Reader Jeff Machen had a question concerning how much training to give attendants on air monitoring equipment; especially when they may only be working a week long shut down? Here’s our reply from CSRT Manager Bryan Rogers.

When you’re dealing with temporary labor, it is difficult to ensure that they are well trained on something as complex as atmospheric monitoring. We checked with several equipment manufacturers, and they don’t set a specific amount of training required, but leave it up to the customer’s internal company policy and/or person(s) issuing the monitor.

We also spoke to a few of our instructors who work at different plants and refineries. The majority of these companies require a company employee to perform the initial monitoring and then again after a break in work greater than 30 minutes. In addition, they review with the attendant what to look for and what to do if there are changes in the readings or an alarm sounds. One company provides a four-hour PowerPoint presentation on monitoring and attendant responsibilities.

OSHA does not indicate a time frame for this training either. However, it does require that persons be capable of safely performing the tasks assigned. Therefore, I would say your best bet would be to cover as much of the manufacturer’s instructions as possible along with reviewing the most common problems such as…

    - Calibration conversions
    - Turning on the monitor (or “field zeroing”) in the presence of contaminates
    - Negative LEL or negative toxic readings
    - Contaminated sampling hoses
    - Clogged filters

Lastly, I would stress to the attendants the importance of contacting a supervisor if they have any questions or concerns - and, if they get any unusual results from the monitor… “Do not hesitate to have everyone exit the space while the results are investigated!”

"Most likely the loaded section of the line is catching on the anti-error catch where the load line enters the body of the ID. This is a safety feature of the ID to prevent free-falling loads if the ID is loaded backwards. To prevent the rope from jamming, consider positioning yourself between the ID and the load facing the anchor. Hold both sections of rope oriented towards the load. Pull on the left section of rope while allowing the right section to drag through your hand. This will keep the rope clear of the anti-error catch." ~Roco Chief Instructor Pat Furr.

The answer may be in the description “trusty old”. The ID has a wear indicator cast into the friction bobbin. It is located at the top of the bobbin on the side of the bobbin that the swinging side plate is on. When in usable condition the wear indicator is visible as a slightly raised ridge about a half-inch long. If the wear indicator is not visible the bobbin is worn out and the ID needs to be taken out of service.

 Smart answer courtesy of Pat Furr

Several of the current electro/mechanical CO sensors will give a false indication of CO when exposed to solvents and especially when exposed to isopropyl alcohol. If the potential for CO presence can be definitively ruled out, consider using an atmospheric monitor with no CO sensor.

Driving around your town, how many times have you seen workers in a trench working totally unprotected?  As an emergency responder, are you aware of the imminent dangers around these trenches and do you know how to protect yourself should you respond to one of these incidents?

Trenches can collapse without warning entrapping and surrounding a victim in seconds – making it impossible to breath. Most trench cave-ins occur in good weather, and it has been  reported that up to 70% of fatalities occur in trenches less than 12 ft deep and less than 6 ft wide. Failed trenches have a 100% chance of secondary collapse…it’s just a matter of time.

Just a few things to think about…

• 1 cubic yard of dirt moving 6 ft will reach an impact force equal to 45mph.
• 2-feet of soil on a person’s chest will create 700-1,000 lbs of pressure.
• 18-inches of soil covering a body exerts up to 1,800 to 3,000 lbs of pressure.

Here’s a recent fatality that occurred when workers were installing storm drains in Alamo, Texas.

OSHA has cited M&G Equipment Group Ltd., doing business as M Construction, with two alleged willful and six alleged serious violations following the death of an employee in March 2010 who was working in a trench installing a storm drainage system. “A company’s failure to protect its workers from cave-ins is simply unacceptable,” said Michael Rivera, OSHA’s area director in Corpus Christi, Texas. “If OSHA’s standards regarding proper trench sloping, shoring and shielding were followed, it is possible this tragedy could have been avoided.”

Serious citations were issued for failure to provide workers with safe egress when working in a trench, keep excavated soil a safe distance from a trench, use a properly designed trench shield, and ensure workers are trained on excavation hazards. A serious citation is issued when there is substantial probability that death or serious physical harm could result from a hazard about which the employer knew or should have known.

Proposed penalties total $53,550. OSHA standards mandate that all excavations 5 feet or deeper be protected against collapse. Detailed information on trenching and excavation hazards is available on OSHA’s Web site.