Book practice Flashcards
1
Q
which of the following is removed at the raw water intake?
A
Fish and debris
2
Q
which of the following is more likely to be found in groundwater?
A
minerals
3
Q
what is most commonly used to control algae growth in reservoirs?
A
copper sulfate
4
Q
what are common filtration rates in gravity filtration
A
2 to 10 GPM/sq.ft.
5
Q
leakage within a centrifugal pump is intended for what purpose?
A
cool moving parts
6
Q
which of the following is the definition of a grab sample?
A
a single sample of water collected at a particular time and place which represents the composition of the water only at that time and place
7
Q
adding sodium hypochlorite to water will have the following effect
A
increase pH
8
Q
what is the purpose of the groundwater rule
A
to protect the groundwater from disease-causing microorganisms
9
Q
what is true about the total coliform rule?
A
establishes an MCL based on the presence and absence of total coliforms or E.coli
10
Q
what will happen to the water quality if chlorine is injected at the same location as power activated carbon (PAC)
A
chlorine will react with carbon and neutralize the effects of both
11
Q
which of the following will react with chlorine to form trihalomethane
A
natural organic matter
12
Q
what type of pump has a piston within the casing?
A
reciprocating
13
Q
What must be located near a hazardous chemical storage room?
A
SDS
14
Q
What term describes the depression of a water table?
A
Cone of depression
15
Q
What is the radius of influence?
A
The radial distance from the center of a well bore to the point where there is no lowering of the water table
16
Q
What is the best way to monitor filter performance ?
A
Turbidity
17
Q
What causes the water to look cloudy?
A
Suspended material
18
Q
Which chemical is sprayed near a chlorine gas leak to produce white smoke?
A
Ammonia
19
Q
Which water sample parameters must be taken in the field?
A
pH and temperature
20
Q
If the total coliform tests positive, then what must be done next?
A
Test for fecal coliform
21
Q
What is performed to evaluate susceptibility to potential threats and identify corrective actions that can reduce or mitigate the risk for a water system?
A
Vulnerability assessment
22
Q
What is the definition of holding time for water samples?
A
The length of time a water sample is retained between taking the sample and laboratory analysis
23
Q
From a bacteriological standpoint, what is important for a well?
A
Protect it from contaminated runoff
24
Q
Which is true of chlorine gas?
A
It is 2.5 times heavier than air
25
What happens after breakpoint chlorination is achieved?
Chlorine dose and residual increases at the same rate
26
If chlorine residual is not detected after 3 mg/l of dosage is applied, then what might be occurring in the water?
Demand has not been met
27
Which of the following is an indicator organisms for pathogens?
Coliform
28
what would happen if there is an increase in turbidity, organics, and manganese in the water?
increase in chlorine demand
29
which of the following would increase alkalinity in the water?
CaC03
30
If you dropped the lid of a sample bottle prior to sampling, what should you do?
Use a new container
31
What is the purpose of the lantern ring in a centrifugal pump?
provide lubrication and cooling
32
What is the definition of well draw down?
distance between static and pumping water level
33
what should be done with a water sample that cannot be analyzed in a timley manner?
refrigerate it
34
which of the following source water would most likely contain cryptosporidium and giardia
stream
35
what is the purpose of chlorine residual
provides a safeguard to kill additional microorganism encountered after treatment
36
which of the following is equivalent to 3 log removal
99.9%
37
how is turbidity measured
nephelometric
38
which chemical is used to dechlorinate water?
sodium thiosulfate
39
what must you wear prior to being exposed to chlorine gas?
Self-contained breathing apparatus
40
what is the minimum chlorine concentration required prior to introducing the effluent from a surface water filtration plant to the distribution system
0.2ppm
41
which of the following best describes a water table?
upper water surface of an aquifer
42
the total coliform rule applies to which of the following water systems?
all public water systems
43
what is the purpose of a shaft sleeve in a pump
protects shaft from wear at stuffing box
44
why isnt chlorine injected immediately prior to filtarion
increases THMs
45
which of the following is a disinfection by-product
trihalomethane
46
which of the following is used to describe a well that is under pressure
artesian well
47
what would cause high concentration of nitrate in groundwater
over-fertilization of land
48
what is the purpose of the lead and copper rule
protect the public health by minimizing lead and copper in drinking water primarily by reducing water corrosivity
49
which of the following is not affected by chlorine dose?
hardness
50
how long should you run the water before you grab a water sample
2 to 3 minutes
51
which of the following is a typical form of calcium hypochlorite?
