Chapter 4 Flashcards
Pathogens are disease causing ________
Microorganisms
Pathogens and diseases found in water are called _________
Water-borne
If fecal waste from an infected person gets into a water supply, the illness ( can or cannot ) be transmitted to a healthy person
Can
A waterborne disease that threatens humans is ________
Typhoid
A certain group of bacteria is used to indicate the possible presence of a pathogen is the __________ group
Total Coliform
The presence of fecal coliform in a water sample indicates fecal contamination from a _______or ________
Human / warm blooded animal
The term _______ _________means fecal and non fecal coliform
Total Coliform
Samples must be taken in sterile containers containg sodium thiosulfate which sequesters ________in the water
Chlorine
The purpose of the sample site plan is to assure bacteriological samples are collected from _______service connections which are representative of the distribution system.
Active.
When selecting a sample site, choose a non leaking faucet at least 18” above the ground and made of material that can be heated or withstand a chlorine solution or alcohol( true or false )
True
If there is no chlorine _____at a faucet, do not sample, flush longer
Residual
Bleach or alcohol requires _____ contact time than flaming to disinfect a faucet. ( less or more )
More
Fill the Sample container completely full of water to be analyzed ( true or false )
False
The required routine monthly bacteriological Sample must be marked ________
Distribution
Fill out the submission form completely or possibly lose credit for the sample ( true or false )
True
Get the sample to the lab within _____or it will be rejected.
30 Hours
Keep the sample in ice or in a cooler prior to and during lab transport because heat stimulates bacterial growth ( true or false)
True
A possible cause of bad Samples can be _________
Improper Flushing
If a routine sample is positive, flush the positive sample point, check the chlorine residual, then re sample within ____ of notification
24 Hours
Repeat samples must be taken at the _________within 5 connections upstream and within 5 connections down stream
Positive Point
Collect all repeat samples on _____day
Same
In the event of distribution pressure below ______psi, ______ outages, repeated bad samples or chlorine ______below minimum, special precautions must be instituted
20 / water / residual
One by-product of chlorinated drinking water is _______, a suspected carcinogen when consumed in water over a lifetime
Trihalomethane
To prevent the formation of THMS in surface water, chlorine is combined with ________forming chloramine , combined chlorine residual
Ammonia
The primary limits refer to chemicals with maximum containment levels that ______ be exceeded ( Can or cannot )
Cannot
At 0.8 to 1.0mg/l, fluoride reduces dental cavities, but in higher dosages >2.0mg/l can cause _______ of teeth over time
Mottling
High nitrate or nitrite levels put infants at risk of ______ syndrome
Blue Baby
Low doses of heavy metals such as lead and copper can cause damage to the central nervous system over time ( true or false )
True
The action level for lead is ______mg/l and for copper it is _____mg/l
.015 / 1.3
