Environmental Factors: Performance of essential functions may require exposure to adverse environmental conditions, such as dirt, dust, pollen, odors, wetness, humidity, rain, temperature and noise extremes, unsafe structures, heights, confined spaces, vibrations, animal/wildlife attacks, animal/human bites, water hazards, or rude/irate customers. Math: Requires the ability to perform basic mathematical calculations; ability to calculate decimals and percentages; may include ability to perform mathematical operations with fractions; may include ability to compute discount, interest, and ratios; may include ability to calculate surface areas, volumes, weights, and measures.