏亚雷斯（Suarez）家人的疏忽和损害赔偿的索赔 - 他的妻子拉奎尔（Raquel），他的三个孩子和他的母亲。他们起诉了大多数参与的公司。

苏亚雷斯（Suarez）的去世充满了尖锐的提醒，对建筑雇主，安全经理和工人的提醒是，由谨慎的总理承包商团队经营的项目可能发生的事情，并记录了良好的安全管理，并与经验丰富的钢铁分包商合作。Prior to the accident, the project team took pains on paper but missed numerous opportunities, involving the protective equipment, the barge placement, the boom lift and its operator’s experience, that could have prevented the accident, according to a review of legal pleadings, witness depositions and the federal investigation into the accident. Safety concerns expressed in writing before the accident were undermined by human oversight and lapses in the field, the documents show.

There are other important ideas involved. For years, ironworkers have chafed at 100% tie-off, fearing a greater hazard from being constricted in an unpredictable environment. What happened at the Baylor bridge that day, when both Suarez and Watson were tied off, amplifies that concern and evokes another: that safety isn’t a binary matter of being tied off or not, safe or unsafe. At any moment on any project, all workers’ safety involves variables that comprise changing conditions and human nature.

When enough of the variables line up the wrong way, as they did on Jan. 28, 2014, someone can get hurt or die.

What triggers similar low-frequency, high-impact events is the focus of a current Construction Industry Institute study. John Gambatese, professor at Oregon State University and a member of the CII research team, says the study is developing a method to analyze precursor events. Some of the precursors at the Baylor jobsite—such as not taking 10 to 15 minutes to adjust the barge, vague safety procedures and employees who are new or unfamiliar with the working conditions—seem to match the kinds found in other high-impact events, he notes.

Safety Penalty: $5,000

The U.S. Occupational Safety and Health Administration long ago settled its only penalty in the accident—a $5,000 levy against Suarez’s direct employer, steel erector Derr & Isbell Construction LLC. OSHA said the company failed to provide a safe work environment at the jobsite.

在a redacted version of the OSHA investigator’s accident report, which ENR reviewed, there is much other material to help recreate what occurred. And in the Suarez family’s civil lawsuit, Texas court docket No. 2014-11694, attorneys have amassed a growing library of documents arguing over matters such as whether maritime law should apply, the scope of materials each side must produce for evidence and the experts each side should be allowed to call at the jury trial. It provides a clearer picture of all that came into play in Jose Dario Suarez’ drowning.

在filing the lawsuit for the Suarez family, Houston-based attorney Vuk Vujasinovic targeted any entity that had anything to do with the matter, including the prime contractor, Irving, Texas-based Austin Bridge & Road. The firm is understood to have a teaming agreement with Tulsa-based Flintco LLC. In their defense, Austin Bridge and Flintco have argued that the accident is covered by workers’ compensation insurance and that survivors aren’t entitled to further damages.

Several aspects of what happened aren’t disputed. According to OSHA’s investigation report, Derr & Isbell had assembled a crew of eight at the pedestrian bridge, but none had ever worked over water before. Watson and Suarez had been on the jobsite just three days.

由于Derr＆Isbell船员主管David Nelson转身离开了，除了Watson进入水中之前，没有其他人目睹了繁荣的升降机。当他听到刮擦的声音并回头时，尼尔森看到了电梯配重，但是电梯已经在水中。尼尔森作证说，他受过训练，不要潜水来进行营救。

At the heart of the matter, expert testimony will claim that Watson, Suarez’s co-worker in the boom-lift basket, accidentally drove it off the modular barge—a claim supported by a police report.

Watson has been extensively interviewed for pre-trial depositions. He clearly stated that, at the time of the accident, he had never previously worked on a barge or over water and that he had failed to read the boom-lift operating manual. He also was clear that Suarez himself had chocked the tires of the boom lift before getting into the basket with Watson and that the front tires were about 4 ft from the edge of the barge.

Also, Watson was clear that his decision not to reposition the barge to avoid putting the boom lift at the edge was not due to rushing, but because they were in the middle of a task. “I wanted to just move … the lift and get it right.” Repositioning and re-spudding the barge would have taken 10 to 15 minutes.

