Download Water Operator Certification Exam Q&A: New Mexico Regulations and more Exams Water and Wastewater Engineering in PDF only on Docsity!
Water Operator Certification Study Material
(New Mexico) (Basic)|Comprehensive Q&A
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Public water system is a system that serves a population of ___ or more regularly - correct-answer- 25 Maximum total chlorine residual ___ mg/l - correct-answer- 4 What type of contaminant is Iron - correct-answer-Secondary Primary contaminant is sometimes added to water supplies to prevent tooth decay - correct-answer-Fluoride The Failure of a public water system to comply with the NM Drinking Water Regulations must be reported to NMED within ___ hours - correct-answer- 48
MCL for Total Trihalomethanes ___ mg/l - correct-answer-0. SDWA sampling results must be reported to - correct-answer-New Mexico Enviroment Department (NMED) Ground water systems must sample for inorganic chemicals every ___ years - correct-answer- 3 The SDWA Compliance Cycle for Standardized Monitoring Rule consists of ___ Compliance Periods - correct-answer- 3 ___ or less than 5% bacteriological samples must be taken every month before a system is allowed to have TWO positive samples without violating the drinking water standard? - correct-answer- 40 Action level for Lead ___ mg/l - correct-answer-0. Maximum Contaminent Level - correct-answer-MCL
Flash mixers detention time be ___ minutes or 5 to 7 feet per second - correct- answer- 1 - 3 Low voltage current through the water in a storage tank which concentrates corrosion on the sacrificial anode - correct-answer-Cathodic protection Main operating unit in a centrifugal pump - correct-answer-Impeller An attachment to the well casing to provide a sanitary seal between the well casing and the effluent line - correct-answer-Pitless adapter Height a centrifugal pump can theoretically push water ___ feet - correct-answer-
Scale forming substance in water - correct-answer-Calcium carbonate Nuetral pH - correct-answer- 7
Minimum velocity to flush distribution system. ___ fps - correct-answer-2. Regulation minimum design pressure in distribution system. ___ psi - correct- answer- 30 Physical link between a potable water system and one of unknown quality - correct-answer-Cross connection DPD test is for - correct-answer-Chlorine analysis Protects against backsiphonage and backflow - correct-answer-Reduced pressure zone assembly Should be representative of the system - correct-answer-Bacti samples Hours to analyze bacti samples. - correct-answer- 30
Gate valve primary usage in a distribution system - correct-answer-Isolation Has a secondary MCL - correct-answer-Manganese Action level for copper. ___ mg/l - correct-answer-1. Any person responsible for the operation of all or any portion of a water supply system or wastewater facility - correct-answer-Operator Makes sure public waters systems treat the water to meet water quality standards, designed to protect the public from unnecessary health risks. - correct- answer-Safe Drinking Water Act (SDWA) New Mexico Water Conservation Fee - correct-answer-3 cents per 1000 gallons Used to fund sample collection and testing for inorganic, organic, and radiological contaminants in accordance with the 1986 SDWA - correct-answer-New Mexico Water Conservation Fee
Compliance sampling will either occur at - correct-answer-Point of entry or point of use Taken from customers taps after plumbing has been flushed with fresh water from the distribution system - correct-answer-Microbiological samples Disinfection by-products samples are taken from? - correct-answer-Distribution system Lead and copper samples are taken from? - correct-answer-Point of use sites draw directly from customers plumbing fixtures Lead and copper samples are taken after water has not been in use for ___ hours - correct-answer- 6 - 8 Why must Drinking water distribution system sampling plans be developed - correct-answer-Make sure samples are taken from the appropriate locations within the system
Found in the intestinal tract of warm blooded animals and humans - correct- answer-Coliform bacteria These bottles are clear plastic disposable container that are supplied by the manufacturer with the colilert testing kits - correct-answer-IDEXX If coliform bacteria are present in the water supply ___ may be present - correct- answer-Pathogens These bottles have a hinged cap that has a snap on type seal and a hinged latch to secure it also come with a plastic key - correct-answer-Snap Lid bottle Never use a kitchen sink faucet that swivels or and outdoor faucet that drips when selecting a __ - correct-answer-Sampling point You should flush the line ___ minutes or until the temperature changes before taking a sample - correct-answer- 3 - 5 How many mL for a chlorine sample - correct-answer- 5