65% solid tablet
52
frosting around the outlet connection of a chlorine gas cylinder indicates which of the following
reduce flow of chlorine gas
53
which of the following describes trickling of water from the ground surface towards the aquifer
percolation
54
what is a likely discharge of industrial waste found in surface water
organic solvents
55
why shouldn't you have zero pressure in a water main
back siphonage may contaminate the water main
56
what should be inside a sample bottle when obtaining a sample for a coliform test
sodium thiosulfate
57
if the MCL for a constituent is violated, who is responsible for notifying the customers about this?
water purveyor
58
what is the typical concentration of sodium hypochlorite
12.5%
59
if 2.5mg/l of chlorine is dosed, and there is 0.5mg/l of residual, what is the reason for the residual
the residual is present as a safeguard for unanticipated chlorine demand in the distribution system
60
which of the following must always be done before repairing a pump
lock out equipment
61
which of the following is least likely to affect the effectiveness of chlorine
sodium
62
which of the following is considered safe to drink
no pathogens
63
which reading must be taken in the field when obtaining a sample
chlorine residual
64
which of the following devices will give you the hydrogen ion concentraion
pH meter
65
which of the following is the correct laboratory procedure?
add acid to water
66
when dealing with a high pressure pipeline, which must you do?
open and close a valve slowly
67
which of the following water source is more likely to have iron and manganese
groundwater
68
which will affect chlorine demand the most
turbidity and organics
69
which will make chlorine more effective in water?
moderate increase in temperature
70
what are colloidal particles ?
very small particles that do not dissolve and remain dispersed in a liquid for a long time due to their small size and electrical charge
71
what is alkalinity
the capacity of water to neutralize acid
72
what does MCL stand for
maximum contaminant level
73
what is in the zone of saturation
aquifer
74
what is a hydrologic cycle
continuous movement of water throughout the planet
75
what typically occurs at the beginning of breakpoint chlorination curve
chlorine destroyed by reducing compounds
76
what is the drawback of pre-chlorination
formation of THMs
77
how long should the tap remain turned off before grabbing a sample for a lead and copper test
6 hours
78
the secondary MCL is set for what purpose?
aesthetic
79
which of the following will lead to an illness
nitrate
80
what is the most likely cause of decreasing chlorine residual in the water main?
Bacteria and organics may be present
81
what is the aquifer typically composed of?
sand and gravel
82
what is used to lower pH in water
CO2
83
what is the maximum allowable chlorine residual concentration in the distribution main
4mg/l
84
why is trihalomethane considered to be harmful
it is a carcinogen
85
which of the following describes turbidity
cloudiness or haziness of a fluid caused by suspended solids
86
what is a pathogen
disease causing microorganism
87
what is the impact of algae to water quality
taste and odor problems
88
what is the concentration of chlorine gas
100%
89
which of the following is not used to mix coagulants
horizontal paddle wheel
90
what is considered to be a quick remedy to address a sudden increase in filtered water turbidity
feed a filter-aid chemical to filter the filter influent
91
what is the likely cause of a pinging noise in a pump
cavitation
92
which of the following controls the efficiency of removing suspended solids in the sedimentation process
flowrate
93
what is a sanitary survey
an analysis to determine all potential water quality impacts to a proposed well
94
which of the following categories does bacteria belong to
colloidal
95
under the surface water treatment rule, what must the reduction of viruses be through filtration and disinfection?
99.99%
96
which of the following is not considered free residual chlorine?
monochloramine
97
why is coliform used as an indicator organism
it reduces the complexity and cost of analysis
98
what is an example of a non-community, non-transient water system?
school
99
what is the purpose of a packing in a pump?
control the leakage of water along the pump shaft and prevent air from entering along the shaft when the pump is in a suction lift condition
100
what does the addition of carbon dioxide do to the pH of water?
lowers it
101
what is an unconfined aquifer
one in which groundwater possesses a free surface open to atmospher
102
what is static water level in a well
water level when pump is not runnning
103
which of the following will least likely impact the formation of flocs during the coagulation and focculation process
hardness
104
what is formed when free chlorine reacts with ammonia
chloramine
105
which contaminant causes blue baby syndrome
nitrate
106
what is free chlorine
the concentration of residual chlorine in water which is present as dissolved gas, hypochlorous acid, and hypochlorite ion
107
what is a thermocline
a thin but distinct layer in a reservoir in which temperature changes more rapidly with depth that it does in the layers above or below
108
what agency protects the health and safety of industrial employees
OSHA
109
what is the first priority in water treatment?
