Safety math: rates, dose, slopes and TWA
ASP written lesson, 11 min read. ASP Domain 1: Mathematical Calculations
AI-drafted from the cited rules and fact-checked against them. Study aid, not site-specific safety advice. The official rule controls.
What you'll learn
- Compute a total and a serious-case incidence rate using the 200,000-hour base
- Calculate a noise dose from several periods, then convert it to a TWA
- Find the run and top width of a simple-slope excavation 20 feet or less deep
- Compute the 8-hour cumulative exposure to an air contaminant
- Match each exam question to the correct formula and unit
What this lesson covers
Learn to set up and solve the calculations the exam returns to again and again: incidence rates, noise dose and TWA, simple-slope excavation width, and shift-average air contaminant exposure. Choosing the right formula and unit protects your score and your records.
This lesson is included with a pass
Written lessons come with every ASP pass, along with the video lessons, the question bank, mocks and the tutor. $80 per exam or $143 for all three, for 180 days.
Try the free safety math: incident rates, noise dose, slopes, lifting practice questions
Visualize this
- Add hours at different levels and watch the dose pass the action level and the PEL.
- Pick the soil and the depth and watch the maximum allowable slope redraw.
An interactive diagram, included with every ASP pass.