PMT 108 TEST 3 PREPARATION
QUESTIONS AND ANSWERS
(GRADED A+)
Bacterial pollution - Answer- Coliforms and fecal streptococci are used as indicators of
possible sewage contamination because they are commonly found in human and
animal feces
Purification zones
Zone of pollution - Answer- Carbonaceous matter is oxidize
Immediate increase in biochemical oxygen demand determination
Immediate increase in oxygen
Purification zones
Zone of degradation - Answer- Pollution recently introduced
High turbidity
Dissolved oxygen reduced to less than half
Worms snails and sewage fungi increase
Fish life is coarse
Algae and fish life decline
Purification zones
Zone of active decomposition - Answer- Waste products are decomposed and
consumed by larger organisms to sustain life
Low DO
Scum floating
Water is darker and grayish
No fish present
Anaerobes predominate
Purification zones
Zone of recovery - Answer- Point where water quality gradually returns to its biological
and physical state prior to discharge
Turbidity decreases
DO gradually increase
No odors
Algae reappear
Carp reappears
Purification zones
Zone of cleaner water - Answer- Stream has returned to its original state
, Clean water
DO approaches saturation
Natural stream conditions restored
Normal plant and animal life
Game fish appear
Purification Zones in a Stream (5) - Answer- Pollution
Degradation
Decomposition
Recovery
Cleaner water
Dissolved Oxygen (DO) - Answer- the amount of oxygen in the water
Important indicator of waters ability to support aquatic life
Grab sampling - Answer- Single sample of water taken at any one designated time
Taken at specific point in stream
Composite sampling - Answer- Collected by mixing together samples that have been
collected at regular intervals (1 hour) over 24 hour period
Take every one hour
Store at 4 degrees or below
Same criteria for grab
Biochemical Oxygen Demand (BOD) - Answer- Determines the amount of relative
oxygen requirements of wastewater's, effluents, and polluted waters
Measure DO before and incubation
Computed from difference between initial and final DO
DO Samples
If analysis is not started within....hours keep samples at or below 4 c.
Begin analysis withij...hours of collection
In no case, start analysis after more than...hours - Answer- 2 hours
6 hours
24 hours
Following laws/regulations apply to water point recon - Answer- National pollution
discharge elimination system
AR 40-5
AR 200-1
FM 10-52-1
MCWP 4-11.6
Tb med 577/navmed p-5010-10/Afman 48-138_Ip
Water point recon responsibilities
QUESTIONS AND ANSWERS
(GRADED A+)
Bacterial pollution - Answer- Coliforms and fecal streptococci are used as indicators of
possible sewage contamination because they are commonly found in human and
animal feces
Purification zones
Zone of pollution - Answer- Carbonaceous matter is oxidize
Immediate increase in biochemical oxygen demand determination
Immediate increase in oxygen
Purification zones
Zone of degradation - Answer- Pollution recently introduced
High turbidity
Dissolved oxygen reduced to less than half
Worms snails and sewage fungi increase
Fish life is coarse
Algae and fish life decline
Purification zones
Zone of active decomposition - Answer- Waste products are decomposed and
consumed by larger organisms to sustain life
Low DO
Scum floating
Water is darker and grayish
No fish present
Anaerobes predominate
Purification zones
Zone of recovery - Answer- Point where water quality gradually returns to its biological
and physical state prior to discharge
Turbidity decreases
DO gradually increase
No odors
Algae reappear
Carp reappears
Purification zones
Zone of cleaner water - Answer- Stream has returned to its original state
, Clean water
DO approaches saturation
Natural stream conditions restored
Normal plant and animal life
Game fish appear
Purification Zones in a Stream (5) - Answer- Pollution
Degradation
Decomposition
Recovery
Cleaner water
Dissolved Oxygen (DO) - Answer- the amount of oxygen in the water
Important indicator of waters ability to support aquatic life
Grab sampling - Answer- Single sample of water taken at any one designated time
Taken at specific point in stream
Composite sampling - Answer- Collected by mixing together samples that have been
collected at regular intervals (1 hour) over 24 hour period
Take every one hour
Store at 4 degrees or below
Same criteria for grab
Biochemical Oxygen Demand (BOD) - Answer- Determines the amount of relative
oxygen requirements of wastewater's, effluents, and polluted waters
Measure DO before and incubation
Computed from difference between initial and final DO
DO Samples
If analysis is not started within....hours keep samples at or below 4 c.
Begin analysis withij...hours of collection
In no case, start analysis after more than...hours - Answer- 2 hours
6 hours
24 hours
Following laws/regulations apply to water point recon - Answer- National pollution
discharge elimination system
AR 40-5
AR 200-1
FM 10-52-1
MCWP 4-11.6
Tb med 577/navmed p-5010-10/Afman 48-138_Ip
Water point recon responsibilities
