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Water Operator Certification Study Material ( New
Mexico) (Basic)
1.Maximum Contaminent Level: MCL
2.Public water system is a system that serves a population of or more
regularly: 25
3.Maximum total chlorine residual_______________mg/l: 4
4.What type of contaminant is Iron: Secondary
5.Primary contaminant is sometimes added to water supplies to prevent tooth decay: Fluoride
6.The Failure of a public water system to comply with the NM Drinking Water Regulations must be
reported to NMED within_____________________________________hours: 48
7.MCL for Total Trihalomethanes______________mg/l: 0.
8.SDWA sampling results must be reported to: New Mexico Enviroment Depart- ment (NMED)
9.Ground water systems must sample for inorganic chemicals every years: 3
10.The SDWA Compliance Cycle for Standardized Monitoring Rule consists of Compliance Periods: 3
11. 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?: 40
12.Action level for Lead mg/l: 0.
13. If Bacteriological retakes are done this month what is the minimum number of samples that
must be turned in next month?: 5
14.if a 3-log removal is required for Giardia Lamblia what percentage of organisms can
survive and still meet requirements: 0.
15.Primary Inorganic Contaminant poses an immediate health risk: Nitrates
16.The Presence of Nitrates in the bloodstream that reduces oxygen uptake that gives the skin a
blue tint: Blue Baby Syndrome
17.Primary Contaminant that shields harmful bacteria from disinfection processes: Turbidity
18.Device used to measure NTU's: Nephelometer
19.Turbidity is Measured with: Turbidimeter or Nephelometer
20.Chemical sampling results be kept________________years: 10
21.Bacteriological sampling results be kept_________________years: 5
22.Microorganisms whose presence in water indicates probable presence of pathogens.: Indicator
organism
23.White powder used to neutralize chlorine: Sodium Thiosulphate
24.To insure the water being sampled is from the main and not the customers plumbling: Flush line
25.Number is used to determine how many Bac-t samples must be taken: Peo- ple served
26.Minimum number of Bac-T samples required each month?: 1
27.Anytime the MCL is exceeded and fecal coliform positive results come back from any of the
samples: Non-acute violation
28.If retakes are required this month what is the minimum number of samples required next month:
29.Bacteria that are found only in surface water supplies: Cryptosporidium & Giardia
44.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.- : Chloramines
45.Found in bleach: Sodium Hypochlorite
46.Results in a free chlorine residual: Breakpoint chlorination
47.Formed when Chlorine reacts with water: Hypochlorus acid & Hydrochloric acid
48.Additional piece of equipment needed to feed liquefied chlorine gas from a ton cylinder:
Evaporator
49.To keep Chlorine cylinders from rupturing from gas expanding. Chlorine rooms be kept below
F degrees: 120
50.Keep the chlorine gas forming Chlorine Hydrate also know as "GREEN ICE". Chlorine room
be kept above F degrees?: 60
51.Prevent Chlorine cylinders from rupturing when gets too hot: Fusible Plugs
52.At what temperature does the designed fusible plugs melt?_______________________F: 157
53.Why is Fluoride added to drinking water?: Prevent tooth decay
54.Chemicals used as sources of fluoride: Sodium silicofluoride and hydrofluo- rosilic acid
55.Optimum concentration of fluoride in water. mg/l: 0.8 - 1.
56. Factor is used to determine the optimum dosage of fluoride: Air temperature
57.Liquid fluoride: Hydrofluorosilicic acid
58.If a system adds fluoride, fluoride testing should occur: Daily
59.Why is fluoride an Inorganic Primary Contaminant: Causes harder more brittle bones
60.Equipment used to feed liquid fluoride or liquid chlorine: Positive displace- ment diaphragm
metering pumps
61.Percentage unaccounted for water become excessive?: 10
by phone, dial 811.
79.Mineral Contaminants: Iron, Manganese, Carbon Dioxide, Hydro Sulfide
80.Turbidity Contaminants: Silt & Clay, Suspended Matter That will not readily settle
81.Most Turbidity carry a negative charge causing a electro-chemical repul- sion called: Zeta
Potential
82.Inorganic contaminants: Lead, Mercury, Nitrate, Nitrite, Selenium, Arsenic, Radionuclides
83.Organic contaminants: Pesticides, Herbicides, Synthetic Organic Chemicals, Volatile Organic
Chemicals
84.Microbiological contaminants: Bacteria, Virus & Protozoa
85.Radiological Contaminants: Natural or man made sources of Radiation
86.A physical & Chemical reaction occurring which results in the formation of insoluable solids
(Floc) which settles: Coagulation
87.Violations for Chemical/s Must be reported in___________________days: 7
88.Violations for Radiological must be reported in___________________hours: 48
89.Sanitary survey records must be kept_________________years: 10
90.Removal of taste and odor problems: Air stripping
91.Head loss for a Rapid sand Filter should not be more than______________________feet: 8
92.Rapid sand filter run time should not exceed___________________hours: 100
93.Determines what water level that is required for water treatment operator-
: Population
94.Chlorine gas flexible feed tubes should be replaced every______________________months: 6
95.Flash mixers detention time be minutes or 5 to 7 feet per second: 1 - 3
96.Low voltage current through the water in a storage tank which concen- trates corrosion on
the sacrificial anode: Cathodic protection
97.Main operating unit in a centrifugal pump: Impeller
98.An attachment to the well casing to provide a sanitary seal between the well casing and the
effluent line: Pitless adapter
99.Height a centrifugal pump can theoretically push water______________________feet: 33.
