Class A Water Operator Exam Test 4..docx

Class A Water Operator Exam Test 4.
How many Training Hours and experience for a class D Water Operator - ANS >> 16 Hours Training
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and No Experience
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How many Training Hours and experience for a class C Water Operator - ANS >> 36 Hours Training and
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1 year Experience
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How many Training Hours and experience for a class B Water Operator - ANS >> 100 Hours Training
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and 3 years Experience (must include 1 year of hands on experience)
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How many Training Hours and experience for a class A Water Operator - ANS >> 200 Hours Training
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and 5 years Experience (must include 2 years of hands on experience)
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How many Training Hours and experience for a Class C Lab Operator - ANS >> 32 Hours and no
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experience
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How many Training Hours and experience for a Class B Lab Operator - ANS >> 32 hours of C and 32
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hours of B and 6 months experience. ***associate in science can substitute 32hrs of C level training
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How many Training Hours and experience for a Class A Lab Operator - ANS >> 32 hours of B and 1
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year experience. ***Must include a Bachelor in science
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How many Training Hours and experience for a Class C Distribution Operator - ANS >> 36hours and 1
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year experience
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How many Training Hours and experience for a Distribution Technician - ANS >> 8 hours and no
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training.
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Community Water System - ANS >> A public water supply that has at least 15 service connections or
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serves 25 or more persons on a regular basis
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Primary Contaminants - ANS >> Contaminants identifies by the EPA as harmful to umal health
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Maximum Containment Level (MCL) - ANS >> The level in which contaminants must not exceed or
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public notification is required.
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Cryptosporidium - ANS >> A microsocpic parasite that can be found in water. It produces cysts that
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are very resistant to harsh environmental conditions. It is responsible for intestinal illness called
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cryptosporidiosis. Symptoms include diarrhea, cramps, gas, bodily discomfort, fatigue, and weight loss.
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Occurs one week after exposure and can last for 1-4 weeks
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Disinfection Profiling - ANS >> A water system assesses the level of disinfection currently provided and
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then determines the impact a proposed change in disinfection practice would have.
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E. coli - ANS >> A bacterium that is commonly used as an indicator of human health risk from harmful
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micro organisms that can be present in water. Symptoms include sever cramps and diarrhea. Blood is
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often seen in the stool. Symptoms begin 1-9 days after exposure and last a week or less.
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Giardia - ANS >> A microscopic parasite that can be found in water. It produces cysts that are resistant
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to harsh environmental conditions. Giardia causes intestinal illness called giardiasis. Symptoms simular
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to cryptosporidiosis. Vomition, chills, headache and fever may also occur. Symptoms begin one week
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after exposure and can last up to a month.
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Hard Water - ANS >> A characteristic of water caused mainly by the salts of calcium (Ca++) and
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magnesium (Mg++). Undesirable due to formation of soap curds, increase use of soap, and scale
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deposits in boilers and water heaters. Defines as having hardness of 100mg/L or greater
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Maximum Residual Disinfectant Level (MDRLs) - ANS >> The highest level of disinfectant allowed in
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drinking water. Standards set by the US EPA
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Microbial Pathogens - ANS >> Micro-organisms that cause disease
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, Safe Drinking Water Act (SDWA) - ANS >> An Act passed by the US Congress in 1974. It establishes a
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Bcooperative program among local, state, and federal agencies to ensure safe drinking water for
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Bcustomers.
Ch 1 - One gallon of water weighs - ANS >> 8.34 pounds
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Ch 1- The average domestic water usage per person per day is usually somewhere in the range of -
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BANS >> 100-130 gallons
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Ch 1 -Probably the most important source of information to use when implementing changes in
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Bprocess control at a water plant is - ANS >> Lab Results
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Ch 1 - The most important duty of a water plant operator is to - ANS >> Help to protect the health
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Band well-being of the community
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Apparent color - ANS >> The color visible in water
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True color - ANS >> Dissolved material contribution to color and is not removed through simple
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Bfiltration (i.e. coffee or tea). Measure in Color Units (CUs) using a clear glass tube called a Nessler tub.
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Turbidity - ANS >> Particles suspended in water. These particles can be removed through filtration.
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BThis is considered a primary contaminant by the EPA. These particles can surround and protect
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Bharmful microorganisms from being destroyed by chlorination.
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Nephelometric Turbidity Unit (NTUs) - ANS >> A measure of turbidity B B B B B B B B B B


H+ - ANS >> hydrogen ion
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OH- - ANS >> hydroxide ion
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Carbonate Hardness (CH) - ANS >> Temporary hardness which is always alkalinity. Calcium and
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Bmagnesium ion combine with carbonate, bicarbonate, and hydroxide ions to form carbonate
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Bhardness. Carbonate Hardness precipitates out with heat.
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Noncarbonate Hardness (NCH) - ANS >> Permanent Hardness. Calcium and magnesium combine with
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Bsulfate and chloride ions the result is non-carbonate hardness. (Noncarbonate hardness = total
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Bhardness - total alkalinity) B B B


Alkalinity - ANS >> The ability to resist changes in pH in response to dilute acids or dilute bases. While
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BpH tends to be high with high alkalinity, it is not always the case. Alkalinity can be present in low pH
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Bconditions as well. B B


Chemical ions that form Alkalinity - ANS >> Hydroxide (OH-), carbonate (CO3--), and bicarbonate
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B(HCO-). The pH of water determines which of these three ions are present
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Total alkalinity (T-alk) - ANS >> The total amount of alkalinity present). Has a pH of between 4.5-14.0.
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BWater with pH less than 4.5 has zero alkalinity.
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Phenolphthalein Alkalinity (P-alk) - ANS >> A measurement of alkalinity. If pH is less than 8.3, no P-alk
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Bwill be present. Measures concentrations of hydroxide, carbonate, and bicarbonate in the sample.
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BPart of the total alkalinity.
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Colloids - ANS >> Suspended Solids that do not settle out in water
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Faculative organisms - ANS >> can live with or without oxygen
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Historically, the five major water-borne diseases have been - ANS >> typhoid, cholera, dysentery,
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Bpolio, and hepatitis (jaundice).
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Most common water borne disease - ANS >> Giardiasis
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Coliform bacteria - ANS >> non pathogenic bacteria often found in the intestinal tract of animals;
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Bmonitored as in "indicator" of fecal contamination of waterB B B B B B B B


Colilert test - ANS >> -a test to indicate contamination by coliform bacteria in drinking water.
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-qualitative test: test indicates presence or absence; not how much
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MPN (Most Probable Number) test - ANS >> a statistical determination of the number of coliforms per
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B100ml of water B B