production of safe drinking water
110
what is the health effect of consuming water with high levels of lead
cardiovascular effects, increased blood pressure and incidence of hypertension
111
what is an imaginary surface to which groundwater rises under hydrostatic pressure in wells or springs?
piezometric surace
112
what is used to evaluate new coagulants or polymers being considered for use at the plant
Jar test
113
what are the 4 zones of a clarifier
inlet,outlet,settling,sludge
114
which type of filtration process is approved by the surface water treatment rule?
conventional water treament
115
which of the following impacts the color of source water
organics,such as soil and leaves
116
coliform is most likely to be found in which of the following water supply
lake
117
what is the amount of water that can be withdrawn from an aquifer without significant environmental impact
safe yield
118
pH will increase if the following chemical is added to water
ammonia
119
which of the following is an unstable form of disinfection
ozonation
120
how many stages are in a breakpoint chlorination curve
4
121
chlorine demand is best describes which of the following
chlorine dose - residual
122
what is an example of natural organic matter
fallen leaves
123
what is a typical characteristic of a colloidal particle in raw water?
negative charge on the surface
124
what is short circuiting in a claifer
shorter settling time in basin
125
what would cause a filter to begin backwashing
headloss
126
what is the purpose of surface washing in a filtration unit
break-up mudballs
127
where would you most likely see high levels of nitrate in the groundwater supply?
near agricultural land
128
what is adsorption
constituents sticking to the surface of a subtance
129
in which part of the water treatment plant are 99% of the suspended solids removed
sedimentation and filtration
130
which of the following will most likely lead to the lowest concentration of THMs in treated water
chloramines
131
which of the following is not true about the total colifrom rule
smaller systems that collect fewer that 40 samples cannot have coliform positive results in more than 2 samples per month
132
which of the following is true about fusible plugs on a chlorine container?
never remove it
133
what is the most common water quality complaint from customers?
taste and odor problems
134
what information should be identified on the sampling container?
sampling location, date and time
135
what is the standard requirement for conventional and direct filtration
filtered water must be less than or equal to 0.3 NTU in 95% of monthly measurements
136
what is the main drawback of using sodium hypochlorite to disinfect water
formation of THMs
137
what is one of the causes of hardness in water?
calcium
138
which chemical is used to raise the pH in water
soda ash
139
what is the purpose of flocculation
slowly stir water to bring smaller flocs together to form larger ones
140
which of the following range of pH is considered to be acidic?
0-6
141
what is the term used to describe the upper layer of a stratified reservoir?
epilimnion
142
what is another name for the multiple tube fermentation test
MPN
143
what impact does precipitated manganese have on water?
blackish water
144
which of the following is not part of the surface water treatment rule
all water systems are allowed to use disinfection only for surface water sources that meet criteria for water quality and watershed protection
145
what is a typical characteristic of chlorine gas
greenish yellow color
146
which of the following is not true about the total coliform rule
monthly sampling requirements are not based on population served
147
what can be done to minimize the formation of THM
eliminate or reduce chlorination before the filters
148
what is the source of fecal coliform bacteria
feces
149
what is the drawback of using UV for disinfection
high energy cost
150
what are the two types of aquifers
confined and unconfined
151
what is a common problem associated with hardness in water
scaling
152
what is the problem with very soft water
corrosion
153
why is it harmful to backwash at a high velocity
flushes some media into spent backwash water
154
what occurs on the right side of the breakpoint chlorination curve
free available residual chlorine begin to form
155
how does PAC remove contaminants from the water
adsorption
156
which entity is responsible for enforcing the drinking water standards
state
157
how is the rate of head loss affected by a more uniform filter media
slower
158
which of the following is true about soluble iron and manganese
colorless
159
what is the reason for adding coagulants at the flash mixer
neutralize negative charge of colloids
160
why would a water purveyor switch from chlorine gas to sodium hypochlorite
safety
161
which pathogen is smallest in size
virus
162
which of the following is not an example of a suspended solid
soluble calcium
163
which of the following is not a type of coliform test
DPD
164
what is the definition of a public water system
publicly or privately owned water system that has at least 15 service connections, or regularly serves an average of at least 25 people daily at least 60 days per year
165
when is brilliant green bile used to test for coliform
multiple tube fermentation method
166
which of the following is the correct order of treatment for a conventional water treatment plant
intake, coagulation, flocculation, sedimentation, filtration, disinfection
167
what might happen if insufficient amount of coagulants were injected into the flash mixer
some colloids may repel each other
168
which of the following is a grab sample
sample taken on a one time biases without consideration of flow or time
169
what happens over the course of a filter run time
headloss increases
170
when is direct filtration used instead of conventional water treatment
when source water is low in turbidity, color, and odor
171
what is the criteria for a community water system?