100. Scale forming substance in water: Calcium carbonate
101. Nuetral pH: 7
102._________________________________________________Minimum velocity to flush
distribution system.__________________________________________fps: 2.
103.______________________________________________________________Regulation
minimum design pressure in distribution system._________________________________psi: 30
104. Physical link between a potable water system and one of unknown qual- ity: Cross
connection
105. DPD test is for: Chlorine analysis
106. Protects against backsiphonage and backflow: Reduced pressure zone assembly
107. Should be representative of the system: Bacti samples
108. Hours to analyze bacti samples.: 30
109. Positive bacti resampling must take place: Original location, one upstream and one
downstream
125. Disinfection by-products samples are taken from?: Distribution system
126. Lead and copper samples are taken from?: Point of use sites draw directly from
customers plumbing fixtures
127. Lead and copper samples are taken after water has not been in use for
hours: 6 - 8
128. Why must Drinking water distribution system sampling plans be de- veloped: Make sure
samples are taken from the appropriate locations within the system
129. May require moving locations each month in order to properly cover the entire system over
time: Microbiological samples
130. Commonly found in the environment (soil, vegetation) and are generally harmless:
Coliform bacteria
131. What are the 3 parts of a site sampling plan: Microbiological samples, disinfection
by-products samples, lead and copper samples
132. Drinking water distribution system sampling plans must be reviewed and approved by?:
NMED-DWB
133. What type of sample is a lead and copper sample: POU
134. The only reusable sample bottles: Nalgene
135. Found in the intestinal tract of warm blooded animals and humans: Col- iform bacteria
136. These bottles are clear plastic disposable container that are supplied by the manufacturer
with the colilert testing kits: IDEXX
137. If coliform bacteria are
present in the water supply may be present: -
Pathogens
138. 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: Snap Lid bottle
139. Never use a kitchen sink faucet that swivels or and outdoor
faucet that drips when selecting a : Sampling point
140. You should flush the line minutes or until the
temperature changes before taking a sample: 3 - 5
141. How many mL for a chlorine sample: 5
142. how many mL for a pH sample: 10
143. Hold the bottle at a degree angle while filling it: 45
144. Samples must be refrigerated at degrees
Fahrenheit: 39
145. When would you collect microbiological samples for reasons other than monitoring
compliance: New & repaired water lines or wells that have been disinfected
146. When
collecting microbiological samples for reasons other than mon- itoring compliance such as new water lines You would check on the form: Special sample
147. It is important to take compliance sample at the beginning of the week incase: Repeat
samples are needed
148.______________________________________________Radiological violation records
must be kept_____________________________________________years.: 10
150. All vents and overflows on a storage tank should be: Screened
151. If a single chlorine cylinder freezes: Feed Rate is too high
152. Prevents water passing from the high pressure side back to the suction side and
recirculate through the impeller again.: Wear rings
153. What would a dial indicator be used for: Measuring shaft misalignment
154. Connect a motor to a pump using: Coupling
155. A good application for a peristaltic pump: Chemical feed pump
156. Component in a diaphragm pump causes the most maintenance prob- lems: Check
valves
157. Can be used as an initial check of coupling alignment: Straight edge
158. The distance from the well to the edge of the cone of depression: Radius of influence
159. If the drawdown increases: Screen is becoming clogged
160. Type of algae will cause problems by clogging the filter bed: Diatoms
161. Chemical used to kill algae in a lake: Copper sulphate
162. Ladders must extend at least feet above the
trench?: 3
163. Chlorine is times heavier than water: 1.
164. Gate valves have turns per inch: 3
165. Average detention time for flocculation process in minutes: 30 - 60
166. Detention time in rapid mix process in minutes: 1 - 3
167. T
runk line in a large municipal should have a isolation valve every feet: 300 - 600
168. If a excavation is over feet deep shoring may be needed if
there isn't enough space to adequately slope a trench.: 5
169. A excavation over feet deep must have a ladder for access: 4
170. Ladders in a trench must
be located no more than feet from workers- : 25
