Water Treatment Grade 4 exam prep

Water Treatment Grade 4 exam prep which disinfectant would work best against Cryptosporidium Ozone The pH of a Water sample Is greater than the PHs so the Langlier index indicates the water is scale forming When water high in calcium bicarbonate is softened by ion exchange Sodium Bicarbonate remains in the product water A bypass valve would be used with a 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 1-2 inches which type of pipe joint is available in both bolted and bolt less flexible pipe joint designs Ball and Socket Joint which type of pipe joint permits flexible pipe alignment is inexpensive to manufacture and is easy to assemble push on joint new polyvinyl chloride pipe has a c-value of about 150+ which type of valve would be particularly useful for throttling the flow of corrosive liquids pinch valve Water meter pits are usually used in cold climates fuel oil will permeate which type of pipe 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? 39.6 hr 00:0101:28 in describing pump operation what type of curve shows the relationship between power and capacity P-Q curve What is Head Loss energy used by water when moving from point to point Static Suction Lift Difference in water placement What is Power 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 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. 4 log where are the sampling points located for required samplings of organics (except THMs) in a community water system entry points to the distribution system where are the sampling points located for required sampling of natural radionuclides in a community water system each entry point to the system continuous chlorine residual monitoring is required where the water enters the distribution system under the SWTR when the 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 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 2.0 mg/L the Surface water treatment rule does not specify which of the following treatment technology chloramine disinfection a regulated organic contaminant concentration that exceeds the MCL 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 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 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) .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 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 Alkalinity levels the filter backwash recycle rule applies to what sizes of systems all sizes which rule most directly guards against the presence of escherichia coli in the water supply total coliform rule which type of sample should always be collected for determining the presence of coliform bacteria grab sample what chemical element is used to remove chlorine from water NA2S2O3 water that is to be analyzed for inorganic metals should be codified with concentrated nitric acid a typical coliform colony in the membrane filter method has the following characteristics pink to dark red with a green metallic sheen which of the following is the first level of dissolved solids that is considered unfit for human consumption 4000 mg/L which type of special photometer is used to analyze for heavy metals in water Atomic Absorption Spectrophotometer in the multi tube fermentation method which type of culture media is used in the confirmed test green lactose bite broth all positive samples in the presence absence test must be confirmed using Brilliant Green Bile tubes what is PHs? pH saturation ______ is a measure of the hydrogen ion concentration presence in water pH what steps are involved in the MTF method Presumed, Confirmed, Completed tests Conductivity is a measure of the ability of an aqueous solution to do what carry current Describe the characteristics of carbon dioxide Colorless odorless and naturally occurring in all water in regard to the testing of coagulant effectiveness which method is the most readily available to most operators and has been commonly used for years Jar test which of the following does the saturation point of calcium carbonate primarily depend upon PH which of the following will increase pH, Hardness, and Alkalinity? Lime which chemical used for stabilization of potable water is a bacterial nutrient? polyphosphate wastewater water quality discharge requirements could be exceeded if which of the following chemicals are used for corrosion control in the water system Hexametaphosphate Lime is commonly used for corrosion control becaus