Moments Before Construction Accident

But parts of Watson’s account lack the incontestable clarity of some of his other statements. Part of a 4-hour-plus session held on Oct. 7, 2014, at an attorney’s Dallas office, his most interesting statements have to do with the moments before the accident when the boom lift is near the edge of the barge.

在沃森（Watson）的帐户中，当他和苏亚雷斯（Suarez）都在水桶中时，苏亚雷斯（Suarez）开始拉动剪裁软管，准备在桥梁区削减支架。沃森确认了他告诉OSHA调查人员的内容，吊臂升降机控制面板上有三个旋钮：一个用于驾驶的旋钮，一个是驾驶或调整篮子位置的中心，另一个用于抬高或降低繁荣。沃森说，事故发生之前，他的右手处于“范围范围内的控制”上。那部分很明显。

Vujasinovic asked, “So, you tell us this middle knob, you were pulling it towards your—like towards you in the picture?”

“Yes, sir. That was my right hand.”

沃森说，与此同时，他将自己的“左手放在繁荣和摇摆控制上”。

Vujasinovic asked, “When it went into the water, your hands were touching those controls, right?”

沃森去了djust the position of the boom and bucket at the bridge section, “scoping out” the exact position needed, “we were over the water as soon as we swung,” he said. When “scoping out, it’s a smooth scope-out, nothing moving. And then, all of a sudden, everything went to moving,” and “the next thing I knew, we’re in the water,” the ironworker added.

Vujasinovic几乎戏剧性的强度被问及沃森为什么不要求驳船和拖船人员重新放置驳船，沃森说，当时，他要求他们将其移动以进行先前的任务。但是对于事故发生时所需的工作和职位，“我并没有发生。我不认为我需要它，”他说。

Missed Risk Management Opportunities

Whether or not Watson accidentally drove the equipment off the barge, missed opportunities stand out that could have prevented the accident. These include the failure to follow recommendations by the maker of the boom lift to secure the machine to the barge with chains. In another deposition, Derr & Isbell supervisor Nelson stated that he had tested the boom-lift chains for their future use on the barges. However, both Nelson and Watson stated that, at the time of the accident, the boom lift was unchained.

OSHA’s investigation also concluded that Derr & Isbell “unchained the Genie Lifts to reposition the lifts on the barges and did not re-chain/secure the lifts to the barge.”

Another missed opportunity involved the fall protection harnesses and tie-offs. While Austin Bridge & Road’s safety policy for working over water on a boom lift on a barge required employees to “wear [a] life vest or buoyant work vest in lieu of conventional fall protection due to the possible drowning hazard,” Flintco’s policy apparently was 100% tie-off, and that’s what was followed. Anthony Garcia, project safety manager for Austin Bridge & Road, stated in a deposition that Flintco’s Steve Jordan, whom documents identify as a safety manager, directed him to enforce 100% tie-off for work on the barges. “His opinion was 100% tie-off on an aerial lift,” Garcia testified. Derr & Isbell’s policy called for both tie-off and buoyant vests—for a good reason, according to Nelson.

When asked by Vujasinovic, the Suarez family attorney, whether he thought a life jacket would have helped Suarez when the victim was tied to a boom lift that sank to the bottom of Lake Brazos, Nelson replied that the tie-off was needed “because there’s other places you can fall besides the river—there’s concrete, there’s steel, there’s the barge. So, we had to enforce our tie-off policy.”

Of course, that also meant a fall into the water could be deadly because the boom lift would go to the bottom and so would the ironworkers.

法庭记录显示Flintco没有直接回复的s Jordan. However, in the summer before the accident, when the bridge work was getting started, Jordan sent an email to Austin Bridge & Road’s Garcia, stating his concern about what he had seen of the bridge-work safety plan so far. The work was “high on [Austin-Flintco’s] and Baylor’s radar,” said Jordan.

The high-profile and easily viewed jobsite added to Jordan’s concern. The bridge work “will be viewed directly from the school” and “is on [a jobsite] camera 100% of the time,” noted Jordan. The existing plan “seems to be a policy with vague procedures mixed in,” he wrote. “We need to be comfortable with this work, especially the ones doing it.”

Five months later, his concerns proved to be well founded.

with Scott Van Voorhis