A contractor has 25 employees working outdoors when the temperature reaches 87°F. The total amount of water that must be available on-site for an 8-hour shift is:
Correct Answer
C) 50 gallons
At temperatures above 80°F, Cal/OSHA requires 1 quart per worker per hour. For 25 workers × 8 hours × 1 quart = 200 quarts = 50 gallons minimum.
Why This Is the Correct Answer
Cal/OSHA Section 3395 requires at least 1 quart of fresh, cool water per employee per hour when temperatures exceed 80°F. Calculation: 25 employees × 8 hours × 1 quart = 200 quarts. Converting: 200 quarts ÷ 4 quarts/gallon = 50 gallons. The water must be fresh, pure, and suitably cool.
Why the Other Options Are Wrong
Option A: 100 gallons
100 gallons would require 400 quarts, equivalent to 2 quarts per person per hour — double the required amount. While extra water is never harmful, this is not the minimum required by the regulation.
Option B: 75 gallons
75 gallons equals 300 quarts. Dividing by 25 workers and 8 hours gives 1.5 quarts per person per hour — above the minimum but not the correct calculation based on the regulation's 1-quart standard.
Option D: 25 gallons
25 gallons equals 100 quarts. For 25 workers over 8 hours, that's only 0.5 quarts per person per hour — half the required minimum. This would leave workers dangerously under-hydrated in 87°F heat.
Memory Technique
Hot weather water formula: Workers × Hours × 1 quart, then divide by 4 for gallons. At 87°F: 25 × 8 × 1 = 200 quarts = 50 gallons. Memorize: '80°F triggers 1 quart per hour per person.'
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