has at least 15 service connections used by all-year residents, or regularly serves at least 25 all-year residents
172
what is the acceptable limit of copper in drinking water
1.3 mg/l
173
which type of reservoir is rich in nutrients
eutrophic
174
what is a mechanical seal
metallic flat surfaces used to minimize leakage around the pump shaft
175
what is a confined aquifer
an aquifer that is bounded above and below by confining beds
176
which of the following best describes pumping water level in a well?
upper surface of the groundwater that is being pumped
177
what is the name of the deepest layer of a reservoir under thermal stratifation
hypolimnion
178
what is the health effect of consuming water with high levels of copper
stomach and intestinal distress such as nausea, vomiting, diarrhea and stomach cramps
179
which of the following best describes a turbine pump
a centrifugal pump that is mainly used to pump water from wells
180
what is typically used to clean the sludge n the bottom of a rectangular clarifer
chain and flight collectors
181
how often should preventative maintenance be performed on equipment
use manufacturer's recommendation
182
what is CT?
contact time x chlorine residual concentration
183
what is absorption
constituent is sucked in
184
what is the purpose of a check valve
allows water to flow in on direction, and prevents reverse flow
185
what would happen to the pH of water if lime is added?
increase pH
186
what is the term used to describe groundwater that flows naturally from the ground?
spring
187
once thermal stratification occurs in the middle and lower zones of a reservoir, what type of problem occurs in these layers?
depletion of total dissolved oxygen
188
what is the most critical problem that may be encountered when entering a confined space
oxygen deficiency and toxic gas
189
which of the following is a settleable solid
sand
190
which of the following is not a commonly used coagulant
sodium hypochlorite
191
what is the purpose of a coagulant aid
add density to slow settling flocs
192
which of the following is least likely to be removed in sedimentation process?
aqueous form of manganese
193
in the sedimentation process what would happen if the flowrate were increased
lower efficiency
194
if turbidity is rising rapidly, what should you do
verify the effectiveness of the coagulant chemicals and dosage at the flash mixer
195
the collection of a bad sample is useful as which of the following
no result
196
which of the following is not a mechanism that occurs in a filter media
precipation
197
which of the following is not a type of filter media used for gravity filtration
diatomaceous earth
198
what are the three types of media used in a multi-media filtration system
sand, anthracite coal, and slurry
199
what does the term "fluidized" mean in filtration?
filter media is expanded during backwash
200
which of the following is not an attribute of activated carbon
removed nitrate
201
how is the filtration efficiency evaluated
turbidity measurement
202
which of the following is not a way to address backwashing problems in a filter
adjust chemical injection rate
203
which of the following is a requirement of the surface water treatment rule
at least 99.9 % removal of giardia cysts
204
which of the following is not a process that will remove pathogens from water?
screening
205
which of the following will be formed when free chlorine combines with water
hypochlorous acid
206
which of the following is true about chlorine gas, by itself
nonflammable and nonexplosive
207
what is the most common source of waterborne disease outbreaks
backblow
208
why would a water utility switch from using sodium hypochlorite to chloramines
reduce formation of THMs
209
what is a CT value
a measure of the degree of pathogenic inactivation
210
when is a hypochlorinator typically used
to feed liquid chlorine
211
which contaminant should never be sampled using a composite sample
bacteria
212
if liquid chlorine is leaking from a cylinder, what should you do
turn the container so that the leak is on top
213
which of the following provides the most convenient and repeatable chlorine residual results
amperometric titration
214
which of the following does not have a primary MCL
iron
215
which of the following is not true about chlorine gas?
most people cannot detect chlorine gas at about 2ppm
216
what is the disadvantage of using ozone to disinfect water
cost
217
what is the most common technique used to control taste and odor?
