NM WATER LEVEL 4 EXAM #2
QUESTIONS AND ACCURATE
ANSWERS
In00a00water00plant00that00uses00Coagulation,00Sedimentation,00and00Filtration00to00treat00the0
0water.00Which00of00the00following00Chlorine00application00points00would00you00have00the00lo
west00potential00for00generating00THM's?00-00ans-In00the00finished00water00clear00well
You00recently00heard00an00operator00explaining00that00the00under00drains00at00the00treatment0
0plant00were00not00working.00What00treatment00unit00was00the00operator00talking00about?00-
00ans-Gravity00Filter
Calculate00the00average00detention00time00in00a00rectangular00basin00that00is0090ft00long00by00
40ft00long00of00water00depth00of0015ft00.00When00the00flow00rate00is00200MGD00?00-00ans-200Days
A00new0010"in00water00main00264000ft00long00is00to00be00disinfected00by00applying006000mg/
l00of00Chlorine00and00allowing00it00to00stand00for002400hours.00How00many00pounds00of00dry00hy
pochlorite0065%00chlorine00will00be00needed?00-00ans-8.3
When00you00are00using00a00non00exchanged00softening00such00as00Zeolite00are00known00as?
00-00ans-Resins
What00is00the00acceptable00range00of00accuracy00for00small00residential00water00meters?00-
00ans-98.5%00to00101%
What00does00the00term00GAC00refer00to?00-00ans-Granulated00Active00Carbon
What00is00indicated00by00the00presence00of00fecal00coliform00or00non00coliform00in00a00water00s
ample?00-00ans-Contamination00by00animals00or00humans
How00does00organic00matter00increase00the00chlorine00demand?00-00ans-
It00combines00with00chlorine00to00form00less00affective00disinfectants
A00water00main00break00has00lowered00the00water00pressure00in00a00section00of00the00distributi
on00system.00What00is00one00possible00result00of00this00low00pressure?00-00ans-
Contamination
An00airline00200ft00long00is00situated00inside00a00well00for00determining00the00water00level.00Air0
0is00pumped00into00the00airline00and00the00pressure00gauge00is00stabilized00at003600psi.00What0
0is00the00water00level00in00the00well00in00feet00?00-00ans-11700ft
, Coliform00bacteria00must00be00tested00for00in00accordance00with00the00NMED00drinking00wate
r00regulations.00What00are00coliform00bacteria?00-00ans-Indicator00Organisms
What00affect00will00the00addiction00of00chlorine00gas00have00on00the00PH00of00the00water00?00-
00ans-Lower
A00near001000ft00long00___00inch00diameter00PVC00pipeline00is00to00be00installed00in00a00rocky0
0area.00A0024"00in00wide00trench00was00excavated00to00a00depth00of004ft.00How00many00cubic00y
ards00of00bedding00sand00will00be00required00to00provide00sand00encasement00around00the00pi
pe00for00a00total00depth00of0024"00inches00,00assuming0012"00inches00of00bedding00is00to00be00re
placed00below00the00pipe?00-00ans-13500cubic00yards
What00is00the00amperometric00nitration00used00to00measure?00-00ans-Chlorine00residual
What00is00the00purpose00of00an00air00relief00valve00on00a00pump?00-00ans-
Prevent00Air00Locking
What00is00the00MCL00for00Arsenic00in00mg/l?00-00ans-0.0100mg/l
Which00of00the00following00substances00combines00with00Magnesium00to00give00a00laxative00
affect00to00the00water00?00-00ans-Sulphates
You00are00the00operator00of00a00community00water00system00located00in00anywhere00New00M
exico,00anywhere00is00required00to00collect00a00minimum00of00three00compliance00samples00p
er00month00for00a00Total00Coliform00analysis.00In00April00one00of00Anywhere's00water00system0
0samples00reported00as00Total00Coliform00positive00all00repeat00samples00collected,00were00r
eported00Total00Coliform00negative.00During00May00the00anywhere00water00system00reported
00a00routine00sample00as00total00Coliform00positive.00One00of00the00May00repeat.00Samples00re
ported00as00fecal00chloroform00positive.00Which00of00the00following00statements00is00correct?
