Class C Water Questions & Answers Correct!!

How many years of experience must an operator have to be a grade D Operator - ANSWERS12 months of operating and maintenance experience in a distribution system serving 1000 people or more AnswerDisinfection means - ANSWERSinactivation of pathogenic organisms in the water Answerpotable water is - ANSWERSwater which meets the requirements established by Subpart 5-1 of the New York State Sanitary code AnswerWhat is an MCL? - ANSWERSMaximum Contaminant Level AnswerWhat is the minimum residual allowed at any "representative" point in the distribution system? - ANSWERS0.2 ppm AnswerWater weighs - ANSWERS8.34 lbs per gallon AnswerA rise of 2.31 feet in water level increases pressure by - ANSWERS1 psi Answernew water mains ____ before activation can occur - ANSWERSmust be flushed, pressure tested, disinfected and a negative bacteriological test result received AnswerThe movement of pipe during surges and water hammer can be prevented with the use of - ANSWERSthrust blocks restraint joint pipe restraint glands Answerhydrostatic testing is done at - ANSWERS1.5 times working pressure AnswerAccording to Subpart 5-1 of the New York State Sanitary Code, a minimum of ___ psi is required at all points in the distributions system under all conditions - ANSWERS20 AnswerOne cubic foot of water equals ___ gallons of water - ANSWERS7.48 Answerthe packing around a pump shaft - ANSWERSshould leak a little water to keep the packings and shaft cool Answeratmospheric pressure is equal to - ANSWERS14.7 at sea level Answermonthly operations reports should be filed with the local health department - ANSWERSby the 10th of the following month Answerthe plan that identifies and outlines the steps necessary to ensure that potable water is available during all phases of a water supply emergency is - ANSWERSa water supply emergency plan AnswerA grade C operator can - ANSWERSoperate a water treatment plant designed to treat 2.5 mgd or less operate a water treatment plant designed to serve 1000 people or less operate, maintain, monitor and make repairs to a distribution system serving 1000 people or less Answerwhat is the minimum residual allowed at any "representative" point in the distribution system? - ANSWERS0.2 ppm Answerhard water is the result of - ANSWERScalcium and magnesium in the water Answerthe packing around a pump shaft - ANSWERSshould weep a little water to keep the packings and shaft cool Answera cross connection - ANSWERSis a connection between a potable water supply and non-potable water supply Answertrenching and shoring requirements are regulated through - ANSWERSOSHA/PESH Answerthe static water pressure is directly related to - ANSWERSthe water level in the tank Answeran air gap - ANSWERSis a form of cross connection control Answerhighly chlorinated water used in the disinfection process - ANSWERSmust be safely reduced to an environmentally acceptable level Answera double check valve assembly is - ANSWERSan approved backflow prevention device sold as an assembled unit Answertrenches can be determined safe by a - ANSWERSCertified Competent Person Answerthe hydrologic cycle is - ANSWERSthe continuous movement of water to the atmosphere and back again Answerbacteriological samples should be - ANSWERStaken from a site representative of water in the distribution system Answerbefore digging, the operator should call - ANSWERS"Dig Safe" AnswerPVC Pipe material or water mains in good to use - ANSWERSin corrosive soils Answerwater storage tanks - ANSWERSmaintain water pressures during peak demand periods should provide adequate storage for domestic, industrial and fire protection needs should have adequate turn over to avoid loss of chlorine residual in the water AnswerWhat is the chlorine dose if 40 gallons of a one-percent sodium hypochlorite solution were used to treat 200,000 gallons of water - ANSWERS1.99 AnswerThe multiple tube fermentation, membrane filter, colilert and colisure method are all testing procedures used for _______ - ANSWERSMicrobiological Contamination AnswerAn enclosed rectangular water tank needs to be painted. The tank measures 10' long, 10' wide and 5' deep. what is the combined interior surface area of the storage tank? - ANSWERS400 ft2 AnswerHomes A and B are identically built. water from both homes is provided by the same service line. the water pressure, at ground level, in Home A is 50 psi and in Home B is 60 psi. what is the elevation difference between the two homes? - ANSWERS23.1 ft AnswerA basin is 10' wide, 10' long, and 5' deep. what is the volume of the basin in cubic feet? - ANSWERS500 ft3 Answera new water main needs to be disinfected at a dose of 50 ppm. the main has been flushed and is assumed to have little or no demand. the main has a diameter of 12 inches and is 250 feet long. how much chlorine is needed? - ANSWERS0.61 lbs Answerhow many gallons of water can an 8" pipe that is 25' long hold at full capacity? - ANSWERS65.275 gallons AnswerHow many pounds of chlorine must be added to achieve a 2 ppm residual in a 2 million gallon tank? - ANSWERS33.36 lbs