PAC
218
what does an organic compound always contain
carbon
219
which of the following is a type of acid?
hydrochloric
220
select the answer that violates the basic rules of laboratory work
pipet hazardous materials with your mouth
221
which of the following is true regarding water sampling
collecting water samples at a water treatment plant is no different than collecting samples from a stream or river
222
what has a rotten egg smell
hydrogen sulfide
223
which total coliform bacteria test involved the use of lauryl tryptose broth
multiple tube fermentation method
224
how is alkalinity usually expressed
calcium carbonate equivalents
225
what does a pH of 2 represent?
strong acid
226
what impact does Total dissolved solids (TDS) have on water quality?
adverse taste
227
what is the optimum pHof water for disinfecting bacteria?
7.5
228
what is wire to wire efficiency
the combine efficiency of a pump and motor
229
select the answer that is not a type of positive displacement pump
centrifugal
230
which of the following rotates at high speed and imparts velocity to the water?
impelelr
231
what is the term used to describe a connection between a drinking water system and an unapproved water supply
cross connection
232
which is the term used to describe the shallow water of a reservoir with abundant plant growth
littoral zone
233
what impact does algal blooms have on the pH of a reservoir
increases pH
234
what type of charge would you expect to see on a coagulant
positive
235
what would cause excessive media to be in the spent backwash water
backwashing at high velocity
236
what safety equipment must be worn before entering a confined space
harness
237
what are the typical characteristics of the source water for a direct filtration plant
low turbidity level, less than 2 NTU
238
what is the purpose of the coagulation and focculation process
neutralize the negative charges on the colloids, and slowly stir water to create flocs
239
which of the following would not trigger a filtration system to backwash
temperature
240
what is the definition of disinfection
inactivation of most pathogens
241
which of the following is a secondary contaminant
manganese
242
what is the safety hazard of working with polymers
slippery floor
243
what is the disadvantage of using chloramines
weak disinfectant
244
what is the purpose of a dial indicator
measure shaft misalignment
245
what is an attribute of a diatomaceous earth filter
mesh screen is pre-coated with powdered media
246
which of the following is true about the presumptive test
it takes 48 hours to obtain results for the total coliform test
247
what is a cercinogen
causes cancer
248
what is the minimum required disinfection residual concentration leaving a surface water treatment plant
0.2 mg/l
249
which of the following is equal to 1ppm
1 mg/l
250
what is the disadvantage of using UV to disinfect water?
no disinfectant residual
251
what would most likely occur if a higher quantity of chlorine is added to water
more THMs will form
252
what is the most common error in water quality analysis
sampling
253
what is the term used to describe the introduction into water of microorganisms, chemicals, and toxic substances in a concentration that makes the water unfit for its next intended use?
contamination
254
which acid is formed when chlorine is mixed with water
hypochlorous acid
255
what is an example of a non-community, transiet water system
rest stop
256
what might occur after a filter has been backwashed?
turbidity momentarily increases in the filter effluent
257
what is the lowest reportable concentration for constituents called
detection level for reporting
258
which of the following is part of the multiple tube fermentation analysis
presumptive, confirmed, completed
259
what is 4 log removal
99.99%
260
what is considered to be a base
pH in the range of 8 to 14
261
what organisms use organic matter for energy and growth
heterotrophic
262
what organism is capable of causing diseases
pathogen
263
what is the term used to describe the removal or destruction of all microorganisms
sterilization
264
which process releases water vapor into the atmosphere by living plants
transpiration
265
what is the zone of saturation
the soil located below the top of the groundwater table
266
what is an example of combined chlorine
monochloramine
267
which of the following is a chlorine spill kit for a one-ton container
spill kit B
268
what is the purpose of pre-chlorination
to control taste
269
what should be used to convey chlorine gas out of a one-ton container
upper valve
270
what is typically the cause of tase and odor problems in raw surface water?
