Level 1 water distribution practice test Questions and Answers 2022/2023

The minimum and maximum chloride residual in a water distribution system is ? - ANSWER 0.2 mg/l and 4mg/L of free chlorine Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant ? - ANSWER 10 mg/L The minimum number of total coliform samples that must be collected per month is based on Wich of the following ? - ANSWER The population served by the system When a distribution bacteriological sample is positive for a total coliform the procedure is ? - ANSWER Repeat the sample and take a sample 5 connections upstream and downstream to confirm total coliform For lead and copper sample the water must be In the pipeline for at least? - ANSWER 6 hours What is hydraulic grade line ? - ANSWER A line to which the water level would rise in a small ,vertical tube,connected to the pipe How often should cathodic protection anodes in your system be inspected? - ANSWER Every year Water pipelines are generally designed to carry water at a velocity below ? - ANSWER 2.5b FPS. Feet per second Energy use in water systems is defined best by ? - ANSWER Energy use varies among systems and an energy inventory study would need to be conducted to determine relationships The minimum recommended separation distance between a water main and a storm sewer is ? - ANSWER 6 feet Which of the following should be in an organization plan ? - ANSWER Identifies clear lines ,defines the divisions of labor ,establishes unity of command If pipelines are not restrained using steel rods concrete thrust blocks can be used at ? - ANSWER Every bend and transition Engineering Drawings that show the depth of pipe, the pipe location both vertically and horizontally and the correct distance form a reference point are known as which of the following - ANSWER Plan and profile drawings Which are the components of directing staff ? - ANSWER Motivating & communicating The accuracy of large meters should fall within what range ? - ANSWER Not less than 97% not more than 103% In some older water system lead service line still exist. What would be the best practice when finding lead pipe ? - ANSWER Be replaced What is the acceptable range for water loss in a typical municipal distribution system that has a variety of pvc and di pipe ? - ANSWER 20% (80% effienciency) What is a major cause of underground construction deaths ? - ANSWER Lack of shoring or shoring failure If the tds is marginally too high for the pump the likely result will be ? - ANSWER Decrease in flow rate Air release valves are installed at what location in a water line ? - ANSWER At high points of a pipe line The maximum pressure at service connections should be less than ? - ANSWER 100 psi In selecting and Evaluating a tank, storage capacity must be matched _______of the system ? - ANSWER Peak demand A hydraulic grade line will always slope in what direction ? - ANSWER Slope downward in the direction of the water flow Where does the majority of microbial growth with in a water distribution system occur ? - ANSWER Dead end water lines Wells that are biologically contaminated from repeat coliform or fecal coliform must be bacteriologically surveyed and sample which is not correct ? - ANSWER They must be at least 12 hours apart When backfilling a pipe line how deep should the first layer of backfill be compacted - ANSWER At the horizontal centerline of the pipe What is an important step in problem solving - ANSWER Realization that a problem still exist