Level 1 water distribution practice test with accurate solution

Level 1 water distribution practice test with accurate solution The minimum and maximum chloride residual in a water distribution system is ? - 0.2 mg/l and 4mg/L of free chlorine Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant ? - 10 mg/L The minimum number of total coliform samples that must be collected per month is based on Wich of the following ? - The population served by the system When a distribution bacteriological sample is positive for a total coliform the procedure is ? - 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? - 6 hours What is hydraulic grade line ? - 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? - Every year Water pipelines are generally designed to carry water at a velocity below ? - 2.5b FPS. Feet per second Energy use in water systems is defined best by ? - 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 ? - 6 feet Which of the following should be in an organization plan ? - 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 ? - 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 - Plan and profile drawings Which are the components of directing staff ? - Motivating & communicating The accuracy of large meters should fall within what range ? - 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 ? - 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 ? - 20% (80% effienciency) What is a major cause of underground construction deaths ? - Lack of shoring or shoring failure If the tds is marginally too high for the pump the likely result will be ? - Decrease in flow rate Air release valves are installed at what location in a water line ? - At high points of a pipe line The maximum pressure at service connections should be less than ? - 100 psi In selecting and Evaluating a tank, storage capacity must be matched _______of the system ? - Peak demand A hydraulic grade line will always slope in what direction ? - Slope downward in the direction of the water flow Where does the majority of microbial growth with in a water distribution system occur ? - 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 ? - They must be at least 12 hours apart When backfilling a pipe line how deep should the first layer of backfill be compacted - At the horizontal centerline of the pipe What is an important step in problem solving - Realization that a problem still exist What type of pipe joint is a considered inflexible and therefore is not usually installed below ground ? - Flanged joint buttefly valves are used in distribution systems ? - Generally when the pipeline is greater than 16''. When someone throttling might be replaced .