OHST case studies

OHST · Put your knowledge to work in context.

The Occupational Hygiene and Safety Technician (OHST) is a Board of Certified Safety Professionals (BCSP) credential for safety practitioners who handle industrial hygiene and occupational safety work at the technician or managerial level, or as consultants. Typical duties include conducting industrial hygiene sampling or overseeing that work, plus safety responsibilities such as calculating performance metrics, assessing risk, and influencing safety-related behavior. The OHST case studies are 5 cases and about 6,288 words.

The Zero-Incident Bonus and a Collapsing Reporting Culture

Ridgeline Components (420 employees, two plants) cut its total recordable case rate from 6.1 to 3.4 over three years. Over the same period, first-aid-only visits logged by the plant nurse fell 71%, and near-miss cards dropped from 38 per month to 6.

1,168 words, about 6 min 2

Solvent Exposure on a Four-Day Extended Shift

A coatings plant runs a 10-hour, 4-day schedule. You sample one painter over a full shift and calculate toluene segment concentrations: 2.0 h at 30 ppm, 6.0 h at 70 ppm, and 2.0 h of gun cleaning and miscellaneous work averaging 40 ppm, which includes a 25-minute period at 140 ppm.

1,100 words, about 6 min 3

Jam Clearing at the Case Packer: Guard, Tool, or Interlock

At a beverage plant the case-packer infeed conveyor jams 6 to 10 times per shift. Operators clear jams by reaching through a 14-inch gap under a fixed guard while the conveyor is running, using a 3-foot rod.

1,234 words, about 6 min 4

Whole-Campus Emergency Planning with a Muster Point in the Wrong Place

A campus has a 2-story office (120 occupants, voice evacuation system) and a 60,000 square foot warehouse (40 employees, 12 LP forklifts, pallets stacked 18 feet, and nineteen 100-lb propane cylinders stored against the east wall) plus a maintenance shop with 6 people. The warehouse alarm is manual pull stations with local bells only.

1,340 words, about 7 min 5

Nickel Spill to the Sewer, a Generator Status Surprise, and a Dilution Proposal

A 60-employee metal finisher discharges alkaline cleaning and nickel plating rinse water to the municipal POTW under a permit with a nickel limit of 2.6 mg/L daily maximum and 1.9 mg/L monthly average, monitored by flow-proportioned composite sampling. On 3 May an operator noticed a 40-gallon nickel plating bath spill running into a floor drain; the drain discharges to the sanitary sewer.

1,446 words, about 7 min