algae growth
271
what is the best pH for coagulation
5-7
272
what are the 4 zones of clarifer
inlet, outlet, settling, sludge
273
what is used to protect the underdrain in a filtration system
gravel
274
what is not a cause of a short filter run
low flow
275
what would not trigger a backwash in a filtration system
temperature
276
what is a breakthrough
a crack in the filter bed that allows flocs to pass thruogh
277
where should sodium hypochlorite be stored
away from anything that will corrode
278
what is the langeliers saturation index
an indicator of the corrosivity of water
279
which of the following is the most resistant to chemical disinfection
giardia cysts
280
what DBP would you expect to see in the water that is disinfected with ozonation
bromate
281
how long does it take to detect E.Coli using the colilert method
24 hours
282
which chemical is used to remove turbidity
alum
283
what is the main purpose of the surface water treatment rule
removal of pathogens
284
which layer of a stratified reservoir will most likely suffer from algae growth
eplilmnion
285
what are very small particles that do not dissolve
colloids
286
what is the typical source of lead and copper in drinking water
corrosion of service piper
287
which of the following lab equipment is the most accurate measuring device
pipet
288
what is the definition of operation ratio
ratio of annual operating expenses to operating revenue
289
what are the monthly sampling requirements based on
population served
290
which constituent causes hard water?
magnesium
291
when does chlorine and water reach breakpoint chlorination
when it stops reacting with organics and inorganics
292
what is the problem with soft water
corrosion
293
which of the following would be considered soft water
less than 60 mg/l CaCo3
294
which of the following is not used to treat hard water
carbon dioxide
295
what is another name for caustic soda
sodium hydroxide
296
if a significant amount of iron is present in water, what are the adverse impacts
taste and staining
297
what is the health impact of drinking water with excess lead
development problems in children
298
what is the impact of TDS on water
bad taste
299
which of the following technologies is the most effective way to remove TDS
reverse osmosis
300
what is an organic precursor
humic acid
301
what is the impact of overdosing potassium permanganate in water
pink water
302
where are samples for lead and copper typically obtained
consumers tap
303
which of the following is the most common way to test for e.coli
Colilert
304
which of the following is the best way to minimize THMs
dont prechlorinate
305
when must the public be notified of a tier 1 violation regarding their water supply
within 24 hours after occurrence of violation
306
what is titration
a process of adding the chemical reagent in small increments until completion of reaction
307
what is supernatant
the relatively clear water layer between the sludge on the bottom and the scum on the surface of a basin
308
which of the following contributes to alkalinity
bicarbonate
309
select the answer that is regulated under the secondary drinking water standards
odor
310
which of the following is a requirement for viruses under the surface water treatment rule?
99.99% removal and or inactivation
311
what is the process that transfers water vapor from living plants into atmosphere
evapotranspiration
312
when must a repeat sample be taken
sample tests positive for total colifrom
313
why is fluoride injected into drinking water
reduce tooth decay
314
which of the following is used to test chlorine residual in the field
DPD
315
what is the largest zone in a sedimentation tank
settling zone
316
which of the following describes the attributes of chlorine dioxide
it does not form carcinogenic compounds
317
what is a common source of coliform
feces
318
what is the hypogeal biological layer formed on the surface of a slow sand filter
schmutzdecke
319
which of the following would lead to thermal stratification
when surface water begin to warm
320
which of the following is true about using an inclined plate settler
uses a smaller footprint at the plant than a conventional clarifer
321
which of the following will most likely lead to nitrification
high concentration of ammonia in water
322
what is the probable cause of reddish brown water
iron
323
which constituent makes water appear black
manganese
324
which of the following is a potentially dangerous condition in a confined space
oxygen content drops below 19.5% by volume
325
which of the following is not true about tuberculation
increases pipe capacity
326
what is the secondary MCL
sets limits for constituents that affect the aesthetic qualities of drinking water
327
which of the following is a tier 1 violation
exceeding MCL for nitrate
328
what is used to control the injection of gas chlorine into water
chlorinator
329
which of the following is a venturi style injector used for chlorine gas
eductor
330
what would happen if a valve is closed to quickly
water hammer
331
when must a public notice be issued to the coustomers
when there is a serious problem with the drinking water
332
what would cause manganese to precipitate
adding sodium hypochlorite
333
what is the purpose of the total coliform rule
improve public health protection by reducing fecal pathogens to minimal levels
334
what typo of pump is used as a chemical metering pump
positive displacement pump
335
if you have rights to pull water out of an adjacent river due to the purchase of a land, which of the following rights do you have
riparian
336
which of the following is a typical characteristic of surface water
higher turbidity and organics
337
if groundwater near an ocean has high concentration of chlorides, which of the following may be true
seawater intrusion is occuring
338
which of the following is a thermocline
metalimnion
339
what is the purpose of the sanitary seal in a well
prevent contamination of groundwater supply