how many mL for a pH sample - correct-answer- 10 Hold the bottle at a ___ degree angle while filling it - correct-answer- 45 Samples must be refrigerated at ___ degrees Fahrenheit - correct-answer- 39 When would you collect microbiological samples for reasons other than monitoring compliance - correct-answer-New & repaired water lines or wells that have been disinfected When collecting microbiological samples for reasons other than monitoring compliance such as new water lines You would check ___ on the form - correct- answer-Special sample It is important to take compliance sample at the beginning of the week incase - correct-answer-Repeat samples are needed
A good application for a peristaltic pump - correct-answer-Chemical feed pump Component in a diaphragm pump causes the most maintenance problems - correct-answer-Check valves Can be used as an initial check of coupling alignment - correct-answer-Straight edge The distance from the well to the edge of the cone of depression - correct- answer-Radius of influence If the drawdown increases - correct-answer-Screen is becoming clogged Type of algae will cause problems by clogging the filter bed - correct-answer- Diatoms Chemical used to kill algae in a lake - correct-answer-Copper sulphate
Ladders must extend at least ___ feet above the trench? - correct-answer- 3 Chlorine is ___ times heavier than water - correct-answer-1. Gate valves have ___ turns per inch - correct-answer- 3 Average detention time for flocculation process in minutes - correct-answer- 30 - 60 Detention time in rapid mix process in minutes - correct-answer- 1 - 3 Trunk line in a large municipal should have a isolation valve every ___ feet - correct-answer- 300 - 600 If a excavation is over ___ feet deep shoring may be needed if there isn't enough space to adequately slope a trench. - correct-answer- 5
Microorganisms whose presence in water indicates probable presence of pathogens. - correct-answer-Indicator organism White powder used to neutralize chlorine - correct-answer-Sodium Thiosulphate To insure the water being sampled is from the main and not the customers plumbling - correct-answer-Flush line Number is used to determine how many Bac-t samples must be taken - correct- answer-People served Minimum number of Bac-T samples required each month? - correct-answer- 1 Anytime the MCL is exceeded and fecal coliform positive results come back from any of the samples - correct-answer-Non-acute violation If retakes are required this month what is the minimum number of samples required next month - correct-answer- 5
Bacteria that are found only in surface water supplies - correct-answer- Cryptosporidium & Giardia How soon must NMED be notified that a Bacterial MCL has been exceeded? ___ hours - correct-answer- 24 Coliform group - correct-answer-Indicator organism Waterborne pathogens found in all water supplies - correct-answer-Typhoid, Cholera, Dysentery, Hepatitis, Paratyphoid (types A & B) Disease causing Bacteria - correct-answer-Pathogens Water - correct-answer-Universal solvent Ground & Surface - correct-answer-Two sources of water
Cause problems with liver, kidney, central nervous systems, may increase cancer risk and have possible reprouductive health risks - correct-answer- Trihalomethanes Used to locate Chlorine leaks - correct-answer-Ammonia Disinfectants used to treat drinking water. Most commonly formed when ammonia is added to chlorine to treat drinking water. The typical purpose is to provide longer-lasting water treatment as the water moves through pipes to consumers. This type of disinfection is known as secondary disinfection. - correct- answer-Chloramines Found in bleach - correct-answer-Sodium Hypochlorite Results in a free chlorine residual - correct-answer-Breakpoint chlorination Formed when Chlorine reacts with water - correct-answer-Hypochlorus acid & Hydrochloric acid
Additional piece of equipment needed to feed liquefied chlorine gas from a ton cylinder - correct-answer-Evaporator To keep Chlorine cylinders from rupturing from gas expanding. Chlorine rooms be kept below ___ F degrees - correct-answer- 120 Keep the chlorine gas forming Chlorine Hydrate also know as "GREEN ICE". Chlorine room be kept above ___ F degrees? - correct-answer- 60 Prevent Chlorine cylinders from rupturing when gets too hot - correct-answer- Fusible Plugs At what temperature does the designed fusible plugs melt? ___ F - correct- answer- 157 Why is Fluoride added to drinking water? - correct-answer-Prevent tooth decay Chemicals used as sources of fluoride - correct-answer-Sodium silicofluoride and hydrofluorosilic acid
