What’s another name for water hammer?
Hydraulic transient
What are the 4 backflow prevention devices?
Air gap, Reduced pressure Principle (RPP), Double Check Valve, Vacuum Breaker.
How do you determine air gap in backflow?
2 x the pipe diameter, at least 1 inch
What’s the difference between an RPP and a double check valve?
The DCV doesn’t have a relief valve
What does a vacuum protect, and not protect against?
Protects against backsiphonage but not back pressure.
What year was the safe water drinking act passed
1974
What is a public water system defined as?
At least 15 connections or serve 25 people a day for 60 days per year
What are the 3 public notifications times?
24 hours, 30 days, and within 1 year
What is required
What is required if more than 5% of samples are coliform positive?
A level 1 assessment
What must happen if a utility incurs an e.coli violation?
Level 2 assessment
The distribution residual cannot fall below 0.2 mg/L beyond this amount of time
4 hours
DBP MCL & MRDL were set under what legislation?
Disinfectants and disinfection by-products rule Stage 1
Monitoring of THM and Halo acetic acids were set under what legislation?
DDBP rule Stage 2
Trihalomethane MCL
0.08 mg/L
Haloacetic Acid MCL
0.06 mg/L
MRDL for Chlorine Dioxide
0.8 mg/L