00-00ans-This00is00an00acute00MCL00violation00and00public00notification00is00required
In00the00situation00described00in00the00preceding00questions,00how00many00BACT00complianc
e00samples00must00be00collected00by00the00Anywhere00water00system00in00June?00-00ans-5
An00operator00has00discovered00that00a00log00has00been00cut00from00the00hatch00of00a00distribu
tion00system00storage00tank.00Until00the00incident00is00confirmed,00treat00this00type00of00securit
y00breach00as?00-00ans-A00potential00contamination00threat
If00an00insufficient00amount00of00chlorine00is00used00for00disinfection.00The00total00chlorine00re
sidual00may00be00made00of00up00combined00chlorine00residual00causing00a00problem00with00ta
ste00and00order.00What00causes00this00problem?00-00ans-
Deconstruction00of00chlorine00compounds
What00does00a00reduction00in00specific00capacity00indicate?00-00ans-Pumping00cost00increase
QUESTIONS AND ACCURATE
ANSWERS
In00a00water00plant00that00uses00Coagulation,00Sedimentation,00and00Filtration00to00treat00the0
0water.00Which00of00the00following00Chlorine00application00points00would00you00have00the00lo
west00potential00for00generating00THM's?00-00ans-In00the00finished00water00clear00well
You00recently00heard00an00operator00explaining00that00the00under00drains00at00the00treatment0
0plant00were00not00working.00What00treatment00unit00was00the00operator00talking00about?00-
00ans-Gravity00Filter
Calculate00the00average00detention00time00in00a00rectangular00basin00that00is0090ft00long00by00
40ft00long00of00water00depth00of0015ft00.00When00the00flow00rate00is00200MGD00?00-00ans-200Days
A00new0010"in00water00main00264000ft00long00is00to00be00disinfected00by00applying006000mg/
l00of00Chlorine00and00allowing00it00to00stand00for002400hours.00How00many00pounds00of00dry00hy
pochlorite0065%00chlorine00will00be00needed?00-00ans-8.3
When00you00are00using00a00non00exchanged00softening00such00as00Zeolite00are00known00as?
00-00ans-Resins
What00is00the00acceptable00range00of00accuracy00for00small00residential00water00meters?00-
00ans-98.5%00to00101%
What00does00the00term00GAC00refer00to?00-00ans-Granulated00Active00Carbon
What00is00indicated00by00the00presence00of00fecal00coliform00or00non00coliform00in00a00water00s
ample?00-00ans-Contamination00by00animals00or00humans
How00does00organic00matter00increase00the00chlorine00demand?00-00ans-
It00combines00with00chlorine00to00form00less00affective00disinfectants
A00water00main00break00has00lowered00the00water00pressure00in00a00section00of00the00distributi
on00system.00What00is00one00possible00result00of00this00low00pressure?00-00ans-
Contamination
An00airline00200ft00long00is00situated00inside00a00well00for00determining00the00water00level.00Air0
0is00pumped00into00the00airline00and00the00pressure00gauge00is00stabilized00at003600psi.00What0
0is00the00water00level00in00the00well00in00feet00?00-00ans-11700ft
, Coliform00bacteria00must00be00tested00for00in00accordance00with00the00NMED00drinking00wate
r00regulations.00What00are00coliform00bacteria?00-00ans-Indicator00Organisms
What00affect00will00the00addiction00of00chlorine00gas00have00on00the00PH00of00the00water00?00-
00ans-Lower
A00near001000ft00long00___00inch00diameter00PVC00pipeline00is00to00be00installed00in00a00rocky0
0area.00A0024"00in00wide00trench00was00excavated00to00a00depth00of004ft.00How00many00cubic00y
ards00of00bedding00sand00will00be00required00to00provide00sand00encasement00around00the00pi
pe00for00a00total00depth00of0024"00inches00,00assuming0012"00inches00of00bedding00is00to00be00re
placed00below00the00pipe?00-00ans-13500cubic00yards
What00is00the00amperometric00nitration00used00to00measure?00-00ans-Chlorine00residual
What00is00the00purpose00of00an00air00relief00valve00on00a00pump?00-00ans-
Prevent00Air00Locking
What00is00the00MCL00for00Arsenic00in00mg/l?00-00ans-0.0100mg/l
Which00of00the00following00substances00combines00with00Magnesium00to00give00a00laxative00
affect00to00the00water00?00-00ans-Sulphates
You00are00the00operator00of00a00community00water00system00located00in00anywhere00New00M
exico,00anywhere00is00required00to00collect00a00minimum00of00three00compliance00samples00p
er00month00for00a00Total00Coliform00analysis.00In00April00one00of00Anywhere's00water00system0
0samples00reported00as00Total00Coliform00positive00all00repeat00samples00collected,00were00r
eported00Total00Coliform00negative.00During00May00the00anywhere00water00system00reported
00a00routine00sample00as00total00Coliform00positive.00One00of00the00May00repeat.00Samples00re
ported00as00fecal00chloroform00positive.00Which00of00the00following00statements00is00correct?
00-00ans-This00is00an00acute00MCL00violation00and00public00notification00is00required
In00the00situation00described00in00the00preceding00questions,00how00many00BACT00complianc
e00samples00must00be00collected00by00the00Anywhere00water00system00in00June?00-00ans-5
An00operator00has00discovered00that00a00log00has00been00cut00from00the00hatch00of00a00distribu
tion00system00storage00tank.00Until00the00incident00is00confirmed,00treat00this00type00of00securit
y00breach00as?00-00ans-A00potential00contamination00threat
If00an00insufficient00amount00of00chlorine00is00used00for00disinfection.00The00total00chlorine00re
sidual00may00be00made00of00up00combined00chlorine00residual00causing00a00problem00with00ta
ste00and00order.00What00causes00this00problem?00-00ans-
Deconstruction00of00chlorine00compounds
What00does00a00reduction00in00specific00capacity00indicate?00-00ans-Pumping00cost00increase