Water Treatment Grade 4 exam prep question with complete solution 2023

Water Treatment Grade 4 exam prep question with complete solution 2023which disinfectant would work best against Cryptosporidium - correct answer Ozone The pH of a Water sample Is greater than the PHs so the Langlier index - correct answer indicates the water is scale forming When water high in calcium bicarbonate is softened by ion exchange - correct answer Sodium Bicarbonate remains in the product water A bypass valve would be used with a - correct answer gate valve Where ground frost is expected the riser pipes in a meter pit should be atleast how far away from any wall of the meter box to prevent freezing - correct answer 1-2 inches which type of pipe joint is available in both bolted and bolt less flexible pipe joint designs - correct answer Ball and Socket Joint which type of pipe joint permits flexible pipe alignment is inexpensive to manufacture and is easy to assemble - correct answer push on joint new polyvinyl chloride pipe has a c-value of about - correct answer 150+ which type of valve would be particularly useful for throttling the flow of corrosive liquids - correct answer pinch valve Water meter pits are usually used in - correct answer cold climates fuel oil will permeate which type of pipe - correct answer polyethylene pipe An ion exchange softener is treating a flow rate of 125 gpm. what is the operating time in hours if the softener unit treats gallons before it requires regeneration? - correct answer 39.6 hr in describing pump operation what type of curve shows the relationship between power and capacity - correct answer P-Q curve What is Head Loss - correct answer energy used by water when moving from point to point Static Suction Lift - correct answer Difference in water placement What is Power - correct answer Work done in a given time if a water system collects at least 40 samples per month for the analyses of total coliforms, what percentage of total coliform samples are acceptable for the system to remain in compliance with the maximum contaminant level for total coliforms - correct answer no more than 5% water systems are required to achieve at least________ removal and or inactivation of viruses between a point where the raw water is not subject to recontamination by surface water runoff and a point downstream before or at the first customer. - correct answer 4 log where are the sampling points located for required samplings of organics (except THMs) in a community water system - correct answer entry points to the distribution system where are the sampling points located for required sampling of natural radionuclides in a community water system - correct answer each entry point to the system continuous chlorine residual monitoring is required where the water enters the distribution system under the SWTR when the - correct answer population served is 3300 people. a community water system must post the consumer confidence report on a publicly accessible website if it serves more than - correct answer people public water systems that cannot meet the required removal of TOCs can comply if the source water TOC level is ________ calculated quarterly as a running annual average - correct answer 2.0 mg/L the Surface water treatment rule does not specify which of the following treatment technology - correct answer chloramine disinfection a regulated organic contaminant concentration that exceeds the MCL - correct answer is a teir 2 violation requiring public notification withing 30 days operators must balance satisfying regulations on the amount of certain chlorinated organic compounds with - correct answer meeting disinfection limits a water system using conventional filtration treatment does not have to use enhanced coagulation to achieve the total organic carbon percent removal if - correct answer the treated water quarterly running average TOC is less than 2.0 mg/L the stage 1 DBPR established an MCL of _____ for TTHM ( total THMs) - correct answer .08 mg/L the safe drinking water act defines a public water system as a supply of piped water for human consumption that has at least _______ service connections, or serves _______ or more persons 60 or more days each year - correct answer 15;25 under the enhanced coagulation requirement ls of the DBPR treatment plants must remove specific percentages of total organic carbon based on their source water total organic carbon and what other factor - correct answer Alkalinity levels the filter backwash recycle rule applies to what sizes of systems - correct answer all sizes which rule most directly guards against the presence of escherichia coli in the water supply - correct answer total coliform rule