Ability to define problems, collect data, interpret an extensive variety of technical instructions in mathematical or diagram form and deal with several abstract and concrete variables, calculate figures, decimals, fractions, percentages, averages, conversions and solve for unknown values; must possess the ability to apply concepts of basic algebra and geometry such as linear, area and volume measurements; must be able to solve mathematical word problems and set up and solve difficult wastewater formulas. Ability to define problems, collect data, interpret an extensive variety of technical instructions in mathematical or diagram form and deal with several abstract and concrete variables, calculate figures, decimals, fractions, percentages, averages, conversions and solve for unknown values; must possess the ability to apply concepts of basic algebra and geometry such as linear, area and volume measurements; must be able to solve mathematical word problems and set up and solve difficult water treatment formulas.